1. Matter can be measured in many ways for specific purposes. Which measurement depends on the force of gravity it is not reliable measurement? A. Mass
B. Weight
C. Volume
D. Temperature

2. A bar of gold occupies a volume of 17.0cm3 and has a mass of 34.5g. What is the density of that bar of gold?
A. 2.1 ml/g
B. 2.0 g/cm3
C. 0.49 g/cm3
D. 0.51 ml/g

3. What volume of copper will weigh exactly 240g and have a density of 10.5g/cm3
A. 0.04g/cm3
B.18.2g
C.22.8g/cm3
D.21.4 cm3

Determine the reaction and balance the following equations urgent due in the morning

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?