WorksheetsSTAAR Sci Category 1
Total questions: 35
Worksheet time: 4hrs 57mins
An atom of an element has 36 protons, 36 electrons, and a mass number of 84? How many neutrons?
36
72
48
8
What types of particles are found in the cloud surrounding the atom's nucleus?
positively and negatively charged particles
negatively charged particles only
neutral and positively charged particles
positively charged particles only
Which of the following is the best description of an electron?
No charge and the same mass as a proton
negative charge and much less mass than a proton
positive charge and much more mass than a neutron
negative charge and the same mass of a neutron
Atoms of a certain element have 11 protons and 1 valence electron. Which statement is correct?
the element is sodium and it is not reactive
the element is fluorine and it is highly reactive
the element is fluorine and it is not reactive
the element is sodium and it is highly reactive
What characteristic of an atom always determines it's identity?
number of neutrons
number of protons
number of valence electrons
location of valence electrons
Which characteristic of calcium is most closely related to its chemical reactivity?
20 protons in each calcium atom
calcium's density is 1.54 g.cm3
2 valence electrons in each atom of calcium
one calcium atom has an atomic mass of 40.078 amu
Which two elements are in the same period?
F and Cl
Sn and Rb
K and Ba
Se and Te
Which process is the best example of a physical change in the digestive system?
saliva converting starch molecules into simple sugar
digestive enzymes breaking down proteins into smaller parts
intestinal bacteria converting lactose into simple sugars
teeth grinding an almond into smaller pieces in the mouth
6 CO2 + 6 H2O → C6H12O6 + 6 O2
How many oxygen atoms in total are present in the reaction?
10
21
12
18
6 CO2 + 6 H2O → C6H12O6 + 6 O2
How many carbon atoms in total are present in the reaction?
6
18
12
10
1 A student drew atomic models of four elements.
Based on these drawings, which element is the least reactive?
Neon, because it has two energy levels with eight electrons in the second level
Chlorine, because it has three energy levels with seven electrons in the third level
Gallium, because it has four energy levels with three electrons in the fourth level
Tin, because it has five energy levels with four electrons in the fifth level
1 1 How many valence electrons are in an atom of each element in Group 15 in the periodic table?
05
06
15
16
As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedures. They measured the mass of each substance before and after each reaction. The table shows their observations.
Assuming the students did not make any careless errors, what likely explains these changes in mass?
Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.
Procedure 1: One of the reactants was converted to thermal energy.
Procedure 2: All the products were liquids.
Procedure 1: The reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.
Procedure 1: One of the products was a gas that escaped into the air.
Procedure 2: A gas from the air reacted with one of the other reactants.
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, a nonmetal, or a metalloid.
Which table was completed correctly?
Students were asked to identify the location of elements in the periodic table based on clues printed on game cards.
Based on the data, which periodic table shows the correct location of the four elements?
Which statement correctly describes the location and charge of the electrons in an atom
The electrons are inside the nucleus and have no charge.
The electrons are outside the nucleus and have no charge.
The electrons are inside the nucleus and have a negative charge.
The electrons are outside the nucleus and have a negative charge.
A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students place it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process.
Which observation of this process provides evidence of a chemical reaction?
Hot water heated the aluminum foil.
The liquid solution changed color.
The pan was lined with aluminum foil.
The hot water cooled
What type of cell has a nucleus?
eukaryotic
prokaryotic
What is multicellular?
one cell
no cells
many cells
no nucleus
What type is the cell shown?
Prokaryotic Cell
Eukaryotic Cell
The following are inherited traits of humans EXCEPT...
long hair
blue eyes
long eyelashes
small dimples
