Elements and Compounds Flashcards
Atom
The smallest part of an element that can exist
What is an element?
A substance that cannot be broken down into simpler substances by chemical means.
What is a compound?
A substance formed when two or more elements are chemically bonded together.
True or False: Water (H2O) is a compound.
True
Fill in the blank: _____ are composed of only one type of atom.
Elements
What are the two main types of substances in chemistry?
Elements and compounds
What is the smallest unit of an element?
An atom
True or False: Compounds can be separated by physical means.
False
What do we call a mixture of two or more elements that are not chemically bonded?
A mixture
What is the main difference between an element and a compound?
An element consists of one type of atom, while a compound consists of two or more different atoms bonded together.
What is the chemical formula for carbon dioxide?
CO2
Fill in the blank: The _____ of an element is the number of protons in its nucleus.
atomic number
Which of the following is a compound? (A) Fe (B) O2 (C) H2O
C) H2O
What is the term for a substance made from two or more different elements that are chemically combined?
Compound
True or False: All compounds are made of two or more different elements.
True
What is the process called when compounds are formed?
Chemical bonding
Fill in the blank: The _____ is the basic building block of matter.
atom
Which element has the chemical symbol ‘K’?
Potassium
What is the difference between an ionic bond and a covalent bond?
An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.
True or False: Elements can exist as solids, liquids, or gases.
True
What is the chemical formula for methane?
CH4
What is a molecule?
Two or more atoms bonded together.
Fill in the blank: _____ are substances that can conduct electricity when dissolved in water.
Ionic compounds
Which of the following is a property of metals? (A) Brittle (B) Conductive (C) Non-malleable
B) Conductive
What is the term for the chemical reaction where compounds are broken down into simpler substances?
Decomposition
True or False: Oxygen is an element that supports combustion.
True
What is the chemical formula for sulfuric acid?
H2SO4
Fill in the blank: A _____ is a pure substance that cannot be separated into simpler substances by chemical means.
element
Which element has the atomic number 1?
Hydrogen
What do we call a substance that is made of only one type of atom?
Element
What is the term for the attraction between atoms that allows them to form compounds?
Chemical bond
True or False: All compounds have different properties than the elements that make them up.
True
What is the chemical formula for glucose?
C6H12O6
Fill in the blank: The _____ of a compound determines its properties.
structure
Which of the following is a property of nonmetals? (A) Good conductors of heat (B) Dull appearance (C) Malleable
B) Dull appearance
What is the primary component of air?
Nitrogen
What is an alloy?
A mixture of two or more metals.
