問題一覧
1
Which represents the bonding capacity of carbon?
A.
2
The easier an atom loses its electron, the lesser its _______
lonization energy
3
Which combination describes the flame color of the compound when heated?
Sodium Chloride - Yellow orange
4
Which of the following is NOT a property of ionic compounds?
Has low boiling point
5
For a neutral atom with the electron configuration of 1s²2s²2p63s². Which statement is INCORRECT?
The atom is in a ground state.
6
Which statement best explains why the element carbon forms so many compounds?
Carbon readily forms covalent bonds with other carbon atoms.
7
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
8
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
9
Which are TRUE about the use of 70% of ethyl alcohol? I. Solvent II. Lubricant III. Disinfectant IV. Fertilizer
I and III only
10
Miss Reyes advised her students to preserve a fish for their project. What compound should she use to preserve the fish?
Formaldehyde
11
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
12
Particles with charges make up atoms. In an atom, which has negatively charge particle?
Electron
13
Which of the following metals is usually used as construction material?
Iron
14
29. Why do carbon atoms form four (4) bonds?
Because it has four valence electrons
15
Which element has the greatest number of electrons?
20C-1s²2s²2p63s²3p64s²
16
Which type of compound is responsible in many of the pleasant smells of fruits and flowers?
Esters
17
Which element has the proper arrangement of electron configuration?
1s²2s²2p³
18
Which of the following bonds has the greatest electrical and thermal conductivity?
Metallic bond
19
Which of the following is an essential constituent of hemoglobin and stored in body tissues to supple body needs?
Iron
20
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
21
Which of the following is TRUE of different substances having an equal number of moles?
They have equal number of particles.
22
What kind of bonding occurs in the water molecule?
Polar covalent
23
Given the following electronegativity values Which pair of atoms will most likely to form covalent bond?
Y and Z
24
Which of the following would be characterized as a molecular compound? I. CO II. Zn(OH)2 III. Fe
I only
25
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
26
Which of the following is true about mole?
It is equivalent to 6.022x1023 particles.
27
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%.
28
Graphite differs from diamond because graphite is _______
Slippery to touch and good conductor of electricity.
29
Which of the following statements is INCORRECT?
The covalent bond is formed by the transfer of electrons.
30
Which combination of atoms is most likely to produce a compound with ionic bonds?
Al and F
31
Which of the following pairs of elements and valence electrons is INCORRECT?
Sn-4
32
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
33
Carbon shows covalency of ______
4
34
What element is most likely to donate an electron to be a cation?
Na
35
How does ionic bond take place?
A metallic element like sodium is attracted to a non-metallic element like fluorine.
36
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%
37
How many hydrogen atoms can still form bond with carbon if oxygen is already bonded with carbon?
2
38
Which compound is correctly named? I. CO - Carbon monoxide II. CH3 - Methane III. H3P - Tri Hydrogen phosphate
I and II
39
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
40
What quantity determines the percentage composition of a compound in a chemical formula?
Mole
41
The open chain aliphatic hydrocarbon with molecular formula of C9H16 is ______
An alkyne
42
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
43
If one dozen is 12 pieces of eggs, how many atoms of oxygen are there in one mole of oxygen?
6.02x10²³ atoms
44
Which among the following is the heaviest?
100 amu of Uranium
45
Methane is a principal component of natural gas. How many moles of CH, are present in 6.07g of CH?
0.378 mole
46
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%
47
The gas used in the welding and cutting metal is ______
Ethyne/Acetylene
48
Why do atoms form bond?
Atoms form bond because they need to attain the valence electron of a noble gas.
49
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%