Answer:
the correct answer is argon: 1s 2^2s 2^2p 6^3s 2^3p^6
Explanation:
In the equation E = mc2, what does c represent?
Answer:
c is the speed of light
Explanation:
E: energy
m: mass
c2: speed of light squared
A farmer wants to start growing sweetcorn on his farm. He has found out that sweetcorn grows best in soil with a pH value of approximately 7.5. Explain how he can use the knowledge of acids, alkalis, and neutralisation to find out the pH value of his soil to make sure he gets the best crop possible
Answer:
The process to use this knowledge is explained as below:
Explanation:
1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.
2. If the field or the farm has alkali soil add acid to reduce the pH value.
3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.
4. It will be a neutralization reaction and changes the pH value of the farm.
5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.
6. The pH value will need to be regularly monitored and adjusted.
What is the net ionic charge of a calcium ion?
Answer:
Ca generally loses two electrons from its outer shell to form a Ca2+ ion.
Oxidation often removes ...?
Answer:
Electrons.
Explanation:
Answer:
oh yes chemical oxidation removes
Explanation:
but i m not sure hope it is right i haven't looked book this time
Please help me with number 12
Answer:
organisms in rain water and the number of organisms in pond water because the dependant variable never changes
Explanation:
because the dependant variable never changes
NiS2(s) + O2(g) --> NiO(s) + SO2(g) When 11.2 g of NiS2 react with 5.43 g of O2, 4.86 g of NiO are obtained. The theoretical yield of NiO is Blank 1 , the limiting reactant is Blank 2 and the percent yield is Blank 3 %.
Answer:
1. The theoretical yield of NiO is 5.09g.
2. O2 is the limiting reactant.
3. The percentage yield of NiO is 95.5%
Explanation:
Step 1:
The balanced equation for the reaction is given below:
2NiS2(s) + 5O2(g) —> 2NiO(s) + 4SO2(g)
Step 2:
Determination of the masses of NiS2 and O2 that reacted and the mass of NiO produced from the balanced equation. This is illustrated below below:
Molar mass of NiS2 = 59 + (32x2) = 123g/mol
Mass of NiS2 from the balanced equation = 2 x 123 = 246g
Molar mass of o3= 16x2 = 32g/mol
Mass of O2 from the balanced equation = 5 x 32 = 160g
Molar mass of NiO = 59 + 16 = 75g/mol
Mass of NiO from the balanced equation = 2 x 75 = 150g
Summary:
From the balanced equation above, 246g of NiS2 reacted with 160g of O2 to produce 150g of NiO
Step 3:
Determination of the limiting reactant. This can be obtain as follow:
From the balanced equation above, 246g of NiS2 reacted with 160g of O2.
Therefore, 11.2g of NiS2 will react with = (11.2 x 160)/246 = 7.28g of O2.
From the above calculation, we can see that it will take a higher mass of O2 i.e 7.28g than what was given i.e 5.43g to react completely with 11.2g of NiS2.
Therefore, O2 is the limiting reactant and NiS2 is the excess reactant.
1. Determination of the theoretical yield of NiO.
In this case, the limiting reactant will be used as all of it is consumed in the reaction. The limiting reactant is O2.
From the balanced equation above, 160g of O2 reacted to produce 150g of NiO.
Therefore, 5.43g of O2 will react to produce = (5.43 x 150)/160 = 5.09g of NiO.
Therefore, the theoretical yield of NiO is 5.09g.
2. The limiting reactant is O2. Please review step 3 above for explanation.
3. Determination of the percentage yield of NiO. This is illustrated below:
Actual yield of NiO = 4.86g
Theoretical yield of NiO = 5.09g
Percentage yield =..?
Percentage yield = Actual yield /Theoretical yield x 100
Percentage yield = 4.86/5.09 x 100
Percentage yield of NiO = 95.5%
What forces hold ionic solids together?
O A. lonic bonds
B. Covalent bonds
C. Metallic bonds
D. Hydrogen bonds
SU
Answer:
the bond that hold the ionic solids together is the ionic bond while the force that holds them together is the electrostatic force.
Explanation:
Copper (II) sulfate pentahydrate may be heated to drive off the water of hydration. If 5 g of water are produced, what was the original weight of the copper (II) sulfate pentahydrate (CuSO4 • 5H2O)? CuSO4 • 5H2O → CuSO4 + H2O. The answer given was 13.9g. Can someone explain how this answer is found?
