how many bonds are present in NCl3

Answer:

atoms are bonded with a single bond one double bond

The answer is

O ionic

Answer: Polar covalent

Explanation: Gradpoint

Answer:

Polar Zones - Coldest Temperature

Temperate Zones - Moderate Temperature

Tropical Zones - Hottest Temperature

Explanation:

The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.

*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.

Answer:

I answered the question on edmentum and that person was correct.

Explanation:

The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.

The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.

The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.

Answer: B: Earths tilt

Explanation:

Seasonal variation occurs because the Earth is tilted on its axis by 23.5˚. As Earth orbits the sun, its orientation to the sun changes.

Answer:

Jeweler B = more accurate

Jeweler A = more precise

Error:

0.008, 0

% error :

0.934% ; 0

Explanation:

Given that:

True mass of nugget = 0.856

Jeweler A: 0.863 g, 0.869 g, 0.859 g

Jeweler B: 0.875 g, 0.834 g, 0.858 g

Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864

Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556

Accuracy = closeness of a measurement to the true value

Accuracy = true value - official measurement

Jeweler A's accuracy :

0.856 - 0.864 = - 0.008

Jeweler B's accuracy :

0.856 - 0.856 = 0.00

Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.

However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.

Error:

Jeweler A's error :

0.864 - 0.856 = 0.008

% error =( error / true value) × 100

% error = (0.008/0.856) × 100% = 0.934%

Jeweler B's error :

0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)

% error = 0%

Answer:

8

Explanation:

Since Xe (xenon) is a noble gas, it has 8 valence electrons. It's outer shell is full and it is a stable element and doesn't like to react. Therefore, since the electron dot diagram is about valence electrons, 8 would be your answer.

Answer:

C. They have the same number of protons.

Explanation:

Even though in isotopes, there's uneven number of neutrons, there's always same number of protons.

Hope it helps.

Answer:

answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain

Explanation:

edge in 2020 :)

The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.

Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.

Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.

Hence it is a saturated hydrocarbon that has more than 35 carbons.

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Answer:

Expanding earth and contracting earth

Explanation:

Answer:

A and C

Explanation:

Answer:

i got ddoxed by skai jackson

Explanation:

it sucked

Answer:

The answer is explained below

Explanation:

The question is not complete.

The correct question should be like:

Which of the measurement contain three significant figure?

500

395

0.001

0.00100

1 × 10⁻³

5 × 10²

Answer:

The following are rules applied when considering significant figures:

i) All digits are significant excluding zero. E.g of significant digits are 1,2,3,4,5,6,7,8,9

ii) Any zero that appear within or after non zero digits are significant e.g. 200, 1004, 500009

iii) Zeros before non zero digits are not significant. An example shows significant digits bolded 001,  0.0012, 001.56

iv) Zeros that come after non zero digits are significant even if the number is in decimal form. An example shows significant digits bolded 1000,  0.001200, 001.5600

Therefore:

500: It contains three significant digits

395: It contains three significant digits

0.001:  It contains only one significant digits

0.00100: It contains three significant digits

1 × 10⁻³: 1 × 10⁻³ = 0.001.  It contains only one significant digits

5 × 10²: 5 × 10² = 500. It contains three significant digits

The measurements that contain three significant figure are 500, 395, 0.00100 and 5 × 10²

Answer:

N for chlorate ion is one

Explanation:

Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons

Answer: 26

Correct Answer

Answer:

6.3 atm.

Explanation:

Data obtained from the question include:

Initial pressure (P1) = 6 atm

Initial temperature (T1) = 15°C = 15°C + 273 = 288K

Final temperature (T2) = 30°C = 30°C + 273 = 303K

Final pressure (P2) =..?

Since the volume and number of mole of the hydrogen gas sample is constant, the following equation will used to obtain the new pressure:

P1/T1 = P2/T2

6/288 = P2 /303

Cross multiply

288 x P2 = 6 x 303

Divide both side by 288

P2 = (6 x 303) /288

P2 = 6.3 atm

Therefore, the new pressure of the hydrogen gas sample is 6.3 atm.

Answer:

They could cause an organism and population and species to die.

Explanation:

If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides

Answer:

14.40g of H2

Explanation:

The balanced equation for the reaction is given below:

B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)

Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:

Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol

Mass of B2H6 from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 6 x 2 = 12g

From the balanced equation above,

28g of B2H6 reacted to produce 12g of H2.

Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:

From the balanced equation above,

28g of B2H6 reacted to produce 12g of H2.

Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.

Therefore, 14.40g of H2 were produced from the reaction.

Answer:

O chemical change  because a temperature change was observed, which indicated that the water

Explanation:

I have taken this class

Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.

So A

Explanation:

This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.

Answer:

3.5 g CO2

Explanation:

A hummingbird emits up to 3.5 grams of CO2 a day.

Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)

=3.5 grams

Hope this helps!

Answer:

Yes

Explanation:

What's the question?

Answer:

yes, they both use it to fllight.

Explanation:

As they are adapted to flight to various places to catch their prey and be safe from various type of harms.

hope it helps..

