Is the following a chemical or physical change: cutting a pumpkin to make jack-o-lantern
Physical
How many atoms are in 2(Ge2O3)?
10
A neutral atom with 15 protons has ______ valence electrons.
Five (5)
The number of valence electrons in an atom determines its -
chemical reactivity.
Is the following an example of potential or kinetic energy: Trevon Diggs intercepting the football
Kinetic
Is the following a chemical or physical change: acid in your stomach digesting Takis
Chemical
In an atom, where is the majority of the mass found?
In the nucleus
New substances formed during a chemical reaction are on the _____ side and are called ______
Right side; Products
What charge are the particles in the cloud that surround the nucleus of an atom?
Negative
Identify the noble gas with two valence electrons.
Helium (He)
How many elements in the following? RbNO3
3
How many valence electrons does one atom of Oxygen (O) contain?
Six (6)
Is the following a chemical or physical change: Ice melting
Physical
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 element is located in Group 15 and Period 2?
Nitrogen (N)
What is the law of conservation of mass?
Matter cannot be created or destroyed
How do you calculate the number of neutrons in an element?
Mass - Atomic Number = Neutrons
Is the following an example of potential or kinetic energy: a book sitting on a shelf
Potential
Why do noble gases have such a low reactivity?
Their outer shells of their electron clouds are full.
Which subatomic particle has the least mass?
Electron
What is found in the nucleus of an atom?
Protons and neutrons
What group contains the Noble Gases?
Group 18
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 are the three subatomic particles and their charges?
Proton: positive Neutron: neutral electron: negative
Atomic number is equal to the number of ________.
protons
Is the following a chemical or physical change: Burning logs in a fire place.
Chemical
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.
Name the elements in the equation. CO2 + H2O ? C7H8O2
Carbon, Hydrogen, and Oxygen
What are the substances on the left side of the chemical equation called?
Reactants