7 Science Unit 1 Quizizz Review

7 Science Unit 1 Quizizz Review

Valor 7th Grade Science

Do First

• Enter the room SILENTLY

• Take out your materials

  • Chromebooks

  • Pencil

  • Sprint Tracker

• Begin your Do Now

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Most missed on the Exit Ticket. Where did we go wrong?

Multiple Choice

Which diagram(s) best represent diatomic elements?

• I only

• II only

• I and II only

• II and IV only

Multiple Select

Which particle diagrams represent mixtures of diatomic elements? Select two answers.

• A

• B

• C

• D

How do we know?

Multiple Choice

Which statement correctly describes the components of sodium carbonate (Na₂CO₃)?

• Sodium carbonate is a compound that contains 6 different elements.

• Sodium carbonate is an element that contains 3 different compounds.

• Sodium carbonate is a compound that contains 3 different elements.

• Sodium carbonate is an element that contains 6 different compounds.

Multiple Select

A pure substance is _________.  Choose two answers

• composed of two or more elements with different compositions.

• composed of only one type of atom, molecule or compound

• composed of multiple separate compounds

• can only be broken down by chemical means

Multiple Choice

A water molecule is made up of one oxygen atom and two hydrogen atoms. Why is water considered a pure substance?

• Water molecules are made up of different types of atoms.

• Water cannot be broken down by physical means.

• Water can be combined with other substances by physical means.

• Water can be broken down by physical means.

So how do we compare and contrast Pure Substances and Mixtures?

Multiple Select

The intermolecular forces between particles that are responsible for particle arrangements in the various states of matter are _____. Select two answer choices.

• stronger in solids than in liquids

• stronger in gases than in solids

• equally strong in gases and in liquids

• stronger in liquids than in gases

How do we know?

• Kinetic molecular theory

• Temp vs Pressure​

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Now let's practice some more​

Multiple Choice

A balloon is inflated with room temperature air and then put in a sunny place. The balloon expands slightly due to a rise in temperature. Which of the following best describes the molecules of air inside the balloon when the balloon is left in the sunlight compared to when it was first inflated?

• The molecules are moving faster.

• There are more molecules in the balloon.

• There are fewer interactions between the molecules of air in the balloon.

• The molecules of air stop colliding with the walls of the balloon.

Multiple Choice

Which of the following is an example of a container that is filled with a pure substance rather than with a mixture?

• A glass filled with chocolate milk

• A balloon filled with helium

• A jar filled with salt water

• A tire filled with air

Multiple Choice

Which of the following answer choices is NOT an example of a compound ?

• Aluminum oxide (Al2O3)

• Oxygen Gas (O2)

• Sulfate (SO2) 

• Silicon dioxide (SiO2)

Multiple Choice

Which of the following statements correctly identify elements and compounds? 

• H₂ is a compound while H₂O is an element.

• NaCl is an element while O₂ is a compound.

• C is a compound while MgCl₂ is an element

• Cl₂ is an element while H₂O is a compound.

One Last Review

Multiple Choice

A potato slice is placed in a bowl of water. It is allowed to soak for several hours and then removed from the water. The potato slice feels firmer and slightly heavier than it did before being soaked in the water.

Which explanation is consistent with this demonstration?

• Water moved out of the potato cells by osmosis because the water in the bowl has more solids dissolved in it than the potato cells do.

• Water from the bowl pulled the water inside the potato slice toward the surface of the slice and made it feel firmer.

• Water from the bowl was absorbed into tiny holes and cracks in the surface of the potato which acted like a sponge.

• Water entered the potato cells by osmosis because the cells of the potato have more dissolved solids in them than the water in the bowl does.