what is the valency and symbol of chromium ?​

Answers

Answer 1

Answer:

two valence states: trivalent chromium (Cr III) and hexavalent chromium (Cr VI)

hope this helps, i can change it if it doesn't.


Related Questions

4.
Solve: For each chemical equation below, write the number of product molecules that
will form from the reaction. Then circle the limiting reactant. (Note: The coefficients in
front of the reactants indicate the number of reactant molecules or atoms present.)

Answers

For all the reactions listed, the moles of products and limiting reactants are;

1. Molar cofficient - 6, oxygen is the limiting reactant

2. Molar coefficient - 8 chlorine is the limiting reactant

3. Molar coefficient - 4 and CO2 is the limiting reactant

What is a chemical reaction?

A chemical reaction is a combination of reactants that yields products. Recall that the limiting reactant is the reactant that nis present in the least amount.

Let us now complete each reaction;

1. The molar coefficient of the product in reaction 1 is 6 and oxygen is the limiting reactant

2. The molar For all the reactions listed coefficent of the product in reaction 2 is 8 and chlorine is the limiting reactant

3. The molar coefficient of the product in reaction 3 is 4 and the limiting reactant is CO2.

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uhh i need help please its sience not chemistri sorry just cant find sience in there

Answers

they can survive without oxygen, this is bio btw :)

I NEED THE AWNSER RIGHT NOWWWWW Four students categorized several environmental changes as short-term or long-term changes. Which chart correctly categorizes short- and long-term changes?

Answers

Based on the duration and effect of the environmental change, the correct categorization is as follows:

Short-term changes - Fire, flood, pollution of waterways, disease Long-term changes- extinction, early frost, deforestation, desertification

What are environmental changes?

Environmental changes refers to changes that occur in the environment either due to natural causes or by human activities.

Environmental changes can be categorized into:

short-term changes andlong-term changes

Short-term changes occur over a short period of time while long-term changes occur over a long period of time.

Based on the chart, the correct categorization is as follows:

Short-term changes - Fire, flood, pollution of waterways, disease Long-term changes- extinction, early frost, deforestation, desertification

Therefore, both long-term and short-term changes occur in the environment.

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If the equation: FeCl3+O2-->Fe2O3+Cl2, how many moles of chlorine gas can be produced if 4 moles of FeCl3 react with 4 moles of O2?

Answers

Answer:

6 moles of Cl2

Explanation:

First, the equation has to be balanced, which makes it 4 FeCl3 + 3 O2 --> 2 Fe2O3 + 6 Cl2

Using this information, we can see that one mole of O2 will not be present in the reaction. Since four moles of FeCl3 are needed to react in the equation, which would produce six moles of Cl2, and only four moles of FeCl3 are present, six moles of Cl2 would be produced.

How many moles of Oxygen gas are in a container that has a total volume of 33.0L at a pressure of 96.2kPa and a temperature of 35°C.

ideal gas constant= 8.31[tex]\frac{L(kPa)}{mol(K)}[/tex]

Answers

A 33.0-L container at 96.2 kPa and 35 °C contains 1.24 moles of oxygen.

What is an ideal gas?

An ideal gas is a hypothetical gas whose molecules occupy negligible space and have no interactions, and which consequently obeys the gas laws exactly.

First, we will convert 35°C to Kelvin using the following expression.

K = °C + 273.15 = 35 + 273.15 = 308 K

We want to calculate the number of moles of oxygen in a 33.0-L container at 96.2 kPa and 308 K. We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 96.2 kPa × 33.0 L / (8.31 l.kPa/mol.K) × 308 K = 1.24 mol

where,

P is the pressure.V is the volume.n is the number of moles.R is the ideal gas constant.T is the absolute temperature.

A 33.0-L container at 96.2 kPa and 35 °C contains 1.24 moles of oxygen.

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typical "lead" pencil is actually made from carbon. if the carbon in the pencil weighs 1.50 grams, the pencil has [atoms] atoms of carbon.

Answers

15g of carbon I believe but I’m not so sure



Calculate the mass percent of water in the formula:
MgSO4.7H20
Please help me and explain how you got it I gotta pass my chem class pls help!

Answers

Answer:

%H20=

(14xH)+(7xO)______________________________ X 100(Mg) + (S) + (4 x O) + (14 x H) + (7 x O)Thus,(14 x 1.008) + (7x16.0)______________________________________ X 10024.31 + 32.06 + (4x16.0) + (14 x 1.008) + (7x16.0)=126.122_____________ X 100246.482= 0.512 x 100=51.2%There is 51.2% of water is Magnesium Sulphate-7-water.

