Font size
WorksheetsChem for Bio Chapter 2 sec 1 and 2
Total questions: 24
Worksheet time: 16mins
What are the smallest basic units of all matter?
molecules
atoms
elements
ions
no significant mass, remain inside the nucleus and have a negative charge
no significant mass, found in orbits around the nucleus and have a negative charge
mass = 1 amu, remain inside the nucleus and have a positive charge
mass = 1 amu, found in orbits around the nucleus and have a negative charge
Which particle is found in the nucleus and has no charge?
The number of protons in an atom is equal to the number of _ .
neutrons
electrons
ions
atomic mass
The total number of protons and neutrons in the nucleus of an atom
Atomic Number
Mass Number
Atomic Theory
Electron Cloud
An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?
15
31
16
47
What is the mass number of "F"?
Use the image of the block from the periodic table, to determine the number of neutrons found in an atom of Nitrogen.
21
Chemicals that are formed when atoms are joined together
(a)
How many electrons does the first shell hold?
1
2
4
8
The bonds found within a water molecule are
covalent.
hydrogen.
ionic.
van der Waal forces.
Water is polar because
the molecule has two poles, at which it is colder than the other regions of the molecule.
the water molecule is neutral.
the unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
the unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
An example of a van der Waals force is a(n)
covalent bond.
ionic bond.
hydrogen bond.
oxygen bond.
A substance in a solution that dissolves the other substance and is present in the greater amount is called the
solute.
acid.
solution.
solvent.
Atoms share pairs of Electrons in what kind of bond
Covalent
Ionic
Electrical
Cohesive
_____________ is an atom that has gained one or more electron.
An anion
A cation
An isotope has
the same number of protons but different number of neutrons.
the same number of protons, but different number of electrons.
the same number of neutrons but different number of protons.
a different number of protons and neutrons.
Which list of pHs are in order of increasing H+ ions?
6, 9, 12
9, 12, 6
12, 9, 6
9, 6, 12
What is pH a measure of?
Density
Mass
Hydrogen Ion Concentraion
Polarity
Which of the following pH values represents the greatest concentration of -OH ions?
3
6
9
1
