Answer:
phosphorous
Explanation:
A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements. Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.
Aqueous potassium chloride will react with which one of the following to form a precipitation reaction?
copper (II) nitrate
sodium chromate
ammonium phosphate
lead (II) chlorate
Answer:
lead (II) chlorate
Explanation:
precipitate means not soluble in water
potassium chlorate is not very soluble in water, it precipitates and may be collected by filtration
lead(II) chloride can be made as a white precipitate by adding a solution containing chloride ions to lead(II) nitrate solution
thoughtcocom chemguidecouk
What are the spectator ions in the
following reaction?
NiS (s) + 2HCl(aq)
NiCl₂(aq) + H₂S(g)
B
S²-
CIT
Answer:
S
Explanation:
How can professionals increase their levels of stress as a result of personal work habits?
Working at a steady rate
Developing work ethics
Procrastinating
Setting personal goals
Answer:
A
Explanation:
Developing work ethics won't lower your stress although it may make your conscience a little happier. Not B
Not C. Procrastinating just makes things harder. The mountain of things to do is not diminishing at all and your stress knows it.
Not D. Although D is the second best answer, setting goals is not really an action. It is a plan for how to work. But it is not work. Still having a goal is useful.
The answer is A. Just keep hitting what you have to do at a steady pace.
The overall equation for the electrolysis of aluminium oxide is:
2Al2O3
4Al + 302
Calculate the mass of oxygen produced when 2000 kg of aluminium oxide is
completely electrolysed.
Relative atomic masses (A):
O = 16
Al = 27
941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.
What is electrolysis?Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.
The mass of aluminium oxide Al₂O₃ = 2000 kg = 2000 000 g
Molar mass of Al₂O₃ = 101.96 g/mol
no of moles = [tex]\frac{mass }{ molar \;mass}[/tex]
no of moles of Al₂O₃ = [tex]\frac{2000 000 g}{101.96 g/mol}[/tex]
no of moles of Al₂O₃ = 19615.4 mol
From the reaction:
4Al + 3O₂ ⇒ Al₂O₃
To determine the moles of O₂ in Al₂O₃:
Then;
19615.4 mol X [tex]\frac{3}{2}[/tex] mol of O₂ = 29423.1
The mass of oxygen now = 29423.1 × 32 g
= 941539.2 g
Hence, 941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.
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Under which conditions the temperature and pressure is a gas most soluble and water
We know
[tex]\\ \rm\Rrightarrow S\propto T[/tex]
Higher the temperature higher the solubilityAccording to gay lussac's law
[tex]\\ \rm\Rrightarrow P\propto T[/tex]
If temperature is high pressure is also highSo our answer is high pressure and high temperature
What is the active element in most photovoltaic cells?.
Answer:
if you mutliply 8x2 it would be 16 and half of 16 is 8 and if you multiply that by 2 you get 16 again and then if you multiply that by 2 it comes out to 32 then devide that by 2 and you get 16 then divide again and you get 8
Explanation:
Answer:
silicon is the most common semiconductor used in computer chips
Which of the following liquids would turn
blue litmus paper red?
1. orange juice
2. milk of magnesia
3.
distilled water mixed with a little baking soda
4. oven cleaner
Answer:
orange juice because it a type of acid.
Atoms with certain characteristics are radioactive. Which of those below will
always be radioactive?
A. all atoms with more neutrons than protons
B. all atoms with an atomic number under 83
C. all atoms with fewer neutrons than protons
D. all atoms with an atomic number over 83
For a given voltaic cell, you double the concentrations of all soluble components to 2.0 M instead of the standard 1.0 M. All other conditions are standard. What happens to the cell emf
If the concentration of the solutions are doubled then the cell EMF is also doubled.
Nernst equationAccording to the Nernst equation, the concentration of the species determines the cell EMF as we can see form the formula;
Ecell = E°cell - 0.0592/nlogQ.
Hence, if the concentration of the solutions are doubled then the cell EMF is also doubled.
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When liquid bromine is cooled to form a solid, which of the following types of solid would it form?.
Answer:
If liquid bromine is cooled to form a solid, which type of solid does it form? Brass is made by melting copper and zinc and physically mixing them. As this alloy is cooled, it forms a solid where the copper and zinc are not chemically bonded together.
Explanation:
freshwater is distributed in both time and space
Can someone please help me?
