What is a calcite?
1. mineral
2. erosion
3. marble
4. aragonite
I had no idea what subject I have to put it on. 0_0
HELP ASAP

Answer:

386.75 grams

Explanation:

You can use dimensional analysis to help you solve for this question

1. set up a proportion

                          x grams

4.25 mol x        x mole

2. to find the amount of grams/mol that are in NiS we find the gram formula mass (mass of all the atomic masses of each element)

Ni- 59 grams

S- 32 grams

add these together and you get 91 g/mol

3. now plug in the values and multiply across

                    91 grams

4.25 mol x     1 mole

when you multiply across this is equal to 386.75 grams

Answer:

this is an Oxidation-reduction

Explanation:

like is w reducing agent, N2 is an oxidizing agent

The mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g

According to this question, an empty beaker has a measured mass of 27.234g. However, when some salt is added to the beaker, the combined mass is 35.9564g.

This means that to calculate the mass of the salt in the beaker, we have to subtract the mass of the empty beaker from the combined mass as follows:

mass of salt only = 35.9564g - 27.234g

mass of salt only = 8.7224g

Therefore, the mass of the salt only if 35.9564g is the combined mass of the beaker and the salt is 8.7224g.

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Answer:

∆H or Enthalpy of the reaction

Explanation:

If ∆H is +ve

If ∆H is -ve

Answer: D. Fusion reactions in the sun convert small amounts of mayter into large amounts of energy.

Answer:

im guessing its A run off

Explanation:

Answer: Run off

Explanation:

Wetlands have plants that clean water through. As water flows into a wetland it encounters the the plants growing there. This slows the water down making it less likely to cause erosion. The nutrient pollutants nitrogen and phosphorus are absorbed by the roots of the plants.

Answer:

option B = 0.410 g

Explanation:

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Answer:

Na+

Explanation:

it is least pull by the nuclear charge

Answer:

Na+

Explanation:

It is posetively charged and in the first column

Intensive properties do not change as the size of an object changes but Extensive properties change as the size of an object changes; here the properties can not change because the amount of the water stays the same

The physical properties of matter can be divided into  intensive and extensive properties and the terms are introduced in 1917 by Richard C Tolman.

Intensive properties are independent of the presence of number of substance and they are bulk properties, here the Characteristic doesn’t change.

The size of intensive properties cannot change, examples are Density, temperature, pressure etc. It can not depend on the amount of matter and also intensive properties are fixed, countable.

Extensive properties are dependent on the presence of  number of substance, easily identified, Size of Extensive properties changes and  It can be computed.

extensive properties depend on the amount of matter, often changes and are not countable; For example Volume, size, mass, length, weight

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For a (unbalanced) reaction: NaOH +CO2-Na2CO3 + H2O, the moles of NaOH and moles of each product are formed are mathematically given as

a) Moles of NaOH =44.05

b)   Moles of Na2CO3=21.0

Generally, the equation for the Chemical reaction  is mathematically given as

2 NaOH(aq)+ CO2(g)------> Na2CO3(aq)+ H2O(l)

Therefore

Moles of CO2= 925/44

Moles of CO2=21.0

Hence

Moles of NaOH = 2 x Moles of CO2

Moles of NaOH = 2x925/44

Moles of NaOH =44.05

In conclusion

Moles of Na2CO3 925/44

Moles of Na2CO3=21.0

And

Moles of H2O= 925/44

Moles of H2O= 21.0

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Answer:

When both liquid molecules are polar then they can attract one another - which leads to mixing (miscibility).

When the molecular liquid is nonpolar, then the water molecules attract only one another while ignoring the nonpolar liquid. the result is that the two liquids are immiscible.

Explanation:

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Answer:

They lack lack inter-molecular forces to disolve in the polar liquids.

Explanation:

Miscibility is the property of two substances to mix in all proportions (that is, to fully dissolve in each other at any concentration). Polar molecules like water will mix well with some other polar molecules but things like oil which are non polar do not mix well with polar molecules. This is because the oil and water lack inter-molecular forces to keep them mixed.

Answer:

3

Explanation:

PH = -Log [H+]

PH = -Log [1 × 10^-3]

PH = -Log [10^-3]

Log (10) = 1

PH = -(-3) Log (10)

PH = 3 × 1

PH = 3

Answer:

the correct answer is H2SO4 and HSO4-41

The time elapsed when the ball placed above the concave mirror and the image formed would be at the same location is 0.55 s.

The position of the image formed is determined using the followimg mirror formula;

[tex]\frac{1}{f} = \frac{1}{v} + \frac{1}{u}[/tex]

where;

f = R/2

f = 1.5/2

f = 0.75 m

When the ball and its image is in the same position, u = v

The position of the ball is calculated as;

[tex]\frac{1}{f} = \frac{1}{u} + \frac{1}{u} \\\\\frac{1}{f} = \frac{2}{u} \\\\u = 2f\\\\u = 2(0.75)\\\\u = 1.5 \ m[/tex]

The time taken for the ball to travel the caluclated distance is determined as;

h = ut + ¹/₂gt²

1.5 = 0  + ¹/₂(9.8)t²

1.5 = 4.9t²

t² = 1.5/4.9

t² = 0.306

t = 0.55 s

Thus, the time elapsed when the ball and its image are at the same location is 0.55 s.

