Chemical Equation

In a chemical equation...

• a new substance is formed

• new atoms are formed

• old atoms disappear

• a equal sign is always used

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

• top, bottom

• right, left

• left, right

• bottom, top

The amount of atoms on each side of a chemical equation are

• different

• the same

Tags

NGSS.MS-PS1-5

Chemical equations

• give directions for naming compounds

• describe only biological changes

• describe chemical reactions

• show how to write formulas

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

In a chemical equation "aq" means ​ (a)   . This word means "dissolved in water". The compound or element has been put into water to form a solution ​or homogenous mixture. "l" means ​ (b)   . this means the compound or element is in the liquid phase. It has not been mixed with anything else. The arrow in a chemical equation means ​ (c)   . On the left side of the arrow are the ​ (d)   , and on the right side of the arrow are the ​​ (e)   .

• Aqueous

• liquid

• yields

• reactants

• products

In a chemical equation, the arrow points towards the ​ (a)   of the reaction.

• products

• reactants

• elements

• compounds

The starting materials in a chemical equation are the ​ (a)   The ending substances are the ​ (b)   ​

• reactants

• products

• yields

• ingredients

Tags

NGSS.MS-PS1-5

​ ​ (a)   K₃PO₄ + ​ ​ (b)   AgNO₃ --> ​ ​ ​ (c)   KNO₃ + ​ (d)   Ag₃PO₄

• 6

• 4

• 5

• 7

• 8

• 9

• 2

• 3

• 1

Tags

NGSS.MS-PS1-5

Number placed in front of a chemical formula is a (a)   and a small number placed after an element is a ​ (b)  

• product

• coefficient

• reactant

• subscript

• superscript

​ (a)   denote the number of atoms of an element in a molecule, and ​ (b)   denote the number of a molecule in an equation

• Subscripts

• Coefficients

• Superscripts

• Exponents

• Parentheses

• Cofactors