28 Which of the following compounds contains a transition metal? A. magnesium bromide (MgBr2) B. sodium chloride (NaCl) C. potassium hydride (KH) D. iron oxide (FeO)

QUESTION POSTED AT 14/02/2020 - 12:46 PM

Answered by admin AT 14/02/2020 - 12:46 PM

D iron oxide Fe is a transition metal

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Related questions

The solubility product constant for mg(oh2(s is 1.2x10^-11 calculate solubility of magnesium hydroxide in mol/l

27,632 would be the answer

ANSWERED AT 28/02/2020 - 04:29 PM


QUESTION POSTED AT 28/02/2020 - 04:29 PM

Nuclear energy is produced when scientists force uranium (U) atoms to break apart. With this in mind, examine the list below. If scientists were to break apart each of the items on the list, which items would still be classified in the same way? Which items would be classified differently? • atoms • elements • compounds • molecules • matter

Answer:

Compound.

Explanation:

A compound is a made up of two or more than two different elements. It can be broken down into smaller molecules.Elements are combined to form a compound by chemical bonding like ionic bonding and covalent bonding.

Different compounds of different elements can be broken down into the chemical reaction called decomposition reaction. For example:

Using electrolysis, we can break down water into its elements hydrogen and oxygen.    

ANSWERED AT 28/02/2020 - 04:06 PM


QUESTION POSTED AT 28/02/2020 - 04:06 PM

An atom of an element has 28 innermost electrons and 7 outermost electrons. In which period of the Periodic Table is this element located? 1. 5 2. 2 3. 3 4. 4

Answer: The given element belongs to Period 4.

Explanation:

We are given:

Number of innermost electrons = 28

Number of outermost electrons = 7

Total number of electrons = 28 + 7 = 35

Electronic configuration is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom is determined by the atomic number of that atom.

The electronic configuration of the element having atomic number '35' is:  1s^22s^22p^63s^23p^64s^23d^{10}4p^5

To identify the period, we look at the highest occupied principle quantum number which is 'n'. Here, the value of highest occupied shell or 'n' is 4.

Hence, the given element belongs to Period 4.

ANSWERED AT 28/02/2020 - 03:57 PM


QUESTION POSTED AT 28/02/2020 - 03:57 PM

How do you draw molecular compound structures? Example: C2H2

It's hard to describe how to draw these compounds. However, I will try my best using the example provided. The example provided would look like this H-C(triple bond)C-H. First it is important to know how many electrons you are working with. In this case there are ten electrons. 8 from carbon and 2 from hydrogen. After you know this, you can draw the structure. Each carbon atom needs an octet or eight atoms surrounding it. Creating a triple bond with the other carbon and a single bond with one hydrogen atom allows for this to happen. It takes practice to master drawing structures but with time it gets easier! I hope this helped! 

ANSWERED AT 28/02/2020 - 03:39 PM


QUESTION POSTED AT 28/02/2020 - 03:39 PM

What is the empirical formula for a compound that is a 83.7% carbon and 16.3% hydrogen

The empirical formula for a compound that is a 83.7% carbon and 16.3% hydrogen is CH2

ANSWERED AT 28/02/2020 - 03:23 PM


QUESTION POSTED AT 28/02/2020 - 03:23 PM

When you do a displacement reaction with iron and copper what is the orange metal called

It is called rust and it forms when water soaks into the metal forming a chemical reaction.

ANSWERED AT 28/02/2020 - 02:21 PM


QUESTION POSTED AT 28/02/2020 - 02:21 PM

Where in the body are nitrogen compounds found? a.proteins b.nucleic acids like DNA c.fats d.both a & b

I believe the answer is D. both a and b

ANSWERED AT 28/02/2020 - 12:31 PM


QUESTION POSTED AT 28/02/2020 - 12:31 PM

What is the difference between a mixture and a compound? (need an easy two sentence answer (able to explain it to a 8 your old).)

 A mixture is made from two or more substances that are chemically unlike and are not chemically joined. A compound is a substance formed when two or more elements chemically react with each other to ... substances because no new substance is formed, therefore they do not have any fixed properties.

ANSWERED AT 28/02/2020 - 12:02 PM


QUESTION POSTED AT 28/02/2020 - 12:02 PM

Explain the process of separating a mixture consisting of iron fillings and sand in a plastic bowl.

