Chemistry
What is chemical equilibrium?
Chemical equilibrium refers to the state of a system in which the concentration of the reactant and the concentration of the products do not change with time, and the system does not display any further change in properties.
Which blood type is the ultimate donor and what letter symbolises it?
First blood type O
What is the unit of electrical power?
Watt (W)
What is the capital city of Canada?
Ottawa
Who invented the light bulb?
Thomas Edison
Which of these compounds is the stinkiest?
A) Ozon(O3)
B) Copper Oxide(Cu2O)
C) Hydrogen Sulfide(H2S)
D) Ammonia(NH3)
Correct answer is C
What is the function of ribosome?
synthesizes proteins
What force pulls objects toward the center of the Earth?
Gravity
What is the chemical symbol for gold?
Au
Which continent has the most countries?
Africa
Define a catalyst and an inhibitor, tell the difference between them
Catalyst is a substance that increases the rate of a reaction. It changes it by decreasing the activation energy
Inhibitor is a substance that instead slows down a reaction
What happens in the cell during interphase?
1. G1, S phase, G2 phases
2. The cell size increases, protein is synthesized, DNA replication
What is the formula for calculating force in physics?
Force = Mass × Acceleration (F = m × a)
Which is the longest river in the world?
The Nile Rive
Which day is celebrated as Earth Day?
April 22
In the balanced reaction below, silver nitrate reacted with hydrogen chloride. Find the mass of nitric acid that formed from 22.4 liters of HCL:
HCl + AgNO3 → AgCl + HNO3
Mr(H) = 1 Mr(N) = 14 Mr(O) = 16
Answer: 63
Grass - Grasshopper - Rabbit - Fox
In this food chain, if Grass had 2400kJ of energy and following the energy rule, how much does the secondary consumer get in the end?
24kJ
What kind of mirror always produces an upright and reduced image?
Convex mirror
Who was the first President of the United States?
George Washington
What was the name of the first artificial satellite sent into space?
Sputnik 1
Balance the equation below, using the oxidation number(redox) method:
S + HNO3 → SO2 + NO2 + H2O
O{-2}
H{+1}
S + 4HNO3 = SO2 + 4NO2 + 2H2O
What is the name of the process, where water comes out as vapor. Name at least two of it's functions
Transpiration.
1. Saves the plant from overheating and helps them cool down.
2. Creates a current from the root to the leaves
3. Transports minerals and water in the plant
A car travels 150 km in 3 hours. Then it travels 100 km in 2 hours. What is its average speed for the entire trip?
Average speed = Total distance ÷ Total time = (150 + 100) km ÷ (3 + 2) h = 250 ÷ 5 = 50 km/h
Who discovered the sea route to India around the Cape of Good Hope?
Vasco da Gama
What ancient civilization built Machu Picchu?
The Inca civilization