21-22 MM 2.6 - Elorde Tuliao | Laabri | Nneɛma a ɛma wotumi yɛ ade

Please watch the video if you need to review this lesson:

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When solid water (ice) melts and becomes liquid water - what is happening to the molecules of the water?

A) The molecules in the liquid water move faster than the molecules in the solid ice.

B) The molecules in the liquid water move slower than the molecules in the solid ice.

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The diagram above shows ice cubes before and after they melt. Which answer is most likely to be true?

A) The weight of the ice cubes before they melt is the SAME as the weight of the liquid water.

B) The weight of the ice cubes before they melt is DIFFERENT from the weight of the liquid water.

Physical and Chemical Changes

Watch this video to learn about physical and chemical changes.

Add video after lesson

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Does this image show a physical or a chemical change?

A) Physical change - change that does not create a new substance (same substance)

B) Chemical change - change that creates a new substance

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Does this image show a physical or a chemical change?

A) Physical change - change that does not create a new substance (same substance)

B) Chemical change - change that creates a new substance

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Sugar and water were put on a scale separately to find the total mass.

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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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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.

A) Mass (weight) will increase (go up)

B) Mass (weight) will decrease (go down)

C) Mass (weight) will stay the same

Watch the video of sugar being dissolved in water to see what happens to the mass!

Add video after lesson

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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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Did the mass, or weight of the matter (sugar + water + containers) change?

A) Yes, the mass / weight changed when the sugar dissolved in the water.

B) No, the mass / weight did not change (stayed the same) when the sugar dissolved in the water.

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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?

A) Atoms were created (more matter)

B) Atoms were not created or destroyed (stayed the same)

C) Atoms were destroyed (less matter)

This leads us to our key understanding about what happens to atoms when matter goes through a change!

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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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What’s the mass (weight) when the ice is solid? _________________ grams Type number only!

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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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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?

A) The atoms in the ice increased to more ice atoms

B) The atoms in the ice decreased to less ice atoms

C) The atoms in the ice stayed the same amount

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