What are magnetic field lines and what do they do? Explain likes and opposites in this

Answer:

Explanation:

Ionic bonds result from transfer of electrons, whereas covalent bonds are formed by sharing. 2. Ionic bonds are electrostatic in nature, resulting from that attraction of positive and negative ions that result from the electron transfer process; charge separation between covalently bonded atoms is less extreme.

Formation reaction is the formation of 1 mole of product from the constituents of the reactant molecules. The mass of oxygen that must react is 182 gm.

Mass of the substance is the weight while the molar mass of the substance is the addition of the atomic mass of the individual mass of the constituent atoms of the compound or the molecule.

The chemical reaction can be shown as:

[tex]\rm 4 Al + 3 O_{2} \rightarrow 2 Al_{2}O_{3}[/tex]

From the reaction, it can be said that 3 moles of oxygen are required to produce 2 moles of aluminium oxide, so x moles of oxygen will be required to produce 3.80 moles of aluminium oxide.

Solving for x:

[tex]\begin{aligned}\rm 2x &= 3.80\times 3\\\\\rm x &= \dfrac{11.4}{2}\\\\&= 5.7\;\rm mol\end{aligned}[/tex]

If 1 mol of oxygen is 32 gm then 5.7 moles of oxygen will be 182.4 gm.

Therefore, option D. 182 gm is the mass of oxygen required.

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Answer:

[Ar] 4s²

Explanation:

Answer:

B

Explanation:

Tanya should slowly spin the tennis ball five times around an imaginary axis.

The earth revolves around the sun 1 time per year.

BUT

the earth rotates on its' axis, causing seasons, Summer, winter, autumn, spring

Answer:

In one year Earth makes one revolution around the Sun.

Explanation:

In one day Earth makes one rotation on its axis. Earth also travels on an elliptical orbit around the Sun. And it takes one year to make a complete trip.

Answer:

[tex]V=3850.1769\;L[/tex]

Explanation:

Gas law is the mathematical relationship among pressure,volume, temperature, and the number of moles of a gas. It is the equation of state for an ideal gas. Which is because the state of a gas can be known by it pressure, volume, temperature, and number of moles.
Look below which "R" is a constant

[tex]PV=nRT[/tex]

[tex]n=8.47kg\times(\frac{1000g}{1kg})\times(\frac{1mol}{64.066g})[/tex]

[tex]n=132.2074\;mol[/tex]

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{(132.2074\\;mol\times(8.314\frac{L\cdotkPa}{mol\cdotk)}\times(40+273.15)k}{89.4\;kPa}[/tex]

or (3.85 x 10^3 L)

[tex]V=3850.1769\;L[/tex]

~Lenvy~

Answer:

0.28 moles

Explanation:

molar mass of silver= 107.86

[tex]30.5 g Ag*\frac{1 mole Ag}{107.86 g Ag} =0.28 moles[/tex]

Answer:

ch and aporda e too

Explanation:

hope its help

According to this question, a substance with a high volatility readily evaporates.

Volatility is the characteristics of a material which describes how readily the material undergo vaporization.

Volatile substances readily change phase from solid or liquid to gases via the process of vaporization.

Therefore, according to this question, a substance with a high volatility readily evaporates.

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Answer:

3 CaCl2 + 2 Na3Po4 yields Ca3(Po4)2 + 6 NaCl

Explanation:

Answer:

Explanation:

Na3(Po4)+CaCl2→Ca3(Po4)2+NaCl

Start on the left side with the reactants.

There are 3 Na in Na3(Po4) so there must be 3 Na on the right in products.

That means 3 NaCl which has 3 Cl.

But there are only 2 Cl in CaCl2 on the left.

6 is a common multiplier of 2 and 3 so multiply CaCl2 by 3 and Na3(Po4) by 2 to get the balanced equation:

2 Na3(Po4) + 3 CaCl2 → Ca3(Po4)2 + 6 NaCl

Answer:

22 626 000 J. = 22 626 kJ. 4. If 9000 J of heat are absorbed by 800 g of water at 5.0 o. C, what maximum temperature will the water attain? Q = mc ∆T.

Explanation:

The final temperature can be calculated using the calorimetric equation. Here, the final temperature of water is 27.71 °C.

The calorimetric equation connecting the heat energy absorbed or released q by a system with the mass m, temperature difference ΔT and the specific heat capacity c as follows:

q = m c ΔT

The specific heat capacity of water = 4.15 J/ °C g.

given that heat energy absorbed q = 9000 J

mass = 800 g

initial temperature = 25 °C.

