What is the chemical formula of sodium chloride (table salt)?
Anonymous Quiz
10%
NaOH
84%
NaCl
4%
Na₂O
2%
NaHCO₃
👍1
What does the law of conservation of mass state?
Anonymous Quiz
54%
The total mass of reactants equals the total mass of products
38%
Energy cannot be created or destroyed
7%
Gas speed is inversely proportional to molar mass
1%
Heat flows from hot to cold bodies
Which phenomenon allows plants to move water from roots to leaves?
Anonymous Quiz
20%
Reverse osmosis
23%
Capillarity and surface tension
55%
Root osmotic pressure and cohesion-tension
2%
Gravity alone
Which planet rotates in a retrograde direction?
Anonymous Quiz
17%
Mars
40%
Saturn
31%
Venus
11%
Neptune
What is water photolysis?
Anonymous Quiz
7%
Breakdown of water by heat
73%
Splitting of water using light energy in photosynthesis
12%
Evaporation of water from leaves
9%
Reduction of H₂O to hydrogen
❤1
Which rock forms from the metamorphism of limestone?
Anonymous Quiz
33%
Granite
13%
Gneiss
39%
Marble
15%
Quartzite
What is an electromagnetic field?
Anonymous Quiz
22%
Gravitational force between charges
55%
A disturbance of space generated by charges and currents
4%
Surface tension of water
19%
Force field of permanent magnets
Which brain structure produces hormones?
Anonymous Quiz
9%
Hippocampus
26%
Cerebellum
63%
Pituitary gland (hypophysis)
2%
Amygdala
What is the Heisenberg uncertainty principle?
Anonymous Quiz
65%
You cannot simultaneously measure position and momentum of a particle with arbitrary precision
28%
The energy of a particle is always uncertain
5%
A particle cannot be in two states at once
2%
Light has no mass
What reagent is used to detect CO₂ in an experiment?
Anonymous Quiz
58%
Limewater (Ca(OH)₂)
28%
Hydrogen peroxide
13%
Phenolphthalein
1%
Universal indicator
What is a coral reef ecosystem?
Anonymous Quiz
11%
An underwater desert
70%
One of Earth's most biodiverse ecosystems
15%
An ecosystem devoid of vertebrates
4%
A form of mass parasitism
❤1
Which law describes the relationship between current, voltage and resistance?
Anonymous Quiz
19%
Faraday's law
71%
Ohm's law
6%
Kirchhoff's law
4%
Ampere's law
What is mitochondrial DNA?
Anonymous Quiz
16%
DNA in the cell nucleus
76%
A small circular genome in mitochondria, inherited maternally
4%
Viral DNA integrated into the genome
5%
Mitochondrial messenger RNA
❤2
What causes the aurora borealis?
Anonymous Quiz
5%
Refraction of sunlight in clouds
77%
Interaction between solar wind and Earth's magnetic field
15%
Reflection of moonlight on the atmosphere
3%
Chemical reaction between O₃ and N₂
❤2
What is alpha radioactivity?
Anonymous Quiz
2%
Emission of electrons
21%
Emission of gamma rays
70%
Emission of a helium nucleus (2 protons + 2 neutrons)
7%
Emission of neutrons
❤3