ppe Flashcards
What is the chemical formula for water?
H2O
True or False: An atom consists of protons, neutrons, and electrons.
True
What is the pH range of acidic solutions?
0 to 6
Fill in the blank: The process of a solid turning into a gas without becoming liquid is called ______.
sublimation
What is the term for the amount of substance in a given volume?
concentration
Which particle has a positive charge?
proton
What is the name of the process where liquid turns into vapor?
evaporation
True or False: The atomic number of an element is determined by the number of neutrons.
False
What is the main gas produced during photosynthesis?
oxygen
What is the chemical symbol for sodium?
Na
Fill in the blank: The law of ______ states that mass is neither created nor destroyed in a chemical reaction.
conservation of mass
What type of bond involves the sharing of electron pairs between atoms?
covalent bond
What is the term for the smallest unit of a chemical compound?
molecule
Which of the following is a noble gas? a) Oxygen b) Helium c) Carbon
b) Helium
What is the process of a liquid becoming a solid called?
freezing
True or False: Acids turn blue litmus paper red.
True
What is the name of the negatively charged particle in an atom?
electron
What is the main component of natural gas?
methane
Fill in the blank: The periodic table is arranged by increasing ______.
atomic number
What is an ion?
An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
What is the formula for calculating the number of moles?
moles = mass (g) / molar mass (g/mol)
Which element is represented by the symbol ‘Fe’?
Iron
What is a catalyst?
A substance that increases the rate of a chemical reaction without undergoing permanent change.
True or False: Metals are typically good conductors of electricity.
True
What is the process of combining two or more substances to form a new substance?
chemical reaction
Fill in the blank: The ______ is the part of the atom that contains protons and neutrons.
nucleus
