There are 1.16x10²² sulfide ions (S²⁻) in 15 dg of sodium sulfide (Na₂S).
The equation for sodium sulfide is the following:
Na₂S → 2Na⁺ + S²⁻ (1)
So from equation (1), we can see that in 1 mol of sodium sulfide we have 1 mol of sulfide ions and 2 moles of sodium ions.
First, let's find the number of moles of Na₂S
[tex] n_{Na_{2}S} = \frac{m_{Na_{2}S}}{M_{Na_{2}S}} [/tex] (2)
Where:
[tex]m_{Na_{2}S}[/tex]: is the mass of Na₂S = 15 dg = 1.5 g
[tex]M_{Na_{2}S}[/tex]: is the molar mass of Na₂S = 78.0452 g/mol
The number of moles of Na₂S is (eq 2):
[tex] n_{Na_{2}S} = \frac{1.5 g}{78.0452 g/mol} = 0.0192 \:mol [/tex]
We can find the number of ions of S²⁻ with Avogadro's number, knowing that the number of moles of Na₂S is equal to the number of moles of S²⁻ (eq 1).
[tex] ions_{S^{2-}} = \frac{6.022 \cdot 10^{23} \:ions}{1\:mol}*0.0192 \:mol = 1.16 \cdot 10^{22} \:ions [/tex]
Therefore, there are 1.16x10²² sulfide ions in 15 dg of sodium sulfide.
Find more about Avogadro's number here:
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I hope it helps you!
Gravity relates to a stream's ability to erode and deposit material by causing water to flow faster down a steep slope. True or False
Answer:
true
Explanation:
ANSWER ASAP
PLeAsE
?????????????
Answer:
The answer is A.) leaving a copper penny in vinegar until it turns green.
All the other options are physical changes, as you can separate the two mixtures.
I hope this helps you! :)
The nucleus of most atoms is composed of which of the following sub-atomic particles?
A. tightly packed protons.
B. tightly packed neutrons.
C. tightly packed protons and neutrons.
D. loosely connected protons and electrons.
Answer:
C. Tightly packed protons and neutrons
Explanation:
It consists of two sub-atomic particle namely proton and neutron.
This dense nucleus is responsible for most of the mass of atom.
Answer:
C. tightly packed protons and neutrons
Explanation:
The nucleus of an atom is made of protons and neutrons with electrons orbiting the nucleus.
how does decreasing the temperature affect the volume of gas??
Answer: Well, when you decrease the temperature in a gas the volume will decrease as well as the pressure. Since, heating a gas or liquid increases the temperature/pressure. Therefore, it'd increase the volume but since the temperature is decreasing the volume of the gas does too.
2. In what state are particles spread farthest apart?
A)solid
B)liquid
C)gas
3. How does thermal energy explain your answer to #2?
Answer:
In what state are particles spread farthest apart? Answer= Gas
How does thermal energy explain your answer to #2?
When something is hot and/or warm its moving fast like the steam u see on a cup of tea , it travels faster than any other state of matter.
Explanation:
hope i helped
which compound would have the lowest melting point?
Which of the following are directly proportional? *
volume and temperature
pressure and volume
pressure and temperature
Nguyên tử nguyên tố sắt có 26e
a. Viết cấu hình e của sắt
b. Sắt thuộc nguyên tố s,p,d,f
Answer:
1s2 2s2 2p6 3s2 3p6 3d6 4s2
Explanation:
Can you answer my question in SCIENCE... Directions: Below are the reactants and products of photosynthesis. Choose the chemical symbol that matches the word.
Answer:
Water :H2O
Carbon dioxide :CO2
Oxygen :O2
Glocuse :C6H12O6
Answer:
water = H20
carbon dioxide = CO2
oxygen = 02
glucose= C6H1206
Explanation:
How much effort force would you use to lift a 300 kg weight with a fixed pulley system?
Answer:
It would take 150 kg to lift the load
Explanation:
A compound formed from a metal and a non-metal will have which type of bond?
A. Covalent
B. Hydrogen
C. Ionic
D. Atomic
it's an ionic bond
btw i love your profile picture never understand is one of my favorites
Which of the following is the best explanation for the fact that crushing increases the rate at which a solid dissolves in a liquid?
Select one:
a. The temperature of the solution is increased when the solid is crushed.
b. The surface area of the solute is increased when it is crushed.
c. Crushing increases the amount of solute present.
d. Crushing makes stirring the solution easier.
between a water molecule and an ethanol molecule, a hydrogen bond can occur between a lone pair of electrons on the _____a_____ in water and the _____b_____ of an ethanol molecule.
Answer:
They will form a hydrogen bond with the oxygen atom and the polar hydrogen atom.
Between a water molecule and an ethanol molecule, a hydrogen bond can occur between a lone pair of electrons on the Oxygen and a Hydrogen in water and the Polar hydrogen of an ethanol molecule.
What is Hydrogen bond ?Hydrogen bonding is an interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons.
It is a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces.
In the given question, They will form a hydrogen bond with the oxygen atom and the polar hydrogen atom.
Learn more about hydrogen bond here ;
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Atomic Number
Atomic Mass Number
Protons
Neutrons
Electrons
Charge
Element 1
6
12
A
6
6
B
Element 2
6
13
6
C
D
1+
Look at the above table.
