Biology, 04.10.2020 05:01, emmaccanttlon
I. Match the following.
1.a minus-charged particle of an atom
2.a neutral (no charge) particle found in the nucleus of an atom
3.a positive-charged particle in the nucleus of an atom
4.a system of comparing atomic masses to carbon
a. proton
b. relative mass
c. electron
d. neutron
II. The atomic number of an atom is equal to the number of
a. neutrons
b. electrons
c. protons
III. The atomic number is always equal to the atomic mass.
True
False
IV. Atomic mass minus atomic number =
atomic mass
number of electrons
number of neutrons
number of protons
V. A proton in the nucleus of an atom has an electrical charge of:
neutral
-
+
zero
VI. The atomic number of calcium is 20. This number means that calcium has 20 protons. The atomic mass of calcium is 40. How many neutrons does calcium have? (Remember: protons + neutrons = atomic mass.)
a. 40
b. 60
c. 20
VII. Helium has an atomic number of 2. This number also means that helium has 2 protons. The atomic mass of helium is 4. How many neutrons does helium have? (Remember: protons + neutrons = atomic mass.)
a. 2
b. 4
c. 6
VIII. The relative atomic mass of a proton or neutron is
a. 1
b. 2
IX. The relative atomic mass is always a mass that is compared to the element
a. carbon
b. oxygen
c. hydrogen
X. Name the three kinds of sub-atomic particles found in an atom:
a. Protons
b. Electrons
c. Neutrons
d. Polyhedrons
e. Axons
Answers: 3
Biology, 22.06.2019 09:00, 001234567891011
Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm
Answers: 1
Biology, 22.06.2019 11:00, brainy51
4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.
Answers: 2
Biology, 22.06.2019 13:00, blesskids600
This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient
Answers: 1
I. Match the following.
1.a minus-charged particle of an atom
2.a neutral (no charge) particl...
2.a neutral (no charge) particl...
History, 05.12.2020 21:20
Mathematics, 05.12.2020 21:20
Mathematics, 05.12.2020 21:20
History, 05.12.2020 21:20
Mathematics, 05.12.2020 21:20
English, 05.12.2020 21:20