Chemistry Review

Rows in the Periodic Table are called

• Periods

• Groups/Families

• Cousins

• Metals

Columns in the Periodic Table are called

• Periods

• Groups/Families

• Cousins

• Metals

Which statement best describes the elements in Group 2

• All elements have 2 energy levels

• All elements have 2 protons

• All elements have 2 valence electrons and are metals

• All elements have 2 valence electrons and are nonmetals

Which group of the periodic table is composed of inert (not reactive) gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?

• 4g

• 5g

• 9g

• 14g

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?

• 17g
• 2g
• 7g
• None of the above

Why does this picture demonstrate the Law of Conservation of Mass?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Mass

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.