What charge (B) should Element 1 have
Question 2 options:
0
6
12
1+
Answer:
B for element 1 0 charge
Explanation:
Atomic Number
Atomic Mass Number
Protons
Neutrons
Electrons
Charge
Element 1
6
12
A
6
6
B
Element 2
6
13
6
C
D
1+
Look at the above table.
What charge (B) should Element 1 have
Question 2 options:
0
6
12
1+
from the data we can construct the following table
element 1 element 2
Atomic # 6 6
Atomic mass 12 13
protons 6 6
neutrons 6 7
electrons 6 5
charge 0 +1
the atomic # of both is 6, so they are both carbon with 6 protons
element 1 has a total of protons plus neutrons of 12, element 2 of 13
so element 1 has 6 neutrons,element 2 has 7
element 2 has a +1 charge with 6 protons, so it has only 5 negative electrons
element 1 with 6 protons has 6 electrons, so it has a 0 charge
How many atoms are in 3 C2H6
Select the atoms that are lithium with a mass of 7
Answer:
I dont know
Explanation:
I just dont know
which of the following atoms is most likely to bond with another atom?
Answer:
c. chlorine, with an outer electron shell filled with 7 of a possible 8 electrons
Explanation:
Hope this helps!
The structure in the option A has 7 electrons in the outer shell of its electronic configuration , is unstable and so is most likely to form bond with another atom.
What is electronic configuration ?Electrons are arranged in various shells around the nucleus , this arrangement is called electronic structure or configuration.
Each shell can occupy certain fixed number of electrons.
Beside Option A , all the other configurations show stable structures as the last shell has eight electrons and are stable according to the octet rule.
The structure in the option A has 7 electrons in the shell and so is most likely to form bond with another atom.
To know more about Electronic Configuration
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Which of these statements is false?
A. Electrons have a negative charge
B. Electrons have a mass of 1 amu
C. The nucleus of an atom is positively charged
D. The neutron is found in the nucleus of an atom
Answer:
The answer is b
Explanation:
Hope it helps
b) electrons have a mass of 1 amu
electrons have a mass of 0 amu
WHAT IS THE MIXTURE OF BOILING POINT AND MELTING POINT?
(ive been stuck on that question for AGES)
Answer:
A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.
Answer:
What is it has fixed boiling point substance or mixture? A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.
Explanation:
lol they got it from go ogle
Plants are able to produce special chemicals at the right time and place.
A: True
B: False
help fast my test is almost due
Answer:
true
Explanation:
An example of a cell is a ____________ cell.
Answer:
Prokaryotic / Eukaryotic
why is stability of compounds essential
Answer:
chemical stability is important to consider in the comprehensive assessment of pharmaceutical properties, activity, and selectivity during drug discovery.
Answer:
In general, molecules are stable because all their constituent atoms have sufficient "valence" electrons-that is, electrons that participate in chemical bonding. Such electrons reside in the outer, or valence, "shell," which must fill up with the appropriate number of electrons for the bound atoms to be come stable.
Explanation:
true or False
sound needs a medium to travel
Answer:
True or T
Explanation:
Is the correct answer please make me brainliest
which type is every one in this picture: pure substance or mixture?
Answer:
1,2,3,4,8,9,10,12,14,15 and 16
Explanation:
Coz they have different kinds (colours) of atoms
The rest are pure substances,
I'm not so sure though, double check after this
Oxygen cannot be broken
down into a different
substance. What can we call
oxygen?
Answer:
• Oxygen is an element
Answer:
We can call it an element.
1. Ethanol has a density of 0.800 g/mL.
What is the mass of 225 mL of ethanol?
Since the ethanol has a density of 0.800 g/mL, the mass of the ethanol is 180 grams.
Given the following data:
Volume of ethanol = 225 mL
Density of lead ball = 0.800 g/mL.
To find the mass of the ethanol;
Density can be defined as mass all over the volume of an object.
Mathematically, the density of a substance is given by the formula;
Density = Mass/Volume
Making mass the subject of formula, we have;
Mass = Density x Volume
Substituting the given parameters into the formula, we have;
Mass of ethanol = 180 grams.
If you were to mass the reactants before a reaction and then mass the products after the reaction what would you expect to find and why?
pls answer fast ill give brainliest!
Answer:
No change...
Explanation:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
Mark as Brainliest please...
What volume (in L) of 1.10 M FeCl₃ would be required to obtain 0.700 moles of Cl⁻ ions?
0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.
Thus, Volume (L)= moles/ concentration. 0.700 moles of Cl⁻ ions and the concentration of the FeCl₃ solution is 1.10 M, you can plug in these values to calculate the volume.
Volume (L) = 0.700/ 1.10 M,
Volume (L)= 1.10M/ 0.700moles
Volume (L) = 0.700/ 1.10 ≈ 0.636 L
Therefore, approximately 0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.
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An atom will be neutral ONLY if
Answer:
They have the same number of charged protons and electrons, therefore balancing positive and negative charges. I hope this helps you.
Explanation:
What is the molecular mass of Br 2?
Answer:
159.808 g/mol
Answer:
159.80 g/mol
Explanation:
79.90×2=159.80g/mol
