Chem Study Guide Review

What do elements in families or columns on the Periodic Table have in common?

They have similar chemical properties.

What do elements in rows or periods on the Periodic Table have?

Repeating or cyclic chemical properties.

What is the name of the compound KBr?

Potassium bromide.

What is the chemical formula for Silicon tetrachloride?

SiCl4.

What is the neutral chemical formula for Diphosphorus pentoxide?

P2O5.

Which of the following is a polyatomic ion?

PO4-3.

What type of reaction is C + O2 -> CO2?

Combustion.

What is the value of Avogadro's number?

6.02 x 10^23.

What is standard volume for a gas at STP?

22.4 L.

How many moles are in 98.3 g of CO2?

2.23 mol.

What happens to the pressure if the volume of a gas decreases?

Increase pressure.

In an endothermic reaction, do the reactants or products have more energy?

Products.

What is the sign of the enthalpy change for an endothermic reaction?

Positive.

What is activation energy?

Energy needed to start a reaction.

How do catalysts speed up reactions?

They lower the amount of activation energy needed.

What ions are produced when HCl ionizes in water?

H+ + Cl-.

What is half-life?

The time it takes for 1/2 the mass to decay.

Which type of radiation is represented by the symbol 4/2 He?

Alpha.

What nuclear process do power plants use to produce energy?

Fission.

What is the approximate pH range for a strong acid?

0-2.

Where might you commonly find Acetic acid?

Vinegar.

What is a precipitate?

A solid produced in a reaction.