Properties of Matter, Chemical Reactions, & Periodic Table

What is a chemical property?

• A characteristic of a substance that can be observed without a chemical reaction

• A characteristic of a substance expressed during a chemical reaction

• A type of physical change that occurs in matter

• A reaction that does not change the chemical composition of a substance

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What does reactivity measure?

• The ability of a substance to dissolve in water

• The temperature at which a substance melts

• How quickly a substance undergoes a chemical reaction

• The mass of a substance compared to its volume

What is the significance of reactivity in classifying substances?

• It determines the state of matter of a substance

• It measures the boiling point of a substance

• It helps scientists classify substances based on their chemical behavior

• It is used to determine the color of a substance

Which group of elements is known for being extremely reactive?

• Noble gases

• Alkali metals

• Halogens

• Transition metals

Why are noble gases called "noble"?

• Because they have a royal appearance

• Because they rarely react with other elements, similar to how nobility in Europe interacted with lower social classes

• Because they are the most abundant gases in the atmosphere

• Because they can only be found in noble rocks and minerals

What does combustibility refer to?

• The ability of a substance to dissolve in water

• The likelihood of a substance heating up to a high degree or erupting in flames when heated and exposed to oxygen

• The ability of a substance to produce light

• The reaction of a substance with carbon dioxide

Tags

NGSS.MS-PS1-5

Why do scientists readily identify combustion reactions?

• Because they produce light and heat only

• Because they are easy to perform in the lab

• Because oxygen is required to induce it and combustion always produces water and carbon dioxide

• Because they only occur with methane

What are the three physical properties of matter that the text mentions will be examined?

• Density, melting point, and combustibility

• Density, dissolvability, and flammability

• Density, melting point, boiling point, and dissolvability

• Density, color, and texture

Tags

NGSS.MS-PS1-4

What does density refer to?

• The color of a substance

• The flammability of a substance

• How tightly or loosely packed together the atoms and molecules are in a substance

• The ability of a substance to flow

Why do submarines not sink even though they are made of steel, which is denser than water?

• Because they are coated with a special material that makes them float

• Because they have ballast tanks that are engineered to hold lots of water, making them less dense than water

• Because they are powered by engines that provide upward thrust

• Because they have large air-filled compartments that never allow water to enter