Which of the following statements is true?

Chemistry

2 answers:

Gekata [30.6K]3 years ago

8 0

Answer:

respuesta número tres

dezoksy [38]3 years ago

4 0

Answer: Option D.

Mechanical and chemical digestion occur in the mouth but only chemical digestion occur in the stomach.

Explanation:

Digestion is the breakdown of larger food particles into smaller ones that can be absorb by the body and pass out the waste product or undigested food. There are two methods digestion occurs in the body and they are; mechanical and chemical digestion.

Mechanical digestion is the physical breakdown of food into smaller pieces. It begins in the mouth when food are chewed.

Chemical digestion involves the breakdown of food into nutrients. This begin in the mouth when food is mixed with saliva and it continue in the stomach where enzymes act on the food.

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When 0.513 g of biphenyl (c12h10 undergoes combustion in a bomb calorimeter, the temperature rises from 26.3 ?c to 29.7 ?c?

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1.) The process for converting ammonia to nitric acid involves the conversion of NH3 to

Firdavs [7]

Answer:

a) 1.39 g ; b) O₂ is limiting reactant, NH₃ is excess reactant; c) 0.7 g

Explanation:

We have the masses of two reactants, so this is a limiting reactant problem.

We will need a balanced equation with masses, moles, and molar masses of the compounds involved.

1. Gather all the information in one place with molar masses above the formulas and masses below them.

MM: 17.03 32.00 30.01

4NH₃ + 5O₂ ⟶ 4NO + 6H₂O

Mass/g: 1.5 1.85

2. Calculate the moles of each reactant

$\text{moles of NH}_{3} = \text{1.5 g NH}_{3} \times \dfrac{\text{1 mol NH}_{3}}{\text{17.03 g NH}_{3}} = \text{0.0881 mol NH}_{3}\\\\\text{moles of O}_{2} = \text{1.85 g O}_{2} \times \dfrac{\text{1 mol O}_{2}}{\text{32.00 g O}_{2}} = \text{0.057 81 mol O}_{2}$