Answer:
What are the pros of coal energy? ans :
Huge Global Reserves.
Not an Intermittent Energy Source.
Reliable Fuel.
Inexpensive Energy Source.
Minimal Wastes, Consumable Byproducts
Smokeless Alternatives
Compatible With Other Energy Sources.
21) What is the percent by mass of bromine in the compound MgBr₂?
A) 13.2%
B) 43.4%
C) 56.6%
D) 86.8%
Answer:
D 86.8%
Explanation:
Two bromines mole wt = 2 * 79.9 = 159.8 gm (from periodic table)
Mg = 24.3 gm
159.8 / ( 159.8 + 24.3) = .868 = 86.8 %
Giving BRAINLIEST, please HELP!
Answer:
measure the final temperature of water
Radium decays to form radon. 226 88 ra → 222 86 rn 4 2 he this type of nuclear decay is called .
Answer:
alpha decay
Explanation:
Nuclear reactions accompany nuclear decay and this type of decay is alpha decay.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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what was happening to the H20 when the lines on the graph were mostly flat? What kind of energy was being added to the system?
Answer: A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it.
The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.
Water has a high boiling point because of the strong hydrogen bonds between the water molecules; it is both a strong hydrogen bond donor and acceptor.
The first change of phase is melting, during which the temperature stays the same while water melts. The second change of phase is boiling, as the temperature stays the same during the transition to gas
Explanation:
That's latent heat of vaporization.
Water boils at 100°CThe graph increases still 100°Conce it reaches boiling point it yields a straight line because of latent heat after all molecules are evaporated then the graph rises backDescribe how a metal less reactive than carbon can be reduced from its ore
Answer:
If a metal is less reactive than carbon, it can be extracted from its oxide by heating with carbon. The carbon displaces the metal from the compound, and removes the oxygen from the oxide. This leaves the metal.
Will give brainiest
Calculate the concentration of a solution of nitric acid in which 2.6g is dissolved into 2.0 L
Which of the following is NOT a function of the skeletal system?
A. Exchanges oxygen and carbon dioxide
B. Produce red blood cells
C. Protects the organs
D. Stores calcium and phosphorus
(This is a science question btw)
Answer:
D. Stores calcium and phosphorus
Explanation:
Correct me if I'm wrong
Fill in the blank.
_______ is defined as the energy of motion.
_______ is proportional to the average kinetic energy of the sample of matter.
Temperature indicates the _______ of heat flow.
Heat flows only from _______ objects to _______ objects.
The _______ scale is the absolute temperature scale where zero degrees is defined as an absolute zero.
_______ is the lowest possible temperature where no heat energy would remain in the substance and molecules and atoms would stop moving.
_______ is the net movement of particles from regions of high concentration to regions of low concentration.
The transfer of heat from a hot to a cold body would stop when _______ is reached.
_______ is the quantity of heat that a body of matter absorbs or releases when it experiences a temperature change of 1 Kelvin.
Answer:
Kinetic energy, Kelvin temperature, direction, warmer, cooler, Kelvin, Absolute zero
Explanation:
THe answers are in order and when there is a comma move to the next ______
I have two solutions : solution A has 6 moles of solute in 2 L of solvent; solution B has 6 moles of solute in 1 L of solvent . Which one is more concentrated ?
Answer:
Many people have a qualitative idea of what is meant by concentration. Anyone who has made instant coffee or lemonade knows that too much powder gives a strongly flavored, highly concentrated drink, whereas too little results in a dilute solution that may be hard to distinguish from water. In chemistry, the concentration of a solution is the quantity of a solute that is contained in a particular quantity of solvent or solution. Knowing the concentration of solutes is important in controlling the stoichiometry of reactants for solution reactions. Chemists use many different methods to define concentrations, some of which are described in this section.
Molarity
The most common unit of concentration is molarity, which is also the most useful for calculations involving the stoichiometry of reactions in solution. The molarity (M) is defined as the number of moles of solute present in exactly 1 L of solution. It is, equivalently, the number of millimoles of solute present in exactly 1 mL of solution:
molarity=molesofsolutelitersofsolution=mmolesofsolutemillilitersofsolution(4.5.1)
(4.5.1)molarity=molesofsolutelitersofsolution=mmolesofsolutemillilitersofsolution
The units of molarity are therefore moles per liter of solution (mol/L), abbreviated as MM . An aqueous solution that contains 1 mol (342 g) of sucrose in enough water to give a final volume of 1.00 L has a sucrose concentration of 1.00 mol/L or 1.00 M. In chemical notation, square brackets around the name or formula of the solute represent the molar concentration of a solute. Therefore,
[sucrose]=1.00M(4.5.2)
(4.5.2)[sucrose]=1.00M
is read as “the concentration of sucrose is 1.00 molar.” The relationships between volume, molarity, and moles may be expressed as either
VLMmol/L=L(molL)=moles(4.5.3)
(4.5.3)VLMmol/L=L(molL)=moles
or
VmLMmmol/mL=mL(mmolmL)=mmoles(4.5.4)
(4.5.4)VmLMmmol/mL=mL(mmolmL)=mmoles
Figure 4.5.14.5.1 illustrates the use of Equations 4.5.34.5.3 and 4.5.44.5.4 .
