G8 - Practice Test

Which of the following is NOT evidence of a chemical change?

• a) Formation of a precipitate
• b) Change in state of matter
• c) Mixing of substances
• d) Change in temperature

You mix baking soda and vinegar in a container, and it starts fizzing and producing bubbles. What type of change is happening, and what is the evidence of that change?

• a) Physical change; change in temperature
• b) Chemical change; formation of gas and effervescence
• c) Physical change; change in color
• d) Chemical change; change in state

You heat a piece of wax, and it melts into a liquid. What type of change is happening, and what is the evidence of that change?

• a) Chemical change; formation of gas
• b) Physical change; change in color
• c) Physical change; change in state
• d) Chemical change; change in temperature

You burn a piece of paper, and it turns into ash. What type of change is happening, and what is the evidence of that change?

• a) Chemical change; formation of ash
• b) Physical change; change in state
• c) Chemical change; change in color
• d) Physical change; change in temperature

You dissolve sugar in water, and the sugar completely disappears. What type of change is happening, and what is the evidence of that change?

• a) Physical change; change in color
• b) Chemical change; change in state
• c) Physical change; sugar was dissolved in water
• d) Chemical change; disappearance of the sugar

You cut an apple in half, and it starts to turn brown after a while. What type of change is happening, and what is the evidence of that change?

• a) Physical change; change in state
• b) Chemical change; formation of a new substance
• c) Chemical change; change in temperature
• d) Physical change; change in color

You leave a glass of water outside, and over time, it evaporates and form mist in the surroundings, leaving the glass empty. What type of change is happening, and what is the evidence of that change?

• a) Chemical change; formation of a gas
• b) Physical change; change in color
• c) Physical change; change in state
• d) Chemical change; change in temperature

You mix iron filings and sulfur powder, and a chemical reaction occurs, forming a compound with different properties. What type of change is happening, and what is the evidence of that change?

• a) Physical change; change in temperature
• b) Chemical change; formation of a new substance
• c) Physical change; change in state
• d) Chemical change; change in color

You freeze water, and it turns into ice. What type of change is happening, and what is the evidence of that change?

• a) Chemical change; formation of ice
• b) Physical change; change in temperature
• c) Physical change; change in state
• d) Chemical change; change in color

You mix two clear liquids together and observe a cloudy precipitate forming at the bottom of the container. What type of change is happening, and what is the evidence of that change?

• a) Physical change; change in state
• b) Chemical change; change in temperature
• c) Physical change; change in color
• d) Chemical change; formation of a precipitate