What is the difference between an element and a compound?

• An element is a pure substance consisting of one type of atom, while a compound consists of two or more types of atoms bonded together.

• An element is a mixture of different substances, while a compound is a pure substance.

• An element can be broken down into simpler substances, while a compound cannot.

• An element is always a solid, while a compound can be in any state.

What is the difference between an mixture and a compound?

• An mixture is a pure substance consisting of one type of atom, while a compound consists of two or more types of atoms bonded together.

• An a mixture is not a pure substance and the parts are only physically combined, while a compound is a pure substance chemically bonded together.

• An mixture can be broken down into simpler substances, while a compound cannot.

• An mixture is always a solid like a salad, while a compound can be in any state.

A diatomic element is a molecule composed of two of the same type of atoms. Which of the following are examples of diatomic elements?

• Oxygen and Nitrogen

• Carbon and Helium

• Neon and Argon

• Silicon and Phosphorus

A heterogeneous mixture is a mixture where the components are not uniform throughout. A homogeneous mixture is a mixture where the components are uniform throughout. Which of the following is an example of a heterogeneous mixture?

• Saltwater

• Air

• Salad

• Vinegar

What is a physical property of matter? Give a definition and three examples.

• A characteristic that can be observed or measured without changing the substance's identity, such as color, melting point, and density.

• A characteristic that involves a substance's ability to undergo a specific chemical change, such as flammability, reactivity, and acidity.

• A property that describes the energy changes that occur during a chemical reaction, such as enthalpy, entropy, and free energy.

• A property that involves the interaction of matter with electromagnetic radiation, such as absorption, emission, and reflection.

Tags

NGSS.MS-PS1-4

What is a chemical property of matter? Give a definition and three examples.

• A characteristic that can be observed without changing the substance's chemical identity, such as color, melting point, and density.

• A characteristic that describes the ability of a substance to undergo a specific chemical change, such as flammability, reactivity with acid, and oxidation.

• A characteristic that can be measured using a ruler, such as length, width, and height.

• A characteristic that describes the physical state of a substance, such as solid, liquid, and gas.

What is a physical change in matter?

• A change that alters the form or appearance of a substance but does not make the substance into another substance.

• A change that results in the formation of new chemical substances.

• A change that involves the breaking and forming of chemical bonds.

• A change that is irreversible.

What is a chemical change in matter? Give a definition and two examples.

• A chemical change is a change in which the composition of a substance is altered, resulting in the formation of a new substance. Examples include rusting of iron and burning of wood.

• A chemical change is a change in the state of matter without altering the chemical composition. Examples include melting of ice and boiling of water.

• A chemical change involves the physical transformation of a substance without any change in its chemical properties. Examples include dissolving sugar in water and freezing of water.

• A chemical change is a temporary change that can be easily reversed. Examples include stretching of rubber and folding of paper.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following are three indications that a chemical reaction is taking place? Choose all that apply.

• Change in color

• Formation of gas (bubbling)

• Change in state

• Change in temperature.

Tags

NGSS.MS-PS1-2

What are the four primary states of matter?

• Solid, Liquid, Gas, Plasma

• Solid, Liquid, Gas, Vapor

• Liquid, Plasma, Magma

• Liquid, Gas, Plasma, Ice

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4