d- Helium in air me air is made up of various gases
a bronsted lowry acid is defined as a substance that
Answer:
that donate H+ ion.
Explanation:
hope this helps :)
how many sulfide ions are in 15 dg of sodium sulfide?
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!
why the core is metallic and the lower mantle is not.
Answer:
due to the overlaying layers of strata (layers of earth) an high pressure is created at the core. due to this it behaves like an solid rether than being a liquid... the lower mantle is not solid because in this case the overlaying strata doesn't produce that much pressure on it..
Explanation:
brainliest plz
Which statement describes the bonds in iron sulfate, FeSO4?
Fe and S have an ionic bond, while S and O have covalent bonds.
Fe and S have a covalent bond, and S and O have covalent bonds, too.
Fe and S have a covalent bond, while S and O have ionic bonds.
Fe and S have an ionic bond, and S and O have ionic bonds, too.
___
Regarding the bonds in FesO₄, Fe and S have an ionic bond, while S and O have covalent bonds.
Elements form bonds to increase their stability. The main types of bonds are:
Metallic bonds: they are formed between metals and the electrons are in a delocalized cloud.Ionic bonds: they are formed between metals (lose electrons) and nonmetals (gain electrons)Covalent bonds: they are formed between nonmetals, which share electrons.Regarding the bonds in FesO₄:
Fe is a metal and S a nonmetal, thus they will form ionic bonds.S and O are both nonmetals, thus they will form covalent bonds.Regarding the bonds in FesO₄, Fe and S have an ionic bond, while S and O have covalent bonds.
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a sheet of pure aluminum loses heat. what will happen to the aluminum atoms
Answer:
they will slow down i think
Explanation:
losing heat means it cools down so atoms are slower
Please help me with chem, it would be very appreciated!
why it is necessary to draw a Lewis diagram before predicting the shape of a molecule
To determine the shapes of molecules, we must become acquainted with the Lewis electron dot structure. Although the Lewis theory does not determine the shapes of molecules, it is the first step in predicting shapes of molecules. The Lewis structure helps us identify the bond pairs and the lone pairs.
Please mark BRAINLIEST.
Describe what does happen to the electrons when metal atoms are bonded together.
Answer: In metallic bonds, the valence electrons from the s and p orbitals of the interacting metal atoms delocalize. That is to say, instead of orbiting their respective metal atoms, they form a “sea” of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions. Metals are shiny.
Explanation: Hope this helped!
what happens when chocolate get heated?
hope it helps
What is the formula for Water?
Name full name element's name
Answer:
2 Hydrogen atoms and 1 Oxygen atoms makes water
Explanation:
Hope this helps^^
Answer: Its chemical formula H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms,
Explanation: i hopes it helps :)
Which scientist is credited with developing the fist scientific atomic theory
Answer:
German chemist G.E. Stahl
aluminum has a density of 2.70 g/cm^3, a sample with a volume of 50 cm^3 will have how much mass?
Answer:
135 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question
density = 2.70 g/cm³
volume = 50 cm³
We have
mass = 2.70 × 50 = 135
We have the final answer as
135 gHope this helps you
write the formulas of alkanes that contain three, five, seven, and nine carbon atoms
Answer:
Explanation:
Name Number of Carbon Atoms Molecular Formula
methane 1 CH4
ethane 2 C2H6
propane 3 C3H8
butane 4 C4H10
as a bystander, the _______ approach doesn’t work when drugs or alcohol are involved, as the person you’re trying to stop is more likely to become defensive or hostile.
When trying to step into an argument or misunderstanding between people as a bystander with drugs and alcohol involved, the direct approach won't work.
When trying to make peace between quarelling individuals as a bystander, the direct approach would fail if alcohol or drugs is being held as the prsin might see you as a villian. Only when the person knows and trusts you will this approach work. Hence, when drugs or alcohol is involved, other methods of rendering help should be employed.Therefore, the direct approach won't work in the this scenario.
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which reagents are appropriate to carry out the conversion shown?
A reagent us a chemical substance applied in a chemical reaction to bring about a change in the chemical reaction process. The reagent that is appropriate to carry out the conversion is Ethanol (CH3CH2OH).
Organic Reactions are reactions taking place in organic compounds and they can take various forms such as electrophilic addition reaction or nucleophilic substitution reactions.
From the assumed diagram below, the reaction takes place in an unimolecular nucleophilic reaction SN1 mechanism in which a racemic mixture produce an organic compound and an enantiomer.
For the reaction to take place, the best organic reagent to us is known as ethanol (CH3CH2OH). This is because the organic reagent is a solvent that acts as a Nucleophile.
In the reaction, bromine (Br) is the leaving group, after it detaches from the racemic compound, it forms a carbonation in which the Ethanol CH3CH2OH attacks at the carbonation site.
Therefore, we can conclude that the Reagent necessary to carry out the conversion is Ethanol (CH3CH2OH)
Learn more about organic reagent here:
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If you increase the force on an object, its acceleration increases. True or false
Answer:
true
Explanation:
from Newton's second law of motion ,we can understand that acceleration of a body is directly proportional to the force applied on it and inversely proportional to its mass ,so as the force applied increase,the acceleration also increases
______Is analyzed by qualitative methods
A. The identify of the poison used in a murder.
B. The amount of poison used in a murder.
C. The location of the poison used in a murder.
D. The method used by the suspect to kill the person.
Answer:
A. The identify of the poison used in a murder.
Explanation:
What is the name of this alkene?
Answer:the name is cc bc it 4920 and hehe i just want points thank you
Explanation: lol did wsiw skwks thanks for points
The atomic number of an element:
#1. Tells you the mass of the atom
#2. Tells you the number of energy levels there are around the atom
#3. Tells you the identity of the atom
#4. Tells you how many valence electrons the atom has
Answer:
I think #3 might be the answer .
Because in #1 atomic mass tells mass .
#4 Atomic number doesnot only tell about the electrons atom has
how many different products are formed from the dehydrohalogenation of 2-bromobutane?
Answer:
3 1-butene, Z-2-butene, and E-2-butene.
Explanation:
Since 2-butene exists as two stereoisomers, three products are possible from the reaction of potassium ethoxide with 2-bromobutane. The products are, of course, 1-butene, Z-2-butene, and E-2-butene.