Question

4. Which of the following is the best way of differentiating elements and compounds?
A. Elements and compounds can be separated chemically.
B. Elements are physically combined while compounds are chemically combined.
C. Elements are simple substances while compounds are complex substances.
D. Elements are made of only one kind of atom while compounds are made of two or more kinds of atoms.

5. Which of the following is NOT a pure substance?
A. Aluminum
B. Copper
C. Shampoo
D. Table sugar

6. Which of the following substances does NOT belong to the group?
A. Baking soda
C. Magnesium
B. Carbohydrates
D. Monosodium glutamate

7. Which of the following atomic symbols for bromine is written correctly?
A.br
B. BR
C. Br
D. Bh

8. Which of the following substances is classified as a compound?
A. Hydrogen gas
B. Ozone
C. Sulfur
D. Water

9. In water molecules (H2O), what is the proper proportion in terms of the atom present in the molecule?
A. 2 Hydrogen and 1 Oxygen
C. 1 Hydrogen and 2 Oxygen
B. 2 Hydrogen and 2 Oxygen
D. 1 Hydrogen and 1 Oxygen

10. In agua oxigenada (H202), what is the proper proportion in terms of the atom present in the molecule?
A. 2H:0
B. H:20
C. 2H:20
D. H:0

11.If an acid is combined with a base of equal strength, the result will most likely be
A. neutral solution.
B.impossible to tell without testing the.
C. a stronger acid.
D. a stronger base

12. Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue. The substance in the beaker A. is a base
B. is an acid
D. has no pH
C. has a neutral pH

13. Which of the following is a base?
A.orange juice of a substance
B. vinegar
C. water
D. dishwashing detergent.

14. Litmus paper can be used to determine the ______ of a substance.
A.relative volume
B. relative pH
C. temperature
D.chemical formula

15. Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
A.strongly acidic
B.strongly basic
C.slightly acidic
D.slightly basic ​

Answer 1

Answer:

4.d

5.c

6.a

7.c

8.d

9.a

10.c

11.a

12.c

13.d

14.b

15.d