Question

Which of the following is an acid based reaction?

Pb(NO3)2+2KI->2KNO3+PbI2

2Mg+O2->2MgO

C2H8+5O2->3CO2+4H2O

H2SO4+2KOH->K2SO4+2H2O

Place the correct coefficients to balance the reaction below:
____CH₄ + ____O₂→ ____CO₂ + ____H₂O_____

H₂CO₃ --> H₂O + CO₂ is a

Decomposition reaction
Single replacement reaction
Combustion Reaction
Synthesis Reaction
Double replacement reaction

Balance the following reaction
___Al + ___O₂→ ___Al₂O<sub>3

2,1,1
4,3,2
2,3,1
5,3,2</sub>

Mg + 2HCI->MgCI+H2

How many grams of H2 will be produced from 12 grams of Mg

3.0

2.0

1.0

4.0

Balance the reaction below:

___NH₃ → ___N₂ + ___H₂

2,3,5
2,1,3
1,4,2
1,1,3

Balance the following reaction: What are the correct coefficients?

___P + ____ O₂ → ___P₄O₁₀

4,10,1
1,2,4
4,5,1
1,5,4

The equation shows a summary of the chemical reactions of photosynthesis.

6CO2+6H2O+energy->C6H12O6+____
what is missing from the product side of the equation?
12 carbon atoms
6 carbon atoms
12 hydrogen atoms
2 water molecules

For the reaction CaO(s) + H2O(l) → Ca(OH)2(s), ΔH = −65.2 kJ. This value means that 62.5 kJ of heat is __________ during the process.

destroyed

changed to mass

released

absorbed

The following reaction is:

Ca + 2 HCl --> CaCl₂ + H₂

Decomposition reaction
Single replacement reaction
Combustion Reaction
Synthesis Reaction
Double replacement reaction

The following reaction can be identified as

P₄ + 5 O₂ --> 2 P₂O₅

Decomposition reaction
Single replacement reaction
Combustion Reaction
Synthesis Reaction
Double replacement reaction

The unbalanced equation below shows the combustion of methane.
___CH4+___O2->___CO2+___H2O
Which series of numbers represents the coefficients necessary to balance equations?

1,1,1,2
0,3,2,2
1,2,1,2
2,2,1,4

The reaction between propane (C₃H₈₎ and oxygen below is classified as:

C₃H₈ + 5 O₂ --> 3 CO₂ + 4 H₂O

Decomposition reaction
Single replacement reaction
Combustion Reaction
Synthesis Reaction
Double replacement reaction

The the following reaction is:

BaCO₃ --> BaO + CO₂

Decomposition reaction
Single replacement reaction
Combustion Reaction
Synthesis Reaction
Double replacement reaction

When magnesium is burned in the presence of oxygen, it produces magnesium oxide according to the following chemical equation.

2Mg+O2->2MgO
If 3.45 grams of Mg are burned, how many grams of MgO are produced?

5.72
8.69
3.45
4.35

When a molecule is separated into its component parts, it forms

compounds
atoms
protons
ions

Answer 1

1)
H2SO4 is acid and KOH is base
So, acid base reaction is:
H2SO4+2KOH->K2SO4+2H2O

2)
CH4 + O2 —> CO2 + H2O
Balance H:
CH4 + O2 —> CO2 + 2H2O
Balance O:
CH4 + 2O2 —> CO2 + 2H2O
So, coefficients are:
1,2,1,2

3)
Here H2CO3 is decomposing to form 2 products
So, this is Decomposition reaction

4)
Al + O2 —> Al2O3
Balance Al:
2Al + O2 —> Al2O3
Balance O:
2Al + 3/2 O2 —> Al2O3
multiply all by 2:
4Al + 3 O2 —> 2Al2O3
Answer: 4,3,2

only 4 parts at a time