Chemistry » Page 49

Chemistry

Warren Mann

Which of the following shows no reaction with acid?

A. copper

B. copper carbonate

C. magnesium carbonate

D. magnesium

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Chemistry

Bodie

Describe what happens to salt when it dissolves in water.

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Chemistry

Gunnar Lowe

The functional group, - CHO, is characteristic of an:

ketone

aldehyde

organic acid

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Chemistry

Chaim Vega

In the experiment, you added water to the reaction vessel after the reaction was complete, but we did not discuss why. Based on what happened after adding the water, which of the following is the reason for the addition of water?

A. lower the solubility of the product in solution so it precipitated out

B. increase the solubility of the product in solution so it precipitated out

C. lower the solubility of the product in solution so it stayed in solution

D. increase the solubility of the product in solution so it stayed in solution

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Chemistry

Jewel Salinas

If a weather map has a symbol that shows a circle with an H in the middle, what is it

referring to?

A.) high pressure

B.) high weather

C.) high temperature

D.) humid weather

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Chemistry

Zachery Stanton

The freons are a class of compounds containing carbon, chlorine, and fluorine. while they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere. in 1991, two replacement compounds for freons went into production: hfc-134a () and hcfc-124 (). calculate the molar masses of these two compounds.

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Chemistry

Crystal Ballard

How will you describe the pathway of oxygen in the breathing system?

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Chemistry

Victoria Ibarra

Match the standard reduction potentials for each half reaction and the electric potential for the voltaic cell.

Given:

half-cell:

Be

2

+

∣

Be

reduction half-reaction:

Be

2

+

+

2

e

_

→

Be

E

0

=

half-cell:

Hg

2

+

∣

Hg

reduction half-reaction:

Hg

2

+

+

2

e

_

→

Hg

E

0

=

anode:

Be

2

+

cathode:

Hg

2

+

E

cell

0

=

E

cathode

0

-

E

anode

0

E

cell

0

=

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Chemistry

Muhammad Sharp

Which of the following is NOT a unit used to measure temperature?

Question 20 options:

Kelvin

Watt

Celsius

Fahrenheit

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Chemistry

Alfred Lamb

If the reaction to form water were written h2 (g) + 12o2 (g) →h2o (g), would you expect the same value of δh as in equation 2h2 (g) + o2 (g) ⟶2h2o (g) δh=-483.6kj?

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Chemistry

Declan Stevenson

Write, Balance and Label the type of reaction: Potassium Hydroxide plus phosphoric acid yields potassium phosphate and water.

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Chemistry

Nataly Vasquez

How do molecules appear in gas

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Chemistry

Alyvia

Iron has a density of 7.86 g/cm3. Calculate the volume (in dL) of a piece of iron having a mass of 4.77 kg. Note that the density is provided in different units of volume and mass than the desired units of volume (dL) and the given units of mass (kg). You will need to express the density in kg/dL (1 cm3 = 1 mL) before calculating the volume for the piece of iron.

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Chemistry

Adonis Harding

What is the empirical formula for a compound

with the molecular formula C6H12Cl2O2?

(1) CHClO (3) C3H6ClO

(2) CH2ClO (4) C6H12Cl2O2

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Chemistry

Cornelius Wilkinson

7. The molar mass of carbon is 12.0 g/mol, of hydrogen is 1.0 g/mol, and of oxygen is 16.0 g/mol.

How would you calculate the molar mass of ethanol (C2H60) ?

• 9 mol * 6.02 x 10^23g

• 2 x 12.0g/mol + 1 x 16.0 g/mol

• 9 mol (12.0 g/mol + 1.0 g/mol + 16 g/mol)

• 12.0 g / mol + 1.0 g/mol + 16 g/mol

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