Answer:
The mixture quickly foams up with carbon dioxide gas.
Explanation:
Answer:
Explanation:
When you mix vinegar and baking soda, you will get an acid solution.
What is the molar mass of water (H2O) in grams per mole?
To find the molar mass, what we do is to follow the steps:
1. Make use of the chemical formula to determine the number of atoms of each element in the compound.
2. Multiply the molar mass of each element with its number of atoms present in the compound.
3. Add up all and assign unit as grams/mole.
In this problem, the molecule of water contains 2 atoms of Hydrogen and 1 atom of Oxygen.
The molar mass of Hydrogen is about 1g/mol and the molar mass of Oxygen is about 16g/mol, so:
Therefore, the answer is 18 g/mol.
The chemical equation below shows the reaction of sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl).
2Na + Cl2 → 2NaCl
The chemical equation below shows the reaction of sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl).
2Na + Cl₂ ----> 2NaCl, NaCl formed is an ionic compound.
Sodium is a metal and have tendency to donate an electron and form Na⁺ .The chlorine is a non metal and have tendency to accept electron and form Cl⁻ ion. The positively charged Na⁺ ion and negatively charged Cl⁻ ion form ionic bond . An ionic bond is formed by the complete transfer of electrons. The product is form is NaCl , sodium chloride.
Thus, The chemical equation below shows the reaction of sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl).
2Na + Cl₂ ----> 2NaCl, NaCl formed is an ionic compound.
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How many valance electron‘s are in potassium 
Answer:
one valence electron
Explanation:
K is the symbol for potassium, and the number of valence electrons can be found through its' group on the periodic table. Hence, it has one valence electron.
Which set
correctly orders
the atoms from
lowest to highest
ionization
energy?
PLEASE HELP
Answer:
Pb, Sn, Te, S, Cl
Explanation:
What is the mass of a helium sample that contains 0.448 moles of He has?
To calculate the mass of Helium, we look up in the periodic table the atomic mass. This is equal to 4.003 g/mol.
Now, we apply the following relation to doing the conversion:
[tex]\begin{gathered} gH_{}e=\text{Given moles He}\times\frac{AtomicMass,\text{gHe}}{1\text{mol He}} \\ gH_{}e=\text{0.448}\times\frac{4.003\text{gHe}}{1\text{mol He}}=1.793\text{gHe} \end{gathered}[/tex]The mass of a Helium sample that contains 0.448 moles of He is 1.793 g
When filling orbital with electrons wefill according to Diagonal filling rulefill up s orbitals, then p orbitals, then d orbitalsfilling according to electrons spinfill each energy level before moving up
Explanation:
Orbitals are filled according to the aufbau principle. That is, lower energy orbitals are filled before higher energy orbitals are filled. Therefore, fill each energy level before moving up
Answer:
The second last option is correct.
a particular substance is typically found in nature as a pure element. what can you conclude about the reactivity of this element? (hint: which family contains elements that are generally found as pure elements?)
The element is likely a member of the noble gas family, which contains elements that are generally unreactive. A particular substance is typically found in nature as a pure element.
From this, we can conclude that the element is not reactive. The noble gas family is a group of elements in the periodic table that include helium, neon, argon, krypton, xenon and radon.
They are all non-reactive and have very low reactivity. The noble gases are all found in the air and are used in a variety of ways. Helium is used in balloons and airships, while argon is used in fluorescent lights. Krypton and xenon are used in flash photography, and radon is used in cancer treatment.
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(Multiple Choice) List the gases H2O, He, HCI, BrF, and NO2 in order of increasing average molecular velocityat 25°C.1. Rates of effusion:BrF< H20 < HC1 < NO2 < He2. Rates of effusion: BrF < He < HC1 < H2 < NO23. Rates of effusion: He < BrF < HC1
The average molecular velocity can be defined as follows:
[tex]v_m=\sqrt[]{\frac{3RT}{M}}[/tex]Where,
R is a constant
T is the temperature
M is the molar mass
If we assume that the temperature is the same for all gases, the velocity will vary according to its molar mass. We see that the molar mass is inversely proportional to the speed, the greater the mass of the gas, the slower it will move. Therefore we are going to determine the molar mass of the gases:
Therefore, the order according to the average velocity will go. We must organize from the largest molar mass to the smallest molar mass.
