Science Chemistry Flashcards
(26 cards)
What is the chemical symbol for water?
H2O
True or False: The atomic number represents the number of protons in an atom.
True
Fill in the blank: The process of a solid turning directly into a gas is called __________.
sublimation
What is the pH of pure water at 25°C?
7
Which element has the atomic number 6?
Carbon
What type of bond involves the sharing of electron pairs between atoms?
Covalent bond
What is the main gas found in the Earth’s atmosphere?
Nitrogen
True or False: Anions are negatively charged ions.
True
What is the formula for calculating the molarity of a solution?
Molarity (M) = moles of solute / liters of solution
What is the term for the energy required to initiate a chemical reaction?
Activation energy
Which law states that mass is neither created nor destroyed in a chemical reaction?
Law of Conservation of Mass
Fill in the blank: The __________ is the smallest unit of an element that retains the properties of that element.
atom
What is the primary component of natural gas?
Methane (CH4)
What kind of reaction occurs when an acid reacts with a base?
Neutralization reaction
True or False: Isotopes have the same number of protons but different numbers of neutrons.
True
What is the term for the study of carbon-containing compounds?
Organic chemistry
What is the periodic table organized by?
Atomic number
What type of reaction involves the breakdown of a compound into simpler substances?
Decomposition reaction
Name the three states of matter.
Solid, liquid, gas
Fill in the blank: The __________ is the region around the nucleus where electrons are likely to be found.
electron cloud
What is the common name for the compound NaCl?
Table salt
What is the effect of temperature on the solubility of most solid solutes in water?
Increases
True or False: A catalyst increases the rate of a chemical reaction without being consumed.
True
What is the term for the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature?
Solubility
