Question 1

After taking your biology exam,you return to your car only to find that you had left the lights on and now the car battery is dead.Your friend offers to jump-start your car,but when you go to hook up the jumper cables you find that the battery terminals are covered with corrosion due to battery acid condensation.Based off your knowledge,what substance could be used to clean the corrosion?

Accepted Answer

Baking soda (sodium bicarbonate) is a mildly basic substance with a pH of 9, making it effective in neutralizing the acidic corrosion on the battery terminals. It can be mixed with water to form a paste and applied to the terminals with a brush or cloth to remove the corrosion.

Question 2

One mole of a substance contains 6.02 x 10²³ molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Accepted Answer

To calculate the weight of 3 moles of Li, we need to first find the molar mass of Li which is approximately 6.94 g/mol (since atomic mass is approximately 7). Then we can calculate the weight of 3 moles of Li as:
Weight = 3 moles x 6.94 g/mol = 20.82 g ≈ 21 g (rounding to the nearest whole number)
Therefore, the answer is B.

Question 3

Plants transport water to their leaves through the xylem when water evaporates from the leaves.The evaporating water pulls other water molecules up the xylem through ________.

Accepted Answer

Water molecules are held together by hydrogen bonds, and the evaporation of water from the leaves creates a tension that pulls other water molecules up the xylem column through the hydrogen bonds. Ionic bonds and covalent bonds are not involved in this process. Hydrophobic interactions refer to the tendency of nonpolar hydrophobic molecules to cluster together in the presence of water, and are also unrelated to xylem transport.

Question 4

To increase the rate of a reaction you could:

Accepted Answer

Adding more reactants will increase the concentration of the reactants, which will increase the frequency of successful collisions between them and increase the rate of the reaction. The other choices would not necessarily increase the rate of the reaction, and in some cases like removing a catalyst, it could potentially decrease the rate of the reaction.

Question 5

You identify an enzyme involved in a cellular reaction.How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Accepted Answer

Enzymes do not alter the reaction equilibrium but rather accelerate the rates at which the reaction occurs, which shortens the time needed to reach equilibrium. This is because enzymes lower the activation energy required for the reaction to occur, making it easier for the reactants to convert into products.

Question 6

Water is most dense and thus heaviest at 4°C.At 0°C,ice forms and can float on liquid water.Suppose ice were most dense at 0^°C.What would happen in a lake at this temperature?

Accepted Answer

If ice were most dense at 0°C, it would sink to the bottom of the lake, as it is heavier than liquid water at this temperature. Over time, the layers of ice would build up on the bottom of the lake. This would create a barrier between the water and the atmosphere, preventing further heat transfer and reducing the rate of ice formation, but it would not prevent ice formation altogether.

Question 7

Which atomic particle has no charge and is located in the nucleus?

Accepted Answer

The neutron is a subatomic particle that is located in the nucleus of an atom and has no charge, making it neutral. The proton has a positive charge and the electron has a negative charge. An ion is an atom or molecule that has gained or lost electrons and therefore has a net electrical charge. Isotopes are atoms of the same element that have different numbers of neutrons, but they still have a charge due to their protons and electrons.

Question 8

An atom that is negatively charged because it has accepted an electron is a(n):

Accepted Answer

An ion is an atom that has gained or lost electrons, resulting in a net electrical charge. In this case, the atom has gained an electron and therefore has a negative charge.

Question 9

Consider the following electronegativity values: Boron (B)= 1.8
Carbon (C)= 2.5
Chlorine (Cl)= 3.2
Selenium (Se)= 2.6
Which of the following bonds is the most polar?

Accepted Answer

The polarity of a bond is determined by the difference in electronegativity between the two atoms involved. The greater the difference, the more polar the bond. Here, the difference in electronegativity between Boron (B) and Chlorine (Cl) is the greatest (3.2 - 1.8 = 1.4), making the B-Cl bond the most polar among the options provided.

Question 10

As you and a friend are entering a chemistry laboratory at your university,you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE.Your friend is an accounting major and has not had any science courses yet.She asks you what a radioactive isotope is and you respond correctly with:

Accepted Answer

Radioactive isotopes are unstable atoms that emit energy in the form of radiation, which can be harmful to living organisms. It is important to take all necessary precautions when working with radioactive materials to avoid exposure to radiation.

