General Science Flashcards
7 cards from real Picat practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 General Science flashcards as text
What is the atomic number of carbon?
Answer: 6
Carbon has 6 protons in its nucleus, giving it an atomic number of 6.
Which type of chemical bond involves the sharing of electrons between atoms?
Answer: Covalent bond
Covalent bonds form when two atoms share one or more pairs of electrons.
What is the pH value of a neutral solution at room temperature?
Answer: 7
Pure water and neutral solutions have a pH of 7, where hydrogen and hydroxide ion concentrations are equal.
Which state of matter has a definite volume but no definite shape?
Answer: Liquid
Liquids have a fixed volume but take the shape of their container because their particles can flow past each other.
Which element is the most abundant in Earth's atmosphere?
Answer: Nitrogen
Nitrogen (N₂) makes up approximately 78% of Earth's atmosphere by volume.
What is the process by which a solid changes directly into a gas without passing through the liquid phase?
Answer: Sublimation
Sublimation occurs when a solid converts directly to a gas; dry ice (solid CO₂) is a common example.
What is the chemical symbol for sodium?
Answer: Na
Sodium's symbol Na comes from the Latin word 'Natrium.'