Question 78 A refrigerator delays the spoilage of food by ________. A.killing mi

Question

Question 78

A refrigerator delays the spoilage of food by ________.

A.killing microorganisms

B.slowing down the rate of chemical reactions within microorganisms

C.expanding the water found within microorganisms

D.diminishing the supply of oxygen to microorganisms

Question 79

Which has the greatest number of molecules?

A.28 g of nitrogen, N2

B.32 g of oxygen, O2

C.32 g of methane, CH4

D.38 g of fluorine, F2

Question 80

Which of the following reaction energies is the least exothermic (but still an exothermic reaction)?

A. 540 kJ/mole

B. -540 kJ/mole

C. 125 kJ/mole

D. -125 kJ/mole

E.not enough information given

Question 81

The main component of bleach is sodium hypochlorite, NaOCl, which consists of sodium ions, Na, and hypochlorite ions, What products are formed when this compound is reacted with the hydrochloric acid, HCl, of toilet bowl cleaner?

A.The products are NaCl, O2, and HClO2.

B.The products are NaOH, H2O, and Cl2

C.The products are NaCl and HOCl.

D.The products are NaOH, O2, and Cl2

Question 82

What is the hydroxide ion concentration in an aqueous solution where the pH = 5?

A.The hydronium ion concentration equals 1 × 10-9.

B.The hydronium ion concentration equals 1 × 10-7.

C.The hydronium ion concentration equals 1 × 10-5.

D.The hydronium ion concentration equals 1 × 10-3.

Question 72

Balance these equations. ___ H2(g) + ____N2(g) ____NH3(g)

A.2, 2, 3

B.2, 2, 5

C.3, 3, 2

D.3, 1, 2

Explanation / Answer

Question 78

A refrigerator delays the spoilage of food by :D.diminishing the supply of oxygen to microorganisms

Question 79

Which has the greatest number of molecules = C.32 g of methane, CH4

Question 80

Which of the following reaction energies is the least exothermic (but still an exothermic reaction) = D. -125 kJ/mole

Question 81

The main component of bleach is sodium hypochlorite, NaOCl, which consists of sodium ions, Na, and hypochlorite ions, What products are formed when this compound is reacted with the = NaOCl + 2 HCl ---> Cl2 + H2O + NaCl

Question 82

What is the hydroxide ion concentration in an aqueous solution where the pH = 5 A) C.The hydronium ion concentration equals 1 × 10-5.

Question 72

Balance these equations. __H2(g) + ____N2(g) <---->____NH3(g)

3H2 + N2 <-----> 2NH3

3,1,2

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