Answers
Answer: Think and you will get it right!
Explanation:
To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.
Related Questions
An experiment requires 74.2 mL of ethyl alcohol. If the density of ethyl alcohol is 0.790 g/cm3, what is the mass of
74.2 mL of ethyl alcohol?
O a. none of these
O b.58.6 g
O c.93.9 g
O d. 7.90 g
Oe. 10.6 g
Answers
Answer:
b) 58.6
Explanation:
1ml = 1cm³
74.2 x 0.790 = 58.618g
HELP PLEASE :D
(science)
For the first drop down its: Friction,gravity, normal force,push
Thanks
Answers
[tex]\bold{Heya~!}[/tex]
For the first drop down.
Your answer will be is :
C. Normal force.And, the second drop down.
Your answer will be is :
Hope It Helps ! ~
#LearnWithBrainly
[tex]\underline{Answer~:}[/tex]
Jace ~
The Haber-Bosch process operates at reaction pressures of 200.0
atm and higher. What is this pressure in psi? fill in the blank
Answers
sana maka tulong ❣️
Fe2+(s) + Cr6+(aq) → Fe3+(aq) + Cr3+(aq)
Which element is being reduced?_______
Which element is being oxidized?_______
Which reactant is the reducing agent?_______
Which reactant is the oxidizing agent?_______
Answers
Explanation:
A. Cr reduced
B. Fe oxidized
C. Fe reducing agent
D. Cr oxidizing agent
[tex]ok \: here \: is \: your \: answer \: [/tex]
1) Cr is being reduced.
2) Fe is being oxidized.
3) Fe is the reducing agent.
4) Cr is the oxidizing agent.
A chemist prepares a solution of iron(II) bromide (FeBr2) by measuring out 46. g of iron(II) bromide into a 400. mL volumetric flask
and filling the flask to the mark with water.
Calculate the concentration in mol/L of the chemist's iron(II) bromide solution. Round your answer to 2 significant digits.
Answers
Solution
Given mass of FeBr2 = 85.5 g
Molar mass of FeBr2 = 215.65
No. of Moles of FeBr2 = Given Mass / Molar mass = 85.5 / 215.65
No. of Moles = 0.3964
Given Volume is 450 mL i.e. 0.450 L
Now Concentration = 0.3964/0.450
Hence Concentration = 0.881 mol/L
Suppose that a person eats a diet of 2398 Calories per day.
Convert this energy into joules.
Convert this energy into kilojoules.
Convert this energy into kilowatt-hours.
Answers
Answer:
10,033,232 joules
10,033.232 kilojoules
2.78837209 kilowatt-hours
Explanation:
2398 * 4184 =
2398 * 4.184 =
2398 / 860 =
Please help!
Fe2O3 + C → CO + Fe
Answers
The liquid and solid state exist because of:
Answers
Answer: Its B
Explanation:
which of the following elements is the most reactive between boron, sulfur, and chlorine
Answers
Answer:
Chlorine would be the answer
Explanation:
Please please helppp
Answers
Answer:
is that geography because that is my favourite subject... I can help
will mark as brainliest if correct
Answers
Answer:
A) The bonds of the reactants must be broken
D) The bonds of the products must be formed
E) Breaking bonds require an input of energy
H) Forming bonds releases energy
These are all the 4 correct statements
Explanation:
Breaking bonds is an ENDOTHERMIC process, meaning that it takes in energy to break the bonds of the reactants.
Forming bonds is an EXOTHERMIC process, meaning that it takes in energy to break the bonds of the reactants.
Which of the following is a polyatomic ion?
A.) Chloride, Cl−
B.) Nitrate, NO3 −
C.) Carbon dioxide, CO2
D.) Iron(III), Fe3+
Answers
Aspirin, C9H8O4, slowly decomposes at room temperature by reacting with water in the atmosphere to produce acetic acid, HC2H3O2, and 2-hydroxybenzoic acid, C7H6O3 (this is why old bottles of aspirin often smell like vinegar):
Answers
Based on the chemical reactivity, the decomposition of aspirin in the presence of water produces acetic acid and 2-hydroxybenzoic acid.
What is a decomposition reaction?A decomposition reaction is a reaction in which a large substance is broken down into smaller substances.
Example of a decomposition reaction is the decomposition of aspirin to produce acetic acid.
Aspirin (C9H8O4) slowly decomposes at room temperature by reacting with water in the atmosphere to produce acetic acid, HC2H3O2, and 2-hydroxybenzoic acid, C7H6O3.
