the atomic number of calcium is 20 . the maximum possible numbers of electron in m-shell is a 2 b 8 c 18 d 10​

Answer:

81 °C

Explanation:

This is a calorimetry question so a few things you will need for this. The calorimetry equation q=mcΔT & the specific heat of water (4.2J/g•°C). Other definitions are:

q = heat added/released by a sample

m = mass of sample

c=specific heat of sample

ΔT = change in temperature

from here we can rearrange the equation to state:

q/(mc) = ΔT

1200J/((20.0g)(4.2J/g•°C)) = ΔT

14°C = ΔT

If the starting temperature was 95.0°C and we know that the temperature was cooled by 14°C then the final temperature of the water would be 81.

Answer:

C. 81 c

Explanation:

took the test :)

Answer:

If the sugar concentration level of the must becomes too high at any given point--either at the beginning or during the fermentation--it starts to have an inhibiting effect on the yeast's ability to produce alcohol. In other words, the higher sugar concentration starts to act as a preservative effecting the fermentation in a negative way.

Explanation:

Fermentation is the process by which yeast converts the glucose in the wort to ethyl alcohol and carbon dioxide gas -- giving the beer both its alcohol content and its carbonation.

Answer:

Hi, There! :)

If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element.

Answer:

If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element. All known elements are arranged on a chart called the Periodic Table of Elements.

Explanation:

that's what I found buddy

Answer:

A. The product formed have more energy than the reactants.

This is because it is an endothermic reaction.

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Answer:

Chemical change

Explanation:

Because a new substance is formed.

Answer:  1.8x10^-4 M H+

Explanation:  The number of moles of NaOH added to the 100 ml soultion will be equal to the number of moles of H+ present in that solution.  

Moles NaOH in 7.2 ml of 2.5x10^-3 M NaOH

(2.5x10^-3 M NaOH) is the same as 2.5x10^-3 moles NaOH/liter

(2.5x10^-3 moles NaOH/liter)*(7.2 ml)*(1 liter/1000ml) = 1.8x10^-4 moles NaOH used to titrate 100 ml of the acid.  That means there was 1.8x10^-4 moles of H^+ in 100 ml.  

Concentration of H^+ = (1.8x10^-4 moles H)/0.100 l) = 1.8x10^-4 M H+

(pH of 3.74)

Answer:

Freezing water and cracking limestone are physical changes.

Answer:

C

Explanation:

alkali metals are the Group I elements, which have 1 electron in their valence shells

Answer:

Alkali metals are the elements which have only one valence electron in their outermost or ultimate shell.

Explanation:

Alkaline Earth metals have 2 valence electron in their outermost shell and readily give up their 2 electron to achieve stability.

Rare Earth Metals have 3 valence electron in their outermost shell and they have high magnetic moments and divert range of magnetic structure.

Alkali Earth metals have 1 valence electron.

Transition metals generally have 2 valence electron .

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Answer:

3 exothermic reaction. only that much

Hi,

These are the answers.

• Question 2. C , Substance dissolves

• Question 3. D , Exothermic reaction

• Question 4. C , Endothermic reaction takes place

• Question 5. A , the products formed has more energy than reactants

Hope it helps you... pls mark brainliest if it helped you

Answer:

2 ka A. nitrogen, oxygen, Carbon dioxide

Answer:

no 1 Ans gas

hope it works

Option B, Metals have good conductivity.

Hope it helps you.. pls mark brainliest if it helps you

The parts of the text on the page that use examples of how the flow of matter through a system is energy driven and has the capacity to do work are;

1) The flow of water down rivers passing through hydro power dams to perform the following works;

2) The flow of electrons that corresponds to the flow of electricity (in the reverse direction) to perform the following works;

3) The lifting of the hammer by the cam which gains gravitational potential energy that is converted to kinetic energy as the hammer drops

The hammer is repeatedly lifted and dropped by the cam to do the following work

4) The chemical potential energy stored in bonds by virtue of the relative atomic distances which produces kinetic energy from the chemical potential energy

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Answer:

ans:Ne=2,8,1

ans:2,8,7

Answer:

the answer to this problem is a

Answer:

» Reactivity and color

Explanation:

though color is very minor answer because it also relates to a physical property.

