Elements, Compounds and Mixtures

In a compound, the elements are always combined in a (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 (a)   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 (a)   ?

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

• Suspension

• Heterogeneous Mixture

• Homogeneous Mixture

• Colloid

The air we breathe is a (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 mixture that has a non-uniform composition

• Heterogeneous mixture

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

• Mixture

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

• Homogeneous mixture

• A mixture that is uniform in composition throughout

• Compound

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

• Element

This (a)   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 (a)   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.