Answer:
13.9g of CuSO4•5H2O
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
CuSO4•5H2O → CuSO4 + 5H2O
Next, we shall determine the mass of CuSO4•5H2O heated and the mass of H2O produced from the balanced equation.
This is illustrated below
Molar mass of CuSO4• 5H2O = 63.5 + 32 + (16x4) + 5(2x1 + 16)
= 63.5 + 32 + 64 + 5(18) = 249.5g/mol
Mass of CuSO4•5H2O from the balanced equation = 1 x 249.5 = 249.5g
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 5 x 18 = 90g
From the balanced equation above,
249.5g of CuSO4•5H2O produced 90g of H2O.
Now, we can determine the mass of CuSO4•5H2O needed to produce 5g of H2O. This can be achieved as shown below:
From the balanced equation above,
249.5g of CuSO4•5H2O produced 90g of H2O.
Therefore, Xg of CuSO4•5H2O will produce 5g of H2O i.e
Xg of CuSO4•5H2O = (249.5 x 5)/90
Xg of CuSO4•5H2O = 13.9g
Therefore, 13.9g of CuSO4•5H2O is needed to produce 5g of H2O.
Tom has 1 cup of a 5% vinegar-water solution, 2 cups of a 10% vinegar-water solution, and 3 cups of a 15% vinegar-water solution. He needs at least 8 cups of a 5% vinegar-water solution for his chemistry project. What is the number of cups of pure water he should add to the total of all his vinegar-water solutions to complete the project?
Answer:
Another eight cups of pure water will be required.
Explanation:
Start by calculating the amount (in cups) of vinegar in these six cups:
One cup of [tex]5\%[/tex] vinegar-water solution would contain [tex]0.05[/tex] cups of vinegar.Two cups of [tex]10\%[/tex] vinegar-water solution would contain [tex]2 \times 0.10 = 0.20[/tex] cups of vinegar.Three cups of [tex]15\%[/tex] vinegar-water solution would contain [tex]3 \times 0.15 = 0.45[/tex] cups of vinegar.Therefore, if these six cups of solutions were mixed, the mixture would contain [tex]0.05 + 0.20 + 0.45 = 0.70[/tex] cups of vinegar. Also, the mixture is supposed to have a volume of six cups. Therefore, the concentration of this six-cup mixture would be:
[tex]\displaystyle \frac{0.70\; \rm cups}{6\; \rm cups} \approx 12\%[/tex].
In other words, if these six cups of vinegar-water solutions are mixed, it would be necessary to dilute (by adding more water) before reaching the concentration of [tex]5\%[/tex].
The goal is to dilute this solution with [tex]0.70[/tex] cups of vinegar to a concentration of [tex]5\%[/tex]. Consider: what would be the volume the solution after dilution?
The volume of a solution can be found from the quantity and concentration of its solute:
Quantity of vinegar in this solution: [tex]0.70[/tex] cups.Concentration of vinegar in this solution: [tex]5\% = 0.05[/tex].After dilution, the volume of this solution would be:
[tex]\displaystyle \frac{0.70\; \rm cups}{0.05} = 14\; \rm cups[/tex].
At this moment, this solution only has a volume of six cups. Therefore, [tex]14 - 6 = 8[/tex] cups of pure water will be required.
which is the smallest number? a. 2.5 b. 2.9 * 10^-3 c. 4.6 * 10^-4 d. 1.4 * 10^-2
Answer:
The answer is option c
4.6 × 10^-4
Hope this helps.
Vincent graduated from college with a degree in horticulture and now owns a local plant nursery. He maintains a blog titled, "How to Live a Happy Life,” and writes that people can lead happier lives by varying the routes they usually take home from work. Which statement best evaluates this claim? This claim is scientific because it is based on Vincent’s personal experience. This claim is scientific because other people have taken his advice and are now happier. This claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology. This claim may not be accurate because most people follow the same route home.
Answer:
this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.
Explanation:
Answer:
this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.
Explanation: give the branliest to the otherperson :)
The electricity that powers your home is generated by a coal-burning power plant, and you drive a gasoline-powered car. You decide to halve your electric bill by turning off all lights and appliances when you do not need to use them. You also decide to walk or ride your bicycle rather than drive to do errands in your neighborhood. Evaluate the effect that these actions might have on two different aspects of the carbon cycle if every person in your neighborhood also performed them.
Answer:
The extent of carbon emission to the atmosphere will reduce thereby decreasing the amount of carbon that is released into the atmosphere in the carbon cycle if we all use bicycles instead of driving around our neighborhood.
