Espanola so hence 5000 sernda 50 multiplias 10
What is the ecological importance of “cobbles” in the riffle of a stream?
Answer:
it increases the amount of oxygen in the water. kind of like how people whisk stuff to make it light and airy; the cobbles incorporate air in the stream. same with any other body of water that has cobbles.
that oxygen helps the life under the water survive. fish filter oxygen in their lungs. yes, some surface for oxygen too, but it can be in the water.
How many moles of potassium sulfide are there in 61. 0g.
Answer:
0.62 moles
Moles of potassium sulfide is 0.62 moles
Explanation:
please mark me as brainlist
Investigate the water in the pool during evernight.
Answer:
Either you didn't put the full question or your posting something you have to do in a pool
Explanation:
How many mL of 2.5 M K2SO4 are required to obtain 1.25 grams of the compound?
2.87mL of 2.5 M K2SO4 are required to obtain 1.25 grams of the compound.
HOW TO CALCULATE VOLUME?The volume of a substance can be calculated by dividing the number of moles of the substance by its molarity. That is;
volume = no. of moles ÷ molarity
According to this question, 2.5M K2SO4 are required to obtain 1.25 grams of the compound. The volume can be calculated as follows:
Molar mass of K2SO4 = 174.26 g/mol
moles of K2SO4 = 1.25g ÷ 174.26g/mol
moles of K2SO4 = 0.00717moles
Volume = 0.00717moles ÷ 2.5
Volume = 0.00287 L = 2.87mL.
Therefore, 2.87mL of 2.5 M K2SO4 are required to obtain 1.25 grams of the compound.
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Mechanical waves travel best through a
medium while electromagnetic waves
travel best through a
A. vacuum
B. solid
C. liquid
D. gas
[tex]\huge{\color{magenta}{\fcolorbox{magenta}{black}{\huge{\color{white}{\fcolorbox{aqua}{black}{✿ᴀɴsᴡᴇʀ✿}}}}}}[/tex]
vaccum
Explanation:
vaccum is your answer
I hope you help
While playing soccer, Carla slides across one of the lines on the field. When she stands up, what base does she dust off? calcium hydroxide ammonium hydroxide zinc hydroxide potassium hydroxide.
The soccer field has been placed with the outlines of the slaked lime. The chemical dust off from the falling has been calcium hydroxide.
What is slaked lime?The boundary wall to the soccer or the other field has been marked with slaked lime powder. The chemical has the ability to react with bacteria and act as a disinfectant.
The slaked lime chemically is a white powder of calcium hydroxide. Thus, after falling on the soccer field, the chemical dusted off by Carla is calcium hydroxide. Thus, option A is correct.
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Answer:
the is A or calcium hydroxide
Explanation:
i got this right just now since i took the test:)
Mention 20 products of carbon
Answer:
1. Diamonds
2. Graphite
3. Textiles
4. Life Itself
5. Coal
6. Graphene
7. Carbon Dioxide
8. Coca-Cola
9. Paintball Guns
10. White dwarf stars
11. Oil
12. Gasoline
13. Curede oil
14. Wood (almost all fibers used for clothes contain carbon, as they are either proteins from animals/plants, or they are plastics.)
15. Acetic acid.
16. Acetylene.
17. Benzeze.
18. Carbon dioxide.
19. Carbon disulfide.
20. Carbon monoxide.
The danger from radon gas would most likely be greatest in:.
The danger from radon gas would most likely be greatest in well-insulated homes. It is a toxic gas.
What is radon gas?Radon is a naturally radioactive gas generated from different elements such as uranium or radium.
Radon is generated when these radioactive materials naturally decompose in the soils and/or rocks.
Radon is highly toxic and therefore this gas must be avoided to maintain healthy conditions in a home.
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What could humans do to make enough oxygen to survive?
Answer:
We could plant more trees :)
Explanation:
Trees producer oxygen AND absorb carbon dioxide, something our earth has too much of, thanks to humans
HELP ASAP!! BRAINLIEST!! If you added a 15.00 piece of solid Cu to an aqueous solution of silver nitrate, the silver would be replaced in a single replacement reaction forming aqueous copper(II) nitrate and solid silver. How much silver is produced if 15.00 g of Cu is added to the solution of excess silver nitrate?
