Chemisty Flashcards
What is the atomic number of Carbon?
6
True or False: The pH scale ranges from 0 to 14.
True
Fill in the blank: The chemical formula for water is ____.
H2O
What type of bond involves the sharing of electron pairs between atoms?
Covalent bond
Which element has the symbol ‘Na’?
Sodium
What is the primary component of organic compounds?
Carbon
What is the pH of pure water at 25 degrees Celsius?
7
True or False: Ionic bonds are formed when electrons are shared.
False
What is the molecular formula for glucose?
C6H12O6
Which group in the periodic table contains noble gases?
Group 18
What is the process of a liquid turning into a gas called?
Vaporization
Fill in the blank: The chemical bond formed by the transfer of electrons is called a ____ bond.
Ionic
What is the most abundant element in the universe?
Hydrogen
What is the term for substances that cannot be broken down into simpler substances?
Elements
True or False: Acids have a pH less than 7.
True
Which compound is a common acid found in vinegar?
Acetic acid
What is the chemical formula for table salt?
NaCl
What type of reaction involves the breaking down of a compound into simpler products?
Decomposition reaction
Which particle has a positive charge?
Proton
What is the term for a mixture of two or more substances that are not chemically bonded?
Mixture
Fill in the blank: The main component of the Earth’s atmosphere is ____.
Nitrogen
What is the formula for calculating pH?
pH = -log[H+]
True or False: Water is a polar molecule.
True
What is the term for the energy required to break a bond?
Bond dissociation energy
Which of the following is an organic compound: CH4, NaCl, H2O?
CH4
What is the primary reason for the high boiling point of water?
Hydrogen bonding
What is the term for the number of protons in the nucleus of an atom?
Atomic number
Fill in the blank: The chemical formula for ammonia is ____.
NH3
What is the term for a substance that increases the concentration of hydrogen ions in a solution?
Acid
True or False: Bases have a pH greater than 7.
True
Which type of bond is the strongest?
Covalent bond
What is the primary characteristic of alkali metals?
They are highly reactive.
What is the chemical name for H2SO4?
Sulfuric acid
Fill in the blank: The process of a solid turning directly into a gas is called ____.
Sublimation
What is the term for the number of atoms in a molecule?
Molecular formula
True or False: The periodic table is organized by increasing atomic mass.
False
What is the term for a solution that resists changes in pH?
Buffer
What is the main difference between an element and a compound?
An element is a pure substance, while a compound is made of two or more elements chemically bonded.
Fill in the blank: The chemical formula for ethanol is ____.
C2H5OH
What type of reaction occurs when two or more substances combine to form a new compound?
Synthesis reaction
Which gas is produced during cellular respiration?
Carbon dioxide
What is the term for the attractive force between molecules?
Intermolecular force
True or False: Metals typically form anions.
False
What is the term for the ability of a substance to dissolve in water?
Solubility
Fill in the blank: The chemical formula for sodium bicarbonate is ____.
NaHCO3
What is the main component of the cell membrane?
Phospholipids
What is the term for the process of a liquid turning into a solid?
Freezing
Which element is found in all organic molecules?
Carbon