alt
Figure 4.5.14.5.1 : Preparation of a Solution of Known Concentration Using a Solid Solute
Example 4.5.14.5.1 : Calculating Moles from Concentration of NaOH
Calculate the number of moles of sodium hydroxide (NaOH) in 2.50 L of 0.100 M NaOH.
Given: identity of solute and volume and molarity of solution
Asked for: amount of solute in moles
Strategy:
Use either Equation 4.5.34.5.3 or Equation 4.5.44.5.4 , depending on the units given in the problem.
Solution:
Because we are given the volume of the solution in liters and are asked for the number of moles of substance, Equation 4.5.34.5.3 is more useful:
molesNaOH=VLMmol/L=(2.50L)(0.100molL)=0.250molNaOHmolesNaOH=VLMmol/L=(2.50L)(0.100molL)=0.250molNaOH
Exercise 4.5.14.5.1 : Calculating Moles from Concentration of Alanine
Calculate the number of millimoles of alanine, a biologically important molecule, in 27.2 mL of 1.53 M alanine.
2. Which of the following best describes temperature? *
O Number of molecules
Motion of molecules
O Size of molecules
O Type of molecules
Answer:
motion of molecules because we gonna see which one is in a solid state and what's so ever
The mass of an unidentified metal sphere is 133 grams. Students determine the
volume of the metal sphere by placing it in a graduated cylinder filled with 25
milliliters of water. The volume of the water rises to 40 milliliters when the metal
sphere is placed into the graduated cylinder. The students calculate the density
of the metal sphere in order to determine the identity of the metal using the
chart below.
What is the identity of the metal?
Aluminum
Tin
Iron
Cobalt
Given the data from the question, the identity of the unknown metal having a of mass 133 g is Cobalt
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the density Mass = 133 gVolume of water = 25 mL Volume of water + metal = 40 mL Vol of metal = 40 – 25 = 15 mL Density =?Density = mass / volume
Density = 133 / 15
Density = 8.86 g/mL
Comparing the density of the unknown metal (i.e 8.86 g/mL) with those given in the chart in the question above, we can conclude that the unknown metal is Cobalt
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Which gas is produced when Mg(s) is added to HCl(aq)?
A.
O2
B.
H2
C.
Cl2
D.
CO2
Answer:
B h2
Explanation:
Answer:H2
Explanation:
Can someone please help me? i will give brainlist
Answer:
B. Design homes that can be built on stilts where flooding is likely to occur.
C. Replace power lines that have been damaged by severe weather.
Explanation:
[tex]Hope[/tex] [tex]this[/tex] [tex]helps![/tex] [tex]:)[/tex]
There is a bell at the top of a tower that is 45m high. The bell weighs 190N (N=Newtons). The bell has potential energy. The formula for Potential energy is PE = mgh or mass x gravity x height. Gravity is 9. 8 m/s^2. What is the bell’s potential energy?
Since the bell weighs 190 N and is 45 m high, the bell’s potential energy is 8550 J
To answer the question, we need to know what potential energy is.
What is potential energy?This is energy due to position. It is given by PE = mgh where
m = mass, g = acceleration due to gravity and h = height of object.Also, W = mg = weight of object.
So, PE = Wh
The bell's potential energyNow, given that the bells weight 190 N and is 45 m high,
W = 190 N and h = 45 m.So, PE = Wh
= 190 N × 45 m
= 8550 Nm
= 8550 J
So, the bell’s potential energy is 8550 J
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Which of the following are functions of the nose?
I. Filters the air before it goes to the lungs.
II. Helps us keep our balance
III. Helps us smell different odors.
I and II
I and III
II and III
I, II, and III
Answer:
The answer should be I and III
Answer:
| and |||
Explanation:
Alice kicks a 0.25 kg soccer ball with 0.5 N of force. What force does the ball exert on Alice’s foot as she kicks it?
