Which science skills are assessed across biology, chemistry, and physics?
Biology variables, microscopes, magnification, investigation design and analysis, and graphs; chemistry apparatus, measurements, accuracy, reliability, formulae, balancing equations, and state symbols; and physics units, formulae, prefixes, rounding, and graphs.
By what factor do you multiply centimetres to convert them to millimetres?
10.
By what factor do you multiply millimetres to convert them to micrometres?
1,000.
How many millimetres equal one centimetre?
10 millimetres.
How many micrometres equal one centimetre?
10,000 micrometres.
How many micrometres equal one millimetre?
1,000 micrometres.
What formula calculates magnification from image size and actual size?
Where does the independent variable go on a graph?
On the horizontal x-axis.
When do reactants appear, and where are they written in a chemical equation?
They are present at the start and written to the left of the arrow.
What are products, and where are they written in a chemical equation?
They are new substances made in a reaction and written to the right of the arrow.
What does a subscript in a chemical formula indicate?
The number of atoms of that element in one formula unit.
How many atoms does an element without a subscript have in a formula unit?
One atom.
What does a coefficient do to atoms in the formula that follows it?
It multiplies every atom in the formula.
How many hydrogen atoms are in 2H₂O?
Four hydrogen atoms.
When is a chemical equation balanced?
It has the same number of each type of atom on both sides.
How do you balance a symbol equation?
Count each atom type on both sides, then adjust coefficients until the counts match.
What changes when balancing an equation, and what must remain unchanged?
Adjust coefficients, not subscripts, because changing a subscript changes the substance.
What does conservation of mass state about atoms during a reaction?
Atoms are not created or destroyed.
What mass relationship does conservation of mass require between reactants and products?
Their total masses are equal.
What is the first day of the two-day revision plan for?
Learning and understanding the material.
What activities make up the second day of the two-day revision plan?
Self-testing, exam-style questions, revisiting weak topics, a mixed quiz, and enough sleep.
What formula calculates image size from magnification and actual size?
What unit condition is required before calculating magnification from image and actual sizes?
Both sizes must be expressed in the same units.
What should a graph axis label include?
The measured quantity and its unit.
How should intervals be spaced on a graph scale?
Evenly.
How should experimental data points be marked on a graph?
With small, clear crosses.
What does apparatus mean in an experiment?
The equipment used.
What are experimental precautions?
Steps taken to improve safety or reliability.
What does a measuring cylinder measure?
Liquid volume.
What improves the reliability of stopwatch measurements?
Starting and stopping consistently and repeating measurements.
How is the arrow read, and what separates substances in a chemical equation?
The arrow means “react to make,” and a plus sign separates substances.
In magnesium + oxygen → magnesium oxide, which substances are reactants?
Magnesium and oxygen.
What is the word equation for a metal reacting with oxygen?
Metal + oxygen → metal oxide.
What is the word equation pattern for a metal reacting with an acid?
Metal + acid → salt + hydrogen.
What is the word equation pattern for an acid reacting with an alkali?
Acid + alkali → salt + water.
What salt does sulfuric acid form?
Sulfate salts.
Which elements are listed as diatomic?
H₂, O₂, N₂, Cl₂, F₂, Br₂, and I₂.
How many calcium atoms are in Ca(OH)₂?
One calcium atom.
How many oxygen atoms are in Ca(OH)₂?
Two oxygen atoms.
How many hydrogen atoms are in Ca(OH)₂?
Two hydrogen atoms.
What is the balanced equation for hydrogen reacting with oxygen to form water?
2H₂ + O₂ → 2H₂O.
What is the balanced equation for iron reacting with oxygen to form iron oxide?
4Fe + 3O₂ → 2Fe₂O₃.
Is CuCO₃ → CuO + CO₂ balanced without coefficients other than 1?
Yes, it is already balanced.
How much magnesium oxide forms when 2.4 g of magnesium reacts with 1.6 g of oxygen?
4.0 g.
What is a reaction called when one reactant forms two or more simpler products?
Thermal decomposition.
Which products form when calcium carbonate thermally decomposes?
Calcium oxide and carbon dioxide.
Answer 16 questions on Year 9 Science Revision Skills.
1. Which set correctly groups the assessed science skills by subject?
2. A student has learned the key ideas on day one and is planning the second day of a two-day science revision plan. What should the student do next?
Go over the full study guide for Year 9 Science Revision Skills.
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