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ChemistryChemistry
Violet
Which metal is the best choice for recovering copper (reacting with copper) from the solution? Fe, Ag, Zn, or Al
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ChemistryChemistry
Sidney Arnold
How many liters of H2O are produces @ STP by the combustion of 30g of CH4 CH4+2O2---> CO2 + 2H2O
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ChemistryChemistry
Hayden Kramer
If the formation of NaCl proceeds according to the following equation and change in enthalpy, what is the reaction and change in enthalpy for the decomposition of 2 moles of NaCl? Na + ½Cl2→NaCl, ΔH = - 411 kJ
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ChemistryChemistry
Arellano
The metric unit of force is the

A. gram.

B. kilogram.

C. nanometer.

D. newton.
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ChemistryChemistry
Penelope Glenn
What needs to happen for a solute to dissolve in a particular solvent?

A) the attractions between the solute and solvent molecules must be greater than the attractions keeping the solute together and the attractions keeping the solvent together.

B) the attractions between the solute and solvent molecules must be greater than the attractions between the solvent particles.

C) the attractions between the solute and solvent molecules must be greater than the attractions between the solute particles.

D) the attractions between the solute and solvent molecules must be less than the attractions keeping the solute together and the attractions keeping the solvent together.
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ChemistryChemistry
Holloway
What are primary and secondary alkanols
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ChemistryChemistry
Aiyana Henderson
Hydrogen is 99% hydrogen-1; 0.8% hydrogen-2; and 0.2% hydrogen-3. calculate it's average atomic mass
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ChemistryChemistry
Yang
Uranium-235 has a half-life of 713 million years. Would uranium-235 or carbon-14 be more useful for dating a fossil from Precambrian Time? Explain.
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ChemistryChemistry
Guillermo Gregory
Earth's oceans contain many dissolved elements like calcium, sodium, and chlorine. These elements plus several others combine to form the salts in the oceans. What is a major source of calcium and sodium in oceans? A) air pollutants B) gases from active volcanoes C) minerals dissolved in aquifers D) weathering and erosion of rocks
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ChemistryChemistry
Gunnar Hanna
What is physical change in chemistry?
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ChemistryChemistry
Guest
Testable question: does the water need to be hot or cold to make a cloud.

What data can I use for my science project
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ChemistryChemistry
Leilani Santiago
Carbohydrate metabolic enzymes bind D-glucose specifically. D-glucose has an estimated caloric value of 1 k. cal per 4 grams of carbohydrate.

Based on the methods used to convert the energy of D-glucose into a useable form, what would you estimate the caloric value of L-glucose to be using the same method?

A) 1 k. cal per 4 grams

B) 1 k. cal per 2 grams

C) 1 k. cal per 8 grams

D) 0 k. cal per 4 grams

E) 2 k. cal per 8 grams
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ChemistryChemistry
Maddison Harvey
An atom in the excited state can have an electron configuration of
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Richards
4fe (s) + 3o2 (g) →2fe2o3 (s) how many grams of Fe2O3 are produced when 12.0 of iron rusts
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ChemistryChemistry
Marin Sawyer
Chromium 6 is commonly referred to as?
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