Please watch the video if you need to review this lesson:
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Question 1
1.
When solid water (ice) melts and becomes liquid water - what is happening to the molecules of the water?
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Question 2
2.
The diagram above shows ice cubes before and after they melt. Which answer is most likely to be true?
Physical and Chemical Changes
Watch this video to learn about physical and chemical changes.
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Question 3
3.
Does this image show a physical or a chemical change?
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Question 4
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Does this image show a physical or a chemical change?
Sugar and water were put on a scale separately to find the total mass.
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Question 5
5.
What’s the total mass (of the sugar, water, and the containers) when the sugar and water are separate? __________ grams. Type number only!
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Question 6
6.
Predict what will happen to the mass after the sugar is dissolved in the water - will it increase, decrease or stay the same?. Explain why you made that prediction.
Watch the video of sugar being dissolved in water to see what happens to the mass!
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Question 7
7.
Based on the video, what’s the total mass (of the sugar, water, and the containers) after the sugar was dissolved (mixed) in the water? __________ grams Type number only!
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Question 8
8.
Did the mass, or weight of the matter (sugar + water + containers) change?
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Question 9
9.
Are atoms in the matter (sugar + water + containers) created (more matter) and destroyed (less matter), or do they stay the same when the sugar dissolved in water?
This leads us to our key understanding about what happens to atoms when matter goes through a change!
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Question 10
10.
Jaivin mixes 5 pounds of white paint and 4 pounds of red paint. How much would the pink paint he makes weigh? _________________ pounds Type number only!
Let’s investigate by looking at what happens to the MASS when water goes through a phase change - from solid ice to liquid water.
Ice was put in a measuring cup and a scale was used to find the mass. Answer the questions using the before and after photos below.
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Question 11
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What’s the mass (weight) when the ice is solid? _________________ grams Type number only!
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Question 12
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What’s the mass (weight) when the ice has melted into liquid water? _________________ grams Type number only!
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Question 13
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How does this experiment support our key concept about the conservation of matter (matter is not created or destroyed)? What happened to the atoms in the ice?
