SCIENCE 9-MODULE 7 QUIZ
Quiz by GEMMA F. VALDEZ
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- Q1
What is the symbol of an element Nitrogen?
Ni
O
N
C
15sS9MT-IIj-20 - Q2
Who among the following scientists proposed a scientific law we now call the law of definite proportion?
John Dalton
Joseph Thomson
Antoine Lavoisier
Joseph Proust
20s - Q3
The percentage composition of a compound can be determined from its ________.
Electron Configuration
Valence Electrons
Atomic Number
Chemical Formula
20s - Q4
The molecular formula of Serine is C3H7NO3. How many atoms of hydrogen are present in this organic compound?
7
10
3
13
20s - Q5
The total molecular mass of alumina hydroxide, Al(OH)3, is 78.01 g/mole. How many atoms are present in oxygen?
1
3
2
4
20s - Q6
Chemist need to know the elements present in a compound and in what amount/quantity. Which of the following option tells you the percentage of the mass made up by each element in a compound?
Molecular Mass
Percentage Composition
Avogadro's Number
Mole Concept
20sS9MT-IIj-20 - Q7
Benzoyl peroxide, C14H10O4 is a component of facial creams. What is the atomic mass of an element Carbon?
12.01 g/mol
16.00 g/mol
1.00 g/mol
26.98 g/mol
20s - Q8
The FIRST step in solving a compound's percentage composition is to calculate the mass of each element and the total mass/molecular mass of the compound.
truefalseTrue or False20s - Q9
The molecular formula of vitamin C is C6H8O6. How many atoms are present in Carbon?
Users enter free textType an Answer20s