Question 11

Your dog becomes ill and you rush him to the veterinarian's office.A technician draws blood from your dog's leg for a vet-ordered lab test.After a few minutes the lab results are given to the vet,who immediately grabs a bottle from a shelf and begins to fill a syringe with an unknown fluid.You inquire about the fluid,and the vet informs you that the fluid is necessary to manage your dog's metabolic acidosis.Based on the information provided,what is acidosis,and what is the likely effect of the veterinarian's injection?

Accepted Answer

Acidosis is a condition where the blood pH drops below the normal level, indicating an excess of acid in the body. The injection given by the veterinarian is likely a buffering solution, which will help to neutralize the excess acid and restore a proper blood pH level. Saline would not be effective in reversing acidosis. A pH level that has increased would suggest alkalosis, which would require a different treatment.

Question 12

The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s²2s²2p⁶.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

Accepted Answer

The electronic configuration of Argon, with atomic number 18, can be determined by adding electrons to the configuration of Neon, which has atomic number 10. Argon has 8 additional electrons, and these can be added to the next available energy levels and sublevels. The correct electronic configuration is 1s2 2s2 2p6 3s2 3p6, which is equivalent to 1s²2s²3s²3p⁶. Therefore, the correct answer is choice C.

Question 13

The sub-atomic particle with a positive charge is ________.

Accepted Answer

A proton is a sub-atomic particle that has a positive charge. Electrons have a negative charge, ions are atoms or molecules with a net electrical charge (which can be either positive or negative), neutrons have no electrical charge, and isotopes are different forms of the same element with the same number of protons but varying numbers of neutrons.

Question 14

You walk down into your basement to find that the carpeting on the floor is damp.Concerned,you look around for large puddles of water or broken pipes,but find none.In fact,only the basement floor and carpeting is damp.You realize that water must have wicked into the carpet from the floor by ________.

Accepted Answer

Adhesion (the attraction between water molecules and the carpet fibers) and cohesion (the attraction between water molecules themselves) are responsible for water wicking into the carpet. Solubility is not directly involved in the process of water moving through the carpet fibers.

Question 15

The amino acid glycine (C₃NO₂H₆)is a(an):

Accepted Answer

Glycine consists of carbon, hydrogen, nitrogen, oxygen, and sulfur, making it an organic molecule. It is an amino acid and a building block of proteins. It is not an element, as it is composed of multiple elements, and it is not a vitamin, as it is not an essential nutrient that must be obtained from the diet.

Question 16

The half-life of Carbon-14 is approximately 5,700 years.Using this information scientists have been able to determine the age of some artifacts left by humans.A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered.She removed the wood (with permission)to her laboratory.Her wood sample contained 2 grams of Carbon-14.If the age of the wood was determined to be 22,800 years old,how much Carbon-14 originally existed in this piece of wood?

Accepted Answer

The half-life of Carbon-14 is 5,700 years. This means that after 5,700 years, half of the Carbon-14 in a sample will have decayed. After another 5,700 years, half of the remaining Carbon-14 will have decayed, and so on.The scientist found that her wood sample contained 2 grams of Carbon-14. She determined that the age of the wood was 22,800 years old. This means that the wood originally contained 32 grams of Carbon-14 (2 grams x 2^4 = 32 grams).

Question 17

Capillary action is one of the forces that aids water's upward movement in plants.The narrower the diameter of the tube,the farther the water column will rise.Capillary action is a result of water molecules:

Accepted Answer

Capillary action is a result of water's adhesive force, which allows water molecules to attach to the surrounding vessel walls and climb upward, against the pull of gravity. This adhesive force is stronger than the force of gravity on the water's mass, which allows it to be pulled upward in narrow tubes or spaces.

Question 18

The smallest subatomic particle is the ________.

Accepted Answer

Electrons are the smallest subatomic particles with a mass of 0.0005 atomic mass units (amu) and a negative charge. Ions are atoms or molecules that have a net electrical charge due to the loss or gain of electrons. Isotopes are atoms that have the same number of protons but different numbers of neutrons in their nucleus. Neutrons are subatomic particles with a mass of 1 amu and no electrical charge. Protons are subatomic particles with a mass of 1 amu and a positive charge.

Question 19

The reaction (H₂ + F₂→ 2HF)is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H₂ → 2H⁺+ 2e^-)is a(n):

Accepted Answer

The given half reaction involves the loss of electrons (oxidation) as HS1U1B12S1U1B0 is converted to HS1U1P1+. Hence, it is an oxidation reaction.

