18. The mass of a metal ring is 116 g. You fill a graduated cylinder with 15 mL of
water and drop the ring into the cylinder. The water level rises to the 26 mL mark.
Which of the following could be the composition of the object?
Metal Composition Density (g/cm)
Silver
10.5
8.
Rhodium
12.41
Gold
19.32
Platinum
21.5
A
C
D.
19. Which of the following is an example of a chemical change?
1 The bread starts to rise in the oven.
II The egg white starts to turn into an opaque solid on the frying pan
III Steam from the shower starts to condense on the bathroom mirror.
A. I and II only
C. II and III only
B. I and III only
D. I, II, and III
20. Which of the following is an example of a physical change?
A. The silver ring is starting to tarnish.
B. The antacid helps calm your stomach.
C. A clump of clay is moulded into a bowl.
D. Milk goes sour when it is left out for days.