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
MASS is the amount of matter in an object or substance. Today, we will measure mass in grams ( g ).
A physical change is a change in size, shape, or state of matter that does NOT create a new substance.
A chemical change is a change that occurs to matter and a new substance is created.
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Question 3
3.
Does this image show a physical or a chemical change? How do you know?
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Question 4
4.
Does this image show a physical or a chemical change? How do you know?
Our Investigation Question
Experiment #1 - Dissolving Sugar in Water
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)?
__________ grams
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Question 6
6.
Predict what will happen to the mass after the sugar is dissolved in the water - will the mass increase, decrease or stay the same?. Explain why you made that prediction.
The mass will ______ because ______
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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
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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.
When the sugar dissolved in water, are the 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, atoms in the matter (sugar + water + containers) _______
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Question 10
10.
Explain your answer in Question 9.
Atoms were ________ because ________
Check Your Understanding
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Question 11
11.
Jaivin mixes 5 pounds of white paint and 4 pounds of red paint. How much would the pink paint he makes weigh? ______ pounds
EXPERIMENT #2 - Ice Cubes Melting
EXPERIMENT #2 - Ice Cubes Melting
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 12
12.
What’s the mass (weight) when the ice is solid?
______ grams
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Question 13
13.
What’s the mass (weight) when the ice has melted into liquid water?
______ grams
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Question 14
14.
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?
Exit Ticket
Mixing Baking Soda and Vinegar
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Question 15
15.
The second scale (scale on the right) does not have a mass showing.
What would the mass (weight) be of second scale? Type a number.
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Question 16
16.
Leslie places 5 pounds of ice in a 1 pound bucket with a lid. The next day, she notices all the ice has melted. When she weighs the bucket with the melted ice, what will it most likely weigh?