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Atoms, Periodic Table, and Chemical Reactions
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In a neutral atom, the number of protons is _____ compared to the number of electrons.
In a neutral atom, the number of protons is equal to the number of electrons.
How do you calculate the number of neutrons in an element?
Mass - Atomic Number = Neutrons
What are the substances on the left side of the chemical equation called?
Reactants
Identify the noble gas with two valence electrons.
Helium (He)
In an atom, where is the majority of the mass found?
In the nucleus
Is the following an example of potential or kinetic energy: Trevon Diggs intercepting the football
Kinetic
Is the following an example of potential or kinetic energy: a book sitting on a shelf
Potential
Is the following a chemical or physical change: acid in your stomach digesting Takis
Chemical
Is the following a chemical or physical change: Ice melting
Physical
Is the following a chemical or physical change: cutting a pumpkin to make jack-o-lantern
Physical
Is the following a chemical or physical change: Burning logs in a fire place.
Chemical
During a tug-of-war competition, neither team is able to gain an advantage. What is true about the forces?
The forces are balanced
What is the law of conservation of mass?
Matter cannot be created or destroyed
New substances formed during a chemical reaction are on the _____ side and are called ______
Right side; Products
How many elements in the following? RbNO3
3
Name the elements in the equation. CO2 + H2O ? C7H8O2
Carbon, Hydrogen, and Oxygen
How many atoms are in 2(Ge2O3)?
10
What element is located in Group 15 and Period 2?
Nitrogen (N)
Why do noble gases have such a low reactivity?
Their outer shells of their electron clouds are full.
What group contains the Noble Gases?
Group 18
How many valence electrons does one atom of Oxygen (O) contain?
Six (6)
Which subatomic particle has the least mass?
Electron
What are the three subatomic particles and their charges?
Proton: positive Neutron: neutral electron: negative
What is found in the nucleus of an atom?
Protons and neutrons
The number of valence electrons in an atom determines its -
chemical reactivity.
Atomic number is equal to the number of ________.
protons
A neutral atom with 15 protons has ______ valence electrons.
Five (5)
A certain element has 12 neutrons and 11 protons. Assume this element has an overall neutral charge. What is the identity of this element?
Sodium (Na)
What charge are the particles in the cloud that surround the nucleus of an atom?
Negative


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