What type of reaction is the below reaction?

• Endothermic
• Exothermic
• Isothermic

Tags

NGSS.HS-PS1-4

In the below reaction, which has more stored energy, the reactants or the products?

• Reactants
• Products
• The reactants and products have the same amount of stored energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the molar mass of the compound below?

• 18.00 g/mol
• 36.99 g/mol
• 40.00 g/mol
• 82.98 g/mol

If I have one mole of sodium (Na), how many atoms of sodium do I have?

• 12, or one dozen, atoms
• 6.02 x 10^23 atoms
• 6.636 x 10^-34 atoms
• 3.00 x 10^8 atoms

Tags

NGSS.HS-PS1-7

True or false: burning paper is a chemical change

• True
• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a key indicator of a chemical change?

• change in state of matter
• change in volume
• formation of a precipitate
• change in shape

Tags

NGSS.MS-PS1-2

In the chemical equation 2 H2 ​+ O2​ → 2 H2​O, what does the O2​ represent?

• product
• reactant
• catalyst
• coefficient

What type of reaction is shown below?

• synthesis
• decomposition
• single replacement
• double replacement

What reaction can best be described as two or more chemical species combining together in reaction to form one more complex compound?

• synthesis
• decomposition
• combustion
• double replacement

What scientific principle states that nothing can be created or destroyed, only rearranged in chemical reactions?

• Law of Multiple Proportions
• Law of Conservation of Matter
• Ideal Gas Law
• Second Law of Thermodynamics

Tags

NGSS.HS-PS1-7