It is a negative ion that has one more valence electron than a neutral bromine atom.
Potassium is a chemical element with symbol K (from neolatin potassium) and atomic number 19. Potassium is a silvery-white metal, soft enough to be cut with a knife of light force. Potassium metal reacts rapidly with atmospheric oxygen, producing flaky white potassium peroxide after just a few seconds of exposure. form the It got its name because it was first isolated from potash, the ash of plants. In the periodic table, potassium is one of the alkali metals, all of which have one valence electron in their outer electron shell, which can be easily removed to form positively charged ions (combined with anions to form salts). cations that form Potassium exists in nature only in ionic salts
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Answer: (C) It is a positive ion that has one less valence electron than a neutral potassium atom.
Explanation: Hope this Helps.
the half life of a certain radioactive sample is 1 hr. if the mass of the sample is 1 gram at noon, what will be the mass of the sample at 3pm?
The half life of a certain radioactive sample is 1 hr. if the mass of the sample is 1 gram at noon, what will be the mass of the sample at 3pm?
The half-life is the time it takes for one-half of the radioactive element to decay. The value of the half-life given here is one hour.
After one hour (1 PM) there would only be
(1/2)*(1 g)= 0.5 g of the element remaining.
After three hours (3 PM) there would only be
(1/2)*(1/2)*(1/2)*(1 g) = (1/8)g remaining.
Half-life is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. The term is also used more generally to characterize any type of exponential decay.
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ice freezing exothermic or endothermic?
Answer: exothermic reaction
Explanation:When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.
Answer: Exothermic Reaction
Explanation:
Exothermic: Releases heat and causes the temperature of the immediate surroundings to rise.
Endothermic: Absorbs heat and cools the surroundings.
When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.
Hope this helps :)
examine the melting points as you go down a family and across a period. is there a trend? if there is a trend, what is it? a. down a family: b. across a period
Both the melting and boiling factors lower down the group as the melting points as you go down a family and across a period. is there a trend.
As nicely discovered earlier, the greater delocalised electrons gift and the smaller the radius of the atom, the better the melting factor of the metallic. As we circulate throughout duration three the quantity of delocalised electrons consistent with metallic atom will increase and the radius of the factors decreases. This way the melting factor will increase.
The melting and boiling factors of the Group 1 factors lower on descending the group. This is because of a lower withinside the forces of appeal among the atoms. On crossing a duration withinside the Periodic Table the atomic length decreases. On descending a collection the atomic length will increase.In a duration, the melting and boiling factor first will increase after which decreases.
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Which is not found on the periodic table of elements. the atomic number of each element, the rarity of each element, the atomic mass of each element
Answer:
The rarity of each element.
Explanation:
The periodic table shows the atomic number and the atomic mass. The abundance (or rarity) of each element is not given.
Answer: sorry misclick
Explanation:
the compound of which two elements is most likely to involve covalent bonding? electronegativities of unknown elements q 0.9 x 3.0 r 1.0 z 4.0 t 2.8
The compound of T and X is most likely to involve covalent bonding.
The ability of an atom or functional group to draw electrons to itself is known as electronegativity in chemistry. An atom's electronegativity is influenced by both its atomic number and how far away from its charged nuclei its valence electrons are located.
The differences in the electronegativities are:
Q and Z : 4.0-0.9 = 3.1
R and X : 3.0-1.0 = 2.0
T and Z : 2.8-0.9 = 1.9
T and X : 3.0-2.8 = 0.2
Q and T : 2.8 - 0.9 = 1.9
Smallest difference in electronegativity causes a higher overlap in the orbitals of the shared electrons.
Therefore, the smallest difference between the given elements is between T and X.
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What are the relative positions of the sun, Earth, and moon at the times of lunar and solar eclipses, as well as new, first-quarter, full, and last-quarter phases of the moon?
The relative positions of the sun, Earth, and moon at the times of lunar and solar eclipse is the earth comes in between the moon and the sun.
The relative positions of the sun, Earth, and moon :
1) New moon : they are lined up with the moon comes in between the earth and the sun.