D. Petroleum
Answer:
Water and plastic
Explanation:
The other two dont make as much sense
Equation Unbalanced : __AlCl3 + __F2 --> __AlF3 + __Cl2
When 4.00g of flourine reacts with excess aluminum chloride, how many grams of chlorine gas are produced? First balance the equation.
[tex]\\ \rm\Rrightarrow 2AlCl_3+3F_2\longrightarrow 2AlF_3+3Cl_2[/tex]
Balanced3mols of fluorine produce 2 mol chlorine
1 mol fluorine produces 2/3=0.6mol chlorine
Moles of fluorine gas=
4/190.2mol.approxMoles of chlorine:-
0.2(0.6)=0.18molMass of chlorine
71(0.18)12.78gDescribe how you would make 6.0 L of a 0.100 M KCl solution from a 4.0 M stock KCl solution.
Answer:
0.15 l of 4.0 m stock KCl solution should betaken
Explanation:
N1V1=N2V2
6*0.1=V2*4
V2=0.15L
Match the molecules below with their functions:
Answer:
MAC: Assembly of the MAC leads to pores that disrupt the cell membrane of target cells, leading to cell lysis and death
Interferons: Stimulates the infected cells and those nearby to produce proteins that prevent the virus from replicating within them
Cytokines: Molecular messengers between cells
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What are some downsides to fossil fuels? (Select all that apply.) pls help im timed
They are expensive to extract compared to other forms of energy.
They release large amounts of carbon dioxide when burned.
They do not replenish themselves.
They are in a limited supply.
Answer:
B, C and D
Explanation:
Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.
Although fossil fuels are continually formed by natural processes, they are classified as non-renewable resources because they take millions of years to form.
fossil fuels, are called nonrenewable, which means they have a limited supply and are not continuously being made or they are made very slowly
Which of the following describes a characteristic of water that helps it in dissolving a wide range of chemicals and biomolecules? (5 points)
It has a partial negative charge on oxygen and a partial positive charge on hydrogen.
It has a linear molecular structure with H-O-H arranged in a straight line.
It requires a high amount of heat to raise or drop its temperature.
It has completely non-polarized O-H bonds.
¤ As water has the ability to form hydrogen bonds which makes it an excellent solvent.
¤ For this ability of water it can dissolve many different kinds of molecules.
Hope it helpswhat is the molar mass of sodium chloride
Answer:
58.44 g/mol
hope it helps :)
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Which of the following will lose 2 electrons to become stable?
Answer:
Magnesium,Berillium,
Explanation:
they they belong to group II
The volume of a gas collected when the temperature is 11. 0°c and the pressure is 710 mm hg measures 14. 8 ml. What is the calculated volume of the gas at 20. 0°c and 740 mm hg?.
Answer:
Original: P₁ = 710 mmHg, V₁ = 14.8 mL, T₁ = (273.2 + 11.0) K = 284.2 K
New: P₂ = 370 mmHg, V₂ = ? mL, T₂ = (273.2 + 20.0) K = 293.2 K
Combined gas law: P₁V₁/T₁ = P₂V₂/T₂
Then, V₂ = V₁ × (P₁/P₂) × (T₂/T₁)
Calculated new volume, V₂ = (14.8 mL) × (710/370) × (293.2/284.2) = 29.3 mL
What is the solvent for a solution made by dissolving sodium chloride into water?
O water
o sodium chloride
O chloride
O sodium
it is water because it is dissolving the sodium chloride
Determine the energy released per kilogram of fuel used. given mev per reaction, calculate energy in joules per kilogram of reactants. consider 1 mole of tritium plus 1 mole of deuterium to be a mole of "reactions" (total molar mass = 5 grams).
The energy released in nuclear reactions are far larger than that released in chemical reactions due to the release of nuclear energy from the nucleus.
Why is the energy released in a reaction?Energy is released in a reaction due to the breaking of bonds are well as formation of bonds.
The quantity of energy released in reactions differs according to the reaction type involved.
When compared to chemical reactions, the energy released in nuclear reactions are very much higher because of the changes that occurs in the nucleus of the atoms involving nuclear energy.
The energy, E released in nuclear reactions is given by the formula below:
[tex]E = mc^{2}[/tex]
where m is the mass of the substance and c is the speed of light.
Therefore, the energy released in nuclear reactions are far larger than that released in chemical reactions.
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Answer:
3.39 x 1014 J/Kg
Explanation:
what are the ways to manage wastes.
