Chemistry Review

The correct sequence of steps to balance a chemical equation is:

• Write the unbalanced equation, count atoms, add coefficients, check balance, repeat if necessary.

• Write the products first, then the reactants, and add coefficients randomly.

• Balance the equation by changing subscripts of compounds.

• Add coefficients only to the products side until the equation looks balanced.

Tags

NGSS.HS-PS1-7

The term 'charges' in the context of compounds refers to:

• the electrical properties of atoms or ions within the compound

• the mass of the compound

• the color of the compound

• the temperature at which the compound reacts

Tags

NGSS.MS-PS2-3

The process for naming polyatomic ions involves:

• Identifying the ion and using standard suffixes like -ate or -ite

• Naming the ion based on the number of protons

• Using only the element's symbol

• Assigning random names to each ion

Acids and bases are named and have specific properties. Which of the following best describes how they are named and their properties?

• Acids are named based on their anions and taste sour; bases are named based on their cations and feel slippery.

• Acids are named after metals and taste bitter; bases are named after nonmetals and taste sweet.

• Acids are always solid and have no taste; bases are always liquid and are odorless.

• Acids and bases are both named after their color and have the same properties.

What is the term for the following definition? 'An element (often a transition metal) that can form more than one stable ion with different charges (e.g., Fe2+ and Fe3+).'

(a)  

What is the term for the following definition? 'A compound made of two or more non-metals that share electrons.'

(a)  

What is the term for the following definition? 'An unbalanced chemical equation that shows the formulas of reactants and products but not the correct amounts.'

(a)  

What is the term for the following definition? 'A chemical equation with the same number of each type of atom on both sides.'

(a)  

Tags

NGSS.MS-PS1-5

What is the term for the following definition? 'The starting substance(s) in a chemical reaction (on the left side of the arrow).'

(a)  

Tags

NGSS.MS-PS1-1