Answer:
A
Explanation:
Percent yield= Actual yield/Theoretical yield x 100
The problem tells you that 6.33g of As is produced (actual yield), but 7.71g should be produced (theoretical yield). So 6.33/7.71= 0.821 x 100= 82.1%
Answer:
82.1%
Explanation:
A. I got it right on my test
element A it's valance number is 3 and element B it's valance number is 6 make it compound
Answer:
A2B
Explanation:
A = 3
B = 6
exchange valencies
A6B3
A2B
An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?
0
24
28
52
Answer:
24
Explanation:
In an uncharged atom, the number of protons is always equal to the number of electrons. For example, carbon atoms include six protons and six electrons, so carbon's atomic number is 6.
Similarly, since an atom of chromium contains 24 protons, it also contains the same amount of electrons, which is 24.
Answer:
24 is your answer
Explanation:
Advertisements for tobacco and alcohol products work because they "tell the truth."
True
False
12 G of carbon react with 16 G of oxygen how much carbon monoxide is formed
Answer:
28 g CO
Explanation:
First convert grams to moles.
1 mole C = 12.011 g (I'm just going to round to 12 for the sake of this problem)
12 g C • [tex]\frac{1 mol C}{12 g C}[/tex] = 1 mol C
1 mol O = 15.996 g (I'm just going to round to 16)
16 g O • [tex]\frac{1 mol O}{16 g O}[/tex] = 1 mol O
So the unbalanced equation is:
[tex]C + O_{2}[/tex] -> [tex]CO[/tex] (the oxygen has a 2 subscript because it is part of HONClBrIF meaning when not in a compound these elements appear in pairs - called diatomic elements)
The balanced equation is:
[tex]2 C + O_2[/tex] -> [tex]2 CO[/tex]
However, carbon is the limiting reactant in this equation and two moles cannot react because only 12 g (1 mole) are present. Therefore, use the equation
[tex]C + \frac{1}{2} O_2[/tex] -> [tex]CO[/tex].
1 mole of CO is formed, therefore 12 g + 16 g = 28 g CO.
A 150 g sample of brass at 90.0 degrees Celsius is placed in a calorimeter cup that contains 230 g of water at 20.0 degrees Celsius. Disregard the absorption of heat by the cup and calculate the final temperature of the brass and water. Specific heat of water = 4.18 J/gC, specific heat of brass=0.380 J/gC.
Answer:
for brass
mass m1 =150g
t1=90°c
specific heat of brass s1=0.380 J/gC.
for water
t2=20°c
mass m2=230g
Specific heat of water s2= 4.18 J/gC,
Explanation:
we have
Q1=Q2
m1s1{t-t1)=m2s2(t2-t)
150×0.380(t-90)=230×4.18(20-t)
57t-5130=961.4×20-961.4t
57t +961.4t=19228+5130
1018.4t=24358
t=24358/1018.4=23.91=24°c is final temperature
If a cell were compared to a school, which part of the school would represent the cell's nucleus?
ОА the classroom walls because they give the structure to the school
B
the cafeteria cooks because they make food for the entire school
С
the principal because he or she controls all the activity in the school
D
the fence because it controls what enters and exits the school
Answer:
C-The principal because he or she controls all the activity in the school
A surplus (having “extra”) or deficit (having “fewer”) of electrons?
Answer:
Charge
Explanation:
A surplus (having "extra") or deficit (having "fewer") of electrons possessed by an object. A charge can cause attractive or repulsive forces which can be observed in some cases (e.g. pith balls, bits of plastic).
what are the roles of the mucous select two options PLEASE HELP
Answer:
The answer is A and C
1.a)concentrated sulphuric acid reacts with ethanol to produce ethene
(i) state the conditions for the reaction
.......................................................................
write the equation of the leads to formation of ethene In (a) (i) above.
.....................................................................................
state the property of sulphuric acid shown in reaction (a)(ii)
...................................................................................
Answer: a) Temperature of [tex]170^0C[/tex]
b) [tex]C_2H_5OH\stackrel{conc H_2SO_4, 170^0C}\rightarrow C_2H_4+H_2O[/tex]
c) dehydrating agent
Explanation:
Ethanol is heated with an excess of concentrated sulfuric acid at a temperature of 170°C to produce ethene.
The balanced chemical reaction is:
[tex]C_2H_5OH\stackrel{conc H_2SO_4, 170^0C}\rightarrow C_2H_4+H_2O[/tex]
Here concentrated sulfuric acid removes a water molecule from ethanol and thus acts as a dehydrating agent.
