Chemical Reactions
Q: What is corrosion?
A) A rapid burning reaction of metals
B) The slow chemical reaction of a metal with oxygen and/or water forming rust
C) Dissolving a metal in acid instantly
D) A physical change in the metal’s shape
B) the slow chemical reaction of a metal with oxygen and/or water forming rust
What is the atomic number for Hydrogen?
1
What number on the pH scale is neutral?
7
What is the name of the killer whale that helped whalers in Twofold Bay near Eden, NSW?
Old Tom
What type of graph is used (mostly) in Science?
Line Graph
What is a precipitate?
A) A liquid formed when two solids react
B) A gas released in a chemical reaction
C) A solid that forms when two solutions react
D) A solution that changes colour
C) a solid that forms when two solutions react
What is the compound name for KCl?
Potassium Chloride
Is a substance with a pH of 2 an acid or a base?
Acid
What type of reaction occurs when iron is left in seawater?
Corrosion Reaction
What is the independent variable on a graph, and on which axis is it put on?
The variable that is changed and on the x-axis.
In the reaction,
acetic acid + bicarbonate → carbon dioxide + water + sodium acetate. What are the products?
Carbon Dioxide, water and sodium acetate
What does the atomic number of an element tell you?
What is the purpose of using a universal indicator in chemistry?
To show the pH of a substance by changing colour across the whole pH scale
What is one major environmental risk of deep sea mining?
A) Increases oxygen in the ocean
B) Destroys fragile marine ecosystems and releases toxic metals
C) Makes seawater drinkable
D) Reduces ocean acidity
B) Destroys fragile marine ecosystems and releases toxic metals
The variable that is measured is the _______ and is located on the y-axis
Dependent variable
Left of the arrow
protons + neutrons
A solution of has a pH of 12, is it a weak base or a strong base?
Strong Base
What gas dissolves in seawater to cause ocean acidification, and why is this harmful to marine life?
Carbon dioxide (CO₂); it lowers pH and makes it harder for organisms like corals and shellfish to form calcium carbonate shells.
Title, X-axis, Y-axis, labels, scale, data points and line of best fit.
When solutions of silver nitrate (AgNO₃) and sodium chloride (NaCl) are mixed, a white solid forms. What type of reaction is it?
A precipitation reaction
What is the formula for Silver Nitrate?
AgNO3
Why is the pH scale important in chemistry?
It measures the concentration of Hydrogen ions, helping to identify how acidic or basic a substance is.
Name one human activity that contributes to ocean acidification.
Burning fossil fuels OR deforestation OR industrial processes.
A student collects data on temperature every hour for 12 hours. What graph should they use, and what variables would be put on the x-axis and the y-axis?
A Line Graph with time on the x-axis and temperature on the y-axis