What is Science?
Science is the _____ for _______. It is derived from Latin - means to ______.
Science is the search for knowledge. It is derived from Latin - means to know.
Matter is defined as: __________
Anything that occupies space and has mass.
All matter, regardless of whether it is liquid, solid, or gas, can be classified as either ________ or ______.
homogeneous or heterogeneous.
Who is the periodic table of elements made by?
Mendeleev
The letters in the periodic table are called ______.
chemical symbols
_____ is the study of living things. _____ is the study of matter. _______ is the study of energy and matter.
Biology, Chemistry, Physics
What is a solid, liquid, and gas? (In terms of volume and shape)
Solid: definite volume, definite shape
Liquid: definite volume, indefinite shape
Gas: indefinite volume, indefinite shape
Define homogeneous and heterogeneous.
Homogeneous: uniform throughout, even under a microscope.
Heterogeneous: not uniform throughout but can see is made up of different component (more than one).
Carothers was a science who studied what? And why?
Silk (a natural material) because silk is one of the strongest natural fibres.
The following chemical symbols represent which elements:
Na
Fe
Cl
K
Na: Sodium
Fe: Iron
Cl: Chlorine
K: Potassium
These qualities make a good scientist.
Observant, patient, imaginative, inventive, dedicated, passionate, detail-oriented.
What is a physical change and a chemical change?
Physical change: A change in state BUT substance is still the same.
Chemical change: A new and different substance is formed (is no longer what it was)Define pure substance and define solution.
Pure substance: only one component so this matter has the same properties and behaviour throughout.
Solution: is made up of more than one substance but one has dissolved into the other to make it appear uniform.
All matter is made up of _____. What is an ____?
Atoms.
An atom is the simplest, microscopic structure of all matter around us.
What is the number above the element symbols in the periodic table called and what does it represent?
Atomic numbers, and it represents the number of protons in an element. You can also find the number of electrons from the same number.
What is pure science and applied science?
Pure science is to search for knowledge simply for the sake of knowing.
Applied science is to search for knowledge and apply this and find uses to what they discover.Give an example of a physical change and chemical change. Give an explanation.
Answers vary.
Physical: sawing wood
Chemical: burning wood
The 2 components of a solution are ____ and ____. Define them.
Solute and Solvent.
The solute dissolves into the solvent.
What are the components that make up an atom and what are their charges?
proton: positive
neutron: neutral
electron: negative
How many neutrons are in the following atoms:
Ne
P
Mg
Neutrons: # of proton = # of mass
Ne:20-10=10
P: 31-15= 16
Mg: 24-12=12
Name an example of pure science and applied science.
Answers vary.
Pure science: astronomy
Applied science: geology
Name 4 possible changes of state and what they are called.
Any of the 6:
solid to liquid: melting
solid to gas: sublimation
liquid to gas: evaporation
liquid to solid: freezing
gas to liquid: condensation
gas to solid: sublimation
Classify this as heterogeneous or homogeneous:
sand
granola
coffee
graphite
heterogeneous
heterogeneous
homogeneous
homogeneous
Who are some famous chemists you have heard of?(From your class notes)
John Dalton: studied interaction of others
Louis Pasteur: made vaccines for rabies
Alfred Nobel: invented dynamite
Michael Farady: worked with electricity
Marie Curie: researched radioactivity
How many protons and neutrons do the following atoms have?
Mn
Ar
Au
He
Mn: 25, 30
Ar: 18, 22
Au: 79, 118
He: 2, 2