How did supporter of the Constitution convince opponents to approve it?

Answers

Add amendments specifically protecting individual liberties

Using the data below, what would be the independent variable?




Height of foam

Type of soda

Number of mentos

Color of mentos

Answers

Answer:

Number of mentos

Explanation:

i took the quiz

Select the correct answer below that correctly describes what a Arrhenius Acid Base reaction is.

Question 1 options:

An acid base reaction where one compound increases the amount of H+ or OH- in solution.

An acid base reaction where one compound is donating an H+ and one atom is accepting an H+

An acid base reaction where one compound is donating electrons and another compound is accepting electrons.

An acid base reaction where one compound is donating an OH- and one atom is accepting an OH-.

Answers

From the options, the statement ththat describes an acid - base reaction in the Arrhenius sense is; "an acid base reaction where one compound is donating an H+ and one atom is accepting an H+."

What is the Arrhenius definition?

The Arrhenius definition of a base is that a base is a substance that releases hydroxide ions as its only negative ions in solution. An acid is a substance that produces hydrogen ions as its only positive ions in solution.

If we look at the definitions shown here, the only one that accurately depicts acid - base reaction in the Arrhenius sense is "an acid base reaction where one compound is donating an H+ and one atom is accepting an H+."

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How many grams of bicarbonate will produce 40. Ml of co2 gas?

Answers

The reaction equation must first be put down and the stiochiometry is used to calculate the mass of the bicarbonate produced as 0.11 g.

What is a reaction?

A reaction refers to the transformation of reactants into products. We have the equation of this reaction as;

CO2 + H2O ---->H2CO3

If 1 mole of CO2 gas occupies 22400mL

x moles of CO2 occupies 40 mL

x = 0.0018 moles

If 1 mole of CO2 yields 1 mole of bicarbonate

0.0018 moles yields 0.0018 moles of bicarbonate

Mass of bicarbonate = 0.0018 moles * 61 g/mol = 0.11 g

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Approximate the solution to the equation using three iterations of successive approximation

Answers

A solution has to do with the presence of a solute where there is a homogenous mixture of different substances in order to get their limit of solubility.

What is an Iteration?

This refers to a method in organic chemistry where there is a sequence of reactions that are used to synthesize molecules.

Please note that your question is incomplete so I gave you a general overview to help you get a better understanding of the concept.

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what could have caused the change in the rock layers.

Answers

Answer: Changes in the environment

Explanation: the rocks are subjected to extreme heat and pressure, volcanic activities or movements on the Earth's surface.

A mixture of H2 and water vapor is present in a closed vessel at 20. 00°C. The total pressure of the system is 755. 0 mmHg. The partial pressure of the water vapor 17. 50 mmHg. What is the partial pressure of H2? Type in your answer using the correct number of significant figures. MmHg.

Answers

The partial stress of H2 is 737.47 mmHg Let's observe the Ideal Gas Law to find out the whole mols.

We count on that the closed vessel has 1L of volume

P.V=n.R.TWe must convert mmHg to atm. 760 mmHg.1 atm755 mmHg (755/760) = 0.993 atm0.993 m.1L=n.0.082 L.atm/mol.K .293 K(0.993 atm 1.1L)/(0.082mol.K /L.atm).293K = n0.0413mols = n

These are the whole moles. Now we are able to know the moles of water vapor, to discover the molar fraction of it.

P.V=n.R.T760 mmHg. 1 atm17.5 mmHg (17.5 mmHg / 760 mmHg)=0.0230 atm0.0230 m.1L=n.0.082 L.atm/mol.K.293 K(0.0230atm.1L)/(0.082mol.K/L.atm .293K)=n 9.58 × 10 ^ 4 mols = n.Molar fraction = mols )f gas/general mols.Molar fraction water vapor =9.58×10^ -four mols / 0.0413 molsSum of molar fraction =11 - 9.58 × 10 ^ 4 × mols / 0.0413 ×mols = molar fraction H20.9767 = molar fraction H2H2 pressure / Total pressure =molar fraction H2H2 pressure / 55mmHg = =0.9767 0.9767 = h2 pressure =755 mmHg.737,47 mmHg.What is a mole fraction?

Mole fraction is a unit of concentration, described to be identical to the variety of moles of an issue divided through the whole variety of moles of a solution. Because it's miles a ratio, mole fraction is a unitless expression.

