unit 2 list 1 chemistry CN

Question 1

atoms

Answer 1

Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms

Question 2

Molecules

Answer 2

A molecule is a group of two or more atoms that are held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions that satisfy this criterion.

Question 3

Substances

Answer 3

A chemical substance is a unique form of matter with constant chemical composition and characteristic properties

Question 4

Homogenous Mixtures

Answer 4

a mixture where the composition is uniform throughout, meaning the components are evenly distributed and indistinguishable from one another, appearing as a single phase with consistent properties no matter which part of the mixture you sample

Question 5

Heterogenous Mixtures

Answer 5

a mixture where the composition is not uniform throughout

Question 6

Chemical Properties

Answer 6

A chemical property is any of a material’s properties that becomes evident during, or after, a chemical reaction; that is, any attribute that can be established only by changing a substance’s chemical identity

Question 7

Physical Properties

Answer 7

A physical property is any property of a physical system that is measurable. The changes in the physical properties of a system can be used to describe its changes between momentary states. A quantifiable physical property is called physical quantity

Question 8

Isotopes

Answer 8

Isotopes are distinct nuclear species of the same chemical element. They have the same atomic number and position in the periodic table, but different nucleon numbers due to different numbers of neutrons in their nuclei

Question 9

Elements

Answer 9

A chemical element is a chemical substance whose atoms all have the same number of protons. The number of protons is called the atomic number of that element. For example, oxygen has an atomic number of 8, meaning each oxygen atom has 8 protons in its nucleus.

Question 10

Compounds

Answer 10

a thing that is composed of two or more separate elements; a mixture.

Question 11

Reactants

Answer 11

In chemistry, a reagent or analytical reagent is a substance or compound added to a system to cause a chemical reaction, or test if one occurs. The terms reactant and reagent are often used interchangeably, but reactant specifies a substance consumed in the course of a chemical reaction

Question 12

Products

Answer 12

Products are the species formed from chemical reactions. During a chemical reaction, reactants are transformed into products after passing through a high energy transition state. This process results in the consumption of the reactants

Question 13

Hydrogen Bonds

Answer 13

In chemistry, a hydrogen bond is a specific type of molecular interaction that exhibits partial covalent character and cannot be described as a purely electrostatic force.

Question 14

Covalent Bonds

Answer 14

A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs. The stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding

Question 15

Ionic Bonds

Question 16

Cation

Question 17

Anion

Question 18

Periodic Table-Groups

Question 19

Periodic Table-Rows

Question 20

Valence Electrons

Question 21

pH scale

Question 22

Acids

Question 23

bases