MULTIPLE CHOICE·Choose the one alternative that best completes the statement or

Question

MULTIPLE CHOICE·Choose the one alternative that best completes the statement or answers the question. 1. A detailed explanation of natural extensively tested is called a phenomena that is generally accepted and has been A) theory. B) hypothesis. C) law. D) fact. E) postulate. 2. Which statement about a hypothesis is TRUE? A) It is a tentative interpretation or explanation B) It has the potential to be proven wrong. C) It can be tested by experiments. D) It is part of the scientific method. E) All of the above statements are true 3. The state of matter for an object that has a variable shape and definite volume is a A) solid B) liquid C) gas D) pure substance E) plasma 4. Which of the following is a chemical change? boiling of water melting wax broiling a steak on a grill condensing water vapor into rainfall carving a piece of wood A) D) E) B) C) 5. Which one of the following represents a physical change? A) B) bleach turns hair yellow C) D) E) water, when heated to 100°C, forms steam sugar, when heated, becomes brown milk turns sour apples, when exposed to air, turn brown 6. Which of the following cannot be separated into a simpler substance by chemical means? A) element B) emulsion D) homogeneous mixture E) heterogeneous mixture C) compound 7. Which of the following does not have a uniform composition throughout? A) element B) compound C) homogeneous mixture D) heterogeneous mixture E) solvent

Explanation / Answer

A detailed explanation of natural phenomena that is generally accepted and has been extensively tested
is called a theory
A. theory
2. It is a tentative interpretation or explanation
A) It is a tentative interpretation or explanation
3. Definate volume and definate shape for solid
A) solid
4. broiling a steak on a grill is chemical change
C) broiling a steak on a grill
5.on heating water converted to steam is called boiling point.
it is physical change
A. water when heated to 100C^0 forms steam
6. A. element
7. D. heterogeneous mixture

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