1. Determine the moles of Ag produced:
2. Convert moles Ag to grams of Ag produced:
Which property of matter is best measured using the tool shown?
A. Reactivity
B. Volume
C. Mass
D. Ductility
Answer: B volume
Explanation: that tool is used to measure volume or liquid
Answer:
B. Volume
Explanation:
test
Binary covalent compounds can be named as a function of what?
A. increasing period number
B. decreasing group number
C. increasing group number
D. octet rule
Answer:
Binary molecular (covalent) compounds are formed as the result of a reaction between two nonmetals.
Binary covalent compounds which have slight difference in their electronegativities can be named as a function of the octet rule.
What are covalent compounds?
Covalent compounds have covalent bonds which is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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How many moles are in 3.75 x 10^25 atoms of Tungsten?
Answer:
62.29 moles
Explanation:
See attached image
A solution is prepared by dissolving a
certain amount of solute in 500 g of
water. The percentage by mass of a
solute in a solution is 2.38. Calculate the
mass of solute
Answer:
119g
Explanation:
Just multiply
2.38% of 500 =
119 g
solution = solute + solvent
% mass of solute:
[tex]\tt \dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
for % mass of solute = 2.38%, then mass of solute:
[tex]\tt =2.38\%\times 500~g=\boxed{\bold{11.9~g}}[/tex]
50 POINTS PLEASE HELO ME
Answer:
128g
Explanation:
Simply multiply the number of moles by the molar mass of each substance (64 g/mol for SO2 and 32 g/mol for 02):
SO₂ → 2 moles × 64 g/mol =128g
O₂ → 1 mole x 32 g/mol =32g
Which two organisms are classified as secondary consumers?
Answer:
Carnivorous, or meat eaters for example wolves, crocodiles, eagles, piranhas and dragon fly larva
Omnivorous
Explain the food webs and food pyramids in your own words
Answer: This is the most basic method of showing feeding relationships. A food web is indeed a following diagram multiple food chains, relationships, and connections. Food pyramid: Often known as an energy pyramid, a food pyramid takes the food chain and extends it to the transfer of energy within a community.
Explanation:
What do grace Lins stories show readers about heroes?
Answer:
that anyone can be a hero if they put their mind to it
Answer:
Heroes come from many cultures
Explanation:
i got it right
How many moles of water can be produced if 8 moles H2 are used?
The number of moles of water that would be produced will be 4 moles
Stoichiometric calculationsFrom the balanced equation of the reaction:
2H2 + O2 ---------> 2H2O
Mole ratio of H2 and H2O = 2:1
Mole of H2 = 8 moles
Equivalent mole of H2O = 8/2
= 4 moles
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Difference between magnesium oxide and magnesium citrate.
Explanation:
Magnesium citrate is the best absorbed form while Magnesium Oxide is not. Magnesium (Mg) Oxide is the most poorly absorbed form.
✓
Do now:
Explain the process in which igneous rocks are formed?
(Middle School Science 8th Grade)
Answer:
form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.
Explanation:
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In these chemical compounds, c is for carbon, o is for oxygen, n is for nitrogen, and k is for potassium. Which chemical compound is organic?.
Answer:
carbon because organic compounds are made up of hydrogen and carbon
How many grams are 1.20 x 1025 molecules of calcium iodide?
Answer:
1230
Explanation:
1.20×1025=1230 is your answer
a flat metal surface in an electric cell is its _________ terminal
Answer:
negative
Explanation:
What amount of nacl (in moles) is required to prepare 250 cm3 of a 0.200 mol dm-3 solution?
Answer:
V = 250 cm3
= 250 × 10^(-3) dm3
= 1/4 dm3
no. of mole = 0.2×1/4 mol
= 0.05 molExplanation:
Total , 0.050 moles of sodium chloride (NaCl) is required to prepare 250 cm³ of a 0.200 mol/dm³ solution.
To calculate the amount of NaCl (sodium chloride) in moles required to prepare a 0.200 mol/dm³ solution in a volume of 250 cm³, you can use the formula:
Amount of substance (in moles) = Concentration × Volume
Given:
Concentration (C) = 0.200 mol/dm³
Volume (V) = 250 cm³
First, convert the volume to dm³:
Volume (V) = 250 cm³ = 250/1000 dm³
= 0.250 dm³
Now, use the formula to calculate the amount of NaCl in moles:
Amount of NaCl = Concentration × Volume
Amount of NaCl = 0.200 mol/dm³ × 0.250 dm³
Amount of NaCl = 0.050 moles
Therefore, 0.050 moles of NaCl is required to prepare 250 cm³ of a 0.200 mol/dm³ solution.