2. What is the molarity of a CuBr2 solution that contains 446 g of solute in 5000 mL of solution?
Answer:
0.4 M
Explanation:
M=moles/Liters
Convert grams to moles (446/223.37=1.99668711)
Convert 5000 mL to liters (5000/1000)
Plug in the values and solve
M=2/5
M=0.4
HELP ASAP!!! please chemistry sucks
Helppp 88.0 grams of Boron, how many atoms of Boron (B) are present?
Answer:
There are no atoms becuase atoms are not in elements.
Explanation:
Why does Play-Doh taste salty?
Pls my science teacher wants an answer so pls answer ASAP i need an explaination
Answer:
It's made of salt
Explanation:
The recipe has salt as an ingredient
Answer:
playdoh is literally made of salt. thats why it tastes salty
Explanation:
How many grams of Ag are produced if I start the reaction with 5.5 mol Cu?
Equation given:
Cu + 2AgNO3 -> 2Ag + Cu(NO3)2
Answer:
9.34 g Ag
Explanation:
what is 20+9-10+67=?
Answer:
86
Explanation:
20 plus 9 equals 29 minus 10 equals 19 plus 67 equals 86
Answer:
86
Explanation:
20+9=29
29-10=19
19+67=86
5. If all the particles in a material are made up of
several smaller particles, and every larger particle
is identical, is the material a pure substance or
not? Explain your reasoning.
Answer:
No. Because a pure substance, no matter if an element, compound, it can only contain one kind of particle .
Explanation:
Identify the products in the reaction HCI + NaOH → NaCl + H20.
A. HCI, NaOH, NaCl, and H2O
B. HCl and NaOH
C. NaCl and H20
D. NaOH and H20
The products in the reaction HCI + NaOH → NaCl + H20, are C. NaCl and H20.
How are these the products ?The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is a neutralization reaction, which means that it produces a salt and water. In this case, the salt is sodium chloride (NaCl) and the water is H2O.
The other options are not correct because they do not include all of the products of the reaction. Option (A) includes HCl and NaOH, but it does not include H2O. Option (B) only includes HCl and NaOH. Option (D) only includes NaOH and H2O.
In conclusion, option C is correct.
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What would be the theoretical yield in grams of carbon dioxide in the reaction shown below if 30 g of C6H12O6 were reacted with an excess of oxygen? C6H12O6 + O2 -> CO2 + H2O
Answer: Thus 44 g of [tex]CO_2[/tex] will be produced if 30 g of [tex]C_6H_{12}O_6[/tex] were reacted with an excess of oxygen
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} C_6H_{12}O_6 =\frac{30g}{180g/mol}=0.17moles[/tex]
The balanced chemical equation is:
[tex]C_6H_{12}O_6 +6O_2(g)\rightarrow 6CO_2+6H_2O(g)[/tex]
As [tex]C_6H_{12}O_6[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
According to stoichiometry :
1 mole of [tex]C_6H_{12}O_6[/tex] produce = 6 moles of [tex]CO_2[/tex]
Thus 0.17 moles of [tex]C_6H_{12}O_6[/tex] will produce=[tex]\frac{6}{1}\times 0.17=1.0mole[/tex] of [tex]CO_2[/tex]
Mass of [tex]CO_2=moles\times {\text {Molar mass}}=1.0moles\times 44g/mol=44g[/tex]
Thus 44 g of [tex]CO_2[/tex] will be produced if 30 g of [tex]C_6H_{12}O_6[/tex] were reacted with an excess of oxygen.
What is a reactant?
A- Solid particles that have been separated from a solution
B- A substance that has the ability to be dissolved by a solvent
C- A mixture in which a solid and a liquid or two liquids are mixed occurs
D- The substance present before a chemical reaction occurs
Answer:
it is D
Explanation:
because it is a substance that participants in a chemical reaction.
with 24.1 moles of P4O10 how many moles of H3PO4 could be made
Magnesium bromide is prepared in a laboratory using the reaction below. Typically, the magnesium bromide is recoveted as a solid by heating way the remaining water
Mg(s) + 2 HB-(aq) - MgBrac) + H200)
If 0.940 mole of HBr in solution is added to 16.5 grams of Mgo in a beaker and then is heated until dry, what are the expected contents of the beaker?
Our bodies use nitrogen
Question 2 options:
directly from the air
after bacteria make N into ammonia molecules
from the plants and other animals we eat
all of the above
it's the 1 and 3 I think it's that hopefully it's right
Which is Not part of hydrogen's line-emission spectrum?
Answer: Aufbau series.
Explanation:
"Show a general equation for polymerisation"
Answer:
Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.
Explanation:
Answer the question using the equation: HCl(aq)+H2O(l)→H+(aq)+Cl-(aq)+H2O(l)→H3O+(aq)+Cl-(aq) Which product is a Lewis base?
