#1
Which chemical element is the primary component of natural gas?
Hydrogen
ExplanationNatural gas primarily consists of hydrogen.
#2
What is the chemical formula for table salt?
NaCl
ExplanationTable salt's chemical formula is NaCl.
#3
Which gas is commonly known as laughing gas?
Nitrous oxide
ExplanationNitrous oxide is commonly known as laughing gas.
#4
What is the chemical symbol for gold?
Au
ExplanationThe chemical symbol for gold is Au.
#5
Which of the following is a noble gas?
Helium
ExplanationHelium is a noble gas.
#6
Which of the following compounds is responsible for the greenhouse effect?
Carbon dioxide
ExplanationCarbon dioxide is a greenhouse gas.
#7
What is the process called when a solid changes directly into a gas without becoming a liquid first?
Sublimation
ExplanationSublimation is the process of solid to gas transition without becoming a liquid.
#8
Which chemical element has the highest melting point?
Tungsten
ExplanationTungsten has the highest melting point among chemical elements.
#9
What is the chemical formula for water?
H2O
ExplanationThe chemical formula for water is H2O.
#10
Which chemical compound is commonly known as baking soda?
Sodium bicarbonate
ExplanationBaking soda is commonly known as sodium bicarbonate.
#11
Which scientist discovered the radioactive element radium?
Marie Curie
ExplanationRadium was discovered by Marie Curie.
#12
Which gas makes up the majority of Earth's atmosphere?
Nitrogen
ExplanationNitrogen makes up the majority of Earth's atmosphere.
#13
Which element has the highest atomic number?
Oganesson
ExplanationOganesson has the highest atomic number.
#14
Which of the following is a transition metal?
Copper
ExplanationCopper is a transition metal.
#15
Which of the following is an allotrope of carbon?
Graphite
ExplanationGraphite is an allotrope of carbon.