Answer:
Northern region
Mechanical weathering is the set of various processes of weathering that break apart rocks into particles that can be carried away by wind and water erosion. The five major mechanisms of mechanical weathering are abrasion, crystallization of ice or certain minerals, hydration shattering, thermal fracture and exfoliation.
Which of the following is not a renewable source of energy?
1.) geothermal
2.) coal
3.) solar
4.) wind
2. Coal
It is non renewable energy source.
Answer: the answer would be coal
Explanation: hoped this helped!
During a reaction, H for reactants is -750 kJ/mol and H for products is 920 kJ/mol. Which statement is correct about the reaction and correctly compares the energy in bonds?
Answer:
a
Explanation:
the ones are stronger and herder to break so it will take more energy to break them then when they are made
The statement, that describes the reaction and correctly compares the energy in bonds from the given ΔH values is "It's endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed."
What is ΔH?The quantity of energy evolved during a chemical reaction is represented by ΔH, also known as enthalpy change.
An exothermic reaction is a chemical reaction in which heat energy is emitted. The value of ΔH is always negative in exothermic processes. An endothermic reaction is a chemical reaction that absorbs heat energy. The value ΔH of is always positive for endothermic reactions.
When the bonds in the reactants are broken, more energy is absorbed than is released when new bonds are created in the products, therefore the value of ΔH is always positive in endothermic reactions.
Hence the correct option is endothermic because the energy required to break bonds in the reactants is less than the energy released when the products are formed.
Learn more about ΔH here
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What is the mass of 2.053 moles of silver nitrate?
Answer:
Explanation:
Silver nitrate grams to moles
1 grams Silver Nitrate is equal to 0.0058867472248402 mole
Discuss whether two products are required for a chemical reaction. (NEED HELP ASAP)
Answer:
Yes.
Explanation:
"These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products."
There is a beginning product, and a reactant is needed in order for something to happen.
For example, according to Newton, something cannot happen until an exterior force comes and stops/pushes it.
Sorry if this is incorrect, I am just 4th grade :(
What some everyday ways we use nuclear power? What are the pros and cons of using nuclear power? (Three each)
Answer:
Explanation:
Pro – Low carbon. Unlike traditional fossil fuels like coal, nuclear power does not produce greenhouse gas emissions like methane and CO2. ...
Con – If it goes wrong… ...
Pro – Not intermittent. ...
Con – Nuclear waste. ...
Pro – Cheap to run. ...
Con – Expensive to build
PLZZ HELP WILL MARK AS BRAINLIESTTT!!!!!
Answer:
The object is moving with uniform acceleration
Explanation:
Acceleration is defined as the change of speed with time. Hence, we define acceleration as ds/dt.
The slope of a speed/time graph gives us the acceleration of the moving object.
An object is said to move with uniform acceleration when the speed increases by equal amounts in equal time intervals as in the straight line speed/time graph shown in the question
Consider the following reaction: 2 SO2(g) + O2(g) → 2SO3(g)
If the initial rate of change for sulfur dioxide is -2.00 M/min, what is the initial rate of change of oxygen?
A) -4.00 M/min
B) -1.00 M/min
C) 4.00 M/min
D) 1.00 M/min
Answer:
B) -1.00 M/min
Explanation:
Based on the reaction:
2 SO2(g) + O2(g) → 2SO3(g)
2 moles of SO2 are consumed per mole of O2 producing 2 moles SO3
In the problem, the sulfur dioxide has a rate of change of -2.00M/min. As the moles of oxygen that reacted are half the moles of SO2, its rate of change is halved, that is:
B) -1.00 M/minThere are 50grams of Cl2 how many molecules are produced for Cl2?
Explanation:
cl2 = 50/71
mole of cl2 = 0.704
no.of molecules = mole × avagadro no.
no of molecules = 0.704× 6.022×10²³
no. of molecules = 4.23×10²³
URGENT! What occurs during a chemical reaction. :)
A.) Atoms of two or more elements are destroyed.
B.) Atoms of two or more elements oppose one another.
C.) Atoms of two or more elements bond together.
D.) Atoms of two or more elements trade protons.
