7th:br- Identifying Unknown Solids Quiz

What is the main reason for not using the same pipette for different substances?

• To make the experiment easier

• To save time

• To use less material

• To avoid cross-contamination

Which of the following is a physical property you might observe in a solid?

• Color change

• Bubbling

• Grain size

• Smell

What happens when calcium carbonate is mixed with vinegar?

• It dissolves completely

• It bubbles up

• It remains unchanged

• It changes color

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a notable property of ammonia that should be recorded?

• Its color

• Its thickness

• Its ability to dissolve

• Its strong smell

What is the purpose of using red cabbage extract in the experiment?

• To add flavor

• To act as a color indicator

• To clean the equipment

• To dissolve the solids

What happens when red cabbage extract is added to mineral oil mixtures?

• It evaporates

• It changes to a bright color

• It forms bubbles

• It dissolves completely

Tags

NGSS.MS-PS1-2

What should you do after adding the unknown solid to the wells?

• Throw it away

• Mix it with all known liquids at once

• Record its physical properties

• Ignore it

Tags

NGSS.MS-PS1-2

Why is it important to compare the unknown solid's reactions with known results?

• To make the experiment longer

• To practice writing

• To identify the unknown solid

• To use up all the materials

Tags

NGSS.MS-PS1-2

Which property did he state to identify, first?

• chemical property

• physical property

Which chemical did he say had a strong smell?

• ammonia

• mineral oil

• calcium carbonate

• sodium bicarbonate