Atoms and Elements
What is the atomic mass of the element Krypton?
84.80 amu
Is Oxygen O2 and example of a compound? Why or Why not?
No. Oxygen is not a compound because it is composed of only one type of particle.
What holds two atoms of oxygen in the molecule O2 together?
Chemical bonds are an invisible force that holds atoms of a molecule together.
Define Matter
Matter is anything that has mass and takes up space.
Is it a pure substance or mixture?
1.Air
2. Water vapor
3. Salt water
Air is a mixture.
Water vapor is a pure substance.
Salt water is a mixture.
Substance: Iron (Fe)
Nathan has a pile of iron flakes.
Is Iron made of atoms?
Yes, Iron is made of atoms
How do you represent a compound? A chemical symbol or a chemical formula?
A chemical formula
Fill in the Blank
When chemical bonds are broken; a __________ ____________ takes place which results in a new and different substance.
Chemical Reaction
Is gold a pure substance or mixture?
Gold is a pure substance
How do you know that two elements will have similar chemical and physical properties?
The elements will be in the same group or column on the periodic table of elements.
Salt (NaCl)
Sally has a pile of salt.
Is salt made of atoms?
Is salt made of molecules or elements?
Is salt a compound?
Yes, salt is made of atoms
Salt is made of elements not molecules.
Yes, salt is a compound
What is the result of a chemical reaction with sodium and chloride?
What is the chemical formula?
The chemical reaction makes table salt - NaCl
What does a crystalline structure look like?
An organzied, repeating pattern of atoms
True or False?
A compound is a pure substance?
True. A compound is a pure substance. (Ex. Water, H20)
How do you determine the
volume of the fish?
What is the volume of
the fish?
Use water displacement to get the volume of the fish. The volume of the fish is
6 ml or 6 cm3.
Water (H2O)
Bill has a beaker full of water.
Is water made of atoms?
Is water made of molecules?
Is water an element?
Is water a compound?
Yes, water is made of atoms
Yes, water is made of
molecules.
No, water is not an element
Yes, water is a compound
True or False?
A compound can be physically separated?
False, a compound cannot be physically separated.
Glass does not have an atomic pattern or structure that repeats. What kind of structure is a random arrangement of atoms?
Amorphous
Is it Matter or Not?
1. Smog
2. Rainbow
Smog is matter
A rainbow is not matter.
Would objects be heavier on Earth or Mars? Why?
Objects would be heavier on Earth because Earth is more massive than Mars and therefore has more gravitational pull.
Iron (Fe)
Salt (NaCl)
Ryan has an Iron and Salt mixture.
Is the mixture made of atoms?
Is the mixture made of molecules?
Is the mixture an element?
Is the mixture a compound?
Is the mixture a pure substance?
Yes, Iron and salt are made of atoms.
No, mixture is not made of molecules.
No, the mixture is not an element.
No, the mixture is not a compound or pure substance.
Element or Compound?
Hydrogen (H2)
Carbon Dioxide (CO2)
Water (H2O)
Sodium (Na)
Radon (Rn)
Oxygen (O2)
Iron is an element
Carbon Dioxide is a compound
Water is a compound
Element
Element
Element
Polyethylene is made of carbon and hydrogen atoms.
Polyethylene is a strong, flexible substance used to make plastic bags. Why do you think polyethylene has its particular properties.
The reason it has the properties of flexibility and strength are the arrangement of carbon and hydrogen atoms in the molecule.
Is it Matter or Not?
Helium
Air
Light
dirt
Yes, Helium is matter
Yes, air is matter
No, light is energy not matter
Yes, dirt is matter
Refer to google slides (slide 50)
Cube B is twice as dense as Cube A.