Thus it is clear that the partial pressure of H2 is 737,47 mmHg.

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why electron configuration is important

Answers

Answer:

So that we know how many electrons are thre in which shell and how many shells are present in an atom....

Explanation:

Hope it helps!!!

which acid would produce the salt zn(no3)2

Answers

Answer:

Explanation:

Nitric Acid (HN03)

Zn(OH)2 + 2HNO3 ==> Zn(NO3)2 + 2HOH

The antibiotic prontosil, developed by bayer pharmaceuticals in 1932, was used in saving the life of president roosevelt's son from severe strep throat in 1936. protonsil consists of two nitrogens bonded together in a double bond. the left nitrogen is bonded to a benzene ring where the para position contains a sulfur double bonded to two oxygen atoms and single bonded to n h 2. the right nitrogen is bonded to a benzene ring where one ortho and the para position each have an n h 2 substituent. substituent prontosil is an azo dye, which can be prepared from an aryldiazonium ion and an aromatic compound. draw the structures of the diazonium ion and the coupling component for this drug

Answers

Prontosil is a compound produced by the coupled reaction of an aryldiazonium ion and an aromatic compound.

What are diazonium compounds?

These are organic compounds in which there are ionic interactions between the azo group (-N₂⁺) and an anion X⁻.

The general structure is RN₂⁺X⁻.

R is the lateral chain that might be an aromatic ring, among other options.N₂⁺ is the azo groupX⁻ is the anion

The azo group characterizes as being unstable and reactive. This property is because one of the N atoms has a positive charge.

-N⁺≡ N

What is the coupling reaction of aryldiazonium compounds?

Aryldiazonium salt reactions can occur in two ways,

Substitution reactionsCoupling reactions

Coupling reactions are the aromatic electrophilic substitution, where the aryldiazonium ion acts as an electrophile for an activated aromatic compound to attack it.

The coupling reaction occurs at the azo group level.

In the exposed example,

the benzene ring with sulfur bonded to oxygen atoms is the coupling componentthe benzene ring with NH₂ and the azo group is the diazonium ion

In the attached files you will find the drawings.

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If 25 milliliter of 0. 80 m hcl is used to completely neutralize 40. Milliliters of naoh solution, what is the molarity of the base?

Answers

If 25 milliliter of 0. 80M HCl is used to completely neutralize 40. milliliters of NaOH solution, the molarity of the base is 0.5M.

How to calculate molarity?

The molarity of a solution can be calculated using the following expression:

M1V1 = M2V2

Where;

M1 = molarity of acidM2 = molarity of baseV1 = volume of acidV2 = volume of base

25 × 0.80 = 40 × M2

20 = 40M2

M2 = 20/40

M2 = 0.5M

Therefore, if 25 milliliter of 0. 80M HCl is used to completely neutralize 40. milliliters of NaOH solution, the molarity of the base is 0.5M.

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Periodic Table: Why are group 1A elements called alkali metals?

Answers

Answer:

Explanation:

The elements in Group I of the periodic table are called alkali metals. They are called alkali metals because they react with water to form alkali solutions. These metals are very reactive; hence they have to be stored under oil to protect them from corrosion by air and waterwaterwater

The group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.

What are the alkali metals?

They are the metals that are soft, lustrous, and have a low melting point. Air and moisture react readily with alkali metals.

Special precautions must be taken when using and storing these metals due to their reactivity.

The seven alkali metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Thus, the group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.

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what is a water cycle​

Answers

Answer:

the cycle of water and how it evaporates with energy from the sun and the droplets are stored in clouds which is condensation and when it rains or snows those are forms of precipitation

Explanation:

Answer:

it shows the continuous movement of water within the earth and atmosphere

Calcium acetate reacts with sodium carbonate to produce calcium carbonate and sodium acetate

Answers

Answer:

(CH₃COO)₂Ca(aq) + Na₂CO₃(aq) = 2CH₃COONa(aq) + CaCO₃(s)

2CH₃COO⁻ + Ca²⁺ + 2Na⁺ + CO₃²⁻ = 2CH₃COO⁻ + 2Na⁺ + CaCO₃

Ca²⁺ + CO₃²⁻ = CaCO₃

Can someone please predict the products for these two? Also explain to me how you predicted it, thank you.

