What is chemistry?
This piece of equipment is used to measure the volume of a liquid accurately.
What is a measuring cylinder?
This element is found in all organic molecules.
What is carbon?
A battery converts this type of energy into electrical energy.
What is chemical energy?
In the Elephant's Toothpaste demonstration, hydrogen peroxide (H2O2) decomposes to form water and this gas.
What is oxygen?
A variable that is deliberately changed by the scientist is called this.
What is the independent variable?
This separation technique separates an insoluble solid from a liquid.
What is filtration?
The pH of a neutral solution is this number.
What is 7?
In the reactivity series, which metal is more reactive: magnesium or copper?
What is magnesium?
The loud "pop" heard during the exploding hydrogen bubbles demonstration is caused by the rapid combustion of hydrogen with this gas from the air.
Repeating an experiment several times improves this aspect of the investigation.
What is reliability?
This separation technique separates a dissolved solid from a solution by removing the solvent.
What is evaporation?
A solution with a pH of 3 would show what colour with universal indicator?
What is orange/red?
A more reactive metal will usually do this to a less reactive metal in a displacement reaction.
What is displace it?
In the Flame Test demonstration, different metal ions produce different flame colours because their electrons absorb and release different amounts of ________.
What is energy?/ Light energy
An investigation is testing whether temperature affects reaction rate. The student changes both the temperature and the concentration of the reactants. Why is the investigation not valid?
What is more than one variable was changed?
In the Bohr model, these particles orbit the nucleus.
What are electrons?
This process releases energy from glucose in living cells.
What is cellular respiration?
This metal is commonly used as the negative electrode in many simple batteries because it is relatively reactive.
What is zinc?
In the Chameleon Reaction, the solution changes colour because manganese exists in several different __________.
What are oxidation state/numbers?
A student is investigating whether temperature affects reaction rate. They accidentally use different masses of reactant in each trial. Which aspect of the investigation has been reduced?
What is validity?
When ice melts what type of change is occurring?
What is a physical change?
Name all four major biological molecule groups studied in this unit.
What are carbohydrates, proteins, lipids, or nucleic acids?
Why does a battery eventually stop working?
What is the reactants are used up / the chemical reaction can no longer continue?
The potassium permanganate and glycerol reaction did not ignite immediately. Why was there a delay before the flame appeared?
What is the reaction needed time to generate enough heat for ignition?
A student uses a measuring cylinder to measure 25 mL of water. They read the volume from above the measuring cylinder instead of at eye level.
What is the source of error?
What is a parallax error?