BrF
The answer will be 6. Option
2) A diver weighing 9 Newtons is on a diving board that is 16 meters high. What is the
diver's potential energy?
Answer: Unknown
Explanation:
In order to solve the question you would require the approximate amount of gravity upon the diver, meaning his acceleration due to gravity.
Picture in the bottom
how is the change in electronenergy related to the frequency of light emittedin electronic transitions?
A photon of light is released when an electron in its orbit around an atom transitions from a high energy state to a lower energy state. The statement E=hf, where h is Planck's constant.
It can be used to relate the energy of the photon to the frequency f of the photon, which is related to the color of the photon. The difference in energy between the two states is what causes the photon's varied wavelength (or, alternatively, frequency). The element's spectrum is made up of these released photons. The atomic emission spectrum of an element shows only specific colors, which indicates that only specific light frequencies are emitted. Excited electrons that revert to the ground state result in atomic emission spectra. The energy of the particular electrons are reflected in the light that is emitted. Because each element has a unique collection of electron energy levels, each element's emission spectrum is unique. The disparities between various pairs of numerous energy levels are shown by the emission lines. As electrons transition from higher energy orbitals to lower energy orbitals, lines (photons) are released. Nuclear Spectra. When atoms are stimulated, they release light at specific wavelengths that are associated with various colors.
Every element generates an own collection of spectral lines. Since no two elements produce the identical spectral lines, the line spectrum of an element can be used to identify it.
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What trend in electronegativity do you see as you go across a period/row on the table? What causes this trend?
Answer: It decreases as it goes down and increases as it goes to the right.
Explanation: This is because as it goes down, the elements are becoming bigger which makes the distance from the proton and electron to become further, causing the attraction to weaken. While as it goes to the right across a period, it increases because the number of protons increase and we know that if there are more protons, the pull of the electrons from the nucleus becomes stronger.
Will an aluminum ball with a density of 2.70 g/ml sink or float
The aluminum ball with a 2.70 g/mL will sink when placed in a water.
How do I know if the aluminum ball will sink?The density of a substance is defined as the mass per unit volume of the substance i.e
Density = mass / volume
Substance with higher density tends to sink when place in a liquid of lower density.
Fom the question given above, we were told that the density of the aluminum ball is 2.7 g/mL. We know also that the density of water is 1 g/mL.
If the aluminum ball is placed in the water, the aluminum ball will sink because it's density is greater than that of water.
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what family is 1s 2s 2p3s
Answer:
Explanation:
look at the periodic table to see where 8 electrons is on the table, Oxygen is 8, so this is an Oxygen atom, next what group does Oxygen belong to? It's reactive non-metals, if you didn't look at the periodic table
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Answer:
The process of separating a metal from its ore is known as smelting.
You were helping your science teacher put away lab materials. They asked you to carry sand, iron filings, and salt in cups to put away. However, a fellow student left their backpack in the middle of the floor. You fell over it and dropped all of the materials. After sweeping up the mess, all of the sand, iron filings and salt are mixed together. Your job now is to use the physical properties of these substances to separate the mixture and return the pure substances to their separate containers.
What physical property or properties might help you remove salt from the mixture? (2 points)
What process will you use to separate the salt from the mixture? (2 points)
What physical property of properties might help you remove iron from the mixture? (2 points)
What process will you use to separate the iron from the mixture? (2 points)
What physical property or properties might help you remove sand from the mixture? (2 points)
What process will you use to remove sand from the mixture? (2 points)
Now, list the steps that you will take to separate the three components of the mixture. Be specific enough that someone else could complete the mixture separation exactly as you have planned to do it. You may use bullet points and labeled diagrams to answer this question. (8 points, see rubric)
Physical property might help you remove salt from the mixture solubility. Process use to separate the salt from the mixture is filtration and Distillation. Physical property of properties might help to remove iron from the mixture is Magnetism. process will you use to separate the iron from the mixture is using magnet. Physical property or properties might help you remove sand from the mixture is solubility. process use to remove sand from the mixture Filtration.
