NGSS.MS-PS1-5

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

• 1, 2,1
• already balanced
• 2,1,1
• 1,1,2

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NGSS.MS-PS1-5

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

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NGSS.MS-PS1-5

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

• 13

• 8.8

• 0.99

• 1.0

Tags

NGSS.MS-PS1-5

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

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NGSS.MS-PS1-5

How many grams of products should be found in the equation 12.2g + 6.0g -----> ?

• 12.2

• 6.0

• 18.0

• 18.2

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NGSS.MS-PS1-5

The validity of scientific theories and laws depends on evidence. Which of the following statements of evidence supports a law rather than a theory?

• Electrons orbit the nucleus of an atom within a certain radius.

• DNA analysis reveals that a modern species is related to an extinct species.

• Seafloor spreading occurs at a rate of three centimeters per year in the mid-Atlantic.

• The amount of matter in a closed system is the same at the start of a reaction as at the end of the reaction.

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NGSS.MS-PS1-5

Matter can not be created nor destroyed: it can only be

• Destroyed a little bit
• Invisible
• Transformed, changed
• None of the above

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NGSS.MS-PS1-5

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.MS-PS1-5

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes
• no

Tags

NGSS.MS-PS1-5

Determined whether the following equation is balanced or unbalanced. Ag + O_{2 --->} 2Ag₂O

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5