Explanation:
1. Measure your waste
It is easier to manage and track your improvement on something that is measured. Start by recording the types and quantities of waste materials generated within your business.
This could just be a quick visual assessment and estimation of amount and types of waste per week. As you change how you manage your waste, you can compare and see what difference your changes make to the amount of waste disposed to landfill.
2. Reduce
To reduce the amount of waste going to landfill, consider:
can waste be avoided or reduced by the way you procure goods and services or by changing your business operations?
does another local business have a use for the waste materials produced by your business?
what materials can be targeted for recycling?
3. Recycle
Find out what options are available locally for business recycling.
4. Collection services
It is a good idea to find out how levy fees will be managed by your waste service provider, and find out more about your waste collection services—how it impacts your ability to recycle and what options are available to you.
5. Separating waste
It’s important to ensure that waste is correctly separated for recycling. Putting the wrong waste in contaminates the recycling. Check out the free-to-download recycling signage to help businesses communicate correct recycling and waste separation behaviours.
Which of these solutions is the most basic?
Your answer:
[OH-] = 4.3 x 10-9 M
[OH-] = 2.8 x 10-11 M
[OH-] = 6.7 x 10-10 M
[OH-] = 1.0 x 10-5 M
Which of these solutions is the most basic?
[OH-] = 4.3 x 10-9 M
[OH-] = 2.8 x 10-11 M
[OH-] = 6.7 x 10-10 M
[OH-] = 1.0 x 10-5 M
Answer↷[OH-] = 1.0 x 10-5 M ✓ Solution↷[OH-] = 4.3 x 10-9 M
[OH-] = 4.3 x 10^-9 MpOH = - log [OH^1-]pOH = - log [4.3 x 10^-9]pOH = 8.36pH = 14- 8.36pH = 5.64_______________________________________
[OH-] = 2.8 x 10-11 M
[OH-] = 2.8 x 10^-11 MpOH = - log [OH^1-]pOH = - log [2.8 x 10^-11 ]pOH = 10.55pH = 14-10.55pH = 3.45_______________________________________
[OH-] = 6.7 x 10-10 M
[OH-] = 6.7 x 10^-10 MpOH = - log [OH^1-]pOH = - log [6.7 x 10^-10]pOH = 9.17pH = 14-9.17pH = 4.83_______________________________________
[OH-] = 1.0 x 10-5 M
[OH-] = 1.0 x 10-5 M pOH = - log [OH^1-]pOH = - log [1.0 x 10^-5 ]pOH = 5pH = 14-5pH = 9_______________________________________
we know that , the solution with pH > 7 is termed as basic and more the pH ,more the basicity, hence ,the solution with the highest pH would be the strongest base out of these all which is
[OH-] = 1.0 x 10-5 M with pH = 9
_______________________________________
Note the rule
pOH=-log[OH-]And we can find the answer through logarithm rules basic
loga^b=blogaSo
-log10^-n=nHigher the n higher the pOH
But
pH=14-pOHLesses pOH=Higher pH i.e basic HighAs we can see
Option D has least n (5)
Hence D is more basic
When the limiting reactant in a chemical reaction is completely used, the.
Answer:
The limiting reagent is the reactant that is used up completely. This stops the reaction and no further products are made. Given the balanced chemical equation that describes the reaction, there are several ways to identify the limiting reagent.Explanation:
2(NH4)₂Cr₂ What are the names of the atoms make up the above formula?
Answer:
Nitrogen, Hydrogen, Chromium
Explanation:
N= Nitrogen
H= Hydrogen (it is not helium because helium is "He")
Cr= Chromium
What aspect of water makes it favorable to use in steam distillation?.
Answer:
The low molecular weight of water makes water a favorable liquid for steaming
Describe the trends in atomic radii by checking the correct box. atomic radii from the left to right across a period tend to: increase. decrease. atomic radii from the top to the bottom of a group tend to: increase. decrease.
Answer:
1st is decrease
2nd increase
Explanation:
I just did it
Answer:
1. Decrease 2. Increase
Explanation:
Edge 2023
what two types of ions do oysters need to form shells
P32 is a radioactive isotope with a half-life of 14.3 days. If you currently have 17.5 g of P32 , how much P32 was present 9.00 days ago
Answer:
27.07 gm nine days ago
Explanation:
17.5 = x (1/2)^9/14.3
x = 27.07 gm