The equation of the reaction is given below:
C9H8O4 + H2O -----> HC2H3O2 + C7H6O3Therefore, the decomposition of aspirin produces acetic acid and 2-hydroxybenzoic acid.
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Do you think aerodynamics is MORE important or LESS important in CO2 cars compared to regular pinewood derby cars?
Answers
Answer:
more
Explanation:
bc it makes science so I hope you get it tight.
Is Sodium bicarbonate (NaHCO3) held together through ionic or covalent bonds? Explain your reasoning.
Answers
Answer:
No
Explanation:
No
Sodium bicarbonate is an Ionic compound.
Sodium bicarbonate, also known as baking soda, is considered an ionic compound, not a covalent compound.
2. Barium compounds are chemically very similar to strontium compounds. Water-soluble
compounds of both are toxic, but to different degrees. An antidote for barium chloride
poisoning is to orally administer 30 grams of sodium sulfate in 250 mL of water. Explain the
chemical basis for this antidote.
Answers
The ability of sodium sulfate to act as an antidote to barium chloride poisoning is because displaces barium in barium chloride to form sodium chloride and insoluble harmless barium sulfate.
Why is a solution of sodium sulfate used as an antidote?The ability of sodium sulfate to act as an antidote to barium chloride poisoning is because of the reactivity of sodium.
Sodium is a more reactive metal than barium, so it displaces barium in barium chloride to form sodium chloride and insoluble harmless barium sulfate.
The equation of the reaction is given below:
BaCl2 + Na2SO4 ----> BaSO4 + NaClTherefore, the ability of sodium sulfate to act as an antidote to barium chloride poisoning is because displaces barium in barium chloride to form sodium chloride and insoluble harmless barium sulfate.
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There are different kinds of poisonings. Sodium sulfate are known to be an effective antidote because they create or produce a kind of precipitate with barium that is said to be not easily absorbed from the gastrointestinal tract.
There have been a lot of Cases of barium poisoning that are known to be followed by high hypokalemia.Soluble sulfates such as sodium sulfate and others such as potassium infusion are known to be a key antidote.
If given promptly and in the right dosage, soluble sulfates are known to be an effective antidote.
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the mass of one mole of sulfur is
Answers
Based on the table above, oil would transfer heat the best because its specific heat is the
Answers
Answer:
Based on the table above, sesame oil would transfer heat the best because its specific heat is the lowest.
Explanation:
Edge 2022
the line of best fit is v = t +
Answers
Answer:
So we're going to use our slope formula y2. Minus y1 over x2 minus x1 that's five minus negative three over X 2 minus X 1 that's seven minus 1 so that gives us 6. And this gives us 8 which equals 4/3.
Explanation:
Answer:
THE LINE OF BEST FIT
V = 0.003 OR .003
T = 0.003 OR .003
Explanation:
V and T are DIRECTLY PROPORTIONAL
PLS RATE AND THANK IF THIS ANSWER HAS HELPED YOU
IT WAS A PLEASURE
P.S This was a struggle question for me too but this answer is right!
What was the chemical purpose of heating the MnSO4⋅H2O? Why is this procedure important?
Answers
The chemical purpose of heating the MnSO4⋅H2O is to eliminate water with the formation of new compounds.
Dehydration reactionsDehydration reaction is a type of chemical reaction that involves the removal of water which would eventually lead to the formation of a new compound.
The molecule of MnSO4⋅H2O contains a molecule of water(H2O). After heating of the molecule, water is lost giving rise to the dry compound MnSO4.
Other examples of dehydration reactions are:
Reactions that produce acid anhydrides.Reactions that involve the production of polymers.Reaction of sucrose with concentrated sulfuric acidTherefore, the chemical purpose of heating the MnSO4⋅H2O is to eliminate water with the formation of new compounds.
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Explain the properties of metals by completing the following sentences, The of transition metals ncreases as the number of delocalized electrons Because the in metals are strongly attracted to the delocalized electrons in the metal, they are not easily from the metal causing the metal to be very Alkali metals are than transition metals because they have only per atom The of metals vary greatly. The melting points are not as extreme as the It does not take an extreme amount of energy for to be able to move past each other. However, during atoms must be separated from a group of which requires a lot of Copyright McGraw-Hill Education Light absorbed and released by the in a metal accounts for the of the metal,
Answers
The high melting and boiling point of metals is due to the attraction between the delocalized electrons and the positive ions in metallic bonding.
What are metals?Metals are mostly hards and shiny solid elements which forms ions by loss of electrons.
Metals are found in group 1, 2 and 3 of the periodic table of elements.
Transition metals are found in the d- and f-block of the periodic table.
The melting and boiling point of transition metals increases as the number of delocalized electrons increases.
