Answer:
2 H2O(g) + O2(g)
2 O-1 → O20 + 2 e- 4.
Explanation:
Essentially elephant's toothpaste is just the decomposition of H2O2, hydrogen peroxide. It's catalyzed by KMnO4
Balanced Equation: [tex]2H_2O_2 \ -- > \ 2H_2O \ + \ O_2_[/tex]
Unbalanced Equation: [tex]H_2O_2 \ -- > \ H_2O \ + \ O_2[/tex]
when chlorine is added to acetylene tetrachloroethane is formed How many grams of tetrachloroethane are ade if 15 liters of chlorine is used with excess C2H2
35.5 g of tetrachloroethane is added if 15 grams of chlorine is used with excess [tex]C_2H_2[/tex].
What is a balanced chemical equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
Balanced chemical equation:
[tex]2Cl_2 (g) + C_2H_2 (g)[/tex] → [tex]C_2H_2Cl_4(l)[/tex]
In your case, 2 moles of chlorine gas are needed to produce 1 mole of tetrachloroethane, which implies that there's a 2:1 mole ratio between the two.
Calculating the mass of tetrachloroethane.
[tex]m[/tex][tex]C_2H_2Cl_4(l)[/tex] = [tex]15 g[/tex] [tex]Cl_2 (g)[/tex] X [tex]\frac{2 mol \;of \;Cl_2}{70 g \;Cl_2}[/tex] X [tex]\frac{1 mol \;of \;C_2H_2Cl_4(l)}{2 mol \;Cl_2}[/tex] X [tex]\frac{167.8 g \;C_2H_2Cl_4(l))}{1 mol \;C_2H_2Cl_4}[/tex]
[tex]C_2H_2Cl_4(l)[/tex] = [tex]17.75 g[/tex]
[tex]C_2H_2Cl_4(l)[/tex] = [tex]35.5 g[/tex]
Hence, 35.5 g of tetrachloroethane is added if 15 gram of chlorine is used with excess [tex]C_2H_2[/tex]
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Question 3(Multiple Choice Worth 4 points)
(08.04 LC)
Which statement is true about a substance that has a pH value of 14?
O It is a weak base.
O It is a weak acid.
O It is a strong base.
O It is a strong acid.
A substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.
What the different pH reading indicates?The pH value 1 to 6 indicates acidic, 7 shows neutral whereas pH from 8 to 14 shows basic nature. pH 1 shows strong acid which becomes weak when it goes to 6 while on the other hand, pH 8 is a weak base which increases when it reaches to 14.
So we can conclude that a substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.
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Answer:
C. It is a strong base
Explanation:
pH 1 to 6 is acid (weaker)
pH 7 is neutral
pH 6 to 14 is base (stronger)
How many moles of H2O are in 35 grams of H2O?
Answer:
1.94 Moles H2O
Explanation:
1 grams Water to mol = 0.05551 mol
so 35 x 0.05551 = 1.9427952271627198, which rounds to 1.94 moles
27. Write balanced equations that describe the following reactions.
a. the dissociation of perchloric acid in water
b. the dissociation of propanoic acid (CH3CH2CO2H) in
water
c. the dissociation of ammonium ion in water
#a
HClO_4(aq)+H2O(l)—»H3O+(aq)+ClO_4#b
CH3CH2COOH + H2O ==> CH3COO^- +H3O#c
This is reversible reaction
H2O + NH_3 ⇄ OH^- + NH4^+why is vanilla extract brown when vanilla ice cream is white?
please be as detailed as possible in your answer
Answer:
Because vanilla Ice cream contains vastly more milk, sugar, etc. Then vanilla extract. It only takes a very small amount in comparison to adding that flavor.
Explanation:
I hope this helps girl
Why is vanilla ice cream white instead of brown?
It is true that Vanilla beans are brown in color and it is interesting that with this brown color ingredient, Vanilla Ice Cream is still white. Well, the vast majority of vanilla flavoring comes in the form of extract. Vanilla beans are very expensive and pure Vanilla has great flavor. When Ice Cream is made, the Vanilla we put in the Ice Cream is very insignificant quantity when compared to the milk powder, sugar, and cream that goes into the Ice Cream. Due to the whipping and procedure of the making, the brown color of Vanilla is lost amongst the huge quantities of other ingredients and we get milky white yummy Vanilla Ice cream
a given mass of gas occupies 500 cm³ at 25° C calculate the temperature in degree Celsius at which its volume becomes doubled at constant pressure
At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.
What is Charles's law?Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
V₁/T₁ = V₂/T₂
Given that;
Initial volume of gas V₁ = 500cm³Initial temperature of gas T₁ = 25°CIf final volume is double of initial volume.
