Question 1

Examine the apparatus shown in the following image.  This apparatus would useful in which of the following separations?

Accepted Answer

The apparatus shown is a distillation setup, which is used to separate a mixture of two miscible liquids with different boiling points. Rubbing alcohol and water are miscible liquids with different boiling points, making this the best choice for using the apparatus shown.

Question 2

Consider the particulate-level illustration:  Which is the best classification of this particle?

Accepted Answer

The particle in the illustration appears to be made up of two or more atoms chemically bonded together, which constitutes a molecule. It is not a crystalline solid, mixture or heterogeneous mixture, as there is no indication of a mixture of substances or a repeating crystalline structure.

Question 3

Which of the following are compounds? i.Carbon dioxide ii.Silicon iii.Sodium carbonate iv.I₂ v.Cr

Accepted Answer

i. Carbon dioxide (CO2) is a compound. ii. Silicon (Si) is an element, not a compound. iii. Sodium carbonate (Na2CO3) is a compound. iv. I₂ is not a recognized chemical formula. v. Cr is an element, not a compound.

Question 4

Which of the following changes is/are exothermic for the underlined object?
i.ice melts
ii.hot french fries cool
iii.a beaker warms as chemicals react within it
iv.a hot plate warms a beaker of water
v.water evaporates off of skin

Accepted Answer

ii. Hot french fries cooling is an exothermic process because heat is released from the fries to the surrounding environment.

Question 5

Which of the following are elements?
i.KOH
ii.Ne
iii.CO
iv.Carbon tetrachloride
v.Calcium

Accepted Answer

Neon (Ne) and Calcium (Ca) are elements. Carbon tetrachloride (CCl4) and KOH (potassium hydroxide) are compounds. CO is a molecule consisting of two different elements (carbon and oxygen). Therefore, the only elements listed are Ne and Ca, so the answer is D, ii and v.

Question 6

Consider the particulate-level illustration:  Which is the best classification of this particle-level illustration?

Accepted Answer

The illustration shows a repeating pattern of particles, indicating that it is a crystalline solid. The particles are not individual atoms or molecules, but rather a repeated arrangement of atoms or molecules, so options A, B, and E can be ruled out. Option C is not specific enough, as there are different types of solids (amorphous, crystalline, etc.), but option D accurately describes the structure shown in the illustration.

Question 7

Which of the following particulate-level picture might be associated with the name "silver"?

Accepted Answer

The silver particle is known to have a face-centered cubic (FCC) structure. Among the given choices, only choice B shows an FCC structure.

Question 8

Which of the following is false?

Accepted Answer

All statements A through D are true. A) Like charges repel each other. B) Unlike charges attract each other. C) Electrostatic forces do play a role in the energy changes during chemical reactions, as they are involved in the breaking and forming of bonds. D) The concept of a force field is used to describe the region around an object where it can exert forces, such as magnetic or electrostatic forces, on other objects.

Question 9

Which of the following is false?

Accepted Answer

In chemical formulas, if there is only one atom of an element, no subscript is used.

Question 10

Which of the following correctly represents electrostatic forces?

Accepted Answer

The answer of Which of the following correctly represents electrostatic...

Question 11

Which of the following changes is/are endothermic for the underlined object?
i.baking a potato
ii.a person being burned by a pan
iii.a wood log burning
iv.a lit light bulb shining
v.a person digesting food

Accepted Answer

The answer of Which of the following changes is/are endothermic...

Question 12

Identify the product(s)that is/are (a)compound(s)in the equation Zn + CoCl₂ → ZnCl₂ + Co.

Accepted Answer

ZnCl₂ is the product formed in the reaction, making it a compound.

Question 13

In which of the following pairs of substances will there be a net attractive electrostatic force?

Accepted Answer

Opposite charges attract each other, so the negatively charged piece of dust and positively charged piece of dust will have a net attractive electrostatic force. The other options all contain two objects with the same charge, so they will have a net repulsive force.

Question 14

What type of pure substance can be decomposed chemically into other pure substances?

Accepted Answer

A compound is made up of two or more elements chemically bonded together. Chemical decomposition involves breaking these bonds and producing new substances, which could be elements or other compounds.

Question 15

Which of the following properties is distillation based upon?

Accepted Answer

Distillation is based on the difference in boiling points of the components in a mixture. The higher boiling point component will remain behind in the boiling flask while the lower boiling point component vaporizes and is collected in the condenser.

Question 16

Which of the following statements is false?

Accepted Answer

The properties of a compound are consistent and do not vary; they are determined by the specific arrangement and types of atoms in the compound.

Question 17

Most methods for separating mixtures into their components depend on which of the following?

Accepted Answer

Most methods for separating mixtures rely on the fact that the different components have different physical properties such as boiling point, solubility, density, and magnetic properties. By exploiting these differences, the components can be separated through techniques such as distillation, chromatography, filtration, and centrifugation. Chemical properties, electromagnetic properties, normalized properties, and spectroscopic properties are also sometimes used for separation, but these are less common and more specialized techniques.

Question 18

Identify the reactants and the products in the equation H₂SO₄ + BaCl₂ → BaSO₄ + 2 HCl.

