Answer:
urban heat island
Explanation:
occurs when a city experiences much warmer temperatures than nearby rural areas.
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Becquerel placed photographic paper in a drawer with some radioactive rocks and discovered that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks. True False
Becquerel did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks
What is radioactivity?The phenomenon of radioactivity was discovered by the French scientist Henri Becquerel in 1896 when he placed photographic paper in a drawer with some radioactive rocks.
We have to note that Becquerel did not discover that the amount of exposure on the paper was proportional to the amount of uranium that was present in the rocks hence the stetement is false.
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If a watershed suddenly receives a great deal of rainfall, what will happen to its wetlands and rivers?
Answer:
Depending on the actual amount of water, it's going to overfill.
Explanation:
If your watershed is already one that has a lot of water and is always filled, it's likely that your wetlands and rivers will start to overfill, causing a form of flooding.
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-No one
The release of aluminium ions as a result of acid rain is less significant in areas containing limestone rock - why?
Answer:
As it flows through the soil, acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes. The more acid that is introduced to the ecosystem, the more aluminum is released. Some types of plants and animals are able to tolerate acidic waters and moderate amounts of aluminum
Explanation:
What are the three main groups of macronutrients? (select three please)
minerals
proteins
fats
carboydrates
Answer:
protein, carbs, and fats.
Explanation:
Those are the three main sources of macronutrients.
(this isn't a chemistry, it's health)
Answer:
fats, carbohydrates and proteins
Explanation:
I don't know, I answered that on my test and it was correct
If the cell is somehow operated under conditions in which it produces a constant voltage of 1.50 V , how much electrical work will have been done when 0.487 mL of Br2(l) has been consumed
For a cell operated to produce a constant voltage of 1.50 V, the electrical work done is mathematically given as
W=2.077*10^{-7}
What is the electrical work done?Generally, the volume of Br2 is mathematically given as
[tex]Vb=\frac{0.38*3.12}{159.809}[/tex]
Vb=7.18*10^-3ml
Therefore, the quantity of charge
q=(1.436*10^-2)*9.644*10^4
q=1.385^{-4}c
In conclusion, work done
W=Eq
W=1.50*1.385^{-4}
W=2.077*10^{-7}
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How can Climate Change impact the formation of Hurricanes?
I will give brainlist
Which of the following is an example of the organic portion of the Earth’s outer layers?
Oxides
Coal
Sulfides
Carbonates
Answer:
Coal
Explanation:
Coal is derived from ancient plant life and thus consists largely of organic compounds.
The example of the organic portion of the Earth’s outer layers is coal.
What are the layers of earth?The earth is made up of many layer which are very important for human life and our planet earth.
The earth is basically made up of three different layers.
Crust - Crust is defined as a rocky planet's, dwarf planet's, or natural satellite's outermost solid shell.Mantle - Mantle is defined as the layer between the Earth's crust and the molten iron core, a thick layer of hot, solid rock.Core - The core are made up of two layer the outer core and the inner is the mantle.There are basically five layers of earth atmosphere.
TroposphereStratosphereMesosphereThermosphereExosphereThus, the example of the organic portion of the Earth’s outer layers is coal.
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What is the balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas? A. 2Zn + HCl + H+ Zn2Cl + H2 B. Zn + 2H+ 2Zn2+ + H2 C. 2Zn + 2H+ 2Zn2+ + H2 + 2e- D. Zn + 2H+ 2Zn2+ + H2 + 2e-
The balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas is as follows:
Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)
What is a redox reaction?A redox reaction is a type of chemical reaction in which some of the atoms have their oxidation number changed.
According to this question, the redox reaction between zinc and hydrochloric acid (HCl) forms zinc(II) ions and hydrogen gas. The balanced equation is as follows:
Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)
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During photosynthesis, a green plant produces 122 mL of oxygen gas at STP. What mass of glucose
(C6H12O6) is produced during this reaction?
6CO2+ 6H2O > C6H12O6+ 602
Show all steps (Answer: 0.164g)
Answer:
About 0.164 g of glucose.
Explanation:
We can determine the mass of glucose produced given the volume of oxygen gas produced with stoichiometry.
Recall that at STP, a mole of any gas occupies a volume of 22.4 L.
From the reaction, six moles of oxygen gas is produced for every one mole of glucose.
Lastly, the molecular weight of glucose is 180.18 g/mol.
Therefore:
[tex]\displaystyle \begin{aligned} 122\text{ mL O$_2$} & \cdot \frac{1\text{ L O$_2$}}{1000\text{ mL O$_2$}}\cdot \frac{1\text{ mol O$_2$}}{22.4\text{ L O$_2$}} \cdot \frac{1\text{ mol C$_6$H$_{12}$O$_6$}}{6\text{ mol O$_2$}} \cdot \frac{180.18\text{ g C$_6$H$_{12}$O$_6$}}{1\text{ mol C$_6$H$_{12}$O$_6$}} \\ \\ & = 0.164\text{ g C$_6$H$_{12}$O$_6$}} \end{aligned}[/tex]
Therefore, about 0.164 g of glucose is produced.
