Vocab
Atom
What is The smallest particle of an element; made of electrons, protons, and neutrons.
Reactant
What is A substance that takes part in and undergoes change during a chemical reaction
In a chemical process, atoms that make up a substance are regrouped into different _______ to form new substances with different properties.
What is Molecules
What are some physical properties you know?
What is color, density, boiling point, state of matter, luster, etc.
Hydrogen and oxygen react to form water. At an atomic level, how do we know that a chemical reaction has occurred?
What is The hydrogen and oxygen atoms regroup into a new molecule.
Table salt is a compound made from these two elements
What are sodium and chlorine?
Chemical Process
What is Method or means of changing one or more
chemicals or chemical compounds
Properties
What is Physical and chemical characteristics of matter used to describe or identify a substance
A _______increase or decrease and the production of light are both signs that a chemical reaction may have occurred.
What is temperature?
What are some chemical properties you know?
What is Flammable, reactive with water, reactive with…
Which of the following is the best description of the results of a chemical reaction?
What is A new substance with different properties is formed.
The horizontal rows on the periodic table are called this
What are periods?
Chemical Reaction
What is The process by which one or more substances
change to produce one or more different
substances
Product
What is A substance produced during a chemical reaction
A _______is a solid substance that forms and separates from a solution and may indicate that a chemical reaction has occurred.
What is precipitate?
What is the difference between a physical and chemical change?
What is In a physical change, no new substance is created and the process is generally easily reversible. An example is ice melting. In a chemical change, a new substance is created with different properties. The substances that react are called the reactants, and the substances that are produced are called the products. It is generally more difficult to reverse a chemical reaction.
Rust forming on a piece of iron is an example of which of the following:
What is A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms
The layer of Earth we live on
What is the crust?
Compound
What is A new substance with unique chemical
and physical properties formed when two or more
elements are chemically bonded during a chemical
reaction
Synthetic Materials
What is Materials made from one or more natural
substances that undergo a chemical process
An unexpected change in _______is a sign that a chemical reaction may have occurred.
What is color?
How are fireworks an example of chemical reactions?
What is Heat, light, and sound
When a chocolate bar melts, the chemical properties of that substance are _________
What is the same?
These organelles are known as the "Powerhouse" of the cell
What are mitochondria?
Molecule
What is The simplest unit of a chemical compound that can exist, formed when two or more atoms join
together chemically
Pure Substance
What is A single substance, either an element or a
compound, with definite composition and
properties
Substances giving off a smell, or ________, while being combined is also an indicator of a chemical reaction
What is Odor?
Sodium and chlorine react to form salt. How do we know a chemical reaction has taken place at the atomic level?
What is Sodium and Chlorine regroup to form a new molecule
This type of energy change happens if a chemical reaction feels hot to the touch.
What is Exothermic reaction?
The force that pulls objects towards Earth
What is gravity?
Precipitate
What is An insoluble solid formed from a chemical reaction
properties
What is physical and chemical characteristics of matter used to describe or identify a substance
What is a chemical reaction?
What is a process where the bonds between atoms are broken and a new arrangement of bonds between different atoms is formed.
Why is a saltwater solution only a physical change?
What is the salt atoms and water atoms do not recombine to make a new substance?
The law of Conservation of matter
What is matter can not be created or destroyed
The sun produces energy through this process
What is nuclear fusion?