3 years ago

About what percent of US land is within the Mississippi River watershed?

Chemistry

1 answer:

Ad libitum [116K]3 years ago

3 0

I think it is about 60%.

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Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the following equation: CO2(s)→C

GREYUIT [131]

Answer:

$m=8.79kg$

Explanation:

First of all we need to calculate the heat that the water in the cooler is able to release:

$Q=\rho * V*Cp*\Delta T$

Where:

Cp is the mass heat capacity of water
V is the volume
$\rho$ is the density

$Q=1 g/cm^3 *15000 cm^3*4.184 \frac{J}{g*^{\circ}C}*(10-90)^{\circ}C$

$Q=-5020800 J=-5020.8 kJ$

To calculate the mass of CO2 that sublimes:

$-Q=\Delta H_{sub}*m$

Knowing that the enthalpy of sublimation for the CO2 is: $\Delta H_{sub}=571 kJ/kg$

$5020.8 kJ=571 kJ/kg*m$

$m=\frac{5020.8 kJ}{571 kJ/kg}=8.79kg$

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3 years ago

Which of the following is an example of maintaining homeostasis? A. Learning B. Jumping C. Shivering D. Smiling

yawa3891 [41]

Answer:

Shivering.

Explanation:

Homeostasis is the bodies need to keep things at a normal. When you are cold you shiver to produce body heat and get back to normal

5 0

3 years ago

A scientific ________ must have a control, so that the variables that could affect the out come is reduced. A:experiment B:concl

Lostsunrise [7]

Answer:

A.experiment

Explanation:

hope this helps

4 0

3 years ago

What is different about atoms after a redox reaction has happened?

klasskru [66]

The difference is the amount of oxygen in the compound

3 0

3 years ago

U ever get an answer

den301095 [7]

Yesn’t. they are either wrong or links

6 0

2 years ago