Answer:

FROM the magnetic point of view, phosphorus is an extremely interesting

substance because of its allotropic modifications. The ordinary forms are

the yellow (or white) and the red varieties. X-ray investigations indicate

that probably yellow phosphorus is analogous with the cubic forms of antimony and arsenic; and red phosphorus with monoclinic antimony and

arsenic (Mellor, 1928). The conclusions of different workers on the structure of red phosphorus are not in agreement. There is also Bridgman's black

phosphorus which is probably hexagonal (Linck and lung, 1925). Natta

and Passerini (1930) have studied the crystal structure of white phosphorus.

This substance when condensed at the temperature of liquid ammonia is

cubic. Atomic positions however are yet undetermined. Another and noncubic form is obtained by condensation at liquid-air temperatures. It is

thus clear that most likely white phosphorus is cubic in structure with a

probable superposition of another lattice.

The evidence from Raman effect also points to the same conclusion.

Bhagavantam (1930) investigated the Raman effect of white phosphorus in

the solid state. The characteristic frequencies obtained by him are 607, 468

and 374. Since the phosphorus molecule is known to contain 4 atoms,

Bhagavantam (1930) has shown that the tetrahedral structure fits the results

satisfactorily since such a structure would give only three frequencies. But

for the particular law of forces adopted, the frequencies should have the

ratio 2: 2: 1 but the observed frequencies deviate considerably.

Phosphorus is a really intriguing element. because of the allotropic changes to the material.

Red phosphorus is likely akin to monoclinic antimony, while yellow phosphorus is probably similar to the cubic forms of antimony and arsenic.

There is disagreement among the findings of many researchers regarding the structure of red phosphorus. Additionally, Bridgman's black It is presumably hexagonal, phosphorous (Linck and lung, 1925). Natta and Passerini (1930) have investigated the white phosphorus crystal structure.

Condensed from this material at liquid ammonia temperature is cubic. However, the locations of the atoms are still unknown. Condensation at liquid air temperatures yields a different, noncubic shape.

Therefore, Phosphorus is a really intriguing element. because of the allotropic changes to the material.

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Answer:

B. Alpha

Explanation:

Alpha decays always split into an element and He.

Beta decays always split into an element and e- (eletrons).

Gamma decays always split into an element and radiation.

Answer:B

Explanation:

TOOK DA TEST

As the firework releases heat, it is considered as exothermic reaction. The correct option is B.

An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.

Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.

Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.

Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.

Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.

As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.

Thus, the correct option is B.

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Answer:

D. all of the above.

Explanation:

The kinetic-molecular theory of gases suggests that; the particles of a gas move independently of each other, the particles in a gas move rapidly, the particles in a gas are far apart.

Hope it helps.

Answer:

E. Mass number

H. Ion

F. Isotopes

I hope you have a great day. I'm sorry that I didn't know C or I.

Answer:

5

Explanation:

Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5

Answer:

A) 5

Explanation:

5

The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5

Answer:

The correct answer is C. Plz mark brainiest

Explanation:

Answer:

1) The full electron configuration for phosphorus is 1s²2s²2p⁶3s²3p

2) Phosphorus is paramagnetic

Explanation:

1) To write the electron configuration, we follow the electron filling order, that is starting from 1s, to 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4f, 5s, 5p, 5d, 6s till the electrons are all accounted for (up to 58)

We note that the s orbitals can each take two electrons while the p orbital can take 6 electrons and the d orbital can take 10 electrons

The electron configuration chart for phosphorus, P, is given as follows;

1s²2s²2p⁶3s²3p.

2) Diamagnetism is the temporary magnetism is the magnetism of a material that exists in the presence of a magnetic field due to a a change in the atomic electron orbital motion

Paramagnetism is a magnetism in which a material is weakly attracted by an applied external magnetic field such that there is induced magnetism in the applied magnetic field direction

Paramagnetic materials have have unpaired electrons that give them permanent magnetic moments in the absence of an applied magnetic field as such unpaired electrons are termed paramagnetic electrons and atoms that have one or more unpaired electrons are paramagnetic

Phosphorus, with the 3 partially filled p orbitals have 3 unpaired electrons in their outermost shell giving them the overall properties of a paramagnetic materials.

Answer:

c) They have different charges but the same mass.

Explanation:

The atoms have a different charge from each other because one atom has one more electron than the other. They have the same mass because the number of protons and neutrons are the same in both atoms.

The given atoms have different charges and masses. So the correct option is D.

The amount of matter that makes up an element's atom, or atomic mass. It is stated as a multiple of 1.992646547 × 10⁻²³ grams, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. One atomic mass unit (amu), on this scale, is equal to 1.660539040 × 10⁻²⁴ grams. The dalton (Da) is another name for the atomic mass unit that honors the English chemist John Dalton.

The total mass of the protons, neutrons, and electrons that make up an atom is a little bit less than the observable atomic mass. According to an equation, the energy produced during the combination of these particles is converted into binding energy, which equals the product of the mass (m) spent and the square of the velocity of light in vacuum (c), or E = mc². This discrepancy is known as the mass defect.

Therefore the correct option is D.

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Answer: Non Metal

Explanation: Boron. Boron is a non metallic element and the only non-metal of the group 13 of the periodic table the elements

Answer:

D

Explanation:

total mass should be equal on both sides

it's a double do displacement reaction

HCl + NaOH --> NaCl + H2O