First we separate iron fillings from the mixture by using magnet. Then we dissolve the sand and salt mixture in water. salt is soluble in water and sand is insoluble in water. sand is now can be separated by the filtration process. last we have salt mixed in water . on heating the solution water get evaporated and salt crystal are left behind.
Thus, Physical property might help you remove salt from the mixture solubility. Process use to separate the salt from the mixture is filtration and Distillation. Physical property of properties might help to remove iron from the mixture is Magnetism. process will you use to separate the iron from the mixture is using magnet. Physical property or properties might help you remove sand from the mixture is solubility. process use to remove sand from the mixture Filtration.
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Lead ions can be removed from solution by precipitation with sulfate ions. Suppose a solution contains lead(II) nitrate.
1) List the compounds involved in the reaction.
Lead (II) nitrate
Potassium sulfate
Lead (II) sulfate
Potassium nitrate.
2) Write the formula of every compound.
Lead (II) nitrate: Pg(NO3)2
Potassium sulfate: K2SO4
Lead (II) sulfate: PbSO4
Potassium nitrate: KNO3
3) Write the chemical equation
.
[tex]Pb(NO_3)_2+K_2SO_4\rightarrow PbSO_4+KNO_3[/tex]List the elements (or polyatomic ions) in the reactants.
Pb: 1
NO3: 2
K: 2
SO4: 1
List the elements (or polyatomic ions) in the products.
Pb: 1
NO3: 1
K: 1
SO4: 1
Balance K.
[tex]Pb(NO_3)_2+K_2SO_4\rightarrow PbSO_4+2KNO_3[/tex]List the elements (or polyatomic ions) in the reactants.
Pb: 1
NO3: 2
K: 2
SO4: 1
List the elements (or polyatomic ions) in the products.
Pb: 1
NO3: 2
K: 2
SO4: 1
4) Balanced chemical equation.
[tex]Pb(NO_3)_{2(aq)}+K_2SO_{4(aq)}\rightarrow PbSO_{4(s)}+2KNO_{3(aq)}[/tex].
If the mole fraction of K2SO3 in an
aqueous solution is 0.0328,
what is the weight/weight %
(percent by mass) of K₂SO3?
Molar Mass
K₂SO3: 158.26 g/mol
H₂O: 18.016 g/mol
Enter text here
Based on the mole fraction, the mass percentage of K₂SO₃ in the solution is 23.0%
What is the mass percentage of K₂SO₃ in the given solution?The mass percentage of K₂SO₃ in the given solution is determined from the mole fraction as follows:
The mole fraction of K₂SO₃ = 0.0328 moles
The moles of water in the solution = 1 - 0.0328 moles
The moles of water in the solution = 0.9672 moles
mass of substance = moles * molar massThe mass of K₂SO₃ = 0.0328 * 158.26 g
The mass of K₂SO₃ = 5.19 g
The mass of water in the solution = 0.9672 * 18.016
The mass of water in the solution = 17.42 g
Total mass of solution = 5.19 + 17.42
Total mass of solution = 22.61 g
Mass percent of K₂SO₃ = 5.19/22.61 * 100%
Mass percent of K₂SO₃ = 23.0%
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A few of the alpha particles were deflected. What does this evidence suggest about the structure of the gold atoms?
Answer:
Most alpha particles passed straight through the gold foil, which implied that atoms are mostly composed of open space. Some alpha particles were deflected slightly, suggesting interactions with other positively charged particles within the atom.
Explanation:
Rutherford model, also called Rutherford atomic model, nuclear atom, or planetary model of the atom, description of the structure of atoms proposed (1911) by the New Zealand-born physicist Ernest Rutherford. The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.
