Atoms and Bonding
Chemical Reactions
Chemical Reactions
Reaction Rates
Reactions
100
What is the atomic number and the atomic mass for Oxygen/O?
What is # is 8, mass is 16.
100
Each family on the periodic table has its own characteristic properties based on the number of...
What is the number of valence electrons.
100
In the chemical equation: CaCO3------ CaO+CO2 name the reactants.
What is CaCO3.
100
The numbers in a chemical equation below an element are called.....
What are subscripts.
100
Chemicals in our bodies that speed up reaction rates are called......
What are enzymes.
200
How do the number of valence electrons in elements within the same group compare?
What is they have the same number of valence electrons.
200
What is the chemical name for the compound with the formula Na2S?
What is sodium sulfide.
200
What is the minimum amount of energy required to start a chemical reaction called?
What is activation energy.
200
The law of conservation of mass states....
What is the total mass of the reactants is equal to the total mass of the products.
200
In a chemical equation the large numbers in front of the elements that can be changed if an equation is unbalanced are called.....
What are coefficients.
300
What are the elements in group 17 called?
What are halogens.
300
Why do the Noble gases not react with other elements?
What is they have a complete outer shell.
300
When two or more elements combine to make a more complex substance the process is called.....
What is synthesis.
300
Chemists can control rates of reactions by.... 4 things
What is changing temperature, surface area, concentration and using catalysts and inhibitors.
300
When positively charged and negatively charged atoms bond the compound is held together by a(n)...
What is an ionic bond.
400
On what side of the periodic table are the nonmetals found?
What is to the right of the divide.
400
When two atoms share a chemical bond this is called an___________ bond.
What is covalent.
400
In an ____________ system, matter can enter or escape to the surroundings.
What is open.
400
To decrease the rate of a chemical reaction a chemist would use ....
What is an inhibitor.
400
In an endothermic reaction energy is .....
What is absorbed.
500
When an atom loses an electron, it loses a negative charge and becomes....
What is a positive ion.
500
Which is an example of a chemical change..... a) water boiling b) ice melting c) burning a piece of paper
What is C.
500
A chemical reaction that absorbs energy in the form of heat is called a ........
What is endothermic reaction.
500
Every chemical reaction involves a change in .....
What is energy.
500
On an dot diagram, the dots on the outer energy levels are called....
What are electrons.
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