Accepted Answer

The reactants are H₂SO₄ and BaCl₂, and the products are BaSO₄ and HCl. This is because the reactants combine to form BaSO₄ and HCl is produced as a byproduct of the reaction. Option A and B have the reactants and products switched. Option C has the products switched. Option E does not contain any of the correct elements for the reactants and products.

Question 19

The formula of most elements is the same as the symbol of the element.This indicates that the element is stable as a single __(i)__,the smallest unit particle of the element.Other elements exist as stable,distinct,and independent __(ii)__,which are made up of two or more atoms.

Accepted Answer

The statement mentions that the formula of most elements is the same as the symbol of the element, indicating that the element is stable as a single atom. This suggests that the missing word in (i) could be "atom." Additionally, it mentions that other elements exist as stable, distinct, and independent particles made up of two or more atoms, suggesting that the missing word in (ii) could be "molecules." Therefore, the best choice is (E) atom for (i) and molecules for (ii).

Question 20

Which of the following statements is false?

Accepted Answer

The given chemical equation is actually an endothermic reaction because energy is absorbed instead of being released.

Quiz 2: Matter and Energy

Examine the apparatus shown in the following image. This apparatus would useful in which of the following separations?

Consider the particulate-level illustration: Which is the best classification of this particle?

Which of the following are compounds? i.Carbon dioxide ii.Silicon iii.Sodium carbonate iv.I₂ v.Cr

Which of the following changes is/are exothermic for the underlined object? i.ice melts ii.hot french fries cool iii.a beaker warms as chemicals react within it iv.a hot plate warms a beaker of water v.water evaporates off of skin

Which of the following are elements? i.KOH ii.Ne iii.CO iv.Carbon tetrachloride v.Calcium

Consider the particulate-level illustration: Which is the best classification of this particle-level illustration?

Which of the following particulate-level picture might be associated with the name "silver"?

Which of the following is false?

Which of the following is false?

Which of the following correctly represents electrostatic forces?

Which of the following changes is/are endothermic for the underlined object? i.baking a potato ii.a person being burned by a pan iii.a wood log burning iv.a lit light bulb shining v.a person digesting food

Identify the product(s) that is/are (a) compound(s) in the equation Zn + CoCl₂ → ZnCl₂ + Co.

In which of the following pairs of substances will there be a net attractive electrostatic force?

What type of pure substance can be decomposed chemically into other pure substances?

Which of the following properties is distillation based upon?

Which of the following statements is false?

Most methods for separating mixtures into their components depend on which of the following?

Identify the reactants and the products in the equation H₂SO₄ + BaCl₂ → BaSO₄ + 2 HCl.

The formula of most elements is the same as the symbol of the element.This indicates that the element is stable as a single (i) ,the smallest unit particle of the element.Other elements exist as stable,distinct,and independent (ii) ,which are made up of two or more atoms.

Which of the following statements is false?

Quiz 2: Matter and Energy

Examine the apparatus shown in the following image. This apparatus would useful in which of the following separations?

Consider the particulate-level illustration: Which is the best classification of this particle?

Which of the following are compounds? i.Carbon dioxide ii.Silicon iii.Sodium carbonate iv.I2 v.Cr

Which of the following changes is/are exothermic for the underlined object? i.ice melts ii.hot french fries cool iii.a beaker warms as chemicals react within it iv.a hot plate warms a beaker of water v.water evaporates off of skin

Which of the following are elements? i.KOH ii.Ne iii.CO iv.Carbon tetrachloride v.Calcium

Consider the particulate-level illustration: Which is the best classification of this particle-level illustration?

Which of the following particulate-level picture might be associated with the name "silver"?

Which of the following is false?

Which of the following is false?

Which of the following correctly represents electrostatic forces?

Which of the following changes is/are endothermic for the underlined object? i.baking a potato ii.a person being burned by a pan iii.a wood log burning iv.a lit light bulb shining v.a person digesting food

Identify the product(s) that is/are (a) compound(s) in the equation Zn + CoCl2 → ZnCl2 + Co.

In which of the following pairs of substances will there be a net attractive electrostatic force?

What type of pure substance can be decomposed chemically into other pure substances?

Which of the following properties is distillation based upon?

Which of the following statements is false?

Most methods for separating mixtures into their components depend on which of the following?

Identify the reactants and the products in the equation H2SO4 + BaCl2 → BaSO4 + 2 HCl.

The formula of most elements is the same as the symbol of the element.This indicates that the element is stable as a single __(i) __,the smallest unit particle of the element.Other elements exist as stable,distinct,and independent __(ii) __,which are made up of two or more atoms.

Which of the following statements is false?

Which of the following are compounds? i.Carbon dioxide ii.Silicon iii.Sodium carbonate iv.I₂ v.Cr

Identify the product(s) that is/are (a) compound(s) in the equation Zn + CoCl₂ → ZnCl₂ + Co.

Identify the reactants and the products in the equation H₂SO₄ + BaCl₂ → BaSO₄ + 2 HCl.

The formula of most elements is the same as the symbol of the element.This indicates that the element is stable as a single (i) ,the smallest unit particle of the element.Other elements exist as stable,distinct,and independent (ii) ,which are made up of two or more atoms.