Chemistry » Page 149

Chemistry

Cecilia

A sample of calcium carbonate, caco3 (s) absorbs 45.5 j of heat, upon which the temperature of the sample increases from 21.1 °c to 28.5 °c. if the specific heat of calcium carbonate is 0.82 j/g·˚c, what is the mass (in grams) of the sample?

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Chemistry

Makenzie Leon

Which compound has the smallest mass. H2O CO H2O2 CO2

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Chemistry

Jordan

Compare the mass of an ice cube to the mass of the water once the cube is completely melted.

A) The mass of water formed equals the mass of ice.

B) The mass of water formed is more than the mass of ice.

C) The mass of water formed is less than the mass of ice.

D) The mass of water formed does not depend on the mass of ice.

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Chemistry

Adan Mercer

Is the process by which certain waste materials, such as plastic, glass, aluminum, and paper, are prepared for reuse.

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Chemistry

Tatiana Kerr

What are the three categories of scientific reasoning described by Aristotle

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Chemistry

Raelynn Zuniga

A sample of oxygen gas occupies 3.60 liters at a pressure of 1.00 atm. If the temperature is held constant, what will be the volume of the oxygen gas at a pressure of 2.50 atm?

0.694 L

1.44 L

4.35 L

9.20 L

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Chemistry

Julie Hutchinson

How many grams of copper, cu are

there in 2.55 mol of cu?

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Chemistry

Pepe

Place the following elements in order of decreasing atomic size:

a. lead

b. phosphorus

c. oxygen

d. cesium

e. barium

f. silicon.

Rank below mention elements from largest to smallest.

a. Cs

b. O

c. P

d. Si

e. Ba

f. Pb

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Chemistry

Cloe Warren

Explain how gas pressure is measured.

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Chemistry

Chevy

Which sequence describes the result of increasing the number of gas particles in a container

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Chemistry

Robert Holder

Indicate the SI base units or derived units that are appropriate for the following measurements:

(a) The mass of moon

(b) The distance from Dallas to Oklahoma City

(c) The speed of sound

(d) The density of air

(e) The temperature at which alcohol boils

(f) The area of the state of Delaware

(g) The volume of a flu shot or a measles vaccination

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Chemistry

Angie Chambers

What happens when the pressure of a gas is decreased?

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Chemistry

Jerimiah Dougherty

A sealed container holds 0.020 moles of nitrogen (n2) gas, at a pressure of 1.5 atmospheres and a temperature of 290 k. the atomic mass of nitrogen is 14.0 g/mol. the boltzmann constant is 1.38 * 10-23 j/k and the ideal gas constant is r = 8.314 j / mol · k = 0.0821 l · atm/mol · k. the mass density of the gas is closest to

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Chemistry

Carolina Pham

What type of substance do these statements describe?

- It is a long chain.

- It contains carbon, hydrogen, and oxygen atoms.

- It has double bonds.

- It is insoluble in water.

- It is used for energy storage in living things.

carbohydrate

lipid

monosaccharide

protein

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Chemistry

Melany Simpson

Whats the factor you observe or measure during an experiment

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