define Redox reaction ​

Answer:

option d

Explanation:

isotope means atoms with different mass no. 17 and 18 written on the left represent mass number

this is because atoms can differ in mass no.

Answer:

See below.

Explanation:

A dynamic equilibrium in chemistry refers to a situation in which the reaction of reactants to form product(s) in which the products can reverse the reaction by falling apart and back to the reactants.  Reactions that go to completion are irreversible.  In cases where reactants form products (in a forward reaction), but the products can change back into reactants (in a reverse reaction) are called reversible.

An example is the reaction of carbon dioxide with water to form carbonic acid (think soft drinks).

     CO2(g)+H2O(l) ⇌ H2CO3(aq)

As anyone who has opened a warm can of soda knows, it can erupt suddenly and spray anyone nearby with a shower of bubbly, and sticky, soda.  Carbonic acid is unstable and will happily decompose back to it's reactant molecules if given the chance.

Experience tells us what to expect when giving a brother or sister a can of warm soda that you've shaken hard for a minute.  But if you are a chemist, such responses aren't always easy to predict with a new reaction.  Equilibrium constants were developed to provide a means for presdicting the exstent of these reactions.  They are used in equilibrium equations to predict the concentrations of products and reactants, given conditions of temperature and pressure, under defined conditions of temperature and pressure.

The equations themselves include concentrations as the key input.  In the carbonic acid example, if one were to add excessive amounts of one of the reactants, one would expect the equilibrium to "shift to the right."  This simply means that more carbonic acid would be made.  The chances of the forward reaction increase as concentration increases.  The amount of CO2 given off as a gas depends on the concentration of the CO2 in the gas phase, which is given by the partial pressure of the gas.

The space above the soda and the cap represents one place that the CO2(g) can escape the solution.  The CO2 pressure in the gas phase is a measure of it's concentration.  An equilbium calculation takes this concentration in account when decidng how much much of each component is present.  Other compouns that are present may also impact the equilibrium since they may interfere with one of the reaction steps.  Pressure and emperature either dirctly impact the concentration (e.g., gases) or they affect the "effective" concentrations of the compunds.  A higher temperature creates more collisons between reactant molucules that may change the equilibrium constant..

Answer:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Explanation:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Answer:

105m

Explanation:

u=20m/s

g=10m/s^2

t=3s

s=ut+1/2gt^2at

s=20*3+1/2*10*3*3

s=105m

Answer:

118 neutrons

Explanation:

There are three subatomic particles in an atom namely: electron, neutron and proton. The mass number of an atom is calculated by adding the proton no. (atomic mass) + neutron no.

That is;

Mass no. = proton no. + neutron no.

This means that to obtain the neutron no. in the atom of an element, we subtract the no of protons or atomic mass from the mass number.

According to this question, Plutonium-196 is said to have an atomic number of 78. The mass no. is 196, hence, the number of neutrons is:

196 - 78

= 118 neutrons.

Approximately 13836 grams (or 13.8 kg) of liquid water is required to absorb 3.12×10^4 kJ of heat energy on boiling.

To find the mass of liquid water required to absorb 3.12×10^4 kJ of heat energy on boiling, we need to use the following formula:

q = m * ΔH

Where

The enthalpy of vaporization of water is 40.7 kJ/mol.

To convert kJ to J, we multiply by 1000:

q = 3.12×10^4 kJ = 3.12×10^7 J

Substituting the values, we get:

3.12×10^7 J = m * (40.7 kJ/mol)

To solve for the mass of water, we need to first convert the enthalpy of vaporization to J/g:

40.7 kJ/mol = 40.7×10^3 J/mol

The molar mass of water is 18.015 g/mol, so we can calculate the enthalpy of vaporization per gram:

40.7×10^3 J/mol / 18.015 g/mol = 2257 J/g

Substituting this value, we get:

3.12×10^7 J = m * (2257 J/g)

Solving for m, we get:

m = 3.12×10^7 J / (2257 J/g)

m ≈ 13836 g

Therefore, approximately 13836 grams (or 13.8 kg) of liquid water is required to absorb 3.12×10^4 kJ of heat energy on boiling.

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Answer:

4.73L

Explanation:

first convert the temp to kelvin by adding 237

then by applying combined gas law

will get the new volume

Based on the given information, it is possible that the mineral with the weaker reaction is a feldspar mineral, specifically an orthoclase or plagioclase feldspar.

The weaker reaction of a mineral with dilute hydrochloric acid (HCl) suggests that the mineral is likely composed of a mineral group that is less susceptible to acid dissolution. One such mineral group is the feldspar group.

