Si un átomo tiene 18 electrones, cuántos protones tiene?
Answer:
huhhhhhhhhj
hshshhshshshshshsh
Calculate the change in enthalpy for the following reaction:
4 HCl (g) + O2 (g) → 2 H20 (g) + 2 Cl2 (g)
I will mark brainliest.
(I don't need an explanation. I just want to double check my worksheet answers.)
Answer:13hct
Explanation:
A 623 ml sample of gas at STP is allowed to expand (like the universe) until it
occupies a volume of 1200 ml, What temperature would be needed to return the
gas to standard pressure? (all trying to find some equilibrium)
P
T
V
Initial latm
623
Final
loton
Effect
고
212
Yoo
&
a. What variables are constant? (NOT CHANGING!)
A total solar eclipse occurs because the moon can totally block the sun. If the moon was smaller or farther from earth, a total eclipse
Could occur
Could not occur
Answer:
both
Explanation:
id say that it could occur but also not as much. the moon would be smaller and further from the earth to where we would barely be able to see it. if the full moon is barely visible then im sure the total solar eclipse wouldn't be as noticeable as it is now. but thats just my opinion
Using the provided table and the equation below, determine the heat of formation (in kJ/mol) for CuBr₂.
CuCl₂ (s) + Br₂(l) → CuBr₂ (s) + Cl₂ (g) ∆H° = 64.1 kJ/mol
CuCl2= -205.9 kJ/mol
Br2= 0 kJ/mol
Cl2= 0 kJ/mol
The heat of formation of CuBr₂ (s) = -141.8 kJ/mol
The heat of reaction ΔH = ∑ΔHproducts - ∑ΔHreactants
ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]
where ΔHCuBr₂ (s) = heat of formation of CuBr₂ (s), ΔHCl₂ (g) = heat of formation of Cl₂ (g) = 0 kJ/mol, ΔHCuCl₂ (s) = heat of formation of CuCl₂ (s) = -205.9 kJ/mol, ΔHBr₂(l) = heat of formation of Br₂(l) = 0 kJ/mol and ΔH = heat of reaction = 64.1 kJ/mol
Substituting the values of the variables into the equation, we have
ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]
64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol - [-205.9 kJ/mol + 0 kJ/mol]
64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol + 205.9 kJ/mol - 0 kJ/mol
64.1 kJ/mol = ΔHCuBr₂ (s) + 205.9 kJ/mol
ΔHCuBr₂ (s) = 64.1 kJ/mol - 205.9 kJ/mol
ΔHCuBr₂ (s) = -141.8 kJ/mol
So, the heat of formation of CuBr₂ (s) = -141.8 kJ/mol
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Select reason(s) why 1-hydroxy-2-methyl-5-isopropylbenzene is an incorrect systematic name for carvacrol.
a. If named with benzene as the parent, the methyl group needs to have the first locant in order to minimize the number of the third locant.
b. The substituents are not listed alphabetically.
c. If named with benzene as the parent, the hydroxyl group needs to have the first locant in order to minimize the number of the third locant.
d. The substituents are not listed in order of increasing mass.
The reason why 1-hydroxy-2-methyl-5-isopropylbenzene is not the correct systematic name for carvacrol is because the substituents are not listed alphabetically.
IUPAC nomenclature provides the correct and acceptable system of naming organic compounds which are internationally acceptable among scientists.
According to the rules of IUPAC nomenclature, compounds are named in alphabetical order. The names of the locants are ordered in such a way that they have the lowest number. Following IUPAC nomenclature, the correct name of the compound ought to be, 1-hydroxy-5-isopropyl-2-methylbenzene.
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Which circle contains the mixture? Is it D?
600.0 ml of a 0.385 M solution of LiCl is diluted to 900.0 ml. What is the new concentration of the solution.
Taking into account the definition of dilution, the new concentration of the solution is 0.2567 M.
First of all, you have to know that dilution is the reduction in concentration of a chemical in a solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volumeof the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volume
In this case, you know:
Ci= 0.385 M Vi= 600 mL= 0.600 L (being 1000 mL= 1 L) Cf= ? Vf= 900 mL= 0.900 LReplacing in the definition of dilution:
0.385 M× 0.600 L= Cf× 0.900 L
Solving:
Cf= (0.385 M× 0.600 L)÷ 0.900 L
Cf= 0.2567 M
In summary, the new concentration of the solution is 0.2567 M.
