Ionic, covalent, hydrogen
Before you read
Test yourself first: 5 questions
Question 1 of 5
A chemical bond formed by sharing electrons between atoms is a(n):
Answer: B. Covalent bonds share electrons (typical of nonmetals). Ionic bonds transfer electrons between a metal and nonmetal.
Question 2 of 5
The outer electrons of an atom that participate in bonding are called:
Answer: B. Valence (outer-shell) electrons determine how an atom bonds with others.
Question 3 of 5
A substance made of two or more elements chemically combined in a fixed ratio is a(n):
Answer: B. A compound is elements chemically bonded in a set ratio (e.g., H₂O). A mixture is not chemically combined.
Question 4 of 5
Which of these is a chemical change?
Answer: B. Digestion chemically breaks food into new substances — a chemical change.
Question 5 of 5
Which of the following is a chemical property?
Answer: B. Flammability describes how a substance reacts (burns) — a chemical property. The others are physical.
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