Chemistry: Atoms and Bonding Quiz

Play an AI-generated podcast conversation about this lesson

How many total atoms are represented in the formula 3CaCl₂?

6
12
15
9 (correct)

What is the total number of sulfur atoms in 4K₂SO₄?

4 (correct)
12
8
2

When counting atoms in 5Fe₂O₃, what is the total number of oxygen atoms?

30
10
5
15 (correct)

How many hydrogen atoms are there in the expression 3H₂SO₄?

6 (D) Signup and view all the answers

In the molecule 2C₂H₆, how many total carbon atoms are present?

6 (A) Signup and view all the answers

What is the main characteristic of covalent bonds as described?

They occur between nonmetals and involve sharing valence electrons. (B) Signup and view all the answers

Which of the following is true about the valence electrons indicated by an element's group number?

Elements in the same group have the same number of valence electrons. (D) Signup and view all the answers

What happens to the metal atom in an ionic bond?

It donates electrons, becoming a positively charged ion. (C) Signup and view all the answers

Which pair of elements would most likely form an ionic bond?

Sodium and Chlorine (A) Signup and view all the answers

What characteristic distinguishes ionic compounds from covalent compounds?

Covalent compounds generally have higher melting points. (B) Signup and view all the answers

Which of the following statements accurately describes groups of elements and their valence electrons?

Atoms in Group 15 have 5 valence electrons. (B), Atoms in Group 13 have 3 valence electrons. (D) Signup and view all the answers

What is the primary reason that noble gases do not typically form bonds?

They possess 8 valence electrons in their outer shell. (B) Signup and view all the answers

How do metals generally behave in terms of electron transfer in bonding?

They lose electrons to become positively charged ions. (D) Signup and view all the answers

What distinguishes transition metals from main group elements regarding their valence electron configurations?

Their valence electron configurations are not usually discussed in lower education levels. (D) Signup and view all the answers

What defines an ion in the context of chemical bonding?

An ion is an atom with a net electrical charge due to the loss or gain of electrons. (B) Signup and view all the answers

What is the purpose of adding coefficients in a chemical equation?

To balance the number of atoms of each element on both sides. (B) Signup and view all the answers

Which of the following is a correctly balanced equation?

N₂ + 2H₂ → 2NH₃ (B) Signup and view all the answers

Which step is NOT included in the process of balancing a chemical equation?

Change the subscripts as necessary. (A) Signup and view all the answers

In the example reaction N₂ + 3H₂ → 2NH₃, how many hydrogen atoms are present in the products?

6 (B) Signup and view all the answers

What is the first step in balancing a chemical equation?

Count the atoms of each element present. (A) Signup and view all the answers

What is a crucial step in balancing a chemical equation?

Adding coefficients to balance the elements (D) Signup and view all the answers

In the equation N₂ + H₂ → NH₃, which coefficients are necessary to balance it correctly?

1, 3, 2 (D) Signup and view all the answers

How do you check your work after balancing a chemical equation?

Ensure the total mass of reactants equals the total mass of products (C) Signup and view all the answers

Which of the following equations is balanced correctly?

C + 2H₂ → CH₄ (C) Signup and view all the answers

What mistake should be avoided when balancing chemical equations?

Increasing the number of molecules without justification (B) Signup and view all the answers

How many total atoms are present in the formula 3 C₆H₁₂O₆?

36 atoms (A) Signup and view all the answers

In the chemical equation 2 H₂ + O₂ → 2 H₂O, how many total oxygen atoms are involved in the reaction?

2 atoms (A) Signup and view all the answers

What is the total number of atoms in the formula 3 CaCl₂?

9 atoms (A) Signup and view all the answers

In the formula 4 K₂SO₄, how many sulfur atoms are there in total?

4 atoms (D) Signup and view all the answers

If the formula 5 Fe₂O₃ is given, how many total iron atoms are there?

10 atoms (D) Signup and view all the answers

Chemical Bonding

Atoms joining together to create new substances, like when hydrogen and oxygen combine to form water.

Valence Electrons

Electrons in the outermost shell of an atom, which are involved in bonding.

Groups 1 & 2 Valence Electrons

Elements in groups 1 and 2 on the periodic table have the same number of valence electrons as their group number. For example, lithium (Group 1) has 1 valence electron.