At normal atmospheric pressure, water freezes at:a. -20 °C
b. 0 °C
c. 100 °C
d. 120 °C

Answers

Answer 1

Answer: Water will freeze at 0°C so the answer is b

Answer 2

Answer: Hi there! Your answer would be B. 0°C. Just like water at a lake, that water is a liquid and when it freezess it eventually becomes a solid. Now, you could ice skate on the lake, but make sure that the water is absolutely frozen.

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A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?

Answers

The specific of the unknown substance that underwent a change in temperature is 0.567 J/g-C. This was solved using the equation for heat transfer which is:

U = mCp(Tf-Ti)

where:
U = heat absorbed or released in joules
m = mass in grams
Cp = specific heat in J/g-C
Tf = final temperature
Ti = initial temperature

Substituting values and converting 0.158 kg to grams gives the value 0.567 J/g-C. You can use a table of specific heat values to determine what the substance is as well.

Answer: 0.469 J / g°C

Explanation:

1) Data:

m = 0.158 kg

Q = 2,150.0 J

ΔT = 61.0°C - 32.0°C

Cs = ?

2) Formula:

Q = m×Cs×ΔT

3) Solution

i) Solve for Cs: Cs = Q / [m×ΔT]

ii) Plug in the data and compute

Cs = 2,150.0 J / [158 g × (61.0°C - 32.0°C) ] = 0.469 J / g°C

How many moles of O2 would be consumed if 13.673 g of V were consumed according to the reaction below?

Answers

To determine how many moles of O2 would be consumed if 13.673 grams of V (vanadium) were consumed in a chemical reaction, you'll first need to know the balanced chemical equation for the reaction. I'll assume the reaction is as follows:

V + O2 → VO2

From the balanced equation, you can see that 1 mole of V reacts with 1 mole of O2 to form 1 mole of VO2. This means that the mole ratio of V to O2 is 1:1.

Now, calculate the number of moles of V in 13.673 grams:

Moles of V = Mass (grams) / Molar mass (g/mol)

The molar mass of V is the atomic mass of vanadium, which is approximately 50.94 g/mol.

Moles of V = 13.673 g / 50.94 g/mol ≈ 0.2684 moles

Since the mole ratio of V to O2 is 1:1, the number of moles of O2 consumed will also be approximately 0.2684 moles.

So, 0.2684 moles of O2 would be consumed if 13.673 grams of V were consumed in the reaction.

Why might calcium be important in the diet of many living
things?

Answers

Answer:

Calcium is a nutrient that all living organisms need, including humans. It is the most abundant mineral in the body, and it is vital for bone health. Humans need calcium to build and maintain strong bones, and 99% of the body’s calcium is in the bones and teeth.

Answer: Helps form bones and shells

Explanation:

How many moles of silver chloride are produced from 15.0 mol of silver nitrate?

Answers

Answer:

15 moles

Explanation:

What are three types of fossil fuels?

Answers

The three types of fossil fuels are coal, oil and natural gas.

With regard to the pH scale, a solution with a pH A. close to 14 is considered a strong base.
B. lower than 7 is considered basic.
C. higher than 7 is considered an acid.
D. of 6 is considered neutral.