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Ellen Ross
ChemistryChemistry
A 12.5-g marble display 5.0 mL of water. What is its density?
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Aubrey Davies
ChemistryChemistry
What is the purpose of a catalyst in the production of hydrogen?
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Clelia
ChemistryChemistry
What is the correct way to prepare a 1 molar solution of kno3?
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Annie Galloway
ChemistryChemistry
The three most common phases of matter are
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Akira Sampson
ChemistryChemistry
How many oxygen atoms in 2.28 mol HNO3?
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Dean Burgess
ChemistryChemistry
How much heat is released if 7.15 g cao (s) is added to 152 g of h2o (l) ? cao (s) + h2o (l) → ca (oh) 2 (s) δh°rxn = - 64.8 kj/mol?
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Yareli Joyce
ChemistryChemistry
Hydrogen sulfide gas and sulfur dioxide gas react to form solid sulfur and water. If 10.0g of gaseous hydrogen sulphide is mixed with 10.0g of gaseous sulfur dioxide, how many grams of solid sulfur can form?
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Nellie
ChemistryChemistry
Describe the contributions of the following scientists to our knowledge of atomic structure: J. J. Thomson, R. A. Millikan, Ernest Rutherford, and James Chadwick
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Victor Hogan
ChemistryChemistry
If you have 400 grams of a substance that decays with a half-life of 14 days, then how much will you have after 56 days?
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Paulina
ChemistryChemistry
As an electron gains energy, it becomes excited and jumps to a lower energy level?
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Jeffrey Gates
ChemistryChemistry
If 3.011 x 1023 molecules have a mass of 20.04 grams, what is the molar mass of this substance?
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Bentley Downs
ChemistryChemistry
What is the precipitation reaction of sodium nitrate and lead (II) ?
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Wyatt
ChemistryChemistry
The factor that affects how easily an electron can be removed from an atom is the

A. surrounding atoms.

B. temperature of the environment.

C. size of the atom.

D. structure of the atom.
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Nathan Harvey
ChemistryChemistry
NaCl

in roman numerals
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Giovanna Middleton
ChemistryChemistry
A compound has an empirical formula of C2H6. What additional piece of evidence is needed to determine the molecular formula?

a. percent composition of carbon

b. mass of the sample

c. relative numbers of atoms of each element

d. molar mass of the compound
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