2 years ago

Someone help please this is due today!!?

Chemistry

1 answer:

maria [59]2 years ago

3 0

Answer:

I think beaker three will take longer to boil since there is more water present,compared to the other beakers

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Suppose you are trying to find the volume of a box based on the following measurements for the length, width, and height of the

Dahasolnce [82]

Answer:

87.78 in cubed

Explanation:

excuse me if I am wrong i tried my best

don't know if its right

5 0

3 years ago

What law determines that chemical equations must be balanced? What does this law say?

NNADVOKAT [17]

This is seen in the first law of Thermodynamics stating that matter and energy cannot be destroyed nor created.

7 0

3 years ago

When 15.3 g of sodium nitrate, NaNO3,was dissolved in water in a calorimeter, the temperature fell from 25.00oC to 21.56oC. If t

satela [25.4K]

Answer:

20.468 kilo Joules is the enthalpy change when one mole of sodium nitrate dissolves.

Explanation:

Heat lost by solution ad calorimeter = Q

Heat capacity of solution ad calorimeter = C = 1071 J/°C

Change in temperature = ΔT = 21.56°C - 25.00°C = -3.44°C

$Q=C\times Delta T$

$Q=1071 J/^oC\times (-3.44^oC)=-3,684.24 J$

Heat gained by sodium nitrate = -Q = -(-3,684.24 J)=3,684.24 J

Moles of sodium nitrate = $\frac{15.3 g}{85 g/mol}=0.18 mol$

When 0.18 mole of sodium nitrate was dissolved in water 3,684.24 joulesof heat was absorbed by it.

Then heat absorbed by 1 mole of sodium nitrate :

$\frac{3,684.24 J}{0.18}=20,468 J=20.468 kJ$

1 J = 0.001 kJ

20.468 kilo Joules is the enthalpy change when one mole of sodium nitrate dissolves.

8 0

2 years ago

In the Gizmo, solid ice is gray, liquid water is blue, and water vapor gas is light blue. Heat or Chill the water as needed. Wha

Sauron [17]

It would be a solid because at -20 °C it has turned to ice

7 0

3 years ago

A 1.00 liter solution contains 0.31 M hydrocyanic acid and 0.40 M sodium cyanide. If 0.100 moles of barium hydroxide are added t

andriy [413]

Explanation:

acid --> HCN

base --> KCN

now

another base NaOH is added

we know that

base will react with an acid

OH- + HCN ---> CN- + H20

we can see that

HCN is used up , so number of moles of HCN will decrease

CN- is being formed , so number of moles of CN- will increase.

A false

B false

C false

D true

E false

6 0

3 years ago