Answer:
0.021
Explanation:
Step 1: Write the balanced equation
2 HF(g) ⇄ H₂(g) + F₂(g)
Step 2: Calculate the value of the concentration equilibrium constant
The concentration equilibrium constant (K) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.
K for this reaction is:
K = [H₂] × [F₂] / [HF]²
K = (8.4 × 10⁻³) × (8.4 × 10⁻³) / (5.82 × 10⁻²)² = 0.021
How many units long is the circumference of a circle with diameter of 18 units?
Answer:
56.52 units
Explanation:
hope that helps :)
How many liters of hydrogen are obtained from the reaction of 4.00 g sodium with excess water, at STP?
Answer:
V = 1.95 L.
Explanation:
Hell there!
In this case, according to the following reaction between sodium metal and water:
[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
We can realize that the moles of hydrogen can be calculated by using the initial mass of sodium, its atomic mass (23.0 g/mol) and the 2:1 mole ratio of sodium to hydrogen to obtain:
[tex]4.00gNa*\frac{1molNa}{23.0gNa} *\frac{1molH_2}{2molNa}=0.0870molH_2[/tex]
Finally, we calculate the volume of hydrogen by using the ideal gas equation whereas the pressure is 1 atm and the temperature 273.15 K according to the STP conditions:
[tex]PV=nRT\\\\V=\frac{nRT}{P}\\\\V=\frac{0.0870mol*0.08206\frac{atm*L}{mol*K}*273.15 K}{1 atm}\\\\V=1.95L[/tex]
Regards!
what type of reaction is Pb + CuCl2 ---> PbCl2 + Cu
The above reaction is a Single displacement reaction , in which lead (Pb) being more reactive displaces Copper (Cu) from its compound [tex](\mathrm{CuCl_2})[/tex] and forms Lead Chloride [tex](\mathrm{PbCl_2})[/tex].
[tex] \boxed{\mathrm{Pb + CuCl_2 \rightarrow PbCl_2 + Cu}}[/tex]
_____________________________
[tex]\mathrm{ \#TeeNForeveR} \: ☃[/tex]
Which of the following are HETEROGENEOUS mixtures from this list (check all that apply).
A. Air
B. Sweet Tea
C. Trail mix
D. Soil
E. Beach sand
F. Water
is zinc an example of a element or compound?
Answer:
Zinc is an element.
Explanation:
Compounds are composed of two or more elements
Answer:
element
Explanation:
zinc is an element with atomic number 30
How many grams of H2 are needed to completely react within 50g of N2?
Answer: 10.7 grams
Therefore, 10.7 grams of Hydrogen are necessary to fully react with 50.0 grams of Nitrogen.
Why are infants and children often more susceptible to the effects of toxic substances than adult? (Explain)
From what I know personally from learning about this type of subject in the past is that children are more susceptible to the effects of toxic substances more than adults are, certain scientific data specifically indicate that children actually are for all intents and purposes more basically susceptible to toxic exposure than adults because they for the most part have proportionally definitely more intake of food contaminants, basically active developmental processes, basically multiple exposure pathways and really susceptible kind of socio-behavioral activities in a particularly major way.
Helium only has two valence electrons and is a stable atom. How is this possible when atoms
need 8 valence electron to become stable?
Answer:
Explanation:
Helium (He) is similar in that it, too, only has room for two electrons in its only valence shell. Hydrogen and helium have only one electron shell. The first shell has only one s orbital and no p orbital, so it holds only two electrons. Therefore, these elements are most stable when they have two electrons.
Water and oil are "immiscible", meaning they do not mix but stay
separated when combined in a glass. What is the best explanation for this?
1.both are polar molecules
2.both are nonpolar molecules
3.water is a polar molecule and oil is a nonpolar molecule
4.water and oil are both compounds
Answer:
Good luck man
Explanation:
Good luck man
What can be different between the products and reactants in a balanced chemical equation?
Answer:Reactants are starting materials and are written on the left-hand side of the equation. Products are the end-result of the reaction and are written on the right-hand side of the equation.
Explanation:
The reactants in a balanced chemical reaction are the starting material which reacts together to give the products in by the regrouping of atoms in the reactants.
What is a balanced chemical equation?The balanced chemical equation of a reaction represents the perfect stoichiometry of each reactants and products with their states of matter in brackets.
In a balanced reaction, the number of each element in the reactant side must be equal to their number in the product side. The number of each elements and groups in a reaction can be balanced by multiplying with suitable integers.
The atoms in the reactants are regrouping to form the products. Thus, the identity of the new products is entirely different form that of reactants in the reaction.
To find more on balanced reactions, refer here:
https://brainly.com/question/14280002
#SPJ2
PLEASE HELP QUICKLY!!
I know it's not A or B; I just can't figure it out between C and D.
---
What will most likely happen when a component is added to a reaction system at equilibrium?
A. The system will be unaffected by stress.
B. The addition of a catalyst will change the equilibrium.
C. The equilibrium position will shift away from what was added to lower its concentration.
D. The equilibrium position will shift away from what was added to increase its concentration.
Answer:
c: The equilibrium position will shift away from what was added to lower its concentration.
Explanation:
Answer: C. The equilibrium position will shift away from what was added to lower its concentration.
Explanation:
If we have a system that is already in equilibrium, the addition of an extra amount of one of the reactants or one of the products throws the system out of equilibrium. Either the forward or the reverse reaction will then occur to restore equilibrium conditions.
pls help it's about density
Is everything correct?
If an atom has 8 electrons and 8 protons and 9 neutrons then what is it's net charge?"
choices:
0
1+
1-
2-
How does increased exhalation of CO2 at the lungs (pulmonary regulation) restore the correct pH range?
Answer:
When CO2 levels become excessive, a condition known as acidosis occurs. This is defined as the pH of the
blood becoming less than 7.35. The body maintains the balance mainly by using bicarbonate ions in the
blood. As the body responds to neutralize this condition, an electrolyte imbalance – an increase of plasma
chloride, potassium, calcium and sodium, can occur.
A nebula is often made up of hydrogen and helium gases.
True
False
Answer:
Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.
Explanation:
Hope this helps
When 0.875 g. of magnesium was heated in air, 1.25 g. of magnesium oxide
(MgO) was produced. How much oxygen must be added?
Answer:
1. What is the coefficient for calcium in the balanced equation?
2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2
2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must
write the equation, balance it and solve the mass-mass problem.
a. Balanced equation:
2 C2H2 + 5 O2 4 CO2 + 2 H2O
Explanation:
Write the molecular formula of poly(glycine)
Answer:
C2H5NO2
Explanation:
Glycine | C2H5NO2 - PubChem.
weight of glycine= 75.07 g/mol
In order to tell the difference between microwaves and visible light in the blue range, which of the following measurements should be made?
Answer:
microwaves should be made
Answer:
answer choices plzzzzz
ima edit my answer wht are the choices
Explanation:
mrk mE BRAINLIEST PLZZZZZZZZZZZz
C
ot 헤
C.
Show that the results of these dulys
Calculate the oxidation state of Manganese in the following
i. KMnO4 ii. Mno4-
i) KMnO4
lets calculate using x method
1+x+ 4(-2) = 0
1+x-8 =0
x= 7
ii)MnO4‐
x+4(-2) = -1
x-8 = -1
x = 7
Is sulfur pentoxide a ionic or covalent bond?
PLS HELP FOR FINAL!!!!!!!!!!!!!!
Answer:
The answer is Ernest Rutherford.
Answer :
Ernest RutherfordHope I helpGood Luck
ILL MARK BRAINLIEST :)
Describe the law of conservation of mass in your own words *DO IT IN YOUR OWN WORDS PLEASE*
Explanation:
According to the law of conservation of mass, mass can neither be created nor destroyed but it can simply be transformed from one form to another.
