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4 years ago

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

1 answer:

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