اختبار شابتر 2
Quiz by Dr.mariam 0547389123
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- Q1
which of these element does not exist as a diatomic molecule?
F
H
Ne
I
300s - Q2
FeO molecules is considered as a ….
polyatomic molecule
diatomic molecules
mixture
element
300s - Q3
what’s the pure sub.Made of two or more elements that are chemically combined
Element
Mixture
Compound
Solution
300s - Q4
May be separated into pure substances byphysical methods.
a covalent compound
an Ionic compound
a Mixture
an Element
300s - Q5
Fruit salad is what kind of substance?
Solution
Suspension
Homogeneous mixture
Heterogeneous mixture
300s - Q6
Asubstance that cannot be chemically broken down into simpler substance isconsidered?
a compound
a homogenous mixture
an element
heterogeneous mixture
300s - Q7
how many neutrons are in the atom ofmercury 80Hg201?
180
80
121
201
300s - Q8
what is the number of electrons, protons and neutrons in 16O?
11 electrons, 9 protons, 9 neutrons
8 electrons,8 protons, 8 neutrons
10 electrons, 9 protons, 9 neutrons
8 electrons, 16 protons, 16 neutrons
300s - Q9
the Number of Neutrons C14 is?
6
8
14
12
300s - Q10
Which of the following statement is not true?
Neutrons have no charge
A nucleus has a positive charge
Proton have a positive charge
Neutrons have a negative charge
300s - Q11
electrons are?
positively – charges particles with negligible mass
positively – charges particles with mass
negatively – charges particles with mass
negatively – charges particles with negligible mass
300s - Q12
isotopes are atoms of the same element that differ in?
the number of neutrons
the number of protons
the atomic number
the number of electrons
300s - Q13
which of the following Isotopes
Na & K
I (125) & I (127)
O & O (-2)
S & Cl
300s - Q14
A MASS spectrometer shows that a sample of terrestrial copper contains two isotopes :63 cu (69.15%, atomic mass62.9296) And 65cu(30.85% atomic mass 64.9278) What is the atomic weight for this sample of copper?
63.55 amu
64.00 amu
64.33 amu
65.55 amu
300s - Q15
Number of a proton is heavier than an electron by ….
180 times
200 times
1840 times
18 times
300s