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3 years ago

Task 3 Graphical Analysis & Question (25 pts)

Chemistry

2 answers:

Keith_Richards [23]3 years ago

7 0

Answer:

Biếnnis B

Explanation:

Archy [21]3 years ago

5 0

Answer:

Biếnnis B

Explanation:

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Water has a density of 0.997 g/cm^3 at 25 degrees C; ice has a density of 0.917 g/cm^3 at -10 degrees C. (question part a) If a

Luden [163]

Mass of water added:
0.997 x 1500
= 1495.5 grams

a) Volume = mass / density
Volume = 1495.5 / 0.917
Volume = 1630 cm³ = 1.63 L

b) The ice cannot be contained in the bottle as its volume exceeds that of the bottle.

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What are three reasons that using renewable energy is important.

wariber [46]

Answer:

1. they reduce green house gases

2. they can last a long time and come back pretty much every year and some never run out

3. we have unlimited supply of most if not all renewable resources

Explanation:

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3 years ago

The reaction of hydrogen(g) with fluorine(g) to form hydrogen fluoride(g) proceeds as follows: H2(g) + F2(g) 2 HF(g) When 0.647

Nata [24]

Answer: The value of $\Delta H$ for the reaction will be -537 kJ

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of hydrogen gas = 0.647 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in above equation, we get:

$\text{Moles of hydrogen gas}=\frac{0.647g}{2g/mol}=0.324mol$

We are given:

Energy released for 0.324 moles of hydrogen reacted is 174 kJ

For the given chemical reaction:

$H_2(g)+F_2(g)\rightarrow 2HF(g)$

By Stoichiometry of the reaction:

When 0.324 moles of hydrogen gas is reacted, the energy evolved is 174 kJ

So, when 1 mole of hydrogen gas will react, the energy evolved will be = $\frac{174kJ}{0.324mol}\times 1mol=537kJ$

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

Hence, the value of $\Delta H$ for the reaction will be -537 kJ

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4 years ago

PLEASE HELP WITH THESE!! I’m stuck

ludmilkaskok [199]

3. B
4. A
5.A
6. A (i think)
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3 years ago

What causes the sugar to dissolve in water?

vaieri [72.5K]

Answer:

Sugar dissolves in water because energy is given off when the slighty polar sucrose molecules form intermoleeular bonds with the polar water molecules.

Explanation:

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