Feldspar minerals, such as orthoclase and plagioclase, are commonly found in light-colored rocks and have a moderate to weak reaction with dilute HCl. They typically show a faint effervescence or no reaction at all when HCl is applied.

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Answer:

D. Hydrogen and chlorine

Explanation:

Answer:

d

Explanation:

hydrogen and chlorine

is the compound of hydrochloric acid

The empirical formula of ferrocene would be  Fe(C5H5)2

To determine the empirical formula of ferrocene, we need to find the simplest whole number ratio of atoms in the compound.

First, we can assume that we have 100g of the compound, which means we have:

5.42g of H

64.56g of C

30.02g of Fe

Next, we need to convert the mass of each element into moles using their respective atomic masses:

Now we need to find the ratio of the elements in the compound by dividing the number of moles of each element by the smallest number of moles:

H: 5.38 mol / 0.537 mol = 10.0 (rounded to one decimal place)

C: 5.37 mol / 0.537 mol = 10.0 (rounded to one decimal place)

Fe: 0.537 mol / 0.537 mol = 1.0

The ratio of elements in the compound is approximately 10:10:1, which means the empirical formula of ferrocene is Fe(C5H5)2.

Therefore, the empirical formula of ferrocene is Fe(C5H5)2.

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The empirical formula of the compound is H1.94S1, which can be simplified to approximately H2S. This suggests that the compound consists mainly of hydrogen and sulfur and is likely hydrogen sulfide (H2S).

To determine the identity of the compound with 2.00% hydrogen, 32.7% sulfur, and 65.3% of another element, we can analyze the mass percentages of each element and use that information to find the empirical formula.

Given:

Percentage of hydrogen (H) = 2.00%

Percentage of sulfur (S) = 32.7%

Percentage of another element = 65.3%

Assuming a 100g sample of the compound, we can calculate the mass of each element:

Mass of H = 2.00% of 100g = 2.00g

Mass of S = 32.7% of 100g = 32.7g

Mass of the other element = 65.3% of 100g = 65.3g

Now, we need to convert the masses into moles to determine the mole ratio of each element in the compound. We can use the molar masses of hydrogen (H = 1.01 g/mol) and sulfur (S = 32.07 g/mol).

Moles of H = Mass of H / Molar mass of H = 2.00g / 1.01 g/mol = 1.98 mol

Moles of S = Mass of S / Molar mass of S = 32.7g / 32.07 g/mol = 1.02 mol

Moles of the other element = Mass of the other element / Molar mass of the other element = 65.3g / (molar mass of the other element)

Now, we can determine the mole ratio between the elements by dividing each mole value by the smallest number of moles (which is 1.02 mol):

Moles of H / 1.02 mol = 1.94

Moles of S / 1.02 mol = 1.00

Moles of the other element / 1.02 mol = (mole ratio of the other element)

Based on the mole ratios, we can see that the mole ratio of hydrogen to sulfur is approximately 1.94:1 and the mole ratio of sulfur to the other element is 1:1.

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Having strong metallic stability makes a metal less likely to corrode.

A metal's reactivity happens because of its location in the reactivity series or the electrochemical series.

Lower in the series metals are more stable and less likely to corrode, whereas, metals tht are higher in the series metals are more reactive and more prone to corrosion.

Gold and platinum are seen as very stable metals and are resistant to corrosion. This is because they are lower in the series of metals.

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The best short summary for a flashlight is A flashlight is a portable, battery-operated device which makes light.

Option(D)

The best short summary for a flashlight is D: "A flashlight is a portable, battery-operated device which makes light." This sentence accurately describes the key features of a flashlight, which is a hand-held device that produces light by using batteries to power a bulb or LED. Flashlights are commonly used for illumination in low-light conditions, such as during power outages, camping trips, or outdoor activities. They come in a variety of sizes and designs, ranging from small keychain lights to large, heavy-duty models used by emergency responders. Some flashlights also offer additional features, such as adjustable brightness settings, strobe modes, or water resistance. The sentence "A flashlight is a portable, battery-operated device which makes light" succinctly captures the essential characteristics of this ubiquitous tool.  Option(D)

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Answer:

On Sept. 15, 2020, NASA, in partnership with Future Engineers, launched the Artemis Moon Pod Essay Contest. The contest, which is open to all (public, private, and home school) students in grades K-12, asks participants to imagine they are leading a one-week expedition to the Moon’s South Pole. In the essay, students will need to describe to NASA what (and who) they would bring to help make their expedition a success.

