CAM-SCIENCE-Stage6 - UNIT 2: Materials: Properties and changes

In this chemical reaction, which ONES are the REACTANTS?

• Baking soda

• Sodium acetate

• Carbon Dioxide

• Water

What does this picture show?

• Dissolving

• Melting

• Boiling

• Evaporation

FILL IN THE BLANK:

The picture shows a particle model of a salt solution. In this particle model, when the solute is dissolved in the solvent, everything _____.

• is spread unevenly

• is spread evenly

• floats to the top

• stays at the bottom of the container

FILL IN THE BLANK:

The ________ is when the solute is mixed with the solvent.

• solution

• water

• fluid

• gel

FILL IN THE BLANK:

When a liquid changes to a solid, it is called _______.

• freezing
• boiling
• melting
• evaporation

What is the melting point of a substance?

• The melting point of a substance is the temperature at which it changes from a solid to a liquid state.
• The melting point of a substance is the temperature at which it changes from a liquid to a gas state.
• The melting point of a substance is the temperature at which it changes from a gas to a liquid state.
• The melting point of a substance is the temperature at which it changes from a liquid to a solid state.

When we mix magnesium metal with oxygen, we see a bright white flame and a white powder. Which is the product?

• oxygen

• white powder
• magnesium metal

• the flame

What is an example of an ELECTRICAL INSULATOR?

• graphite

• metal
• copper

• rubber

Which substance in the graph has the highest boiling point?

• Water

• Milk

• Chocolate

• Olive Oil

What is one way to measure the mass (weight) of gas?

• Using a ruler and measure the length of gas

• Using a scale or balance and contain the gas in a container

• Using a thermometer and measure the temperature of the air

• Using a stopwatch and time when the gas dissapears