A change in which no new substances are formed is called a __________ change.
Physical and Chemical Changes

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Science
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8th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
physical
2.
FLASHCARD QUESTION
Front
In a chemical reaction, the substances that react with each other are called the _____ . The new substances that are formed are called the _____ .
Back
reactants; products
3.
FLASHCARD QUESTION
Front
Which of the following statements about all chemical reactions is true?
- Atoms are lost in a chemical reaction.
- Atoms are formed in a chemical reaction.
- A chemical reaction involves the rearrangement of atoms to form products.
- Mass is not conserved in a chemical reaction.
Back
A chemical reaction involves the rearrangement of atoms to form products.
Answer explanation
During a chemical reaction, atoms of the reactants rearrange themselves and combine chemically to form products. No atoms are lost or formed in a chemical reaction. Thus, the mass of the reactants is equal to the mass of the products. Mass is conserved during a chemical reaction.
4.
FLASHCARD QUESTION
Front
Which of the following statements correctly describes combustion?
- Combustion is a chemical change in which a substance is heated in the presence of carbon dioxide.
- Combustion is a physical change in which a substance is heated in the presence of carbon dioxide.
- Combustion is a chemical change in which a substance is heated in the presence of oxygen.
- Combustion is a physical change in which a substance is heated in the presence of oxygen.
Back
Combustion is a chemical change in which a substance is heated in the presence of oxygen.
Answer explanation
Combustion is a chemical change in which a substance is heated in the presence of oxygen.
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