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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3. The total magnification of the specimen is 500x and the eyepiece has 60x. What is the magnification of the objective?
Answer:
Explanation:
500 = 60 * ?
500/60 = ?
8.33333333333 = ?
so it's 8 and one third :)
What mass of HgO is required to produce 0.726 mol of O2?
2HgO → 2Hg + O2
A. 314g
B. 0.003g
C. 628.16g
D. 0.410g
Answer:
A
Explanation:
2 mol HgO : 1 mol O2
1 mol HgO is 216.589 grams
2 mol HgO is 433.178 grams
433.178 grams HgO : 1 mol O2
(0.726) 433.178 grams HgO : (0.726) 1 mol O2
314.4 grams HgO : 0.726 mol O2
or just 314 grams
chemistry is the discipline that studies a) various forces of the physical world. b) electrical charges. c) the composition of matter and how it changes. d) the interaction of elements and living organisms.
Option c . The composition of matter and how it changes.
What is chemistry ?Chemistry is the study of matter, including its composition, characteristics, and processes of change. Chemistry is the ability to explain the components of a cake and how they alter throughout baking.Everything that is physically real and has mass and takes up space is considered to be matter. Some things, like this book, are clearly identifiable as being made of matter. Some are more subtle. We occasionally forget that the air is also made of matter since we move through it so readily.One type of science is chemistry. By observing, testing, and then developing models that account for our observations, science is the process by which we learn about the natural world.Learn more about chemistry refer to :
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what is the wavelength of light if the frequency is 7.0*10^16 Hz
49 becase you multilpy it
Explanation:
Chemical equations Help pleaseeeeee
Is this balanced?
Equation
2 H₂ + 1 o₂ ➪2 H₂O
Yes, the eqⁿ is balanced.
Explanation:
The reaction between hydrogen and oxygen results to the formation of water.
[tex]{ \purple{ \sf{2 H₂ + 1 \: O ₂ \: ➪ \: 2 H₂O}}}[/tex]
To check whether the eqⁿ is balanced, let us count the numbers in the reactant and product sides
L.H.S.
H = 2×2 = 4.
O = 2×1 = 2.
R.H.S.
H = 2×2 = 4
O = 2×1 = 2.
Hence it is a balanced chemical equation.
Answer : yes ,it is balanced so your answer should look like this with the state symbols
2H2(g)+O2(g)→2H2O(l)
Fill in the table with the mass of each sample. Use the periodic table to find the molar mass of each compound. Then calculate moles and particles. Periodic TableThe two compounds have the same number of moles. Compare how the number of moles relates to the masses and number of particles for each compound.
1) First, let's calculate the molar mass of NaCl and CoCl₂:
Atomic mass of:
Na - 22.99 g/mol
Cl - 35.45 g/mol
Co - 58.93 g/mol
So for NaCl:
22.99 + 35.45 = 58.44 g/mol
Molar mass of NaCl = 58.44 g/mol
For CoCl₂:
58.93 + (2x35.45) = 129.83 g/mol
Molar mass of CoCl₂: 129.83 g/mol
2) Now let's find out the number of moles of each sample. For this, we use the following equation:
moles = mass / molar mass
NaCl:
mole = 116.8 / 58.44
mole = 1.999 moles of NaCl
CoCl₂:
mole = 259.7 / 129.83
mole = 2.000 moles of CoCl₂
3) To find the amount of particles, we use the Avogadro's constant. Avogadro's constant is a constant of proportion between the amount of matter and the number of entities that are linked to that amount. These entities can be atoms, molecules, ions, electrons, protons, neutrons.
In this case, we have the same number of moles, so we will have the same number of particles for both NaCl and CoCl₂.
What is the standard entropy change for the combustion of 1 mole of diamond at room temperature?.
Diamond's standard enthalpy is zero at 298 K and 1 atm of pressure.
What is standard entropy change?Any crystalline substance has zero entropy at 0 K, with the slight exception of the influence of crystal flaws. That contains diamond and graphite.To calculate the reaction's enthalpy, S°, add up the absolute entropies of the reactants and products and subtract them from one another. Then, multiply each result by the relevant stoichiometric factors.The difference between the sum of the molar entropies of the products and the sum of the molar entropies of the reactants can be used to calculate the change in the standard molar entropy of a reaction.You can use the equation shown below. ΔSo=ΣnSo(products)−ΣnSo(reactants) The difference between the total standard entropies of the products and the total standard entropies of the inputs is the standard entropy change.To learn more about standard entropy change refer to:
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Given the following unbalanced equation: KClO3 -> KCl + O2A) how many molecules of O2 can be produced by letting 12.00 moles of KClO3 react?B) how many moles of KCl can be produced by letting 4 moles of KClO3 react?