Answer: To separate the iron sand mixture we will use a magnet to get rid of the iron filings from the sand as a result of sand isn't drawn to the magnet. once separation, the elements of the mixture can have the identical composition and properties as they didn't begin with. Hence , magnet can be used for seprating a mixture of iron fillings and sand .

ANSWERED AT 28/02/2020 - 11:51 AM


QUESTION POSTED AT 28/02/2020 - 11:51 AM

One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body? A. 1 kilogram B. 500 grams C. 250 grams D. Practically none

The human body contains many salts, of which sodium chloride NaCl is the major one, making up around 0.4 per cent of the body's weight. So a 50kgperson would contain around 200g of sodium chloride - around 40 teaspoons. Since we lose salt whenever we sweat, it has to be continually replaced. Answer: C.

ANSWERED AT 28/02/2020 - 11:44 AM


QUESTION POSTED AT 28/02/2020 - 11:44 AM

Elements and compounds are 2 types of what?

Compounds. ... When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl). Hope it helped!

ANSWERED AT 28/02/2020 - 11:40 AM


QUESTION POSTED AT 28/02/2020 - 11:40 AM

The elements which make up water can only be separated by chemical means. That means water is __________. a. a mixture b. an element c. a solution d. a compound

Water is a compound because it is made up of two elements.

ANSWERED AT 28/02/2020 - 11:20 AM


QUESTION POSTED AT 28/02/2020 - 11:20 AM

The following two experiments are carried out with anhydrous potassium chloride and observations X and Y are made at the end of each experiment. Concentrated sulfuric acid is added to the potassium chloride and the fumes produced are bubbled into aqueous potassium iodide solution - observation X. The potassium chloride is dissolved in aqueous ammonia and this is then added to aqueous silver nitrate - observation Y. What are the observations X and Y?

Answer:

Observation X: The aqueous potassium iodide solution becomes yellow in color

Observation Y: A clear, colorless solution is observed.

Explanation:

Experiment 1

When Concentrated sulfuric acid is added to potassium chloride, hydrogen chloride gas is produced:

H₂SO₄ + 2KCl ⇒ 2HCl (g) + K₂SO₄

When the HCl gas is bubbled into aqueous potassium iodide, a redox reaction takes place at room temperature when energy is provided in the form of light:

4H⁺ + 4I⁻ + O₂ ⇒ 2I₂ + 2H₂O

The iodine causes the solution to become yellow in color (or darker yellow/brown at high concentrations of iodine).

Experiment 2:

When potassium chloride in aqueous ammonia is added to aqueous silver nitrate, the following net reaction occurs:

Ag⁺ + 2NH₃ ⇒ [Ag(NH₃)₂]⁺

The silver reacts with ammonia rather than chloride as ammonia is a better ligand in this case. The ammonia complex is soluble in water.

Thus, a clear, colorless solution will be observed.

ANSWERED AT 28/02/2020 - 10:48 AM


QUESTION POSTED AT 28/02/2020 - 10:48 AM

In the treatment of domestic water supplies, chlorine is added to the water to form chloric(I) acid,HClO. Cl2(aq) + H2O(I) → H+(aq) + Cl–(aq) + HClO(aq) The HClO reacts further to give the chlorate(I) ion.(CLO-) HClO(aq) + H2O(I) → H3O+(aq) + ClO–(aq) Both HClO and ClO–kill bacteria by oxidation. What is the change in oxidation number of chlorine in forming the chlorate(I) ion from the aqueous chlorine? PLEASE SHOW WORKING :)

Chlorine goes from Cl₂ to ClO⁻.

Oxidation state of Cl in Cl₂ is zero whereas in ClO⁻ it is +1. Hence change in oxidation state of Chlorine is 1.

Calculation of oxidation number of Cl in ClO⁻ or HClO⁻ :
Let x be oxidation number of Cl in ClO⁻ the. Now since the net charge on ClO⁻ is -1, sum of oxidation number of all must be equal to -1. 


Therefore,
x + (-2) = -1 .....[ oxidation number of O is -2]
∴ x = 2-1 = +1
Therefore oxidation number of Cl in ClO⁻ is +1

ANSWERED AT 28/02/2020 - 10:47 AM


QUESTION POSTED AT 28/02/2020 - 10:47 AM

What is the purpose of adding nahso3 at the end of the oxidation? write a balanced equation for the reaction it undergoes?

