Chemical Reactions: Chapter 1

The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The properties will likely be different because the repeating groups of atoms that make up each sample are different.

• The properties will likely be different because there are more repeating groups of atoms in Sample 2.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have two of the same types of atoms.

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The diagram above shows the repeating groups of atoms that make up two samples. Both samples are green gases at room temperature. Will the other properties of the two samples be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The other properties will be the same because the repeating groups of atoms that make up the two samples are the same.

• The other properties will be different because there are more repeating groups of atoms in Sample 2.

• The other properties will be the same because both samples are green at room temperature.

• The other properties will be the same because both samples are gases at room temperature.

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NGSS.MS-PS1-1

During a chemical reaction, atoms are

• created

• destroyed

• neither created or destroyed - just rearranged

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How many total atoms are in this compound? Al₂O₃

• 2

• 5

• 6

• 3

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A chemical reaction is when...

• Atoms are destroyed

• Atoms are created

• Atoms separate and rearrange to form new substances

• Atoms and molecules go on vacation and relax a little

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NGSS.MS-PS1-5

The tiny pieces that all matter-all the stuff in the world-is made of.

• atoms
• scale

• compounds
• chemicals

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What is a molecule?

• Two or more atoms bonded together
• One element
• One atom
• Solid, Liquid, Gas

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True or False: ethyl butyrate and isovaleric acid have all the same properties.

• True: They are made of the same atoms

• False: They are made of the same atoms that are in different patterns/order.

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NGSS.MS-PS1-1

True or False: Sample 1 and Sample 2 are the same.

• True

• False

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NGSS.MS-PS1-1

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

Answer explanation

When we crush the oreo, the pieces break apart, but we don't lose any so the mass stays the same!

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