N
Answer:
0.5 N
Explanation:
The ball pushes back with the same force as Alice applies to it
Answer:
0.5 Newtons
Explanation:
did it on edge and got it right
explain how electronegativity plays a role in the strength of intermolecular forces
Answer:
Intermolecular Forces: Review. Electronegativity is a measure of an atom's ability to attract the shared electrons of a covalent bond to itself. If atoms bonded together have the same electronegativity, the shared electrons will be equally shared.
Explanation:
hope this helped
what is biological function?
Answer:
Biological Functions: processes and structures by which organisms adjust to short-term or long-term changes in their environment
A 2.0 l container of oxygen had a pressure of 3.2 atm. what volume would be necessary to decrease the pressure to 1.0 atm? use the formula: p1v1 = p2v2 0.625 l 0.64 l 6.4 l 64 l
The volume that would be necessary to decrease the pressure to 1.0 atm is mathematically given as
v2=6.4l
What volume would be necessary to decrease the pressure to 1.0 atm?Question Parameter(s):
A 2.0 l container of oxygen had a pressure of 3.2 atm
Generally, the equation for the is mathematically given as
P1v1=p2v2
Therefore
v2=piv1/p2
v2=2*3.2/1
v2=6.4l
In conclusion, the volume is
v2=6.4l
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Answer:
CExplanation:
4. If I have 7.7 moles of gas at a pressure of 0.090 atm and at a temperature of 56 °C, what is the volume of the container that the
gas is in?
Answer:
[tex]2.31*10^3 L[/tex] of gas are in the container.
Explanation:
1. First, convert temperature to kelvins. Otherwise, you will get the wrong answer. T = 56 + 273.15 = 329.15 K.
2.Use the ideal gas law. [tex]PV = nRT[/tex]
3.Re-arrange for volume and use the gas contstant R = [tex]\frac{0.082(L*atm)}{K*mol}[/tex]
4.Insert values. [tex]PV = nRT = \frac{(7.7 moles)(0.082 L*atm/(K*mol))(329.15K)}{(0.090 atm)} = 2.31*10^3 L.[/tex]
5. How much water would need to be added to 750 mL of a 2.8 M HCl solution to
make a 1.0 M solution?
6. If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be?
7. If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?
8. How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl?
9. I have 345 mL of a 1.5 M NaCl solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be?
10.
How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution
please help me
The values of molarity and volumes for the given questions are 2,100 mL, 0.75 M, 0.1 M, 50,000 mL, 2.07 M and 1,200 mL respectively.
What is the relation between the molarity & volume of solution?Relation between the molarity and volume of the solution will be shown by the following equation:
M₁V₁ = M₂V₂, where
M₁ & V₁ is the molarity and volume of one solution whereas M₂ & V₂ are the molarities and volume of the another solution.
Required volume of water needed to add at 750 mL of a 2.8 M HCl solution to make a 1.0 M solution will be calculated by using the above formula:V₂ = (750)(2.8) / (1) = 2,100 mL
Required molarity of diluted solution obtained on adding 25 mL of water to 125 mL of a 0.15 M NaOH solution will be calculated by using the above formula:M₂ = (0.15)(125) / (25) = 0.75 M
Required molarity of diluted solution obtained on adding 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL will be calculated by using the above formula:M₂ = (100)(0.15) / (150) = 0.1 M
Required volume of HCl of 0.05M HCl can be made by diluting 250 mL of 10 M HCl will be calculated by using the above formula:V₂ = (10)(250) / (0.05) = 50,000 mL
Molarity of the resultant solution is:M₂ = (1.5)(345) / (250) = 2.07 M
Required volume of water to add on KCl solution is:V₂ = (2.4)(500) / (1) = 1,200 mL
Hence required values of molarity and volume are 2,100 mL, 0.75 M, 0.1 M, 50,000 mL, 2.07 M and 1,200 mL respectively.
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1500 torr is how many kPa
Answer:
200 kPa
(it is actually 199.999, but rounding up it is 200)
hope this helps!
Answer:
1500 Torr is about 200 kPa
Please answer this question for me
Answer:
True.
Explanation:
Ternary acids end in -ic if the polyatomic anion ends in -ate.
Write the steps that describe the process of water changing from a solid to a liquid, and from a liquid to a gas. Helpp plsss
Answer the following questions…
1. A solution contains 4.5x10-3 M HCl. Determine the following…
a. [H3O+]
b. [OH-]
c. pH
2. A Ca(OH)2 solution ahs a pH of 8.0. Determine the following for the solution…
a. [H3O+]
b. [OH-]
c. [Ca(OH)2]
The concentration of the hydronium ion in hydrochloric acid is 0.0045 M, and the pH of the solution is 2.34.
