Which of the following best describes a chain reaction? Select one: a. Neutrons from splitting atoms continue to split other atoms, releasing more neutrons. b. Chemicals released from splitting atoms cause other atoms to split. c. Splitting atoms bump into neighboring atoms, causing them to split. d. A splitting atom causes the atom directly beside it to also split.

A compound is a substance formed when two or more different elements bond together chemically. In the options provided, 'a substance made of two oxygen atoms for each carbon atom' describes a compound, specifically carbon dioxide (CO2).

In chemistry, a compound is a substance formed when two or more different elements are bonded together. For the options provided in your question, the choice 'a substance made of two oxygen atoms for each carbon atom' most accurately describes a compound. This describes the compound carbon dioxide (CO2), where each molecule includes one carbon atom bonded to two oxygen atoms. Remember, a substance that consists of two or more elements that are chemically combined is regarded as a compound.

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Answer:

Diffraction

Explanation:

When light enters water at an angle, it is bent downward by diffraction. However, our brain sees the underwater image as if it were on a straight line.

Thus, the bottom of the pool appears to be shallower than it actually is.

A is wrong. If all the light were reflected from the surface, we wouldn't be able to see the person's feet.

B is wrong. if all the light rays interfered with each other, we wouldn't be able to see anything.

D is wrong. Refraction is the bending of light as it passes the edge of an object.

Answer:

refraction

Explanation:

Answer:

The correct answer is "They can be separated by physical processes"

Explanation:

The definition of Mixtures is the blending of two or more dissimilar substances.

Mixtures can be divided into those that are homogeneous or heterogeneous meaning that they can be distributed evenly or can't be distributed evenly.

Answer:

Your answer is A. far less mass than either a proton or a neutron

I am 10000% sure  this is correct

hope this helps ya

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Answer:

the answer is a

Answer:

d) when it meets the test of repeated expected experimentation.  

Explanation:

A hypothesis is a guess based on observation in the the behavior of nature. This guess is used to formulate the relevant experiments and when the experimental results consistently meet the expected outcomes then the hypothesis graduates into a theory. Theories form the basis of many fields in science as they try to explain the behavior of nature.  

Answer:

d) when it meets the test of repeated expected experimentation.  

Explanation:

hope this helps

Answer:

0

Explanation:

If you mix NH3 and H2O the reaction is NH3 + H2O → NH4OH not NH3OH.

Te equation, like that is balanced. There is 1 N, 5H and 1 O in the reactives and 1 N, 5 H and 1 O so you have the same number of elements in the reactives and products, thus it's balanced and you don't need to do anything

This type of questions is relationed with REDOX balanced

Answer:

It's Effective Collision.

Explanation:

Hope my answer has helped you!

Answer:

0.00663 grams/liter

Explanation:

HCl is a mineral acid with a molar mass of 36.46 g/mol.

No. of moles= mass/RMM

Making mass the subject of the formula:

Mass=Number of moles × RMM

Therefore 0.00040 mol HCl has a mass of:

0.00040 mol × 36.46 g/ mol

=0.01458 grams.

0.01458 grams are in 2.2 liters, Therefore 1 liter will have

0.01458 grams/2.2 liters= 0.00663 grams

concentration= 0.00663 grams/liter

Answer:

the answer is 0.00663 grams/liter

Explanation:

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Answer:

Explanation:

4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)​.

It is clear that 4 mol of Fe react with 3 mol of O₂ to produce 2 mol of Fe₂O₃.

no. of moles of Fe = mass/molar mass = (35.8 g)/(55.845 g/mol) = 0.64 mol.

Using cross multiplication:

4 mol of Fe is needed to react with → 3 mol of O₂, from stichiometry.

0.64 mol of Fe is needed to react with → ??? mol of O₂.

∴ The no. of moles of O₂ needed = (3 mol)(0.64 mol)/(4 mol) = 0.48 mol.

It is known that 1 mole of any gas occupies 22.4 L at standard P and T (STP).

Using cross multiplication:

1 mol of O₂ occupies → 22.4 L, at STP conditions.

0.48 mol of O₂ occupies → ??? L.

∴ The no. of liters of O₂ = (0.48 mol)(22.4 L)/(1 mol) = 10.752 L.

