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Question 1 of 10
1. Question
What is the primary reason why toothpaste helps control tooth decay?
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Question 2 of 10
2. Question
The type of chemical reaction which occurs when only one product is formed from two or more reactants, is called _____.
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Question 3 of 10
3. Question
Which of the following particles are involved in the formation of compounds?
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Question 4 of 10
4. Question
The chemical reaction that releases heat energy during the process is called _____.
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Question 5 of 10
5. Question
Roger has a 2-meter roll of aluminum foil labelled 100% made of aluminum. He takes a thumb-size piece of that aluminum foil. Which of the following statements is true about the piece of aluminum foil that Roger took compared with the rest of aluminum in the roll?
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Question 6 of 10
6. Question
Which of the following is an example of a chemical change?
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Question 7 of 10
7. Question
Paint applied to an iron surface prevents the iron from rusting, because _____.
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Question 8 of 10
8. Question
Which two are occur at the same temperature?
I.Freezing
II.Condensation
III. Melting
IV.Sublimation
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Question 9 of 10
9. Question
The radioisotope which is now used un cancer radiation treatment is _____.
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Question 10 of 10
10. Question
Which radioactive radiation coming from external source is most dangerous to human body?
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