The Moon Pod Essay Contest is presented in support of NASA’s Artemis program. The student challenge is part of NASA’s efforts to engage the public in its missions to the Moon and Mars. NASA is returning to the Moon for scientific discovery, economic benefits, and inspiration for a new generation. Working with its partners throughout the Artemis program, the agency will fine-tune precision landing technologies and develop new mobility capabilities that allow robots and crew to travel greater distances and explore new regions of the Moon.

Explanation:

Answer:

I would bring some warm clothes to keep me warm through the night because South Pole is cold. I would also bring blankets and sticks to make a fire. I would bring my bestfriend to keep me company.

Explanation:

Answer:

B

Explanation:

Answer:

38

Explanation:

Symbol: Sr

Atomic mass: 87.62 u

Electrons per shell: 2,8,18,8,2

Atomic number: 38

Electron configuration: [Kr] 5s2

Van der Waals radius: 255 pm

Valence electrons: two

Answer:

C. a substance changing from the liquid state to the solid state.

Explanation:

Answer:

C

Explanation:

C

Answer:

It is in the same phase as the reactants.

Explanation:

i took the test

Some molecules in a substance have a high kinetic energy hence they are able to convert into vapor. These molecules exert pressure on the liquid surface.

We know that the molecules that compose matter are in constant random motion. The kinetic energy of all the molecules in the liquid are not the same. The molecules at the surface of the liquid posses more kinetic energy than the molecules below.

Some molecules of a substance have high enough kinetic energy to vaporize. These molecules exert  pressure on the substance.

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Answer:

Some molecules of a substance have high enough kinetic energy to vaporize. These molecules exert pressure on the substance.

Explanation:

Answer:

A climate change

Explanation:

the surrounding area would be effected in all ways imaginable, such as change in air, soil, water, plants, animals. and if you eat those said animals those harmful things can transfur into you

Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

Answer:

2,8,2

Explanation:

the element x has to be divalent I.e it has two electrons on its outer shell.

just look at the two at the end of 2,8,2

the compound formed is Xcl2

Replacement  I think, hope this helps ;)

Explanation:

Answer:

Replacement

Explanation:

The final temperature of the water is 43.92°C.

What is specific heat capacity?

The specific heat is defined as amount of energy in the form of heat to change heat content of 1 gram of substance by one-degree Celsius temperature.

Specific heat capacity of water = 4.184J/g°C

heat (q) = 437.7 J

Initial temperature = 23°C

Final temperature = T

mass of water = 5.00g

using the equation: q= mₓcₓΔT

437.7 = 5ₓ4.184ₓ(T- 23.0)

(T-23.0) = 437.7/ (5ₓ4.184)

T= 23.0°C +20.92°C = 43.92°C

T= 43.92°C

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Answer:

C

Explanation:

Answer:

The awnser is C: it tells you how much of a molecule IS up of each element.

Answer:

second law

Explanation:

Answer:

31.6%

Explanation:

find the molecular formular

(52×2)+(16×3)=152

since the %of oxygen is required

MF of o in Cr2O3 =16×3=48

%O= 48/152×100= 31.6%

An extremely efficient enzyme has a small KM and a large kcat.

The conversion rate at the lowest substrate concentration is measured in kcat/km. This interpretation is accurate. kcat/Km is a good indicator of an enzyme's effectiveness since it takes into account both the enzyme's maximum rate, kcat, and its affinity for its substrate (Km).The turnover number, or the number of molecules that may be created per second per active site, of an enzyme is provided by the formula k c a t / kM.Because the substrate concentration is almost usually much greater than the Km, in many situations, enzymes are only better when they have a larger kcat. It seems disingenuous to me to use the ratio when this is plainly the case, yet it still happens much too frequently. It could serve as a useful benchmark when compared to enzymes in particular situations.

complete question:An extremely efficient enzyme has a _____ KM and a _____ kcat.

A) small; small

B) small; large

C) large; large

D) large; small

E) kcat and KM do nothing to predict the efficiency of an enzyme

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The addictive quality is a reduction in vapour pressure.

The vapour pressure at a liquid's normal boiling point is the same as the ordinary atmospheric pressure, which is 1 atmosphere, 760 Torr, 101.325 kPa, or 14.69595 psi.

The pressure that results from liquids evaporating is known as vapour pressure. Surface area, intermolecular forces, and temperature are three often occurring variables that affect vapour press.

lower vapour pressure

raising the boiling point

Low-temperature depression

Osmotic force

They are all dependent on the solute; when you increase the solute, the colligative property and the ratio you added may change.

The Van't Hoff Factor is another option to examine (i). the number of dissolved ions. The colligative property will be further altered if the solute is ionic.

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