問題一覧
1
Which of the following does not belong to the group?
Sublimation
2
A non-useful chemical change is
releasing of black soot from vehicles
3
Which is the best way to separate a mixture of cork and small rocks?
Use water to make the cork float and the small rocks sink.
4
Which one of the following is not a chemical change?
Using magnet on iron
5
Which of the following statements represents a physical change?
Frozen mango juice melted when left standing at room temperature for 30 minutes.
6
Which of the following practices will an environmentalist believe?
Classifying garbage can identify biodegradable and non-biodegradable waste.
7
A mixture of agua oxinada or hydrogen peroxide and water can be separated by:
Distillation
8
To get salt out of a solution, a student could try
evaporating the water so the salt is left behind
9
If Mary pours the water off after boiling the sweet potatoes, what process has taken place?
Decanting
10
What happens to the force of attraction between particles a solid material melts. The force of attraction
decreases
11
A certain animal tissue has 15% water and 85% fat. How would you separate the mixture?
filter the fat from water
12
What happens to water molecules when liquid water evaporates?
the molecules move slowly away from each other.
13
Ice water was poured into a clean dry glass jar and then tightly covered. After some time liquid droplets formed on the outside wall of the glass jar. What is the correct explanation of this observation?
Water molecules in air gathered or condensed on the cold glass surface.
14
What will happen when you apply more heat to boiling water?
The temperature of water will not change.
15
Why do people disagree on the use synthetic detergents?
Some detergents are non-biodegradable.
16
Which of the following situations exhibits a chemical change?
burning of gasoline
17
The formation of gas bubbles can be observed when baking soda is added to vinegar. This is a sign of
chemical change
18
What is the best way to handle a household cleaner?
read the lable
19
Which label wording is the safest when looking to buy a household product?
Caution
20
The enzymatic browning of apple is due to the oxidation of phenols known as
orthoquinones
21
Which of the following statements is NOT true?
In a solid material, the particles are not moving
22
A body is taken from the earth to the moon. What is expected to happen?
Its mass will remain the same but weight will be different.
23
Why can we smell bagoong when somebody is cooking it?
The particles from bagoong spread in air.
24
Which among the following materials can be best drawn into thin wires and hammered into sheets which can be used for electrical wiring?
copper
25
In which of the following can sound travel the fastest?
solid
26
Three liquids A, B, C were studied in a laboratory. Liquid A was found to float over B and C It was also found that liquid A flows fastest among the three. What can be said about liquid A
Least dense and least viscous
27
Which has a greater density, a lake full of water or a cupful of water?
They have same density
28
Metals have been used for making coins and jewelries. Which of the following characteristics is true of metals?
Metals are malleable and ductile
29
The particles in a solid are arranged as follows:
packed together and can only vibrate
30
Which of the following is TRUE about most gases?
They expand to completely fill their container
31
Which of the following does NOT involve a chemical change in their manufacturing process?
native bag
32
Icebergs (frozen fresh water) float in the ocean. From this it is possible to conclude that
ice is not as dense as sea water
33
Soap, body lotion, and shampoo are examples of consumer products intended for
beautification
34
What is the volume of 80.0 grams of ether if the density of ether is 0.70 g/ml
8.9 x 10 ml
35
Which of the following can cause easily the decomposition of leafy vegetables? I. bacteria and fungi II. temperature III. moisture in the environment
D. I. II, and III
36
Crude oil can be separated into gasoline, diesel, heating oil, etc. by differences in boiling points. The form of matter which would best describe crude oil is:
homogeneous mixture
37
Which of the following statements is FALSE?
Solid water (ice), unlike most substances, is denser than its liquid form (water).
38
Which physical state/property is incorrectly matched
liquids and solids - rigid shape
39
Which of the following observations proves that there is a lot of space between gas molecules?
Large amount of air can be pumped into a car tire.
40
Substances in which phase of matter have the most space between particles?
carbon dioxide gas