A buffer solution is prepared by adding NaC2H2O2 to a solution of HC2H2O2 (acetic acid). HC2H3O2(aq) = H+ (aq) + C2H302 - (aq) What happens if KCl is added
Answer:
pH is not been modified. No changes.
Explanation:
Our buffer is made of acetic acid, a weak one and the salt from its conjugate base, sodium acetate.
NaC₂H₃O₂ → Na⁺ + C₂H₃O₂⁻
The acetate anion can make hydrolisis in water to produce acetic acid again.
C₂H₃O₂⁻ + H₂O ⇄ C₂H₃O₂H + OH⁻ Kb
KCl is neutral salt. When we dissociate it:
KCl → K⁺ + Cl⁻
Both ions come from a strong base and a strong acid. They won't make hydrolisis in water because they are conjugate weak acid and base
K⁺ + H₂O ← KOH + H⁺
Cl⁻ + H₂O ← HCl + OH⁻
These reactions can't be possible.
That's why it doesn't occur anything in our buffer, this salt does not give OH⁻ or H⁺ to medium to modify pH
What are the basic forces that drive the water cycle? Explain what they are.
Answer:
kcgiobb jkffiob hffyio hiiddhoo hhioiv
Answer: Have a blessed day
Explanation:
Water Cycle: Component # 1. Evaporation:
Evaporation is the process where a liquid changes from its liquid state to a gaseous state. Liquid water becomes water vapour. Temperature is the primary factor for evaporation.
During the water cycle the water of the oceans and freshwater bodies, such as lakes and rivers, is warmed by the sun and evaporates. During the process of evaporation, impurities in the water are left behind. As a result, the water that goes into the atmosphere is cleaner than it was on Earth.
Water Cycle: Component # 2. Condensation:
Condensation is the opposite of evaporation. Condensation is the process where a gas is changed into a liquid. Condensation occurs when the temperature of the vapour decreases.
The water droplets formed from condensation are very small and they remain suspended in the atmosphere. There millions of droplets of suspended water form clouds in the sky or fog at ground level. Water condenses into droplets only when there are small dusts particles present around.
Water Cycle: Component # 3. Precipitation:
When the temperature and atmospheric pressure are right, the small droplets of water in clouds form larger droplets or raindrops and it is called precipitation. The raindrops fall to earth.
As a result of evaporation, condensation and precipitation, water travels from the surface of the Earth goes into the atmosphere, and returns to Earth again.
Water Cycle: Component # 4. Surface Runoff:
Much of the water that returns to Earth as precipitation runs off the surface of the land and flows down-hill into streams, rivers, ponds and lakes. Small streams flow into the ocean. Surface runoff is an important part of the water cycle because, through surface runoff, much of the water returns again to the oceans, where a great deal of evaporation occurs.
Water Cycle: Component # 5. Infiltration:
ADVERTISEMENTS:
Infiltration is an important process where rain water soaks into the ground, through the soil and underlying rock layers. Some of this water ultimately returns to the surface at springs or in low spots downhill. Some of the water remains underground and is called groundwater.
As the water infiltrates through the soil and rock layers, many of the impurities in the water are filtered out. This filtering process helps in cleaning of the water.
Water Cycle: Component # 6. Transpiration or Evapotranspiration:
This is performed by plants. As plants absorb water from the soil, the water moves from the roots through the stems to the leaves. Once the water reaches the leaves, some of it evaporates from the leaves, adding to the amount of water vapour in the air. This process of evaporation through plant leaves is called transpiration. In large forests, an enormous amount of water will transpire through leaves.
Fe2O3(s) + H2(g) = Fe(s) + H2O(l)
jenny does the experiment above and is able to produce 595 grams of iron. how many liters of hydrogen gas would she need to accomplish this?
