Classify the following as either an element, a compound, a homogeneous mixture, or a heterogeneous mixture.
a. homogeneous mixture
b. element
c. heterogeneous mixture
d. compound

salt dissolved in water
muddy water
sodium fluoride (naf)
silver (ag)

Salt issolved in water: homogeneous mixture

muddy water : heterogeneous mixture

Sodium fluoride = compound

Silver = element

Explanation:

Step 1:

A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.

A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture.

A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.

An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements cannot be broken down using chemical reactions.

Salt dissolved in water = Salt is soluble in water, which would give a homogeneous mixture

Muddy water = Muddy water, on the other hand is a heterogeneous mixture because mud can settle, leaving the mixture with much less mud at the top of the bucket than the bottom.

Sodium floride =  a compound made of 2 elements: Sodium and fluoride

Silver = An element, it can be found on the period table.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e