An ideal gas occupies 400ml at 270 mm Hg and 65°C. If the pressure is changed to 1.4 atm and the
temperature is increased to 100°C, what is the new volume?
Answer:
113 ml
Explanation:
PV = nRT remember T must be in Kelvin Volume in L
270 * .4 = n 62.4* 338.15
n = .005118
1.4 atm = 1.4 * 760 = 1064 mm
1064 * V = .005118 * 62.4 * 373.15
V = .113 l
How would you correctly prepare 125 mL of a 0.30M solution of copper(II) sulfate (CuSO4) from a 2.00M solution of CuSO4?
Answer:
see below
Explanation:
.3 M/L ( .125 L) = .0375 mole required
.0375 mole / 2 mole / l = .01875 l required
take 18.75 ml of the 2.0 solution then dilute it to 125 ml
What is the volume of hydrogen chloride under normal conditions, if its mass is 73 g?
Explanation:
36.5 g of HCl occupies 2.24×10-2m3 . ∴ 73 g of HCI at STP will occupy 2.24×10-236.5×732=4.48×10-2m3.
When liquids of a ph 5 and ph 2 mixed together, gives what ph value
Answer:
By mixing two solutions of differing pH values, the final pH of the mixed solution is going to be a function of the pH-, or the hydrogen ion (H+), of the lower pH solution, and the final volume. The hydrogen ion(H+) of the higher pH solution has little to no effect in the final pH value.
What is the product of radioactive decay 0/-1 e called?
A. An alpha particle
B. A beta particle
C. Nuclear fission
D. A gamma wave
Answer:
it represents a beta particle so the answer is B a beta particle
Answer:
The product of radioactive decay ⁰-₁e called a beta particle
B. A beta particle
Q3. Which of the following
Elements is likely to
form cations?
ง
A. Titanium (T:)
B. Carbon
C. Bromine
(Br)
) (Ar
D. Argon
Answer:
Titanium
Explanation:
titanium can form 4+ cations
Why can’t sodium metal be manufactured by the electrolysis of brine?
Answer:
Explanation:
The quick and short answer to this question is that the moment it is made into Na (the atom) the moment that happens, Na will react with water to become NaOH. Sodium is very responsive to water.
Equation
2Na + 2HOH ====> 2NaOH + H2
Which of the following is an ionic compound?
A. N2O B. CO C. HCL D. Na2O
Answer:
D. Na2O
Because we already know that sodium oxide is a binary ionic compound because it contains one metal cation and one non-metal anion.
Answer:
D. Na2O
Explanation:
Sodium oxide (Na2O) is an ionic compound. Its constituent atoms are, respectively, a metal and a non-metal.
Sodium (Na), as a metal, will attempt to lose electrons to reach an octet state. Oxygen (O2), as a non-metal, will attempt to gain electrons to reach an octet state.
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Which jobs does the respiratory system do? Select all that apply. It brings oxygen into the blood. It removes carbon dioxide waste from the blood. It pumps blood throughout the body. It takes in oxygen from air or water.
Answer:
probably the last one should hbthrbwhdee.
Answer:
it brings oxygen into the blood and removes carbon dioxide
Explanation:
Does cooking temperature affect the concentration of ethanoic acid in vinegar, measured by acid-base titration?
Yes it will.
Explanation:
At cooking temperature the concentration of ethanoic acid may be affected as the solution will boil therefore evaporating the water that will increase the concentration of acid in the solution.
Describe how you might prepare disodium phosphate given a solution of phosphoric acid, 0.500 molar and a solution of sodium hydroxide base, 0.500molar.
Explanation:
When 2 moles of sodium hydroxide (NaOH) reacts with 1 mole of phosphoric acid (H3PO4) it gives 1 moles disodium phosphate Na2HPO4 and 2 moles of water.
0.5 molar solution indicates half moles of molecules are present in per ltr solution.
to prepare disodium phosphate you need to dilute phosphoric acid solution to 0.25 molar and add equal quantity of 0.5 molar solution.
[tex]2 NaOH + H_3PO_4 \: \rightarrow \: Na_2HPO_4 + 2 H_2O[/tex]
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How moles of Cl' are in a 45 mL of 1,4 M solution of NaCl?
Answer:
.063 moles Cl-
Explanation:
To find moles multiply molarity by volume.
1.4*.045=.063 moles Cl-
Why Hydrochloric acid (HCl) is not an oxidizing agent?
please help I need proper explanation!
