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Q 1/50
Score 0
Antoine Lavoisier, the French scientist credited with first stating the law of conservation of matter, heated a mixture of tin and air in a sealed flask to produce tin oxide. What happened to the mass of the sealed flask and contents after the heating?
I. The mass increased II. The mass decreased III. The mass remained the same
40
II
I & III
III
I
Q 2/50
Score 0
All of the following are physical properties of table sugar (sucrose) EXCEPT ____.
35
breaks down into carbon and water vapor when heated
forms solid crystals at room temperature
tastes sweet
appears as crystals white in color
50 questions
Q.
Antoine Lavoisier, the French scientist credited with first stating the law of conservation of matter, heated a mixture of tin and air in a sealed flask to produce tin oxide. What happened to the mass of the sealed flask and contents after the heating?
I. The mass increased II. The mass decreased III. The mass remained the same
1
40 sec
Q.
All of the following are physical properties of table sugar (sucrose) EXCEPT ____.
2
35 sec
Q.
Which is the most suitable separation method can be used to separate a mixture of different colored ink?
3
35 sec
Q.
Which process is a chemical change?
4
35 sec
Q.
What type of chemical formula is illustrated?
5
35 sec
Q.
Which of the following is the correct order of getting salt from the mixture of sand and salt?
6
35 sec
Q.
Which of the following property could NOT be used to distinguish table salt and table sugar?
7
35 sec
Q.
Which of the following describes how decantation is applied BEST?
8
40 sec
Q.
Which group has a member that does not belong?
9
45 sec
Q.
Isotopes of a given element contain
10
35 sec
Q.
Which of the following is the CORRECT formula of copper (II) nitrate?
11
50 sec
Q.
Which of the following is NOT an isotope of Hydrogen?
12
30 sec
Q.
Which of the following formula refers to the symbols of the atoms that make up the molecules?
13
35 sec
Q.
Which of the following is the chemical name of NH₄⁺ ?
14
35 sec
Q.
Which of the following compounds is ionic?
15
40 sec
Q.
Which of the following compounds is covalent?
16
40 sec
Q.
In naming a binary covalent compound, the number of atoms of each element present in the molecule is indicted by
17
35 sec
Q.
It shows only the reduced form of a molecular formula.
18
35 sec
Q.
Which will form an ion with a +2 charge?
19
45 sec
Q.
Which of the following characterizes ionic compounds?
20
35 sec
Q.
Which will form an ion with -1 charge?
21
40 sec
Q.
How many atoms are there in total in a molecule of sulfur trioxide?
22
35 sec
Q.
Which is not an example of an empirical formula?
23
45 sec
Q.
What is the correct formula for barium chlorate?
24
50 sec
Q.
The molecular mass of carbon dioxide (CO₂) is 44.01 amu. What is the molar mass of CO₂?
25
40 sec
Q.
What is the correct formula for calcium dihydrogen phosphate?
26
50 sec
Q.
The formula of the compound formed by magnesium and nitrogen?
27
40 sec
Q.
What is the common name of hydrochloric acid?
28
35 sec
Q.
How can a neutral atom become a cation?
29
35 sec
Q.
What is referred to as an atom or group of atoms that has a net positive or negative charge?
30
30 sec
Q.
Hydrogen peroxide, also known as agua oxinada which is used for cleansing wounds, has a molecular formula of H₂O₂. What is the ratio between hydrogen and oxygen?
31
35 sec
Q.
Ken experienced pain in his stomach after drinking soda. What compound had increased in his stomach?
32
35 sec
Q.
In a science experiment, Pepe noticed a bottle on top of the teacher’s demonstration table. Magnesium chloride is written in the bottle. What is the formula of this compound?
33
50 sec
Q.
What must you know to find the percent composition?
34
35 sec
Q.
Does the percentage mass of an element in a compound change?
35
30 sec
Q.
To calculate the percent composition of a compound from its formula, what is the first step you must do?
36
40 sec
Q.
Which of the following is the classical name for this compound Fe₂ (SO₄)₃ ?
37
40 sec
Q.
Which formula shows the actual number of and kinds of atom in one molecule of a compound?
38
35 sec
Q.
What is the important variable to be consider in calculating the molecular formula of a compound?
39
35 sec
Q.
What scientific law is explained using balanced chemical equations?
40
30 sec
Q.
What kind/s of data are needed to determine the molecular formula of a compound? I. percentage composition II. molar mass III. volume of compound IV. empirical formula
41
45 sec
Q.
Which of the following symbols means a substance is in water solution?
42
30 sec
Q.
Which of the following choices gives the correct coefficients of the chemical equation, __Al + __O₂ → __Al₂O₃ respectively?
43
180 sec
Q.
When oxygen is available, sulfur dioxide is produced from the burning of sulfur. Which of the following word equations best represents this reaction?
44
45 sec
Q.
Why can’t you change the formula in order to balance a reaction?
45
45 sec
Q.
Which equation is correctly balanced?
46
240 sec
Q.
For nos 47-48. A compound contains 46.7% N and 53.3% O. If the molecular mass of the compound is 60.0 g/mol, what is the a.) molecular formula and b.) empirical formula?
47
150 sec
Q.
For nos 47-48. A compound contains 46.7% N and 53.3% O. If the molecular mass of the compound is 60.0 g/mol, what is the a.) molecular formula and b.) empirical formula?
48
150 sec
Q.
For nos 49-50. Monosodium glutamate (MSG), a flavor enhancer in certain foods containing 35.51% carbon (atomic mass = 12.01 g/mol), 4.77% hydrogen (atomic mass = 1.01 g/mol), 37.85% oxygen (atomic mass = 16.00 g/mol), 8.29% nitrogen (atomic mass =14.01 g/mol) and 13.60% sodium (atomic mass = 22.99 g/mol). Calculate the chemical empirical formula of MSG.
49
150 sec
Q.
For nos 49-50. Monosodium glutamate (MSG), a flavor enhancer in certain foods containing 35.51% carbon (atomic mass = 12.01 g/mol), 4.77% hydrogen (atomic mass = 1.01 g/mol), 37.85% oxygen (atomic mass = 16.00 g/mol), 8.29% nitrogen (atomic mass =14.01 g/mol) and 13.60% sodium (atomic mass = 22.99 g/mol). Calculate the chemical empirical formula of MSG.