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Answer:

Protons= 11

neutrons= 12

electrons = 10

Explanantion:

Look for Na on periodic table

Atomic Number = 11

Atomic Mass = 23 (round it to be an integer)

Number of protons = Atomic number = 11

Number of neutrons = Atomic mass - atomic number = 23-11 =12

Number of electrons = 11 - e = ´+1 , electrons = 10

Answer:

Protons= 11

neutrons= 12

electrons = 10

Explanation:

That should be the answer :)

Answer:

1.false

2.neutron

3.neutron

Answer:

1. false

2. zero

3. isotopes

hope it helps

Answer:

All right. So let's calculate the density of a glass marble. Remember that the formula for density is mass over volume. So if I know that the masses 18.5 g. And I know that the um volume is 6.45 cubic centimeters. I can go ahead and answer this to three significant figures. So it's going to be 2.87 grams per cubic centimeter. Okay, that's our density. Now, density is an intensive process. Okay. We're an intensive property. I really should say. It doesn't depend on how much you have. Mhm. If I have one marble, its density is going to be 2.87 g per cubic centimeter. If I have two marbles, the density will be the same because I'll double the mass and I'll also double the volume. So when I divide them I'll get the same number. Okay, that's what makes it an intensive property. No matter how many marbles I have, they'll have the same density. Mass though is not an intensive property. So if I have six marbles and I want to know what the massive six marbles is. Well, I know the mass of each marble is 18.5 g. So the mass of six marbles Is going to be 100 11 g. Because mass is an extensive property. It depends on how much you have. If I change the number of marbles, I'm going to change the mass. That's an extensive property. All right. So we've calculated the density. We've calculated the mass and then what happens to the density of one marble compared to six marbles as we mentioned before. Since densities and intensive property, the densities will be the same, no matter how may.

Explanation:

Answer:

C. the amount of drug x given to mice

answer/

1 grams Calcium Phosphate to mol = 0.00322 mol

no. of moles= 0.00322×25

no. of moles = 0.0805

Answer:

the acceleration that it gives to freely falling objects.

Explanation:

i took quiz

Answer: 37 protons, 48 neutrons, and 36 electrons.

Explanation: I assume "Revision" is Rubidium. It is atomic number 37, so it has 37 protons. It's atomic mass is 85, so it has an average of (85-37) = 48 neutrons. It has a charge of +1, so one electron of the original 37 has left.

Answer:

Water, H2O, is a pure substance, a compound made of hydrogen and oxygen. Although water is the most abundant substance on earth, it is rarely found naturally in its pure form. Most of the time, pure water has to be created. Pure water is called distilled water or deionized water.

Answer:

The bond formed between XY is "Ionic bond"

Explanation:

The bond is ionic bond because the compound XY is formed due to the gaining and loosing of electrons

Properties of Ionic compounds:

They form crystals

They are good insulators

They have high melting and boiling points

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Hope it helps

Answer:

solutions is a homogenous mixture while colloids and suspensions are heterogeneous mixtures made up of 3 or more substances

Explanation:

homogeneous- made up of one thing

heterogeneous- made up of 2 or more things

The correct answer to the question is Rubidium (Rb)

Rubidium (Rb) is a group 1 element and as such, it can form bond by losing it's valence electron (i.e 1 electron) easily.

Gallium (Ga) is a group 13 element. It can only form bond by losing it's 3 valence electrons.

Argon is a group 18 element. This group has completely filled outermost shell and are very stable. They do not involve in bond formation.

Iodine (I) is a group 17 element. It is more difficult for this group to lose its 7 valence electrons hence, they form bond by accepting 1 electron.

With the above information, we can conclude that Rubidium will most likely lose electron to form bond.

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Answer:

(Question 1)Which element would most likely lose electrons to form positive ions when bonding with other elements?

(Answer) rubidium (Rb)

(Question 2) Which statement about sodium chloride is correct?

(Answer) The sodium atom transfers electrons to the chlorine atoms to form ionic bonds.

(Question 3) Based on their locations in the periodic table, which two elements are most likely to form covalent bonds with each other?

(Answer) nitrogen (N) and oxygen (O)

(Question 4) Which phrase best describes electronegativity?

(Answer) the relative strength with which an element attracts electrons in a chemical bond

(Question 5) Based on the information in the table, which pair of elements would likely form the least polar bonds with each other?

(Answer) bromine and nitrogen

Explanation:

just finished the quick check enjoy UwU

Answer:

Thanks!!!

Explanation:

Answer:

true

Explanation:

Answer:

3). C

Explanation:

When inter-nuclear distance [ atomic radius ] is smaller, the nuclear attraction has a greater magnitude.

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[tex] \huge \boxed{\mathfrak{Formulas} \downarrow}[/tex]

[tex] \large \sf \: mole = \frac{mass}{molar \: mass} \\ [/tex]

[tex]\large \sf \:mole = \frac{volume}{molar \: volume} \\ [/tex]

[tex]\large \sf \:concentration \: ( \frac{g}{ {dm}^{3} } ) \\\large \sf \: = \frac{mass(g)}{volume( {dm}^{3} )} [/tex]