Answer:
5.85 moles of carbon dioxide are created.
Explanation:
The balanced reaction is:
CaCO₃ → CaO + CO₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaCO₃: 1 mole CaO: 1 moleCO₂: 1 moleThen you can apply the following rule of three: if by stoichiometry 1 mole of CaCO₃ produces 1 mole of CO₂, 5.85 moles of CaCO₃ will produce how many moles of CO₂?
[tex]moles of CO_{2}=\frac{5.85 moles of CaCO_{3} *1mole of CO_{2} }{1 mole of CaCO_{3}}[/tex]
moles of CO₂= 5.85
5.85 moles of carbon dioxide are created.
How many Joules of energy are given off when 50 grams of water are cooled from 65-50 degrees Celsius?
3200
3138
47.83
Answer:
3200
Explanation:
because it would book it up first to evaporate it next
a toy car is place at the top of a ramp and released which situation describes how car energy is transformed
I don’t see a list of differing situations, but I can explain what happens:
Edit (to be more specific):
When you release a toy car on a ramp; the potential energy is at its highest point (with little kinetic energy). As the car accelerates downwards, kinetic energy increases. At the bottom of the ramp, there is minimum potential energy, though maximum kinetic energy.
Angela does 50 Joules of work to lift her 2.5 kg grocery bag. How far (distance) did she lift the grocery bags?
Answer the following questions when 45mL sample of 0.175 M KOH is titrated with 0.200 M HI
Find the initial pH of the 0.175 M KOH solution.
Find the pH when 18 mL of 0.200 M HI have been added.
Find the pH when 63 mL of the 0.200 M HI have been added.
How many milliliters of 0.200 M HI must be added to reach the equivalence point?
What is the pH at the equivalence point?
Answer: Initial pH is 13.243
12.83
1.3
40ml
7
Explanation:
Just finished the test.
What is the pressure of gas at 496 Liters and 200 Kelvin if the original pressure was 0.250 atm. at 300 liters and 400 kelvin?
Answer:
0.076 atm
Explanation:
Using the combined gas law formula;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
T1 = initial temperature (K)
T2 = final temperature (K)
V1 = initial volume (L)
V2 = final volume (L)
According to the information provided in this question;
P2 = ?
P1 = 0.250 atm
V2 = 496 L
V1 = 300 L
T2 = 200K
T1 = 400K
Using P1V1/T1 = P2V2/T2
0.250 × 300/400 = P2 × 496/200
75/400 = 496 P2/200
0.1875 = 2.48P2
P2 = 0.1875 ÷ 2.48
P2 = 0.076 atm
1.) What is the difference between renewable and nonrenewable resources?
2.) Explain why people need to begin using renewable resources instead of nonrenewable
resources.
Answer: 1.) renewable resources can be replenished as fast as they are used. Nonrenewable resources are unable to be replaced at the same rate at which they are used. 2.) nonrenewable energy sources will eventually run out, leaving people to figure out how to continue running their cars, homes, and busines. They must find alternative sources of energy. Since renewable energy resources that will never run out, it is a great option.
Explanation:
Prokaryotic and eukaryotic cells have many different characteristics. One difference
between prokaryotic and eukaryotic cells is that all eukaryotic cells —
Answer:
Have a nucleus
Explanation:
Pls check..
Please help, lots of points!
If you were working for a beverage company, which molarity would you recommend, and what directions for mixing would you create for the drink package? Support your claims using the data you collected.
The 1.0 M beverage solution which is mixed by stirring would be the best molarity based on the data collected.
What is a beverage?A beverage is a liquid other than water which is consumed by humans to provide the body with energy and nutrients as well as to quench thirst.
A good quality beverage is sweet, fluid and clear.
From the data in the table, the molarity that meets these criteria is 1.0 M with stirring.
Therefore, I would recommend the 1.0 M beverage solution which is mixed by stirring.
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A gas diffuses 1/6 times faster than hydrogen gas (H2).
What is the molar mass of the gas? (5 points)
a
59.95 g/mol
b
66.54 g/mol
c
68.68 g/mol
d
72.58 g/mol
Answer:
72.58 g/mol
Explanation:
mark me brainless if I am ✅
The relationship between the rate of diffusion and the molar mass is given by Graham's law. A gas diffusing 1/6 times faster than hydrogen will have a molar mass of 72.58 g/mol. Thus, option d is correct.
What is Graham's law?Graham's law states the inverse relationship between the rate of diffusion and the square root of the molar mass of the gas. It is given as,
Rate = 1 ÷ √M
The molar mass of the gas that diffuses 1/6 times faster than hydrogen is calculated as,
R₁ ÷ R₂ = √ (M₂ ÷ M₁)
Here,
The molar mass of hydrogen = M₁
The molar mass of unknown gas = M₂
Rate of diffusion of hydrogen gas = R₁
Rate of diffusion of unknown gas = R₂ = 1 / 6 R₁
Substituting values:
R₁ ÷ 1/6 R₁ = √M₂ ÷ 2
6 × 1.414
= 8.485
= 84.85 g/mol ≈ 72.58 g/mol
Therefore, option d. 72.58 g/mol is the molar mass of unkown gas.
