Chemical reactions
What is a sign that a chemical reaction has occurred?
Change in color, temperature or if a new substance forms.
What does the group number tell you?
The number of electrons in the outer shell
How does sound travel
As vibrations through a medium
What causes a shadow?
An object blocking light
What is an adaption?
A feature that helps an organism survive in its environment.
What is the word equation for the reaction of magnesium and hydrochloric acid?
Magnesium + Hydrochloric acid → Magnesium chloride + Hydrogen
Which group are the noble gases in?
Group 0
What unit is used to measure frequency?
Hertz (Hz)
What happens when light enters a different medium?
It refracts (bends)
Give an example of an inherited characteristic.
Blood group, eye color, hair type, skin color and more
What is an exothermic reaction
A reaction that releases heat to the surroundings
Why are alkali metals so reactive?
They have one electron in their outer shell.
What's the difference between pitch and volume
Pitch is how high or low a sound is, volume is how high or quiet the sound is.
What is the spectrum of visible light?
Red,Orange,Yellow,Green,Blue,Indigo,Violet
Why do some animals survive better than others in the wild?
Because of natural selection- animals with helpful traits are more likely to survive and have babies.
What is the role of a catalyst?
What is a period in the periodic table?
a row of elements
Why does sound travel faster in solids than in gases?
Particles are closer together in solids.
How do we see objects?
Light reflects off them and enters our eyes.
What is the difference between inherited and environmental variation?
Inherited is from parents, environmental is from the surroundings and the environment.
What is a neutralization reaction?
An acid reacting with a base to form salt and water.
Name a transition metal and a property it has
Iron- it is strong and magnetic
What is an echo?
A reflected sound wave
What is dispersion?
Splitting of white light into its colors.
What is selective breeding?
It’s when people pick animals or plants with the best features and let them have babies, so the babies also get those good features.