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tino4ka555 [31]
3 years ago
8

Al wonders if adding salt to water will affect how long it takes the water to

Chemistry
1 answer:
love history [14]3 years ago
6 0

The hypothesis is that salt water freezes faster than fresh water.

The dependent variable is time taken for ice to appear.

The independent variable is presence or absence of salt

The constants are the amount of water in each tray, freezing conditions and length of time of exposure to freezing condition.

The control group is the tray to which salt was not added

The experimental group is the tray to which salt was added

The presence of solutes in a solution causes the freezing point depression.

A solution is made up of a solute and a solvent. In the presence of a solute, the freezing point of a pure solvent is decreased. This is because freezing point is a colligative property.

Colligative properties depend on the amount of solute present.

Hence, the pure water freezes faster (ice begin to appear earlier) than the salt water.

The hypothesis put forward in this experiment was found to be invalid by the experiment.

For more about colligative properties, see

brainly.com/question/10323760

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In a solution of salt and water which compound is the solute?
ra1l [238]
Solute is what gets dissovled, in this case the salt, and the solVENT is whatever a material is dissolved into, in this case the water.
7 0
3 years ago
How much heat is given off when 18.5g of water at 35.0 degrees Celsius freezes to ice at -5.00 degrees Celsius
saveliy_v [14]

9086.3J

Explanation:

Given parameters:

Mass of water = 18.5g

Initial temperature of water = 35°C

Finial temperature = -5°C

Unknown:

Amount of heat given off = ?

Solution:

In converting the water to ice, the water goes through these  processes:

   35°C  to freezing point at 0°C   =  mcΔT

   0°C  of water to 0°C of ice = mL

   0°C of ice to -5°C  = mcΔT

The heat given off;

 H = mc₁ΔT  +  mL  +  mc₂ΔT

m is the mass of water

c₁ is the specific heat capacity of water = 4.2J/g °C

c₂ is the specific heat capacity of ice = 2.03J/g °C

L is the latent heat of fusion = 334J/g

ΔT = T₂ - T₁ = temperature change

H = 18.5 x 4.2 + (0-(-35)) + (18.5 x 334) + (18.5 x 2.03 x (-5 - (0))

H = 2719.5J  + ‬6179J + 187.8J = 9086.3J

learn more:

Specific heat brainly.com/question/7210400

#learnwithBrainly

5 0
3 years ago
Explain the Earth's motion through space, including precession, nutation, the barycenter, and its path about the galaxy.
Vesna [10]

The Earth spins on its axis and revolves around the Sun. The tilt of its axis with respect to the Sun causes the Earth's seasons. The Earth also follows the Sun's rotation around the center of the Milky Way galaxy, which is moving through space.

3 0
3 years ago
Read 2 more answers
What is the heat capacity of 170 g of liquid water?
sesenic [268]
The specific heat capacity of water (which is defined as the amount of heat required to raise the temperature of one gram of water by 1 degree kelvin) is given as <span>4.1813J/gK (at 25°C).

Therefore, to get the heat capacity of a certain mass (in grams), we just have to multiply this mass by the specific heat capacity of water as follows:
heat capacity of 170 g = 170 * </span><span>4.1813 = 710.821 J/K</span>
4 0
3 years ago
Can someone help balance this equation?<br> NaOH(aq) + H2SO4(l) → H2O(l) + Na2SO4(aq)
xeze [42]

Answer:

2NaOH(aq) + H2SO4(l) → 2H2O(l) + Na2SO4(aq)

Explanation:

2NaOH(aq) + H2SO4(l) → 2H2O(l) + Na2SO4(aq)

6 0
3 years ago
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