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Keshawn Blanchard
ChemistryChemistry
The early paleozoic dominated by

A. reptiles

B. amphibians

C. fish

D. inverterbrates
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Dana Cunningham
ChemistryChemistry
Each element in the periodic table is assigned an atomic number. This number is the same as?
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Bradley Khan
ChemistryChemistry
Molecular chlorine and molecular fluorine combine to form a gaseous product. Under the same conditions of temperature and pressure it is found that one volume of cl2 reacts with three volumes of f2 to yield two volumes of the product. What is the formula of the product?
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Paul
ChemistryChemistry
A sample of gaseous neon atoms at atmospheric pressure and 0 °c contains 2.69 * 1022 atoms per liter. the atomic radius of neon is 69 pm. what fraction of the space do the atoms occupy? what does this reveal about the separation between atoms in the gaseous phase?
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Carlos Dominguez
ChemistryChemistry
Cobalt-60 positron emission
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Ismael
ChemistryChemistry
Which of the following statements is true?

Minerals can be liquids.

Emeralds are more common than quartz.

Minerals must be organic.

Minerals can be elements or compounds.
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Gabriella
ChemistryChemistry
Why is calcium oxide CaO, and not CaO2?
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Taniya Howard
ChemistryChemistry
Much of the mass of an atom is concentrated in its nucleus. The nucleus contains, and the outer part of the atom contains.
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Keon Avery
ChemistryChemistry
How many grams are 53.8 of oxygen
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Clinton
ChemistryChemistry
Which are causes of mechanical weathering? Select three options.

EO

acid rain

plant growth

animal actions

carbon dioxide

pressure release
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Cassius
ChemistryChemistry
How many valence electrons does O-2 have?
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Santiago
ChemistryChemistry
How many significant figures are understood for the number in the following definition: 1 mil = 5280 ft
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Kelsey Orozco
ChemistryChemistry
Hydrophobic molecules (like oil) tend to self-associate in water rather than dissolve. What is the MAJOR energetic contribution to this property.
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Aron Schroeder
ChemistryChemistry
If you subtract an objects starting velocity from its final velocity and divide by the time it took to change velocity, what are you finding
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Braiden Brewer
ChemistryChemistry
Which of the following statements is true about cellular respiration?

It converts energy into food,

It breaks down food to release energy,

It turns carbon dioxide into water.

It tums water into carbon dioxide.
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