Question 20

The two nitrogen atoms in nitrogen gas (N₂)share six electrons forming a ________.

Accepted Answer

Nitrogen gas is composed of two nitrogen atoms, which share three pairs of electrons, forming a triple covalent bond. This is the strongest type of covalent bond and is necessary to hold the two nitrogen atoms together.

Quiz 2: The Nature of Molecules and the Properties of Water

One mole of a substance contains 6.02 x 10²³ molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Plants transport water to their leaves through the xylem when water evaporates from the leaves.The evaporating water pulls other water molecules up the xylem through ________.

To increase the rate of a reaction you could:

You identify an enzyme involved in a cellular reaction.How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Water is most dense and thus heaviest at 4°C.At 0°C,ice forms and can float on liquid water.Suppose ice were most dense at 0^°C.What would happen in a lake at this temperature?

Which atomic particle has no charge and is located in the nucleus?

An atom that is negatively charged because it has accepted an electron is a(n) :

Consider the following electronegativity values: Boron (B) = 1.8 Carbon (C) = 2.5 Chlorine (Cl) = 3.2 Selenium (Se) = 2.6 Which of the following bonds is the most polar?

As you and a friend are entering a chemistry laboratory at your university,you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE.Your friend is an accounting major and has not had any science courses yet.She asks you what a radioactive isotope is and you respond correctly with:

The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s²2s²2p⁶.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

The sub-atomic particle with a positive charge is ________.

The amino acid glycine (C₃NO₂H₆) is a(an) :

Capillary action is one of the forces that aids water's upward movement in plants.The narrower the diameter of the tube,the farther the water column will rise.Capillary action is a result of water molecules:

The smallest subatomic particle is the ________.

The reaction (H₂ + F₂→ 2HF) is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H₂ → 2H⁺+ 2e^-) is a(n) :

The two nitrogen atoms in nitrogen gas (N₂) share six electrons forming a ________.

Quiz 2: The Nature of Molecules and the Properties of Water

One mole of a substance contains 6.02 x 1023 molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Plants transport water to their leaves through the xylem when water evaporates from the leaves.The evaporating water pulls other water molecules up the xylem through ________.

To increase the rate of a reaction you could:

You identify an enzyme involved in a cellular reaction.How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?

Water is most dense and thus heaviest at 4°C.At 0°C,ice forms and can float on liquid water.Suppose ice were most dense at 0°C.What would happen in a lake at this temperature?

Which atomic particle has no charge and is located in the nucleus?

An atom that is negatively charged because it has accepted an electron is a(n) :

Consider the following electronegativity values: Boron (B) = 1.8 Carbon (C) = 2.5 Chlorine (Cl) = 3.2 Selenium (Se) = 2.6 Which of the following bonds is the most polar?

As you and a friend are entering a chemistry laboratory at your university,you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE.Your friend is an accounting major and has not had any science courses yet.She asks you what a radioactive isotope is and you respond correctly with:

The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s22s22p6.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

The sub-atomic particle with a positive charge is ________.

The amino acid glycine (C3NO2H6) is a(an) :

Capillary action is one of the forces that aids water's upward movement in plants.The narrower the diameter of the tube,the farther the water column will rise.Capillary action is a result of water molecules:

The smallest subatomic particle is the ________.

The reaction (H2 + F2 → 2HF) is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2 → 2H+ + 2e-) is a(n) :

The two nitrogen atoms in nitrogen gas (N2) share six electrons forming a ________.

One mole of a substance contains 6.02 x 10²³ molecules.The atomic number of Li is 3 and the atomic mass is approximately 7.If you have three moles of Li,how many grams does it weigh?

Water is most dense and thus heaviest at 4°C.At 0°C,ice forms and can float on liquid water.Suppose ice were most dense at 0^°C.What would happen in a lake at this temperature?

The electronic configuration of the noble gas Neon,which has an atomic number of 10,can be written as follows: 1s²2s²2p⁶.What is the electronic configuration of the noble gas Argon,which has an atomic number of 18?

The amino acid glycine (C₃NO₂H₆) is a(an) :

The reaction (H₂ + F₂→ 2HF) is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H₂ → 2H⁺+ 2e^-) is a(n) :

The two nitrogen atoms in nitrogen gas (N₂) share six electrons forming a ________.