問題一覧
1
Why do atoms react with one another to form chemical bonds?
A. To attain stability
2
Which among the following shows that an atom is stable?
D.Having 8 valence electrons
3
What kind of elements has the greatest to attract electrons?
B. Non - Metals
4
A chemical bond formed when two atoms share electrons is called
A. Covalent Bonding
5
what kind of bond will result when two identical non-metallic atoms combine?
D. Non-pollar covalent bond
6
What will most likely to happen to a non-metallic atom after ionic bonding? I. It forms a cation II. It forms an anion III.It becomes stable IV. It becomes unstable
B. II and III
7
Metals tend to _____ electrons to become ____ ions.
B. lose, postive
8
Anions tend to be ____ and cations tend to be _____.
D. Nonmetals, metals
9
The ions having negative charges are _____.
C. anions
10
A positive ion, called a ____ is produced when one or more electrons are lost from a neutral atom.
B. cation
11
Which of the following are the properties of covalent compounds?
D
12
What is the nature of the substances describe in the table?
A
13
Which of the following statements BEST explain why covalent compounds do not conduct electricity when dissolved in water?
C. Covalent compounds dissolve into molecules
14
Which of the following substances does NOT conduct electricity? I. Salt solution II. Sugar Solution III. Salt Granules IV. Monosodium Glutamate Solution
C. II and III only
15
Maria is working as a student assistant in their school Chemistry laboratory. Which of the following shows a direct application of knowledge about the properties of compounds as a student assistant in the Chemistry laboratory?
C. I and II only
16
Metals can be flattened or can be formed into sheets when being hammered. Which of the following support the statement.
B. Metal atoms have the ability to slide over one another without breaking the metallic bond.
17
The capability of a metal to be drawn into wire is known as _____.
A. Ductility
18
It is a measure of a metal's ability to withstand scratching, wear, and abrasion, indention by harder bodies.
B.hardness
19
Aluminum is used for making cooking utensils. Which of the following properties of aluminum are responsible for the same? I. Good thermal conductivity II. Good electrical conductivity III. Ductility IV. High melting point
D. I and IV
20
Which of the following types of bonds will have the highest electrical and thermal conductivity?
A. Metallic Bond
21
What unusual properties do carbon atoms have?
A. They can bond to each other to form chains.
22
How many bonds can a Hydrogen hold?
A. 1
23
The following is the importance of knowing the properties of common liquid materials, EXCEPT
A. Organic compounds are all expensive and rare in our environment
24
Which hydrocarbon compound has a triple bond in the molecule?
D. Propyne
25
What is common between Carbonyl compounds like acetone and formaldehyde?
B. It contains the carbonyl functional group.
26
Why are carbon atoms able to form many organic compounds?
B. Carbon atoms can form many types of bonds with other carbon
27
What is the structural formula of an Alcohols
A
28
What is the structural formula of an Formaldehyde
C
29
What is the structural formula of an Acetone
B
30
What is the structural formula of an Alkenes
D
31
Calcium carbonate (CaCO³ Molar Mass = 100.09 g/mole) is an antacid used to neutralize extra acid in the stomach. Lorie is prescribed by the doctor to take 250mg - tablet of CaCO³ will Lorie consume for 3 days?
B. 0.0225 moles
32
Methane (CH⁴ molar mass = 16.04 g/mole) is one of the greenhouse gases. If 32.08 g of CH⁴ is released in the atmosphere, how many molecules of CH4 are added in the atmosphere?
A. 1.20 x 10²⁴
33
What do you expect to observe in a "Mole Exhibit of Different Substances?
C. showcase of one mole of different elements having different masses
34
Who among the following students describe the result of the activity on counting by weighing correctly?
C. Tom
35
People usually use hydrogen peroxide (H²O² molar mass = 34.02 g/mole) to clean their wounds. If Cheska used 1.0 g of H²O² to clean her wound, how many moles of H2O2 did she use?
C. 0.029
36
How many particles are there in 1 mole of any kind of substance?
C. 6.02 x 10²³
37
Why is the mole concept important?
D. All of the above
38
The label of the dark chocolate indicates that its mass is 150g and it is 70% cacao, if you consume the whole chocolate bar, how much cacao did you eat?
A. 105 g
39
Ammonium nitrate (NH⁴NO³ Molar Mass = 80.06g/mole) is a substance used to produce dinitrogen monoxide (N²O), a dental anesthetic. Determine the mass percent of N in ammonium nitrate?
A. 35.00%
40
The presence of SO² in the atmosphere cause acid rain. What percentage of sulfur is present in SO² (molar mass = 64.07 g/mole)?
B. 49.95%
41
What percentage of H (hydrogen) is Present in water (H²O)
B. 11%
42
.
C
43
.
B
44
.
A
45
.
A
46
.
B