Step 1: Balance the equation
To balance the equation it is necessary to have the same number of atoms of each element on both sides of the equation (reactant side and product side). Let's count the number of atoms of each element for the unbalanced equation: KClO3 -> KCl + O2
Reactant side:
K - 1
Cl - 1
O - 3
Product side:
K - 1
Cl - 1
O - 2
To balance the equation, we need to fix the number of atoms of O on the product side, let's add a 3/2 in front of it:
KClO3 -> KCl + 3/2 O2
The equation is balanced but 3/2 is not an integer. So let's multply all the equation by 2:
2 KClO3 -> 2 KCl + 3 O2
Now the equation is balanced.
A) To solve this, we need to use the ratio between O2 and KClO3. It is 3:2.
so:
3 moles of O2 ---- 2 moles of KClO3
x moles of O2 ---- 12 moles of KClO3
x = 18 moles of O2
We found the number of moles, the question asks us the number of molecules.
For this, we need to use the avogadro's constant:
6.022x10^23 molecules ---- 1 mol
x molecules ---- 18 moles
x = 1.1 x 10^25 molecules of O2
B) To solve this we use the ratio between KCl and KCl3. It is 2:2
So it is produced 4 moles of KCl when 4 moles of KClO3 react.
which metalloid has five valence electrons in the fourth electron shell
Answer:
Explanation:
Arsenic is the the metalloid which has "five valence electrons" in the "fourth electron shell". Explanation: Metalloids are found between the metals and non-metals in the periodic table.
hope it helps
Order the following elements by increasing ionization energy
Si
Mg
Ci
Ar
Answer: yes
Explanation: no
describe and explain relationships between reactants and products in chemical changes that occur in the oceanic environment.
Scientists refer to the long-term alteration in ocean chemistry caused by CO2 absorption from the environment as ocean acidification.
The reaction can be expressed as:
[tex]CO_{2}[/tex] + [tex]H_{2} O[/tex] → ([tex]H^{+}[/tex]) +. ([tex]HCO3^{-}[/tex]).
Ocean acidification is a process that happens when the water absorbs too much carbon dioxide. In the equation, [tex]CO_{2}[/tex] represents carbon dioxide. The [tex]CO_{2}[/tex] in the equation represents the water molecules in which the carbon dioxide reacts.
Ocean acidification is the term for a long-term decrease in the ocean's pH that is mostly brought on by the ocean's absorption of carbon dioxide ( [tex]CO_{2}[/tex]) from the atmosphere.
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where are the reproductive parts of plants located?leaves,flower,roots, stem
The reproductive part of plants is located in flowers.
The flowers are the reproductive part of a plant.
Stamens are the male reproductive part.
The pistil is the female reproductive part.
Process of reproduction in a plant:
Pollen is transferred from one flower to another by insects or the wind. Pollination is the name given to this procedure.When pollen enters a fresh flower, it moves to the ovary where it fuses the ovules, the egg cells that become seeds, to produce seeds.Animals or the wind can disperse the seeds.To know more about reproduction in a plant refer to:
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results:The ink in Flask A has spread over a small area.The ink in Flask B is spreading more quickly than the ink in Flask A.The ink in Flask C has already spread evenly throughout the water.Which table shows possible temperatures for the water in each flask?How could you tell?
A drop of ink will spread faster as higher the temperature is. The higher the temperature, the more agitated the molecules will be, so they will move faster. So the mobility of the particles is related to their temperature.
So:
Particles in Flask C show the greatest mobility of the particles, this flask will have the highest temperature.
Particles in Flask A show the least mobility, this flask will have the lowest temperature.
Answer:
Flask A 10°C
Flask B 25 °C
Flask C 50 °C
The mobility of the particles is related to their temperature. The particles in Flask A show the least mobility, and the particles in Flask C show the greatest mobility.
when a piece of wood is on fire how is that fired created through a chemical reaction ?
The diagram below represents the reproductive cycle of a squirrel species with 40 chromosomes in each zygote.
A process that could be represented by letter A in the given diagram is
B) meiosis
A) mitosis
C) mutation
D fertilization
A process that could be represented by the letter A in the given diagram is fertilization. The correct option is D.
What is a reproductive cycle?It goes through four stages: menstrual, regenerative, proliferative, and secretory. The cycle duration is the time it takes from the first day of one menstruation to the first day of the following menstruation; most usual cycles last 28 days, but it can range from 21 to 40 days.
The average cycle lasts 28 days; however, cycles can last anywhere from 21 to 35 days. The menstrual cycle is triggered by the rise and fall of chemicals in your body known as hormones.
Therefore, the correct option is D, fertilization.
