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What type of reaction is represented by the equation 2H2 + O2 -> 2H2O?

• Combustion reaction

• Single displacement reaction

• Decomposition reaction

• Synthesis reaction

Balance the chemical equation: C3H8 + O2 -> CO2 + H2O

• C3H8 + 5O2 -> 3CO2 + 4H2O

• C3H8 + 4O2 -> 3CO2 + 4H2O

• C3H8 + O2 -> 2CO2 + 2H2O

• C3H8 + 6O2 -> 3CO2 + 4H2O

Tags

NGSS.MS-PS1-5

What is the product of the reaction between hydrochloric acid and sodium hydroxide?

• Carbon dioxide and water

• Water and sodium chloride

• Hydrogen gas and sodium chloride

• Oxygen gas and sodium hydroxide

Tags

NGSS.MS-PS1-2

What is the overall equation for cellular respiration?

• CO2 + H2O → C6H12O6 + 6O2 + ATP

• 6CO2 + 6H2O + ATP → C6H12O6 + 6O2

• C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

• C6H12O6 + 6O2 → 6CO2 + 6H2O + Glucose

Tags

NGSS.MS-LS1-7

According to Newton's first law of motion, an object at rest will stay at rest unless acted upon by what?

• external force

• gravity

• internal force

• friction

What is the formula for Newton's second law of motion?

• F = ma

• F = m/a

• F = 1/2ma

• F = mv

Tags

NGSS.MS-PS2-2

According to Newton's third law of motion, for every action, there is an equal and opposite what?

• momentum

• reaction

• acceleration

• force

Tags

NGSS.MS-PS2-1

Which function is graphed?

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A farming field can be ploughed by 6 tractors in 4 days. When 6 tractors work together, each of them ploughs 120 hectares a day. If two of the tractors were moved to another field, then the remaining 4 tractors could plough the same field in 5 days. How many hectares a day would one tractor plough then?

A student chose a number, multiplied it by 2, then subtracted 138 from the result and got 102. What was the number he chose?