Topic 3 Chemical Reactions

What do you call people who are afraid of Santa Claus?

• Claus-trophobic

• Elfobia

What are Chemical Reactions?

• It's when you mix substances.
• a process in which atoms rearrange to form new substances
• When something bubbles.
• letter and numbers showing the types and number of atoms

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT evidence that that a chemical reaction has occurred?

• produces light/heat
• production of a gas
• formation of a precipitate
• melting

Tags

NGSS.MS-PS1-2

A different chemical substance is formed when _____.

• water boils
• metal rusts
• ice melts
• rock is crushed

Tags

NGSS.MS-PS1-2

A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?

• cutting a piece of paper
• folding a piece of paper
• tearing a piece of paper
• burning a piece of paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.

• reactants
• products
• neutrals
• energizers

If you combine two substances in a beaker at room temperature and the beaker feels cold to the touch, it means that the substances:

• have not reacted with each other
• have undergone an endothermic reaction
• have undergone a physical change
• have undergone an exothermic reaction

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

In any chemical reaction, the mass of the products is always:

• slightly less than the mass of the reactants
• much less than the mass of the reactants
• the same as the mass of the reactants
• greater than the mass of the reactants

Tags

NGSS.MS-PS1-5

The large number in front of a chemical formula or compound is the ___________. 

• coefficient
• product
• physical
• chemical

Is the following equation balanced or unbalanced?
Fe + S --> FeS

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5