Dissolving sugar in water is a physical change, even though it appears to disappear. Why?
When the water evaporates, the sugar remains.
100
How is the Statue of Liberty an example of chemical changes?
She is made of copper which should look like a shiny penny. However, oxidation has created copper oxide, creating the green color that we are all familiar with.
100
A lump of gold is placed in a graduated cylinder that already contains 48 mL of water. After adding the gold, the water level rises to 67mL. What is the volume of the gold?
19 mL
100
How many milliliters are in 7.2 dekaliters?
72,000 mL
200
Why does pumice, a rock, float on water?
Its density is lower than that of water thanks to millions of tiny air pockets.
200
When dry ice is exposed to regular temperatures, it goes directly from a solid to a gas. Why is sublimation a physical change?
Any change in the state of matter (solid, liquid, gas) is always a physical change.
200
True or False: Chemical properties describes matter based on its ability to change into new matter.
True
200
The minimum dimensions of a bar of silver is 25 cm x 11 cm x 6 cm. What is the minimum volume of a bar of silver in cubic centimeters?
1650 cubic cm
200
How many grams are in 773 mg?
0.773g
300
What is the density of a 0.21 g sample of lead that occupies 0.0186 cubic centimeters?
11.3 g/mL
300
What is a physical property?
The qualities of a substance that can be easily ascertained by measurement or the senses without making a new substance.
300
Reactivity is the ability of a substance to change into a new substance. Why is this not a physical property?
In observing physical properties, as with physical changes, the matter cannot be altered or made into other matter.
300
How many cubic centimeters would an 856 g sample of water occupy?
856 cubic cm
300
How many cubic centimeters are in 200 mL?
200 cc
400
What is the density of a gold bar that measures 290 mm x 85 mm x 45 mm and weighs 21.409 kg?
19.3 g/mL
400
What are two factors that can effect the measurement of density?
temperature and pressure
400
The wood from an oak tree has a density of 0.85 g/mL. What would be the volume (closest whole number) of a 752 gram sample?
885 mL (cubic centimeters)
400
How many millimeters are in 6.2 kilometers?
6,200,000 mm
500
What is the density of a sample of mercury with a mass of 4,872 g and a volume of 0.36 L?
13.5 g/mL
500
Name four physical properties of this softball.
Yellow, Hard, Sphere, Solid, Can't be dissolved in water, Can't be pulled into wire, Can't be rolled into a shape.
500
When water boils, the bubbles coming to the surface contain what gas?
Water vapor
500
When using a graduated cylinder to measure volume, where should readings always be taken?