Chapter 12 Lesson 1 Understanding Chemical Reactions

What is the arrow in a chemical equation...
H_{2 +} O --> H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substances at the beginning of a chemical equation are called the ____.

• product
• yield
• chemical symbol
• reactants

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-1

In a chemical reaction, everything to the right of the arrow is called ______________.

• Products
• Yields
• Molecules
• Reactants

Tags

NGSS.MS-PS1-5

Which of the following is evidence of a chemical reaction?

• bubbling

• water changing to ice
• saltwater
• paper being cut in half

Tags

NGSS.MS-PS1-2

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

• H₃PO₄
• H₂SO₄
• HCIO₃
• H₂0

Tags

NGSS.MS-PS1-1

What are Chemical Reactions?

• It's when you mix substances.
• a process in which atoms rearrange to form new substances
• When something bubbles.
• letter and numbers showing the types and number of atoms

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?

• cutting a piece of paper
• folding a piece of paper
• tearing a piece of paper
• burning a piece of paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

Tags

NGSS.MS-PS1-1