15 grams of water into moles
0.83 moles present in 15 grams of water .
moles=given mass/molar mass
given mass=15 grams
molar mass, water=18 gram
moles=given mass/molar mass
moles=15/18
moles=0.83
The mole concept is a helpful technique to quantify the amount of a material. When dealing with particles at the atomic (or molecular) level, it is recognized that even one gram of a pure element has a vast number of atoms. The mole concept is widely used in this context. The most used unit of measurement is the "mole," which is a count of a significant number of particles.
The number 6.02214076*1023, also known as the Avogadro constant, is usually denoted by the letter "NA". Among the elementary things that may be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).
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ASSESSMENT QUESTIONS
4. PART A: In paragraph 4, the author describes
the path to the village as having "a 19th-
century feel." How does this description
contribute to the the central idea of the text?
OA. It emphasizes that un-electrified regions
have been left behind by international
advances in technology.
OB. It highlights how living without electricity
is the norm and the rural population
accepts this way of life.
OC. It portrays the people in the rural villages
as inferior because of their subpar living
conditions.
OD. It characterizes the lifestyle of those living
without electricity as being of a simpler time
It emphasizes that un-electrified regions have been left behind by international advances in technology. Option A.
A central idea is the central unifying element of a story that ties together all other elements of fiction that the author uses to tell the story. The central idea is best described as the dominant impression or universal, prevalent truth found in the narrative: renewable energy sources such as wind, water, solar and geothermal.
The refrigerator or freezer may be out of power. The phone line goes down and the phone signal is lost. When the battery gets low, the phone becomes useless as there is no backup charging option. The gas central heating doesn't work and the tap stops pumping clean water quickly. Sustainable energy comes from resources that can sustain continuous operation without jeopardizing the energy needs or climate of future generations.
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addition of which metal ion or combination of ions restores alkaline phosphatase activity closest to that of native enzyme?
Mg, Zn metal ion or combination of ions restores alkaline phosphatase activity closest to that of native enzyme.
The physiological function of alkaline phosphatase is to dephosphorylate substances. The enzyme is present across a wide range of prokaryotes and eukaryotes, serving the same general purpose but taking on different structural forms depending on the environment in which they are active.
The periplasm of E. coli bacteria contains alkaline phosphatase. The highest activity of this enzyme occurs at high pH levels and it is heat stable. Depending on where it originated in the body, it might appear in a variety of ways in people.
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silicon, tin, and lead are all in the same group. the density of tin is about 7.28 g/cm3 and the density of lead is about 11.34 g/cm3. based on this group trend, what do you estimate the density of silicon to be?
The atom's radius and mass increase from top to bottom. The density of elements from top to bottom also increases in a periodic table.
Density of Sn= Mass of Sn/Volume of Sn
=24.3968/7.28
=3.49 g/ml*ml/cm³
=3.49 g/cm³
It is accurate to assume that the density of Sn will fall between that of Si and lead . the mass number and radius of the atoms increase from group to group as we move from top to bottom in a periodic table.. The density rises because the increase in mass number is greater than the increase in radius. Simply multiplying by the molar mass of the gas allows one to derive the formula for mass density from the formula for number density. Do not forget that the mass is equal to the moles (n) times the molar mass (M). Smaller masses can be measured in grams instead of kilograms (kg), which is the standard SI unit for mass.
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what is the relationship between the raw materials and the products in photosynthesis
Answer:
Plants perform photosynthesis in the presence of sunlight, water and carbon dioxide to produce food and oxygen. Sunlight, water and carbon dioxide are the raw materials; food and oxygen are the products of photosynthesis
Answer:
Photosynthesis is the conversion of light energy into chemical energy by living organisms.
Explanation:
The raw materials are carbon dioxide and water; the energy source is sunlight; and the end-products are oxygen and (energy rich) carbohydrates, for example sucrose and starch. This process is arguably the most important biochemical pathway, since nearly all life depends on it. It is a complex process occurring in higher plants, phytoplankton, algae, as well as bacteria sucl as cyanobacteria. Photosynthetic organisms are also referred to as photoautotrophs.
