Worksheets2nd 4.5 Checkpoint Review Part 1
Total questions: 30
Worksheet time: 49mins
A scientist observes that atom A has 10 protons, 13 neutrons and 11 electrons, while atom B has 12 protons, 13 neutrons and 12 electrons. Which best describes atom A and atom B?
Atom B is more negatively charged than atom A since it has more electrons.
They are the same element since they have the same number of neutrons.
They are different elements since they have a different number of protons.
Atom B is more positively charged than atom A since it has more protons.
Fluorine is atomic number 9 and has a mass of 19. How many neutrons would it have?
9
6
19
10
The nucleus of an atom contains-
only neutrons.
protons and neutrons.
protons and electrons.
only electrons.
How is the electron cloud model of an atom different from the planetary model?
The numbers of electrons are different.
The arrangements of the electrons are different.
The shapes of the nuclei are different.
The masses of the atomic particles are different.
Which statement can be correctly attributed to the Billiard Ball Model?
All atoms of the same element are different.
All atoms of the same element are the same.
All atoms of the same element are reacted.
All atoms of the same element are combined.
Which of these atomic models is the oldest?
This model discovered that atoms have a very tiny, positively charged center where most of the mass is found. Which one is it?
What is the name of the model shown?
Billiard Ball Model
Plum Pudding Model
Planetary Model
Electron Cloud Model
Which solution has a density equal to 1.25 g/mL?
Mass = 1.5g Volume = 2.0mL
Mass = 25g Volume = 20mL
Mass = 7.8g Volume = 8.7mL
Mass = 700g Volume = 715mL
Silver is solid at room temperature. This is an example of a —
physical property
chemical property
mixture
compound
Juices from citrus fruits generally have a pH less than 7. Based on this information, you can say these juices are-
acids
bases
neutral
salt solutions
Which chemical property describes a substance that reacts rapidly with oxygen and gives off heat?
combustibility
reactivity
acidity
basicity
Which of the following is a chemical property?
the ability to dissolve in water
the ability to react with an acid
the ability to conduct electricity
the ability to attract metal
A measure of how much mass is contained in a given volume is called —
Density
Area
Volume
Solubility
Which of these is a chemical change?
Freezing water
Wood burning
Iron rusting
Antacid tablets dropped in water
When matter undergoes a change in size, shape, or state, but the chemical make up is NOT changed, it is a ___.
Reactions that take in more total energy to break bonds in the reactants than the total energy released as a product are called ______ reactions.
Which of the following is a compound?
What is a single pure substance made of one type of atom?
A salt
A mixture
A compound
An element
How many different elements are in H2SO4?
2
7
3
6
How many Oxygen (O) atoms are in 4K2CO3?
4
3
8
12
__ Al + __ HCl → __ H2 + __ AlCl3
Which equation is correctly balanced?
2FeO+4C->Fe+2CO₂
SiI₄+2Mg->Si+2MgI₂
4Ba+S₈->2BaS
4HgO->4Hg+3O₂
Which correctly describes how the law of conservation of mass applies to a physical change?
When paper is crumpled into a ball, it loses mass.
When a rock is broken into pieces, some of the matter in the rock is destroyed.
When ice melts, the mass of the liquid water that forms equals the mass of the ice that was originally present.
Matter in the form of steam is created when water is heated.
The materials made, or substances listed on the right side of a chemical equation, are the ___.
