Question

Fill in the blank to balance the following chemical equation:

2 Al + _____ H2SO4 --> Al2(SO4)3 + 3 H2

Match each chemical reaction to its type:


C3H8 + 5 O2 --> 3 CO2 + 4 H2O


2 H2O2 --> 2 H2O + O2


AgNO3 + KBr --> AgBr + KNO3


CuCl2 + Zn --> ZnCl2 + Cu


CaO + H2O --> Ca(OH)2

A.
combustion

B.
synthesis

C.
decomposition

D.
single replacement

E.
double replacement

You suspect one of the products of a single replacement is hydrogen gas. How might you experimentally confirm your prediction? Choose the best option.


Watch for bubbles to form in solution which indicates a gas was produced.


Waft to detect an odor from the test tube.


Place a burning splint near the end of the test tube and listen for a 'pop' sound.


Hydrogen gas is never a product in a chemical reaction.

(PLEASE HELP FAST))))

Answer 1

2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂

First equation: A. Combustion
Second equation: C. Decomposition
Third equation: E. Double Replacement
Fourth equation: D. Single Replacement
Fifth equation: B. Synthesis

We place a burning splint at the mouth of the test tube and listen for a pop sound. It occurs because Hydrogen gas is explosive. The third option is correct.