Answer:
D
Explanation:
They are renewable energy sources
The energy is one of the major inputs for the economic development of the country. The wind and solar power can provide us with energy virtually forever. The correct option is D.
What is Renewable energy?The Renewable energy is the inexhaustible and a clean alternative to fossil fuels. Any sustainable energy source which comes from the natural environment is defined as the Renewable energy source.
The Renewable energy is formed as a result of the natural processes and continuously replenished. A few examples of Renewable energy are sunlight, water, wind and biomass.
The existence of renewable energy resources is spread over a wide geographical area as compared to the conventional energy resources. The use of renewable energy resources in energy generation results in less pollution and have great economic benefits.
Therefore the wind and solar power can provide us energy forever.
Thus the correct option is D.
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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 :)
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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What would happen if I removed a resistor from a parallel circuit? What would
happen if I removed a resistor from a series circuit? Explain in complete
sentences
Answer:
In a parallel circuit, current divides through resistors and current might be different depending upon the resistor and all resistors have the same potential difference. Therefore, if a parallel resistor was removed then the total resistance of the circuit will increase.
What is the mass in grams of 6.44 x 1023 molecules of Mgo?
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
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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Which is NOT a way to accelerate an object? *
do not disturb it
speed it up
change it’s direction
slow it down
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
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.
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
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
what does expand mean in science
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
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:
True or false gases have no mass
Answer:
Gases have mass, because they are made up molecules which have mass
In the given question, the given statement about gases have no mass is false.
The amount of substance in a thing is measured by mass, which is a physical attribute of matter. It is usually expressed in grams (g) or kilograms (kg).
Gases do have mass. The statement is false because gases consist of molecules that have mass.
Various ways can be used to determine the mass of a gas, such as weighing the container in which the gas is contained before and afterwards the gas is supplied. Additionally, the ideal gas law,[tex]\rm PV = nRT[/tex], includes the variable "n" which represents the number of moles of gas, indicating that gases do indeed have mass.Therefore, the given statement is false about gases having no mass.
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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
If it requires 75.0mL of 0.500M NaOH to neutralize 165.0 mL of an hcl solution what is the concentration of the hcl solution
Answer:
0.027 M HCl
Explanation:
The chemical equation of the neutralization is:
1 NaOH + 1 HCl -> 1 H2O + 1 NaCl
Because the ratio of NaOH and HCl is 1:1 you can use the M1V1=M2V2 formula.
(75 mL)(0.5 M NaOH) = (165 mL)(M HCl)
It requires 0.027 M HCl.
A gas occupies 900.0 mL at a temperature of 27.0°C. What is the volume if the temperature
A gas occupies 900.0 mL at a temperature of 27.0°C. What is the volume if the temperature is 105°C ?
Explanation:
[tex] \frac{V _{1} }{T _{1}} = \frac{V _{2} }{T _{2}} \\ \frac{(900)}{(27 + 273)} = \frac{V _{2}}{(105 + 273)} \\ V _{2} = \frac{340200}{300} \\ V _{2} = 1134 \: ml[/tex]
Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s) + 3F2 (g) ¬ SF6 (g) In a particular experiment, the percent yield is 79.0%. This means that a 7.90-g sample of fluorine yields __________ g of SF6 in the presence of excess sulfur.
Answer:
7
Explanation:
A 7.90-g sample of fluorine yields 7.95g of SF₆ in the presence of excess sulfur
What is the percent yield?
Percent yield is the ratio of actual yield divided by theoretical yield multiplied by 100. It gives information regarding the percentage of products formed in the reaction.
Percentage yield = Actual yield / Theoretical yield × 100
Percent yield is very important in the manufacture of products.
Percent yields are understandably less than 100%, however, percent yields greater than 100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.
Theoretical yield is the expected amount of products formed in the reaction.
Given,
Mass of Fluorine = 7.9g
Percent yield = 79%
Moles of Fluorine = mass / molar mass
= 7.9 / 38
= 0.2078
From the reaction, 3 moles of F₂ will give 1 mole of SF₆
So, 1 mole of F₂ gives 1/3 mole of SF₆
0.2078 moles of F₂ will give 1/3 × 0.2078
= 0.069 moles of SF₆
Theoretical yield of SF₆ = moles × molar mass
= 0.069 × 146
= 10.07g
Percent yield = Actual yield × 100 / Theoretical yield
Actual yield = (79 × 10.07) / 100
= 7.95g
Therefore, a 7.90-g sample of fluorine yields 7.95g of SF₆ in the presence of excess sulfur.
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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.
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:)
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
11. Which of the following hydrocarbons would you expect to have the highest boiling point?
1. ethane
2. butane
3. methyl butane
4. octane
BRAINLIEST IF RIGHT!! Write 200.0398 in 2 sig figs.
Answer:
20
step by step explanation:
_________________ is an energy resource harnessed from flowing water.
Answer:
Hydroelectric power
Explanation:
If this is wrong, i'm sorry. But, hydroelectricity is a resource harvested from rivers, which are flowing water.
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:
Help only 4 minutes left
Answer: the answer is d
Explanation: hurry and answer
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
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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Anyone know this question