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3 years ago

Hey need help. this is ONE question a 4 part one though. pls help

Chemistry

2 answers:

denpristay [2]3 years ago

4 0

A. Summer
B. Spring
C. Winter
D. Fall

shusha [124]3 years ago

3 0

I don’t get it. What is the question asking?

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Habitat loss due to the increasing human

GenaCL600 [577]

Answer:

D. decreased biodiversity

Explanation:

Habitat loss due to the increasing human

population has caused decreased biodiversity

6 0

3 years ago

PLEASE HELP

noname [10]

I really don’t understand this question soooooo yea

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3 years ago

Use the following information on Cr to determine the amounts of heat for the three heating steps required to convert 126.3 g of

Vladimir79 [104]

Answer : The amount of heat required is, 639.3 KJ

Solution :

The conversions involved in this process are :

$(1):Cr(s)(1760^oC)\rightarrow Cr(s)(1860^oC)\\\\(2):Cr(s)(1860^oC)\rightarrow Cr(l)(1860^oC)\\\\(3):Cr(l)(1860^oC)\rightarrow Cr(l)(2060^oC)$

Now we have to calculate the enthalpy change.

$\Delta H=[m\times c_{p,s}\times (T_{final}-T_{initial})]+n\times \Delta H_{fusion}+[m\times c_{p,l}\times (T_{final}-T_{initial})]$

where,

$\Delta H$ = enthalpy change or heat required = ?

m = mass of Cr = 126.3 g

$c_{p,s}$ = specific heat of solid Cr = $44.8J/g^oC$

$c_{p,l}$ = specific heat of liquid Cr = $0.94J/g^oC$

n = number of moles of Cr = $\frac{\text{Mass of Cr}}{\text{Molar mass of Cr}}=\frac{126.3g}{52g/mole}=2.428mole$

$\Delta H_{fusion}$ = enthalpy change for fusion = 20.5 KJ/mole = 20500 J/mole

Now put all the given values in the above expression, we get

$\Delta H=[126.3g\times 44.8J/g^oC\times (1860-(1760))^oC]+2.428mole\times 20500J/mole+[126.3g\times 0.94J/g^oC\times (2060-1860)^oC]$

$\Delta H=639342.4J=639.3KJ$ (1 KJ = 1000 J)

Therefore, the amount of heat required is, 639.3 KJ

4 0

3 years ago

Aqueous lithium sulfate was mixed with aqueous strontium chlorate, and a crystallized strontium sulfate product was formed. cons

Dmitriy789 [7]

Lithium sulfate is Li2SO4

Strontium chlorate is Sr(ClO3)2

Strontium sulfate is SrSO4

So the complete balanced chemical reaction for this is:

Li2SO4 (aq) + Sr(ClO3)2 (aq) --> SrSO4 (s) + 2 LiClO3 (aq)

This is a type of double replacement reaction since there is an exchange of ions.

4 0

3 years ago

A gas sample occupies a volume of 1 L at 200K. The temperature at which the gas would double its volume is

kicyunya [14]

Answer:

400 K

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this answer can help you. Have a nice day!

8 0

3 years ago