If we choose to turn our appliances off, less coal is extracted and burnt to generate energy thereby also reducing the extent of carbon dioxide emission.
Explanation:
The carbon cycle may be defined as all the sequence of processes that involve the interconversion of carbon compounds to various species in nature. It refers to process such as; incorporation of carbon dioxide into living tissue by photosynthesis and ingestion of organic matter by animals, its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
Fossil fuels are generally a very important source of energy. Both gasoline and coal are fossil fuels. The disadvantage of fossil fuels is that the use of fossil fuels increases the concentration of CO2 gas returned to the atmosphere as part of the carbon cycle. This increased CO2 level in the atmosphere leads to greenhouse effect and global warming.
If I and all my neighbors decide to turn off our appliances when they are not in use, less energy is consumed and less coal is burnt for energy thereby reducing the amount of carbon dioxide that is emitted back to the atmosphere in the carbon cycle.
Similarly, if we all ride bicycles while running errands around our neighborhood, less gasoline is burnt as fuel and less carbon dioxide is emitted back into the atmosphere in the carbon cycle.
If less carbon dioxide is emitted into the atmosphere, less carbon dioxide will be available for photosynthetic organisms to take in and this may affect the primary productivity along the food chain. Since plants act as a carbon dioxide sink nature, less carbon dioxide emission will imply less photosynthesis
. ______________ will slow down alcohol absorption. Sleeping well Food in the large intestine Being happy and relaxed Food in the stomach that is high in protein
Answer:
Food in the stomach that is high in protein will dilute absorption of alcohol in your stomach :) therefore always drink with food in your stomach, just drinking alchol without food will have serious consequences on helath.
Explanation:
The elements least likely to form bonds are found in which group?
Answer:
Noble gases are a unique set of elements in the periodic table because they don't naturally bond with other elements.
Explanation:
HAVE A GOOD DAY!
Answer:
The answer is Noble Gases!!
Explanation:
Hope i helped yall! Have a super fantastic day!! Play Among Us! (Of course when your done with school) lol, jk, but u can!! Byes yall!
what mass of methanol is produced when 280.2 g of carbon monoxide reacts with 50.5 g of hydrogen? CO(g)+2H2(g)—> CH3OH(l)
Answer:
320.23g of CH3OH.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
CO(g) + 2H2(g)—> CH3OH(l)
Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:
Molar mass of CO = 12 + 16 = 28g/mol
Mass of CO from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 2 x 2= 4g
Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol
Mass of CH3OH from the balanced equation = 1 x 32 = 32g
From the balanced equation above,
28g of CO reacted with 4g of H2 to produce 32g of CH3OH.
Next, we shall determine the the limiting reactant. This is illustrated below:
From the balanced equation above,
28g of CO reacted with 4g of H2.
280.2g of CO will react with =
(280.2 x 4)/28 = 40.03g of H2.
From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.
Therefore, CO is the limiting reactant and H2 is the excess reactant.
Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.
In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:
From the balanced equation above,
28g of CO reacted to produce 32g of CH3OH.
Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.
Therefore, 320.23g of CH3OH were produced from the reaction.
OK this is a serious question now XD A) NAME ONE WAY THAT ORGANISMS USE CARBON= ? B) NAME THE ONE PROCESS WHICH DECREASES CO2 IN THE ATMOSPHERE= ? C) NAME THE ONE PROCESS WHICH INCREASES CO2 IN THE ATMOSPHERE= ?
Answer:
A) anaerobic respiration
B) photosynthesis
C) breathing
What is the concentration of iodine molecules, I 2 in a solution containing 2.54g of iodine in 250 cm 3 of solution?
Answer:
) Molar concentration =1000*2.54/(127*250) ;since molarity=1000*W/M*V
=0.08 M here W=amount of solute in gm
M= molecular weight of solute
v=volume of solution in ml or cm3
2)% concentration (w/v) =(2.54/250)*100=1.016%
Explanation:
Atomic radii decrease, moving from left to right across a period. As a result, the electrons become closer to the nucleus. What effect does this movement have on the ionization energy (the amount of energy required to remove an electron from an atom)? The ionization energy stays the same. The ionization energy decreases. The ionization energy increases. Electrons have no effect on ionization energy.
Answer:
The ionisation energy increases.
Explanation:
This is because the force of attraction between the electrons and the positive nucleus will increase
The mass number of Fo? is 56. How many neutrons are there in a single Fo? atom?
