Chemistry Solutions

Which diagram shows diffusion?

• A
• B
• C
• D

The electronic structures of atoms P and Q are shown.
P and Q react to form an ionic compound.
What is the formula of this compound? 

• PQ₂ 
• P₂Q 
• P₂Q₆ 
• P₆Q₂ 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

An element Y has the proton number 18. The next element in the Periodic Table is an element Z.
Which statement is correct? 

• Element Z has one more electron in its outer shell than element Y. 
• Element Z has one more electron shell than element Y. 
• Element Z is in the same group of the Periodic Table as element Y. 
• Element Z is in the same period of the Periodic Table as element Y. 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which atom has twice as many neutrons as protons?

• ¹₁H 
• ²₁H
• ³₁H
• ⁴₂He

Which is a simple covalent molecule? 

• conducts electricity
  when solid and when molten, not volatile
  
• conducts electricity
  when solid but not when molten, is volatile
• conducts electricity
  when molten but not when solid, not volatile
• does not conduct electricity, is volatile

The equation for the reaction between magnesium and dilute sulfuric acid is shown.
Mg + H₂SO₄ → MgSO₄ + H₂
M_r of MgSO₄ is 120.  Which mass of magnesium sulfate will be formed if 12 g of magnesium are reacted with sulfuric acid? 

• 5g 
• 10g 
• 60g 
• 120g 

Tags

NGSS.HS-PS1-7

The equation for the burning of hydrogen in oxygen is shown. 2H₂(g) + O₂(g) → 2H₂O(g) What does this equation indicate? 

• 2 atoms of hydrogen combine with 2 atoms of oxygen. 
• 2 g of hydrogen combine with 1 g of oxygen. 
• 2 moles of steam can be obtained from 0.5 mole of oxygen. 
• 2 moles of steam can be obtained from 1 mole of oxygen. 

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

In terms of electrons, what happens when potassium combines with iodine to form a compound? 

• The atoms of both elements each lose one electron. 
• The atoms of both elements each gain one electron. 
• The potassium atoms each lose one electron and the iodine atoms each gain one electron. 
• The potassium atoms each gain one electron and the iodine atoms each lose one electron. 

Tags

NGSS.HS-PS1-2

How many bananas in 3.5 moles of bananas?

• 3.5
• 3.5 x 6 x 10²³
• 35 / 6 x 10²³

Balance the following reaction:
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)

• 1,2,1,2
• 2,1,1,2
• 1,2,1,1
• 1,2,2,2