Answer:
computers
Explanation:
Which is NOT a way to accelerate an object? *
do not disturb it
speed it up
change it’s direction
slow it down
I can't seem to figure out how to set up charts so there's just a screenshot of the question in the file attached :) Thank's for any help!!
Answer:
See Explanation
Explanation:
Volume of base used = (31.79 - 1.6) + (32.12 - 0.98) + (42.87 -13.21)/3 = 30.34 cm3
Volume of acid used = (24.86 - 0.42) + (24.11 - 0.11) + (27.67 -3.42)/3 = 24.23 cm3
For trial 1= number of moles of HBr = 24.44/1000 * 0.3 = 0.0073 moles
For trial 2= number of moles of HBr = 24/1000 * 0.3 = 0.0072 moles
For trial 3= number of moles of HBr = 0.0089 moles
HBr(aq) + KOH(aq) -----> KBr(aq) + H2O(l)
One mole of base is required to neutralize one mole of acid.
From CAVA/CBVB =nA/nB
CAVAnB = CBVBnA
CB = CAVAnB/VBnA
CB = 0.3 * 24.23 * 1/30.34 * 1
CB = 0.24 moldm-3
number of moles of KOH = concentration * volume
number of moles = mass/molar mass
molar mass of KOH = 56 g/mol
mass/56 = 0.24 * 30.34/1000
mass = 0.24 * 30.34/1000 * 56
mass =0.408 g of KOH
Please show your work if possible!
Answer:
54.93 g/mol
Explanation:
a) the element with symbol Mn is known as Manganese and I figured it out by looking at the periodic table.
b) I took a look at the periodic table again, and seen how much the atomic mass is and from there I observed:
Mn= 54.938 g/mol
rounded is 54.94 g/mol
Using the balanced equation for the next few questions: 4 Fe(s) + 30 (9) - 2Fe2O3(s)
How many moles of Iron (11) Oxide would be produced by complete reaction of 0.15
moles of iron? (Be sure to show your work including the mole ratio you used)
Answer:
0.075 moles of iron oxide would be produced by complete reaction of 0.15 moles of iron.
Explanation:
The balanced reaction is:
4 Fe + 3 O₂ → 2 Fe₂O₃
By reaction stoichiometry (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:
Fe: 4 molesO₂: 3 molesFe₂O₃: 2 molesYou can apply the following rule of three: if by stoichiometry 4 moles of Fe produce 2 moles of Fe₂O₃, 0.15 moles of Fe produce how many moles of Fe₂O₃?
[tex]moles of Fe_{2} O_{3} =\frac{0.15 moles of Fe*2 moles of Fe_{2} O_{3} }{4 moles of Fe}[/tex]
moles of Fe₂O₃= 0.075
0.075 moles of iron oxide would be produced by complete reaction of 0.15 moles of iron.
All of the following describe the unique role of water except-
Water is polar and cannot dissolve nonpolar compounds such as oil
Water is considered a universal solvent because it can dissolve more substances than any other liquid.
Water is nonpolar and can dissolve nonpolar compounds such as oil
Water has the ability to form hydrogen bonds
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:
Which of the following correctly describes a weak acid?
O It completely ionizes.
0 It produces hydroxide ions.
O It partially ionizes.
O It produces hydronium ions that are less effective than those from strong acids.
Answer:
It partially ionizes
Explanation:
Higher tier) Weak acids only partially ionise in water. Only a small fraction of their molecules break into hydrogen ions when added to water.
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
Review the equation below.
2KClO3 Right arrow. 2KCl + 3O2
How many moles of oxygen are produced when 2 mol of potassium chlorate (KClO3) decompose?
2KClO3 --> 2KCl + 3O2
3 moles of oxygen are produced when 2 mol of potassium chlorate (KClO3) decompose.
Answer:
The answer is 3
Explanation:
I did the test on Edge
A fertilized egg, or a
, is formed from the fusion of egg and sperm.
