The number of atoms of each element is the same in both the reactants and the products.
100
A lithium atom has 3 protons, 4 neutrons, and 3 electrons. What is the atomic number of lithium?
What is 3 (protons and electrons are the same as the atomic number)
100
Atoms are composed of particles known as...
What are subatomic particles (protons, neutrons, electrons)
100
Atomic number on the periodic table refers to________________.
What is protons and electrons.
100
Is ice melting a physical or chemical change?
What is a physical change.
200
The idea that matter is neither created nor destroyed in chemical reactions is known as the:
What is the Law of Conservation of Mass or Matter.
200
Protons, neutrons, and electrons are subatomic particles in an
What is an atom.
200
Which element is located in group 1 on the periodic table?
A) K
B) He
C) B
D) Be
What is (k) Potassium.
200
An typical atom of aluminum has 13 electrons and 14 neutrons. How many protons does the atom have?
What is 13.
200
Rusting of a bicycle a physical or chemical change?
What is a chemical change.
300
In the reaction methane + oxygen yields carbon dioxide + water,methane and oxygen are called _______________.
What is a Reactant.
300
Which two types of subatomic particles are found in the nucleus of an atom?
What is protons and neutrons.
300
Chlorine (Cl) is a metal, non-metal, or metalloid?
What is a non-metal.
300
Iron has an atomic number of 26 and a mass number of 56. How many neutrons are in the nucleus of a typical iron atom?
What is 30. (56-26=30)
300
Two substances are combined together in a beaker. Which of the following observations would most likely indicate that a chemical reaction has taken place?
A) Gas bubbles are produced.
B) One substance sinks to the bottom of the beaker.
C) The two substances remain mixed together.
D) One substance dissolves in the other.
A) Gas bubbles are produced.
400
The substances that result from a reaction. Hint: What you end up with
What is a product.
400
Which is made of only one kind of atom and cannot be broken down into a simpler substance?
What is an element.
400
The horizontal rows in the periodic table are arranged according to the number of electrons in the atom's outer shell. What are these rows
called?
periods.
400
The smallest particle of an element that has the properties of that element is the
What is an atom
400
Which of the following is a chemical reaction?
A) Ice melts.
B) Water evaporates.
C) Salt dissolves in water.
D) Wood burns.
What is wood burns.
500
Look at this chemical reaction: glucose + oxygen -> carbon
dioxide + water. What are the products of this reaction?
What is Carbon Dioxide + Water
500
In a mixture of sand and rock in gravel, different components are easily observed. Which term best describes this mixture?
What is a heterogeneous mixture.
500
How are elements arranged in the periodic table?
By increasing atomic numbers.
500
The electrically neutral subatomic particle in the nucleus of an atom is the
What is the neutron.
500
What type of change occurs when a new substance is formed that has different properties from the original substances?