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WorksheetsChemistry for biology sec2.1
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
What is matter in organisms made of?
a)
elements
b)
water
c)
elements combined as compounds
d)
all of the above are matter that makes up organisms
2.
Ionic, covalent, van der Waals forces
a)
are types of atoms
b)
are compounds
c)
hold molecules and atoms together
d)
are of no consequence in life forms
3.
Physical and chemical properties are different from the elements that make them up in
a)
mixtures
b)
compounds
c)
atoms
4.
An atom of iron has atomic number 26, how many protons does it have?
a)
52
b)
26
c)
13
5.
A number of elements have different number of neutrons, these elements are called
a)
compounds
b)
molecules
c)
isotopes
d)
atoms
6.
Most of the mass of the atom is contained in the nucleus, which subatomic particle is not in the nucleus and is responsible for chemical properties of atoms?
a)
proton
b)
electron
c)
neutron
d)
quark
7.
This smallest unit of most compounds is formed from covalent bonds and is called
a)
molecule
b)
atom
c)
nanocompounds
8.
Water like other compounds consists of elements combined in the same whole number ratio, 2 hydrogen to 1 oxygen.
a)
sometimes true
b)
rarely true
c)
true every time
d)
false
9.
The unequal sharing of electrons in water makes water a polar molecule leading to the formation of
a)
nano bonds
b)
hydrostatic interactions
c)
molecular initiatives
d)
hydrogen bonds
10.
A substance that helps living systems resist changes in pH is referred to as a
a)
helper T cell
b)
buffer
c)
acid
d)
base
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