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ladessa [460]
3 years ago
11

In the chemical reaction below, calcium (Ca) and water (H2O) react to form calcium hydroxide (Ca(OH)2) and hydrogen gas (H2). Ca

() + 2H2O() → Ca(OH)2() + H2() Calcium and water are the reactants in this chemical reaction. The products are calcium hydroxide and hydrogen gas. Which statement correctly describes the total mass of the products when the reaction is complete?
A. The total mass of the products will be greater than the original mass of the reactants.
B. The total mass of the products will be less than the original mass of the reactants.
C. The total mass of the products will be equal to the original mass of the reactants.
D. The total mass of the products cannot be found from the original mass of the reactants.
Chemistry
1 answer:
lakkis [162]3 years ago
8 0

Answer:

C.

Explanation:

The mass of the reactants should not change, in fact it would be equal because the only thing that changes is the form in which your products are in. The reactants will still have the same amount of mass from the products as no products were removed or added, the structure changed, the mass did not.

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How much energy (joules) is needed to heat 250 grams of copper from 22 °C to 99 °C? The specific heat capacity (C) of copper is
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Answer:

7430.5 Joules (7.4*10^4 Joules)

Explanation:

Q=mc∆T

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Q=250*0.386*77=7430.5 Joules

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As the temperature of one of the four liquids increases, the vapor pressure will
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Answer:

a) increase exponentially.

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The vapor pressure is depend only on temperature.

The vapor pressure of liquid does not depend upon amount of liquid. For example whether the liquid is 50 g or 30 g its vapor pressure will remain same according to the temperature.

The temperature and vapor pressure have exponential relationship. As the temperature of liquid increases its vapor pressure also goes to increase. When the temperature of liquid goes to decrease its vapor pressure also decreases.

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(Please help!)
Inessa [10]

Answer:

B. temperature decreases as altitude increases.

Explanation:

Just like in the lower reaches of the atmosphere, the troposphere, in the mesosphere, temperature decreases as altitude increases.

The mesosphere is the third layer of the atmosphere just above the stratosphere.

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