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3 years ago

When heat energy is removed, two changes are observed:

Chemistry

2 answers:

Softa [21]3 years ago

3 0

Answer: A is condensation and B is freezing.

The process in which the gas changes to the liquid phase due to the removal of heat is known as condensation. Rains are formed in this way. The water vapour rises. As it raises above it loses heat and then cools down and condenses and comes down as rainfall.

The process in which the liquid changes to a solid on removal of heat is known as freezing. Formation of ice is an example. When the heat is removed at -4 degree Celsius the water freezes to ice.

nikitadnepr [17]3 years ago

3 0

Answer:

A is condensation and B is freezing.

Explanation:

Condensation is the process in which a gas changes into a liquid. Evaporation is the process in which a liquid changes into a gas. Freezing is when liquid changes to solid/solid liquid. Melting is when a solid/solid liquid changes to liquid.

In change A, a gas changes to a liquid; this is called condensation

In change B, a liquid changes into a solid; this is called freezing.

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The order of a reaction Z1) is the product of the powers to which the reactant concentrations are raised in the rate law. Z2) ca

irinina [24]

Explanation:

The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant.

The overall order of reaction is the sum of the individual orders of reaction with respect to the reactants.

Rate = k [A]²[B]¹

In the rate law above, the rate is second order with respect to A and first order with respect to B. The overall order of reaction is a third order reaaction given as; 2+ 1 = 3

6 0

4 years ago

N2 reacts with hydrogen gas according to the following equation:

slega [8]

Answer:

Mass = 51 g

Explanation:

Given data:

Mass of nitrogen = 41.93 g

Mass of ammonia formed = ?

Solution:

Chemical equation:

N₂ + 3H₂ → 2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 41.93 g/ 28 g/mol

Number of moles = 1.5 mol

now we will compare the moles of nitrogen and ammonia.

N₂ : NH₃

1 : 2

1.5 : 2/1×1.5 = 3 mol

Mass of ammonia formed:

Mass = number of moles × molar mass

Mass = 3 mol × 17 g/mol

Mass = 51 g

6 0

3 years ago

Of the five salts listed below, which has the highest concentration of its cation in water? assume that all salt solutions are s

Zigmanuir [339]

First of all, I need to know what these five salts are. Luckily, I found a similar problem from another website which is shown in the attached picture. The Ksp is the solubility product constant. It follows the formula:

Ksp = [cation concentration]ᵃ[anion concentration]ᵇ
where a and b are the subscripts of the metal and nonmetal, respectively.

For the solutions ahead, let x be the concentration of the cation.

A. The formula is PbCr₂O₄.
2.8×10⁻¹³ = [x][x]
Solving for x, x = 5.29×10⁻⁷ M

B. The formula is Co(OH)₂.
1.3×10⁻¹⁵ = [x][x]²
Solving for x, x = 1.09×10⁻⁵ M

C. The formula is CoS.
5×10⁻²² = [x][x]
Solving for x, x = 2.24×10⁻¹¹ M

D. The formula is Cr(OH)₃.
1.6×10⁻³⁰ = [x][x]³
Solving for x, x = 3.56×10⁻⁶ M

E. The formula is Ag₂S.
6×10⁻⁵¹ = [x]²[x]
Solving for x, x = 1.82×10⁻¹⁷ M

Thus,the highest concentration is letter B, Cobalt (II) Hydroxide.

5 0

3 years ago

PLEASE HELP ME

vichka [17]

Light moves in a straight line except at surfaces between different transparent materials, where its path bends.

4 0

3 years ago

How can you tell where there is a steep slope on a contour map?

Katena32 [7]

Answer:

Steep slopes on the contour map are identified using contour lines which are closely spaced.

Explanation:

Contour map also known as topographic maps are used to represent the three-dimensional portion of the earth’s surface in two-dimensional space. This map is used to represent the surface of the land such as steep, slopes, valleys. The contour maps are used in geological studies to understand the configuration of the earth's surface. Terms like map scale, vertical scale, contour lines are used on the contour map. Elevations are represented using contour lines. Contour lines placed very close to each represent the steep slopes and contour lines that are spaced farther away from each other represent the gentle slopes.

8 0

3 years ago