Final volume V₂ = 2 × 500cm³ = 1000cm³Final temperature T₂ = ?V₁/T₁ = V₂/T₂
V₁T₂ = V₂T₁
T₂ = V₂T₁ / V₁
T₂ = ( 1000cm³ × 25°C ) / 500cm³
T₂ = 25000m³°C / 500cm³
T₂ = 50°C
At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.
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Fluorine-21 has a half-life of approximately 5 seconds. what percentage of the original nuclei would remain after 15 seconds
Answer:
1/8th = 12.5%
Explanation:
Three half lives would be 1/2 * 1/2 * 1/2 = 1/8 th of original
i could really use some help with this question, thank you in advance!
The conjugate base of a strong acid will always . . .
be acidic
be basic
be a spectator
question 2
metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas.
a. if 24.3 g mg are heated with 12.0 g h20, identify the limiting reactant - magnesium or water (steam)?
Explanation:
[tex]molar \: mass(mg) = 24g. {mol}^{ - 1} mass = 24.3g \\ molar \: mass(h20) = 18g. {mol}^{ - 1} mass = 12g \\ n = \frac{mass}{molar \: mass} \\ n(mg) = 1.01mol wich \: is \: substance \: a\\ n(h2o) = 0.67mol \: which \: is \: substance \: b \\ \frac{ |n|a }{ |n|b } : \frac{a}{b} \\ \frac{1.01}{0.67}: \frac{1}{2} \\ 1.51 > 0.50 \\ therefore \: substnce \: b \: which \: is \: water \: steam \: is \: limiting \: reagent [/tex]
the temperature of gas is raised by 100 deggres to 200 deggres. what happens to the volume of the gas
Answer:
Increases by 100 Pa
Explanation:
According to The Ideal Gas Equation,
the temperature of the gas is directly proportional to the volume of the gas present in itIf the temperature rises from 100 K to 200 K, then the volume will increase by 100 Pa (standard unit of Pressure)how many liters is 3.0 g of o2 gas
1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L.
True or false: in an ionic bond, the difference in electronegativities between the two bonding
atoms is greater than the difference in a covalent bond.
Answer:
its true hope this helped :)
What are communication skills??
Answer:
Communication skills are the abilities you use when giving and receiving different kinds of information. Some examples include communicating new ideas, feelings or even an update on your project. Communication skills involve listening, speaking, observing and empathising. It is also helpful to understand the differences in how to communicate through face-to-face interactions, phone conversations and digital communications like email and social media.
Explanation:
Answer:
The definition. Communication skills enable individuals to understand others and to be understood themselves. A variety of aspects are important in the context of these skills, such as listening, speaking, observing and empathy.
Which type of nucleus decays during a radioactive decay?
a. radioactive
b. light
c. regular
d. heavy
Radioactive decay of a nucleus is common in nuclei that are heavy
What is a radioactive nucleus?A radioactive nucleus is a nucleus that decays by spontaneous disintegration. It is common in Many nuclei that have atomic number above 82.
Hence, radioactive decay of a nucleus is common in nuclei that are heavy and are capable of breaking apart.
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One mole of which substance contains a total of 6.02 x 1023 atoms? (I need help please.)
Li
NH3
CO2
02
Answer:
Oxygen
Explanation:
One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.
Analyze your results.
a. Calculate the solution concentration for each of the HCl samples. The first one has been done for you.
b. As the concentration of the HCl solution increased, did the speed of the reaction increase or decrease?
Upload your data and responses to the questions in the Analysis and Conclusions section.
WRITER
c. Therefore, as the concentration of a reactant increases, does the rate of the reaction increase or decrease?
d. Do your predictions previous to this investigation agree with your results?
e. Make a general rule about the effects of concentration of reactants on reaction rates.
#b
According to Le C ha.te llors principle of we increase concentration of reactants or products equilibrium shifts.
Yes increases#c
Rate of reaction also increases#e
Stated in b
You need to draw up oral syringes with 12.5 mg of diphenhydramine. The oral solution is available as 25 mg/10 mL. How many oral syringes can be filled from 4 ounces of solution
Answer:
24 oral syringes
Explanation:
importance of scientific learning
Answer:
scientific literacy provide essential tools for surviving in the news jungle and for responsible citizenship. They also teach us to understand our own actions, to review them critically, and to take care of our rights. This is why science education is important
Explanation:
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°c to 70.0°c when 2,520 j of heat is applied? use q equals m c subscript p delta t.. 0.00420 j/(gi°c) 0.00661 j/(gi°c) 238 j/(gi°c) 252 j/(gi°c)
The specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
How to calculate specific heat?The specific heat capacity of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature2520 = 10 × c × (70 - 10)
2520 = 600c
c = 4.2 J/g°C
Therefore, the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
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Answer:
A
Explanation:
what is 750 grams of phosphorus
The moles of phosphorous which are present in 750 grams of phosphorous is 24.27 moles.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massMoles of phosphorous which are present in 750 grams will be calculated as:
n = 750g / 30.9g/mol = 24.27 moles
Hence the resultant moles of phosphorous is 24.27 moles.
