Sc, 8, P, 8, 9

The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?

• Mixture

• Liquid

• Compound

• Element

The juice we drink contains different individual solids and liquids (mostly sugars and acids). Which of the following correctly describes the juice we drink?

• Mixture

• Liquid

• Compound

• Element

When salt is dissolved in water, the resulting solution is a...

• element

• compound

• homogeneous mixture

• heterogeneous mixture

When salt, vinegar and spices are mixed in oil, the resulting solution is a...

• element

• compound

• homogeneous mixture

• heterogeneous mixture

Coffee is a solution made by placing coffee grounds into a paper filter and then pouring very hot water over the coffee grounds. Which statement below correctly identifies the solute and the solvent of this solution?

• The coffee grounds are the solvent and water is the solute

• The coffee grounds are the solute and the water is the solvent

• The coffee grounds are the solvent and the paper filter is the solute

• The coffee grounds are the solute and the paper filter is the solvent

Tea is a solution made by placing tea leaves into a paper filter and then pouring very hot water over the tea leaves. Which statement below correctly identifies the solute and the solvent of this solution?

• The tea leaves are the solvent and water is the solute

• The tea leaves are the solute and the water is the solvent

• The tea leaves are the solvent and the paper filter is the solute

• The tea leaves are the solute and the paper filter is the solvent

Based on this table, which of the following statements is correct?

• Orange juice is more acidic than black coffee

• Stomach acid is more basic than orange juice

• Bleach is more acidic than household ammonia

• Toothpaste is more basic than household ammonia

Based on this table, which of the following statements is correct?

• Household ammonia is more acidic than bleach

• Toothpaste is more basic than household ammonia

• Pure water is more acidic than black coffee

• Pure water is more basic than toothpaste

Margaret tests four solutions to determine whether they are acidic, basic, or neutral. She records her results in a lab notebook.

Which of the following statements from Margaret's lab notebook indicates she is testing an acid?

• I put on protective gloves and touched the solution. It felt slippery as if I were touching wet soap

• I added some drops of a bromothymol blue indicator solution, and the color indicated a pH of about 7.0 on the scale

• I placed a drop of oil into the solution in the beaker. After two minutes, I noticed that the solution had dissolved the oil

• I dipped a universal indicator strip into the beaker of the solution. The strip turned orange, matching a pH range of 3.0 to 4.0 on the color scale

Margaret tests four solutions to determine whether they are acidic, basic, or neutral. She records her results in a lab notebook.

Which of the following statements from Margaret's lab notebook indicates she is testing a base?

• I put on protective gloves and touched the solution. It felt slippery as if I were touching wet soap

• I added some drops of a bromothymol blue indicator solution, and the color indicated a pH of about 7.0 on the scale

• I placed a drop of oil into the solution in the beaker. After two minutes, I noticed that the solution had dissolved the oil

• I dipped a universal indicator strip into the beaker of the solution. The strip turned orange, matching a pH range of 3.0 to 4.0 on the color scale