Chemical Changes in the Lab

When the equation Al + Br₂ --> AlBr₃ is balanced, the coefficient for Al is

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

A reaction that has two compounds as reactants and two compounds as products is most likely a:

• synthesis reaction

• single replacement reaction

• double replacement reaction

• decomposition reaction

A number written in front of a chemical formula is called a(n)

• subscript

• superscript

• yield

• coefficient

The image below represents a:

• synthesis reaction

• decomposition reaction

• single replacement reaction

• double replacement reaction

Tags

NGSS.MS-PS1-2

The image below represents a:

• synthesis reaction

• decomposition reaction

• single replacement reaction

• double replacement reaction

Tags

NGSS.MS-PS1-2

A _____________ change is any change that alters the form or appearance of a substance but does not change it into another substance.

• physical

• chemical

Tags

NGSS.MS-PS1-4

A change in matter that produces one or more new substances is a ________________ change.

• physical

• chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, the _____________ are always written on the right side of the equation

• reactants

• products

• coefficients

• subscripts

Bread dough rises from bubbles produced when yeast reacts with sugar. What is the evidence of the chemical change?

• formation of a precipitate

• color change

• gas production

• this is actually a physical change

Tags

NGSS.MS-PS1-2

Which of the following is NOT a physical property?

• melting point

• state of matter

• density

• flammability