12×C(NaOH)=16×0.15

C(NaOH)=(16×0.15)÷12=0.2

Answer: 2) 0.20M

Answer:

- contains oxygen

- provides warmth

- blocks harmful energy from the Sun

Explanation:

The atmosphere is crucial when it comes to providing living conditions on Earth. The gases in the atmosphere manage to balance the things just about right, so that the life can thrive. The atmosphere has oxygen, the gas that is used by pretty much every organism to be able to function. With its greenhouse gases, the atmosphere manages to trap the heat inside, thus providing warmth to the Earth. The numerous layers of the atmosphere manage to block in big portion the harmful energy from the Sun, with a special accent on the ozone layer, a layer that manages to stop most of the UV radiation.

Answer: Contains oxygen, provides warmth, blocks harmful energy from the Sun

Explanation:

it they main important to live on earth

Answer:

(c) They come apart or lose their shape

Explanation:

Heat and temperature disrupt the attractions of the groups in the side chains that give the protein its characteristic shape.

(a) and (b) are wrong. The proteins do not lose their amino acids or their sequence.

(d) is wrong. The amino acids do not change into fatty acids.

Final answer:

To fully react with 12.8 moles of magnesium bromide in a single displacement reaction, 25.6 moles of potassium are needed, based on a typical reaction where 2 moles of potassium react with 1 mole of magnesium bromide.

Explanation:

To answer the question, of how many moles of potassium are needed to react completely with 12.8 moles of magnesium bromide, we need to reference the chemical equation that describes the reaction between potassium (K) and magnesium bromide (MgBr₂). However, without the specific reaction provided, a direct stoichiometric relationship is difficult to establish. For simplicity, let's assume a common type of reaction where potassium displaces magnesium from magnesium bromide, which is a single displacement reaction.

In a typical displacement reaction, potassium would react with magnesium bromide to form potassium bromide (KBr) and free magnesium (Mg). The equation might look something like 2 K + MgBr₂  → 2 KBr + Mg. Here, you can see that 2 moles of potassium react with 1 mole of magnesium bromide. Therefore, to react with 12.8 moles of MgBr₂, you would need 2 times that amount of potassium because the molar ratio of K to MgBr₂ is 2:1.

So, 25.6 moles of potassium are needed to react with 12.8 moles of magnesium bromide. It's important to remember that this answer is based on the assumption of a specific reaction type, and actual reactions may vary.

Explanation and answer:

The molar volume of a gas is 22.4 L at 0 deg. C.

So the molar mass of the gas is, by proportion,

0.16 g * (22400 mL)/(240 mL) = 14.93 g

The molar mass of (CH4)n = 12+4(1) = 16.

So n = 15.93/16 = 1, or the molecular formula is CH4.

Note: The temperature at which the volume was observed was not given.  If 240 cm^3 was observed at 20 deg.C, then the volume at 0 deg.C would be

V=240*(273+0)/(273+20) = 223.6

The molar mass = 0.16*22400/(223.6) = 16.03

which gives n = 16/16.03 = 1 again, but more accurately.

Upon heating copper(II) nitrate, black-colored copper(II) oxide forms as a solid residue; brown fumes of nitrogen dioxide are released, and oxygen gas is also evolved.

When copper(II) nitrate is heated, you would observe the compound decomposing into copper(II) oxide (CuO), nitrogen dioxide (NO₂), and oxygen (O₂). Copper(II) oxide is a solid with a black color and would be visible as a residue. Nitrogen dioxide is a gas with a characteristic brown color, which would be noticeable as brown fumes evolving from the reaction mixture.

Additionally, you might see the release of oxygen gas, though it is colorless and would not be visibly noticeable without testing for its presence (such as by introducing a glowing splint, which would re-ignite in the presence of oxygen).

When 0.5113 g of ammonia react with excess oxygen, -6.795 J of heat are released.

Enthalpy, a property of a thermodynamic system, is the sum of the system's internal energy and the product of its pressure and volume.

4 NH₃(g) +5 O₂(g) ⇒ 4 NO(g) + 6 H₂O   ΔH = -905.4J​

The molar mass of NH₃ is 17.03 g/mol.

0.5113 g × 1 mol/17.03 g = 0.03002 mol

According to the thermochemical equation, -905.4 J are released upon the reaction of 4 moles of ammonia.

