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1) na2s (aq) + cd(no3)2(aq)→cds (s) +  2nano3(aq)  is which type of reaction?

2) which phrase is the best description of a redox reaction?

a) a reaction in which the exchange of electrons (or oxygen) occurs

b) a reaction in which a precipitate forms as a product

c) a reaction in which two new products are created

d) a reaction that results in the release of heat or light

3) why does the reaction h2o + ag→no reaction not proceed to a product?

a) silver has a lower activity than hydrogen and cannot replace it.

b) silver has a higher activity than hydrogen and cannot replace it.

c) the reaction proceeds too slowly to create products.

d) the reaction cannot occur because water is a reactant.

4) what is the balanced form of the equation c2h6 + o2→co2+h2o ?

a) c2h6 + 3o2→2co2+2h2o

b) c2h6 + 3o2→2co2+3h2o

c) 2c2h6 + 7o2→4co2+6h2o 

d) c2h6 + 5o2→3co2+5h2o

5) the equation 2nano3 + cacl2→2nacl+ca(no3)2 is balanced.

how many atoms of sodium (na) are there on either side of the equation?

two

four

one

six

6) agno3(aq)+cu(s)→ag(s)+cu(no3)2(aq) is an example of which type of reaction?

a) double-displacement

b) decomposition

c) redox

d) combustion

7)which example best describes a double displacement reaction?

a)two compounds combine to form one new compound.

b) the ions of two ionic compounds switch places and a gas is formed.

c) one compound breaks down into two different compounds.

d) a compound reacts with oxygen to release a lot of heat.