9B Grade 9 Matter & Chemical Change - review

The change that occurs when a substance changes from a gas to a solid is referred to as

Sodium metal is placed in chlorine gas. As it burns, white, coarse-grained powder is produced.

A chemical reaction occurs when this evidence is present

When a substance undergoes a chemical change, evidence used does NOT include

This lattice structure represents sodium chloride. What identifies this as an ionic compound?

Freeze-drying is a technique used to preserve food for long periods of time. The first step is

Naming ionic compound rules: 1. name of metal first, 2. name of non-metal ion(s) changes to

In the formula for baking soda NaHCO_3(s) the _(s) indicates that this molecule is

In this element (Potassium) – 39.098 refers to the

The chemical name - following the rules for naming molecular compounds – for N₂O₃ is

The difference between an element and a compound is that an element

Required by many reactions that break down food in the body

_________ identifies which elements and how many are in a compound.

When ionic compounds are formed, the ions combine to form a(n)

The scientist who developed the ‘billiard ball’ model of the atom was

The only statement below that is TRUE about a closed system compared to an open system is that

A substance’s ability to resist being scratched is the physical property of matter known as

In this element (Potassium) – 19 refers to the

This is derived from “khemeia” (a Greek word)

An obvious chemical property of pancakes is

A Tetra Pak is a drink container that is used by manufacturers to package juice. Tetra means

In the table, the following elements would be described as the Noble Gases

The rows in the periodic table vary with amount of elements they contain. These rows are called

Calcium [Ca ²⁺] combines with chlorine [Cl^1-] to produce Calcium Chloride. The correct formula

This symbol means …

In the formula for baking soda [NaHCO_3(s)] _____ indicates how many atoms are in each molecule

Four factors can affect the rate of a chemical reaction. The factor that does NOT belong is

Moving across the periodic table, properties of elements change. Two of most reactive metals

Before 8000 B.C., metals had not been discovered, so humans used only simple tools made from

Sugar C₁₂H₂₂O₁₁ is a molecular compound. This compound contains

‘alkimiya’ (an Arabic word) translates as

Cloudy mixture; particles of the suspended substance so small, cannot be easily separated

Aluminum foam is used to create lighter, safer cars. This is because aluminum foam is

Models of the atom have electrons orbiting the nucleus. The quantum model has electrons in

A chemical reaction takes place when two or more

wood + oxygen → carbon dioxide + water + energy released The reactants are

Pure substances formed because of attraction between charged particles of opposite charges are

food + oxygen → carbon dioxide + water + energy that is used to keep cells alive

When hydrogen peroxide is left out in the sun, it changes to water and oxygen gas.

MRE’s are especially useful for astronauts, soldiers and mountain climbers. MRE stands for

Alkali metals (1+), often react with ions (1-). The group of elements with 1- charge:

How many neutrons does Potassium have?

The Law of Conservation of Mass states that mass

Fire keeps going because of three factors. These factors are

The characteristic that shows properties of elements vary periodically is