U1 Chapter 1 - 8 STUDY GUIDE

1.     A ______ is an element if all the atoms in the substance are the same.

• mixture

• chemical

• substance

• proton

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NGSS.MS-PS1-1

Based on the chart which element makes up about 27 percent of Earth's crust?

• calcium (Ca)

• iron (Fe)

• oxygen (O)

• silicon (Si)

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NGSS.MS-PS1-1

Which of the following is a substance?

• vinegar

• milk

• cheese

• water

A substance is ___________.

• either a element or compound

• always an element

• a mixture of compounds

• always a compound

Abbie took a trip to the beach. Which is a quantitative observation she may have made?

• the waves were big

• everyone was wearing bathing suits

• it was a hot day

• there were two lifeguards on duty

Abbie took a trip to the beach. Which of the following statements are qualitative observations? CHOOSE THREE.

• Six food trucks were located on the pier

• Everyone was wearing bathing suits

• It was a very hot day

• There were four lifeguards on duty

• The waves were big

In the chemical formula Mg (s) + 2HCl (l) à MgCl₂ + H₂ (g) which element or compound is a gas.

• Hydrogen

• Chlorine

• Magnesium

• Oxygen

In the chemical formula Mg (s) + 2HCl (l) à MgCl₂ + H₂ (g) which element or compound is a solid.

• Hydrogen

• Chlorine

• Magnesium

• Oxygen

When magnesium burns, it reacts with oxygen gas to form magnesium oxide. The formula for the reaction is: 2Mg + O₂ --->  2MgO

 

Which of the following equation best describe the chemical reaction?

• oxygen + magnesium oxide

  ---> magnesium

• magnesium + oxygen ---> magnesium oxide

• magnesium oxide + oxygen

  ---> magnesium

• magnesium + magnesium oxide ---> oxygen

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Jay had two clear liquids in bottles. The mass of one liquid was 10.2 grams and the other was 7.6 grams. When he mixed them, a yellow solid formed and settled to the bottom of the bottle. He predicted that the liquid plus the solid would have more mass, so he put the bottle on a scale. The mass was 17.8 grams.

 

Why did the mass NOT change?

• A chemical reaction occurred, which means the atoms rearranged to form new substances.

• A chemical reaction occurred, which means even though the old atoms turned into new atoms, they had the same mass.

• Jay must have made an error in measuring the mass before or after he mixed the liquids.

• One of his classmates probably did something to affect his experiment.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5