There are 7 C atoms on the left-hand side, so we need 7 C atoms on the right-hand side. Add a 7 in front of the CO2...7CO2+H2O on right side now.
We have fixed 16 H atoms on the left-hand side, so we need 16 H atoms on the right-hand side. Add an 8 in front of H2O to make 16 (8x2)...7CO2+8H2O on right side now.
There are 22 O atoms on the right-hand side: 14 from the CO2 and 8 from the H2O. Add an 11 in front of the O2 on the left side to make 22 (11x2).
Every formula now has a fixed coefficient. You should have a balanced equation of...
4) is Fe+2 because that is reduced
5) I believe it is correct
2) Unbalanced equation: Ca + O2 (g) -> CaO
3) Balanced equation: 2Ca + O2 (g) -> 2CaO
2. The reaction is combination.
1. The reaction between zinc and acetic acid is
2Zn + 2C2H4O2 → 2Zn(CH3COO)2 + H2
2. The reaction between zinc and acetic acid is double displacement.
3. The evidence that a reaction was taking place is the presence of bubbles.
2.) From the balanced chemical reaction, the correct answer is D. Copper is oxidized.
3.) From the balanced chemical reaction, the correct answer is B. Adding more of gas C to the system will shift the equilibrium to the left.
4.) The correct answer is option D, K2Cr2O7 + KOH yields 2 K2CrO4 + H2O
b.)2 AgCl (s)
2.)Sodium metal is added to water. Which of the following would be observed in the lab?
a.)A basic solution and bubbles of hydrogen gas.
3.)When sodium chloride and lead (II) nitrate react in an aqueous solution, a yellow precipitate is formed. What is the identity of the precipitate?
4.Which of the following metals could not be used to form solid copper from a solution of copper (II) chloride?
5.Which of the following would not result in a chemical reaction?
d. barium nitrate + copper (II) sulfate
6.A piece of copper wire is added to a solution of silver (I) nitrate. Which of the following is the correct balanced equation for this reaction? Copper forms +2 ions.
a.)Cu (s) + 2 AgNO3 (aq) → 2 Ag (s) + Cu(NO3)2 (aq)
7.What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?
a.)No reaction will occur between bromine and sodium iodide
8.Which of the following is most likely to be an endothermic reaction?
9.Which of the following observations would be true of the chemical reaction below? Check all that apply. CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + H2O (l) + CO2 (g)
d.)Bubbles of a gas would be produced. The gas should ignite a glowing wood splint.
Answer is B. gains electrons
2. If any of the reactants or products in a reaction contains oxygen, then the reaction is a redox reaction.
Answer is False
3. Preventing iron corrosion is important because many structures, including bridges and iron railings, are likely to rust over time and become weaker. Which of the following conditions would make corrosion more likely?
Answer is A.
4. The oxidation number of a metal is always the same for that metal.
Answer is False.
5. The sum of all oxidation numbers:
Answer is C.
6. In the reaction, 2 Li (s) + Cl2 (g) Imported Asset 2 LiCl (s), the reducing agent is:
Answer is A.
7.In the reaction, C + 2 S Imported Asset CS2, the substance that is the oxidizing agent is:
Answer is B.
8. How many electrons should be added to balance the following oxidation half-reaction, H2O2 Imported Asset 2 H+ + O2?
Answer is A.
9. When balancing the oxidation and reduction half-reactions for acidic solutions, you should:
Answer is C.
10. The half-reaction occurring at the anode of an electrochemical reaction is comparable to:
Answer is B.
11. The voltaic cell produces electric current from a spontaneous chemical reaction, but electrolytic reactions are not spontaneous.
Answer is False.
