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marusya05 [52]
3 years ago
5

Hydrochloric is added to a beaker containing a piece of zinc. As a result, zinc chloride is formed and hydrogen gas is released.

This is an example of
A
evaporation

B
photosynthesis

C
a physical change

D
a chemical reaction
Chemistry
1 answer:
lord [1]3 years ago
5 0

Answer:

D. A chemical reaction

Explanation:

The evolution of a gas and the formation of a new solid with different properties are signs that the original materials have changed into something else.

They have been in a <em>chemical reaction</em>.

A is <em>wrong</em>. Evaporation is a physical change in which the molecules of the liquid move into the gas phase.

B is <em>wrong</em>. Photosynthesis is the use of sunlight by a plant to convert carbon dioxide and water into glucose.

C is <em>wrong.</em> A physical change does not involve a change to another substance with new chemical properties.

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Density (D) is defined as the ratio of mass (m) to volume (V) and can be determined from the expression D = . Find the density o
olchik [2.2K]

Explanation:

87.329 g/32.32 cm³ = 2. 70 g/cm³

4 0
2 years ago
While heating up a 25 gram sample of concrete (specific heat = 0.210-cal/g°C), your initial tempărature is room temperature (25°
Lana71 [14]

Answer:

Final temperature  = 83.1 °C

Explanation:

Given data:

Mass of concrete = 25 g

Specific heat capacity = 0.210 cal/g. °C

Initial temperature = 25°C

Calories gain = 305 cal

Final temperature = ?

Solution:

Q = m. c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

305 cal = 25 g ×0.210 cal/g.°C × T2 -  25°C

305 cal = 5.25cal/°C × T2 -  25°C

305 cal / 5.25cal/°C = T2 -  25°C

58.1 °C = T2 -  25°C

T2 = 58.1 °C + 25°C

T2 = 83.1 °C

7 0
3 years ago
A student combines 20.0 grams of hydrogen and 20.0 grams of oxygen in a reaction. According to the law of conservation of mass,
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Answer:

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1 gram of both carbohydrate and protein contains 4 (kcal)

1 gram of fat contains 9 (kcal)

But peanut butter contains 5g of fat. The kilocalories of fat present is;

1 g = 9 kcal

5g = F

F = 5×9

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12g = C

C= 12×4

C = 48kcal

The kilocalories of proteins present is;

1g = 4kcal

6 g = P

P = 4× 6

P = 24 kcal

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Learn more about kilocalories here:

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