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Where is earths air the thinnest
the troposphere
the mesosphere
the stratosphere
the thermosphere
Answer:
Troposphere
Explanation:
the lowest layer of the earths atmosphere
The equation for the pH of a substance is pH = –log[H ], where H is the concentration of hydrogen ions. A basic solution has a pH of 11. 2. An acidic solution has a pH of 2. 4. What is the approximate difference in the concentration of hydrogen ions between the two solutions?.
The approximate difference in the concentration of hydrogen ions between the two solutions is 8.7.
What is pH?
pH is the measure of how acidic and basic a liquid is. The full form of pH is potential hydrogen.
By the formula of pH
pH = -log [H +]
[tex][H^+] = 2 \times 10 ^ -^9[/tex]
[tex]pH = -log (2 \times10 ^ -^9)[/tex]
pH = 8.7
Thus, the pH difference is 8.7.
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For the reaction A(g)
* 2B(g) the
following concentrations where measured
at 25°C. The Kc for this temperature is 1
Is the reaction at equilibrium?
[A] = 4 M
[B] =2 M
Answer:
Yes
Explanation:
By definition, the equilibrium constanct, Kc, for the reaction A ⇒ 2B is
= [A]^1 / [B]^2
Substitute [A] = 4 and [B] = 2 in the equation,
[A]^1 / [B]^2
= 4^1 / 2^2
= 1
= Kc
So yes the reaction is at equilibrium.
Let's find K_c
[tex]\\ \rm\Rrightarrow K_c=\dfrac{[B^]^2}{[A]^1}[/tex]
[tex]\\ \rm\Rrightarrow 1=\dfrac{2^2}{4}[/tex]
[tex]\\ \rm\Rrightarrow 1=\dfrac{4}{4}[/tex]
[tex]\\ \rm\Rrightarrow 1=1[/tex]
Yes it's at equilibrium
1.33 dm3 of water at 70°C are saturated by 2.25
moles of lead(II) trioxonitrate(V), Pb(NO3)2, and
1.33 dm3 of water at 18°C are saturated by 0.53
mole of the same salt\If 4.50 dm3 of the saturated
solution are cooled from 70°C to 18°C, calculate
the amount of solute that will be deposited in
(a) moles,
(Pb = 207, N = 14,0 = 16)
(b) grams.
Given that 4.50 dm³ of Pb(NO₃)₂ is cooled from 70 °C to 18 °C, the
amount amount of solute that will be deposited is 1,927.413 grams.
How can the amount of solute deposited be found?
The volume of water 1.33 dm³ of water 70 °C.
The number of moles of Pb(NO₃)₂ that saturates 1.33 dm³ of water at 70 °C = 2.25 moles
At 18 °C, the number of moles of Pb(NO₃)₂ that saturates 1.33 dm³ of water = 0.53 moles
Therefore;
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 70 °C is therefore;
1.33 dm³ contains 2.25 moles.
[tex]Number \ of \ moles \ in \ 4.50 \ dm^3 = \dfrac{2.25}{1.33} \times 4.50 \approx \mathbf{7.613 \, moles}[/tex]
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 70 °C ≈ 7.613 moles
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 18 °C is therefore;
1.33 dm³ contains 0.53 moles
[tex]Number \ of \ moles \ in \ 4.50 \ dm^3 = \dfrac{0.53}{1.33} \times 4.50 \approx \mathbf{1.79 \, moles}[/tex]
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 18 °C ≈ 1.79 moles
The number of moles that precipitate out = The amount of solute deposited
Which gives;
Amount of solute deposited = 7.613 moles - 1.79 moles = 5.823 moles
The molar mass of Pb(NO₃)₂ = 207 g + 2 × (14 g + 3 × 16 g) = 331 g
The molar mass of Pb(NO₃)₂ = 331 g/mol
The amount of solute deposited = Number of moles × Molar mass
Which gives;
The amount of solute deposited = 5.823 moles × 331 g/mol = 1,927.413 g
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if an atom has the same equal amount of electron and proton is it charged or uncharged
