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chemical reactions -level H

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1.
1 point
__C2H6 + __O2 >__CO2 + __H2O
Which set of numbers balances the chemical equation shown above?
2.
1 point
How many oxygen atoms are in one molecule of Fe2(SO4)3
3.
1 point
The protons can change and still be the same element.
4.
1 point
How many Cl atoms are in Fe(Cl)3?
5.
1 point
If two liquids mixed together produces bubbles then a ________ is produced?
6.
1 point
Is cutting a log considered a chemical change?
7.
1 point
Which of the following is an example of a chemical change?
8.
1 point
What are formed by a chemical reaction?
9.
1 point
Which of the following elements is a liquid at room temperature?
10.
1 point
What means to be pounded out into thin sheets?
11.
1 point
Two liquids mixed together can produce a solid called-
12.
1 point
Alkali metals have how many valance electrons
13.
1 point
When a chemical reaction produces heat it is called an ________ reaction?
14.
1 point
Which are the most stable group or family?
15.
1 point
What is another name for semimetals?
16.
1 point
Change of state is a chemical change.
17.
1 point
Noble gases are highly reactive?
18.
1 point
The atomic number tells me how many ______ are in the atom.
19.
1 point
What dissolves in a solvent?
20.
1 point
Each molecule of ozone contains three atoms of oxygen. Which of the following is the chemical formula for ozone?
21.
1 point
Ionic means-
22.
1 point
Which can be a physical and chemical property?
23.
1 point
What happens in an endothermic reaction?
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