Elements, Compounds and Mixtures

In a compound, the elements are always combined in a ___________ ratio.

Answer explanation

In a compound, the elements are always combined in a fixed ratio. This means that the proportion of each element remains constant, regardless of the amount of the compound.

Tags

NGSS.MS-PS1-1

Give 10 examples of Colloids

2 min video

An element is a substance that cannot be broken down into ___________ substances.

Answer explanation

An element is defined as a pure substance that cannot be broken down into simpler substances. Therefore, the correct answer to fill in the blank is 'simpler'.

The smallest unit of an element is called an ___________?

Answer explanation

The smallest unit of an element is called an atom. Atoms are the basic building blocks of matter, consisting of protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

What type of mixtures are these?

Groups:

(a) Muddy Water

,

(b) Butter

,

(c) Air that we breath

,

(d) Kool-aid mixed in water

• Colloid

• Suspension

• Homogeneous Mixture

• Heterogeneous Mixture

The air we breathe is a ___________?

Answer explanation

The air we breathe is a mixture of gases, primarily nitrogen and oxygen, along with trace amounts of other gases. This composition makes it a mixture rather than a single substance.

Match the following

• A combination of two or more substances that retain their individual properties

• Homogeneous mixture

• A pure substance that cannot be broken down into simpler substances

• Mixture

• A substance made of two or more elements chemically bonded together

• Compound

• A mixture that is uniform in composition throughout

• Element

• A mixture that has a non-uniform composition

• Heterogeneous mixture

This ___________ cannot be created or destroyed in a chemical reaction but it can change to a different form.

Answer explanation

The correct choice is 'matter' because it is a fundamental concept in chemistry that states matter cannot be created or destroyed in a chemical reaction, although it can change forms, such as from solid to liquid.

Tags

NGSS.MS-PS1-5

Give 10 examples of suspensions

2 min video

This type of ___________ mixture has visibly different parts that can be seperated by physical means?=.

Answer explanation

The correct choice is 'heterogeneous' because it describes a mixture with visibly different parts that can be separated by physical means, unlike homogeneous mixtures which are uniform throughout.