Need help with my work chemistry assignment grade 12 college work please

Answer:

Random

Explanation:

Materials have numerous domains. Domains have a north and south side. In magnetic metals, all of the domains are pointed in the same direction. This creates an overall magnetic field that gives the material its magnetic property.

On the other hand, non-magnetic materials still have domains but they don't face the same direction. Instead, they are randomly directed. This means that the material cannot have the same magnetic properties that ferromagnetic materials have.

Answer:

2 i think if not than its 4

Explanation:

Answer:

3 if its not than 4

Explanation:

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]KE = \frac{1}{2} m {v}^{2} \\ [/tex]

where

m is the mass

v is the velocity

From the question we have

[tex]KE = \frac{1}{2} \times 700 \times {20}^{2} \\ = 350 \times 400[/tex]

We have the final answer as

Hope this helps you

Answer:

no (units don't cancel each other out)

yes (convert both to same unit and multiply)

yes (multiply)

Explanation:

Answer:

Oxidation is the loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule. Reduction is the gain of electrons or a decrease in the oxidation state of an atom, an ion, or of certain atoms in a molecule.

Explanation:

To solve such this we must know the concept of redox reaction. Therefore, The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Oxidation and reduction reaction involves gain of electron and loss of electron simultaneously. This type of reaction is called redox reaction. The cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.

Therefore, the cause of rejection of classical concept of oxidation and reduction reaction is in any process, oxidation can occur only if reduction is also taking place side by side and vice versa.

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Answer:

lithium fluoride => LiF

lithium chloride =>LiCl

lithium bromide => LiBr

lithium iodide => Lil

lithium oxide =>Li₂O

lithium sulfide => Li₂

sodium fluoride => NaF

sodium chloride => NaCl

sodium bromide => NaBr

sodium iodide => Nal

sodium oxide => Na₂O

sodium sulfide => Na₂S

potassium fluoride => KF

potassium chloride => KCl

potassium bromide => KBr

potassium iodide => KI

potassium oxide => K₂O

potassium sulfide => K₂S

ammonium fluoride =>NH₄F

ammonium chloride => NH₄Cl

ammonium bromide => NH₄Br

ammonium iodide => NH₄I

ammonium sulfide => (NH₄)₂S

[tex]density = \frac{mass}{volume} [/tex]

1. density = 57/300

= 0.19 g/ml

2. density = 57/12

= 4.75 g/ml

3. density = 15/3

= 5.0 g/ml

Considering the definition of STP conditions and reaction stoichiometry, the volume of excess reactant that remains after the reaction is complete is 4.928 L.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

In first place, the balanced reaction is:

CH₄ + 2 O₂  → CO₂ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

You know that in a certain reaction at STP, 29.2 L of methane CH₄ is combusted with 63.3 L of oxygen O₂.

Considering the definition of STP, you can apply the following rules of three:

[tex]amount of moles of methane=\frac{29.2 Lx1 mole}{22.4 L}[/tex]

amount of moles of methane= 1.30 moles

[tex]amount of moles of oxygen=\frac{63.3 Lx1 mole}{22.4 L}[/tex]

amount of moles of oxygen= 2.82 moles

Now you can apply the following rule of three to determine the excess reagent: if by stoichiometry 2 moles of O₂ reacts with 1 mole of CH₄, if 2.82 moles of O₂ react, how much moles of CH₄ will be needed?

[tex]moles of CH_{4} =\frac{2.82 moles of O_{2}x 1 moles of CH_{4}}{2 moles of O_{2}}[/tex]

moles of CH₄= 1.41 moles

But 1.41 moles of CH₄ are not available, 1.30 moles are available. Since you have less moles than you need to react with 2.82 moles of O₂, methane CH₄ will be the limiting reagent. And oxygen O₂ is excess reagent.

Now you can apply the following rule of three to the amount of O₂ that reacts when the limiting reactant reacts completely: if by stoichiometry 1 mole of CH₄ reacts with 2 moles of O₂, if 1.30 mole of CH₄ react, how much moles of O₂ will be needed?

[tex]moles of O_{2} =\frac{2 moles of O_{2}x 1.30 moles of CH_{4}}{1 moles of CH_{4}}[/tex]

moles of CH₄= 2.60 moles

So, after the reaction is complete, the moles of excess reactant that remains are calculated as:

2.82 moles - 2.60 moles= 0.22 moles

Finally, considering the definition of STP, you can apply the following rule of three: if by definition of STP conditions 1 mole of O₂ occupies a volume of 22.4 liters, 0.22 moles occupies how much volume?

[tex]volume=\frac{0.22 molesx22.4 L}{1 mole}[/tex]

volume= 4.928 L

In summary, the volume of excess reactant that remains after the reaction is complete is 4.928 L.

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STP conditions:

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Answer:

the problem is that Gary is not the smartest snail.the hypothesis is that he thinks he can get smarter by eating super snail food everyday.

hope this helps

A decomposition reaction occurs when one reactant breaks down into two or more products. It can be represented by the general equation: AB → A + B. In this equation, AB represents the reactant that begins the reaction, and A and B represent the products of the reaction.

RbCI = rubidium chloride

Answer:

Carbon

Explanation:

Steel is an alloy of iron and carbon. Stainless steels are steels containing at least 10.5% chromium, less than 1.2% carbon and other alloying elements

Answer: B

Explanation:Steel is an alloy of iron and carbon.