How many grams of calcium phosphate (Ca3(PO4)2) re theoretically produced if we start with 3.40 moles of Ca(NO3)2 and 2.40moles of Li3PO4?Reaction: 3Ca(NO3)2 + 2L13PO4-6LINO3 + Ca3(PO4)2A) 310B) 1054C) 248D) 351
1) Balance the chemical equation.
[tex]3Ca(NO_3)_2+2Li_3PO_4\rightarrow6LiNO_3+Ca_3(PO_4)_2[/tex]2) List the known and unknown quantities.
Reactant 1: Ca(NO3)2.
Amount of substance: 3.40 mol.
Reactant 2: Li3PO4.
Amount of substance: 2.40 mol.
Product: Ca3(PO4)2
Mass: unknown.
3) Which is the limiting reactant?
3.1-How many moles of Li3PO4 do we need to use all of the Ca(NO3)2?
The molar ratio between Li3PO4 and Ca(NO3)2 is 2 mol Li3PO4: 3 mol Ca(NO3)2.
[tex]mol\text{ }Li_3PO_4=3.40\text{ }mol\text{ }Ca(NO_3)_2*\frac{2\text{ }mol\text{ }Li_3PO_4}{3\text{ }mol\text{ }Ca(NO_3)_2}=2.2667\text{ }mol\text{ }Li_3PO_4[/tex]We need 2.2667 mol Li3PO4 and we have 2.40 mol Li3PO4. We have enough Li3PO4. This is the excess reactant.
3.2-How many moles of Ca(NO3)2 do we need to use all of the Li3PO4?
The molar ratio between Li3PO4 and Ca(NO3)2 is 2 mol Li3PO4: 3 mol Ca(NO3)2.
[tex]mol\text{ }Ca(NO_3)_2=2.40\text{ }mol\text{ }Li_3PO_4*\frac{3\text{ }mol\text{ }Ca(NO_3)_2}{2\text{ }mol\text{ }Li_3PO_4}=3.60\text{ }mol\text{ }Ca(NO_3)_2[/tex]We need 3.60 mol Ca(NO3)2 and we have 3.40 mol Ca(NO3)2. We do not have enough Ca(NO3)2. This is the limiting reactant.
4) Moles of Ca3(PO4)2 produced from the limiting reactant.
We have 3.40 mol Ca(NO3)2 of the limiting reactant.
The molar ratio between Ca(NO3)2 and Ca3(PO4)2 is 3 mol Ca(NO3)2: 1 mol Ca3(PO4)2.
[tex]mol\text{ }Ca_3(PO_4)_2=3.40\text{ }mol\text{ }Ca(NO_3)_2*\frac{1\text{ }mol\text{ }Ca_3(PO_4)_2}{3\text{ }mol\text{ }Ca(NO_3)_2}=1.1313\text{ }mol\text{ }Ca_3(PO_4)_2[/tex]5) Mass of Ca3(PO4)2 produced.
The molar mass of Ca3(PO4)2 is 310.1767 g/mol.
[tex]g\text{ }Ca_3(PO_4)_2=1.1333\text{ }mol\text{ }Ca_3(PO_4)_2*\frac{310.1767\text{ }g\text{ }Ca_3(PO_4)_2}{1\text{ }mol\text{ }Ca_3(PO_4)_2}[/tex][tex]g\text{ }Ca_3(PO_4)_2=351.526\text{ }g\text{ }Ca_3(PO_4)_2[/tex]The mass of Ca3(PO4)2 produced is 351 g Ca3(PO4)2.
Option D.
.
pls answer question will mark brainliset tyty
The option (1) water supply i.e. the biotic factor that affect the human most.
