A chemical reaction is...
a. the break down or combination of substances to form one or more new substances.
b. the break down of substances to form new substances.
c. the combination of substances to form new substances.
d. none of the above.
a. A chemical reaction is the break down or combination of substances to form one or more new substances.
A covalent bond is...
a. the attraction between positive and negative ions.
b. the sharing of electrons between two atoms.
c. the transfer of electrons from one atom to another.
d. the force that holds atoms together in a crystal lattice.
b. A covalent bond is the sharing of electrons between two atoms.
What information does the period on the periodic table provide?
a. The number of protons in an element.
b. The number of electrons in an element.
c. The number of energy levels or shells.
d. The number of neutrons in an element.
c. The number of energy levels or shells.
What subatomic particle is located in the nucleus of an atom?
a. Electron
b. Proton
c. Neutron
d. Photon
b. proton
What is the smallest unit of an element that retains its chemical properties?
a. Atom
b. Molecule
c. Ion
d. Compound
a. Atom
Pull from your own knowledge.
What is an example of a chemical reaction that you may see in your day to day life?
Anything where the break down or combination of substances form new ones. Ex: wood burning and turning into ash or jewelry turning green or red.
An ionic bond is...
a. the sharing of electrons between two atoms.
b. the force that holds atoms together in a covalent molecule.
c. the transfer of electrons from one atom to another.
d. the attraction between positive and negative ions.
C. An ionic bond is the transfer of electrons from one atom to another.
In the periodic table, elements in the same column (group) share similar:
a. Atomic masses
b. Electron configurations
c. Number of protons
d. Chemical properties
d. In the periodic table, elements in the same column (group) share similar chemical properties.
What is the charge of an electron?
a. Positive
b. Negative
c. Neutral
d. Variable (depends on the element)
b. Negative
The element mercury (Hg) is unique because it is:
a. A metal
b. A noble gas
c. A liquid at room temperature
d. A nonmetal
c. A liquid at room temperature
In a chemical reaction, what is a precipitate?
a. A gas produced
b. A solid formed from the reaction.
c. A liquid solution
d. A catalyst
b. In a chemical reaction a precipitate is a solid formed from the reaction.
Electronegativity is...
a. the ability of an atom to gain or lose electrons in a chemical reaction.
b. the measure of the size of an atom.
c. the measure/ level of the attraction an atom has for shared electrons in a covalent bond.
d. the number of protons in an atom.
c. Electronegativity is the measure/ level of the attraction an atom has for shared electrons in a covalent bond.
The elements in the periodic table are arranged in order of increasing...
a. atomic number
b. atomic mass
c. number of protons
d. electron affinity
a. The elements in the periodic table are arranged in order of increasing atomic number.
What is the total number of electrons that can occupy the third energy level (n=3) of an atom?
a. 2
b. 8
c. 18
d. 32
c. 18
Which element is essential for life and is a major component of organic compounds?
a. Carbon
b. Oxygen
c. Nitrogen
d. Hydrogen
a. Carbon
Pull from your own knowledge.
What is a possible indication of a chemical reaction?
A precipitate.
A non polar covalent bond is...
a. the sharing of electrons between two atoms with a significant difference in electronegativity.
b. the transfer of electrons from one atom to another.
c. the attraction between positive and negative ions.
d. the sharing of electrons between two atoms with similar electronegativity.
d. A non polar covalent bond is the sharing of electrons between two atoms with similar electronegativity.
What is the main characteristic of alkali metals in Group 1 of the periodic table?
a. High reactivity
b. Low electronegativity
c. Existence as diatomic molecules
d. High ionization energy
a. the main characteristic of alkali metals in Group 1 of the periodic table is high reactivity.
Which of the following elements is a noble gas?
a. Oxygen
b. Neon
c. Fluorine
d. Sodium
b. Neon
What is the atomic number of carbon?
a. 6
b. 12
c. 14
d. 16
a. 6
Pull from your own knowledge.
Why is water boiling on a stove not a chemical reaction even though it releases gas.
Water boiling is a physical change rather than a chemical reaction because the molecular composition of water remains unchanged during the process; only the state of water molecules transitions from liquid to gas due to an input of heat energy from the stove.
A polar covalent bond is...
a. the sharing of electrons between two atoms with similar electronegativity.
b. the transfer of electrons from one atom to another.
c. the attraction between positive and negative ions.
d. the sharing of electrons between two atoms with a significant difference in electronegativity.
d. A polar covalent bond is the sharing of electrons between two atoms with a significant difference in electronegativity.
Which group of elements in the periodic table is known as the "noble gases"?
a. Group 1
b. Group 2
c. Group 17
d. Group 18
d. Group 18 is known as the noble gases.
What is the mass number of an atom?
a. The number of protons in the nucleus.
b. The sum of protons and neutrons in the nucleus.
c. The number of electrons in the atom.
d. The average atomic mass of all isotopes.
b. The sum of protons and neutrons in the nucleus.
Which element is a halogen?
a. Chlorine
b. Calcium
c. Potassium
d. Magnesium
a. Chlorine