Answer:
D) sodium chloride
i think this is the answer
Explanation:
surely help:) I’ll brainlist!
Answer:
A. The product formed have more energy than the reactants.
This is because it is an endothermic reaction.
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Revision has a atoMic number of 37 and a mass number of 85. HIW many protons, neutrons and electrons does an ion of rubidium with a 1+ charge have
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.
chất có ở đâu ? nước tự nhiên là chất hay hỗn hợp
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.
What is the mass of six of these marbles? What is the volume? What is the
density?
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:
please answer quick...................
Answer:
3). C
Explanation:
When inter-nuclear distance [ atomic radius ] is smaller, the nuclear attraction has a greater magnitude.
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A scientist who wants to study the effects of a new fertilizer on plants would probably
Answer:
1 no is answer give each experiment group the same amount of fertilizer
A _______ is a substance used during electrolysis that splits apart and is attracted to an oppositely charged electrode
Answer:
electrolyte
Explanation:
An atom of sodium-23 (Na-23) has a net charge of
+1. Identify the number of protons, neutrons, and
electrons in the atom. Then, explain how you
determined the number of each type of particle.
Use the
periodic table to help you.
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 :)
write the chemical formula for the following compound -magnesium chloride, zinc sulphide Sodium,sodium sulphate, calcium bicarbonate.
Answer:
magnesium chloride: MgCl2
zinc sulphide: ZnS
sodium sulphate: Na2SO4
calcium bicarbonate: Ca(HCO3)2
what is the volume of a substance with a mass of 64.9 g/ and a density of 2.1 g/ml?
Calculate the no. of moles in 25gm of calcium phosphate
PLz Fast
answer/
1 grams Calcium Phosphate to mol = 0.00322 mol
no. of moles= 0.00322×25
no. of moles = 0.0805
What effect does fermented sugar have in beer brewing
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.
Compare and contrast the three types of mixtures (solutions, colloids, and suspensions).
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
Apakah perbezaan kakilauan permukaan rod kuprum dan karbon
Answer:
soalan ni yang ni tahun atau tingkatan
How can you determine the number of shells in an atom of a certain element, based
on the element's position on the periodic table?
Answer: At some point in your chemistry education, you may have been introduced to the song “The Elements in which Tom Lehrer does a rapid
fire musical rendition of all the elements' names. Like me, you may even have been offered the opportunity to memorize this song for extra credit. If so, it’s possible that you still remember the names of all the elements, which is an impressive feat—not to mention a fun trick to pull out at parties.
Explanation:
In two atoms atom 'X' looses two electrons and atom 'Y' gains two electrons to form a compound 'XY'.Name the bond formed between X and Y.With two properties of the compound.
Please help me and i will mark you as brainleist.
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
.
.
.
Hope it helps
If you were converting from Milli- to Centi- units, how many decimal places would you move?
Answer:
1 decimal place
Explanation:
centi- is 10 times larger than milli- (centi- = 0.01 milli- = 0.001)
1 mili is equal to the 0.01 centi. Since all metric units differ by powers of ten, changing between them just necessitates moving the decimal point to the left or right.
What is difference between millimeter and centimeter ?The actual ratio is 10 millimeters to 1 centimeter. Now, it is clear that centimeters are bigger than millimeters.
There is no change in volume, these measurements are the same. The main distinction is that fluid quantities are measured in milliliters, but solid quantities are measured in cubic centimeters. 1 cc is 1 mL no matter what is being measured.
The units used to measure length are centimeters and millimeters, respectively. 1 cm is equivalent to 10 mm, and 1 millimeter is equal to 0.1 centimeter.
Thus, for converting from Milli- to Centi- units 10 digit place would be move.
To learn more about millimeter and centimeter refer the link below;
https://brainly.com/question/17251149
#SPJ2
underline and identify the parts of the text on this page that use examples of how the flow of the matter through a system is driven by energy and can do the work.
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;
River bank particle erosionElectric power generation2) The flow of electrons that corresponds to the flow of electricity (in the reverse direction) to perform the following works;
Light bulbs turn onTelevisions are powered3) 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
Hammering a metal piece into shape4) The chemical potential energy stored in bonds by virtue of the relative atomic distances which produces kinetic energy from the chemical potential energy
Lear more about energy conversion here:
https://brainly.com/question/15105485
Sorry for the spamming, but this question is URGENT here,
Which of the following is
property of metals?
A. brittle
B. good conductivity."
C. poor conductivity
(Btw here’s a picture :O)
Option B, Metals have good conductivity.
