Test #3 Review Questions

Identify the coefficient in the formula below and tell what it means 8SO3

Identify the coefficient in the formula below and tell what it means 8SO3 TELLS THE NUMBER OF MOLECULES PRESENT- IN THIS CASE, THERE ARE 8 MOLECULES

2AgNO3 + CaCl2 → AgCl + Ca(NO3)2 Chemical equations like the one below represent… 2AgNO3 + CaCl2 → AgCl + Ca(NO3)2

2AgNO3 + CaCl2 → AgCl + Ca(NO3)2 Chemical equations like the one below represent… 2AgNO3 + CaCl2 → AgCl + Ca(NO3)2 CHEMICAL CHANGES

Identify the products and reactants in the equation below. 8S + 12O2 → 8SO3

REACTANTS PRODUCTS 8S + 12O2 → 8SO3 Identify the products and reactants in the equation below. 8S + 12O2 → 8SO3 REACTANTS PRODUCTS

Identify the subscript in the formula below and tell what it means 8SO3

Identify the subscript in the formula below and tell what it means 8SO3 TELLS THE NUMBER OF ATOMS PRESENT- IN THIS CASE, THERE ARE 24 ATOMS OF OXYGEN

temperature change gas produced color change The list below identifies what… temperature change gas produced color change

temperature change gas produced color change The list below identifies what… temperature change gas produced color change Signs that a chemical change has occurred

Determine if the equation below is balanced or unbalanced. Cu + CO2  CuCO2

Determine if the equation below is balanced or unbalanced. Cu + CO2  CuCO2 Cu = 1 C= 1 O = 2 Cu = 1 C= 1 O = 2 BALANCED

Elements in the same group have what in common?

Elements in the same group have what in common? Valence electrons Chemical properties

What is the Law of Conservation of Mass?

Matter cannot be created nor destroyed What is the Law of Conservation of Mass? Matter cannot be created nor destroyed

Where are non-metals located on the periodic table?

Right side of the stair-step Where are non-metals located on the periodic table? Right side of the stair-step

The formulas below represent examples of… CO2 H2O NaCl SO4

The formulas below represent examples of… CO2 H2O NaCl SO4 Compound molecules

How many atoms of Calcium and Chlorine are in the formula below? 7CaCl2

How many atoms of Calcium and Chlorine are in the formula below? 7CaCl2 7 CALCIUM ATOMS 14 CHLORINE ATOMS

How many molecules are present in the formula below? 4CuSO4

4CuSO4 How many molecules are present in the formula below?

Determine if the equation below is balanced or unbalanced. Cl + O2  Cl2O3

Determine if the equation below is balanced or unbalanced. Cl + O2  Cl2O3 Cl = 1 O = 2 Cl = 2 O = 3 UNBALANCED