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whAT IS THE ELEMENTS FOR THE EQUATION OF DENSITY?
Answer:
Hello there! I believe the answer you need is d= M/V. Have a good day,night or miday. Sorry if I'm wrong.
When servers or sellers break state, county, or municipal alcohol laws when serving or selling alcohol, the server or seller
o is not llable; the establishment's owner will de held criminally liable.
o may be fined, but cannot face criminal charges.
will not be fined, but the establishment could lose its liquor license
When servers break state, county, or municipal alcohol laws when serving alcohol, the server could be fined and the establishment could lose its liquor license.
What is Liquor license?This is defined as governmentally issued permit for the service of alcohol in an area over a period of time.
When alcohol law is broken, there may be a fine or the revoking of the liquor license.
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What is the molarity of the resulting solution when 45.0 mL of a 1.90 M H2SO4 solution is added to 95.0 mL of 0.600 M H2SO4
When 45.0 mL of a 1.90 M H₂SO₄ solution is added to 95.0 mL of 0.600 M H₂SO₄the molarity of the resulting solution is 0.95 M.
To answer the question, we need to know what molarity is.
What is molarity of a solution?Molarity is the number of moles per unit volume with volume in liters.
To find the molarity of the resulting solution, we need to find the number of moles in each solution.
Number of moles, n = MV where
M = molarity of solution and V = volumeNumber of moles in first solution
Given that we have 45.0 mL of a 1.90 M H₂SO₄ solution.
M' = 1.90 M and V' = 45.0 mL = 0.045 L
So, n' = M'V'
= 1.90 M × 0.045 L
= 0.0855 mol
Number of moles in second solution
Given that we have 95.0 mL of 0.600 M H₂SO₄ solution.
M" = 0.600 M and V" = 95.0 mL = 0.095 L
So, n" = M"V"
= 0.600 M × 0.095 L
= 0.057 mol
Number of moles in resulting solution
The number of moles in the resulting solution is n'" = n' + n"
= 0.0855 mol + 0.057 mol
= 0.1425 mol
Volume of the resulting solution
The volume of the resulting solution is V"' = V' + V"
= 45.0 mL + 95.0 mL
= 150.0 mL
= 0.15 L
The molarity of the resulting solution
The molarity of the resulting solution is M'" = n"'/V"'
= 0.1425 mol/0.15 L
= 0.95 mol/L
= 0.95 M
So, the molarity of the resulting solution is 0.95 M.
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As the temperature increases to the ice cube's equilibrium stage, the average kinetic energy of the molecules….?
increases
decreases
remains the same
increases and then decreases
Answer:
Increase
Explanation:
if the temperature is increasing it will be slowly melting the ice causing it to turn into a liquid which will make the kinetic energy in the molecules increase.
Why do elements in the same group on the periodic table have similar
properties?
Answer:
because they possess the same number of electron at their outermost shell
4 Identify Give an example of a physical change and an example of a chemical change.
Answer:
Answer below
Explanation:
Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically
Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.
A student is making tea on a cold day. When he tries to put honey in his tea, the honey will not flow out of the bottle. Describe how the student could make the honey flow out of the bottle more easily, and explain why your method would work.
Answer:
Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle
Explanation:
15. The bird flu, also known as influenza A, is caused by a virus. Pneumonia, which can have similar symptoms to
influenza A, is caused by a bacterial infection. Which statement best summarizes the difference between these two
diseases?
O Viruses are living organisms while bacteria are not.
O Viruses are non-living organisms while bacteria are living.
O Bacterial infections are harmless to humans while viruses can be deadly.
Bacterial infections are harmful to humans while viruses can be beneficial.
WILL MARK BRAINLIST!
A chemist needs 32.0 g of phenol, C6H5OH, for an experiment. How many moles of phenol is this?
Explain how to find the molar mass of the compound.
Explain how many significant figures your answer needs to have.
The numerical answer
A chemist needs 32.0 g of phenol, for an experiment. The number of moles of phenol is 0.340 mol.
What are moles?
The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
Calculating the moles
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{32.0}{94.11} = 0.340 moles[/tex]
The molar mass can be calculated by counting the molecules of the elements. Then multiply the molecules of each element with its molar mass and then add the total number, you'll get the molar mass of the compound.
Thus, the number of moles of phenol is 0.340 mol.
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