1. Monday 1-4-2016 Which ratio of reactants to products supports the law of conservation of mass? A 2:1 because the mass of the reactants is halved during the reaction B 1:2 because the mass of the reactants is doubled during the reaction C 1:1 because the mass of the reactants before the reaction is equal to the mass of the products after the reaction D 1:0 because the mass of the reactants is completely used up during the reaction so the products have no mass after the reaction

2. Tuesday 1-5-2016 Calcium carbonate(CaCO 3 )is considered a compound because it is made up of two or more A molecules. B elements. C gases. D solids.

3. Wednesday 1-6-2016 How are elements arranged on the periodic table? A by mass, from lowest to highest B by number of protons, from lowest to highest C by date of discovery or creation, from oldest to newest

4. Thursday 1-7-2016 Element X reacts with element Y to form 250 g of XY. If no reactants are left over, which are most likely the amounts of X and Y in the reaction? A 75 g of X and 175 g of Y B 95 g of X and 115 g of Y C 100 g of X and 200 g of Y D 150 g of X and 300 g of Y

5. Friday 1-8-2016 Each of the elements in the periodic table has a specific number. What does this number represent? A the half-life B the number of neutrons C the number of protons

6. Monday 1-11-2016 Structural differences between different chemicals can be represented in models of the particles. Which drawing best represents a compound? A.C. C. B. D.

7. Tuesday 1-12-2016 As a glass of carbonated water is at room temperature, small bubbles are observed to form on the inside surface of the glass. Which best describes the identity of the bubbles observed on the inside surface of the glass? A The bubbles are oxygen gas from the water. B The bubbles are hydrogen gas from the water. C The bubbles are carbon dioxide used to carbonate the water.

8. Wednesday 1-13-2016 Which best represents a balanced equation? A Mg(s) + 2O 2 (g) 2MgO(s) B Mg(s) + O 2 (g) 2MgO(s) C 2Mg(s) + O 2 (g) 2MgO(s )

9. Thursday 1-14-2016 Which does silicon dioxide (SiO 2 ) represent? A element B compound C homogeneous mixture D heterogeneous mixture

10. Friday 1-15-2016 Which is the most reactive group of nonmetals? A Group 1 B Group 5 C Group 17 D. Group 18