ONE. True or False Questions (2 points per grid)

1.( ) Winter is coming, Xiao Ming feels that his hands are very cold, in addition to using an electric heater, he can also rub his hands against each other to generate heat and raise the temperature of his hands.

Correct answer: O

2.( ) Xiaohua found a very old dictionary in his grandfather's bookcase, and the dictionary paper turned yellow. This kind of material change phenomenon of "paper turning yellow" is the same as "discoloration of a cut apple", which is a relatively rapid change.

Correct answer: X (Analysis: Yellowing of paper is a slower change; Apple discoloration is a faster change. )

3.( ) In the hot summer, Xiaomei bought a popsicle, but she forgot to eat it and put it on the table. After a period of time, the popsicles become soft and turn into water due to heat, a phenomenon called "melting" when the solid state turns into a liquid state.

Correct answer: O

4.( ) Mom hung the washed wet clothes on the balcony, and the clothes dried after being exposed to the sun and wind. This process of liquid water turning into gaseous water vapor is called "condensation".

Correct answer: X (Analysis: Liquid water turning into gaseous water vapor is called "evaporation".)

5.( ) During dinner, Dad opened the lid of the pot filled with hot soup, and Xiaoqiang found many small water droplets on the inside of the lid. This is because the water vapor from the hot soup meets the cold lid and turns into liquid water.

Correct answer: O

6.( ) Ash takes a cube of ice out of the square ice box and puts it into a round glass. Because ice is solid, its shape changes with the round glass.

Correct answer: X (Analysis: Solid ice has a fixed shape and does not change with the container; Liquid water will. )

7.( ) If you want to dry your freshly washed hair quickly, in addition to wiping it with a towel, using a hair dryer to blow your hair can increase the temperature and increase the wind blowing, thereby speeding up the evaporation of water.

Correct answer: O

8.( ) During the Mid-Autumn Festival, the raw meat is cooked, and the charcoal burns into ashes. These substances change their shape after being heated, and as long as they are placed in the refrigerator to cool, they can return to their original appearance.

Correct answer: X (Analysis: Meat roasting and charcoal burning have changed in nature and cannot be restored to their original appearance.)

9.( ) Put the bicycle outdoors in the rain, and after a while, the bicycle chain rusted. This phenomenon of metal rust is a slower change in matter.

Correct answer: O

10.( ) When Grandma was boiling water in the kitchen, a lot of white smoke spewed out from the teapot spout. These white smokes are gaseous water vapor that water turns into invisible under natural conditions.