Explanation:
[tex]molar \: mass \: of \: iron = 56 \: g \\ 56 \: g\: are \: weighed \: by \: 1 \: mole \: of \: iron \\ 595 \: g \: will \: be \: weighed \: by \: ( \frac{595}{56} ) \: moles \\ = 10.625 \: moles \: of \: iron \\ from \: equation : \\ 1 \: mole \: of \: iron \: is \: formed \: by \: 1 \: mole \: of \: hydrogen \\ 10.625 \: moles \: will \: be \: produced \: by \: (10.625 \times 1) \: moles \\ = 10.625 \: moles \: of \: hydrogen \\ at \: s.t.p : \\ 1 \: mole \: = \: 22.4 \: litres \\ 10.625 \: moles \: = (22.4 \times 10.625) \\ = 238 \: litres \\ \\ or \: at \: r.t.p : \\ 1 \: mole \: = 24 \: litres \\ 10.625 \: moles \: = \: (10.625 \times 24) \\ = 255 \: litres[/tex]
Determine how much energy is needed to change 50 g of liquid water at 100°C to steam.
13,000J
113,000J
-113,000J
-130J
Answer:
[tex]Q=113,000J[/tex]
Explanation:
Hello there!
In this case, since the vaporization process is carried out in order to turn a liquid into a gas due to the addition of heat, we can use the following heat equation involving the heat of vaporization of water or any other substance:
[tex]Q=m*\Delta _{vap}H[/tex]
Thus, since this heat of vaporization for water is 2259.36 J/g, we plug in this amount to obtain the total energy for this process.
[tex]Q=50*2259.36 J/g\\\\Q=113,000J[/tex]
Which is positive due to the necessity of heat.
Regards!
Isabella is studying the night sky. her teacher gives her an assignment. each night she is to go outside at the same time the observe the stars. on her last night of overreactions, her uncle lets her use his telescope. isabella is surprised at how many more stars she can see through the telescope. Why is it that Isabella can see so many more starts by her uncle's telescope?
Answer:
the telescope is more powerful than the human eye
Answer:
The telescope magnifies the objects and gathers light from them too.
Explanation:
I just did it on USATestPrep
metals react with ? what
Answer:
metals can react with acid, water and oxygen
What the answer I’m on a midterm and can’t seem to find it help
Answer:
Sorry I’m not rlly sure but maybe the 2nd or the last
Explanation:
9. Polar molecules tend to have_______ intermolecular forces when
compared to nonpolar molecules.
1. weaker
2. explosive
3. stronger
4.identical
Answer:
3, non polar causes the molecule to not have a twin molecule. polar just means it has a correspondent
22. Oxidation occurs when materials containing _______________________ are exposed to oxygen and water
Answer:
iron
Explanation:
iron reacts with oxygen easily causing rust to form. the haemoglobin in your red blood cells contains haem which is iron and that's how your body transfers oxygen all over
Which of the following best explains the relationship between peak to peak amplitude and semi amplitude
Answer:
Which of the following best explains the relationship between peak-to-peak amplitude and semi-amplitude? Semi-amplitude is half the distance of the peak-to-peak amplitude. Semi-amplitude is the same distance as the peak-to-peak amplitude.
which of the following examples where molecules are slightly far apart
A.rock
B.water
C.smoke
D.plasma ball
Answer:
in my opinion I think is D you don't have to choose it
uummm....In the chemical reaction 3H2 + N2 --> 2NH3 , how many moles of NH3 will be produced if 4 moles of nitrogen react?
Answer:
8moles
Explanation:
1 mole of N2 gives 2 moles of NH3
4 moles of N2 gives>( 4*2)/1
= 8moles of NH3
Given the following electronic configurations, identify how many valence electrons each atom has.
A=
Element
Electron Configuration
Number
of
Valence
Electrons
B =
C=
Sodium
(Na)
152 2s 2p 3s
А
DONE
Oxygen (0)
1s 2s 2p
B
Iron (Fe)
1s 2s 2p 3s 3p 452
306
С
Answer:
sodium=atomic number 11 it electronic configuration is ,K=2, L=8,M=1 Valence is 1
oxygen= atomic number 8 it electronic configuration is K=2, L=6 Valence is 2
iron= atomic number 26 it electronic configuration is K= 2 L= 8,M=8 N=6 Valence 2
Answer: A=1
B=6
C=8
Explanation:
URGENT: Identify the subatomic particles that determine the atomic number of an element.