0.03002 mol × (-905.4 J/4 mol) = -6.795 J

When 0.5113 g of ammonia react with excess oxygen, -6.795 J of heat are released.

Learn more about enthalpy here: https://brainly.com/question/11628413

This is how a reaction equation is set up:

Reactants ------> Products

This means that the answer is B) Products are located to the right of the arrow (aka the yield)

Hope this helped!

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An isomer of pentane has the same molecular formula but different structure. Pentane has three isomers. Structural formula H-C-C-C-H represents propane, which is not an isomer of pentane due to having a different molecular formula.

An isomer is a compound with the same molecular formula but a different structure. Pentane is an organic compound with the molecular formula C5H12 and has three isomers. These isomers are 2-methylbutane (also known as isopentane) and 2,2-dimethylpropane (also known as neopentane).

The structural formula that does not represent an isomer of pentane would be the one with a different molecular formula such as H-C-C-C-H which represents propane, a hydrocarbon with the molecular formula C3H8. Propane is not an isomer of pentane as it has a different molecular formula hence a different number of carbons and hydrogens.

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Answer:

Depending on the definition of "standard" conditions, the volume of O₂ required here will be either

Explanation:

Relative atomic mass data from a modern periodic table:

How many moles of iron Fe in that 35.8 gram of iron metal?

[tex]M(\mathrm{Fe}) = \rm 55.845\; g\cdot mol^{-1}[/tex].

[tex]\displaystyle n = \frac{m}{M} = \rm \frac{35.8\; g}{55.845\; g\cdot mol^{-1}} = 0.641060\; mol[/tex].

How many moles of oxygen gas will be required?

Consider the ratio between the coefficient of Fe and that of [tex]\mathrm{O_2}[/tex] in the equation:

[tex]\displaystyle \frac{n(\mathrm{O_2})}{n(\mathrm{Fe})} = \frac{3}{1} = 3[/tex].

As a result,

[tex]\displaystyle n(\mathrm{O_2}) = n(\mathrm{Fe}) \cdot \frac{n(\mathrm{O_2})}{n(\mathrm{Fe})} = \rm 0.641060\; mol \times 3 = 1.92318\; mol[/tex].

What's the volume of that [tex]\rm 1.92318\; mol[/tex] of oxygen gas under STP?

One mole of an ideal gas occupies a volume 22.4 Liters under STP (or 22.7 liters in certain textbooks.) The volume of an ideal gas is directly related to the number of moles of particles in this gas. Assume that oxygen acts like an ideal gas under STP. As a result, 1.92318 moles of oxygen will occupy a volume of either

[tex]\rm 1.92318\; mol \times 22.4\; L\cdot mol^{-1} = 43.1\; L[/tex] or

[tex]\rm 1.92318\; mol \times 22.7\; L\cdot mol^{-1} = 43.7\; L[/tex].

Explanation:

As the given electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}[/tex]. This shows that there are in total 35 electrons and 7 valence electrons.

Also, we know that bromine is the element that has atomic number 35. And, since it belongs to group 17 so it has 7 valence electrons.

Thus, we can conclude that the given element is bromine.

The element with the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ is Bromine. This can be deduced by counting the total number of electrons, which is 35. Bromine is in Group 17 and Period 4.

The element with the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ is Bromine (Br). To determine this, you can count the total number of electrons, which add up to 35. Bromine is located in Group 17 (VIIA) and Period 4 of the periodic table.

Here is a breakdown of the electron configuration:

Adding these up results in a total of 35 electrons, confirming it is Bromine.

Complete Question - What is the element with the following electron configuration? 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵

Answer:

By increaing the size of container

Explanation:

Gay-Lussac Law:

This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.

Mathematically,

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]  (at constant volume )

where,

[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.

[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.

So in order to decrease the pressure of the gas in container decrease the temperature of the gas present in the container due to which pressure of the gas will also get decrease as per as Gay-Lussac law.

The Answer is 9460 kJ (C)

The other answer is cap

Answer:

Choice A: Approximately [tex]5.23 \times 10^{-29}[/tex] joules.

Explanation:

Apply the famous mass-energy equivalence equation to find the energy that correspond to the [tex]\rm 5.81\times 10^{-29}[/tex] kilograms of mass.

