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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2 NaOH + H2SO4 ------> 2 H2O + Na2SO4
How many grams of NaOH are required to produce 16 g H2O?
69 g NaOH
552 g NaOH
35.52 g NaOH
276 g NaOH
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:
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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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:
You are driving in a 55mph zone. If you speed up from 55 to 65, the odds of being injured in a collision:
The odd of being injured if a collision occurs as a result of increasing speed to 65 on a 55 mph road zone is 24%.
Speed limitSpeed limits are set for safety, to reduce the likelihood of crashes, and reduce the likelihood of getting injured should crashes occur.
In a report released by the National Cooperative Highway Research Program in 2006, breaching the maximum on a road with a speed limit increases the likelihood of crashes and getting injured as a result.
Specifically, increasing the speed to 65 on a road with a 55 mph speed limit increase the chances of crashes by 5% while increasing the chances of getting injured as a result by 24%.
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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
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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TRANSLATING WORD EQUATIONS:
PRACTICE ASSIGNMENT
Write balanced chemical equations for each of the following scenarios and identify the
type of reaction.
1. Liquid water added to solid calcium oxide produces aqueous calcium hydroxide.
Type:
H₂O toca (99) Call₂OH
2. Aqueous iron (III) chloride and sodium carbonate solution yields aqueous sodium
chloride and a precipitate of iron (III) carbonate.
Type:
(aq) Fe, CI H + 5 C03 SCIH -- fez coz
3. When fluorine gas is put in contact with calcium metal at high temperatures, calcium
fluoride powder is created.
Type:
F) + CF
Answer:
When calcium oxide (chemical formula: CaO) reacts with water (chemical formula: H
2
O), the following reaction takes place:
CaO+H
2
O→Ca(OH)
2
he product of this reaction is calcium hydroxide, also known as slaked lime.
Thus, when calcium oxide reacts with water, slaked lime is produced.
Calcium oxide is also known as lime and is most commonly used for many purposes. It can be used for pH correction of water or for its disinfection (with excess lime). More importantly, lime has been used for a very long time to produce calcium carbonate by reaction with carbon dioxide. Calcium carbonate has been used as mortar for sealing the gaps between bricks, stones, etc.
The reaction for the production of calcium carbonate is:
CaO+CO
2
→CaCO
3
In reality the reaction is a two-step process, with formation of slaked lime in the first step and reaction of slaked lime with carbon dioxide to form calcium carbonate in the second.
Explanation:
Consider the equations below. (1) Fe2O3(s) → 2Fe(s) 3 2 O2(g) (2) Fe2O3(s) 3CO(g) → 2Fe(s) 3CO2(g) Which equation must be added to equation (1) to produce equation (2)? Upper C upper O (g) plus one half upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g). 3 upper C upper O subscript 2 (g) right arrow 3 upper C upper O (g) plus StartFraction 3 over 2 EndFraction upper O subscript 2 (g). 3 upper C upper O (g) plus StartFraction 3 over 2 EndFraction upper O subscript 2 (g) right arrow 3 upper C upper O subscript 2 (g).
The equation is the representation of the chemical reaction. The reaction to be added to equation 1 to produce equation 2 is [tex]\rm 3\;CO\;+\frac{1}{2}\;O_2\;\rightarrow\;CO_2[/tex].
What is the chemical reaction?The chemical reaction is the change in the reactant for the formation of the product.
The given equation 1 has been:
[tex]\rm Fe_2O_3\;\rightarrow\;2\;Fe+2\;O_2[/tex]
The final reaction 2 has been:
[tex]\rm Fe_2O_3+3\;CO\;\rightarrow\;2\;Fe+3\;CO_2[/tex]
The reaction with carbon to utilize the reactant oxygen of reaction 1 forming carbon dioxide, results in reaction 2.
Thus, the reaction that must be added will be:
[tex]\rm 3\;CO\;+\frac{1}{2}\;O_2\;\rightarrow\;CO_2[/tex]
Thus, option A is correct.
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Answer:
The correct answer is C.
Explanation:
I just got it correct on EDGE
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.
Which two organisms are classified as secondary consumers?
Answer:
Carnivorous, or meat eaters for example wolves, crocodiles, eagles, piranhas and dragon fly larva
Omnivorous
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.
✓
How many grams are 1.20 x 1025 molecules of calcium iodide?
Answer:
1230
Explanation:
1.20×1025=1230 is your answer
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 moles are in 3.75 x 10^25 atoms of Tungsten?
Answer:
62.29 moles
Explanation:
See attached image
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:
if an atom has the same equal amount of electron and proton is it charged or uncharged
a flat metal surface in an electric cell is its _________ terminal
Answer:
negative
Explanation:
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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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 element is always present in an organic compound.
How many moles of potassium sulfide are there in 61. 0g.
Answer:
0.62 moles
Moles of potassium sulfide is 0.62 moles
Explanation:
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Why are noble gases called noble gases?
Answer:
comes from a translation of the German word Edelgas, which means noble gas.
Why Are Noble Gases Called Noble? The term “noble gas” comes from a translation of the German word Edelgas, which means noble gas. German chemist Hugo Erdmann coined the phrase in 1898. Like a nobleman might consider it undignified to associate with commoners, noble gases tend not to react with other elements.
Explanation:
hope it helps
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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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:)
Where is earths air the thinnest
the troposphere
the mesosphere
the stratosphere
the thermosphere
Answer:
Troposphere
Explanation:
the lowest layer of the earths atmosphere
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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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
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]
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.