2) first quarter : the first quarter phase is when the earth - moo line is 90 ° away from the earth and sun line.
3) full moon : The moon , the earth and the sun line up and the earth is comes in between the moon and the sun.
4) the last quarter : the the last quarter phase is when the earth moon line is 270° away from the earth sun.
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This type of bias occurs when researchers fail to choose a representative sample of potential respondents is called?
The type of bias occurs when researchers fail to choose a representative sample of potential respondents is called sampling bias.
Sampling bias is the phenomenon that occurs when a research take a look at layout fails to collect a representative sample of a goal populace. This happens generally due to the fact that the selection standards for respondents failed to seize a wide enough sampling frame to represent all viewpoints.
Some of the commonplace varieties of sampling bias encompass self-selection bias, nonresponse bias, survivorship bias, pre-screening or advertising bias, and healthful user bias.
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Which are easier for your body to metabolize: saturated or unsaturated fats?
The unsaturated fats are easier for the body to break because they are liquid at room temperature.
What are unsaturated fatty acids?Unsaturated fats, which are liquid at room temperature, are regarded as healthy fats because they help reduce inflammation and raise blood cholesterol levels. Unsaturated fatty acids that have been converted to saturated fatty acids are known as trans fats.
Conversely, saturated fats lack double bonds, while unsaturated fats do. As a result, they take on a kinkier shape and don't pack as tightly. Their bonds are more easily broken when molecules are farther apart.
Therefore, since unsaturated fats are liquid at normal temperatures, the body may more easily break them down.
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you are in a place that is extremely hot and dense. you can't see far because your surroundings are opaque to light. around you, nuclear fusion is converting carbon into oxygen and other elements. where are you?
The expansion of the universe suggests that items were once closer together, because material becomes hotter and denser when it is compressed.
Nuclear fusion is transforming carbon into oxygen and other elements while you are at the center of a big star near the end of its life, which makes it difficult for you to see far because the area is opaque to light around you. Later, in a process known as stellar nucleosynthesis, the heavier elements were produced from hydrogen. This was a prolonged process whereby hydrogen and helium were fused together in the stars, which acted as enormous furnaces, at various points of their lives. The universe had gotten bigger.
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Which of the following is a sign that a chemical change has occurred?
Group of answer choices
glass changes shape when it falls and breaks
water produces a gas when it is placed on a hot stovetop
a firework explodes releasing heat, sound, and light energy
a substance becomes cold when it is placed in the freezer
The change that represents a chemical change is; a firework explodes releasing heat, sound, and light energy
What is a chemical change?We define a chemical change as one in which there is the alteration of the reactants and the products. The chemical bonds in the reactants and the products are broken up in a chemical change.
This is why we can say that when there is a chemical change, there would be the formation of a new substance and then there could be some markers of a chemical change that could take place in the system and these may include but are not limited to;
Appearance of a new color
Change in the temperature
Evolution of a gas
Thus the explosion of the firework is a typical example of the ocurence of a chemical change .
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Give short answers for the following
1. Comment Dalton's atomic theory and the areas in which modifications were
made.
Dalton's atomic theory was having different postulates. Some of them are:
1. All matters are made up of tiny indivisible particles called atoms.
2. All atoms are identical in mass, size and many other properties.
3. Atoms can be neither created nor destroyed.
4. Atoms can be combined or separated from elements.
But all these theories were modified:
1. Atom can further be divided into 3 parts electron, proton and neutron.
2. Isotopes are members of same atoms family but still have different properties. Isotopes are the number which have same atomic number but different mass number. Example Carbon isotopes.
3. This Theory failed for isobars. Isobars are the elements which have different atomic number but same mass number. Example Ar and Ca
4. This theory failed for Allotropes. Allotropes are the member of same family with different properties. Example Diamond and Graphite which are of carbon family.
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How much amount of NaCl is decomposed by 4.9 g of H2SO4 if 6g of nahso4 and 1.825 g of HCL are produced in the same reaction 6 g 4.9 g 1.825 g 2.925 g?
