Chemistry » Page 103

Chemistry

Karter Guzman

Heat is added to a 200.-gram sample of H2O (s) to melt the sample at 0°C. Then the resulting H2O () is heated to a final temperature of 65°C. Determine the total amount of heat required to completely melt the sample. Heat is added to a 200.-gram sample of H2O (s) to melt the sample at 0°C. Then the resulting H2O () is heated to a final temperature of 65°C. Determine the total amount of heat required to completely melt the sample.

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Chemistry

Bobby

What perccent of the atmosphere is made up of carbon dioxe?

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Chemistry

Jerry Short

which of these is an example of a chemical change A breaking glass B mealting ice on a windshield C burning gasoline D denting a bumper

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Chemistry

Raison

What happens as the activation energy increases

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Chemistry

Brylee Howell

What is internal energy is

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Chemistry

Serenity Nash

O-18, an isotope of oxygen, has a stable nucleus. O-19, another isotope of oxygen, does not have a stable nucleus. Based on this information, which statement is correct?

O-19 is radioactive; O-18 is not radioactive.

O-19 has a mass defect; O-18 does not have a mass defect.

O-19 has a nuclear binding energy; O-18 does not have a nuclear binding energy.

O-19 has more neutrons than protons; O-18 has equal numbers of neutrons and protons

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Chemistry

Guest

Is this reaction endothermic or exothermic

d) NH4NO3 (s)  NH4 + (aq) + NO3 - (aq) [Note, this is the reaction that takes place in a cold pack]

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Chemistry

Miriam

Who developed a system of classifying organisms by genus and species

A) Darwin

B) Linnaeus

C) Watson

D) Mendel

P. S. - This is Science not Chemistry

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Chemistry

Ana Gilmore

Describe how formal charges are used to choose between possible molecular structures

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Chemistry

Braxton Callahan

What is the difference between a strong and weak base? select the best choice below to explain the difference. choose one:

a. strong bases are strong electrolytes and are completely ionized in solution. weak bases are weak electrolytes and produce limited quantities of the hydrogen ion h + (aq).

b. strong bases are strong electrolytes and are completely ionized in solution. weak bases are weak electrolytes and are only partially ionized in solution.

c. strong bases are strong electrolytes and produce abundant quantities of the hydrogen ion h + (aq). weak bases are weak electrolytes and are only partially ionized in solution.

d. none of the above.

e. strong bases are strong electrolytes and are partially ionized in solution. weak bases are weak electrolytes and are completely ionized in solution?

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Chemistry

Terrance Mcbride

The Molecule Is ___

A) Symmetrical and Polar

B) Symmetrical and non polar

C) Asymmetrical and polar

D) Asymmetrical and non polar

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Chemistry

Levine

Fill in the blanks:

Note: both blanks are the same word

The weight on an object depends on its (blank) and the (blank) of earth.

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Chemistry

Whiz

Why would putting argon and pottassium in order of there atomic masses be wrong

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Chemistry

Daphne Baxter

How many moles of calcium chloride (CaCl2) are needed to react completely with 6.2 moles of silver nitrate (AgNO3) ?

2AgNO3 + CaCl2 → 2AgCl + Ca (NO3) 2

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Chemistry

Maxwell Black

A block of aluminum has the dimensions: length 5cm, width 3cm and height 1cm and weighs 40.5 g. What is its density?

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