Question

1. The Greek letter, Δ, is shown in the equation. What is the meaning of this letter in the equation shown below?

CH4 + O2 ->Δ CO2 + H2O

The reactants sit in a triangle to form the products.
		None of the other answers is correct.
		Isotopes of hydrogen are needed to start the reaction.
		The reaction will not take place unless the chemist uses a carbon-based catalyst.
		Heat is needed to start the reaction.

2. Abigail and Peter are asking which of the following chemicals is a product of the reaction shown below?

CH4 + 2O2 -> CO2 + 2H2O

a. CH₄

b. CO₂

c. None of the other answers is correct.

3. What type of chemical reaction is shown in the equation below?

CH4 (g) + O2 (g) ->Δ CO2 (g) + H2O (l) + heat

a. decomposition

b. single replacement

c. double replacement

d. combustion

e. synthesis / combination

3.(continued)  True or false: The chemical reaction shown in the previous question is an endothermic reaction.

4. Use the equation shown below to answer the following question. Mirela has 3.8 moles of CaCl₂ and 7.6 moles of AgNO₃. How many moles of AgCl can she make?

2 AgNO₃ +  CaCl₂ --> 2 AgCl + Ca(NO₃)₂

a. 1.9 moles
b.		2 moles
c.		5.4 moles
d.		11.4 moles
e.		7.6 moles
f.		0 moles
g.		3.8 moles
h.		1 mole

5. Use the equation shown below to answer the following question. Lisa has 15.1 grams of CaCl₂ and 46.2 grams of AgNO₃. How many grams of AgCl can she make?

2 AgNO₃ +  CaCl₂ --> 2 AgCl + Ca(NO₃)₂

a. 39 grams

b. 77.5 grams

c. 0.27 grams

d. 30.0 grams

e. 91.8 grams

Answer 1