3c Review
Quiz by Rebekah Beard
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- Q1
Fill in the blanks with coefficient: PCl5+__ H2O→__ HCl+H3PO4
4 and 5
6 and 8
2 and 2
2 and 4
120s - Q2
Balance this equation. __Mg + __Cl2 --> __MgCl2
1, 2, 1
1, 2, 2
already balanced
2, 1, 1
120s - Q3
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
4
1
6
2
120s - Q4
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
the mass is the same
the product is half the mass of the reactants
the product is doubled
the mass changes depending on the reaction
120s - Q5
What does the Law of Conservation of Mass state?
Matter cannot be gained or lost in a chemical reaction.
Matter can only be lost in a chemical reaction.
Matter can only be gained in a chemical reaction.
Matter can be gained and lost in a chemical reaction.
120s - Q6
Name the part that is bolded: H2 + O2 -> H2O
subscripts
reactants
products
coefficients
120s - Q7
What is the arrow in a chemical equation...
H2 + O2 --> H2O
yields
chemical equation
reactants
products
120s - Q8
Which problem is balanced?
2Na + 2H2O --> 2NaOH + H2
SO2 + H20 --> H2SO4
PbO2 + 2H2
120s - Q9
Number of H in 3(NH₄)₂CrO₄
24
3
8
6
120s - Q10
How many Elements are in the compound C2H8O ?
0
3
1
2
120s - Q11
Balance this equation __Al +__HCl --> __H2 +__AlCl3
already balanced
2, 1, 4, 5
2, 6, 3, 2
4, 12, 3, 4
120s - Q12
In an endothermic reaction, heat is ...
given out or released
absorbed
60s - Q13
Exothermic reactions...
release color
release energy
absorb energy
absorb color
120s - Q14
What happens in ALL chemical changes?
energy releases and new bonds form
bonds break apart, atoms rearrange, new bonds with new chemical properties only
old bonds break, atoms rearrange, new bonds form with new physical properties only
bonds break apart, atoms rearrange, new bonds form with new chemical and physical properties
120s - Q15
In reactions, products must be equal to..
products
reactants
starters
enders
120s