Chemical Reactions
Periodic Table
More Chemical Reactions
Science Questions
Balancing Equations
100
What are numbers that appear before formula in a chemical equation that can change to balance an equation?
What is cofficients...
100
How many groups are on the periodic table?
What is 18
100
A chemical reaction that absorbs energy from its surroundings is called an __________
What is endothermic reaction
100
A(n) _______ bond forms when electrons are transferred from one atom to another
What is ionic bond
100
Na+O2----- Na2O
What is 4Na+O2----2Na2O
200
On the left side of the equation, the substances that undergo change are called ________.
What is reactants
200
The most reactive metals are the ________
What is alkali metals
200
A chemical reaction that releases energy to its surroundings is called ________
What is exothermic reaction
200
________ is the energy an object has due to its motion
What is kinetic energy
200
Cu+O2 ----CuO
What is 2Cu+O2 ---- 2CuO
300
A ________ _______ is a representation of a chemical reaction in which the reactants and products are expressed as formulas
What is chemical equation
300
In a modern periodic table, elements are arranged in order or
What is atomic mass
300
_______ are elements with properties that fall between those of metals and nonmetals
What is metalloids
300
In which state(s) of matter can materials take the shape of their containers
What is liquid and gas
300
N2O5+H2O----HNO3
What is N2O5+H2O---2HNO3
400
On the right side of a chemical equation, the new substances formed as a result of that change are called ________.
What is Products
400
The atomic number of sulfur is 16. How many electrons are there in an atom of sulfur 34?
What is 16
400
________ is a materical's ability to burn in the presence of oxygen
What is flammability
400
Which scientist was recognized for organizing the elements on the periodic table
What is Dmitri Mendeleev
400
KNO3----KNO2+O2
What is 2KNO3---2KNO2+O2
500
Identify (4) of the types of reactions
What is synthesis, decompositon, single replacement, double replacement, combustion, and oxidation reduction
500
One twelfth the mass of a carbon 12 atom is used to define a(n)
What is atomic mass unit
500
What does the law of conservation states?
What is Mass is neither created nor destroyed
500
Formation of a precipitate is usually evidence of
What is a chemical change
500
KCl+F2---KF+Cl2
What is 2KCl+F2---2KF+Cl2
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