Unit 5 Chem
What coefficients are required to balanced this equation? ___Fe2O3+____CO->___Fe+___CO2
1,3,2,3
The chemical reaction below represents an unbalanced chemical reaction: Fe+O2->Fe2O3 when the equation is balanced, what coefficient is needed for Fe2O3?
2
which chemical equation is balanced to show that mass is conserved during the reaction?
2H2O2->2H2O+O2
how many molecules of O2 are needed to balance this chemical reaction: 2CH3OH+?O2->2CO2+4H2O
3
the chemical reaction produces two new substances, and each product has a mass of 25 grams. what was the total mass of reactants?
50 grams
Which of the following represents a double displacement reaction?
AB+CD->AD+CB
what is the net ionic equation for the reaction between aqueous solutions of LiBr and AgNO3?
Ag^+(aq)+Br^-(aq)->AgBr(s)
Given the reaction: 2X+Cr2O3->X2O3+2Cr the metal represented by X above could be
Al
When aluminum and sulfur react, which compound is produced?
Al2S3
Which of the following chemical reactions is a decomposition reaction?
BaCO3->BaO+CO2
Which of the following is a balanced equation for the synthesis of methane from carbon and hydrogen?
C+2H2->CH4
which compound is a nonelectrolyte
C12H22O11 (carbon tetra chloride)
Which compound is an electrolyte
CH3COOH
what equation represents a decomposition reaction?
CaCO3(s)->CaO(s)+CO2(g)
which substance dissolves in pure water and produces a solution that is a good conductor of electricity?
CaCl2
Which is the correctly balanced equation?
Cl2+2NaI->2NaCl+I2
which equation represents a single replacement reaction that can occur?
F2+2NaCl->2NaF+Cl2
when methane (CH4) is burned in the presence of oxygen (O2), the two chemicals react together in a process called combustion. Which of these compounds could be a possible product of this combustion reaction?
H2O
which pair of substances will likely undergo a single replacement reaction?
K and BaCl2
which is a correctly balanced chemical equation?
K2CO3+BaCl2->2KCl+BaCO3
all chemical reactions have a conservation of
Mass, charge, and energy
which metal will react spontaneously with HCl(aq)
Mg
When Na2O reacts with H2O, what is produced?
NaOH
which of the following describes a chemical change?
a metal fork became rusted
which substance can be decomposed by a chemical charge?
ammonia
why does a balanced chemical equation support the law of conservation of mass?
because the total mass of the reactants equals the total mass of the products
Calcium and boron react to form calcium boride, as represented by the chemical equation below. Ca+6B->CaB6 which type of reaction is shown by this equation?
combination
This balanced equation represents a chemical reaction. 2C4H10(g)+13O2(g)->8CO2(g)+10H2O(g) what type of chemical reaction is represented by the equation?
combustion
when pure N2O5 is heated under certain conditions, O2 and NO2 are produced. What type of reaction is this?
decomposition
when AgNO3(aq) is mixed with NaCl(aq), which type of reaction will occur
double replacement
which best explains why the total mass of the products would be less than the total weight of the reactants after a chemical reaction
gases were released to the atmosphere.
which of these is an example of a physical change
melting ice
which is an example of a chemical reaction
nails rusting
Given the reaction: HCl(aq)+LiOH(aq)->HOH(l)+LiCl(aq) the reaction is best described as
neutralization
a teacher demonstrates a decomposition reaction, which is the correct way?
running an electrical current through water to produce hydrogen and oxygen
What type of chemical reaction is represented by this equation? 2Li(s)+2H2O(L)->2LiOH(aq)+H2(g)
single replacement
consider this reaction: NH3(g)+HCl(g)->NH4Cl(s) which type of reaction does it represent?
synthesis
sulfur atom with three oxygen atoms + oxygen atom with two hydrogen atoms equals a sulfur atom with four oxygen atoms and two hydrogen atoms.
synthesis
which remains the same during a chemical reaction?
the total number of atoms
which diagram illustrates that matter is always conserved during a chemical reaction?
two pairs of oxygen each with two hydrogen atoms, equation with 2 single and one pair of oxygen atoms the singles with 2 hydrogen atoms
