Balance the following reaction: FeCl2 + O2 ---> FeO + Cl2
2 FeCl2 + 1 O2 ---> 2 FeO + 2 Cl2
The formula for calcium phosphate is
Ca3(PO4)2
Water molecules (H2O) in ice have __________ kinetic energy (motion) than H2O molecules in the liquid or vapor state of matter
less
If 0.274 moles of a substance weigh 62.5 g what is the molar mass of the substance, in units of g/mol?
2.28 x 10 2 g/mol
What is the formula for the ionic compound formed by calcium ions and nitrate ions?
Ca(NO3)2
Determine the number of moles of aluminum in 96.7 g of Al.
3.58 mol
A magnesium ion, Mg2+, has
12 protons and 10 electrons
Kinetic energy of molecules describes their ___________.
motion, including their speed and the ways that they move
Which is the percent composition of bromine in the compound NaBr?
77.7%
Which is the correct molar mass of for the compound FeSO4?
151.85 g/mol
Which of these quantities does NOT represent 1.00 mol of the indicated substance?
26.0 g Fe
The correct name for NH4NO3 is
ammonium nitrate
What happens to the volume of a balloon if you put a balloon inside of a vacuum chamber and decrease the pressure inside?
It gets larger
What is the average mass, in grams, of one atom of iron?
9.28x10 -23 g
How many moles of CF4 are there in 171 g of CF4?
1.94 mol
How many molecules are in 4.39 g of CO2?
6.01x10 22 molecules
The mass of 1.21x10 20 atoms of sulfur is
0.00644 g
A covalent bond is between
two nonmetals
What type of reaction is shown?
MnOH + 2 KCl ---> MnCl2 + KOH
double replacement
Which of the following statements is most accurate?
All of the above.
What distinguishes the findings of Dalton from the findings of Democritus?
Dalton proved experimentally that atoms exist whereas Democritus believed in them based on philosophy.
Which is the charge that results when phosphorus becomes an ion?
3-
Which is the correct measurement for location marked by the arrow?
51.8
Which term is described as the lowest whole-number (most simplified) ratio of elements in a compound?
empirical formula
The chemical formula for iron(II) nitrate is
Fe(NO3)2
Which element has a molar mass of 30.974 g/mol
phosphorus
What is the percent mass of fluoride (F) in potassium fluoride (KF)? The molar mass of potassium (K) is 39.0983 and the molar mass of fluorine (F) is 18.998403
32.7%
An oxide ion, O2, has:
8 protons and 10 electrons
According to Charles' Law, volume and temperature are directly proportional. This means that _________
as temperature increases, volume increases
The correct name for KOH is
Potassium hydroxide
What description best describes the work of Democritus?
Democritus philosophized about the existence of atoms and believed that they exist.
What is the formula for the ionic compound formed by magnesium and iodine?
MgI2
Group 16 (also known as 6A) elements tend to acquire which charge when they form ions?
2-
What is the molar mass of acetaminophen, C8H9NO2?
151 g/mol
Based on the mole ratios of the substances in a chemical reaction shown, which is the correct equation for the chemical reaction?
3A + 2B ---> C
In which phase are the molecules of a sample held rigidly together?
Solid
Which value has only 4 significant digits?
6.930
Which of the following is a synthesis reaction?
2CO + O2 ---> 2CO2
Consistent with vanadium being a transition metal, the name for VSO4 should be
Vanadium (II) sulfate
The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O. The molar mass of this compound is 284.5 g/mol. What is the molecular formula of the compound?
C18 H36 O2
If I have 3.25x10 23 molecules of magnesium, how many milligrams of magnesium is that?
13,121.4701 mg
According to Boyle's Law, pressure and volume are inversely proportional. This means that
as volume increases, pressure decreases.
How many molecules are there in 8.0 g of ozone, O3?
1.0x10 23 molecules
All room temperature matter is composed of atoms and molecules that are always moving.
True
The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is
UF6
Which of the following reactions is a combustion reaction?
C3H8 + 5O2 ---> 3CO2 + 4H2O
Which of the following is a transition metal?
None of the other choices
Calculate the molar mass of potassium permanganate KMnO4-
158 g
What is the mass of 0.0250 mol P2O5?
3.55 g