Chemistry 01
Chemistry 02
Chemistry 03
Chemistry 04
Chemistry 05
100
What are tiny particles that make up matter?
a. charges
b. atoms
c. electricity
d. forces
b. atoms
100
What is the smallest unit of matter?
a. atom
b. element
c. compound
d. molecule
a. atom
100
What happens to the atoms in a reaction?
a. new atoms are created
b. new atoms are made
c. atoms are rearranged
d. none of the above
c. atoms are rearranged
100
The following is the equation for sucrose. C12H22O11 Select all that apply to this equation.
a. carbon = 12
b. carbon = 22
c. hydrogen = 12
d. hydrogen = 22
e. oxygen = 11
f. oxygen = 22
a. carbon = 12
d. hydrogen = 22
e. oxygen = 11
100
What are valence electrons?
a. inner most energy level
b. outermost energy level
c. protons
d. neutrons plus protons
b. outermost energy level
200
How many atoms of Oxygen are in the formula 2H2SO4?
a. 2
b. 4
c. 6
d. 8
d. 8
200
What is required for a reaction to take place?
a. reduction in energy
b. activation energy
c. activation atoms
d. activation elements
b. activation energy
200
Which of the following describes the conservation of mass principle?
a. gravity = 9.8m/s2
b. matter cannot be created nor destroyed
c. matter can be created and destroyed
d. none of the above
b. matter cannot be created nor destroyed
200
Which part of an element is responsible for chemical bonds?
a. Proton
b. Neutron
c. Electron
d. Nucleus
c. Electron
200
How many protons and neutrons are in this isotope of copper?
a. 63 protons, 29 neutrons
b. 29 protons, 34 neutrons
c. 34 protons, 29 neutrons
d. 29 protons, 63 neutrons
b. 29 protons, 34 neutrons
300
Which of these are NOT a physical property of matter?
a. density
b. flammability
c. hardness
d. luster
e. reactivity
f. mass
b. flammability
e. reactivity
300
What are valence electrons?
a. inner most energy level
b. outermost energy level
c. protons
d. neutrons plus protons
b. outermost energy level
300
Which of the following forms of energy is released or absorbed in most chemical reactions?
a. light energy
b. sound energy
c. electrical energy
d. heat energy
d. heat energy
300
The diagram shows the formation of water.
Which of the following occurs when water forms?
a. Two hydrogen atoms are destroyed to form atoms of water.
b. One oxygen atom shares electrons with two hydrogen atoms.
c. Two hydrogen atoms each give an electron to an oxygen atom.
d. One oxygen atom gives an electron to each of two hydrogen atoms.
b. One oxygen atom shares electrons with two hydrogen atoms.
300
A Ca2+ ion differs from a Ca atom in that the Ca2+ ion has __________________.
a. more protons
b. fewer protons
c. more electrons
d. fewer electrons
d. fewer electrons
400
Select all of the below that are properties of water.
a. is a great solute
b. universal solvent
c. potential hydrogen concentration
d. can't form acids or bases
e. surface tension
b. universal solvent
c. potential hydrogen concentration
e. surface tension
400
What type of reaction is this?
a. exothermic
b. endothermic
a. exothermic
400
Choose the examples that are not examples of chemical reactions.
a. freezing liquid to an ice cube
b. an apple turing brown when exposed to air
c. burning a scented candle
d. melting a stick of butter
a. freezing liquid to an ice cube
d. melting a stick of butter
400
c. element; element; compound
400
The atomic number is equal to the number of
a. protons
b. neutrons
c. protons + neutrons
d. protons + electrons
a. protons
500
What do the elements Mg, Ca, and Sr have in common? Select all that apply.
a. They have the same atomic mass.
b. They have the same atomic number
c. They have the same number of valence electrons.
d. They are all in the same group
e. They are all in the same period.
f. Similar chemical and physical properties
c. They have the same number of valence electrons.
d. They are all in the same group
f. Similar chemical and physical properties
500
What type of reaction is this a picture of?
a. endothermic
b. exothermic
a. endothermic
500
The following equations represent chemical reactions.
Which of the following is a reactant in the above equations?
a. MgOH
b. MgCl2
c. H2O
d. NaCl
b. MgCl2
500
A student obtains two strips of magnesium, Mg, ribbon that are each 33 cm long. One strip of magnesium is placed in a test tube containing 55 mL of water, and the other strip is placed in a test tube containing 55 mL of hydrochloric acid, HCl. Both liquids are at room temperature. The student’s observations are recorded in the table.
Which statement is not supported by the student’s observations?
a. A chemical reaction takes place between magnesium and hydrochloric acid.
b. A gas is released in Test Tube 222 .
c. The substances in both test tubes are reactive only at high temperatures.
d. Energy is released in the reaction involving hydrochloric acid.
c. The substances in both test tubes are reactive only at high temperatures.
500
A sulfide anion has a -2 charge because it LOST two valence electrons.
a. True
b. False
b. False