4. When the liquid starts bubbling up after being heated, the pressure of the atmosphere becomes equal to
the pressure of the vapor from the liquid. When this happens, the liquid is described as
a. boiling
b. evaporating
c. heating
d. melting
5. The pressure exerted by a body of water against the air is called pressure.
b. atmosphere
d. vapor
6. Water boils at 100°C at 1 atm. If 116 g sodium chloride (table salt) is added, its boiling temperature will be
a. air
c. low
a. 98°C
b. 100°C
c. 101°C
d. any of these
7. Which among the choices below will boil at a constant temperature?
a. Salt solution b. Distilled water
c. Calamansi Juice
d. Detergent solution
8. Which among the choices below will boil at a changing temperature?
a. Mercury
b. Seawater
c. Pure ethanol
d. Distilled water
9. Which of the following is an example of mixture?
A. dew
B. brown sugar
C. iodine crystals
D. rubbing alcohol
10. Melting is the process where solid turns into liquid.
a. true
b. false
c. maybe
d. both
11. During melting, a mixture melts completely at a short period of time.
a. true
b. false
c. maybe
d. both
12. Substance melts at one specific temperature.
b. false
a. true
d. both
c. maybe
13. Which of the following refers to the temperature at which a substance changes from solid to liquid?
b. freezing point
a. boiling point
d. evaporation point
c. melting point
ure?
paki ansser po ng maayos​