Science molecules and compounds

How do we determine the number of atoms of each element in a chemical formula?

• count the upper case letters

• Fly to the moon

• Count he numbers

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NGSS.MS-PS1-1

What does a subscript and coefficient tell us in a chemical formula?

• The number of elements

• The number of atoms

• The amount of mass

• The year

How does a chemical equation show that if follows the law of conservation of mass?

• same Number of people on each side

• all lower cases

• The same number of mass and elements on each side of the equation

• Tacos

Tags

NGSS.MS-PS1-5

What are the evidences of a chemical reaction?

• Gas,light,persipitant,color,temp

• Stir

• Boom

• Dissolves

Tags

NGSS.MS-PS1-2

What is the difference between a chemical and an physical change? Give Examples

• Trees

• Physical makes something new Chemical doesn’t

• Chemical makes something new physical doesn’t

Tags

NGSS.MS-PS1-2

How do the properties of a substance before a chemical reaction compare to after the reaction?

• Things blow up

• Nothing changes

• They are different things but the same mass

• People die

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How does a chemical reaction follow the law of conservation of mass?

• The mass stays the sam before and after action occurs

• Blows up

• Shows signs of chemical reaction

Tags

NGSS.MS-PS1-5

Is H20 a compound

• yes

• No

Tags

NGSS.MS-PS1-1

How many atoms are in H20+PNa=PH2+NaO

• 4

• 6

• 1

• 5

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

What does the law of conservation of mass state

• Mass cannot be created nor destroyed

• Mass is a concept

• Atoms are actually fake

• elements don’t contain mass

Tags

NGSS.MS-PS1-5