All chemical equations must be balanced. Which law do balanced equations represent?
What is Law of Conservation of Mass
100
An electron has a charge and a much less mass than a proton.
What is negative?
100
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atoms nucleus?
What is +25
100
On the left side of a chemical equation you have these and on the right you have this.
What are reactants and products?
100
Which of these equations shows rust, Fe2o3, forming when oxygen, 02, reacts with iron Fe?
A. 2Fe2o3->3O2+4Fe
B. 4Fe-> 3O2+2Fe2O3
C. 3O2+4Fe-> n2Fe2O3
What is C
200
This word means that a substance can be pounded into thin sheets.
What is Malleable?
200
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
What is the number of valence electrons
200
Elements found in the same group have this in common.
What are chemical properties because of the same number of valence electrons
200
This is the number of atoms contained in the following equation
C6 H12 O6
How many oxygen atoms are there?
What is 24 different atoms and 6?
200
What are the 5 signs a chemical reaction has occurred?
What is color change, temperature change, gas production, light production, precipitate is formed?
300
This property make metals suitable for use in electrical wiring.
What is ductility?
300
The an element is in represents the number of energy levels that element has.
What is period?
300
The atomic number of a substance can tell us two things about the atomic structure of that element.
What is the number of protons and electrons?
300
A chemical reaction produces two new substances each weighing 25 grams. What is the total mass of the reactants.
What is 50 grams?
300
H
H C H
H
What would the formula look like for this molecule of Methane?
What is CH4
400
In a chemical equation, the tells you the number of molecules of each reactant used and the number of molecules of each product made.
What is coefficients and or subscripts?
400
The number on the periodic table represents the number of electrons an element has, and also represents reactivity.
What is group and valence?
400
This group of elements is located in a zigzag line toward the right side of the perodic table and have characteristics of metals and nonmetals.
What are metalloids?
400
If the reactants contain 12 carbon atoms and 4 oxygen atoms, how many of each will there be in the product?
What is the products must contain 12 carbon atoms and 4 oxygen atoms?
400
All organic compounds have what element in them?
What is Carbon?
500
What does the arrow represent in a chemical equation?
What is yields?
500
Bob tries to disprove this law by burning a log. He weighs the log before he burns it and it has a mass of 25 grams. After burning the log, he weighs the ashes and finds that they have a mass of 17 grams. Bob think that he has disproved this law, but in reality the rest of the mass was given off as smoke. What law is this?
What is The law of Conservation of Mass?
500
These are negativly charged and help determine how and what the element can bond with to make compounds. For an element to be stable it must have 8 of these in its outer shell.
What are valence electrons?
500
What does the Law of Conservation of Energy state?
What is energy cannot be created or destroyed?
500
The solid that is formed when two substances are mixed together.