Answer:
the number of protons determines the atomic number
Explanation:
Ex. Aluminum has 13 protons, so it's atomic number is 13
hope this helps :)
Question 26 (3 points)
In the lab, a cube of wood has a mass of 41.2 grams and its temperature rises from
28.1°C to 65.1°C when placed outside in the sun for a period of time. Calculate the
amount of heat absorbed by the wood. The specific heat of wood is 1.76 J/g°C.
6
Round your answer to 1 decimal place.
Your Answer:
1
Answer
units
D Add attachments to support your work
Question 27 (3 points)
Answer:
2682.9J is the heat absorbed by the wood
Explanation:
To find the heat absorbed for a material we must use the equation:
Q = S*m*ΔT
Where Q is heat absorbed in Joules
S is specific heat of the material = 1.76J/g°C for wood
m is the mass of the material = 41.2g
ΔT is change in temperature = 65.1°C - 28.1°C = 37.0°C
Replacing:
Q = 1.76J/g°C*41.2g*37.0°C
Q = 2682.9J is the heat absorbed by the wood
Which pH is the most acidic
Answers choices below
A. 7
B. 14
C. 0.5
D . 1
C. 0.5
This is the answer.
(assuming that the D option is 1, if it is 0.1 then the answer is 0.1)
[tex]0.5[/tex]
Explanation:
As you know that decreasing in the concentration of OH- (i.e., 14, 13, 12, 11,..) makes to increase in the concentration of H+ ions (5,4,3,2,1).
5) answer is A
2NaHCO3(s) + 129k) - Na2CO3(s) + H2(g) + CO2(g)
This equation indicates that AH is
and energy must be
to complete the reaction.
A)
positive; added
B)
negative; added
C)
positive; released
D)
negative; released
Answer:
A) positive; added
Explanation:
Based on the reaction:
2NaHCO3(s) + 129kJ → Na2CO3(s) + H2(g) + CO2(g)
2 moles of NaHCO3 requires 129kJ to produce 1 mole of Na2CO3, 1 mole of H2 and 1 mole of CO2.
That means, the energy must be added being, thus, an exothermic reaction. The exothermic reactions have ΔH >0.
Thus, right answer is:
A) positive; added
If you dilute 250 mL of 6.4 M lithium acetate solution to a volume of 750 mL, what will the concentration of this solution be?
HELP!! :))
I’ll give Brainliest to whoever balances the equation and says what the theoretical and percent yields are of the equation :)
35
Select the correct answer.
Which is true according to the law of conservation of energy?
A.
In a closed system, the total amount of energy in the universe keeps on changing.
B.
The supply of energy is limited, so it is essential to conserve it.
C.
In a closed system, energy can be created and destroyed.
D.
In a closed system, energy cannot be used faster than it is created.
E.
In a closed system, the total energy always remains constant.
Answer:
its a
Explanation:
In a government lab, 827 g of chlorobenzene (C6H5Cl) is reacted with 345 g of chloral (C2HOC13). If the actual yield of DDT (C14H9C15) is 464 g, then what is the
percent yield?
2C6H5CI+CHOC13 --> C14H2Cl5 + H20
Answer:
Percent yield = 55.9%
Explanation:
To solve this question we must find the moles of the reactants in order to find limting reactant. Using the chemical equation and limiting reactant we can find the moles of DDT assuming a 100% of yield (Theoretical Yield). As percent yield is:
Percent Yield = Actual yield (464g) / Theoretical Yield * 100
We can find percent yield as follows:
Moles chlorobenzene- Molar mass: 112.56g/mol-
827g * (1mol / 112.56g) = 7.35 moles
Moles chloral -Molar mass: 147.3877g/mol-
345g * (1mol / 147.3877g) = 2.34 moles
For a complete reaction of 2.34 moles of chloral are required:
2.34moles CHOCl3 * (2mol C6H5Cl / 1mol CHOCl3) = 4.68 moles Chlorbenzene. As there are 7.35 moles, Chlorobenzene is the excess reactant and chloral the limiting reactant.
The theoretical moles of DDT produced = Moles DDT = 2.34 moles. The mass is (Molar mass DDT: 354,49 g/mol):
2.34mol * (354.49g / mol) = 830g DDT = Theoretical mass
Percent yield = Actual yield (464g) / Theoretical Yield (830g) * 100
Percent yield = 55.9%