Health & Lifestyle
What foods contain carbohydrates?
bread, rice, ...
What is the difference between a physical change and a chemical reaction?
A physical change only changes the shape or state, but the substance stays the same.
A chemical reaction creates a different substance and cannot be reversed.
What type of waves transmit sound?
longitudinal wave
What is the phenomenon called when light bounces off a mirror?
Reflection
What are the properties of group 1 metals?
Very responsive
What foods can you get protein from?
meat, eggs, ...
What are the signs that a chemical reaction has taken place?
Changes such as color, bubbles, smell, heat or light, and solid formation can happen
What is a wave called when its direction of vibration is perpendicular to its wave direction?
Transverse waves
What is the relationship between the angle of incidence and the angle of reflection?
equal
Which metal reacts violently with water?
sodium
What nutrients can you get primarily from green and yellow vegetables and fruits?
vitamin
What is the law of conservation of mass in a chemical reaction?
The total mass stays the same before and after the reaction.
Give an example of a longitudinal wave.
Sound waves
What is the phenomenon called when light bends when it enters water?
refraction
Give an example of an element from group 7
Fluorine, chlorine, bromine, etc.
What liquid can you use to check if food contains starch?
Iodine solution
How does temperature affect the rate of a chemical reaction?
Usually, a higher temperature makes the reaction happen faster
What is the function of the eardrum in the ear?
Receives sound vibrations
Does light refract when it goes from air to water?
yes
What are the elements of group 7 called?
halogen
What liquid do you use to check if something contains fat?
Ethanol solution
What are the reactants and products in this chemical equation: H₂ + O₂ → H₂O?
Reactants: H₂ (hydrogen) and O₂ (oxygen)
Product: H₂O (water)
Which part of the outer, middle, or inner ear converts sound into electrical signals?
Inner ear (cochlea)
What tool helps to understand the law of reflection?
Plane mirror
What do equal vertical columns represent in the periodic table?
A group of elements with the same properties