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3 years ago

Why does water roll off of dry ice?

1 answer:

8 0

It's a combination of carbon dioxide gas from the dry ice, and tiny water droplets.) ... The dry ice fog is heavier (denser) than air, so it sinks down. But it's less dense than water, so it floats on the water. The bubbles are heavier than air, but less dense than carbon dioxide fog, so they'll float on the fog.

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In a chemical reaction sodium and chlorine react to form sodium chloride. Which term names the sodium?

Damm [24]

Reactant is the answer
hope it helps

6 0

3 years ago

Read 2 more answers

What is the value for AG at 5000 K if AH = -220 kJ/mol and S= -0.05 kJ/(mol-K)?

Serhud [2]

Answer:

C. 30 kJ

Explanation:

Hello there!

In this case, in agreement to the thermodynamic definition of the Gibbs free energy, in terms of enthalpy of entropy:

$\Delta G= \Delta H-T\Delta S$

It is possible to calculate the required G by plugging in the given entropy and enthalpy as shown below:

$\Delta G=-220kJ/mol-5000K*-0.05kJ/mol*K\\\\\Delta G=30kJ/mol$

Therefore, the answer is C. 30 kJ .

Best regards!

4 0

2 years ago

Why are yeast cells used in making bread?

tatiyna

Answer:

Yeast is used for the leavening of bread. Yeast uses the sugars and oxygen in dough to produce more yeast cells and carbon dioxide gas. The carbon dioxide makes the dough rise which gives the bread a light and spongy texture. Yeast also works on the gluten network.

Explanation:

5 0

2 years ago

A mixture of helium, nitrogen, and oxygen has a total pressure of 752 mm Hg. The

NISA [10]

Answer: The partial pressure of oxygen in the mixture is 321 mm Hg

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

$p_{total}=p_{He}+p_{N_2}+p_{O_2}$

Given : $p_{total}$ = total pressure of gases = 752 mm Hg

$p_{He}$ = partial pressure of Helium = 234 mm Hg

$p_{N_2}$ = partial pressure of nitrogen = 197 mm Hg

$p_{O_2}$ = partial pressure of oxygen = ?

Putting in the values we get:

$752mmHg=234mmHg+197mmHg+p_{O_2}$

$p_{O_2}=321mmHg$

The partial pressure of oxygen in the mixture is 321 mm Hg

5 0

3 years ago

A 1.85 kg textbook is sitting on a bookshelf 2.23 m above the floor. How much potential energy does it have?

neonofarm [45]

Answer:

$\boxed {\boxed {\sf 40.4299 \ Joules}}$

Explanation:

Potential energy is energy due to position. It is the product of mass, height, and acceleration due to gravity.

$PE= m \times g \times h$

The mass of the textbook is 1.85 kilograms. Assuming this is on Earth, the acceleration due to gravity is 9.8 meters per square second. The height is 2.23 meters.