Chemical Reaction
What is the gas produced when magnesium reacts with hydrochloric acid?
Hydrogen Gas
How many elements are in the first period of the periodic table?
2 (Hydrogen and Helium).
What part of the body do we use to hear sound?
Ears
What do we call light bouncing off a mirror?
Reflection
What do we call a trait passed from parents to children?
Inherited trait
What type of reaction is burning wood?
Combustion
What is the symbol for oxygen?
O
Does sound travel faster in air or water?
Water.
Name one natural source of light.
Sun or Fire
Why do polar bears have thick fur?
To stay warm in cold weather
Why is the rate of reaction faster when marble chips (CaCO₃) are powdered instead of in large pieces?
Powder increases surface area, allowing more collisions between particles.
Which group contains very reactive metals like sodium and potassium?
Group 1 (Alkali metals).
What do we call a sound that is too high for humans to hear?
Ultrasound
What color is at the top of a rainbow?
Red
If a brown-eyed parent (BB) and a blue-eyed parent (bb) have a child, what eye color will the child have?
Brown
What are the starting materials in a chemical reaction called?
Reactants
What do we call the rows in the periodic table?
Periods
What is the unit for measuring how loud a sound is?
Decibels (dB)
What do we call materials that let all light pass through (like glass)?
Transparent.
What do we call it when animals sleep through winter?
Hibernation
What gas is made when vinegar mixes with baking soda?
Carbon dioxide.
Which gas in Group 18 is used in balloons?
Helium
What do we call a sound that bounces back to us (like in a cave)?
Echo
What happens to light when it passes through a prism?
It splits into colors (spectrum).
If a tall plant (TT) and a short plant (tt) have offspring, will the offspring be tall or short?
Tall