1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
notsponge [240]
3 years ago
5

Please select the best answer and click "submit."

Chemistry
1 answer:
vladimir1956 [14]3 years ago
5 0
When it comes to physical changes like phase changes, there are two types of heat energy: sensible heat and latent heat. Sensible heat is the heat absorbed/released when you heat the substance but it doesn't change phase. An example would be heating lukewarm water. The substance is liquid all throughout. Latent heat, on the other hand, is the heat absorbed/released when there is a phase change. An example would be boiling water, because it changes liquid to vapor. 

Hence, for freezing liquid, you use the latent heat, specifically the heat of fusion. The answer should be

2.5 g * (1 mol/18.02 g) * 6.03 kJ/mol = 0.84 kJ/mol

The answer is not in the choices. You only use Hvap if you boil water.
You might be interested in
1. Some athletes have as little as 3.0% body fat. If such a person has a body mass of 65 kg, how many pounds of body fat does th
77julia77 [94]
1. 3.0% ----> 3.0 kg fat= 100 kg body weigh
also remember that 1 kg= 2.20 lbs

65 kg  \frac{3.0 kg}{100 kg} x  \frac{2.20 lb}{1 kg} = 4.29 lbs

2. 0.94 g/mL----> 0.94 grams= 1 mL
1 Liters= 1000 mL
1kg= 1000 grams

3 Liters  \frac{1000 mL}{1 L} x   \frac{0.94 grams}{1 mL} x  \frac{1 kg}{1000 g} x   \frac{2.20 lbs}{1 kg}  = 6.20 lbs
3 0
3 years ago
Read 2 more answers
Question 4 (higher question)
Jet001 [13]

Answer:

Explanation:

Describe means you should recall facts, events or processes accurately. You might need to give an account of what something looked like, or what happened.

Explain means you need to make something clear, or state the reasons for something happening.  

Compare means you need to describe similarities and differences between things. If you are asked to compare X and Y, write down something about X and something about Y, and give a comparison. Do not just write about X only or Y only.

Evaluate means you must use information supplied, or your own knowledge, to consider the evidence for and against or to identify strengths and weaknesses. You must then complete your answer with a conclusion, stating which is better and why, for example.

8 0
3 years ago
What are the four body systems that are involved of getting oxygen in our cells ?
Alex17521 [72]

Answer: The cells that make up the digestive, muscular, skeletal, reproductive, and excretory systems all need oxygen from the respiratory system to function, and the cells of the respiratory system—as well as all the other systems—need nutrients and must get rid of metabolic wastes.

Explanation:

8 0
3 years ago
Plz helpp<br>Which pH value indicates the solution with the highest concentration of hydronium ions​
navik [9.2K]

Answer:

Hydronium ion concentrations increase with decreasing pH values. So, the solutions with the lower pH values have the higher H₃O⁺ concentrations.

Explanation:

4 0
2 years ago
Fill in the blanks: ______ compounds break up into ______ and ______ in solution, which can move freely and carry an _______ cur
zmey [24]

I hate virtual school

7 0
3 years ago
Other questions:
  • The process in which a large atom is split into two smaller atoms and releases energy is called
    13·1 answer
  • How molecules of N2 gas can be present in a 2.5 L flask at 50°C and 650 mmHg?
    7·1 answer
  • Which is the formula for diarsenic pentoxide?
    9·2 answers
  • In the simple act of lighting a match, chemical energy stored in the match head is transformed into heat and light. What is true
    9·2 answers
  • element x is a neutral element and has 39 protons. what element is it and how many electrons does it have? (use the periodic tab
    5·1 answer
  • if 200.0 of copper (II) sulfate react with an excess of zinc metal, what is the theoretical yield of copper?
    12·1 answer
  • Arrange the elements in order of increasing electronegativity. Use the periodic table to help you arrange the elements.
    11·2 answers
  • Which of the following describes the Bohr atomic model?
    6·2 answers
  • 2)What is the downside to having concrete as the second most consumed<br> resource in the world?
    11·1 answer
  • The following information is to be used for the next 2 questions. In order to analyze for Mg and Ca, a 24-hour urine sample was
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!