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WorksheetsU1 Chapter 1 - 8 STUDY GUIDE
Total questions: 11
Worksheet time: 6mins
1. A ______ is an element if all the atoms in the substance are the same.
mixture
chemical
substance
proton
Based on the chart which element makes up about 27 percent of Earth's crust?
calcium (Ca)
iron (Fe)
oxygen (O)
silicon (Si)
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
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.
The only sure evidence for a chemical reaction is ___.
the formation of a gas
a color change
the production of one or more new substances
changes in properties