For example, [tex]Na^{+} + Cl^{-} \rightarrow NaCl[/tex]
Mass of Na = 23 g/mol
Mass of Cl = 35.5 g/mol
Sum of mass of reactants = mass of Na + mass of Cl
= 23 + 35.5 g/mol
= 58.5 g/mol
Mass of product formed is as follows.
Mass of NaCl = mass of Na + mass of Cl
= (23 g/mol + 35.5) g/mol
= 58.5 g/mol
As mass reacted is equal to the amount of mass formed. This shows that mass is conserved.
As a result, law of conservation of mass is obeyed.
Which is the correct Lewis dot structure of NH2?
H-N-H
H-N-H
A.
B.
N-H-H
H-N-H
C.
D.
-H-N-H
E.
ОА А
ов. В
C C
OD D
ОЕ Е
Answer:
D
Explanation:
TEACH ME how to do question 2 through your explanations.
Answer:
Explanation:
The first two are easy:
H2O, H3O+ and OH- all exist in an equilibrium
[H3O+] = [OH-] = 10^-7 M
HCl is a strong acid so 1M of it will disassociate completely
[H3O+] = [Cl-] = 1 M
The third one is also an equilibrium as HNO2 is a weak acid. Ka is given so [HNO2] and [NO2-] can be calculated.
The fourth one is a buffer solution so its pH can be looked up to give the concentrations.
Answer:
Explanation:
H20 has pH of 7
1st reaction [H30+] = 10^-7M
[OH-] = 10^-7M
1M HCl has pH of 0
2nd reaction [H3O+] = 1M
[Cl-] = 1M
given Ka = 4.6x10^-3 = [H3O+]x[NO2-] / [HNO2]
and [HNO2] + [NO2-] = 1M
each concentration can be solved
beaker D is a buffer solution n requires more info 2 solve
Select the correct answer.
A compound has an empirical formula of C2H5. What is true about this empirical formula?
ОА It models the structure of the compound.
ОВ. It shows the ratio of elements in the compound.
Ос. . It gives the mass of each atom in the compound.
OD. It indicates the number of atoms in the compound.
O E. It describes only this one compound.
Answer: OB
Explanation:
The empirical formula of an element is the simplest formula of an element which shows the ratios of atoms of the each element present in a molecule of a compound .
Iodine-131 half life 8.040 how long will it take for a 40 gram sample of iodine-131 to decay to 0.75 grams
Answer:
See explanation below
Explanation:
To get this, we need to apply the general expression for half life decay:
N = N₀e(-λt) (1)
Where:
N and N₀ would be the final and innitial quantities, in this case, masses.
t: time required to decay
λ: factor related to half life
From the above expression we need λ and t. To get λ we use the following expression:
λ = t₁₂/ln2 (2)
And we have the value of half life, so, replacing we have:
λ = 8.04 / ln2 = 11.6
Now, we can replace in (1) and then, solve for t:
0.75 = 40 exp(-11.6t)
0.75 / 40 = exp(-11.6t)
ln(0.01875) = -11.6t
-3.9766 = -11.6t
t = -3.9766 / -11.6
t = 0.34 daysA sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure
were changed to 760 mmHg at the same temperature?
show work
P1: 741 mmHg
V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L
P2: 760 mmHg
V2: ? L
Which statement is true in comparison to a weak acid, a strong acid
has a larger ph than weak acids
is more concentrated than we gases
strong acids produced less H plus ions is mostly H plus ions in solution
Answer: Strong acid vs weak acid
Strong acids and strong bases refer to species that completely dissociate to form ions in solution.
Explanation: By contrast, weak acids and bases ionize only partially, and the ionization reaction is reversible. Thus, weak acid and base solutions contain multiple charged and uncharged species in dynamic equilibrium.
an organism that lives in or on another organism and causes harm to is a
A. host
B. parasite
C. prey
D. producer
the answer is B. Parasite.