2.925 g NaCl is decomposed by 4.9 g of H2SO4. If 6g of nahso4 and 1.825 g of HCL are produced in the same reaction
We have to find out how much amount of NaCl is decomposed in reaction,Where we have given mass of reactant and product as follow;
Mass of H2SO4 = 4.9g
Mass of NaHSo4 = 6g
Mass of HCL = 1.825g
The reaction can be given as:
NaCl + H2SO4 → NaHSO4 + HCl
According to law of conservation of mass:
W(NaCl) + W(H2SO4) = W(NaHSO4) + W(HCl)
W(NaCl) + 4.9g = 6g + 1.825g
W(NaCl) = 6+1.825−4.9
W(NaCl) = 2.925 g
So, 2.95 g of NaCl is Decomposed by H2SO4 during reaction.
What is the law of conservation of mass?
It states that all chemical equations must be balanced because matter cannot be created or destroyed in chemical reactions. Mass of Reactant and Mass of product after reaction are always same.
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what happens during radioactive decay? group of answer choices a stable isotope of one element changes into a new isotope of a different element a stable isotope of one element changes into a new isotope of the same element an unstable isotope of one element changes into a new isotope of a different element an unstable isotope of one element changes into a new isotope of the same element
They emit ionizing radiation (alpha, beta, and/or gamma rays) that has the property of releasing energy. Because it has the potential to dislodge firmly bound electrons from an atom's orbit, the energy is known as ionizing radiation.
In plain English, what is radioactive decay?a radioactive process where a nucleus spontaneously splits, loses electrons, or undergoes fission while also emitting radiation.
What is lost when radioactive material decays?Some of the mass of uranium nuclei is transformed into kinetic energy during radioactive decay (the energy of the moving particles).
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In an electrolytic cell the electrode at which the electrons enter the solution is called the ______ ; the chemical change that occurs at this electrode is called _______.
9. A gas sample occupies 3.25 liters at 24.5 °C and 1825 mm Hg. Determine
the temperature at which the gas will occupy 4250 mL at 1.50 atm.
Answer: 243K
Explanation:
which amino acid contains sulfur atoms that form covalent disulfide bonds and stabilize the tertiary structure of some proteins?
Cysteine, amino acid contains sulfur atoms that form covalent disulfide bonds and stabilize the tertiary structure in some proteins.
What are Amino acids?Organic substances known as amino acids are primarily made up of nitrogen, carbon, hydrogen, and oxygen. Twenty distinct amino acids are required by your body for growth and optimal operation. All 20 of them are crucial for your health, but only 9 are considered to be absolutely necessary.
What are proteins?Organic molecules called proteins are found in all living things. They perform a wide range of tasks, such as transportation, organizing, and defence. Proteins have up to four different layers of structure and are made up of chains of amino acids.
What are Disulfide bonds?An S- anion from one sulfhydryl group acts as a nucleophile, attacking the side chain of a second cysteine to create a disulfide bond, and in the process releases electrons (reducing equivalents) for transfer. Disulfide bond formation involves a reaction between the sulfhydryl (SH) side chains of two cysteine residues.
Hence, cysteine, amino acid contains sulfur atoms that form covalent disulfide bonds and stabilize the tertiary structure in some proteins.
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if 10.0 g of aluminum reacts with excess sulfuric acid, and 54.2 g of al2(so4)3 are collected, what is the percent yield of al2(so4)3? a) 63.4% b) 85.5% c) 117% d) 47.1% e) not enough information given
The percent yield of al2(so4)3 is option B. 85.58%.
In chemistry, yield, additionally called reaction yield, is a measure of the quantity of moles of a product fashioned in relation to the reactant fed on, acquired in a chemical reaction, generally expressed as a percent.
Percent yield is the percent ratio of real yield to the theoretical yield. it is calculated to be the experimental yield divided through theoretical yield expanded by one hundred%. If the real and theoretical yield are the equal, the percentage yield is one hundred%.
Calculation:-
2Al+3H2SO4 → Al2(SO4)3+3H22
27*2 g of Al produces = 342 g Al2(SO4)3
10 g Al Produces = 342 /54 × 10
= 63.33
percentage yield = 54.2/63.33 × 100
= 85.58%
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While attempting to determine the structure of a compound using elemental analysis and functional group tests, you are generally able to recover your original sample.
a. True
b. False
True, You can typically get your original sample back when utilizing functional group tests and elemental analysis to try to figure out a compound's structure.
