問題一覧
1
Why do atoms form bond?
Atoms form bond because they need to attain the valence electron of a noble gas.
2
Which of the following statements is INCORRECT?
The covalent bond is formed by the transfer of electrons.
3
What element is most likely to donate an electron to be a cation?
Na
4
Which of the following would be characterized as a molecular compound? I. CO II. Zn(OH)2 III. Fe
I only
5
Which of the following is NOT a property of ionic compounds?
Has low boiling point
6
Which combination of atoms is most likely to produce a compound with ionic bonds?
Al and F
7
Which of the following bonds has the greatest electrical and thermal conductivity?
Metallic bond
8
Which of the following pairs of elements and valence electrons is INCORRECT?
Sn-4
9
What kind of bonding occurs in the water molecule?
Polar covalent
10
Which combination describes the flame color of the compound when heated?
Sodium Chloride - Yellow orange
11
Which element has the greatest number of electrons?
20C-1s²2s²2p63s²3p64s²
12
For a neutral atom with the electron configuration of 1s²2s²2p63s². Which statement is INCORRECT?
The atom is in a ground state.
13
Which element has the proper arrangement of electron configuration?
1s²2s²2p³
14
The easier an atom loses its electron, the lesser its _______
lonization energy
15
Particles with charges make up atoms. In an atom, which has negatively charge particle?
Electron
16
Carbon shows covalency of ______
4
17
Given the following electronegativity values Which pair of atoms will most likely to form covalent bond?
Y and Z
18
How does ionic bond take place?
A metallic element like sodium is attracted to a non-metallic element like fluorine.
19
What will most likely happened 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.
II and III
20
Which of the following is an essential constituent of hemoglobin and stored in body tissues to supple body needs?
Iron
21
Which of the following metals is usually used as construction material?
Iron
22
Andrew cut his finger accidentally when he was slicing the apple. He has to apply something on his wounds so that it can not get infected. Which compound is the most appropriate to use?
Hydrogen peroxide
23
Which are true about organic compounds? I. Organic compounds contain calcium II. Organic compounds contain carbon III. Organic compounds can be produced by living things IV. Organic compounds can be produced artificially
II and III only
24
Which of the following is the correct pairing of carbon compounds to it's uses? 1. Sting insect bites 2. Fragrance 3. Best for solvent extraction a. formic acid b. Ester c. Ether
1-a;2-b;3-c
25
The open chain aliphatic hydrocarbon with molecular formula of C9H16 is ______
An alkyne
26
Which statement best explains why the element carbon forms so many compounds?
Carbon readily forms covalent bonds with other carbon atoms.
27
Which compound is correctly named? I. CO - Carbon monoxide II. CH3 - Methane III. H3P - Tri Hydrogen phosphate
I and II
28
How many hydrogen atoms can still form bond with carbon if oxygen is already bonded with carbon?
2
29
29. Why do carbon atoms form four (4) bonds?
Because it has four valence electrons
30
Which represents the bonding capacity of carbon?
A.
31
The gas used in the welding and cutting metal is ______
Ethyne/Acetylene
32
Which type of compound is responsible in many of the pleasant smells of fruits and flowers?
Esters
33
Which are TRUE about the use of 70% of ethyl alcohol? I. Solvent II. Lubricant III. Disinfectant IV. Fertilizer
I and III only
34
Aldehydes and ketones are classes if organic compounds used in preserving dead bodies, add fragrance in making perfumes and as a nail polish remover. Which of the following organic compounds are correctly paired with their common and systematic names?
Formalin: methanal
35
Miss Reyes advised her students to preserve a fish for their project. What compound should she use to preserve the fish?
Formaldehyde
36
Graphite differs from diamond because graphite is _______
Slippery to touch and good conductor of electricity.
37
Which of the following is true about mole?
It is equivalent to 6.022x1023 particles.
38
Which among the following is the heaviest?
100 amu of Uranium
39
Which of the following is TRUE of different substances having an equal number of moles?
They have equal number of particles.
40
Calculate the number of molecules in 6.2 g of formaldehyde, CH₂O (C-12.0 amu: H-1.0 amu: O-16.0 amu)
3.7x1024
41
If one dozen is 12 pieces of eggs, how many atoms of oxygen are there in one mole of oxygen?
6.02x10²³ atoms
42
Methane is a principal component of natural gas. How many moles of CH, are present in 6.07g of CH?
0.378 mole
43
What quantity determines the percentage composition of a compound in a chemical formula?
Mole
44
How do you calculate the percentage composition by mass of an element in a compound?
By dividing the mass of the element in one mole of the compound by the mass of one mole of the compound and multiplying the quotient by 100%.
45
Water is an organic chemical substance that is vital for all known forms of life. Find the percentage composition of Hydrogen in water.
11.21%
46
Potassium permanganate is extensively used for medical purposes including as an antiseptic and fungicide. What is the percentage composition of potassium in a compound KMnO4 (Mn=54.9 amu; O-39.1amu)
24.75%
47
What will be the molecular weight of a chemical consisting of 2 moles of H₂ SO, 3 moles of SO₂ and 1 mole of NaOH?
428 g/mole
48
The term used to describe the percent by mass of each element in a compound is called percentage composition. Calculate the percentage by mass of oxygen in a compound Ca(NO3)
58.54%
49
How many moles of oxygen will be released if 5.0g of hydrogen peroxide (H₂ 0₂) completely react with the catalase in the blood?
0.13 mole 02