Comprehensive SLO review

• periods

• groups

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25 grams. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

• 25 grams

• greater than 25 grams

• less than 25 grams

• 0 grams

Tags

NGSS.MS-PS1-5

How many oxygen atoms are in Cu(KMnO₄)₃

• 1

• 4

• 7

• 12

Tags

NGSS.MS-PS1-1

Determine the number of hydrogen atoms in 3Ca(C₂H₃O₂)₂

• 2

• 4

• 12

• 18

Tags

NGSS.MS-PS1-1

The atomic number tells you what?

• number of electrons

• number of protons

• number of neutrons

• both electrons and protons in an atom

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction

• Mass is created in a physical change

• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

• Mass is neither created not destroyed

Tags

NGSS.MS-PS1-5

What group number os Phosphorus in?

• 3

• 12

• 15

• 18

In the reaction A + B --> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?

• 4g

• 5g

• 9g

• 14g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The number to the lower side of an element (H₂O) is a

• subscript

• superscript

• coefficient

• charge

Does the following equation obey the Law of Conservation of Mass?

2Fe₂O₃ + 3C --> 4Fe + 3 CO₂

• Yes

• No

Tags

NGSS.MS-PS1-5