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Random
100

How are elements organized on the periodic table?

by increasing atomic number and similar properties.

100

Define valence electron

The outermost electrons that are used during bonding.

100

Define chemical reaction

a process in which atoms of one or more substances rearrange to form one or more new substances.

100

What are the 4 categories of matter?

Elements, compounds, homogeneous mixtures, and heterogeneous mixtures

100

What three particles makeup atoms?

Proton, Neutron, Electron

200

What is a period and group on the periodic table and give an example?

A period is a row on the periodic table.

A group is a column on the periodic table.

200

What is the difference between a covalent bond and an ionic bond?

In ionic bonds a metal gives away an electron to a nonmetal and the resulting ions are attracted to each other.

Covalent bonds are between two nonmetals and share electrons.


200

What is the name for the substances before and after the chemical reaction?

reactants and products

200

Define solute and solvent

The solvent is the substance that exists in the greatest quantity in a solution.

The solute is any other substance in the solution.

200

Why do elements want to have a full shell of valence electrons

to be chemically stable

300

Define a Semiconductor

conducts electricity at high temperatures , but not at low temperatures

300

Define metallic bond

A bond formed when many metal atoms share their pooled valence electrons.

300

What is it called when a chemical reaction releases energy?

 an exothermic reaction

300

Define pH

an inverse measure of the concentration of hydronium ions in a solution.

300

Give me an example of an acid and a base

acid: Lemon juice

Base: soap

400

What is the name of groups 17 and 18

Halogens, and Noble gases

400

Draw the electron dot diagram of Helium, Sulfer, and Magnesium.

Helium, two dots on top

Sulfer, six dots

Magnesium, two dots

400

What are the 4 types of chemical reactions?

Synthesis, Decomposition, Single replacement,and Double replacement

400

What is the difference between a saturated solution and an unsaturated solution?

Saturated solution: a solution that contains the maximum amount of solute the solution can hold at a given temperature.

Unsaturated solution: a solution that can sill dissolve more solute at a given temperature

400

Define atomic mass and average atomic mass

the sum of the atom's protons and neutrons.

The average mass of the element's isotopes, weighted according to the abundance of each isotope.

500

What are 4 common properties of metals and define them?

Ductility, ability to pull into wires

Malleability, ability to hammer into thin sheets

Luster, shinny

Conductivity, ability to conduct electricity and heat

500

What would make bromine more similar to a noble gas?

gaining one electron

500

What are four ways to decrease the reaction rate of a chemical reaction?

Decrease the temperature

Lower the concentration

decrease the surface area

add inhibitors

500

Calculate the concentration (g/L) of a container of water (300ml) with 60 g of salt.

200 g/L

500

How many bonds does a nitrogen atom form when it bonds with another nitrogen atom?

3 bonds.