Answer:
Strong acids completely dissociate in water to H+ ions and extremely weak conjugate base anions.
Explanation:
its a weak acid
Answer:
because its didn't form H+ ions when react with water
2. A 0.2719 g sample containing CaCO3 reacted with 20.00 mL of 0.2254 M HCl. Given that HCI was excess. The excess HCl required exactly 20.00 mL of 0.1041 M NaOH to reach the end-point using phenolphthalein indicator. Determine percentage purity of CaCO3 in the sample. The reraction involved is CaCO3(s) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l) The titration reaction is HC(aq) + NaOH(aq) NaCl(aq) + H₂O(1)
The percentage purity of the calcium carbonate is 44%. The percentage purity gives the amount of pure CaCO3 in the sample.
What is excess titration?In excess titration or back titration, we neutralize the excess titrand left in a system.
We have the reaction;
CaCO3 + 2HCl ----> CaCl2 + H2O + CO2
Number of moles of HCl = 0.2254 M * 20/1000 L = 0.0045 moles
The reaction of the excess acid is according to the reaction;
HCl + NaOH ----> NaCl + H2O
Number of moles of NaOH = 0.1041 M * 20/1000 = 0.0021 moles
Since the reaction is 1:1, 0.0021 moles of HCl reacted also
Number of moles of HCl that reacted with CaCO3 = 0.0045 moles - 0.0021 moles = 0.0024 moles
If 2 moles of HCl reacts with 1 mole of CaCO3
0.0024 moles of HCl reacts with 0.0024 moles * 1/2
= 0.0012 moles
Mass of pure CaCO3 present = 0.0012 moles * 100 g/mol = 0.12g
Percent purity of the sample = 0.12g/0.2719 g * 100/1
= 44%
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Calculate the volume that 3.
60g H2 gas will occupy at stp
Answer:
mass over molarmass ×volume
90
What do these 2 changes have in common?
Both are only physical changes.
Both are caused by heating.
Both are chemical changes.
Both are caused by cooling.
Answer:
Both are caused by heating. Both are Chemical changes.
Explanation:
Water evaporates from the Sun's heat and is transformed into a gas. Sediment is the particles of an object. When heat hits it, it starts breaking up, or in dry cases, heating and cracking.
How many grams are in 4.25 moles of NiS?
Answer:
386.75 grams
Explanation:
You can use dimensional analysis to help you solve for this question
1. set up a proportion
x grams
4.25 mol x x mole
2. to find the amount of grams/mol that are in NiS we find the gram formula mass (mass of all the atomic masses of each element)
Ni- 59 grams
S- 32 grams
add these together and you get 91 g/mol
3. now plug in the values and multiply across
91 grams
4.25 mol x 1 mole
when you multiply across this is equal to 386.75 grams
the measured mass of a sample would have which units
Answer:
[tex]\longmapsto \: \frak[ hello \: mate ][/tex]
The measured mass of a sample would have unit as "Kilogram "
Finally, examine the atomic spectrum below. Estimate the wavelength
of each spectral line, then use that collection of wavelengths to try and
determine the identity of the element using the internet. This is the
kind of work a graduate student in chemistry might be assigned to do.
400
450
500
650
700
750
550 600
wavelength (nm)
Identity of the element
The estimated wavelengths and identities of the elements of spectral line in the given atomic spectrum is:
blue spectral line - 470 nm; Iron green spectral line - 490 nm; Magnesium yellow spectral line - 610 nm; Sodiumred spectral line - 660 nm; HydrogenWhat is an atomic spectrum?Atomic spectrum is the spectrum of frequencies or wavelengths of radiations absorbed or emitted when electrons transitions between on energyblevel to another.
The estimated wavelengths as well as identities of the elements of spectral lines shown above are as follows
blue spectral line - 470 nm; green spectral line - 490 nm; Ironyellow spectral line - 610 nm; Sodiumred spectral line - 660 nm; HydrogenTherefore, the wavelengths and colors of the spectral line in an atomic spectrum is useful in identifying elements.
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Science Task (
The transfer of thermal energy by the movement of liquids or gases is called
Convection is the movement of fluid (this can wether be liquid or gas) and as they move, they carry heat along with them.
Answer:
Convection
More info:
Heat transfers include the following: Conduction, Convection, and Radiation.
Conduction is the transfer of heat through molecules by direct contact. This takes place in the three phases of matter, but conduction works best in materials with close contact molecules of simple molecules.Convection, (definition above)Radiation is the transfer of heat through electromagnetic waves. Unlike Conduction and Convection, Radiation doesn't need matter to help with heat transfer.I am open to corrections if I accidentally included false information :).
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Based upon the chemical equation in #2 above, if 45.7g C2H4O2 are used in the reaction, how many grams of H2O will result
calcium chloride and carbon dioxide