The purpose of adding NaHSO3 at the end of the oxidation is to quench the excess oxidizing agent NaOCl. 
NaHSO3 + NaOCl → NaCl + NaHSO4

ANSWERED AT 28/02/2020 - 10:33 AM


QUESTION POSTED AT 28/02/2020 - 10:33 AM

Is potassium a metal metalloid or nonmetal?

Answer:

potassium K is a metal

Explanation:

ANSWERED AT 28/02/2020 - 10:19 AM


QUESTION POSTED AT 28/02/2020 - 10:19 AM

Explain why are hydrogen and oxygen considered as wheares water as a compound?

Hydrogen and oxygen are different elements.

when two or more elements combine, they form a compound

hence, two molecules of hydrogen and one molecule of oxygen combine to form water as a compound

ANSWERED AT 28/02/2020 - 08:11 AM


QUESTION POSTED AT 28/02/2020 - 08:11 AM

Explain why are hydrogen and oxygen considered wheares water as a compound

Hydrogen and oxygen are different elements ...
but when two or more elements combine... it is known as a compound.. hence hydrogen and oxygen together form a compound

ANSWERED AT 28/02/2020 - 08:10 AM


QUESTION POSTED AT 28/02/2020 - 08:10 AM

How many grams of potassium chlorate decompose to potassium chloride?

You have to find out how many moles of O2 you have at the pressure and temperature. Use PV=nRT then calculate grams from moles of KC103

ANSWERED AT 28/02/2020 - 07:52 AM


QUESTION POSTED AT 28/02/2020 - 07:52 AM

The elements found in Group 2A, from top to bottom, include beryllium, magnesium, calcium, strontium, and barium. Which of these elements has the highest electronegativity value?

Electronegativity is the property of the element to attract electrons to its nucleus. The trend of electronegativity in the periodic table is decreasing from right to left and decreasing from top to bottom. hence from the given elements, the element with the highest electronegativity should be A.beryllium 

ANSWERED AT 28/02/2020 - 06:54 AM


QUESTION POSTED AT 28/02/2020 - 06:54 AM

Why is stainless steel used instead of pure iron for the ball of the pen

Stainless steel is used instead of pure iron in ball of pen mainly because
1. Iron is just a mixture of carbon of and other impurities due to which it in not ductile.
2. Iron is difficult to form any shape as compared to steel.

ANSWERED AT 28/02/2020 - 05:23 AM


QUESTION POSTED AT 28/02/2020 - 05:23 AM

PH is the a measure of the 1) concentration of hydrogen ions in solution 2) concentration of compounds in solution 3) concentration of OH- in solution

The correct answer is:

1) Concentration of hydrogen ions in solution

- I can verify this is correct because I took the test.

ANSWERED AT 28/02/2020 - 04:27 AM


QUESTION POSTED AT 28/02/2020 - 04:27 AM

How to make compound G Can somebody give a detailed explanation?

I'm slightly confused by your question as it tells you that G is produced by reacting E with aqueous bromine, but the structure of G is not shown so I am assuming that you would like to know its structure. In this situation a number of additions could occur, but I believe the most likely is addition of the bromine across the C-C double bond, resulting in a dibromo structure where each bromine atom is bonded to an adjacent carbon.

ANSWERED AT 28/02/2020 - 04:19 AM


QUESTION POSTED AT 28/02/2020 - 04:19 AM

How many moles of nitrogen, N, are in 82.0 g of nitrous oxide, N2O?

Answer : The number of moles of nitrogen present in nitrous oxide are 3.72 moles.

Explanation : Given,

Mass of  = 82.0 g

Molar mass of N_2O = 44 g/mole

First we have to calculate the moles of N_2O.

\text{ Moles of }N_2O=\frac{\text{ Mass of }N_2O}{\text{ Molar mass of }N_2O}=\frac{82.0g}{44g/mole}=1.86moles

Now we have to calculate the moles of nitrogen in nitrous oxide.

In nitrous oxide N_2O, there are 2 moles of nitrogen and 1 mole of oxygen.

As, 1 moles of N_2O contains 2 moles of nitrogen

So, 1.86 moles of N_2O contains 1.86\times 2=3.72moles of nitrogen

Therefore, the number of moles of nitrogen present in nitrous oxide are 3.72 moles.

ANSWERED AT 28/02/2020 - 04:17 AM


QUESTION POSTED AT 28/02/2020 - 04:17 AM