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