Chemical Bonding and Reactions

A change in matter that produces new substances is call a

• chemical reaction

• mixture

• physical change

• solution

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NGSS.HS-PS1-2

NGSS.HS-PS1-4

What is one observable characteristic of a chemical reaction?

• Change in hardness.

• Change in shape.

• Bubbles forming.

• Change in mass.

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NGSS.MS-PS1-2

A shorter, easier way to show a chemical reaction, using symbols instead of words.

• Chemical formula

• Chemical reaction

• Chemical symbol

• Chemical equation

Substances you wind up with after a chemical reaction has occurred.

• reactants

• products

• catalyst

• inhibitor

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NGSS.HS-PS1-7

This type of reaction needs energy to get started but then keeps going on its own.

• fusion reaction

• fission reaction

• endothermic reaction

• exothermic reaction

Materials that increase the rate of a reaction.

• catalyst

• inhibitor

• lowering the temperature

• decreasing the concentration of reactants

Tags

NGSS.HS-PS1-5

If you wanted to decrease the rate of reaction, what action would you need to take?

• decrease the temperature

• insert a catalyst

• increase the surface area

• double the reactants

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NGSS.HS-PS1-5

Mg +CuCl2 = MgCl2 + Cu

Which type of reaction is shown above?

• synthesis

• decomposition

• replacement

• combustion

A chemical change is different than a physical change because in a chemical change

• Chemicals are used

• Molecules do not physically touch

• A new substance is formed and in a physical change no new substance is formed

• The change can be seen but in a physical change it cannot

In a chemical reaction

• The atoms of the reactants always stay together to form the products

• The atoms of the reactants unbond, rearrange, and then rebond to form the products

• New atoms are formed which combine to make the products

• Some atoms disappear while others multiply to form the products

Tags

NGSS.HS-PS1-7