Chemistry Pre-Assessment

Occurs when two or more substances react to form a new substance with different properties than the original substances

• Physical Property

• Chemical Property

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an Element?

• NaCl

• CO

• He

A change that affects one or more physical properties of a substance

• Chemical Property

• Physical Property

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-4

Describes characteristics that can be observed or measured without changing the identity of the substance

• Chemical Property

• Physical Property

• Chemical Change

• Physical Change

Metals such as tin, aluminum and gold can be pounded into a thin sheet.  This is a physical property of metals called

• Malleability

• Luster

• Density

• Solubility

Some chemistry students designed an experiment to see how different metals react with strong and weak acids. They have added small amounts of metal filings (copper and iron) to beakers containing different acids (concentrated and dilute sulfuric and hydrochloric acids). They have carefully recorded the experimental conditions. To observe the effects of how different metals react, the students should compare…

• A and B or E and F

• B and C or F and G

• A and D or E and H

• C and H or D and G

Tags

NGSS.MS-PS1-2

Some chemistry students designed an experiment to see how different metals react with strong and weak acids. They have added small amounts of metal filings (copper and iron) to beakers containing different acids (concentrated and dilute sulfuric and hydrochloric acids). They have carefully recorded the experimental conditions. Which of the following would be a correct procedure for the students to follow?

• Compare E and H to see if the reaction rate depends on the strength of the acid.

• Compare A and D to see if the reaction rate depends on which metal is added to the acid.

• Compare A and C to see if the reaction rate depends on the strength of the acid.

• Compare A and H to see if the reaction rate depends on which acid is used.

Tags

NGSS.MS-PS1-2

When baking soda is added to vinegar, the solution produces a gas (carbon dioxide). A student is trying to see if there is a relationship between the amount of vinegar added and the amount of gas produced. He added one gram of baking soda to different amounts of vinegar in a test tube, and collected the gas in a balloon. The data is graphed. What is a valid conclusion to draw from this data?

• The amount of gas continues to increase as the amount of vinegar increases

• Adding more than 10 ml of vinegar does not lead to additional gas production

• The amount of gas produced depends only on the amount of baking soda in the test tube

• There is no relationship between the amount of gas produced and the amount of vinegar added

Tags

NGSS.MS-PS1-2

When baking soda is added to vinegar, the solution produces a gas (carbon dioxide). A student is trying to see if there is a relationship between the amount of vinegar added and the amount of gas produced. He added one gram of baking soda to different amounts of vinegar in a test tube, and collected the gas in a balloon. The data is graphed. What would be a valid conclusion if the student had added vinegar in the range of 0 - 10 ml only?

• The amount of gas produced continues to increase as the amount of vinegar increases

• Adding more than 10 ml of vinegar does not lead to additional gas production

• The amount of gas produced depends only on the amount of baking soda in the test tube

• There is no relationship between the amount of gas produced and the amount of vinegar added

Tags

NGSS.MS-PS1-2

Density is defined as mass per unit volume or Solve the density equation for variable v.