The number of oxygen atoms 18 atoms of oxygen ( answer D)
count the number of oxygen atoms in Ba(ClO3)2
that is = 3 x2 = 6 atoms
then multiply by 3 since there are 3 molecules of Ba(ClO3)2
that = 6 x3 = 18 atoms of oxygen
The number of atoms of oxygen is 18 atoms of Oxygen ( answer D)
Step 1: count the number of oxygen atoms in Fe(NO3)2
that is = 3 x2 = 6 atoms of Oxygen
Step 2: multiply by total number of Fe(NO3)2 molecules ( 3 molecules)
that is , 6 x3 = 18 atoms of oxygen
The coefficient in front of H2O is 4 ( answer 8)
Balance the equation
= 3 Fe + 4 H2O → Fe3O4 + 4 H2
therefore the coefficient in front of H2O = 4
The balance chemical equation is
Zn + 2HCl→ ZnCl2 +H2 ( answer D)
Zn + 2HCl→ ZnCl2 + H2 is balanced since it obey the law of mass conservation.
The coefficient in front of HNO3 is 2 ( answer B)
balance the equation of N2O5 + H2O→ 2HNO3
Therefore the coefficient in front of HNO3 is 2
The number of atoms of Hydrogen is 10 atoms ( answer D)
Step 1: count the number of H atoms in CH3CH2O
= 3 +2= 5 atoms
Step 2: multiply 5 atoms by 2 ( coefficient in front of CH3CH2O)
= 5 atoms x 2 = 10 atoms
The moles of Oxygen gas needed is 2 moles ( answer C)
= 4 Li +O2 → 2Li2O
The mole ratio of Li :O2 = 4:1
therefore the moles of Oxygen = 8 moles x1/4 = 2 moles
The limiting reactant is HCl and 5.8 moles of H2 can be formed
to determine the limiting reagent
Al : AlCl3 is 2 :2 = 1:1 therefore the moles of AlCl3 = 4.5 moles
HCl: AlCl3 = 6:2 therefore the moles of Al2Cl3 = 11.5 x2/6= 3.8 moles
therefore HCl is the limiting reagent since it is totally consumed
moles of HCl formed
The mole ratio of HCl: H2 = 6:3 therefore the moles of H2 = 11.5 x 3/6 = 5.8 moles
The grams of oxygen gas = 20.6 g O2( answer A)
calculate the moles of LiClO3
= 38.7 g / 90.38 g/mol=0.428 moles
by use of mole ratio of of LiClO3: O2= 2:3 the moles of O2
= 0.428 x3/2=0.642 moles
mass =moles x molar mass
= 0.642 moles x 32 g/mol= 20.6 g O2
The grams of silicon nitride that can be formed is 35.88 g( answer C)
find the moles of nitrogen
= 14.33 g/ 28 g/mol=0.512 moles
N2: Si3N4 is 2:1 the moles of SiN4
= 0.512 moles x 1/2=0.256 moles
find the grams of Si3N4
= 0.256 moles x 140.28 g/mol = 35.91 g which is around 35.88 (answer c)
The grams of phosphorus trichloride that can be formed is is 176 g ( answerB)
moles of P4 = 62.4 g / 123.90 g/mol =0.504 moles
moles of cl2 = 136.2/71 g/mol =1.918 moles
P4 : PCl3 is 1:4 therefore the moles of PCl3 = 0.504 x 4=2.016 moles
Cl2 : PCl3 is 6:4 therefore the moles of PCl3= 1.918 moles x 4/6=1.279 moles
Cl2 is the limiting reagent therefore the moles of PCl3 = 1.279 moles
find the mass of PCl3
= 1.279 moles x 137.33 g/mol =176 g
The truth about physical properties is The physical properties include properties like density, melting point, and ductility
Physical properties are be measure or observed without changing the composition of matter.
The coefficient that must be added to balance the equation are
2,1,1,2 ( answer c)
The mass of the product is equal to mass of the reactant when the equation is balanced..
The chemical equation that violates the law of mass conservation of mass is K2SO4 +2Ca(NO3)2→ 2KNO3 + 2CaSO4 ( answer A)
K2SO4 + 2Ca(NO3)2 → 2KNO3 + 2CaSO4 violate this law because the mass of reactant is not equal to mass of product.
For example in )2 there is 16 atoms of aO2 in reactant side while at product side they are 14 atoms.
The double replacement reaction is
K2S + CoCl2→ 2KCl + COS ( answer A)
in Double replacement the cation and anion of the two reactant switch places to form new compound.
NB: find question 41- 45 in the attachment below ( the answer was long could not all fit.)
the answer is definitely c.
smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.