Worksheets8th Science STAAR Cat 1 Review
Total questions: 36
Worksheet time: 25mins
What subatomic particle is coloured red in this image?
proton
neutron
electron
What vocabulary word completes the missing box in the table?
electron cloud
nucleus
atom
electron
The atomic # tells us the # of ____________________ in an atom.
protons
electrons
neutrons
Cassietrons
The mass # tells us the mass of the atom. Which two subatomic particles make up the mass of the atom?
protons and electrons
neutrons and electrons
Kyrontrons and Kytrons
protons and neutrons
What can you do to find the number of neutrons in an atom?
It's the same as the atomic #.
Ask Sierra!
Subtract the atomic # (protons) from the mass # (protons and neutrons)
Multiply the mass # (protons and neutrons) and the atomic # (protons)
Valence Electrons of Argon
5
6
7
8
True or False: Atoms that have a valence electrons of less than eight are not stable.
true
false
How many valence electrons are found in atoms of group 14?
4
3
14
16
When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?
The total number of neutrons in the unknown element
The total number of particles in the nucleus of the unknown element
The number of protons in the nucleus of the unknown element
The number of valence electrons in the unknown element
What group is the most reactive metals?
2
18
1
16
What group is the most reactive non metals?
1
17
2
1
Which of the following elements is a METAL?
Na
Ne
As
Which element has 4 energy levels?
F
Cl
Br
I
Which element is ductile and malleable?
Mg
Cl
Xe
Which element is a GOOD CONDUCTOR?
Au
O
He
Which element is located in Group 18, Period 2?
(a)
Which element is located in Group 5, Period 6?
(a)
How many elements are in C6H12O6?
1
2
3
4
How many atoms of carbon (C) are in C6H12O6?
3
6
12
24
Element or Compound?
H2O
Element
Compound
Which of the following is a compound?
Co
O2
C
CO2
The blue numbers in the image below represent _______
I don't know, and don't want to try
Coefficients
Subscripts
none of the answers are correct
How many TOTAL atoms are in:
H2SO4
6
5
7
3
In this image, the symbol to the right of the arrow (in black) are called _______.
Products
Reactants
Subscripts
Coefficients
All of the following are chemical changes except:
Iron rusting
Water evaporating
Wood burning
Food rotting
How many molecules of methane are there?
0
1
2
4
A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. Indications that a chemical change was taking place could be observed when –
the white crystals were added to the clear liquid.
the crystals dissolved in the liquid leaving only the liquid visible
There are no indications of chemical change
the temperature of the liquid increased and an unexpected color change occurred.
You know that a chemical reaction is occurring here because you see __________________ . (Pick 3)
purple color
smoke
ice formation
fire
a yellow precipitate
We know that there was a chemical reaction occurring when 2 clear liquids were mixed together. That is because we show the production of a _____________.
solid.
precipitate.
gas.
Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, nonmetal or metalloid. Which table was completed correctly?
A
B
C
D
Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q. Which statement best describes the positions of the two elements in the periodic table?
the two elements are in the same period, with element R the first element in the period and element Q the last element
the two elements are side by side in the same period, with element Q to the left or element R
the two elements are in the same group, with element R just above element Q
the two elements are in the same group, with element Q at the top of the group and element R at the bottom
Students in a science class prepared flash cards so that they could quiz one another about the arrangement of the periodic table. One of the flash cards contained information about two elements, Element L and Element M.
The students had to use the information on the flash card to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in locations that match the information on the flash card?