28
30
56
58
Answer: A. 28
If we aren't talking about an isotope, then the number of neutrons and the number of protons in the nucleus are the same. Each proton weighs one atomic unit, and the same can be said about a neutron as well. So half of the weight is from the protons and half is from the neutrons. The electrons are extremely small relative to the protons that their weight is negligible.
can you help me with this question
Answer:
lithium is the most reactive alkali metal false as the reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal.
covalent bond is formed due to mutual sharing of electrons true
potassium is most reactive matal in activity series of metals false no lithium is more reactive than potassium
the process in which heat is given on surrounding is exothermic reaction not endothermic reaction
alkyl molecule is formed by removal of one hydrogen atom from alkane molecule true
Explanation:
explain the statement "atomic weight or molecular weight is a relative weight"
the relative mass of an atom or molecule is hence considered by considering a mass of a light atom and relating the mass of other atoms or molecules to it
Diphosphorus pentoxide(P2O5) reacts with water to form phosphoric acid, a major industrial acid. In the laboratory, the oxide is used as a drying agent. a.What is the mass of 4.65 x 10 22molecules of phosphorus pentoxide?
Answer: The mass of [tex]4.65\times 10^{22}[/tex] molecules of phosphorus pentoxide is 20.5 g
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {avogadro's number}}=\frac{4.65\times 10^{22}}{6.023\times 10^{23}}=0.0772moles[/tex]
1 mole of [tex]P_2O_5[/tex] weigh = 283.9 g
Thus 0.0772 moles of [tex]P_2O_5[/tex] weigh = [tex]\frac{283.9}{1}\times 0.0722=20.5g[/tex]
Thus the mass of [tex]4.65\times 10^{22}[/tex] molecules of phosphorus pentoxide is 20.5 g
Which is a use for clay?
Answer:
answer is A ceramics
Explanation:
if I am wrong pls correct me :)
A soft drink is sold in a 3.0 L container.
How many milliliters are in the container?
Answer:
3.0×10³ mL
Explanation:
The following data were obtained from the question:
Volume of the container = 3L
We can find the volume in millilitres as follow:
1L = 1000mL
Therefore, 3L = 3 x 1000 = 3000mL
Therefore, there are 3000mL in the container.
To express 3000mL to two significant figure we simply write as follow:
3000mL => 3.0×10³ mL
liquids that do not mix are called
Answer:
Immiscible liquids
Explanation:
Immiscible comes from two words; 'im' indicating a negation or a contradiction; and 'miscere' meaning to mix.
Putting the words together, immiscible means not able to mix.
Which of the following best explains the polarity of water (H2O)?
OA.
Since the oxygen atom has more electrons than the hydrogen atoms, it is negatively charged.
ОВ.
Electrons are more attracted to the oxygen atom, so there is a partial negative charge on the oxygen atom.
OC.
Since there are two positive hydrogen atoms and only one negative oxygen atom, the water molecule is positively
charged
OD
Protons are more attracted to the hydrogen atoms, so the hydrogen atoms become positively charged.
Answer:
B). Electrons are more attracted to the oxygen atom, so there is a partial negative charge on the oxygen atom.
Explanation:
The above statement most aptly describes the polarity or uneven distribution of the density of electrons. In water, two hydrogen atoms and one atom of oxygen leading to the formation of polar covalent bonds. Thus, there is the presence of a partial negative charge close to the oxygen atom and partial positive charge near the hydrogen atom as the former has unshared pair of electrons. This polarity of water allows it to dissolve sugar or other ionic substances in it. Thus, option B is the correct answer.
what name is given ta a metal strip dipped into a solution of salt
Answer:
metal oxide
Explanation:
because anything that reacts with oxygen is oxide
name the food material which is preserved by sun drying
Explanation:
The vegetables like spinach,methi leaves,cauliflower,peas are preserved in our homes by the sun-drying method.
Hope this helps ☺☺
Answer:
Spinach Cauliflower peas fish and grains are preserved by sun drying ☀️☀️How does temperature affect the rate of a reaction?
A. Increasing the temperature decreases the potential energy of the
reactants.
B. Increasing the temperature gives the molecules more kigetic
energy
C. Increasing the tek perature increases the concentration of the
reactants
D. increasing the per perature lowers the activation energy of the
reaction
Complete the passage to Distinguish between mechanical and electromagnetic waves.
Answer:
waves that move through matter only are called mechanical waves.
waves that move through space only are called electromagnetic waves.
Waves that move through matter only are called
(mechanical) waves.
Waves that move through space are called
(electromagnetic) waves.
Could I get a brainliest please?