Mixed Questions Flashcards
What is a Hypothesis?
A possible explanation for an observation
What is Peer Review?
When other scientists check results and explanations before they are published
What is a Hazard and a Risk
A hazard is something that could potentially cause harm and a risk is the chance that a hazard will cause harm
Data should be…
Repeatable
Reproducible
Accurate
Precise
What is an Independent Variable?
Variable you change
What is a Dependent Variable?
Variable that is measured
What is a Control Variable?
Variable that is kept the same
What are Random Errors?
Unpredictable differences caused by things like human errors in measuring
What are Systematic Errors?
Measurements that are wrong by the same amount each time
What are Zero Errors?
Systematic errors that are caused by using a piece od equipment that has not been reset to zero properly
What are Anomalous Results
Results that do not fit the rest of the data
What are Elements?
Substances made up of one type of atom (with the same atomic number - number of protons)
What are Isotopes?
Atoms (of an element) with the same number of protons but different numbers of neutrons
What is Relative Atomic Mass (Ar)
The average mass number for an element.
Ar = (Isotope abundance x Isotope Mass number)
/total Abundance of all Isotopes
What is a Compound?
Substance made up of 2 or more elements CHEMICALLY bonded together in fixed proportions
What is a Molecule?
Particle made up of 2 or more non-metal atoms covalently bonded together.
Molecules can be elements or compounds.
What is a Mixture?
Substances made up of different elements or compounds that are NOT chemically bonded together.
Mixtures can be separated by physical methods.
What is Filtration?
Method for separating insoluble solids from liquids and solutions using filter paper and a funnel
What is Evaporation?
Method for separating soluble salts from a solution using an evaporating basin and heat. Evaporation is quick, but cannot be used if the solid decomposes when heated.
What is Crystallisation?
