chemical reactions
What do we call a change where a new substance is made?
A chemical reaction
What is the chemical symbol for oxygen?
O
What do we call a back-and-forth movement that creates sound?
A vibration
What is the natural source of light for Earth?
The sun
What is meant by the term “adaptation”?
An adaptation is a feature or characteristic that helps an organism survive and reproduce in its environment.
What are the starting materials in a chemical reaction called?
Reactants
What do we call the rows on the Periodic Table?
Periods
What part of the ear detects sound vibrations?
The eardrums
What do we call materials that let all light pass through them?
Transparent
Give one example of how a polar bear is adapted to its environment.
A polar bear has thick fur and a layer of fat to keep it warm in cold temperatures.
What is one clear sign that a chemical reaction has taken place?
A color change / gas produced / temperature change / new substance formed
Which group contains the noble gases?
Group 18
Does sound travel faster in air, water, or solids?
solids
What happens when light bounces off a surface
Reflection
Why would a cactus survive better than a daisy in the desert?
A cactus has adaptations like thick, waxy skin and spines to reduce water loss, allowing it to survive in dry conditions, while a daisy needs more water.
What type of reaction happens when an acid and a base are mixed together?
a neutralization reaction
What is the name of the element with the symbol Na?
Sodium
What is the name of the distance between two sound waves?
wave length
What do we call the bending of light as it passes through a different material?
Refraction
How does natural selection explain why giraffes have long necks?
Giraffes with longer necks could reach more food and were more likely to survive and reproduce, passing the trait on to their offspring over generations.
What type of chemical reaction breaks down a compound into simpler substances using heat or electricity?
A decomposition reaction.
Why do elements in the same group have similar chemical properties?
Because they have the same number of electrons in their outer she
Why can’t sound travel through space
it is a vacuum
Why does a red object look red in white light?
Because it reflects red light and absorbs all other colors.
What is the difference between inherited and environmental characteristics?
Inherited characteristics come from parents through genes (e.g. eye colour), while environmental characteristics are influenced by surroundings (e.g. scars or language)