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:

15.5 grams

Explanation:

molar mass of NO3=62g/moles

number of moles=0.25mol

mass in gram= ?

as we know that

number of moles=[tex]\frac{mass in gram}{molar mass}[/tex]

number of moles×molar mass=mass in grams

mass in grams=62g/moles×0.25moles

mass in grams=15.5grams

Answer:

7. Mg

8. Atom

9. -ide

10. is made up of only one kind of atom

Answer:

7) Mg

8) Poorly worded question, but pretty sure it's an atom

9) It depends on the elements reacted, but it should be -ide

10) Is made up of only one kind of atom

Answer:

Due to the difference in the relative atomic masses and therefore, the molecular masses of Zn and Pb, one mole of Zn is about 3.2 times lighter than one mole of Pb

Explanation:

From the periodic table, we have;

The atomic number of zinc, Zn = 30

The atomic mass of zinc, Zn = 65.38 amu

The molar mass of zinc, Zn = 65.38 g/mol

The atomic number of lead, Pb = 82

The atomic mass of lead, Pb = 207.2 amu

The molar mass of lead, Pb = 207.2 g/mol

Therefore, whereby equal number of moles of Zn is lost and Pb is gained, we have;

Mass of 1 mole of Zn = 65.38 grams

Therefore, 1 gram of Zn = 1/65.38 moles = 0.0153 moles

0.12 grams of Zn = 0.12×0.0153 = 0.00184 moles of Zn

Given that equal number of moles of Zn and Pb are involved in the reaction, the number of moles of Pb gained = 0.00184 moles

The mass of Pb gained = Number of moles of Pb gained × Molar mass of Pb

The mass of Pb gained = 0.00184 × 207.2 = 0.38 g ≈ 0.4 g.

Amount of Pb gained = 0.43 g ≈ 0.4 g

Answer:

The formula for molality is m = moles of solute / kilograms of solvent. In problem solving involving molality, we sometimes need to use additional formulas to get to the final answer. One formula we need to be aware of is the formula for density, which is d = m / v, where d is density, m is mass and v is volume

Explanation:

it is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.

Answer:

Ozone

Explanation:

The ozone layer protects the UV rays and also theres a hole in it near antarica which is causing global warming!

Off topic sorry lol:P

I hope this helps i got the answer correct

Remember to mark brainliest

Answer:

See explanation

Explanation:

Answer : The original volume of gas is [tex]365cm^3[/tex]

Explanation :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 800 torr

[tex]P_2[/tex] = final pressure of gas at STP = 760 torr

[tex]V_1[/tex] = initial volume of gas = ?

[tex]V_2[/tex] = final volume of gas at STP = [tex]450.0cm^3[/tex]

[tex]T_1[/tex] = initial temperature of gas = [tex]-40^oC=273+(-40) =233K[/tex]

[tex]T_2[/tex] = final temperature of gas at STP = [tex]0^oC=273+0=273K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{800torr\times V_1}{233K}=\frac{760torr\times 450.0cm^3}{273K}[/tex]

[tex]V_1= 364.8cm^3\approx 365cm^3[/tex]

Therefore, the original volume of gas is [tex]365cm^3[/tex]

Answer:

increase the amount

Explanation:

jus took the test

The pressure is dependent on the area over which the force is acting, the pressure can be increased or decreased without any change in the force. Here on increasing the pressure, the amount of gas on the solution increases. The correct option is A.

The force which is applied perpendicular to the surface of an object per unit area over which the force is distributed is known as the pressure. In the field of chemistry, the pressure arises due to the movement of molecules and their collision with one another and the walls of the vessel.

All gases exert pressure, it is one of the fundamental measurable quantities of this phase of matter. Even our atmosphere exerts pressure. The pressure of the atmosphere is 101,325 Pa. The SI unit of pressure is Pascal.

Here when Naomi has increased the pressure on a solution of liquid and gas in a closed container, the amount of gas also increases.

Thus the correct option is A.

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Answer:

B - Poor crop production

Explanation:

I just did the quiz on Edge 2021

Answer:

b

Explanation:

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

Answer:

234.9 grams

Explanation:

Hope this helps

Answer:

2.1 L

Explanation:

V2=(V1T2)/T1

Change C to K

Answer:

2.067 litres

Explanation:

the volume of a gas is directly proportional to absolute temperature at constant pressure

v1/t1=v2/t2

2/298=v2/308

v2=616/298=2.0671 litres

Answer:

Electrons are ejected from the surface of the metal.

Explanation:

Answer:

Genetic tagging, or the identification and tracking of individual animals using DNA, is a non-invasive method of conducting research that uses samples from shed hair, feathers, feces, or saliva. ... Genetic tagging approaches are complementary to traditional approaches and add a powerful tool to the ecologists' toolkit."