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brainly.com/question/20113402?referrer=searchResults brainly.com/question/22762236?referrer=searchResultsWhich of the following is a salt?
C6H12O6
O2
C2H2
K C l
Answer:
it's kcl
Explanation:
the kcl should be salt
On the 14 point pH scale, soaps and cleaning solutions are typically -
Question 7 options:
0-6
8-14
7
Answer:The answer is 8-14
Explanation:It can range from 9-10 or
or above to 14 depending on the amount of leached wood ash(lye) a.k.a potassium carbonate which is an alkalline compound
Answer:
8-14
Explanation:
What is equivalent to 750 joules
Answer:
0.179254 kilocalories
Explanation:
divide the energy value by 4184
[tex]0.179254[/tex] that would be your answer
What is the mass of some honey that has a volume of 120.8 fl oz and a density of 1.38 kg/L?
Answer:
166.704
Explanation:
What is the molarity of a solution that contains 0.505 mol KCl (molar mass = 74.55 g/mol) in 7.98 L of solution?
Answer:c
=
0.0253 M
Explanation:
Molarity is a measure of a solution's concentration in terms of how many moles of solute it contains per liter of solution.
So, in essence, if you have the number of moles of solute, like you do here, and the total volume of the solution expressed in liters, you can find how many moles of solute you get per liter, i.e. the molarity of the solution.
Keeping in mind the fact that the moles of solute are distributed evenly in any given volume of the solution, you can say that because
7.98 L
of solution contain
0.202
moles of solute, which in your case is potassium chloride,
KCl
,
1 L
of this solution will contain
1
L
⋅
0.202 moles KCl
7.98
L
=
0.0253 moles KCl
So, if your solution contains
0.0253
moles of potassium chloride per liter, it follows that its molarity is equal to
c
=
0.0253 M
Here
M
is equivalent to
mol/L
, or molar.
The molarity of the solution that contains 0.505 mol KCl in 7.98 L of the solution is 0.0632 moles/L.
What is called the Molarity of a solution?Molarity is a measure of a solution concentration in terms of how many moles of solute it contains per liter of solution.
Molarity = Moles of solute / Liters of solution
Its unit is mole/L
Calculating the molarity of the given solution:Given that a solution contains 0.505 mol KCl in 7.98 L of solution
Moles of solute (KCl) = 0.505 mol
Liters of solution = 7.98 L
Then, the molarity will be
M = [tex]\frac{0.505}{7.98}[/tex]
= 0.0632 moles/L
Therefore, the molarity of the given solution is 0.0632 moles/L.
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PLS HELP WORTH 25 POINTS WILL MARK BRAINLIEST IF CORRECT
Examine the false statement. When pressure is added to a reaction at chemical equilibrium, the reaction responds by increasing the amount of pressure it exerts on its surroundings. Select the rewording that makes the statement true.
A. When pressure is added to a reaction at chemical equilibrium, the reaction responds by increasing the rate of reaction, which will decrease the number of particles and offset the pressure.
B. When pressure is removed from a reaction at chemical equilibrium, the reaction responds by decreasing the amount of pressure it exerts on its surroundings.
C. When pressure is removed from a reaction at chemical equilibrium, the reaction responds by increasing the rate of reaction, which will decrease the number of particles and increase the pressure.
D. When pressure is removed from a reaction at chemical equilibrium, the reaction responds by decreasing the amount of pressure it releases to its surroundings.
E. When pressure is added to a reaction at chemical equilibrium, the reaction responds by decreasing the amount of pressure it absorbs from its surroundings.
IT'S NOT C OR E
Answer:
A i think. Good luck!!!!
wat are the dangers of chemicals in the laboratory
What would be the product when combustion reaction occurs in a small tightly-closed container?
Answer:
Incomplete combustion produces carbon monoxide along with some carbon dioxide. Water is always produced during combustion. If the fuel is sulfur containing, carbon disulfide will result as well.
Have a happy day! <3Miss Hawaii
Explanation:
The electronic transition in a hydrogen atom from n = 7 to n = 2 emits electromagnetic radiation having a longer wavelength than a transition from n = 6 to n = 3.
Answer: I'll leave the answer rounded to three sig figs.
mark me brainlist
So, you can say that in a hydrogen atom, an electron located on
n
i
=
2
that absorbs a photon of energy
4.85
⋅
10
−
19
J
can make the jump to
n
f
=
6
.
Explanation:
The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from
n
i
=
2
to
n
f
=
6
.