Which test is applied to a compound's elemental analysis?In an elemental analysis, the sodium test, also known as Lassaigne's test, is used to determine whether certain foreign elements, such as halogens, nitrogen, sulfur, and phosphorus, are present in an organic compound.
What analytical techniques can be used to ascertain a compound's structure?The four primary methods are mass spectrometry, nuclear magnetic resonance (NMR) spectroscopy, infrared (IR), and ultraviolet and visible spectroscopy. A minimal amount of sample is required for spectroscopy, and after an IR, NMR, or UV spectrum has been generated, the sample can be reused.
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why does the temperature of the reaction mixture drop (as opposed to remaining constant) once the reaction reaches the stoichiometric point?
The reaction is no longer operating and no longer producing heat, which causes the temperature to drop. Additionally, the temperature of the reactant solution added after the stoichiometric point is achieved is lower than that of the reaction mixture.
What is Stoichiometric Point?
The titration's equivalence point is reached by adding just enough titrant to totally neutralize the analyte solution. The titrant's moles (a standard solution) are equivalent to the moles of the unknown-concentration solution. Because it is at this point that the quantity of acid needed to neutralise an identical amount of base is equal, it is often referred to as the stoichiometric point. Please take note that this does not imply that the acid to base ratio is 1:1. The equation for a balanced acid-base chemical reaction determines the ratio.
Actually at the equivalence point, the titrant and analytes have completely reacted, that's why temperature drop.
The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of bases and acids have been mixed
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PLEASE HELP: Explain why most substances are carbon compounds?
Answer:
The reason is carbon's ability to form stable bonds with many elements, including itself.
Explanation:
This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things!
Answer:
Explanation:
The reason is that carbon is able to form stable bonds with many elements, including itself, which allows carbon to form a huge variety of very large and complex molecules.
nmr spectroscopy, or_____magnetic resonance spectroscopy, is a very important tool in the determination of organic structures. this technique relies on the interaction of a particular nucleus with a field followed by absorption of energy of a specific____, depending on the chemical environment of the nucleus.
NMR spectroscopy, or nuclear magnetic resonance spectroscopy, is a very important tool in the determination of organic structures. This technique relies on the interaction of a particular nucleus with a magnetic field followed by absorption of energy of a specific frequency depending on chemical environment of the nucleus.
what is NMR spectroscopy?
NMR spectroscopy can be defined as an indispensable tool which applies magnetic field to an atomic nucleus (e.g., the most common stable isotopes 1H, 13C, 15N) and radio frequency pulses to characterize resonant frequency of that atomic nucleus according to its chemical or environmental surroundings
Nuclear magnetic resonance (NMR) spectroscopy is advanced characterization technique. It is used to determine molecular structure at the atomic level of a sample.learn more about NMR spectroscopy at
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Energy from the_______is constantly passing through the different layers of the atmosphere as waves, landing on and
being absorbed into the Earth's surface to provide the heat and warmth for
life.
A. insolation
B. weather
C. air
D. conduction
E. ozone
F. ecological
G. atmosphere
H. sun
I. convection
J. tilts
Answer:
H.Sun
Explanation:
The heat source for our planet is the Sun. Energy from the sun is transferred through space and through the earth's atmosphere to the earth's surface. Since this energy warms the earth's surface and atmosphere, some of it is or becomes heat energy.
So the answer is H.Sun
An electrolyte is a substance that dissolves in water to yield a solution that conducts electricity
An electrolyte is a substance that dissolves in water and produces ions that conducts electricity.
What is an electrolyte?An electrolyte can be described as a medium containing ions that are electrically conducting through the movement of ions but not conducting electrons. Most soluble salts, acids, and bases can be dissolved in a polar solvent, such as water. Upon dissolving, the substance dissociates into cations and anions, which disperse throughout the solvent.
The movement of cations and anions in opposite directions within the solution and conduct electricity in a solution such as a hydrogen chloride (HCl), under conditions of high temperature or low pressure, can function as electrolytes.
Electrolyte solutions are formed when salt is placed into a solvent and the individual components separate due to the thermodynamic interactions between solvent and solute, in a process known as "solvation".
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How do you calculate moles at STP?
The following formula will calculate the amount of moles at STP: Molar volume at STP (litres)/Volume at STP (litres).
At STP, moles can be converted to gas volume and gas volume to moles using molar volume. The conversion factor is based on the equality 1mol=22.4L. The molar volume of a gas at STP, which is defined as 273.15 K (0°C) and 1 atm, is 22.414 L/mol. 0°C (273.15 K) and 1 atm of pressure are considered standard temperature and pressure (STP). The volume of one mole of a gas at STP is its molar volume. A mole (6.02 1023 typical particles) of any gas at STP takes up 22.4 L of space.
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Arrange the boiling points of the aqueous solutions, relative to pure water. Assume complete dissociation for the ionic compounds.
The boiling points are arranged from highest to lowest as follows:
0.18m CaI₂
0.12 m KI
H₂O
0.30 m NH₃
0.37m C₂H₅OH
what is the boiling point?Boiling point is the temperature at which the pressure in the system equals atmospheric pressure. This temperature varies from liquid to liquid and can be used to identify what a particular liquid is.
It should be noted here that the boiling point elevation of a substance is a collective property. This means that the amount of material present is important. Therefore, to know how the boiling points of different substances change, we need to consider the number of particles that are in the system.
Aqueous solutions are homogeneous mixtures of matter and water.
Ionic compounds are neutral compounds. Ionic compounds are formed from cations and anions.
your question is incomplete but most probably your full question was
Arrange the boiling points of the aqueous solutions, relative to pure water. Assume complete dissociation for the ionic compounds.
0.12 m KI0.37 m C₂H₅OH0.30 m NH₃0.18 CaI₂H₂OLearn more about colligative properties: brainly.com/question/10323760
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if an ideal gas initially at 5 bar and 12.5 l is compressed at constant temperature to 2.5 l, what is the final pressure of the gas? g
The final pressure of the gas with initial pressure of 5 bar and initial volume of 12.5 L is 25 bar.
The Boyle's law can be used to explain the pressure-volume relationship of an ideal gas at constant temperature. The final pressure can be easily predicted using the relation as shown below if the beginning pressure and volume of an ideal gas are known at a constant temperature with the final volume.
P1V 1 = P2V 2
P 1 denotes the starting pressure, P2 is the ending pressure, V 1 is the starting volume, and V 2 is the ending volume.
The initial pressure P1= 5 bar
The initial volume V1= 12.5 L
The final volume V2= 2.5 L
The final pressure P2=?
P1V1=P2V2
5×12.5= P2× 2.5
P2= 62.5/2.5
P2= 25 bar
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how many grams of pbbr2 will precipitate when excess nh4br solution is added to 79.0 ml of 0.546 m pb(no3)2 solution?
The number of moles of HI needed is 0.1234 mol, Mass of PbBr2 is 21.3g , Volume of HI solution needed is 237 ml.
What is precipitate ?
It is common for an insoluble compound to form when a solution having a specific cation (a positively charged ion) is mixed with another solution carrying a specific anion (a negatively charged ion). The solid that divides is referred to as a precipitate.
What is excess solution ?
Reactant or reagent that is still present after a chemical reaction has finished is known as excess reagent. In other words, when a chemical reaction occurs, more of a reactant is present than is needed to complete the reaction.
