Emulsifiers and Mixtures QUIZ

An _______________ is an ingredient that allows normally unmixable liquids to stay mixed.

• emulsifier
• glue
• substance
• molecule

A stable mixture is one that does not separate.

• True

• False

Molecules in an emulsifier ____________ and hold together molecules of liquids that don’t normally mix.

• connect
• repel
• separate
• attract

Students plan to combine two different substances. They want to see if a new substance is created. Which observation of the resulting substance will provide evidence of a new substance?

• It will have more weight than the original substances.

• It will have different properties than the original substances.

• It will have the same volume as one of the original substances.

• It will have the same properties as one of the original substances.

Tags

NGSS.MS-PS1-2

Which statement best explains why Beth can no longer see the sugar in the water? Describing Matter With a Model: Beth sets up an experiment using sugar and a cup of liquid water as shown. She adds a spoonful of sugar crystals to the water and then stirs the mixture. After a few minutes, Beth cannot see the sugar crystals in the water.

• the sugar disappeared

• the sugar evaporated

• the sugar particles are too small to be seen

• the sugar molecules were attracted to the water molecules

Based on information in the chart, which observation can be used to identify which powder is salt and which powder is sand? The teacher tells Martina to identify the material for each ball and each powder using information in the chart.

• attracted to a magnet

• color

• conducts electricity

• dissolves in water

Tags

NGSS.MS-PS1-2

What is the purpose of recording the properties of the substances both before and after they are combined?

• to determine if substances can have color

• to determine which mixture is the heaviest

• to determine which mixture formed the fastest

• to determine if new substances have been made

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Oil and water separate again after being mixed.

• True

• False

Tags

NGSS.MS-PS1-2

When lecithin is added to a salad dressing made of oil and vinegar, the solution will _________________.

• eventually separate

• remain mixed

• have sediment

• mix, then separate

The reason water and oil do not mix is because the water molecules are more attracted to other water molecules than to oil molecules.

• True

• False