Chemistry Concepts and Applications Quiz

What is the isotope notation for an element with 6 protons, 6 neutrons, and 6 electrons?

Answer explanation

The element with 6 protons is carbon (C). The mass number is the sum of protons and neutrons, which is 12. Thus, the correct isotope notation is \(^{12}_{6}\text{C}\).

Which of the following compounds is an example of an ionic bond?

Answer explanation

The compound \(\text{NaCl}\) is an example of an ionic bond, formed by the transfer of electrons from sodium to chlorine, resulting in oppositely charged ions. The other compounds listed are covalent bonds.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-3

Answer explanation

The empirical formula is the simplest whole-number ratio of atoms in a compound. For glucose (C6H12O6), dividing each subscript by 6 gives CH2O, which is the correct empirical formula.

Answer explanation

To balance the equation, count the atoms: C: 3, H: 8, O: 10 needed. The correct coefficients are 1 for C3H8, 5 for O2, 3 for CO2, and 4 for H2O, giving the balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O.

Tags

NGSS.HS-PS1-7

• Synthesis

• Decomposition

• Single replacement

• Double replacement

Answer explanation

The reaction AB + CD → AD + CB involves the exchange of components between two compounds, which is characteristic of a double replacement reaction. In this case, A and C switch places with B and D.

• Yes, because zinc is more reactive than copper.

• No, because copper is more reactive than zinc.

• Yes, because copper is more reactive than zinc.

• No, because zinc is less reactive than copper.

Answer explanation

The reaction occurs because zinc (Zn) is more reactive than copper (Cu). According to the activity series, a more reactive metal can displace a less reactive metal from its compound, thus confirming the reaction.

• 54 grams

• 36 grams

• 18 grams

• 72 grams

Answer explanation

To convert moles to grams, multiply the number of moles by the molar mass. Here, 3 moles of H₂O x 18 g/mol = 54 grams. Thus, the correct answer is 54 grams.

What is the charge on an aluminum ion?

Answer explanation

Aluminum typically forms a +3 charge when it loses three electrons to achieve a stable electron configuration, making +3 the correct charge for an aluminum ion.

Tags

NGSS.HS-PS1-1

Which of the following is a property of acids?

• Bitter taste

• Slippery feel

• Turns blue litmus paper red

• Turns red litmus paper blue

Answer explanation

Acids are characterized by their ability to turn blue litmus paper red, indicating their acidic nature. The other options describe properties of bases or are incorrect.

Which element has a higher electronegativity, fluorine or chlorine, and why?

• Fluorine, because it is smaller in size.

• Chlorine, because it has more protons.

• Fluorine, because it has more protons.

• Chlorine, because it is larger in size.

Answer explanation

Fluorine has a higher electronegativity than chlorine because it is smaller in size. The smaller atomic radius allows fluorine to attract electrons more effectively due to its stronger effective nuclear charge.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2