Because the positive ions in metals are strongly attracted to the delocalized electrons in the metal, they are not easily removed from the metal causing the metal to be very hard, malleable and ductile.
Alkali metals are more reactive than transition metals because they have only one valence electron per atom
The boiling points of metals vary greatly.
The melting points are not as extreme as the boiling point. It does not take an extreme amount of energy for atoms to be able to move past each other. However, during boiling, atoms must be separated from a group of which requires a lot of energy.
Light absorbed and released by the electrons in a metal accounts for the luster of the metal.
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is NO2 an ionic or covalent bond? Will give brainliest for the correct answer
Answers
Answer:
Covalent
Explanation:
hi, How are you?
NO2 is already polar, due to the fact that nitrogen shares a maximum of 3 electrons. Thus N makes two covalent bonds with one oxygen, one covalent and one dative with the other. And there's still a free electron left that causes the molecule to bend, forming an angle, and so the NO2 molecule is polar with an angle other than 180.
If a water fountain has an average flow rate of 0.64 gallons per minute, how many
seconds does it take to dispense 842.75 mL. (Hint: 3.78541 L = 1 gal, 60 s = 1 min)
Answers
The time taken for the water fountain to dispense 842.75 mL of water is 20.625 seconds
What is time?Time can be defined as the measure of past, present or future events.
To calculate the time taken to dispense 842.75 mL of water, we use the formula below.
Formula:
F = V/t................ Equation 1Where:
F = Average flow rate of the fountainV = Volume of the watert = time.Make t the subject of the equation.
t = V/F................ Equation 2From the question,
Given:
F = 0.64 gallons per minutesV = 842.75 mL = (842.75/1000)/(3.78541) gal = 0.22 gal.Substitute these values into equation 2
t = 0.22/0.64t = 0.34375 minutes.t = (0.34375×60) = 20.625 seconds.Hence, The time taken for the water fountain to dispense 842.75 mL of water, is 20.625 seconds.
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Calculate the number of atoms in a 3.31 x 10 g sample of lithium.
g
Answers
Explanation:
atomic mass of Li = 7 amu
so we know that there are about (33.1)/7 = 0.47 mol
Multiply this by 6.02 * 10^23 particles per mol, and we get about 2.83 * 10^23 particles
What is observed in aqueous mixture of zinc chloride and silver nitrate
Answers
100 points+Brainliest for correct answer
An electron on an energy level has an energy of 16.32 x 10−19 J. It moves to another level by releasing 5.4 x 10−19 J of energy. Which of the following descriptions mostly likely explains what occurred?
The electron moved down to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved down to an energy level and has an energy of 21.72 x 10−19 J.
The electron moved up to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answers
Answer:
O Option 1
Explanation:
IF ENERGY IS RELEASED, THEN ENERGY RELEASED SHOULD BE SUBTRACTED FROM ORIGINAL.
(16.32 X 10^-19) - (5.4 X 10^-19)
10.92 X 10^-19
Two escalators move people up and down between floors of a shopping mall at the same rate, either up or down. What of the following statements regarding the motion of escalators is true?
Answers
Answer:
Velocity can vary when speed is constant
How do you figure out molality
Answers
the kilograms of solvent* Basically if we had 1.00 mole of sucrose (it's about 342 3 grams) and
proceeded to mix it into exactly 1.00 liter water. It would dissolve and make sugar
water. We keep adding water, dissolving and stirring until all the solid was gone. We
then made sure everything was well-mixed.
What would be the molality of this solution? Notice that my one liter of water weighs
1000 grams (density of water = 1.00 g / mL and 1000 mL of water in a liter).
A bike moves with a speed of 40 km/h for 1 h and then with a speed of 60 km/h for the next 2 h. What is the total distance covered by the bike during the complete journey?
Answers
Answer:
40×1=40
60×2=120
40+120=160
Which statement correctly describes a reaction in dynamic equilibrium?
o At dynamic equilibrium, the reactions stop and the amounts of reactants and products do not change.
o At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.
o At dynamic equilibrium, the reactions stop but the amounts of reactants and products are changing.
o At dynamic equilibrium, the reactions continue and the amounts of reactants and products are changing.
Answers
Answer:
"At dynamic equilibrium the reactions continue but the amounts of reactants and products do not change." would be the correct description
Explanation:
Dynamic equilibrium occurs when the rates of change and concentration are the same, so the reaction still takes place, but the amounts of reactants and products stay the same without any change.
According to chemical equilibrium, the statement which correctly describes dynamic equilibrium is that at dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.
What is chemical equilibrium?Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.
At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.
Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.
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