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3 years ago

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Chemistry

1 answer:

const2013 [10]3 years ago

6 0

Answer:

Explanation:

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Dry ice will go directly from a solid to a gas at room temperature. Going directly from a solid to a gas is called_____________

Elena L [17]

Answer:

When a solid changes into a gas, it is called sublimation.

Explanation:

3 0

3 years ago

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You make some iced tea by dropping 325 grams of ice into 500.0 mL of warm tea in an insulated pitcher. If the tea is initially a

lora16 [44]

Explanation:

The given data is as follows.

Mass of ice dropped = 325 g

Initial temperature = $30^{o}C$ = (30 + 273) K = 303 K

Final temperature = $0.0^{o}C$ = (0 + 273) K = 273 K

Now, using density of water calculate the mass of ice as follows.

$m_{ice} = \frac{500 ml \times 1.0 g/mol}{1 ml}$

= 500 g

As the relation between heat energy, specific heat and change in temperature is as follows.

Q = $m \times C_{p} \times dT$

= $\frac{500 g}{18 g/mol} \times 75.3 J/K/mol \times (303 - 273)K$

= 62750 J

Also, relation between heat energy and latent heat of fusion is as follows.

Q = m L

= $\frac{325 g}{18 g/mol} \times 6 \times 10^{3}$

= 108300 J

Therefore, we require $\frac{325 g}{18 g/mol} J$ heat but we have 40774.95 J.

So, $mass_{ice} = \frac{m \times C_{p} \times (T_{f} - T_{i})}{\Delta H_{f}}$

= $\frac{62750 J}{333}$

= 188.4 g

Hence, the mass of ice = 325 g - 188.4 g

= 137 g

Therefore, we can conclude that 137 g of ice will still be present when the contents of the pitcher reach a final temperature.

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3 years ago

How many electrons can the n = 4 shell hold?

uysha [10]

Answer: I think its 32 I'm not sure

Explanation:

6 0

3 years ago

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1. How much heat (in calories) is needed to raise 20 g of H2O from 5°C to 40°C? (c = 1.0 cal/g °C)

KIM [24]

Answer:

700 calories

Explanation:

Using the formula below:

Q = m × c × ∆T

Where;

Q = amount of heat required (calories)

m = mass of substance (g)

c = specific heat of substance (cal/g°C)

∆T = change in temperature (°C)

According to this question, the following information was provided;

Q = ?

m = 20g

c = 1.0 cal/g °C

∆T = 40°C - 5°C = 35°C

Using the formula; Q = m × c × ∆T

Q = 20 × 1 × 35

Q = 700 calories

Hence, 700 cal of heat energy is needed to raise 20 g of H2O from 5°C to 40°C.

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2 years ago

How many significant figures does 104,000 have

JulijaS [17]

Answer:

104,000 has 3 significant figure.

Explanation:

This is because all non-zero digits are significant and zeros in between non-zero digits are significant.

7 0

3 years ago