What is pH?pH is the potential of the hydrogen or the hydronium ions in the aqueous solution.
As the solution contains [tex]4.5 \times 10^{-3} \;\rm M\;[/tex] HCl the concentration of the hydronium ion will be the same, [tex]4.5 \times 10^{-3} \;\rm M.[/tex]
The pH of the solution is calculated as:
[tex]\begin{aligned} \rm pH &= \rm -log[H^{+}]\\\\&= - \rm log (4.5 \times 10^{-3})\\\\&= 2.34\end{aligned}[/tex]
The concentration of the hydroxide ion is calculated from pH and hydronium ion as:
[tex]\begin{aligned} \rm [H_{3}O^{+}][OH^{-}] &= 10^{-14}\\\\&= \dfrac{1 \times 10^{-14}}{4.5 \times 10^{-3}}\\\\&= 2.2 \times 10^{12}\end{aligned}[/tex]
Now, for the calcium hydroxide solution, the calculations are shown as,
[tex]\begin{aligned} \rm (H_3}\rm O^{+}) &= \rm antilog (-pH)\\\\&= \rm antilog (-8)\\\\&= 10^{-8} \;\rm M\end{aligned}[/tex]
pOH is calculated as:
[tex]\begin{aligned} \rm pOH &= 14- 8 = 6\\\\\rm [OH^{-}] &= \rm antilog (-6)\\\\&= 10^{-6} \end{aligned}[/tex]
The concentration of calcium hydroxide is calculated as:
[tex]\begin{aligned} &= \dfrac{1}{2} \times \rm [OH^{-}]\\\\&= 5 \times 10^{-4} \;\rm M\end{aligned}[/tex]
Therefore, the pH and the pOH give the concentration of the hydrogen or the hydronium ion and the hydroxide ion.
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Calculate the pH of a solution with [H+] = 5.6 x 10^-8
Answer:
Approximately [tex]7.25[/tex].
Explanation:
If the concentration of [tex]{\rm H^{+}}[/tex] ions in a solution is [tex]x\; {\rm M}[/tex], the [tex]{\rm pH}[/tex] of that solution would be [tex](-\log_{10}(x))[/tex].
Note that the base of the logarithm in this calculation should [tex]10[/tex]. One way to be sure is to state the base explicitly. Using the change of base rule of logarithms:
[tex]\begin{aligned}-\log_{10}(x) = -\frac{\ln(x)}{\ln(10)}\end{aligned}[/tex].
In this question, it is implied that the concentration of [tex]{\rm H^{+}}[/tex] in the given solution is [tex]5.6 \times 10^{-8}\; {\rm M}[/tex], such that [tex]x = 5.6 \times 10^{-8}[/tex]. Using the equations above:
[tex]\begin{aligned}& \text{pH of this solution} \\ =\; & -\log_{10}(x) \\ =\; & -\frac{\ln(x)}{\ln(10)} \\ =\; & -\frac{\ln(5.6 \times 10^{-8})}{\ln(10)} \\ \approx\; & 7.25\end{aligned}[/tex].
Mercury-203 undergoes beta minus decay. 203 80 hg → 203 81 tl ? the subatomic particle produced is a(n) . 203 80 hg → 203 81 tl 0 -1 e is this the correct balanced equation? .
The correct balanced equation of a beta decay undergone by Mercury-203 is as follows:
203 80 Hg → 203 81 + 0 -1 e
What is beta decay?Beta decay in radioactivity refers to the release of a beta particle by a radioactive element.
Beta particle is characterized by the possession of mass number 0 and atomic number -1.
This means that if Mercury-203 undergoes beta decay, the atomic number of the resulting isotope will be +1 as follows:
203 80 Hg → 203 81 Tl + 0 -1 e
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Which statement describes abiotic factors in an environment? chickens run around a farm. soil retains water and nutrients. bacteria use energy to reproduce. plants compete for sunlight in an ecosystem.
Answer:
soil retains water and nutrients
Explanation:
abiotic factors
water
soil
pH
Answer: B
Explanation:
why NaCl, when dissolved in water, is an electrolyte.
Answer:
Thus is because of the it ionic nature of compound the when NaCl is dissolve in the water the Na and CL ions are free to move in the solution because of this they can conduct electricity and serves as an electrolyte
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASEGiving brainliest, please HELP!
Answer:
exothermic
Explanation:
Diagrams shows reactants.....add a little energy to get the reaction going
then energy is released and the final product has less energy ....so energy was released (heat) so this would be an exothermic reaction