Intro to Chem Part 2

Figure A shows a beaker containing water, sand, and salt. The salt is totally dissolved in the water. Figure B shows the contents of the beaker being poured through filter paper in a funnel over a flask. Figure C shows the same flask after sitting at room temperature for 15 days. After 15 days, the flask contains only solid salt particles. the insoluble substance is

• sand

• salt

Tags

NGSS.MS-PS1-2

Figure A shows a beaker containing water, sand, and salt. The salt is totally dissolved in the water. Figure B shows the contents of the beaker being poured through filter paper in a funnel over a flask. Figure C shows the same flask after sitting at room temperature for 15 days. After 15 days, the flask contains only solid salt particles. A solution can form with the mixture of

• sand,salt and water

• salt and water

• water only

• sand and salt

• sand and water

Tags

NGSS.MS-PS1-2

Figure A shows a beaker containing water, sand, and salt. The salt is totally dissolved in the water. Figure B shows the contents of the beaker being poured through filter paper in a funnel over a flask. Figure C shows the same flask after sitting at room temperature for 15 days. After 15 days, the flask contains only solid salt particles. Why are the contents of the flask in figure B are classified as a mixture.

• because it is the physical combination of two or more substances. Can be separated by filtration and settling.

• because it is the chemical combination of two or more elements. Cannot be physical separated.

Two friends are melting chocolate to make fudge. They do not have much time and want the chocolate to melt faster. Suggest TWO ways they can get the chocolate to melt faster.

• heat it more by putting it into direct sunlight

• crush it into smaller pieces

• shade it

• make it colder

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NGSS.MS-PS1-4

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One example of a physical change is

• burning paper.

• baking cookies

• the rusting of iron

• breaking your pencil when you are mad

Which of the following is an example of a chemical property?

• hardness

• color

• melting point

• reactivity

Which process changes matter into one or more new substances?

• physical change

• chemical change

• conservation

• freezing

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NGSS.MS-PS1-2

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Water vapor in the air turns to liquid water in the form of rain. This is an example of a

• physical change.

• chemical change.

• chemical equation.

• chemical formula.

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NGSS.MS-PS1-4

What happens when chemical bonds break and new bonds form?

• a physical change

• a chemical reaction

• matter is destroyed

• surface area increases

Tags

NGSS.MS-PS1-2

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The only sure evidence of a chemical reaction is

• the formation of a gas

• a color change

• the production of new materials

• changes in properties.

Tags

NGSS.MS-PS1-2