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motikmotik
3 years ago
10

Which process is a chemical change?

Chemistry
1 answer:
dexar [7]3 years ago
6 0

Answer:

4

Explanation:

1, 2, and 3 are changes in the state of matter. 4 is a chemical reaction because the resulting products are different substances from the first one.

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3 0
3 years ago
What is the specific latent heat of fusion for a substance that takes 550 KJ to melt 14 KG at 262 K?
Arte-miy333 [17]

Answer:- The right choice is A. 3.9*10^4\frac{J}{kg} .

Solution:- Latent heat of fusion means the heat required to melt the solid at constant temperature means there is no change in temperature only the solid changes to liquid. So, it is a solid to liquid phase change.

q=m*\Delta H_f_u_s

where q is the heat required to convert solid to liquid, m is the mass and \Delta H_f_u_s is the latent heat of fusion.

From given info, 550 kJ that is 550000 J of heat is required to melt 14 kg of solid at 262K temperature. Let's rearrange the equation for latent heat of fusion and plug in the values in it.

\Delta H_f_u_s=\frac{q}{m}

\Delta H_f_u_s=\frac{550000J}{14kg}

\Delta H_f_u_s = 39286\frac{J}{kg}

If we round this value to two sig figs and write in scientific notations then it becomes 3.9*10^4\frac{J}{kg} .

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5 0
3 years ago
Calculate the number of moles in 200 grams of Sodium hydroxide​
TEA [102]

Answer:

The answer is 5 mol

Explanation:

Number Of Moles = Mass Of Substance ÷ Mass Of One Mole

Mass of NaOH = Molar Mass of Sodium + Oxygen + Hydrogen

23 + 16 + 1

40 g/mol

Number of Mole = 200/40 = 5 mol

Thus, The number of Moles in 200 grams of Sodium hydroxide is 5 mol

<u>-TheUnknownScientist 72</u>

6 0
3 years ago
Atoms: SC.8.P.8.7
WARRIOR [948]

Answer:

1 = D

2 = C

3 = A

4 = F

5 = G

6 = B

7 = E

4 0
3 years ago
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