Answers
Answer:
A. Cl₂
B. 51.36 g K
C. 245.3 g KCl
Explanation:
Balance the given chemical equation
K + Cl₂ ⇒ KCl
2 K + Cl₂ ⇒ 2 KCl
A. To find the limiting reagent, first convert the mass of each reactant to moles. The molar masses are 39.10 g/mol for K and 70.91 g/mol for Cl₂.
(180 g)/(39.10 g/mol) = 4.60 mol K
(120 g)/(70.91 g/mol) = 1.69 mol Cl₂
Now, convert moles of each reactant to moles of the product. You can do this by using the mole ratio in the balanced chemical reaction. The reactant with the smallest moles of product is the limiting reagent.
(4.60 mol K) × (2 mol KCl/2 mol K) = 4.60 mol KCl
(1.69 mol Cl₂) × (2 mol KCl/1 mol Cl₂) = 3.29 mol KCl
Cl₂ is the limiting reagent.
B. You need to find out how much excess K you will have. Since Cl₂ is the limiting reagent, you will only make 3.29 mol of KCl. Convert this value to moles of K using the mole ratio.
(3.29 mol KCl) × (2 mol K/2 mol KCl) = 3.29 mol K
Now convert moles of K to grams. The molar mass is 39.10 g/mol.
(3.29 mol K) × (39.10 g/mol) = 128.64 g K
This is how much K will be consumed in the reaction. Subtract the total amount of K by the amount that will be consumed.
180 - 128.64 = 51.36 g
There will be 51.36 g of excess K.
C. You know that you will produce 3.29 mol of KCl based on previous calculations. Convert this to grams. The molar mass is 74.55 g/mol.
(3.29 mol) × (74.55 g/mol) = 245.3 g KCl
You will produce 245.3 g of KCl.
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1. Biology is the study of
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Answer: biology is the study of life
Source:trust me bro
As you stare out the window after a rainstorm, you notice water drops on the window. Explain why those drops don’t stream down the window
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575/2000 in ratio please send me photos of this answer
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Answer:
23 : 80
Not sure
No time for pictures
Answer:
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Refer to above attachment...
How many atoms total are in this formula? 2 Ni3 (H3O4)2
Answers
Answer:
30 atoms
Explanation:
2Ni(H₃O₄)₂
There are two nickel, twelve hydrogen and sixteen oxygen atoms are present in given formula.
The given formula is actually having two moles of Ni(H₃O₄)₂.
Thus in two mole total number of atoms are = 2+12+16 =30 atoms
In one mole there are one nickel atom, six hydrogen atom and eight oxygen atoms are present.
Thus in one one mole total number of atoms are = 1+6+8 =15 atoms
However this compound does not exist.
What factors decrease the transfer of thermal energy?
ASAP
Answers
Answer:
What 3 factors influence the amount of thermal energy in an object, and how do they each affect it? Mass, temperature, and phase. More mass, more Thermal Energy. Higher temperature, more Thermal Energy.
ASAP=abbreviation. As soon as possible. 'fill in your form and send it to us ASAP' More example sentences.
8
Which of the following is a nonmetal?
OA. aluminum (AI)
OB. potassium (K)
OC. chlorine (CI)
OD. calcium (Ca)
Answers
Answer:
chlorie (Cl)
Explanation:
aluminum is a metal.
potassium is a metal.
calcium is a metal.
But chlorine is a nonmetal.
brainlest??
Question 14 On Mars, the element zircon has two isotopes, Zr156 and Zr160.84% of a sample is Zr156, which has an atomic mass of 156.8 amu, and 16% Zr160, which has an atomic mass of 159.4 amu. What is the average atomic mass of zircon on Mars? 157.2 amu 158.0 amu 159.2 amu 162.4 amu
Answers
Answer:
Option A is correct = 157.2 amu
Explanation:
Given data:
Percentage abundance of Zr-156 = 84%
Atomic mass of Zr-156 = 156.8 amu
Percentage abundance of Zr-160 = 16%
Atomic mass of Zr-160 = 159.4 amu
Average atomic of Zr on Mars = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (84×156.8)+(16×159.4) /100
Average atomic mass = 13171.2 + 2550.4 / 100
Average atomic mass = 15721.6 / 100
Average atomic mass = 157.2 amu.
