Bromine, a liquid at room temperature has a boiling point of 58 degrees celsius and a melting point at -7.2 degree celsius bromine can be classified as a

Answers

Answer 1

Answer:

Hello!

Bromine can be classified as a pure substance.

Why?

Bromine is an element with atomic number 35 on group 17 of the Periodic Table. That's the first sign that shows us that it is a pure substance.

But the fact that it has a clear and defined boiling and melting point is a sign that we are in the presence of a pure substance. Pure substances are characterized by defined boiling and melting points.

Mixtures usually have a range of temperatures in which they melt and boil.

Have a nice day!

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What orbits the nucleus of an atom?

Answers

Electrons orbit the nucleus of an atom. They are very small, in fact they are 1/2000 of an amu. Electrons are negative while the inside of an atom includes the positive protons and neutral neutrons. :D

Electrons. They are found in the orbitals outside the nucleus.

Which form of coal is used in explosives

Answers

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What volume of a 0.40 M Mg(NO3)2 solution contains 89g of Mg(NO3)2?

Answers

The volume of a 0.40 M Mg(NO3)2 solution contains 89g of Mg(NO3)2 is 1.5 L.

What is solution?

Solution is defined as a particular kind of homogenous combination made up of two or more different ingredients. Solute refers to the material that dissolves. Solvents are described as substances that do not dissolve. The substance known as salt water is a solution. A solute and a solvent combine to produce a solution; this is a physical, not a chemical process. A solution is produced when one substance splits apart or dissolves into another.

To calculate this, subtract 89g from 148.3g/mol, the molar mass of magnesium nitrate.

= 89 / 148.3

= 0.6 mole of magnesium nitrate

The volume of solution can be as

= 0.6 moles / 0.40 M

= 1.5 liter.

Thus, the volume of a 0.40 M Mg(NO3)2 solution contains 89g of Mg(NO3)2 is 1.5 L.

To learn more about solution, refer to the link below:

brainly.com/question/7932885

#SPJ2

First you need to find the number of moles there are in 89g of Mg(NO₃)₂ . To do this, divide the 89g by the molar mass of magnesium nitrate (148.3g/mol) to get 0.6mol of magnesium nitrate. Then to find the volume of solution that contains 0.6 moles you need to divide 0.6mol by 0.40M to get 1.5L of solution.

I hope this helps. Let me know in the comments if anything is unclear.

Maggie is solving a chemistry riddle her clue is to take the number of valence electrons in halogens and subtract it by the number of valence electrons in alkali metals. what is the answer to the riddle maggie is solving?

Answers

The answer to the riddle Maggie is solving is 6

To determine the answer to the riddle Maggie is solving,

We will subtract the number of valence electrons in halogens by the number of valence electrons in alkali metals.

First, let us define what is meant by valence electrons

Valence electrons are those electrons that reside in the outermost shell surrounding an atomic nucleus.

Now, we will the determine the respective number of valence electrons in halogens as well as the number of valence electrons in alkali metals.

For Halogens

Halogens are the group 17 (group 7A) elements in the periodic table. Examples are Fluorine, Chlorine, Bromine etc.

Halogens have 7 electrons in their outermost shell

For Alkali metals

Alkali metals are the group 1 metals. Examples are Lithium, Sodium, Potassium etc.

Alkali metals have 1 electron in their outermost shell

Now, for the answer to the riddle,

Answer to the riddle = Number of valence electrons in halogens - Number of valence electrons in Alkali metals

Answer to the riddle = 7 - 1

∴ Answer to the riddle = 6

Hence, the answer to the riddle Maggie is solving is 6

Learn more here: brainly.com/question/9392364

What is the molecular formula of caffeine, given that it has an empirical formula of C_4H_5N_2O and a molar mass of 194 g/mol?

Answers

Answer:

$Empirical formula : C4 H 5 N2O \n Empirical \: molar \: mass \: of \: the \n compound \: obtain : \n 12×4+5+2×14+16=97 \n \n Given \: the \: molar \: mass \: of \n Caffeine = 194.2 \n \n n= 194.2 /97=2 \n Thus \: Formula \: of \: \n Caffeine = (C 4H5 N 2 O)2$

Which form of bonding holds cesium chloride (CsCl) together?a. hydrogen bonding
b. covalent bonding
c. metallic bonding
d. ionic bonding

Answers

The correct answer is D. Cesium chloride is held together by ionic bonding. This substance is a salt like sodium chloride. It is also soluble in water. When it dissociates, it forms into cesium ions and chloride ions.

Answer:

The correct answer is D.

Explanation:

Cesium chloride is held together by ionic bonding. This substance is a salt like sodium chloride. It is also soluble in water. When it dissociates, it forms into cesium ions and chloride ions.

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