Day 2 -- 8th Grade Science STAAR Review THMS

All living things require oxygen to survive. Where on the periodic table above would you find gases like oxygen? 

• section A 
• section B 
• section C 
• section D 

Tags

NGSS.HS-PS1-1

Henry is investigating the properties of elements in section A. What are the general characteristics of elements from section A? 

• conducts heat and electricity, shiny, and solid 
• mostly gases and are very reactive
  
• share properties of metals and nonmetals 
• liquids that are stable in pure form 

Tags

NGSS.HS-PS1-1

Some elements have properties of metals and nonmetals, which make them useful in electronic devices. Where can these elements be found? 

• section A 
• section B
• section C
• section D 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Transition metals are malleable and are found in section B. What is another property of metals in section B? 

• conducts heat
  
• liquid state of matter
  
• highly reactive and never found as a pure element 
• poor conductors of electricity 

Which two sections of elements are mostly likely to react and form chemical bonds with one another? 

• section A and section B 
• section B and section C 
• section C and section D 
• section D and section A 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

CH₄ +2O₂  →  CO₂ +2H₂O 
How many different elements are involved in this reaction? 

• two 
• three 
• four
• five

Tags

NGSS.MS-PS1-1

CH₄ +2O₂  →  CO₂ +2H₂O 
How many atoms are there on the left side of the equation compared to the right side? 

• The left side has more atoms than the right side. 
• The right side has more atoms than the left side. 
• The left and right side have the same number of atoms. 
• It is impossible to know because it depends on the reaction speed. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

CH₄ +2O₂  →  CO₂ +2H₂O
How many atoms of hydrogen are involved in this reaction? Record you answer below. 

• 6
• 10
• 4
• 2

Tags

NGSS.MS-PS1-5

CH₄ +2O₂  →  CO₂ +2H₂O
Which of the following lab equipment is necessary when conducting this reaction? 

• A filter to safeguard against contaminants in the water used to initiate the reaction. 
• A glass beaker to hold the methane gas.
  
• A magnet to ensure the oxygen is free of iron filings. 
• A fire extinguisher as a safety precaution since the methane gas is flammable. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the hypothetical chemical reaction below, which element will be recombined into two separate atoms of one single element following the reaction?

2AB + C₂ → 2CB + 2A 

• element A 
• element B 
• element C 
• All of the reactants will recombine into two separate atoms of a single element. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5