Science 8 Unit 3

What is a neutral pH?

7

Liquid homogeneous mixture in which the solute is distributed evenly within the solvent

Solution

An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of_____ amu.

9

A compound that increases hydrogen ions (H+) when it is dissolved in a solution

Acid

What is the name of the group of elements that are human-made and do not occur in nature?

Actinides

Which of the following techniques can be used to separate a homogeneous mixture into its component parts?

Apply pressure

Which of the following statements is true about the periodic table?

Atomic radius increases moving down a column

A compound that increases the hydroxide ions (OH−) when it is dissolved in a solution

Base

Which of the following methods separates a homogeneous solution by spinning the solution very fast?

Centrifuge

What is the attraction between atoms when they react called?

Chemical bond

Positively charged nucleus

Ernest Rutherford

How will the concentration of H+ and OH− ions change when a substance with a pH 3.2 is added to water?

H+ will increase and OH− will decrease

Mixture that has its different components mixed unevenly within the substance

Heterogeneous

Which type of mixture can be separated using magnetism?

Heterogeneous mixture whose components are attracted differently to a magnet

Mixture that has its different components mixed evenly within the substance

Homogeneous

Plum pudding model

J.J. Thomson

Discovery of neutrons

James Chadwick

Atoms indivisible

John Dalton

Which of the following statements does not describe the structure of an atom?

Most of the mass of an atom comes from the electron cloud.

Consists of a single element or type of compound

Pure substance

Homogeneous mixtures can only be chemically separated into their individual components?

Yes