Question

Question 13 (Mandatory) (3 points)

Ions are atoms of the same element that have a different number of _____________.

Question 13 options:

nuclei


electrons


neutrons


protons


nucleons

Question 14 (Mandatory) (3 points)
Radium-226 is unstable. What is the process that allows the nucleus of radium-226 to become more stable?

Question 14 options:

hydrogen bonding


radioactive decay


nuclear fusion


ionic bonding


covalent bonding

Question 15 (Mandatory) (3 points)
What parts of an atom can change during a nuclear reaction that cannot change during a chemical reaction?

Question 15 options:

The number of electrons only


The number of protons and electrons


The number of neutrons and electrons


The number of protons and neutrons

Question 16 (Mandatory) (3 points)
Traditional explosives use the energy released by chemical reactions. Nuclear weapons use the energy released by nuclear reactions. Why are nuclear weapons much more destructive than traditional explosives?

Question 16 options:

Chemical reactions always release more energy than they use


Nuclear reactions can release much more energy than chemical reactions


Chemical reactions always use more energy than they release


Nuclear weapons always contain more chemicals than traditional explosive


Chemical reactions can release much more energy than nuclear reactions

Question 17 (Mandatory) (3 points)
The nucleus of some isotopes will spontaneously undergo nuclear decay. These isotopes are said to be radioactive. what causes the nucleus of an isotope to be radioactive?

Question 17 options:

exposure to toxic chemicals


the net charge of the atom


the attraction of protons to electrons


an unstable ratio of protons and neutrons


too many electrons in its orbitals

Question 18 (Mandatory) (3 points)
If a substance can be separated by physical means and it is not the same throughout, what is it?

Question 18 options:

a pure substance


a compound


a heterogeneous mixture


an element


a homogeneous solution

Question 19 (Mandatory) (3 points)
If a substance cannot be separated by physical means or chemical means, it is ___________.

Question 19 options:

a mixture


a solution


heterogeneous


a compound


an element

Question 20 (Mandatory) (3 points)
Water vapor turning to frost is an example of ______________ .

Question 20 options:

deposition


vaporization


sublimation


evaporation


freezing

Question 21 (Mandatory) (3 points)
What does the atomic number of an element represent?

Question 21 options:

the mass of an atom


the number of protons in an atom


the number of neutrons in an atom


the total number of protons, neutrons, and electrons in an atom


the order in which the element was discovered

Question 22 (Mandatory) (3 points)
Which of the following is a common property of Noble Gases?

Question 22 options:

seeks to donate one to three electrons


have a full outer shell of electrons


are highly reactive


easily form chemical compounds


are good conductors of electricity

Question 23 (Mandatory) (3 points)
Which type of element seeks to gain electrons?

Question 23 options:

Non-Metals


Noble Gases


Metals


Isotopes


Metalloids

Question 24 (Mandatory) (3 points)
If a material is ductile, it is most likely a ____________ .

Question 24 options:

Non-Metal


Noble Gas


Ion


Metalloid


Metal

Question 25 (Mandatory) (3 points)
What determines the properties of elements?

Question 25 options:

the average atomic mass


the number of electron shells


the number of neutrons


the number of electrons that fill the outer shell


the total number of electrons

Question 26 (Mandatory) (3 points)
What is happening to the temperature of the substance BEFORE AND AFTER the phase changes?



Question 26 options:

Temperature increases before and after the phase changes.


Temperature increases before the phase change and decreases after the phase change.


Temperature stays the same before and after the phase changes.


Temperature decreases before and after the phase changes.


Temperature decreases before the phase change and increases after the phase change.

Answer 1

Question 13) Electrons

Question 14) Ionic bonding

Question 15) The number of protons and neutrons

Question 16) Nuclear weapons can release much more energy than chemical reactions.

Question 17) An unstable ratio of protons and neutrons

Question 18) A homgenous solution

Question 19) An element

Question 20) Freezing

Question 21) The number of protons in an atom.

Question 22) have a full outer shell of electrons.

Question 23) Non-metals