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Question
Do the following represent elements in a group, a period, or neither?A) period
B) group
C) neither
1> Li, C, F
2> F, S, P
3> O, S, Se
4> He, H, I
Answer
This answer is hidden. It contains 24 characters.
Related questions
Q:
Identify the Brnsted-Lowry acids in the following reaction.H2O + CO32- ->HCO3- + OH-A) H2O/HCO3-B) CO32-/HCO3-C) OH-/HCO3-D) CO32-/OH-E) H2CO3/H2O
Q:
According to the Brnsted-Lowry definition,
A) an acid is a proton acceptor.
B) a base produces H+ ions in aqueous solutions.
C) a base is a proton donor.
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E) an acid acts as the solvent.
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A catalyst lowers the activation energy of a chemical reaction.
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B) product.
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In the reaction of nitrogen gas with oxygen gas to produce nitrogen oxide, what is the effect of adding more oxygen gas to the initial reaction mixture? The reaction is shown below.N2(g) + O2(g) -> 2NO(g)A) The equilibrium shifts to produce more N2.B) The equilibrium shifts to produce more NO.C) The equilibrium is not affected.D) Extra catalyst is required to reach equilibrium.E) The temperature of the reaction mixture is raised.
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B) regulation.
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Q:
When a reaction is at equilibrium,
A) all reaction stops.
B) no more reactants are converted to products.
C) the reaction is no longer reversible.
D) the forward and reverse reactions occur at the same rate.
E) the products and reactants have the same energy content.
Q:
A chemical reaction has reached equilibrium when
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Q:
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Q:
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Q:
0.50 mole of KCl is added to 2.0 kg of water. The boiling point of the solution will be ________ the boiling point of pure water.
A) higher than
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B) starch outside
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D) water inside only
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Q:
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A) water
B) 0.5% NaCl
C) 2% glucose
D) 0.9% NaCl
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Q:
During the process of diluting a solution to a lower concentration,
A) the amount of solute does not change.
B) the amount of solvent does not change.
C) there is more solute in the concentrated solution.
D) the volume of the solution does not change.
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Q:
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Q:
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Q:
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Q:
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Q:
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Q:
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B) CaCl2, soluble in hexane
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Q:
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A) the Cl- ions are attracted to dissolved K+ ions.
B) the Cl- ions are attracted to the partially negative oxygen atoms of the water molecule.
C) the K+ ions are attracted to Cl- ions on the KCl crystal.
D) the K+ ions are attracted to the partially negative oxygen atoms of the water molecule.
E) the K+ ions are attracted to the partially positive hydrogen atoms of the water molecule.
Q:
A solution is prepared by dissolving 2 g of KCl in 100 g of H2O. In this solution, H2O is the
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B) solvent.
C) solution.
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E) ionic compound.
Q:
Which of the following molecules can form hydrogen bonds?
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Q:
STP stands for 25 C and 760 mmHg.