45 points PLEASE ANSWER 2. Calculate the density of a material that has a mass of 12.457 g and a volume of 13.5 cm3.

3. A student finds a rock on the way to school. In the laboratory he determines that the volume of the rock is 22.7 mL, and the mass in 39.943 g. What is the density of the rock?

4. The density of silver is 10.49 g/cm3. If a sample of pure silver has a volume of 12.993 cm3, what would the mass?

5. What is the mass of a 350 cm3 sample of pure silicon with a density of 2.336 g/cm3?

6. Pure gold has a density of 19.32 g/cm3. How large would a piece of gold be if it had a mass of 318.97 g?

7. The density of lead is 11.342 g/mL. What would be the volume of a 200.0 g sample of this metal?

8. The mass of a toy spoon is 7.5 grams, and its volume is 3.2 ml. What is the density of the toy spoon?

9. A mechanical pencil has the density of 3 grams per cubic centimeter. The volume of the pencil is 15.8 cubic centimeters. What is the mass of the pencil?

10) A screwdriver has the density of 5.5 grams per cubic centimeter. It also has a mass of 2.3 grams. What is the screwdriver's volume?

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?