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andriy [413]
4 years ago
12

When a substance cools down, is it releasing or absorbing energy?

Chemistry
1 answer:
Wewaii [24]4 years ago
4 0
<span>When something becomes cold or freezes such as water,it is releasing energy.The temperature continues to decrease more energy is given up and released.It stays a constant temperature as more energy is released to maintain the temperature needed to achieve the correct degree needed.</span>
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Silver has a density of 10.5 grams/cm3. What would be the mass of a 5 cm3 piece of sliver
enyata [817]

Answer:

52.5 g

Explanation:

Density= mass/volume

Rearranging the equation gives us m= d(V)

m= d(V)

m= (10.5 grams/cm^3)(5 cm^3)

m= 52.5 g

8 0
3 years ago
A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the sameconcentration of s
elixir [45]

Answer: Molarity of a physiological saline solution is 0.15 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

n = moles of solute

V_s =volume of solution in ml

Given : 0.89 g of sodium chloride in 100 ml of solution.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{0.89g}{58.5g/mol}=0.015moles

Volume of solution = 100 ml

Molarity=\frac{0.015\times 1000}{100ml}=0.15M

Molarity of physiological saline solution is 0.15 M

4 0
4 years ago
To change a liquid to a gas energy must be what​
laiz [17]

Answer:

Evaporation

Explanation:

Evaporation is the process of a liquid turning into its gaseous form. When a liquid hits its boiling point, it will evaporate and turn into gas. It can release vapor as well.

4 0
3 years ago
Can someone please tell me this answer​
ra1l [238]

Answer:

Carbon + oxygen

C + O2 - CO2

Sulphur + Oxygen

S + O2 - SO2

5 0
3 years ago
Predict what would happen to the volume of the gas if the pressure in Step 3 was increased to 800 kPa.
Inga [223]
The volume you would expect the gas to occupy if the pressure is increased to 40
The kpa would be 50 liters
8 0
4 years ago
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