Chemistry

Which of the following indicate that a chemical reaction has occurred?

• The formation of gas bubbles

• An odor

• a change in color

• all of these indicate a chemical reaction

Tags

NGSS.MS-PS1-2

Helium balloons rise on earth because

• helium is less dense than air
• helium is more dense than air
• helium is cooler than air
• helium is warmer than air

The pH scale is a range from:

• 1-7
• 0-14
• 1-5
• 1-20

A(n) ______ is a substance with a pH less than 7

• Acid
• Alkaline
• Base
• Buffer

What is the only substance with a neutral pH of 7?

• Milk
• Orange Juice
• Water
• Blood

The substance being dissolved in a solution.

• sands
• solute
• solvent
• alloy

Tags

NGSS.5-PS1-4

The substance in which a solute is dissolved

• sands
• solvent
• alloy
• negative particles

The substance in which a solute is dissolved

• sands
• solvent
• alloy
• negative particles

Solutions are composed of __________ .

• salts and solutes
• solvents and salts
• solutes and alloys
• solutes and solvents

If we are making Kool-aid with sugar, Kool-aid powder, and water, which part is the solvent?

• water
• powder
• sugar
• powder and sugar