Gases & States of Matter
6 reference items
Which gas is the lightest chemical element in the universe?
A
Hydrogen
Explanation
Hydrogen (H) is the lightest and most abundant chemical substance in the cosmos.
Which noble gas is commonly used in balloons due to its low density?
A
Helium
Explanation
Helium is a non-reactive noble gas that is lighter than air, making balloons float.
Which gas is released by green plants during the process of photosynthesis?
A
Oxygen
Explanation
Plants take in carbon dioxide and release oxygen as a byproduct of photosynthesis.
Which greenhouse gas is primarily produced by animal respiration and burning fuel?
A
Carbon Dioxide
Explanation
Carbon dioxide (CO2) is a key greenhouse gas vital for the global carbon cycle.
What is the state of matter consisting of highly ionized gas called?
A
Plasma
Explanation
Plasma is the fourth state of matter, common in stars and lightning bolts.
What is the process where a solid turns directly into a gas called?
A
Sublimation
Explanation
Sublimation occurs when a solid (like dry ice) bypasses the liquid state entirely.