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3 years ago

Which substance can not be broken down by a chemical change?

Chemistry

2 answers:

notka56 [123]3 years ago

7 0

Answer:

Among the given substances, the one that cannot be broken down by a chemical change is arsenic.

Explanation:

Rawr

ra1l [238]3 years ago

6 0

Answer:

the substances that cannot be broken down by a chemical change is arsenic.

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A 15.0 g sample of nickel metal is heated to 100.0 degrees C and dropped into 55.0 g of water, initially at 23.0 degrees C. Assu

OLEGan [10]

Answer: The final temperature of nickel and water is $25.2^{o}C$ .

Explanation:

The given data is as follows.

Mass of water, m = 55.0 g,

Initial temp, $(t_{i}) = 23^{o}C$ ,

Final temp, $(t_{f})$ = ?,

Specific heat of water = 4.184 $J/g^{o}C$ ,

Now, we will calculate the heat energy as follows.

q = $mS \Delta t$

= $55.0 g \times 4.184 J/g^{o}C \times (t_{f} - 23^{o}C)$

Also,

mass of Ni, m = 15.0 g,

Initial temperature, $t_{i} = 100^{o}C$ ,

Final temperature, $t_{f}$ = ?

Specific heat of nickel = 0.444 $J/g^{o}C$

Hence, we will calculate the heat energy as follows.

q = $mS \Delta t$

= $15.0 g \times 0.444 J/g^{o}C \times (t_{f} - 100^{o}C)$

Therefore, heat energy lost by the alloy is equal to the heat energy gained by the water.

$q_{water}(gain) = -q_{alloy}(lost)$

$55.0 g \times 4.184 J/g^{o}C \times (t_{f} - 23^{o}C)$ = -( $15.0 g \times 0.444 J/g^{o}C \times (t_{f} - 100^{o}C)$ )

$t_{f} = \frac{25.9^{o}C}{1.029}$

= $25.2^{o}C$

Thus, we can conclude that the final temperature of nickel and water is $25.2^{o}C$ .

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3 years ago

Based on the information in the passage, what is true of gases?

luda_lava [24]

1: True
2: True
3: False
4: False

(Question 2 might not be true, not sure)

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3 years ago

Which statement explains the similarity between momentum and kinetic energy of an object?

pashok25 [27]

Momentum and Kinetic Energy...They both are directly proportional to the Mass and Velocity of the object and they are the only factors which determine them.

Hope this helps!

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3 years ago

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const2013 [10]

$\huge{ \mathrm{ \underline{ Answer }\: \: ✓ }}$

The relationship between mass of matter per unit volume is known as :

$\large \boxed{ \mathrm{density}}$

_____________________________

$\mathrm{ ☠ \: TeeNForeveR \:☠ }$

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3 years ago

Water is a good choice of solvent because it is benign, cheap and readily available. Identify two characteristics that make wate

mina [271]

Explanation:

Characteristics of good solvent choice for the recrystallization.

1. Water has low solubility of benzoic acid at room temperature.

2. Cold water's low solubility of benzoic acid allows for the high concentration production of crystal. And these crystals could be easily soluble in hot water.

3. Water dissolves soluble impurities well at the room temperature.

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3 years ago

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