Hope it helps you.. pls mark brainliest if it helps you
state two application of chemistry on each of the following:-
1.forensic
2.agriculture
3.industrial
4.millitary
5.space science
The atomic number of the element with the maximum number of unpaired 2p electrons in the ground state is
1) 1 2) 7 3) 13 4) 8
EASY 30 POINTS! PLS HELP ME T-T
1. True or false? All atoms in an element contain an identical number of neutrons.
2. An atom with a _______ charge has the same number of protons and electrons.
3. An atom that has a different number of electrons and protons is called a(n) _______.
Answer:
1.false
2.neutron
3.neutron
Answer:
1. false
2. zero
3. isotopes
hope it helps
Please help me with this chemistry
Answer:
platinum is the correct answer
Answer:
it would be made of platinum
Explanation:
SURELY SOMEONE HELP it’s urgent plllss I’ll brainlist u/5 star!!! answer the ones u know. :)
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
Help anyone can help me do this question,I will mark brainlest.
Explanation:
NA2SO3
Combination of these three elements forms following compounds.
And the compound that's going to be formed,depends on the ratio of available oxygen and sulphur.
Depends on the ratio of sulfur to oxygen...
sodium sulfate, Na2SO4
sodium sulfite, Na2SO3
sodium thiosulfate, Na2S2O3
ionic bond is present in between SO3 -2 and Na+2
structure of SO3 -2 [take - sign as delta - which here indicates,partial formal charge of oxygen] (image below)
Here,The oxygen is more electronegative.So,2 oxygen atoms drag one Electron from sulphur atom,leaving behind the formal charge of -1 on two oxygen atoms.
The third oxygen forms covalent bond by sharing 2 electrons. (Actually this ion has resonance structure)
This sulphite ion combines with two sodium ions to form two ionic bonds.This happens when sodium, being an alkali metal dontes it's valence electron to oxygen.
SO2
In Sulphur dioxide, Sulphur is bonded to 2 oxygen atoms. Oxygen is more electronegative than Sulphur and thus, shows a fixed valency of 2. As a result each oxygen forms two bonds with the Sulphur atom making its valency 4.
NAHSO4
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Questions & Answers
CBSE
Chemistry
Grade 11
Oxidation State or Oxidation Number
Question
Answers
Related Questions
The oxidation state of sulphur in NaHSO4 ?
A) 0
B) + 2
C) −2
D) + 4
E) + 6
Answer
VerifiedVerified
72.9K+ Views
Hint: The oxidation state is defined as the charge on the atom. The sum of the oxidation state of an atom in a molecule is equal to the charge on the molecule. The neutral molecules charge less species. It has zero charges.
Complete Solution :
- The oxidation number of an atom is defined as the charge on an atom that appears on the atom on forming an ionic bond. An atom which has higher electronegativity has a negative oxidation state and more electropositive elements have positive oxidation state.
- We are interested in determining the oxidation state of an atom in a molecule. We know that the net charge on a neutral atom or molecule is always equal to zero. Let’s determine the oxidation state of S in the NaHSO4 .
- The oxidation number of alkali metal that is a sodium atom is equal to +1 . Similarly the hydrogen has an +1 oxidation state. Oxygen is an electronegative element. It has an −2 oxidation state. The oxidation states are as listed below:
Element Oxidation state
Na +1
H +1
O −2
We know that the sum of the oxidation state of an atom in a neutral molecule is equal to zero. Then we have,
0 = O.S. of Na + O.S. of H + O.S. of S + 4(O.S. of O)
Let’s substitute the values of oxidation state .we have,
0 = 1 + 1 + O.S. of S + 4(−2)⇒O.S. of S= 8−2 = +6
Therefore the oxidation state of sulphur in NaHSO4 is equal to +6 . So, the correct answer is “Option E”.
H2S
Valency of sulphur is 2 in H2S
Should I take chemistry in high-school? Is it easy or hard?
Answer:
Yes, If you understand it's easy
Explanation:
Although, chemistry is a fun subject which includes learning about chemical and experiments.
"If you like my answer mark as brainlist" ☺️.
Answer:
may be
Explanation:
if u want to study chemistry.then here are some advantages.Chemistry teaches useful skills. Because it is a science, learning chemistry means learning how to be objective and how to reason and solve problems. Helps you to understand current events, including news about petroleum, product recalls, pollution, the environment and technological advances.
what is the concentration of hydrogen ion, H+, present in a water sample if 100. ml of the sample requires 7.2 ml of 2.5 x 10 -3 M NaOH to be neutralized
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)
What is the control in the experiment?
Answer:
C. the amount of drug x given to mice
Find the density of mercury if 205 mL has a mass of 2790 g; round
your answer to the nearest 0.1 g/mL.
Answer:
D= m/ V
D = density of mercury , m= mass , V= Volume
D = 2790 / 205
D = 13.6 g/ml
D = 1.36 ×10-¹ g/ml
I hope I helped you^_^
Which of these are PHYSICAL changes?
А.
cutting, tearing, freezing, thawing, folding.
mixing without chemical changes
B.
burning, rusting, forming a new substance from
two different substances, exploding, cooking
Answer:
the answer to this problem is a
