Chemical Reactions Lesson

Oscar mixed two samples together: a brown solid that melts at about 1,300°C and a colorless liquid that melts at about 20°C. He analyzed the results and found two ending substances. One of the ending substances melts at about 250°C. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams (answers) shows the repeating groups of atoms that make up the samples the chemist mixed together?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Michael is developing a chemical to help foods stay fresh longer. He mixed a red liquid substance and a colorless solid substance together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Michael found two white substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Stephanie combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances. She was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. Stephanie created a model of the repeating groups of atoms that might make up the two ending substances.

• Stephanie's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing reactant.

• Stephanie's model is correct because the properties are different and the atoms are rearranged.

• Stephanie's model is incorrect because not all atoms are accounted for.

• Stephanie's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing product.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, everything to the right of the arrow is called ______________.

• Products

• Yields

• Molecules

• Reactants

Tags

NGSS.MS-PS1-5

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

In a chemical equation, is it true that -

• the reactant side and product side can have different numbers of atoms for each element

• there can be different elements on the reactant side and the product side

• an element or compound must be accompanied by a phase change

• the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made

Tags

NGSS.MS-PS1-5

Which of the following is the general formula for a decomposition reaction?

• A + B  → AB

• AB → A + B

• AB + C → AC + B

• AB + CD → AC + BD

The following is what type of reaction:
NH₃ + HCl  → NH₄Cl

• Synthesis

• Decomposition

• Single Replacement Replacement

• Double Replacement Replacement

Tags

NGSS.MS-PS1-5

Classify
HI → H₂ + I₂

• synthesis

• decomposition

• single replacement

• double replacement

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Classify
Zn + H₂S → ZnS + H₂

• synthesis

• combustion

• single replacement

• double replacement