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Explanation:

density=> ro=m/V

m=0,12kg

V=0,04m³=6,4.10^-5

=>0,12/6,4.10^-5=1875 kg/m³

The colors and the corresponding wavelengths the three types of cones detect are:

Human vision refers to the ability of humans to see and visualize objects in the environment in terms in texture, color, pattern, etc.

The cells of the human eye responsible for vision are the rods and cones.

The cones are responsible for color-vision while rods are responsible for black and white vision.

The three types of cones detect blue, green, and red colors corresponding to wavelengths given below:

Therefore, the cones in the eye detect blue, green and red colors.

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The amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.

The Ideal gas law states "that pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature of gas. It is expressed;

[tex]PV = nRT[/tex]

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant( [tex]R = 0.08206 Latm/molK[/tex]

Given the data in the question;

Volume; [tex]V = 4.32L[/tex]

Pressure; [tex]P = 1.45atm[/tex]

Temperature; [tex]T = -18^oC = 255.15K[/tex]

Amount of gas; [tex]n =\ ?[/tex]

To determine the moles of gas, we substitute our given values into the expression above.

[tex]PV = nRT\\\\1.45atm * 4.32L = n * 0.08206Latm/molK * 255.15K\\\\6.264Latm = n * 20.937609Latm/mol\\\\n = \frac{6.264Latm}{20.937609Latm/mol} \\\\n = 0.3mol[/tex]

Therefore, the amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.

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Both ionization energy and electron affinity are opposite processes to each other because of their functions.

The main difference between electron affinity and ionization energy is that electron affinity refers to the amount of energy released when an atom gains an electron while on the other hand, ionization energy is the amount of energy required to remove an outermost electron from an atom.

So we can conclude that both ionization energy and electron affinity are opposite processes to each other because of their functions.

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If 6 units of AB were reacted with 10 units of CD in the described equation, the limiting reactant would AB

They are reactants that determine how far a reaction can go in terms of yield.

From the equation: 3AB + 4CD --> 2AD + 6CB

The mole ratio of AB to CD is 3:4

Thus, 6 units of AB will require 8 units of CD.

But 10 units of CD were reacted with only 6 units of AB. This means that CD is in excess by 2 units while AB will limit the yield of the reaction.

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Take a example of water

Attached structure

Answer:

Explanation:

Calculate the pH of solution

that has

[H+]of 8.1 x10^-4

Answer:

d) I, III, and IV

Explanation:

rust, copper oxidation, and percipitate from a chemical reaction are all, well, chemical reactions.

Answer:

BaS would be a stable neutral molecule!

Reason:- All of the above.

Explanation:

In order to form a neutral molecule it's necessary to balance their charge first, The given components i.e. Ba2+(cation) and S2-(anion) have equal and opposite charges, when they combine they form predominantly ionic compound i.e. Sulphur partly shares it's 2 electrons with Barium and forms Barium sulphide.

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Answer:

H30,+ion is known as Hydroniom Ion

Explanation:

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Answer:

[tex]\fbox{Law -Based \: on \: laws \: of \: thermodynamic}[/tex]

Explanation:

At constant pressure Thermal energy always moves from a greater energy level to a lesser energy level, laws of thermodynamics prove that.

Nature always likes to attain equilibrium either it's movement of heat energy or flow of water from higher region to lower region. The first and second law of thermodynamics are profe of that, the first law says that the total energy of universe is Constant. Energy can not be destroyed it always changes from one form to another, by work and heat. The second law explains why thermal energy moves from a greater energy level to a lesser energy level, it deals with the change in entropy of a system and surrounding and states heat flows from hot environment to cold environment.

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This happens when the air is completely Saturated with water vapor at its dew point

Wet adiabatic lapse rate is the rate at which a saturated wet air cools down with increase in altitude through an adiabatic process. This is process is also known as saturated adiabatic lapse rate.

Hence we can conclude that This happens when the air is completely Saturated with water vapor at its dew point.

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Answer: saturated

Explanation:

For a voltaic cell consisting of chromium, an electrode dipped in a 1.20 M chromium (III) nitrate solution and a tin electrode dipped in a 0.400 M tin (II) nitrate solution, the cell potential at 298 K  is mathematically given as

Ecell = 0.577 V

Generally, the equation for the Oxidation and Reduction  is mathematically given as

Cr(s) ------------------ Cr+3(aq) + 3e- ] x 2 ...O

Sn+2(aq) + 2e- ------------ Sn(s) ] x 3  ...R

Reaction

 2 Cr(s) + 3 Sn+2(aq) --------------- 2 Cr+3(aq) + 3 Sn(s)

Therefore

Eicell = - 0.14 - ( - 0.74)

Eicell = 0.60

In conclusion

[tex]Ecell= E0cell - \frac{0.0591}{n} * \frac{log[Cr+3]^2}{ [ Sn+2]^3}[/tex]

[tex]Ecell = 0.60 - \frac{0.0591 }{6} \frac{log( 1.20)^2}{ ( 0.200)^3}[/tex]

Ecell = 0.577 V

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Explanation:

[tex]\longmapsto\: \green{ hello \: mate \: }[/tex]

Atomic weight of nitrogen is 23

Answer:

Socratic app

Explanation:

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