
NC Check in :Chemistry
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include boiling water and melting wax.
2.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a change that results in the formation of new chemical substances. Examples include rusting iron and baking a cake.
3.
FLASHCARD QUESTION
Front
List the elements in order from least reactive to most reactive: Sr, K, Cl, P.
Back
Cl, P, Sr, K
4.
FLASHCARD QUESTION
Front
What are isotopes?
Back
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
5.
FLASHCARD QUESTION
Front
Which element is a poor conductor of heat: Ne, Mg, Ca, Na?
Back
Ne (Neon) is a poor conductor of heat.
6.
FLASHCARD QUESTION
Front
What does a balanced chemical equation demonstrate about the Law of Conservation of Mass?
Back
A balanced chemical equation shows that during a chemical reaction, the total amount of matter stays the same.
7.
FLASHCARD QUESTION
Front
What is the definition of reactivity in chemistry?
Back
Reactivity refers to the tendency of a substance to undergo a chemical reaction, either by itself or with other materials.
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