How do planetary geologists study rocky planets?
Answers
Answer:
Planetary geologists study rocky planets by comparing them to Earth.
Explanation:
A planetary geologist is someone who studies how other planets form and evolve over time. Planetary geologists work in the field, laboratory, and -indirectly- in outer space through imagery and other data returned by spacecraft.
Please mark me the brainliest!?!
describe the valence electrons in nitrogen and how it could bond to other atoms.
Answers
There are five valence electrons in nitrogen atom and they always participate in covalent bond formation.
Atoms participate in;
Ionic bondingCovalent bondingMetallic bondingThe type of bonding that atoms of elements are involved in depends on the number of electrons in the valence shell of each of the bonding atoms.
Recall the elements that have very few electrons in their valence shell(metals) often form ionic bonds with other elements whose valence shell are less than the stable octet by one or two electrons.
On the other hand, nonmetals having more electrons on their valence shell often share electrons in a covalent bond.
Nitrogen is a nonmetal that has five valence electrons. Nitrogen often shares three of these electrons with atoms of other elements in a covalent bond.
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What is the KE at 1 m?
Answers
Answer:
K.E. = 1/2 m v2
Explanation:
What types of epithelial cells would you expect to find in an area of the body where diffusion of nutrients needs to occur?
1) Cuboidal
2) Columnar
3) Squamous
Answers
Answer: C. Squamous
Explanation:
I got it right on my test...lol
The type of epithelial cells that would be found in an area of the body where diffusion of nutrients needs to occur is squamous.
Epithelial cells refer to the cells that are vital in the lining of the surface of the body. Epithelial cells can be found on the blood vessels, skin, and urinary tract.It should be noted that epithelial cells are important as they act as a protective barrier and help in stopping viruses from getting inside the human body.It should be noted that squamous can be found in an area of the body where diffusion of nutrients needs to occur. They're flat cells and they are usually thin and resembles the scale of fishes.In conclusion, squamous can be found on the surface of the skin.
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How widespread are the trilobite fossils?
Answers
Answer:
Trilobite fossils are found worldwide, with many thousands of known species. ... Because of their diversity and an easily fossilized exoskeleton, they left an extensive fossil record with some 17,000 known species spanning Paleozoic time.
Let me know if this help
Explanation:
Depending on the area and the movement of the plates, the fossils would be kind of close to each other. Maybe about a couple feet at the farthest in one area, almost everywhere.
beeans beans beans beans beans!!
Answers
Answer:
points go brrrrrr
Explanation:
Answer:
Beans.
Explanation:
Which two particles are found in the nucleus of an atom?
Answers
Answer:
Protons and neutrons
Answer:
Protons and Netrons
hope this helps
Which of the following observations is evidence used to imply that a chemical reaction has occurred? a. gas evolution b. a precipitate forms c. the color changes d. the temperature changes e. the odor changes f. a sound is produced g. change in taste
Answers
Answer:
burgers
Explanation:
Chemical reaction or chemical change is characterized by gas evolution, precipitate formation and the color changes.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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A rock can be broken down into different kinds of substances by physical processes. No chemical reactions are
needed to separate different parts of a rock into pure substances. This is because a rock is a
A. compound
B. element
C. mineral
D. mixture
Answers
PLS HELP ASAP
salt water is a pure substance
true or false?
Answers
Answer:
false
Explanation:
salt water cannot be classified as a substance because it's composition can vary
The unit cm2 is used to measure:
Answers
Answer:
While calculating the surface area of an object, the unit of measurement becomes cm2
Explanation:
Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation:
(
)CaSO4 → (
)O2 + (
)CaS
Answers
Answer:
Explanation:
1,2,1
Answer:
here's the answer
Explanation:
What is a bone charcoal
Answers
Answer:
Bone char is a porous, black, granular material produced by charring animal bones. Its composition varies depending on how it is made; however, it consists mainly of tricalcium phosphate 57–80%, calcium carbonate 6–10% and carbon 7–10%. It is primarily used for filtration and decolorisation.