[tex]E = m \cdot c^{2}[/tex],

where

The speed of light in vacuum is a constant. However, finding the right units for this value can simplify the calculations a lot. What should be the unit of [tex]c[/tex]?

The mass given is in the appropriate SI unit:

Mass is in kilograms.

Thus, proceed with the speed of light in SI units. The SI unit for speed is meters per second. For the speed of light, [tex]c \approx \rm 3.00\times 10^{8}\;m\cdot s^{-1}[/tex].

Apply the mass-energy equivalence:

[tex]\begin{aligned} E &= m \cdot c^{2} \\ &= \rm 5.81\times 10^{-29}\; kg \times {\left(3.00\times 10^{8}\; m\cdot s^{-1}\right)}^{2}\\ &\approx \rm 5.23\times 10^{-12}\;kg\cdot m^{2}\cdot s^{-2} \end{aligned}[/tex].

The unit of energy is not in joules. Don't be alerted. Consider the definition of a joule of energy. One joule is the work done on an object when a force of one newton acts on the object in the direction of the force through the distance of one meter. (English Wikipedia.)

[tex]\rm 1\; J = 1\; N \times 1\; m[/tex].

However, a force of one newton is defined as the force required to accelerated an object with a mass of one kilogram (not gram) at a rate of one meter per second squared. (English Wikipedia.)

[tex]\begin{aligned}\rm 1\; J &= \rm 1\; N \times 1\; m\\ & = \rm \left(1\; kg\times 1\; m\cdot s^{-2}\right)\times 1\; m\\ &= \rm 1\; kg \cdot m^{2}\cdot s^{-2}\end{aligned}[/tex].

In other words, the mass defect here is also [tex]\rm 5.23\times 10^{-12}\; J[/tex].

Answer: 5.23*10^-12 j

Explanation:

Answer:

=154.8 J

Explanation:

The rise in temperature is contributed by the change in temperature.

Change in enthalpy = MC∅,  where M is the mass of the substance, C is the specific heat capacity and ∅ is the change in temperature.

Change in temperature = 100.0°C-20.0°C=80°C

ΔH=MC∅

The specific heat capacity of gold= 0.129 J/g°C

ΔH= 15.0g×0.129J/g°C×80°C

=154.8 J

Answer:

When you stir a solute, more surface area of the substance is exposed to the solvent.

Explanation:

The higher the surface area in relation to volume is, the faster a solute will dissolve.

Hope it helps

Answer:

Try it and see. My guess is that stirring would increase the rate of dissolution.

Explanation:

So get 2 beakers, fil them up with 10 g salt, and add 100 mL water. Put a magnetic follower in one of the beakers, place it on a stirrer and let it rip. Measure the time, and see if the unstirred beaker still has solute on the bottom.

Answer:

1.24274 miles; 3.2186818249471 kilometer; 3218.6818249471002673 meters; 321868.18249471002491 centimeters; 3218681.8249471001327 millimeters; 3218681824.9471006393 micrometers; 3218681824947.1000977 nanometers;  2.18722240048120917 yards; 6.56166720144 feet; 7.87400064173235 inches; 1.079911535 nautical mile.

Answer:

2000 meters

Explanation:

because 2 kilometers equals 2000 meters

Answer:

enthalpy

Explanation:

If it is used with a triangle in front, (delta H), that means the change in enthalpy. Delta H= (m)(s)(Delta T).  m=mass of products, s=heat of the products, Delta T = change in temperature.

Hope that helps

Answer:

it can be

Explanation:

because the concentration of a solution will not affect the volume of it

Answer:

It is possible for the object/food to have been infected/contaminated

Explanation:

If you where to be eating while doing chemistry, it is possible that some of the things you are experimenting with might have gotten on some of the things around, or come off your hands onto the thing.

Answer:

While performing chemistry experiments one should not eat food while performing the experiments as harmful chemicals can be ingested into mouth along with the food.

There are various types of chemical and substances present in lab which might be harmful for person performing experiment.

One can also get disturbed and might spill chemicals on himself which can be harmful.

Answer:

Mass and distance affect the gravitational attraction between objects.

Explanation:

Answer:

Its Mass

Explanation: