CHEMISTRY HIGH SCHOOL

Which class of elements best conducts electricity

Answers

Answer 1
Answer: Metals best conducts electicity
Answer 2
Answer: metals conduct all electricity.

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What are a few examples of what energy is?​

Answers

✅Energy exists in many different forms✅

Examples of these are: light energy, heat energy, mechanical energy, gravitational energy, electrical energy, sound energy, chemical energy, nuclear or atomic energy and so on. Each forms can be converted or changed into the other forms.

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H2O has a mc021-1.jpgHvap = 40.7 kJ/mol. What is the quantity of heat that is released when 27.9 g of H2O condenses?A)60.00 kJ
B)61.05 kJ
C)63.09 kJ
D)68.60 kJ

Answers

Energy released from changing the phase of a substance from the gas phase to liquid phase can be calculated by using the specific latent heat of vaporization. The heat of fusion of water at 0 degrees Celsius is 40.7 kJ/mol. Calculation are as follows: 


Energy = 27.9 g (1 mol / 18.02 g) x 40.7 kJ/mol


Energy = 63.09 kJ

Answer:

C- 63.09 kJ

Explanation:

I have several degrees

A chemist dissolves an unknown solute into 1000 grams of water and then measures the freezing point to be -2.88 C what can be determined from this data and from known constants for water?

Answers

ANSWER ; The moles of solute particles in the solution
the known constant of water is that it freezes at 0 degrees Celsius and boils at 100 degrees Celsius. it can be determined that because of the solute added the water becomes a compound meaning it no longer has the constants of pure water hence the difference in freezing point

If the theoretical yeild for a reaction is 156 grams and you actually made 122 grams of the product, what is your percentage yeild

Answers

The theoretical yield is the amount of product formed from the limiting reactant available. The actual yield is the amount of product formed after the reaction proceeds. The percent yield is calculated as:

Percent Yield = (actual yield / theoretical yield) x 100%
Percent Yield = (122 g / 156 g) x 100%
Percent Yield = 78.2%

Which of the following steps is important to critical thinking?

Answers

Answer:

b.

utilizing facts

Explanation:
Critical thinking helps you come up with solutions to problems.

Homogenized whole milk contains 4% butterfat by volume. how many milliliters of fat are there in a glass (250 ml) of milk?

Answers

Volume of one glass of milk = 250 mL

Percent by volume of butterfat in homogenized milk = 4%

This means 4mL butterfat is present per 100mL milk

Volume of fat present in 250 mL of homogenized milk:

250mL milk*(4mL butterfat)/(100mL milk)= 10mL butterfat

Therefore, 250mL homogenized milk which is 4 % butterfat contains 10mL butterfat.

If the density of butterfat is 0.8g/mL, the mass of butterfat present in 250mL milk will be:

10mL butterfat*(0.8g butterfat)/(1mL butterfat) =8g butterfat
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