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What does all matter have in common?
A.
It is made up of atoms.
B.
It is made up of molecules.
C.
It is all solid.
D.
It is too small to see.
El modelo atómico postulado por Shrodinger refiere la corteza atómica como una nube electrónica. Verdadero. Falso.
Answer:
Falso.
Explanation:
El modelo cuántico (no relativista) de Schrodinger, piensa a los electrones como ondas estacionarias, tal que la amplitud de dichas ondas decae muy rápidamente cuando se "alejaban" del radio atómico. (Es decir, habia poca probabilidad de que los electrones escaparan del radio atomico, y era por ello que se quedaban orbitando cerca del nucleo). Es decir, podríamos pensar en esto como una "nube de probabilidades" más que una nube electronica
La idea de nube electrónica realmente viene de modelos previos, como el de Rutherford o el de Bhor, los cuales eran modelos clásicos.
What volume in milliliters of 6.0 M NaOH is needed to prepare 175mL of 0.20 M NaOH by dilution?
Answer:
V¹N²= V²N²
here V¹= ?
N¹= 6.00
V²= 175ml
M²= 0.2M
So V¹= (V²N²)/N² = (175 x 0.2)/6
V¹ = 5.83 ml
Explanation:
Therefore diluting 5.83 ml of 6.00M NaOH to 175 m l ,we get 0.2M Solution.
5.83 ml of 6.0 M NaOH is required to prepare 175 ml of 0.20 M NaOH by dilution according to the concept of molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.For the mentioned example volume of 6 M NaOH is found out as,
M₁V₁=M₂V₂
∴V₁=0.20×175/6=5.83 ml
Thus, 5.83 ml of 6 M NaOH is required to prepare 175 ml of 0.20 M NaOH by dilution.
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If two half lives have passed since a scientist collected a 1.00- gram sample of a U-235, how much U-235 is left now?
answers for most finals chem test questions (10th)
Answer:
one quarter of the original amount, so 0.25 g
Explanation:
Answer:
C
Explanation:
Can animals and plants adapt to climate changes?
Answer:
Yes but will take a very very long time for them to adapt most will die but as gemeration passes they will get used to it
Will give brainly NEED CHEM HELP
Answer:
X is hydrochloric acid solution, Z is sodium chloride solution and Y is sodium hydroxide solution.
Explanation:
I will try be as detailed as possible.
Litmus paper:
-Short summary: Bases will turn blue and red litmus papers to blue and acids will turn blue and red litmus papers to pink while the pink will remain pink.(Simple Mnemonic: You can say B from base turns blue litmus blue and the others are the opposite).
-Also, neutral solutions will have not cause any color change on litmus papers. This is because litmus papers have a color change in the presence of H+ from acids and Oh- from bases. So, blue litmus paper remains blue and red litmus paper remains pink.
-Hydrochloric acid solution is a strong monoprotic acid because it fully dissociates to produces H+ ions. Therefore, in the presence of blue and pink litmus papers it will turn the blue to pink and the pink will remain pink.
-Sodium chloride solution is a neutral solution because it dissociates to Na+ and Cl- which do not play a role in the color change.
-Sodium hydroxide solution is a strong monoprotic base hence it fully dissociates to produce OH- no wonder the high pH value.
pH value:
-Acids have a pH value is <7 while pH of neutral solutions is 7 and basic solutions is >7.
-So from this analogy we can say that hydrochloric acid solution is 2,sodium chloride solution is 7 and sodium hydroxide solution is 10.
Universal indicator:
-A universal indicator gives a more precise data as compared to litmus because it not only identifies the type of the solution (acidic, basic or neutral) it also tells us the strength of the solution by comparing the color of the solution when the universal indicator is added against the pH universal indicator scale.
-Unfortunately ,the colors are quite a lot and I cannot type all of them but you could search for 'pH universal indicator scale' to clearly see the whole thing.
-In the scale, you can see that after addition of the universal indicator, sodium chloride solution neutral solutions (pH7) will give a green color, hydrochloric acid solution (pH=2) which is a strong acidic solution will give a red color and sodium hydroxide solution (pH=10) which is a strong base will give a blue solution.
Reaction with Magnesium:
-I'd like to recommend also that you search for 'metal reactivity' so that you can be able to see the trend .
-A highly reactive metal can displace a low reactive metal but a low reactive metal cannot displace a high reactive metal under normal conditions.
-So, for sodium hydroxide and sodium chloride solutions with magnesium ,magnesium cannot displace sodium because sodium is one of the most reactive metals therefore there will be no change.
-For hydrochloric acid solution, the reaction will take place because Magnesium is more reactive than hydrogen thus can be able to displace hydrogen ions and form Magnesium chloride solution.
~I hope this will help. All the best:)
When the temperature of the water was 10°C the waterweed did not produce bubbles.
Suzi increased the temperature of the water in the water-bath to 20°C. The waterweed started to produce bubbles.
She waited two minutes before starting to count the bubbles.
Explain why she waited for two minutes before she started to count the bubbles.
