121⟩ What is the concentration, in parts per billion, of a solution that contains 1 microgram of solute per liter?
1 PPB
Chemistry
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176 Chemistry Questions And Answers
122⟩ Which element has the following ground-state electron configuration 1s22s22p6?
Neon
123⟩ To the nearest whole number, convert 0.300 atmosphere into millimeters of mercury, or torr
228 Millimeters Of Mercury, Or Torr
124⟩ According to Bronsted-Lowry definition, a base is
1. a proton donor
2. an electron donor
3. a proton acceptor
4. an electron acceptor
Answer: C
125⟩ Which of the following represents the simplest chemical formula
1. empirical formula
2. molecular formula
3. structural formula
4. primary formula
Answer: A
126⟩ Which of the following instruments would typically be used to measure the smallest quantities of mass
1. double-pan balance
2. triple-beam hanging balance
3. triple-beam platform balance
4. analytic balance
Answer: D
127⟩ The property of water which permits an insect to walk on water is
1. viscosity
2. surface tension
3. tensile strength
4. turgor pressure
Answer: B
128⟩ Which one of the following statements is true about the neutralization of an acid by a base
1. the pH decreases when the base is added to the acid
2. a salt and water are end products
3. gas is an end product
4. organic compounds are end products
Answer: B
129⟩ Magnesium can exist as three naturally occurring isotopes. These isotopes would all have the same
1. atomic weight
2. number of neutrons
3. number of protons
4. nucleus
Answer: C
130⟩ In the chemistry lab, for safety reasons, when a concentrated acid is mixed with water
1. the water is always added to the acid
2. the acid is always added to the water
3. these can only be mixed at cold temperatures
4. these can never be mixed
Answer: B
131⟩ Which of the following is NOT true of helium?
1. deep sea divers breath a mixture of helium and oxygen
2. breathing helium causes a temporary change in the pitch and quality of one’s voice
3. helium gas is commonly used by dentists as a mild anesthetic
4. a mixture of helium and neon gas produced the first gas laser
Answer: C
132⟩ Which of the following is true of bases
1. they give rise to hydrogen ions when dissolved in water
2. they are substances that accept or react with hydrogen ions
3. they always contain the hydroxide ion in it’s structure
4. they have a pH below 7
Answer: B
133⟩ Which of the following has the same electron configuration as neon
1. Ar
2. F
3. Cl-
4. Na+
Answer: D
134⟩ What element does the symbol Au stand for?
Gold
135⟩ Knowing that Iron has an atomic number of 26, how many protons and how many electrons does Fe+2 have?
26 Protons,
24 Electrons
136⟩ What is the common name of the molecule dihydrogen dioxide?
Hydrogen Peroxide
137⟩ What are the 4 physical states of matter?
Solid,
Liquid,
Gas,
Plasma
138⟩ The general term for the removal of salts from brackish water or seawater to make it usable is called
Desalination
139⟩ 4.0 liters of oxygen are mixed with 8.0 liters of nitrogen. Identify the solute and solvent in this mixture
Oxygen Is The Solute; Nitrogen Is The Solvent
140⟩ It is estimated that each person in the United States consumes an average of 100 pounds of sucrose each year. Which two simple sugars are linked to make a sucrose molecule?
Glucose And Fructose