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How many electrons are found in the first energy level of phosphorus
Answer:
15 electrons
Explanation:
C6H12O6 + 6 O2(g) 6 CO2(g) + 6 H2O(g)
If 7.5 g of glucose react with 5.5 L of oxygen, which one is the limiting reagent?
C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O, If 7.5 g of glucose react with 5.5 L of oxygen, the limiting reagent is glucose.
The balanced reaction is given as :
C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O
mass of glucose = 7.5 g
molar mass of glucose = 180 g/mol
number of moles =mass / molar mass
= 7.5 / 180
= 0.041 mol
volume of oxygen = 5.5 L
density of oxygen = 1.42 g/ml
mass = density × volume
mass = 1.42 × 5.5
mass = 7.81
moles = mass / molar mass
= 7.81 / 32
= 0.244 mol
mass of reactant from each product:
now, glucose , mass of CO₂ = 0.041 × 6 × 44 = 10.84 g
oxygen, mass of CO₂ = 0.244 × 6 × 44 = 64.41 g
Since glucose gives the smaller amount of product glucose is a limiting reagent.
Thus, C₆H₁₂O₆ + 6O₂ ---> 6CO₂ + 6H₂O, If 7.5 g of glucose react with 5.5 L of oxygen, the limiting reagent is glucose.
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an amino acid that forms a solution with a ph of 3.0 as it is dissolved in distilled water has a side chain with what functional group?
An amino acid that forms a solution with a ph of 3.0 as it is dissolved in distilled water has a side chain with a carboxyl group.
A carbonyl and hydroxyl group are joined by a carbon atom to form a carboxyl group. The hydroxyl group is made up of oxygen and hydrogen bound together, whereas the carbonyl group is a carbon double-bonded to oxygen (O=H) (OH). The carboxyl functional group, also known as the carboxyl group, is produced when the carbon atom is attached to both the hydroxyl and carbonyl functional groups.
This characteristic enables this functional group to bind to a variety of molecules that are present in typical goods. As a result, a molecule made up of a carbonyl and a hydroxyl group joined by a carbon atom is described as having a carboxyl group.
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Infer the silica content of magma derived from partial melting of an igneous rock. Would it be higher, lower, or about the same as the rock itself? Explain
The silica content of magma derived from partial melting of an igneous rock is higher than the rock itself.
The composition of magma is depends upon the two factor : rock , that is melted to form the magma and the conditions in which magma is melted. In partial melting , some of the minerals are melted in the rock. The different minerals have the different melting points. The mineral which is higher in silica have lower melting point. so, Partial melting produce more silica as compared to the original one.
Thus, The silica content of magma derived from partial melting of an igneous rock is higher than the rock itself.
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In the reaction Ba(ClO₃)₂ --> BaCl₂ + 3O₂, how many valence electrons does barium (Ba) have? (1 pt)
*
1 point
0
1
2
7
In the reaction Ba(ClO₃)₂ → BaCl₂ + 3O₂, the valance electrons of Ba will be 2.
The given reaction is Ba(ClO₃)₂ → BaCl₂ + 3O₂
This reaction is a kind of decomposition reaction, barium chlorate breaks down into barium chloride and three moles of oxygen.
Barium possesses two outer shell/valency electrons, as seen by the subscripts of the components in the compound [tex]BaCl_{2}[/tex]. The two chlorine atoms receive two of these outside electrons from it. To comply with the octet rule, any chlorine gets one electron from barium.
Therefore, the valance electrons of Ba will be 2.
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If 3.4 atm of a gas at 644.4 K is compressed to 11.6 atm at constant volume. What is the new pressure of the gas?
The temperature in the final pressure formation is 2201.13K and the change in the pressure is 8.2atm
It is given that the initial pressure of the gas P₁ is 3.4atm and the initial temperature is T₁ 644.4K the final pressure of the gas is 11.6 atm. To find the final temperature, According to Gay Lussac's Law,
P₁/T₁ = P₂/T₂
On substituting the values of P₁,T₁ and T₂ we get,
3.4/644.4 = 11.6/T₂
0.005276 = 11.6/T₂
T₂ = 11.6/0.005276
T₂ = 2201.13K
Therefore the final temperature T₂ is 2201.13K when the pressure is changed from 3.4 atm to 11.6 atm
Thus the pressure change is calculated by,
ΔP = P₂ - P₁
ΔP = 11.6 - 3.4
ΔP = 8.2 atm
The change in pressure is 8.2atm
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why are mixtures and compounds different
Answer:
Mixtures are formed by mixing two or more substances physically such that no chemical reaction takes place between the components.
Jillian is looking over a Safety Data Sheet (SDS) for a pesticide at work. She notices it has the exclamation point pictogram shown below. What does this pictogram mean?