Then,

9000 J = 4.15 J/ °C g. × 800 g (25 °C + T)

then T = [ 9000 J/  4.15 J/ °C g. × 800 g ] + 25 °C = 27.71  °C.

Therefore, the final temperature of water is 27.71  °C.

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Answer:

The lack of heat

Explanation:

when vapor gets cold enough, it reverts back to a liquid, when liquid gets cold enough, it freezes into a solid.

Answer:

13.1548172

Explanation:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CH4, or 16.04246 gram

so 0.82 × 16.04246

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Answer:

C

Explanation:

Cuz trust me it’s c

Answer:

cetacean i think thats the answer

Answer:

Trigonal pyramid

Explanation:

Coconut is the type of food in which the layers of the Earth is compared with.

This is referred as the third planet from the Sun and is irregularly shaped ellipsoid and has the most life forms present.

The ellipsoid shape of the Earth is the same as that of a Coconut which was why option B was chosen as the most appropriate choice.

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Answer:

B.) Chemical changes produce new substances, while physical changes do

not.

This is a chemical change as the products have very different property as compared to reactant not only physically but also chemically. Therefore, the correct option is option B.

Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same

One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.  

Cooking is a chemical change not a physical change. During cooking the reaction that is associated is combustion reaction as the by product is carbon dioxide and water. Chemical changes produce new substances, while physical changes do not.

Therefore, the correct option is option B.

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Answer:

The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth's polar regions. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer.

Answer:

Explanation:

The density of a substance can be found by using the formula

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

From the question

mass = 411 g

volume = 384 cm³

We have

[tex]density = \frac{411}{384} \\ = 1.0703125[/tex]

We have the final answer as

Hope this helps you

Answer:

13350 Joules

Explanation:

[tex]q=m*c*(Change in T)[/tex]

m=mass in grams = 3000

c=specific heat capacity = 0.89 J/(g*C)

Change in T= 23-18 = 5 C

Answer:

I think the answer is 13,455 J

C- main sequnce

Regulus A is a binary star consisting of a blue-white main sequence star of spectral type B7V, which is orbited by a star of at least 0.3 solar masses, which is probably a white dwarf. The two stars take approximately 40 days to complete an orbit around their common centre of mass.

Answer:

D. As pure elements because most elements are unreactive.

Explanation:

This is because, like the answer says. Grass isnt really a toxic chemical that can explode and turn into iron or something when it touches water. And most natural elements are pure.

Answer:

Frequency= [tex]\frac{speed of wave}{wavelength} =\frac{340}{2.5} =136Hz[/tex]

Explanation:

Hope this helps.

Answer:

The correct answer is:  sustainability over time with varying conditions.

Explanation:

A habitat can be defined as the physical and geographical conditions that will positively influence the development of life, in any form.

Therefore, it is correct to say that sustainability over time with favorable conditions will favor the greatness of the habitat.

Sustainability is the ability to preserve a system for the maintenance of future life, so it is ideal for there to be sustainable development across society, so that natural resources are preserved so that biodiversity continues to exist.

Answer:

Evaporation and condensation are two processes through which matter changes from one state to another.

Explanation:

Change of state is a factor in the processes of condensation and evaporation. Evaporation refers to the transition of a substance from a liquid to a gas. Condensation describes the transition from a gas to a liquid form. They occur when molecules receive or lose energy. Heat is a form of this energy.

Answer:

The laboratory equipment is called beaker

The wavelength : 1.31 m

Waves are vibrations that travel  

There are several parts of the wave namely:  

frequency, period, wavelength and wave velocity  

Frequency (f): the number of waves that occur in one second  

Period (T): The time required to travel one wave  

Wavelength (λ): the distance from one crest to another, or from one trough to another (on transverse waves) and the distance between two consecutive compressions or between two consecutive rarefactions (on longitudinal waves)  

Fast wave propagation (v): the distance traveled by waves per unit of time  

The formula:

 [tex]\tt v=\lambda\times f[/tex]

The speed of a sound wave 345 m, and the frequency = 264 Hz , so

v = 345 m

f = 264 Hz,  

then the wavelength :

[tex]\tt \lambda=\dfrac{v}{f}=\dfrac{345}{264}=\boxed{\bold{1.31~m}}[/tex]

Answer:   5.1 x 10^-3 < 0.0057 < 4.9 x 10^-2 < 0.0072 x 10^2 < 5.3 x 10^4 < 57 x 10^3

Because:- 5.3 x 10^4 = 53000

                 57 x 10^3 = 57000

                  4.9 x 10^-2 = 0.049

                 0.0057 = 0.0057

                 5.1 x 10^-3 = 0.0051

                 0.0072 x 10^2 = 0.72

___________________________

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