*PLEASE HELP*
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.