Explanation:

Answer:

Na3P is Sodium phosphide

Na3PO4 is sodium phosphate

Explanation:

Na3P is a combination of the element sodium

and the element phosphorus.

When writing the chemical formula of compounds , we have to take into consideration the valencies or combining powers of the individual parties, whether single elements or radicals

Under general terms, the valency of sodium is -+1 and its combining form can be written as Na+. While in the case of phosphorus, its own is -3 and its form is P3-.

Now, to write the chemical formula, there has to be an exchange of valencies by the two elements in question. That is why finally, sodium took 3 and phosphorus took 1 and we have Na3P.

Now, for the name phosphide, phosphides are binary compounds that contain phosphorus and a metal . When we talk of binary compounds, we mean compounds that have two elements only. So because sodium is a metal, we have to give the name phosphide to the compound.

Na3PO4

Referencing the explanation made above, but this is a bit different. We have sodium coming in contact with a radical here. The combination it is making here is with the phosphate ion (PO4)3-.

So as usual, there is an exchange of valency and thus sodium takes the 3, while the whole phosphate group take 1. So therefore, the name of the compound is gotten from the combination of the individual parties and it is called sodium phosphate.

Answer:

c

solids do vibrate very minutely\

Explanation:

Monomers and polymers

Most large biological molecules are polymers, long chains made up of repeating molecular subunits, or building blocks, called monomers.

The long chains formed by the process of polymerization are called monomers.

In biological macromolecules, polymerization is the chemical process through which relatively tiny and smaller molecules, known as monomers, unite to form a very big chainlike or network of molecules known as a polymer.  

These monomers undergo reactions with one another to form larger molecules known as polymers. The types of monomers in biological macromolecules include:

Each of these individual monomers is critical to the survival and evolution of life.

Therefore, we can conclude that the long chains formed by the process of polymerization are called monomers.

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Answer:

Explanation:

Carbon

Answer:

Explanation:

Answer:

Explanation:

metal

Answer:

I would say Metal

Explanation:

Technically, all 4 aren't renewable (but sunlight, water, and wind are considered renewable energy sources), but metal is the best choice

Metal ore will run out and cannot be recreated.

Reasons why I think all 4 aren't renewable

Sunlight will die in around 6 billion years

Water will evaporated in 6 billion years when the sun blows (if it even ever survives the global warming we're facing)

Wind will be gone when the earth is swallowed by the sun

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.

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:

Answer:

The independent variable, the one that is intentionally manipulated, is ✔ the physical properties.

The dependent variable, the one that you measure the response in, is ✔ the pH of the solution.

Explanation:

In an experiment, the independent variable the one that is intentionally manipulated is physical property and  dependent variables is the pH of the solutions as it is dependent on physical property.

Variables are defined as any characteristics, number or quantity which can be measured . It can also be called as a data item . It is called as variable because they can vary and can have variety of values.

There are three types of variables 1) manipulated variable where in a condition is specified, 2) responding variable which is dependent on manipulated variable 3)controlled variable which do not change

Example of manipulated variables are number of hours spent by a student studying , that of responding variable is result of a student and temperature is an example of controlled variable.

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Answer:

Distilation because they have different boiling points

The 3 isomers of pentane and their normal boiling points are:-

pentane, b.p approx. 36.C

iso pentane, b.p approx. 28.C

neo pentane, b.p approx. 10.C

Those differences in their boiling points make possible them to separate by Distilation.

Hope this will help....

Answer:

chemcial energy :)

Explanation:

Answer:

at the light = radiant energy

at the line = electical energy

at the battery = chemical energy

Answer:

Iron is oxidized to form rust.

Explanation:

Consider the reaction; 4Fe + 302------>2Fe2O3, we can see that iron is being oxidized to iron III oxide. Rust is the common name of iron III oxide.

Rusting is an electrochemical process, iron rusts when it comes into contact with air and water because electrochemical cells are set up at the surface of contact.

Iron usually functions as the anode in the electrochemical process. This process leads to the formation of iron III oxide. Rust is soft and breaks off easily thereby exposing the metal below the surface to further rusting.

Answer:

Iron is oxidized to form rust.

Explanation:

edge

Answer:

The different objects that make up a circuit are called components. A circuit must have a power source, such as a battery, and the current flows through a conductor, such as a wire.

Explanation:

I hope that was useful.

The issue government must consider before passing conservation policies is : ( B )  cost to implement conservation policies

The cost benefit of the passing and implementation of any government policy plays a very vital role in determining, how and when the government will pass the policy.

The conservation policies help to conserve our environment and retain natural habitats of organisms. therefore the cost effect of implementing the policies is a very important factor that must be considered by the government

Hence we can conclude that The issue government must consider before passing conservation policies is cost to implement conservation policies

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Answer:

Perigee

Explanation:

In Perigee, The moon appears closer.