Answer:

buffer

Explanation:

Answer:

Metal ions are fundamental elements for the maintenance of the lifespan of plants, animals and humans. Their substantial role in biological systems was recognized a long time ago. They are essential for the maintenance of life and their absence can cause growth disorders, severe malfunction, carcinogenesis or death

Explanation:

:)

The final temperature of the bomb calorimeter is 30.9°C.

Combustion reactions are those reactions in which a compound completly decompose in to carbon dioxide and water molecule.

The final temperature will be calculated by using the equation:

Q = mc(T₂ – T₁), where

Q = relesed heat from calorimeter = 24kJ = 24000J

m = mass of calorimeter = 1.30kg = 1300g

c = specific heat of calorimeter = 3.41 J/(g°C)

T₁ = initial temperature of calorimeter = 25.5°C

T₂ = final temperature of calorimeter = to find?

On putting all these values on the above equation and calculate for T₂, we get

T₂ = 24000/(1300)(3.41) + 25.5

T₂ = 30.9°C

Hence, correct option is (1) i.e. 30.9°C.

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Answer:

30.9

Explanation:

right on edge 2022

Answer:

Amplitude is measured from the center line to the highest point in the waves.

Wavelength is the distance between one wave to the other from the highest point.

Frequency is the rate of the waves.

Answer:

Potential energy is the energy possessed by an object because of its position with respect to a reference.

Explanation:

The energy obtained because of its location or position is called potential energy.

》Example:

Water in a dam stores potential energy because of its height.

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Answer:

A standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

All the data is given in the question and these are as follows:-

Moles - 0.75

Na - 6.022*10^{23

The formula we are using to find the molecules is as follows:-

n = \frac{molecule}{Na}n=

Na

molecule

After, putting the value and solving it. we will get

0.75 * 6.022*10^2^3 = 4.5165*10^{23

Answer:

Is there any options?

Explanation:

Your Q is not visible .Plz provide it

2. D, because transition metals have a high density.

3. B, because the properties of elements depend on the valence electrons.

4. C, because the atom emits a negatively charged electron, the atom becomes positively charged.

5. D, because hydrogen and helium are both lighter than air, but hydrogen is very reactive, that's why helium is used.

6. A, because it creates caustic soda.

7. C, because only fluorine and argon are gases, but argon is not two-molecular.

8. C, because iodine is either solid or gaseous. Solid iodine is gray and gaseous iodine is purple.

9. C, because all elements of the first main group have an odd number of protons and react violently with water.

10. D, because oxygen is air. Nitrogen is very reactive and helium is lighter than air.

11. A, because carbon has atomic number 6 and magnesium has atomic number 12.

12. B, because table salt is sodium chloride.

13. B, because sodium ions and neon have the same electron configuration.

14. C, because chloride ions and argon have the same electron configuration.

15. C, because calcium ions and argon have the same electron configuration.

16. D

17. C, because silicon has 4 valence electrons and a total of 14 electrons.

18. A

19. B, because it's sodium.

20. Number of protons and electron shells

21. first main group

22. seventh main group

23. cesium

24. fluorine

25. alkali metals

26. alkaline earth metals

27. halogens

28. from metal to nonmetal

29. valence electrons

30. electron shells

31. main group and subgroup

32. semi-metal

33. 18 groups and 7 periods

34. groups

35. periods

Answer:

True

Explanation:

A hand weavers would take much more time in their craft than large factories did, their industry began to decline and be replaced by industrial machines.

The equilibrium constant for the given reaction is 0.0421.

Equilibrium constant of any reaction is define as the ration of the product of concentration of products to the product of the concentration of reactants, with raise to the respective coefficients.

Given chemical reaction is:
PCl₅ → PCl₃ + Cl₂

The equilibrium constant's for this reaction is:

Kc = [PCl₃] [Cl₂] / [PCl₅], where

Concentration of [PCl₃] = 0.020M

Concentration of [Cl₂] = 0.020M

Concentration of [PCl₅] = 0.0095M

Putting all these values in the above equation we get,

Kc = (0.02 x 0.02) / 0.0095 = 0.0421

Hence, 0.0421 is the equilibrium constant.

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Answer:

A on edg

Explanation:

im doin it rn

Answer:

temperatures within the outer core range from 7,200 to 9,000 F. Pressure also increases in the outer core due in part to the weight of the crust and mantle above.The Earth's magnetic field is generated by the outer core.

Explanation:

Answer:

1. whales  are mammals and fish are not

2. Fish have gills which extract oxygen from the water and thus allow it to live underwater its entire life. Whales on the other hand do not have gills but instead have one or two blowholes

3. whales provide milk to their young and fish do not!

Explanation:

Answer:

yes it is branch science make physics and biology in physics make therom and biology make defination

Answer:

D) Ba < Pb < P

Explanation:

Barium (Ba): 5,2117

Lead (Pb): 7,4167

Phosphorus (P): 10,4867

Answer:

The function of the cathode ray tube is to convert an electrical signal into a visual display. Cathode rays or streams of electron particles are quite easy to produce, electrons orbit every atom and move from atom to atom as an electric current.

Explanation:

A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a tree, or a sign - make good reference points.

Answer:

thats alot and makes no since