Condensation is the change of a substance from gas to liquid via cooling. Vaporization is the change of a substance from liquid to gas, either by evaporation or boiling.
What is an element? What is a compound? How is this different from a mixture?
An element is matter in its simplest form. It cannot be broken down further into other substances. Examples of an element would be O2 or even He. O2 is made up of only oxygen and He is made up of only helium. A compound is a chemically bonded element which can be broken apart chemically- such as H20, CO2 and HCl. A mixture are substances that are PHYSICALLY combined and can, for the most part, be easily separated.
What are the tiniest particles that make up all matter?
We call these tiny particles atoms- one atom is made up of different parts, such as the proton, neutron and electron.
How is the periodic table laid out?
In terms of reactivity, the more reactive an element is, the more towards the left it is. Metals tend to be extremely good conductors of electricity because of their reactivity.
Where would you find the most reactive metals? Why would elements in group 13 and 14 be used to cover wires made out of metal?
The most reactive METALS are found in groups 1 and 2. Many times, wires are made out of transition metals because while they are excellent conductors of electricity, they're less reactive and are very ductile. Elements (metalloids) in groups 13 and 14 would be good INSULATORS because, when mixed with other elements, their reactivity is rather low.
The atomic number is 6.
What is this elements name?
The elemental name is Carbon.
What period would you find this element?
Carbon is in period 2. (Remember periods go across the table)
What group would you find this element?
Carbon is in group 14. (Remember groups go up and down the table)
How many valence electrons does it have?
Carbon has 4 valence electrons. Groups 1 and 2 have 1 and 2 valence electrons, respectively. Groups 13-18 have valence electrons that are equal to their group number - 10. (3-8, respectively.)
How many protons does it have?
Carbon has 6 protons, because it has an atomic number of 6.
How many electrons does it have?
Carbon has 6 electrons, because it has an atomic number of 6.
What is its mass number?
Carbon's mass number is 12.01
The periodic table is separated into three major sections: the metals, the metalloids and the nonmetals. Remember to draw in your staircase that runs between the metalloids and separates the metals and the nonmetals on your periodic table.
What are the names for each group of the periodic table?
Group 1- Alkali metals
Group 2- Alkaline earth metals
Group 3-12- Transition metals
Group under the transition metals- Lanthanides and Actinides
Group 13- Boron Family
Group 14- Carbon Family
Group 15- Nitrogen Family
Group 16- Oxygen Family
Group 17- Halogens
Group 18- Noble Gases
What is the formula for density?
DENSITY = Mass divided by Volume
Using the formula, What is the density of an object that has a mass of 50g and a volume of 20mL?
Density = 50g divided by 20mL = 2.5 g/mL (carry your units!!)
What is the density of an object that has a mass of 25g and a volume of 2cm3?
Density = 25g divided by 2cm^3 = 12.5 g/cm^3 (carry your units!!)
These are densities of liquids:
Liquid A= 2.3g/cm^3
Liquid B= 0.89g/cm^3
Liquid C= 1.00g/cm^3
Liquid D= 1.21g/cm^3
If we were to put all these liquids into a beaker, list the order from bottom to top, of how the liquids would settle.
From bottom to top: Liquid A, Liquid D, Liquid C and Liquid B
If you dropped an object that was 1.5g/cm3, between what layers would it come to rest?
Given that the density is 1.5g/cm^3, the object would come to rest on top of Liquid A and under Liquid D.
This element is in group 2, period 7
This element is an alkali metal in period 2
This element has 27 protons
This element has 8 valence electrons and is in period 4