Helpp Physical science?

1.Solution 1 has a pH of 6.5. When Solution 2 is poured into Solution 1, the new solution has a pH of 5.2. What must be true of Solution 2?

a. It contains no hydroxide ions.

b. It is more acidic than Solution 1.

c. It is a basic solution.

d. It had a pH of 6.5.

2.What do elements in the first two columns of the periodic table have in common?

a. They have two valence electrons.

b. They tend to lose electrons to gain stability.

c. They react strongly with the alkali metals.

d. They do not react with halogens.

3.How many hydrogen (H) atoms are in one molecule of sulfuric acid, H2SO4?
a. 1

b. 2

c. 4

d. 7

4.Which results from water’s formation of hydrogen bonds?

a. Water has surface tension.

b. Hydrogen and oxygen form ionic bonds.

c. Water is a versatile solvent.

d. The specific heat of water is lower than most solids.

5.Which experiment best shows water’s ability to act as a solvent?

a.Raise the temperature of water and record its boiling point.

b. Freeze a flexible vessel of water and watch it expand.

c. Pour an ionic solid into water and see if it dissolves.

d. Place a leaf on top of the surface of water and see if it sinks.

6.How is water different from most liquids?

a. It expands when it freezes.

b. It contains chemical bonds.

c. It has ionic and covalent bonds.

d. It boils when it is heated.

7.A scientist is studying a sample of water and a sample of an unknown liquid. Both samples have the same mass. The scientist had to add more heat to the unknown liquid to raise its temperature by 1°C than she did to the water to raise its temperature by 1°C. Which of these statements about the liquids is most likely true?

a. The unknown liquid has a higher specific heat than water.

b. The unknown liquid has a lower specific heat than water.

c. The unknown liquid has the same specific heat as water, but is made of larger molecules.

d. The unknown liquid has the same specific heat as water, but is made of smaller molecules.

8.A particular atom becomes more energetically stable when it loses a single electron. It is most likely an atom of which of the following elements?

a. magnesium (Mg)

b. cesium (Cs)

c. fluorine (F)

d. boron (B)

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