Each known element? be broken down into any simpler substances.

How many H atoms in 2.3 moles of CH4?

What is likely to happen if we can't control our experiment properly? A. Our hypothesis will have to be changed. B. We will need to do other experiments and collect more data. C. Our hypothesis will be well-supported by the data we collect. D.

A chemistry student at a yard sale considers buying a silver coin. The student asks permission to test the coin to determine whether it is pure silver. They find that the coin has a mass of 15.79g. Submerging the coin in 12.

Most reactions between an acid and a base form a salt and water. Which term describes an acid-base reaction? A. single-replacement reaction B. decomposition C. double-replacement reaction D. synthesis

4PCl3 → P4 + 6Cl2. Balance the equation and determine the mass in grams of chlorine that would be formed if 25 grams of PCl3 (molecular mass = 137.32 g/mol) decompose.

A cube has a mass of 100 grams and it's density is determined to be 1g/cm^3. The volume of the cube must be

The oxide of titanium, TiO2 is used as a "whitener" in toothpaste. It is obtained from the ore iron (II) titanate, FeTiO3. What is the change, if any, in the oxidation number (oxidation state) of titanium in the reaction

What happened to the mars Climate Orbiter and why? How much money did NASA lose from this incident?

How many bonds are present in HCI? a) 1 b) 3 c) 4 d) 2

Determine the number of moles 1) 20g Na and 2) 34g H2O