Unit 2 Test-Mixtures

Look at the image. Why is this considered a mixture?

• It contains all solid items and no liquuids.

• It cannot be separated into individual items

• It has different nuts and fruits

• The different parts can be easily separated

Tags

NGSS.5-PS1-3

NGSS.5-PS1-4

Which of these items could be classified as solutions? Choose all that apply.

• A bucket of saltwater

• A bowl of vegetable soup

• A ladle of oil and vinegar salad dressing

• A cup of tea

How are a mixture of SAND and WATER different from a mixture of SALT and WATER?

• Sand melts in the water. Salt dissolves in the water.

• Sand floats in the water. Salt sink in the water.

• Sand dissolves in the water. Salt does not dissolve in the water.

• Salt dissolves in the water. Sand does not dissolve in the water.

Tags

NGSS.MS-PS1-2

Which of the following describes how a solution is formed?

• A substance melts in another substance, forming a solution.

• A solid substance floats on top of a liquid substance, forming a solution.

• A substance breaks down to dissolve into tiny pieces in another substance, forming a solution.

• A solid substance melts into a liquid substance, forming a solution.

The diagram compares mixtures and solutions. Where on the diagram should "Contains 2 or more substances" be placed?

A student adds 25g of sand to a beaker filled with 100mL of water and lets it sit for 10 minutes. Which TWO facts about the mixture are true?

• The new mixture contains 25g of sand.

• The new mixture contains 125mL of water.

• The new mixture contains something that has dissolved.

• The new mixture has sand in the bottom of the glass.

• The new mixture will be totally clear.

Tags

NGSS.MS-PS1-2

A student follows these procedures in class. How many grams of sugar can they expect to find in the pan after step 3?

• 0 grams

• 100 grams

• 900 grams

• 1,000 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Choose the tools that would be helpful to separate a mixture of sand, salt, and water.

• strainer and magnet

• filter and hot plate

• tweezers and strainer

• magnet and hot plate

Use the venn diagram to help you complete the sentences.

Solutions can be separated by​ (a)   while mixtures can be separated by ​ (b)   . An example of a solution is ​ (c)   and an example of a mixture would be ​ (d)   .

• evaporation
• sifting
• ocean water
• fruit salad

What are the differences between a solution and a mixture of solid objects? Choose TWO correct answers.

• The parts of a solution are evenly mixed and cannot be easily separated.

• The parts of a mixture are evenly mixed and cannot be easily separated.

• Solutions can always be separated using a filter.

• Mixtures can easily be separated into their parts.