chemical reactions
What do we call something that helps a reaction happen faster?
Catalyst
What do we use to measure how loud something is?
Decibel
What is the main natural source of light?
The sun
What food group gives us most of our energy?
Carbohydrates
What do we call the columns on the periodic table?
Groups
What kind of reaction gives off heat?
Exothermic reaction
What part of your ear helps you hear sounds?
Cochlea
What do we call it when light bounces off something?
Reflection
How many hours of sleep should kids 12-14 get?
8-10 hours
What do elements in the same group have in common?
They have similar properties
What do you get when hydrogen reacts with oxygen?
Water
What is the word for how high or low a sound is?
Pitch
What is it called when light bends in water or glass?
Refraction
What does BMI stand for?
Body Mass Index
Which group contains elements that are very reactive metals like sodium and potassium?
Group 1
What type of reaction happens when a fuel burns in oxygen to release energy?
Combustion reaction
Why does sound move faster in metal than in air?
Because the particles are closer together
What are the three main colours of light?
Red green blue
What happens if you eat too much sugar?
You might gain weight or feel tired
What happens to the reactivity of group 1 elements as you go down the group?
It increases
How do you know which chemical runs out first in a reaction?
It makes the smallest amount of product
What is it called when a sound changes because something is moving?
Doppler effect
Why does a red apple look red?
Why does a red apple look red?
How does running or swimming help your heart?
It makes it stronger and healthier
Why are group 7 elements (halogens) less reactive as you go down the group?
Because it’s harder for bigger atoms to gain an electron