Periodic table.
What's the lightest element on the periodic table?
Hydrogen.
2, 8.
Identify 3 different signs which indicate that a chemical reaction has occurred.
Answers may include:
-Production of a gas.
-Light &/or heat produced.
-A new substance is produced.
-A change in colour.
What's the other term for a base?
Alkali.
Which scientist is most famously known for the equation E= MC2?
Albert Einstein.
The atomic number of an element represents what?
The number of protons it contains.
What are the 2 main types of chemical bonds which exist on Earth?
Ionic & covalent.
Why do chemical equations need to be balanced?
Because matter can't be created or destroyed - it simply changes forms (the law of the conservation of mass).
What colour will red litmus paper turn if it's placed into a basic solution?
Blue.
How long does it take the Earth to complete 1 full rotation?
How long does it take for Earth to complete 1 full lap around the Sun?
24 hours for 1 rotation.
365 days for 1 lap of the Sun.
What are the majority of elements in the periodic table classified as?
Metals.
Provide 1 example of an ionic & covalent bond.
Answers may include:
-Ionic bond: table salt (NaCl).
-Covalent bond: water (H2O).
How many Hydrogen atoms are found in the below chemical equation?
2(C6H12O6)
24.
What type of subatomic particle do acids donate lots of?
Protons (positively-charged Hydrogen ions).
Which famous primatologist (a scientist who works with & studies primates) passed away within the last month?
(Dame) Jane Goodall.
What's the difference between groups & periods on the periodic table?
Periods are the horizontal rows, whilst groups are the vertical columns.
Outline the major difference between ionic & covalent bonding.
Answers may include:
-Ionic bonding involves a metal & a non-metal, whereas covalent bonds involve non-metals.
-Ionic bonding involves the donation of electrons, whereas covalent bonding involves the sharing of electrons.
What's the name for the number that sits below an element in a chemical equation? (e.g. CH4)
Subscript.
Which element (seen on the periodic table) do all acids have in common with one another?
Hydrogen.
Identify the inputs (reactants) & outputs (products) of the process of Photosynthesis.
Inputs: H2O, CO2 & sunlight.
Outputs: O2 & Glucose (C6H12O6).
List at least 3 key properties of non-metals.
-Poor conductors of heat & electricity.
-Not malleable or ductile (i.e. brittle).
-Have relatively low melting & boiling points.
What are the scientific terms for a positively & negatively-charged ion?
Positively-charged ion: cation.
Negatively-charged ion: anion.
Why is an arrow (not an equals sign) used in a chemical equation?
To indicate that the reactants are transformed into the products (i.e. they don't equal one another).
Why are the majority of cleaning products (e.g. soap, drain cleaner, dishwashing detergent, etc.) basic? What does this enable them to do?
This allows them to cut through grease & grime by breaking it down.
What does DNA stand for?
Deoxyribonucleic acid.