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abruzzese [7]
3 years ago
10

Most substances become less dense as the temperature increases. Which substance is an exception to this rule

Chemistry
2 answers:
stealth61 [152]3 years ago
6 0
The substance is water
oee [108]3 years ago
4 0

Answer : Ice at 0° C.

Explanation : The statement that most of the substances becomes less dense as the temperature increases is not true for ice.

As when the temperature increases the ice melts into liquid which is found to be more denser than ice. The mass is observed to be the same, but the volume decreases as the melting process occurs.

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Arturiano [62]

Answer:

1) 1.15 mol

2) M=0.45

3) 22.5 mL

4) 6.25 mL

Explanation:

1)

550 mL= 0.55 L

M= mol solute/ L solution

mol solute= M * L solution

mol solute= (2.1 M * 0.55 L )        M=1.15 mol solute

2)

155 mL = 0.155 L

80 g  -> 1 mol NH4NO3

5.61 g -> x

x= (5.61 g * 1 mol NH4NO3)/80 g       x= 0.07 mol NH4NO3

M=(0.07 mol NH4NO3)/0.155 L         M=0.45

3) M1V1=M2V2

V1= M2V2/M1

V1= (0.500 M * 0.225 L)/5.00 M             V1=0.0225 L =22.5 mL

4) M1V1=M2V2

V1= M2V2/M1

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V1=6.25 x 10^-3 L = 6.25 mL

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