問題一覧
1
Which of the following types of bonds will have the highest electrical and thermal conductivity?
A. Metallic Bond
2
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
3
What is the structural formula of an Alcohols
A
4
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
5
What unusual properties do carbon atoms have?
A. They can bond to each other to form chains.
6
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
7
Which of the following statements BEST explain why covalent compounds do not conduct electricity when dissolved in water?
C. Covalent compounds dissolve into molecules
8
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.
9
Which of the following are the properties of covalent compounds?
D
10
What kind of elements has the greatest to attract electrons?
B. Non - Metals
11
.
A
12
A positive ion, called a ____ is produced when one or more electrons are lost from a neutral atom.
B. cation
13
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
14
What percentage of H (hydrogen) is Present in water (H²O)
B. 11%
15
.
A
16
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
17
.
B
18
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%
19
What is common between Carbonyl compounds like acetone and formaldehyde?
B. It contains the carbonyl functional group.
20
Why are carbon atoms able to form many organic compounds?
B. Carbon atoms can form many types of bonds with other carbon
21
The ions having negative charges are _____.
C. anions
22
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
23
The capability of a metal to be drawn into wire is known as _____.
A. Ductility
24
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%
25
What is the structural formula of an Alkenes
D
26
Which among the following shows that an atom is stable?
D.Having 8 valence electrons
27
Why do atoms react with one another to form chemical bonds?
A. To attain stability
28
Anions tend to be ____ and cations tend to be _____.
D. Nonmetals, metals
29
It is a measure of a metal's ability to withstand scratching, wear, and abrasion, indention by harder bodies.
B.hardness
30
Who among the following students describe the result of the activity on counting by weighing correctly?
C. Tom
31
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
32
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
33
.
B
34
Why is the mole concept important?
D. All of the above
35
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
36
What is the structural formula of an Acetone
B
37
A chemical bond formed when two atoms share electrons is called
A. Covalent Bonding
38
what kind of bond will result when two identical non-metallic atoms combine?
D. Non-pollar covalent bond
39
How many bonds can a Hydrogen hold?
A. 1
40
What is the structural formula of an Formaldehyde
C
41
Which hydrocarbon compound has a triple bond in the molecule?
D. Propyne
42
What do you expect to observe in a "Mole Exhibit of Different Substances?
C. showcase of one mole of different elements having different masses
43
How many particles are there in 1 mole of any kind of substance?
C. 6.02 x 10²³
44
Metals tend to _____ electrons to become ____ ions.
B. lose, postive
45
.
C
46
What is the nature of the substances describe in the table?
A