Chemistry Lesson 1

Which of the following would be considered matter? Choose all that apply.

• light from the sun

• milk in a carton

• heat from a candle

• sound of booming thunder

• pebble on a beach

What do the readings on the digital scales indicate about the two pieces of clay?

• The two pieces of clay have the same mass.

• One piece of clay is heavier than the other.

• The two pieces of clay have different volumes.

• One piece of clay is denser than the other.

Can a substance be identified by only its mass or weight?

• Yes, mass or weight is sufficient to identify a substance.

• No, additional properties are needed to identify a substance.

• It depends on the type of substance.

• Mass and weight are irrelevant to substance identification.

The gas inside each balloon takes up the same amount of space. The difference in the mass of the balloons is only a few grams at most. The balloon resting on the table is filled with air. The floating balloon is filled with helium gas. Why might the helium balloon float while the other rests on the table?

• Helium has less mass in the same amount of space than air does, so the helium balloon sinks in air.

• Helium has less mass in the same amount of space than air does, so the helium balloon floats in air.

• Air has less mass in the same amount of space than does helium, so the helium balloon sinks in air.

• Air has less mass in the same amount of space than does helium, so the helium balloon floats in air.

Find the volume of this box using the formula for a rectangular prism. V = length × width × height V = ___ cm × ___ cm × ___ cm V = ___ cm³

• 300 cm³

• 250 cm³

• 350 cm³

• 400 cm³

Find the volume of the rock in the images by the amount of water that it displaces. Initial volume of water = ___ mL Volume of water with object = ___ mL Volume of object = volume of displaced water = Volume of water with object – initial volume of water = ___ mL – ___ mL = ___ mL or cm³

• 150 mL or cm³

• 200 mL or cm³

• 100 mL or cm³

• 250 mL or cm³

To Measure the mass of an object ...

• Use a balance scale

• Use a thermometer

• Use a ruler

• Use a stopwatch

What is the formula to calculate the volume of a rectangular prism given its length, height, and width?

• Volume = length + height + width

• Volume = length × height × width

• Volume = length × height

• Volume = length × width

Calculate the density of each rectangular prism. What is the density of a rectangular prism with a mass of 200g and a volume of 50cm³?

• 2 g/cm³

• 4 g/cm³

• 6 g/cm³

• 8 g/cm³

Use the water displacement method to determine the volume of the metal object. What should you ensure when recording its volume?

• The object is partially underwater.

• The object is completely underwater.

• The object is floating on the surface.

• The object is dry.