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Matter & Energy: Properties of Objects BROWN 14-15
Transcript of Matter & Energy: Properties of Objects BROWN 14-15
Elements are pure substances with only 1 type of atom.
Periodic Table of the Elements
A compound has 2+ types of atoms that have been chemically bonded together.
The properties of a compound are different than original properties of the atoms that were used to make it.
Ex. Table Salt: NaCl (Sodium Chloride)
- Sodium and Chloride are both very reactive.
- Table salt is quite stable.
Properties of Objects p. 10-13 & 43
It is how much matter is in something.
Measured in kg, g, mg
g = gram
mg = milligram
1000g = 1 kg
1000mg= 1 g
Tool used to measure mass is triple beam balance
Amount of downward pull on an object due to gravity.
Measured in Newtons (N)
Tool = spring scale
increase weight = increase gravitational force on object
Closer to Earth = increase weight
Pure or Mixed?
Molecules p. 18-19
A molecule is when two or more atoms bond together.
- They can be the same or different atoms
Different – water (H2O) – hydrogen & oxygen
Same – oxygen (O2) – oxygen bonded with itself
The smallest amount of a substance made of combined atoms.
- More atoms = larger molecule
- The different number of atoms determine the substance.
- The different type of atoms determines the substance.
Atoms and molecules are always in motion.
- More energy means they move more.
- Liquids and gases move more than solids.
Matter p. 9
Matter & Energy: Properties of Objects
What properties does a basketball have?
Matter & Energy: Properties of Objects
Atoms p. 16-17
An atom is the smallest and most basic unit of matter.
Atoms are the building blocks of everything.
Substances are determined by what type of atom they are made of. Also their arrangement affects what they are.
Atoms are too small to be seen.
Nearly 100 trillion atoms can be fit on the end of a pin.
Measuring the Properties
TSW generalize that matter is moving particles too small to be seen without tremendous magnification.
TSW measure the properties of matter including mass, volume, and density.
TSW distinguish materials as conductors or insulators.
TSW categorize materials as pure substances (i.e., elements, compounds) or mixtures (i.e. homogenous or heterogeneous).
states of matter
Matter is anything that has mass & takes up space
Matter can be living or nonliving
- Living: matter is found in all life on Earth (makes up cells)
- Non-living: matter is found in all non living things (water, rocks)
Matter is made of atoms.
- Have protons, neutrons, and electrons.
- The number of protons and electrons determines the element.
1. Basketball (ball and air inside)
2. Drinking water
The amount of space an object occupies.
Volume is measured with formulas or displacement.
Formula (of a rectangular prism)
V = L x W x H
Displacement --see p. 13
Units= kl, l, ml, cc
kl= kiloliter l= liter
ml= milliter cc = cubic centimeter
Tools to use: graduated cylinder, ruler, meter stick
Density is the amount of mass in a given space.
Density = mass divided by volume
Grams per cubic centimeter = g / cc - solids
Grams per milliliter = g / ml - liquids
Objects with a density less than water will float.
Objects with a density more than water will sink.
Chemistry & Physics