Periodic table
Which group contains highly reactive metals like sodium and potassium?
1
What type of electric charge do electrons have?
Negative
What gas do animals breathe in to use for aerobic respiration?
Oxygen
What state of matter are almost all metals at room temperature?
Solid
What scientific term describes the differences in characteristics between individuals of the same species?
Variation
What is the chemical symbol for the element iron?
Fe
What instrument is used to measure electric current in a circuit?
Ammeter
Which organ in the human body pumps blood through the circulatory system?
Heart
What property describes a metal that can be easily hammered or rolled into thin sheets?
Malleable
What type of variation causes distinct, separate categories like blood group or eye colour?
Discontinuous
What term describes elements like silicon that share properties of both metals and non-metals?
Metalloid
What metal is most commonly used for electrical wiring because it is an excellent conductor?
Copper
Which plant cell organelle absorbs sunlight to carry out photosynthesis?
Chloroplast
What is the name of a mixture made by melting two or more metals together?
Alloy
What shape describes the unique structure of a DNA molecule?
Double helix
What is the name of the group 7 elements that include fluorine and chlorine?
Halogens
What name is given to a magnet made by wrapping a coil of wire around an iron core?
Electromagnet
What gas is the main waste product of aerobic respiration?
Carbon dioxide
What chemical reaction occurs when iron reacts with oxygen and water, causing it to degrade?
Oxidation (Rusting)
What remains of ancient organisms are found preserved in rocks?
Fossils
What name is given to the rows running horizontally across the periodic table?
Periods
What unit is used to measure electrical resistance?
Ohm
What specific type of respiration occurs without oxygen during intense exercise?
Anaerobic
What substance is formed when a metal reacts with an acid?
Salt
What process did Charles Darwin propose to explain how evolution occurs?
Natural selection