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White raven [17]
2 years ago
7

Several science students were about to conduct an experiment on electricity. The teacher passed on the science activity which cl

early stated the procedures for the experiment. One student did not understand the instructions. What should the student do now?
A) He could look at what the others are doing.
B) He could ask his friends to explain it to him.
C) He should ask the teacher to explain it to him.
D) He should try to figure out what to do by himself..
Chemistry
1 answer:
olganol [36]2 years ago
8 0
C. You should ALWAYS ask the teacher if you don't get something; your friends could be wrong, don't guess it, and NEVER cheat. Hope this helps!!
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How many kilocalories of heat are released when 75 g of steam at 100 degrees Celsius is converted to ice at 0 degrees Celsius?
VikaD [51]

Answer:

∴ Q = -7.52kCal

Explanation:

Using the formula for specific heat capacity:

Q = mcΔT

where ΔT = change in temperature (final - initial)  = (0 - 100)°C = -100°C

m = mass (g) = 75g

c = specific heat capacity = 4.2 J/g°C in water

⇒ Q = 75 × 4.2 × -100

= -31,500J

But 1J - 0.000239kCal

<u>∴ Q = -7.52kCal</u>

<u />

Let me know if I can be of further assistance.

5 0
3 years ago
What is the density of a substance with a mass of 1.8 kg and a volume of 0.2 L?
horrorfan [7]

Answer:

<h3>The answer is 9.0 kg/L</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}  \\

From the question

mass = 1.8 kg

volume = 0.2 L

We have

density  =  \frac{1.8}{0.2}  \\

We have the final answer as

<h3>9.0 kg/L</h3>

Hope this helps you

5 0
3 years ago
Determine if the results of the following word problem adhere to the Law of Conservation of Mass. 1. A chemist combines 4.9 g of
KiRa [710]

Answer: The results agree with the law of conservation of mass

Explanation:

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. On the reactant side, the total mass of reactants is 14.3g and the total product masses is also 14.3g. That implies that no mass was !most in the reaction. The sum of masses on the left hand side corresponds with sum of masses on the right hand side of the reaction equation.

4 0
3 years ago
Describe all the relationships between pressure, volume, and<br> temperature
hammer [34]
  • <u>The pressure of a given amount of gas is directly proportional to its absolute temperature, provided that the volume does not change (Amontons's law)</u><u>.</u>

  • <u> The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).</u>
3 0
2 years ago
Read 2 more answers
How does the law of conservation of matter apply to chemical equations?
Tasya [4]

Answer: option D.

The total number of atoms of each element on both sides of the

equation must be the same.

Explanation:

3 0
3 years ago
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