Physical and Chemical Properties
What is a physical change ?
is a type of change where the physical properties of matter change. is a type of change where the physical properties of matter change.
What is the difference between a substance and a mixture
Pure substances = contain only one type of particle. they cannot be separated into other substances by physical means.
Mixtures = Contain more than one type of particle. Can be separated into pure substances by physical means
Who is considered the father of modern atomic theory?
John Dalton
What information does the atomic number of an element provide?
The atomic number of an element indicates the number of protons in the nucleus of an atom of that element. It also determines the element's position on the periodic table.
What was the frequency that the loneliest whale on Earth sings at ?
52 hertz
Anything that results in the production of a new substance and cannot be reversed. (Fire burning a log to ash)
How would you classify salt water
Salt water is a mixture, specifically a homogeneous mixture (or solution) of salt dissolved in water.
What are the three main subatomic particles?
Identify the element with the symbol "O" and its atomic number.
The element with the symbol "O" is Oxygen, and its atomic number is 8.
What type of animal is a polar bear classified as ? Land, Marine, etc...
Marine
List two properties that can change during a chemical reaction.
Changes in reactivity with other substances (water, acid, oxygen) and combustibility (ability to catch fire), stability (how easily it breaks down.
Ex: bubbles of gas with baking soda and vinegar
formation of a precipitate
Name a physical property that can be used to separate mixtures.
specific gravity, density, melting point, boiling point and solubility
What is a scientific theory?
An idea or principle validated by scientists. that explains and predicts events.
How many atoms are present in the molecule C₆H₁₂O₆?
Whats the strongest animal on Earth (relative to body size).
Dung beetle.
Why is burning wood a chemical change ?
it leads to the formation of new substances like Carbon dioxide gas, water vapour, ash, etc.
What is the difference between an element and a compound?
What does the term "atomic mass" refer to?
Atomic mass refers to the weighted average mass of the atoms in an element, based on the relative abundance of its isotopes. It is typically expressed in atomic mass units (amu).
Compare the properties of metals and nonmetals.
What's the toughest animal in the world
Tardigrade. Extremophile.
What is the difference between an endothermic and exothermic reaction.
Describe the process of filtration and how it separates materials.
Filtration is a process that separates solid particles from a liquid or gas by using a filter (such as paper, mesh, or a porous material). The liquid or gas passes through the filter, while the solid particles are left behind.
Name one rule of the atomic theory.
All matter us composed of particles.
Atoms cannot be created, destroyed, or divided by a physical or chemical change.
Atoms of different elements bond in definite proportions to form compounds.
Explain what a chemical formula represents.
A chemical formula represents the types and numbers of atoms in a molecule of a compound. For example, H₂O represents a water molecule made up of two hydrogen atoms and one oxygen atom.
What is the strength of a grizzly bears bite in PSI (closest wins)
1,160 psi (pounds per square inch)