A 35 L tank of oxygen is at 315 K with an internal pressure of 190 atmospheres. How
many moles of gas does the tank contain?
Answer:
600.7 moles
Explanation:
Applying,
PV = nRT................... Equation 1
Where P = Pressure of oxygen, V = Volume of oxygen, n = number of moles, R = molar gas constant, T = Temperature.
make n the subject of the equation
n = PV/RT............... Equation 2
From the question,
Given: P = 190 atm, V = 35 L, T = 135 K
Constant: R = 0.082 atm.dm³/K.mol
Substitute these values into equation 2
n = (190×35)/(135×0.082)
n = 600.7 moles of xygen
Which is NOT a way to accelerate an object? *
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
Explain to the people of Westfield what is in their water.
The presence of rust in the water of Westfield is the reason for the change in colour.
Reason for reddish colour of waterThe water of Westfield has reddish-brown substance. This reddish brown substance in the water is the rust which formed due to the chemical reaction between the iron pipes and the fertilizer substance present in the water.
Due to this reaction, the colour of Westfield's water is different from normal type of water so we can conclude that the presence of rust in the water of Westfield is the reason for the change in colour.
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Anyone know this question
A gas occupies a volume of 60 L at a temperature of 0.5 K. What will the volume be at 4 K?
Answer:
480 L
Explanation:
In order to solve this question, you should be familiar with gas laws. (I will attach a picture showing all of them under my answer.) In this question in particular, however, we only need Charles's Law because we're dealing with temperature and volume.
As we can see, Charles's Law is:
[tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]
or, initial volume over initial temperature equals final volume over final temperature.
In this question, 60 L is our initial volume, and 0.5 K is our initial temperature (K being Kelvin). We are only given 4 K as our final temperature. We are asked to solve for the final volume. Let's set up the equation and solve for [tex]V_{2}[/tex]:
--------------------------------------------------------------------------------------------------------------
(60) / (0.5) = [tex]V_{2}[/tex] / (4)
↓
120 = [tex]V_{2}[/tex] / 4
×4 ×4
↓
[tex]V_{2}[/tex] = 480 L
--------------------------------------------------------------------------------------------------------------
There's our answer! Feel free to comment if you have any questions about my answer :)
the kinetic theory of matter states that the atoms of a diamond are. | A. Transparent B. Always Moving C. Reflectors of light D. Extremely Hard
Answer:
Always moving!
Explanation:
matter is composed of very small atoms and molecules that are always in contant motion
2. Find the Volume of 3.00 mol of gas whose temperature is 60.0 C and whose pressure is 5.00 L.
3. Find the tempature of 1.50 mol of gas whose pressure is 4.00 atm and whose volume is 7.50L
4. Find the number of moles of a certain ideal gas whose volume, tempature and pressure are 3.00 L, 25.0, and 2.00 atm, respectively
Please show work I will give you a 5 star review and much points
Answer:
2. 16.4 L
3. 243.6K
4. 0.25mol
Explanation:
Using the ideal gas formula for the series of questions in this case, we have;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
QUESTION 2:
V = ?
P = 5 atm
n = 3 mol
T = 60°C = 60 + 273 = 333K
PV = nRT
5 × V = 3 × 0.0821 × 333
5V = 82.02
V = 82.02/5
V = 16.4 L
QUESTION 3:
P = 4 atm
V = 7.5L
n = 1.5mol
T = ?
PV = nRT
4 × 7.5 = 1.5 × 0.0821 × T
30 = 0.123T
T = 30/0.123
T = 243.6K
QUESTION 4:
P = 2.00 atm
V = 3L
n = ?
