Question

1. in the following chemical equation, what is the mole ratio of aluminum to copper? 2al + 3cuso₄ → al₂(so₄)₃ + 3cu (a) 2:3 b. 2:2 c. 3:6 54. if you were given 10 moles of sodium and 3 moles of chlorine gas, how many moles of table salt could be made? 2na + cl₂ → 2nacl a. 2 mol b. 6 mol (c) 10 mol 55. the products of combusting a hydrocarbon are h₂o and ____________. 56. a chemical reaction the takes heat in from its surroundings is called... a. exothermic b. endothermic 57. when the air/gasoline mixture explodes in a car engine, the energy released comes from... a. the spark plug. b. the octane and other hydrocarbon molecules breaking apart. c. the water, carbon dioxide, and other products forming. 58. the process by which plants change water, carbon dioxide, and sunlight into oxygen and glucose is called ____________. 59. a good sign that a double - replacement reaction has happened is... a. the formation of a precipitate. (b) the releasing of a gas. c. the formation of a molecular compound. d. all of the above. 60. the decomposition of a compound by running electricity through it is called... a. electronic decomposition. b. electrolysis. (a) de - electrification. d. the electric de - company.

Explanation:

Step1: Identify mole - ratio in 53

In the equation \(2Al + 3CuSO_4
ightarrow Al_2(SO_4)_3+3Cu\), the coefficient of \(Al\) is 2 and of \(Cu\) is 3, so the mole - ratio of \(Al\) to \(Cu\) is \(2:3\).

Step2: Determine limiting reactant in 54

The reaction is \(2Na + Cl_2
ightarrow 2NaCl\). The mole - ratio of \(Na\) to \(Cl_2\) is \(2:1\). Given 10 moles of \(Na\) and 3 moles of \(Cl_2\), \(Cl_2\) is the limiting reactant. From the mole - ratio of \(Cl_2\) to \(NaCl\) which is \(1:2\), the moles of \(NaCl\) formed is \(2\times3 = 6\) moles.

Step3: Recall combustion products in 55

The products of combusting a hydrocarbon are \(H_2O\) and \(CO_2\).

Step4: Define heat - absorbing reaction in 56

A chemical reaction that takes heat in from its surroundings is called endothermic.

Step5: Identify energy source in 57

When the air/gasoline mixture explodes in a car engine, the energy released comes from the octane and other hydrocarbon molecules breaking apart.

Step6: Name plant process in 58

The process by which plants change water, carbon dioxide, and sunlight into oxygen and glucose is called photosynthesis.

Step7: Recognize double - replacement reaction signs in 59

Good signs that a double - replacement reaction has happened are the formation of a precipitate, the releasing of a gas, or the formation of a molecular compound, so the answer is all of the above.

Step8: Define compound decomposition by electricity in 60

The decomposition of a compound by running electricity through it is called electrolysis.

Answer:

1. a. \(2:3\)
2. b. \(6\ mol\)
3. \(CO_2\)
4. b. endothermic
5. b. the octane and other hydrocarbon molecules breaking apart
6. photosynthesis
7. d. All of the above
8. b. electrolysis