What is the oxidation number for Zn(OH)4 2-?

Answers

Answer 1
Answer:  Zn(OH)4= ; -2 = -4 + ?, Zn = +2 , the -4 is the charge on the 4 OH- ions. 

NO3- + 6 H2O + 8 e- -------> NH3 + 9 OH- 
( Zn + 4 OH- ----> Zh(OH)4= + 2e-) x 4 
7 OH- + NO3- + 4 Zn + 6 H2O -------> NH3 + 4 Zn(OH)4

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The maximum energy available for useful work from a spontaneous reaction(A) free energy (B) lattice energy (C) kinetic energy (D) activation energy (E) ionization energy
Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI
A solution has which of the following properties
One isotope of a metallic element has a mass number 65 and 35 neutrons in the nucleus. The cation derived from the isotope has 28 electrons. What is the charge of this cation?
Complete the first row in the table by filling in the missing information about a system at equilibrium.A:Q < KeqQ > KeqQ = Keq

Describe meteor showers​

Answers

Answer:

a rain of asteroids coming from space

Explanation:

Meteor showers occur when dust or particles from asteroids or comets enter Earth's atmosphere at very high speed. When they hit the atmosphere, meteors rub against air particles and create friction, heating the meteors. The heat vaporizes most meteors, creating what we call shooting stars.

The point at which a substance is at complete equilibrium is called? User: a hydrogen bond is a special form of what type of bond

Answers

I don't know what the answer to your first question is. All of my teachers have only called it the equilibrium point.  However for your second question, a hydrogen bond is a special type of dipole-dipole attraction.  Only oxygen, nitrogen, and fluorine are able to make them when bonded with hydrogen.  Hydrogen bonding is what makes water have such a high boiling point considering how light the molecule is.

If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced? 3H2 + N2 --> 2NH3

Answers

If we have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, 39.66g ammonia is produced.

What is mole concept?

Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.

Given,

3H₂ + N₂ --> 2NH₃

3.50 moles of hydrogen

5.00 moles of nitrogen

Limiting reagent for the reaction is H₂.

3 moles of H₂ produce 2 moles NH₃

1 moles of H₂ produce 2/3 moles NH₃.

3.5 moles of H₂ produce (2÷3)×3.5 moles NH₃ = 2.33 moles

1 mole of NH₃ = 17g of NH₃

2.33 mole of NH₃ = 39.66g of NH₃

Therefore, If we have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, 39.66g ammonia is produced.

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If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, how much ammonia (in grams) is produced?
3H2 + N2 --> 2NH3
 3.5 moles H2 (2 moles NH3/3 moles H2) (17 grams NH3/1 mole NH3) = 40 grams NH3

What is the main cause for global wind patterns?A) currents in the ocean affect the air above it

B) unequal heating of different parts of earth

C) differences in elevation on different landmasses

D) greenhouse gases

(no guessing please )

Answers

B

sometimes the earths heating of the surface is unequal forming global wind patterns

Insulin is a protein that is used by the body to regulate both carbohydrate and fat metabolism. a bottle contains 425 ml of insulin at a concentration of 20.0 mg/ml . what is the total mass of insulin in the bottle?

Answers

Answer is: mass of insulin in the bottle is 8500 milligrams or 8.5 grams.

V(insulin) = 425 ml; volume of solution.
d(insulin) = 20.0 mg/ml; density of solution.
m(insulin) = V(insulin) · d(insulin).
m(insulin) = 425 ml · 20 mg/ml.
m(insulin) = 8500 mg.
m(insulin) = 8500 mg ÷ 1000 ml/l.
m(insulin) = 8.5 g.

Chemistry is best defined as the study of what

Answers

the science that systematically studies the composition, properties, and activity of organic and inorganic substances and various elementary forms of matter.

basically studying chemicals

Final answer:

Chemistry is the study of the properties, composition, and structure of substances, and the transformations they undergo. It also deals with the energy exchanges in these processes. As "The Central Science", chemistry interrelates with numerous other scientific disciplines.

Explanation:

Chemistry, often referred to as "The Central Science", is a branch of science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes. It plays a vital role in multiple disciplines such as biology, medicine and environmental science. It allows us to understand the makeup of substances, from the atomic level to complex molecules, and how they interact through chemical reactions.

One example of a branch of Chemistry is thermochemistry, which focuses on relationships between heat, work, and other types of energy in physical and chemical processes. Dalton's atomic theory, investigating quantitative and qualitative aspects of chemistry, also developed the concept of atomic mass units, allowing for the calculation of formula mass and the quantitative description of substances.

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