A good starting point here will be to calculate the energy of the photon emitted when the electron falls from
n
i
=
6
to
n
f
=
2
by using the Rydberg equation.
Describe the difference between at atom and an ion in regards to their substaomic
particles
Answer:
difference between atom and ion
Explanation:
What is an Atom?
The smallest unit of matter. It is indivisible and consists of neutrons, electrons and protons. Atoms can take part in chemical reactions. Combination of atoms together forms molecule. Always the number of protons and electrons are equal. Independent life may or may not be feasible within a solution. Nucleus of the atom is formed by protons and neutrons. Surrounding the nucleus are the electrons.
What is an Ion?
Atoms where the electrons and protons are not equal are called ions. Ions are charged particles. They can be either positively charged ions or negatively charged ions. If an atom is charged electrically it is considered an ion. If an atom contains maximum number of electrons than protons, then it is called anion. If an atom contains maximum number of protons than electrons, then it is called cation. Independent existence in a solution. When an atom gains or loses electrons, ion is formed.
To make you understand how atom and ion are different from each other, here are the some major differences between atom and ion:
how many grams of hydrogen in 1.85moles
what classifies materials as a pure substance or a mixture
Answer:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.
Please answer question (e)
Answer:
I don't know sorry am read in 5 class
When ice turns into a liquid, this is a __1__ change because __2__.
Answer:
1.physical change because the ice from a solidform cahnged into a liquid form
Based on the results of the genetic crosses you have shown how think the red and white flower alleles can "interact with one another? Explain both the F¹ and F² generations. ps.. ill mark you the brainliest
Answer:
in f1 its shows all hybrid red
Explanation:
RR rr
R R
Question 5 of 5
The rows in the periodic table are called periods. What is true about elements
in the same period?
O A. They have the same atomic mass.
B. Their atomic numbers increase by 1 from left to right.
C. Their magnetism increases in strength from left to right.
D. They have similar chemical properties.
SUBMIT
Answer:
B. Their atomic numbers increase by 1 from left to right
Alka-Seltzer is pure NaHCO3
True or false?
Answer:
falso
Explanation:
Calculate the number of Calories in a 5 fluid oz glass of red wine that contains 2.1 g carbohydrate and 13.8 g alcohol.
Answer:
ù
Explanation:
What are the 26 states of matter?
Bose–Einstein condensate.
Fermionic condensate.
Degenerate matter.
Quantum Hall.
Rydberg matter.
Rydberg polaron.
Strange matter.
Superfluid
In this case, the amount of calories is 105 calories.
One gram of alcohol provides approx. 7 calories, whereas one gram of carbohydrates contains 4 calories.In this case, the number of calories can be calculated by summing the calories provided by alcohol and carbohydrates.Number of calories = (2.1g x 4) + (13.8g x 7) = 8.4 + 96.6 = 105 calIn conclusion, the amount of calories, in this case, is 105 calories.
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Part D
Based on the activity series you created in part C, predict whether there would be a chemical reaction or no
reaction when the listed pairs of substances are combined.
Answer:
magnesium and copper(II) sulfate no reaction
iron and magnesium sulfate reaction
copper and iron(III) nitrate reaction
magnesium and hydrochloric acid reaction
Explanation:
A line can be used to represent a covalent bond between two atoms. Diagram pairs of atoms
that can form single, double, and triple bonds.
Can every atom form each of these kinds of bonds?
The covalent bond has been formed by the atom with the difference in the electronegativities and the presence of loan pair for an unsaturated bond.
The covalent bond has been formed between the atoms when there has been the sharing of electrons. The presence of loan pairs results in the formation of pi bonds, which are unsaturated covalent sharing formed above or below the covalent bonds.
An example of pair with a single bond has been:
H-HO-OThe examples of pairs with double bonds:
HHC=CHHC=OThe examples of pairs with triple bonds:
N [tex]\equiv[/tex] NHC [tex]\equiv[/tex] CHNot every atom can form these bonds as there has been the presence of loan pairs with the atom for the formation of the double and triple bond.
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Summarize the steps of water cycle
Answer:
The water cycle consists of three major processes: evaporation, condensation, and precipitation. Evaporation is the process of a liquid's surface changing to a gas. In the water cycle, liquid water (in the ocean, lakes, or rivers) evaporates and becomes water vapor.
Explanation:
draw the lewis dot structure of C4H8N2O3
Explanation:
Refer to the attachment
Extrashots:-
C4H8N2O3 is called asparagine .