MINOR Unit 1- Lesson 3 Changes in Matter

According to the Law of Conservation of Matter (Mass), 5 grams of hydrogen and 15 grams of oxygen will combine to form how many grams of water?

• 5 grams

• 10 grams

• 15 grams

• 20 grams

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If 12 grams of carbon react completely with 32 grams of oxygen, what will be the total mass of carbon dioxide formed according to the Law of Conservation of Mass?

• 20 grams

• 32 grams

• 44 grams

• 12 grams

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Bethany had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Bethany determine about the new substance formed by mixing the baking soda and pickle juice?

• A chemical reaction produced a solid.

• A chemical reaction produced a gas as shown by the fizzing and bubbling.

• No chemical reaction took place.

• Only a physical change happened.

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A student mixes two clear liquids together. After a few minutes, a yellow foamy solid forms. Which of the following is a conclusion that the student can draw based on these observations? The two clear liquids-

• were pure substances before they were mixed

• are toxic and should be handled with extreme caution

• have gone through a chemical change in which a new substance with different properties

  (a precipitate)was formed

• have been stored too long and are no longer good

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Which is an example of a chemical change?

• baking a cake
• freezing water
• crushing a can
• breaking an egg

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Is mixing ingredients like making cooking dough (flour+sugar+vanilla+butter+eggs+chocolate chips) a physical or chemical change?

• Physical

• Chemical

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An oreo cookie has a mass of 20 grams. It gets crushed into crumbs for a recipe. What is the mass of the crumbs?

• 15 grams

• 25 grams

• 20 grams

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Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

• 50 g
• 100 g
• 200 g
• 400 g

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Why does this picture demonstrate the Law of Conservation of Matter?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Matter

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Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?

• 
• 
• 
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