Significant Figures
How many significant figures does 0.002m have?
1
Given the balanced chemical equation 2H2O -> 2H2 + O2. If you start with 6 moles of H2O, how many moles of H2 will be produced?
Will produce 6 moles of H2.
What's the formula of zinc (II) carbonate?
ZnCO3
If you heat a liquid, does its density usually increase, decrease, or stay the same?
The density usually decreases.
Balance the following decomposition reaction KClO3 -> KCl + O2.
2KClO3 -> 2KCl + 3O2.
How many significant figures does 170g have?
2
Given the reaction: 2Al + 3Cl2 -> 2AlCl3, how many grams of aluminum chloride can be produced from 54.0 grams of Al?
266.93g
Name the formula rubidium chromate and the bond bond.
-Rb2CrO4
-Ionic
What happens to the density of most materials when their temperature increases?
Generally, the density of most materials decreases as their temperature increases because they expand when heated.
Balance the equation K + B2O3 -> K2O + B.
6K + B2O3 -> 3K2O + 2B
What is the answer to 4.4981cm - 1.26cm?
3.24cm
How many moles of lithium chloride will be formed by the reaction of chlorine with 0.046 mol of lithium bromide in the following reaction 2LiBr(aq) + Cl2(g) -> 2LiCl(aq) + Br2(l)?
0.046 mol LiCl
What's the name for each of molecular compound?
a. CO
b. H2S
c. SF6
d. N2O2
a. Carbon Monoxide
b. Dihydrogen Monosulfide
c. Sulfur Hexafluoride
d. Dinitrogen Trioxide
If you have a metal cube with a density of 8 g/cm³ at room temperature and you heat it up, causing its volume to increase by 2% while its mass remains constant, what is its new density?
7.84 g/cm³.
Balance the equation Na + NaNO3 -> Na2O + N2.
10Na + 2NaNO3 -> 6Na2O + N2
What is the answer to 12.439g + 9.375g + 15.7g?
37.514g
If 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce water, how many moles of water are produced?
2 moles of O2
What is the name for the compound Sr(C2H3O2)2?
Strontium Acetate
A liquid has a density of 1.2 g/cm³ at 20°C. If its density decreases to 1.1 g/cm³ at 60°C, what can you infer about the relationship between its density and temperature?
The density of the liquid decreases as the temperature increases, indicating that the liquid expands when heated.
Balance the equation C10H22 + O2 -> CO2 + H2O.
2C10H22 + 31O2 -> 20CO2 + 22H2O
What is the answer to 42.8g/2.6cm3?
16g/cm3
Ammonia is made industrially by reacting nitrogen and hydrogen under pressure at high temperature, and in the presence of a catalyst. The question is N2(g) + 3H2(g) -> 2NH3(g). If 4.0 mol of H2 react, how many moles of NH3 will be produced.
2.7 mol NH3
What's the name of the compound Be(HCO3)2?
Beryllium Hydrogen Carbonate
A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read that its density is 19.3 g/cm3. You measure the cube and find that it is 2 cm on each side, and weighs 40 g. What is its density? Is it gold? Should you buy it?
The cube is not gold, since the density (5.0 g/cm3) is not the same as gold (19.3 g/cm3).
Ca3(PO4)2 + SiO2 + C -> CaSiO3 + CO + P
Ca3(PO4)2 + 3SiO2 + 5C -> 3CaSiO3 + 5CO + 2P