1) C₂H₂ + O₂ -->
2) C₂H₁₂ + O₂ -->

Answers

THESE ARE COMBUSTION REACTIONS SO, THE PRODUCT FOR BOTH OF THESE ARE CO2 AND H2O! Here is the balanced reaction equation:
1) C2H2 + 3O2 ➡️ 2CO2 + 2H2O
2) C2H12 + 5O2 ➡️ 2CO2 + 6H2O

what is the difference between bacteria and cancer cells​

Answers

Las bacterias son microorganismos procariotas que presentan un tamaño de unos pocos micrómetros y diversas formas, incluyendo esferas, barras, filamentos curvados y helicoidales.
Las células cancerosas son células que se dividen sin descanso, formando tumores sólidos o inundando la sangre con células anormales. La mitosis es un proceso normal utilizado por el cuerpo para el crecimiento y la reparación.

6. What is the mass of the object if the net force acting on it was 356 N and the acceleration rate
was 4 m/s/s2

Answers

The mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.

How to calculate mass?

The mass of an object can be calculated using the following formula:

F = ma

Where;

F = force (N)m = mass (kg)a = acceleration (m/s²)

m = F/a

m = 356/4

m = 89kg

Therefore, the mass of an object with a net force of 356N and an acceleration rate of 4m/s² is 89kg.

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POSSIBLE POINTS:

I perform a Haber Process reaction and I get 10.0g of NH3, if I was theoretically supposed to get 15.7g, what is my percent yield?

O 63.69 %

O 60 %

O 63.7%

O 64 %

1

2

3

4

5

6

7

8

9

10

Answers

Answer:

63.7

Explanation:

Percent yield is actual yield over theoretical yield. In this case, 10/15.7 = .637 = 63.7%.

Consider the following reaction in which all reactants and products are gases.


P4+6Cl2⟶4PCl3

A 100. ML reactor vessel is charged with 250. Mg of P4 and 4. 21 atm of Cl2 at 298 K. The reaction goes to completion.

How many moles of chlorine gas are initially in the vessel?

Answers

Based on the equation of the reaction, the moles of chlorine gas initially in the vessel is 0.12 moles

How many moles of chlorine were initially present?

The moles of chlorine initially present is determined using the equation of the reaction:

P4 + 6 Cl2 ⟶ 4 PCl3

At STP, 1 mole of P4 reacts with 6 moles of chlorine.

Molar mass of P4 = 124.0 g

Molar mass of chlorine = 71.0 g

Mass of P4 in reaction vessel = 250 mg = 0.25g

moles of P4 in 0.25 g = 0.25/124 = 0.02 moles

0.02 moles of P4 will react with 0.02 × 6 moles of chlorine = 0.12 moles of chlorine.

Therefore, the moles of chlorine gas initially in the vessel is 0.12 moles.

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A sample of aluminum chloride (AIC1z) has a mass of 37.2 g.
a. How many aluminum ions are present?
b. How many chloride ions are present?
c. What is the mass in grams of one formula unit of aluminum chloride?

Answers

The answers to your questions are as follows

A) The number of aluminium ions present = 1.62 * 10²³ ions

B) The number of chloride ions present = 9.86 * 10²³  ions

C) The mass of one unit of aluminium chloride = 133.34 grams

Given data :

mass of aluminium chloride = 37.2 g

molar mass of aluminium chloride = 133.34 g/mol

note : I mole of a molecule has 6 * 10²³ molecules  

Number of moles = mass / molar mass = 0.27 moles

Determine the number of aluminum ions and chloride ions present

A) aluminium ions present

moles of AlCl₃ * 6 * 10²³

= 0.27 * 6 * 10²³   = 1.62 * 10²³ ions

B) Chloride ions present

moles of AlCl₃ * 6 * 10²³  * 3

= 0.27 * 6 * 10²³ * 3

= 4.86 * 10²³ ions

C) The mass of one formula unit of aluminium chloride = 133.34 grams

Hence we can conclude that the answers to your question are as listed above.

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Will autoionization of water be spontaneous at high temperatures

Answers

Answer:

100

Explanation:

Will autoionzation of water be spontaneous at high temperature

Between which atoms do hydrogen bonds form in water?
A) Oxygen and hydrogen atoms in the same water molecule
B) Oxygen and hydrogen atoms in different water molecules
C) Hydrogen atoms in the same water molecule
D) Oxygen atoms of different water molecules

Answers

Answer:

right answer is A bcz

Explanation:

In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond.

Answer:

oxygen and hydrogen indifferent molecules

What are the examples of 8 branches of chemistry?

Answers

Answer:

hmm suspicious

lol I don't know bye

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