Science
Explanation:
she could waited for the saturated vapour pressure to equal the prevailing atmospheric pressure
ergo boiling to take place seeing as she had gotten the first indication that boiling had started
The picture below shows brown bears by the side of a river.
In this environment, the brown bears by the river are
Answer:
being peaceful
and washing up
Answer is C
Zeke is attempting to react a piece of magnesium metal with sulfuric acid. The sulfuric acid is a 5M solution. What could Zeke do
to slow down the rate at which the magnesium will react with the acid?
A)
increase the temperature
B)
add a 10M sulfuric acid solution
9)
add water to the acid to decrease its molarity
D)
add more of the 5M sulfuric acid to the reaction
Answer:
c)
Explanation:
add water to the acid to decrease its molarity
Which reaction demonstrates bonds breaking?
PC13(g) → P (g) + 3Cl (g)
P(g) + 3 Cl(g)
PC13 (g)
WILL GIVE BRAINLIEST PLZ HELP!!!!!!
Answer:
D
Explanation:
The picture depicts the data of the chemical, explaining that as the temperature rises, the chemical reaction rate would increase as well.
HELP! Calculate the pH of the following solutions:
a) [OH-] = 3.1x10^-8 M
pH = 7.51
pH = 3.18
pH = 8.00
pH = 6.49
pH = 3.10
b) [H3O+] = 5.2x10^-7 M
pH = 7.72
pH = 7.00
pH = 6.28
pH = 5.27
pH = 5.20
c) [OH-] = 5.9x10^-5 M
pH = 5.00
pH = 5.90
pH = 4.23
pH = 5.59
pH = 9.77
d) [OH-] = 5.9x10^-3 M
Answer:
Adding base causes the pH of a solution to increase
pH is a measure of the hydrogen ion concentration of a system. Solutions with a low pH possess a high concentration of hydrogen ions, while solutions with a high pH possess a low concentration of hydrogen ions. To increase the pH of a solution, base can be added to it. Base will release hydroxide ions (OH-) in the solution which will neutralize or reduce the H+ ions concentration in the solution. This way the pH is increased.
Explanation:
Which of the following isotopes have 8 neutrons in the nucleus?
O-15
O-17
C-13
C-14
Answer:
C-14 have 8 neutrons in the nucleus.
Carbon atoms with 8 neutrons have an atomic mass of 14 (6 protons + 8 neutrons = 14), so this isotope of carbon is named carbon-14.
hope it helps :)
Explanation:
Answer:
its d
Explanation:
edge 21
can someone help me with these pls
Answer:
C is the correct answer
Explanation:
as temperature increases the pressure also increases
Which factor will INCREASE the rate of solvation of a solid in a liquid?
A. decreasing the surface area of the solute
B. decreasing the temperature
C. allowing the mixture to sit undisturbed
D. increasing the temperature
(It’s D)
Answer:
the answer is D =decreasing the temperature ️️️
You can prepare a buffer solution by combining equal moles of which pair of substances?
A. weak acid and its conjugate base
B. strong acid and a strong base
C. strong base and its conjugate acid
D. salt and a weak acid
Answer:
A. weak acid and its conjugate base
Explanation:
A buffer solution can be made with a weak acid and conjugate base or a weak base and conjugate acid.
This may help you:
https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Acids_and_Bases/Buffers/Introduction_to_Buffers
A Chemist reacted magnesium and aluminum oxide. A reaction takes place. Explain why
Explanation:
when Magnesium is reacted with Aluminum oxide, Aluminum being a less reactive metal than magnesium, is replaced by magnesium
Al2O3 + 3Mg - 3MgO + 2Al
hence reaction takes place
A big ______ shows up on a weather map as really close/tight isobars & in weather as fast, strong winds
dewpoint
air pressure gradient
precipitation
barometer
Answer:
A BIG DI*CK
Explanation:
PLEASE HELP NEED ANSWER ASAP!!!!
Use 3 H2(g) + N2(g) <--> 2 NH3 (g) + 92.4 kJ
At equilibrium, if the hydrogen (H2) concentration is increased, the ammonia(NH3) concentration will
Select one:
a. decrease
b. shifts back and forth
c. increase
d. remain the same
Answer:
the correct answer is option A. decrease
Determine the molecular formula of the following: Molar
mass of compound equals 78.11 g/mol and an empirical
formula of CH.
NEED HELP!!
Answer:
C6H6
Explanation:
The molecular formula of a substance can be determined by using the expression:
(CH)n = 78.11g/mol
Where;
C = 12, H = 1
(12 + 1)n = 78.11
13n = 78.11
n = 78.11 ÷ 13
n = 6.008
n = 6
Hence, the molecular formula is as follows:
(CH)6
Molecular formula = C6H6
1. For the reaction below, which change would cause the equilibrium
to shift to the right?
CH,(g) + 2H,S(g) + heat --
CS,(g) + 4H,(g)
(a) Decrease the concentration of H,S.
(b) Increase the pressure on the system.
(c) Increase the temperature of the system.
(d) Increase the concentration of CS,
(e) Decrease the concentration of CH.
option c is the correct answer
because the gas there will be evolved and caused the equilibrium to shift to right side