Can someone help me with this, if so just put the letters down in the order that seems right.
Answers
The element sodium has an atomic number of 11and a mass number of 23 how many protons neutrons and electrons does one atom contain
Answers
Explanation:
Element sodium (Na) has an atomic number of 11
mass number = 23
proton = 11
electron = 11
Neutron = mass number - atomic number
= 23 - 11
= 12
Can someone please help me no false information plssss
Answers
Answer:it's the third one
Explanation:
Among the composition of DNA,do you one is more important than other? why or why not?
Answers
Answer:
blood sample of each others
helllllllppppppp meeeee pweaaseee
Answers
they get closer together
lead has a density of 11.4 g/cm^3 . what is the density in kilograms per cubic meter in scientific notation?
Answers
Answer:
d = 11400 kg/m³
Explanation:
The density of lead is 11.4 g/cm³
We need to convert the density in kg/m³ in scientific notation.
We know that,
1 kg = 1000 g
1 cm = (1/100) m = 0.01 m
Density,
[tex]d=11.4\ \dfrac{g}{cm^3}\\\\=11.4\times \dfrac{(\dfrac{1}{1000})\ kg}{(0.01\ m)^3}\\\\=11400\ kg/m^3[/tex]
So, the density of the lead is 11400 kg/m³.
The accepted density of copper is 8.96 g/mL. Calculate the percent error of a student’s measurement which resulted in a density of 8.86 g/mL.
Answers
Answer:
The answer is 1.12 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual density = 8.96 g/mL
error = 8.96 - 8.86 = 0.1
We have
[tex]p(\%) = \frac{0.1}{8.96} \times 100 \\ = 1.1160714...[/tex]
We have the final answer as
1.12 %Hope this helps you
pls help
What is the chemical formula for the following compound?
Br : ca: (Br:
CaBr2
OCaBr
Ca2Br
O None of the above
Answers
Answer:
CaBr2
Explanation:
There is one calcium atom and 2 Bromine atoms.
Hope this helps!
how atoms differ from others, pls is so urgent
Answers
Answer:
There are more than a hundred different atoms, but each element contains only one kind of atom.
Atoms are what make one element different from another.
So what makes one atom different from another?
The Greeks thought atoms could not be divided into anything smaller but they were wrong! Every atom can be divided into three different components - protons, neutrons and electrons.
The nucleus, or centre of an atom, is made of protons, (which have a positive electrical charge) and neutrons, which are neutral (in other words, they have no charge).
Electrons, which have a negative charge, move around the centre of the atom.
Normally, the number of electrons is equal to the number of protons, which makes atoms electrically neutral.
The number of protons in an atom is the defining feature of an atom. It's what makes one element different from another. The number of protons in an atom is called its atomic number. Oxygen atoms have 8 protons. So the atomic number of oxygen is 8.
All the elements in the universe are arranged according to their atomic number in the periodic table.
Atomic mass
If you add together the number of protons (or atomic number) and the number of neutrons in the nucleus of an atom, you can calculate the mass of the atom. Helium (He), atomic number two, has two protons and two neutrons. So the mass number for Helium is 4.
Isotopes
Atoms with the same number of protons but different numbers of neutrons are called isotopes. Uranium-238 and uranium -235 are two different isotopes of uranium. Uranium- 238 has a mass number of 238. Uranium-235 has a mass number of 235. So uranium-238 has more neutrons than uranium-235. But they are still both atoms of uranium because they have the same number of protons.
Consider the following intermediate chemical equations.
2 equations: upper P subscript 4 (s) plus 3 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 6 (s). Delta H 1 equals negative 1, 640 kilojoules. 2: upper P subscript 4 upper O subscript 10 (s) right arrow upper P subscript 4 (s) plus 5 upper O subscript 2 (g). Delta H 2 equals 2, 940.1 kilojoules.
What is the enthalpy of the overall chemical reaction Upper P subscript 4 upper O subscript 6 (s) plus 2 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).?
-4,580 kJ
-1,300 kJ
1,300 kJ
4,580 kJ
Answers
Answer:
-1300
Explanation:
Answer:
-1300
Explanation:
trust