T = 25°C = 25 + 273 = 298K
PV = nRT
2 × 3 = n × 0.0821 × 298
6 = 24.47n
n = 6/24.47
n = 0.25mol
2C2H2 + 5O2 → 4CO2 + 2H2O
Which of the following statements would be correct if one mole of C2H2 was used in this reaction? (5 points)
a
One mole of oxygen was used in this reaction.
b
Five moles of oxygen were used in this reaction.
c
Four moles of carbon dioxide were produced from this reaction.
d
Two moles of carbon dioxide were produced from this reaction.
Answer:
d. Two moles of carbon dioxide were produced from this reaction
Explanation:
The given chemical reaction can be written as follows;
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
From the above chemical reaction, we have;
Two moles of C₂H₂ reacts with five moles of O₂ to produce four moles of CO₂ and two moles of H₂O
We have;
One mole of C₂H₂ will react with two and half moles of O₂ to produce two moles of CO₂ and one mole of H₂O
Therefore, in the above reaction, when one mole of C₂H₂ is used, two moles of CO₂ will be produced.
Planets X and Y orbit each other in space. Which changes would have the greatest effect on increasing the gravitational attraction between the two planets?
Group of answer choices
Halving the mass of planet X and doubling the distance between the planets
Halving the mass of planet X and halving the distance between the planets
Doubling the mass of planet X and halving the distance between the planets
Doubling the mass of planet X and doubling the distance between the planets
Answer:
halving, the mass of planet X and halving the distance between the planets
The gravitational force of attraction is the fundamental force of the universe. Doubling the mass of planet X and halving the distance between the planets increases the gravitational attraction. The correct option is C.
What is gravitational attraction?The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them. The formula of gravitational force is given as:
F = G m₁m₂ / r²
From the equation it is clear that the gravitational force increases with the increase in the mass and decreases with the increase in the distance between the objects. This law is true for each particle of matter, each particle of matter attracts every other particles.
Here doubling the mass of planet X and halving the distance between the planets increases the gravitational attractive force.
Thus the correct option is C.
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a deep underground cavern contains 2.24 x 10^6 L of methane (CH4) gas at a pressure of 15.0 atm and a temperature of 42 C. How many moles of methane does this natural gas deposit contain?
Answer:
This natural gas deposit contains 1,300,813.008 moles.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= 15 atmV=2.24*10⁶ Ln= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 42 C= 315 K (being 0 C= 273 K)Replacing:
15 atm* 2.24*10⁶ L= n*0.082 [tex]\frac{atm*L}{mol*K}[/tex]* 315 K
Solving:
[tex]n=\frac{15 atm* 2.24*10^{6}L }{0.082\frac{atm*L}{mol*K}*315 K}[/tex]
n=1,300,813.008 moles
This natural gas deposit contains 1,300,813.008 moles.
Determine the pressure inside a television picture tube with a volume of 3.50 L that contains
2.00 X 10^-5 g of nitrogen gas at 22°C.
The pressure inside the television tube containing 2×10¯⁵ g of N₂ at 22 °C is 4.94×10¯⁶ atm
How to determine the mole of fluorine gasMass of N₂ = 2×10¯⁵ gMolar mass of N₂ = 2 × 14 = 28 g/mol Mole of N₂ =?Mole = mass / molar mass
Mole of N₂ = 2×10¯⁵ / 28
Mole of N₂ = 7.14×10¯⁷ mole
How to determine the pressure Volume (V) = 3.5 LTemperature (T) = 22 °C = 22 + 273 = 295 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 7.14×10¯⁷ molePressure (P) = ?The pressure inside the television tube can be obtained by using the ideal gas equation as follow:
PV = nRT
Divide both side by V
P = nRT / V
P = (7.14×10¯⁷ × 0.0821 × 295) / 3.5
P = 4.94×10¯⁶ atm
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What is the mole fraction of ethanol (C2H5OH) in a solution of 47.5 g of ethanol in 850 g of water?
Answer:
0.021
Explanation:
that's the answer because I just did an exam that included this question and then the miss explained to me why this was the answer, but don't worry am 100% sure the answer is 0.021 .