A red diamond with an exclamation mark inside
Chemicals that could cause toxicity to fish and other aquatic life
Chronic hazard that comes from long-term exposure
Health hazard that is less severe
Toxic poisoning after brief exposure
Answer:
This symbol indicates that hazardous products with this pictogram can cause certain health effects for example, skin irritation, eye irritation, and/or. skin sensitization.
Explanation:
suppose you add 20 ml of water and 20 ml of 0.50 g/l ca(oh)2 into a bottle. what is the concentration of ca(oh)2 in the bottle?
0.25g/L is the concentration of Ca(OH)2 in the bottle when 20 ml of water and 20 ml of 0.50 g/l Ca(OH)2 is added into a bottle.
What is Concentration?Concentration in chemistry is the measure of the constituent divided by the volume of the mixture.
What is Ca(OH)?Ca(OH)2 stands for Calcium hydroxide formed by the action of water on the calcium.it is used in forming a solution ,named limewater. it is also called as Slaked lime
Acc. to the given data:
c1=0.50g/l
v1=20ml=0.020L
c2=?
v2=20ml+20ml=40ml=0.040L
now we use the equation
c1v1=c2v2
rearranging the above equation
c2=c1*v1/v2
putting values
c2=0.50*0.020/0.040
c2=0.25g/l
Hence, 0.25g/L is the concentration of Ca(OH)2 in the bottle when 20 ml of water and 20 ml of 0.50 g/l Ca(OH)2 is added into a bottle.
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Need ASAP temperatures plummet with this type of weather front
the answer is cold front
To ___ is to make a statement that a product is or does more than is actually true.
Answer:
exaggerate
Explanation:
There are many possible verbs for this. I suggest exaggerate, but one many also consider:
"make a false claim"
"misrepresent"
Objective: Utilize units (dimensional analysis) as a guide to problem solving. Apply the concepts of mole
and stoichiometry to aqueous solutions and gases.
Question: For the reaction SrCO (s) + 2HCl(aq) → SrCl₂(aq) + CO₂(g) + H₂O(l), what volume of carbon
dioxide gas, measured at 1.05 atm and 298 K, may be produced by the reaction of 25,0 mL of 0.1072 M
HCI with excess strontium carbonate?
Include definitions, explanations, discussion of problem-solving process.
The volume of carbon dioxide gas produced will be 23.3mL
SrCO (s) + 2HCl(aq) → SrCl₂(aq) + CO₂(g) + H₂O(l)
Here concentration of the strontium carbonate is in excess and the concentration of HCl is 25mL having molarity 0.1072 M
Number of moles of HCl= mass/ molar mass,
Molar mass of HCl= mass/ Number of moles
Molar mass of HCl= 36.5
Mass of HCl from balanced equation= 2×36.5=73
Molarity= Number of moles/ volume
According to stoichiometry the moles of HCl is 2 and that of CO₂ is 1.
We know that,
PV =nRT
1.05× V= 1 ×0.0821× 298
V= 0.0821×298/ 1.05
= 23.3 mL
By ideal gas equation, volume of carbon dioxide is calculated as 23.3 mL.
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If you could help with writing the Keq with these equations please,
Answer:
[tex]K_{eq}\text{ = }\frac{[CO_2][H_2O]\placeholder{⬚}^2}{[CH_4][O_2]\placeholder{⬚}^2}[/tex]Explanation:
Here, we want to write the equilibrium constant expression
Generally, to write this, we exclude non-gaseous molecules
We simply put divide the concentration of the products (in square brackets) raised to the number of moles divided by that of the reactants raised to the number of moles too
For the given equation, we have the expression as:
[tex]K_{eq}\text{ = }\frac{[CO_2][H_2O]\placeholder{⬚}^2}{[CH_4][O_2]\placeholder{⬚}^2}[/tex]Why do isotopes undergo radioactive decay?
Isotopes undergo radioactive decay because thermodynamics generally governs the situation. Every atom strives to have the greatest degree of stability. When the number of protons and neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.
Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments.
Three Types of Radioactive Decay:
Alpha Decay:
When an alpha particle basically a helium nucleus with two protons and two neutrons is ejected, the parent's atomic number and mass number are reduced by two and four, respectively.
Beta Decay:
A stream of electrons from the parent, known as beta particles, is released during beta decay, and a neutron in the nucleus is changed into a proton. The new nucleus has the same mass number, but an additional atomic number of one.
Gamma Decay:
The atomic nucleus releases extra energy during gamma decay in the form of high-energy photons (electromagnetic radiation). The resultant nucleus takes on a more stable energy state while maintaining the same atomic number and mass number.
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