Answer:
Cl-
Explanation:
The equation of the reaction is;
H+(aq)+Cl-(aq)+H2O(l)→H3O+(aq)+Cl-(aq)
Lewis base refers to substances that can donate a lone pair of electrons(e.g OH^-, Cl^- etc) or a pair of nonbonding electrons.(eg NH3, H20 etc). A Lewis base is therefore an electron-pair donor. They are easily recognized because they often have lone pairs or are negatively charged species.
If we look at the products, Cl- is a Lewis base because it is a lone pair donor. We see this more clearly because the specie is negatively charged.
Answer:
Cl
Explanation:
How does an increase in temperature affect the equilibrium concentration of the underlined substance and K for each of the following reactions?
(c) SO2(g) S(s) + O2(g) DH° = 297 kJ
Explanation:
Due to the positive value of the change in temperature, this is an endothermic reaction.
Since the forward reaction is endothermic, increasing the temperature increases the equilibrium constant (k).
In an equilibrium system, the position of the equilibrium will move in a way to annul the change made to the system. An increase in temperature for an endothermic reaction would favour the reaction, leading to increase in amount of products and decrease in amount of reactants.
Anna notices that different types of clothing stick together when they are dried in an electric dryer. When the clothes are pulled apart, they make sparks and a crackling sound due to electric forces of attraction. How can Anna reduce the amount the clothing clings together in the dryer?
Add a substance to the wash that reduces the number of charges transferred.
Increase the temperature of the air in the dryer to weaken the electric forces.
Dry more clothes at the same time so that there is less room for electric forces.
Change the charges on the clothes by running the dryer at a faster speed.
Answer:
A: Add a substance to the wash that reduces the number of charges transferred.
Explanation:
The attraction between opposite charges make the clothes attract together. To reduce them Increase the temperature of the air in the dryer to weaken the electric forces. Hence, option A is correct.
What is electric dryer?An electric dryer is used to dry the clothes and hair or other substances using electric current. A substance can have both negative and positive charges. The opposite charges will attract together while the negative charges repel.
By exposing clothes to electric dryer it will gain electrons from the dryer and the positive poles of the clothes will attracts it. The electric current from the dryer will make clothes temporarily polarised.
If temperature increases, the intermolecular force of attraction decreases by making the kinetic energy of molecules raised. Therefore by increasing the temperature of air from the dryer the attraction can be reduced.
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Calculate the mass (in g) of solute needed to prepare a solution with the given concentration and volume.
Sea water has a concentration of approximately 0.60 M sodium chloride. How much
sodium chloride is dissolved in 1.00 L of solution?
Coke has a concentration of 0.342 M. What mass of sugar (in g) is dissolved in a 2-L
bottle of coke?
What volume of concentrated nitric acid (15.8 M) is needed to prepare 4.0 L of a 2.0 M solution?
What volume of 9.0 M copper (II) sulfate stock solution is needed to prepare 3.0 L of a 5.0 M
solution?
Answer:
1. 35g NaCl.
2. 234g sugar.
3. 0.506L of concentrated nitric acid are needed.
4. 1.67L of 9.0M copper (II) sulfate are needed
Explanation:
Molarity is defined as the ratio between moles of solute and the volume of the solution.
1. 1.00L * (0.60mol / L) = 0.60 moles NaCl are dissolved
To convert moles to mass we must use its molar mass:
0.60mol NaCl * (58.44g/mol) =
35g NaCl
2. 2L * (0.342mol / L) = 0.684 moles Sugar = moles sucrose
0.684 mol * (342.30g / mol) = 234g sugar
3. 4L of a 2.0M are:
4L * (2.0mol/L) = 8moles
8mol * (1L / 15.8mol) = 0.506L of concentrated nitric acid are needed
4. 3.0L * (5.0 mol / L) = 15.0 moles copper (II) sulfate.
15.0mol * (1L / 9.0mol) = 1.67L of 9.0M copper (II) sulfate are needed
What element is on period 5 group/family 11
Answer:
47
Ag
Silver
107.87
Explanation:
What volume (in L) of water vapor will be
produced from the reaction of 4.95 L of ethane
(C2He)?
2C2H6(g) + 702(9) — 4CO2(g) + 6H2O(g)
Answer:
14.85L of water are produced
Explanation:
Based on Avigadro's law, the volume is directly proportional to the moles of a gas.
Based on the equation:
2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(g)
2 moles of ethane produce 6 moles of H₂O.
Using Avogadro's law: 2L of ethane produce 6L of H₂O.
The addition of 4.95L of ethane are:
4.95L ethane * (6L H₂O / 2L C₂H₆) =
14.85L of water are produced