1) Volume of Pb(NO3)2 solution = 76.0ml = ( 76.0ml) x ( 1L / 1000ml) = 0.0760 L
Number of moles of Pb(NO3)2 reacted = Molarity of Pb(NO3)2 solution x Volume of Pb(NO3)2 solution
= 0.764 molL-1 x 0.0760 L ( here M can be shown as molL-1)
= 0.05806 mol
As NH4Br is mentioned to be present in excess the amount of product PbBr2 depends on Pb(NO3)2
Number of moles of PbBr2 formed = Number of Pb(NO3)2 moles reacted = 0.05806 mol
Mass of PbBr2 = moles of PbBr2 x molar mass of PbBr2
= 0.05806 mol x 367 g/mol
= 21.3g
Thus mass of PbBr2 that will precipitate = 21.3g
2) MgCO3 moles = ( mass of MgCO3) / ( molar mass fo MgCO3)
= ( 5.20g / 84.3g/mol) = 0.0617 mol
Number of moles of HI needed = 2 x MgCO3 moles ( based on balanced equation coefficients)
= 2 x 0.0617 mol = 0.1234 mol
Volume of HI solution needed = ( Moles of HI solution needed) / ( Molarity of HI solution)
= ( 0.1234 mol / 0.520molL-1) ( here units M can be shown as molL-1)
= 0.237L
= 0.237L x ( 1000 ml / 1L)
= 237 ml
Thus volume of HI solution needed = 237 ml
Therefore, Number of moles of HI needed is 0.1234 mol, Mass of PbBr2 is 21.3g , Volume of HI solution needed is 237 ml.
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what is the crystal field stabilization energy of a low spin d7 complex in an octahedral crystal field?
the crystal field stabilization energy of a low spin d7 complex in an octahedral crystal field is −1.8Δo
The ligand is a strong field ligand, and the supplied complex is an octahedral complex. Since it has a low spin, the pairing energy will be lower than the energy required to split the crystal field.
CFSE for octahedral complex =[−0.4(n)t2g+0.6(n′)eg ]Δo+n∗P
Where,
n is number of e− occupying t2g orbital
n' is the number of e− occupying eg orbital
Δois ligand field splitting energy
n∗ is the number of extra electron pairs
P is spin-pairing energy
The CFSE of a d7 octahedral complex = −0.4×6+0.6×1
= −2.4+0.6
= −1.8Δo
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Write a nuclear equation to describe the neutron-induced fission of Pu-241 to form Kr-89 and Ce-149. Determine how many neutrons are produced in the reaction.
The number of neutrons produced in the reaction is 5.
Neutrons are the neutral particles present in the nucleus of any atom.
Nuclear equation:
2(1)n₀ + (241)Pu -----> (89)Kr + (149)Ce + 3n₀
In balancing nuclear equations- the sums of the superscripts and the subscripts must be the same on each side of the equation.
On Balancing the superscripts, we get:
2 + 241 = 89 + 149 + x
243 = 238 + x
x = 5
The balanced equation is:
2(1)n₀ + (241)Pu -----> (89)Kr + (149)Ce + 5n₀
Therefore, the number of neutrons produced in the reaction is 5.
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The compound ammonium sulfate consists of two ions, nh4 and so42–, both of which are ions. a molecule of the compound consists of nh4 ion(s) and so42– ion(s).
The compound ammonium sulfate consists of two ions, NH₄⁺ and SO₄²⁻, both of which are Polyatomic ions. A molecule of the compound consists of two NH₄⁺ ion(s) and one SO₄²⁻ ion(s).
Each ion in the ammonium and sulfate compounds has more than one atom. Therefore, the two species are polyatomic. For instance, the chloride ion is monoatomic.
The charge of the ions is indicated by superscripts above their equations. The charge of each ammonium ion is positive one (+1). The charge of each sulfate ion is negative two (-2).
An ionic substance is ammonium sulfate. Countless ammonium ions and sulfate ions can be found in this molecule. Three-dimensional lattices are used to organize the ions. As a result, unlike water, ammonium sulfate does not exist in nature as molecules.
assuming that the second and third blanks refer to an ammonium sulfate formula unit rather than a molecule. The ammonium sulfate empirical formula provides the smallest whole-number ratio between the two ions in a sample.
Charges between the two ions must be equal. Ions of ammonium have a charge of 1. Sulfate ions have a negative charge. As a result, the sample must have two ammonium ions for every sulfate ion.
As a result, is the empirical formula for ammonium sulfate.
Each formula unit of ammonium sulfate thus contains two ammonium ions and one sulfate ion.
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