The mole fraction of ethanol in a solution of 47.5 g of ethanol in 850 g of water is 0.021.
How we calculate the mole fraction?Mole fraction of any substance present in solution will be calculted by dividing the moles of sample to the total moles of solution.
Moles will be calculated as:
n = W/M , where
W = given mass
M = molar mass
Moles of ethanol will be calculated as:
n = 47.5g / 46.07g/mol = 1.03 moles
Moles of water will be calculated as:
850g / 18g/mol = 47.18 moles
Total moles of solution = 1.03 + 47.18 = 48.21 moles
Mole fraction of ethanol in water will be calculated as:
mole fraction = 1.03 / 48.21 = 0.021
Hence, mole fraction is 0.021.
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If you want to eat foods that contain less additives, what could you do?
A.
Stay away from packaged foods.
B.
Stay away from fresh fruits and vegetables.
Answer: the answer is a
Explanation:
always eat fresh fruits and veggiies.
Which of the following is a property of carbon atoms?
They are chemically inert.
They have six valence electrons.
They readily give up two electrons
They are found in all living things.
They are found in all living things. Hence, option D is correct.
What is an atom?An atom is any particle of matter which contains at least one proton.
Carbon is stored in plants and trees. Plants take carbon dioxide from the atmosphere to make the building blocks of food during photosynthesis. Carbon is stored in the hydrosphere and dissolved in ocean water and lakes. Carbon is used by several organisms to produce shells.
Hence, option D is correct.
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A compound formed with potassium and bromine that can detect blood in a stain by reacting with it to form distinctive crystals
Answer:
Potassium Bromide
Explanation:
not sure but i think thats it
BRAINLIEST IF RIGHT!! Write 200.0398 in 2 sig figs.
Answer:
20
step by step explanation:
COULD SOMEONE PLEASE GIVE ME THE ANSWER FOR THIS NO BOTS PLEASEEE TODAY IS THE LAST DAY FOR MISSING WORK!!!!
Answer:
:D
Explanation:
8. D. All of the above
9. C. Mechanical weathering
10. D. All of the above
Answer:
8. D
9. A
10. D
Which of the following is a base?
a. AgO
b. HF
c. Ca(OH)2
d. NaCl
Answer:
c. Ca(OH)2
Explanation:
I took the test ;)
In chemistry, bases are substances that react with an acid to yield salt. Calcium hydroxide (Ca(OH)₂) is a base as it is a hydroxide of metal. Thus, option c is correct.
What are bases?Bases are solutes that react with acidic substances to produce water and salt. It comprises substances with hydroxide ion that reacts with hydrogen ion of acid to complete the neutralization reaction.
The carbonates, oxides, and hydroxides of metals make the base that has a pH range of below 7 up to 14. The alkalinity of the substance depends on the ability to release the hydroxide ions in the solution.
Calcium hydroxide (Ca(OH)₂) is a base as it contains OH⁻ ions that are characteristic of bases. On the other hand, NaCl is salt and HF is an acid.
Therefore, Ca(OH)₂ is a base.
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At 289 K, a sample of gas has a volume of 42.0 cm3. What volume does the gas occupy at 342 K? (12.5 Points)
Answer: [tex]49.7\ cm^3[/tex]
Explanation:
Given
At temperature [tex]T_1=289\ K[/tex]
Volume is [tex]V_1=42\ cm^3[/tex]
and the temperature changes to [tex]T_2=342\ K[/tex]
At this temperature volume is [tex]V_2[/tex]
Consider Pressure remains the constant
[tex]\therefore \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\\Rightarrow V_2=V_1\times \dfrac{T_2}{T_1}\\\\\text{Insert values}\\\\\Rightarrow V_2=42\times \dfrac{342}{289}\\\\\Rightarrow V_2=49.7\ cm^3[/tex]
The volume at this temperature is [tex]49.7\ cm^3[/tex]