Competition is a biotic element that prevents population increase in an aquatic habitat since it involves living things.Competition is an interaction between individuals or species where the presence of another reduces the fitness of one. A factor may be the limited availability of at least one resource (such as food, water, and territory) used by both.Abiotic elements including as depth, sunlight, nutrients, and oxygen availability have an impact on population increase in aquatic ecosystems.An ecosystem's overall health is also influenced by biotic factors such as the diversity of consumers and the presence of autotrophs, or self-sustaining organisms like plants. Abiotic variables have an impact on an organism's capacity for survival and reproduction. Abiotic barriers prevent the formation of population .
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28.The region labeled C above refers to what type of solution?Select one:a. Acidicb. Basicc. Neutrald. Salt
Answer
B. Basic
Explanation
Any solution above 7.0 (from 7.1 to 14.0) is alkaline/basic. This type of solution is at 11, meaning it is alkaline/basic.
Explain the Different types of electromagnetic wave
The different types of electromagnetic radiation are: Radio waves, Microwave, Infrared waves, Visible light, Ultraviolet waves, X-rays, Gamma rays. Radio waves have the lowest frequencies, and gamma rays have the highest frequencies.
Radio waves are electromagnetic radiation with frequencies as high as 300 gigahertz (GHz) to as low as 30 hertz (Hz). At 300 GHz of frequency, the corresponding wavelength is 1 mm, and at 30 Hz it is estimated to be 10,000 km.
Microwaves are a type of electromagnetic radiation. The wavelengths of microwave ranges from about one meter to one millimeter; with frequencies between 300 MHz (1 m) and 300 GHz (1 mm).
Infrared waves are a type of electromagnetic radiation. They are often referred to as thermal radiation because they are emitted from objects that are hot.
The visible spectrum is the portion of the electromagnetic spectrum that can be seen by the human eye. The spectrum ranges from 380 to 750 nanometers. The colors of the visible spectrum are often described as a rainbow: red, orange, yellow, green, blue, and violet.
Ultraviolet (UV) radiation is a type of electromagnetic radiation that is located before the visible range this region is invisible to the human eye. It has a shorter wavelength than visible light and is able to penetrate the atmosphere, making it harmful to living organisms.
X-rays are a type of electromagnetic radiation that is used to create images of the inside of the body. X-rays are produced by a machine called an X-ray tube. X-rays are used to diagnose many different conditions, including broken bones, tumors, and pneumonia.
Gamma rays are much more energetic than any of those other types of radiation. In fact, gamma rays are so energetic that they can actually kill living cells.
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Hi everyone,
The General formula for relative abundance
First 1:
Copper is made up of two isotopes.
Cu-63(62.9296 amu)
Cu-65(64.9278 amu)
Giving copper atomic weight of 63.546. What is the percentage abundance of each isotope?
Copper is made up of two isotopes ⁶³Cu(62.9296 amu) ⁶⁵Cu(64.9278 amu) Giving copper atomic weight of 63.546 then the percentage abundance of each isotope ⁶³Cu = 70% and ⁶⁵Cu = 30.848%
Isotopes are the members of a family of elements that all have the same number of protons and different numbers of neutrons
Here given data is
⁶³Cu = 62.9296 amu
⁶⁵Cu = 64.9278 amu
atomic weight = 63.546
We have to calculate percentage abundance of each isotope = ?
Let the natural abundance of ⁶³Cu is x
The natural abundance of ⁶⁵Cu 100−x
atomic weight is 63.546
Then 100×63.546 = 63x + 65(100−x)
= 6354.6 = 63x + 6500−65x = 6500−2x
= 2x = 145.4
= x = 72.7≃70
Hence the natural abundance of ⁶³Cu is is 70%
Therefore for ⁶⁵Cu the calculation the also same and ⁶⁵Cu = 30.848%
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The direction of force of Earth's magnetic field is from the geographic South
Pole to the geographic North Pole. Where is Earth's magnetic south pole?
• A. Near Earth's equator
• B. Near Earth's North Pole
• C. Near Earth's center
• D. Near Earth's South Pole
SUBMIT