Photosynthesis
What do plants use to make photosynthesis? Be specific with your answer.
Water (from the soil)
Carbon dioxide (from the air)
Energy (from sunlight)
What is the symbol for carbon?
C
Where are elements arranged?
Periodic table
What is the scientific meaning of the word volume?
The amount of space that a substance or object occupies
What does loudness depend on?
How much the object is vibrating. The greater the distance of each vibration, the louder the sound.
How far away the object is. The further away the quieter it sounds.
Why do plants need magnesium?
What is the role of decomposers?
They break down waste products from decaying plants and animals. As they do so, they release carbon dioxide in the air.
Protons: positive charge
Electrons: Negative charge
Neutrons: No charge
What do we mean when we say an object is hollow?
What is the piece of equipment we use to measure sound waves?
Oscilloscope.
What is the function of chlorophyll? Where do we find it?
Chlorophyll captures energy from the sunlight. We find it in chloroplasts.
Explain the formation of fossil fuels.
When decaying organisms fall into areas where there is no oxygen, such as the deep ocean, they can't be regularly broken down because decomposers cannot respire without oxygen. Instead, the organisms' bodies get gradually buried and more sediments build on top of them. Because of high pressure and heat modify their remains into fossil fuels, such as coal, oil and natural gas.
How did Niels Bohr develop Rutherford's model of the atom?
What is the difference between a polystyrene container and nails?
Density.
The effect that is produced when the waves meet each other is called :
interference
What part of the plants has the most chloroplasts?
Leaves.
When we burn fossil fuels, the carbon in it reacts with the oxygen in the air forming carbon dioxide.
Combustion
What is an ionic bond? Give an example.
Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions.
Example: sodium + chlorine = Sodium Chloride (NaCl)
How do we calculate density?
density: mass/volume
What does a frequency of 500 Hz mean?
It means that 500 complete vibrations happen every second.
What are the reactants and products of photosynthesis? (Respiration equation)
water + carbon dioxide -> glucose + oxygen
Example: Hydrogen and chlorine = hydrogen chlorine molecule
Do gases have lower or higher density than solids and liquids? Why?
Lower. Because the particles in a gas are far apart.
True or false:
The trough is the wave's maximum positive amplitude.
It's the wave's maximum NEGATIVE amplitude.