Chemistry » Page 65

Chemistry

Danny Adams

A 1.2 L weather balloon on the

ground has a temperature of 25°C

and is at atmospheric pressure (1.0

atm). When it rises to an elevation

where the pressure is 0.74 atm,

then the new volume is 1.8 L. What

is the temperature (in °C) of the air

at this elevation?

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Chemistry

Dylan Herman

Why carbon dioxide is poisonus

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Chemistry

Kristen

Aurelie is doing a lab in her chemistry class. Her teacher defined a calorie as the amount of energy needed to raise the temperature of one gram of water one degree Celsius. Aurelie has measured 300 grams of water into a beaker and

recorded its initial temperature as 20°C

How many calories does Aurelie need to increase the temperature of the water to 25° Celsius? Give your answer in calories and

Calories.

A. 1.500 Calories or 1.50 calories

B. 1.500 Calories or 150.0 calories

C. 1,500 calories or 15.0 Calories

D. 1.500 calories or 1.50 Calories

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Chemistry

Ali

What is the difference between the carbon allotropes diamond and graphite

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Chemistry

Kianna Frost

What is the pressure of 0.500 moles of carbon dioxide gas in a 2.5 L tank and at a temperature of 301 K? (R=0.0821 L·atm/mol·K

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Chemistry

Jamison Steele

If there is a 50kg block on earth, then what is the blocks weight?

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Chemistry

Malcolm Fernandez

Which element has the most electrons in is highest energy level?

A. Carbon

B. Iron

C. Bromine

D. Calcium

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Chemistry

Jimmy Barry

MnO2 + 4 HCl → Cl2 + MnCl2 + 2 H2O

Given 145.7 grams of MnO2, how much hydrochloric acid (HCl) is needed to use up the MnO2 completely (MM in g/mol: MnO2=86.94, HCl = 36.46, Cl2=70.9, MnCl2=125.84, H2O=18.02) ?

244.4 g

10.55 g

145.5 g

1407 g

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Chemistry

Julissa Cummings

The heat of vaporization of water at 100°C is 40.66 kJ/mol. Calculate the quantity of heat that is absorbed/released when

a. 8.00 g of steam condenses to liquid water at 100°C.

b. 18.1 kJ of heat are absorbed.

c. 91.6 kJ of heat are released.

d. 91.6 kJ of heat are absorbed.

e. 18.1 kJ of heat are released.

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Chemistry

Xander Richard

In radiation therapy,

a. isotopes are traced through a chemical reaction.

b. un6y human cells are destroyed.

c. radioactive isotopes are used as fuel.

d. weak spots in water pipes are found.

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Chemistry

Josiah Orr

What is density of an apple

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Chemistry

Alyvia

Describe the pat of a carbon atom through the process of cellular respiration

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Chemistry

Matteo Golden

Write the complete electron configuration for the common monatomic ion formed by the element calcium, ca.

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Chemistry

Karter Rasmussen

What is the ph of a solution that results from mixing together equal volumes of a 0.020 m solution of ammonia and a 0.010 m solution of hydrochloric acid? (pka of nh4 + = 9.25) ?

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Chemistry

Kramer

What are Photosyntheis?

. how plants make their food

. how aminal hurt

. how plant get water

. how rain is made

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