PLEASE HELP ASAP THANK YOU!!
Answer:
C. It represents the heat involved in a reaction
Explanation: It would make sense since most of the time h in chemistry
is the equivalent to heat.
I hope this helped you!
If you took 800mg of aspirin tablet at 12:00pm and another 800mg tablet at 2pm, how many milligrams of aspirin are still in your system at 3pm? Aspirin has a t1/2 of 1 hour.
Don't you dare put a link. I have a very specific set of skills >.>
(Chemistry is unfortunately not one of them though, so please help me ^-^)
Answer:
100mg are in your system at 3pm
Explanation:
Half-life is the time necessary to decrease the initial amount of a substance in the half.
At 12:00pm, the amount of aspirin is 800mg
As half-life is 1h,
at 1:00pm, the amount of aspirin is 800mg/2 = 400mg
At 2:00pm, 400mg/2 = 200mg
At 3:00pm, 200mg/2 =
100mg are in your system at 3pmWhat are the units for the Volume of any Polyhedron?
Explanation:
A prism is a polyhedron with two parallel, congruent faces called bases that are polygons . The volume of a 3 -dimensional solid is the amount of space it occupies. Volume is measured in cubic units ( in3,ft3,cm3,m3 , et cetera).
Answer:
A cube with side length 1 unit, called a “unit cube,” is said to have “one cubic unit” of volume, and can be used to measure volume.
QUICK PLEASE
What is the final concentration when 275 mL of 20.0 % W/V hydrogen peroxide solution is diluted to 1.000 L?
20.0 % W/V
0.30 % W/V
55.0 % W/V
5.50 % W/V
Answer:
20.0% w/v A
Explanation:
A 20.0 w/V...
ano ang kahulugan ng sekswalidad?
ano ang naakit sa isang tao..at kung ano ang iyong kasarian ay
What does the octet rule state that explains why atoms bond?
Answer:
An atom bonds to have eight valence electrons to become stable. ... The third shell would be empty so that the eight electrons in the second level would be outermost after the atom loses one electron.
Explanation:
What is a conjugate acid-base pair?
Answer:
A
Explanation:
In the Brønsted-Lowry definition of acids and bases, a conjugate acid-base pair consists of two substances that differ only by the presence of a proton (H⁺).
What is the net ionic equation for the following reactant?
Al (s) + HCl (aq) -->
Explanation:
hope the picture above helps u to understand:)
Which of the following measurements contains 2 significant figures?
A 0.0240
С 0.0901
B 371
D 1.0x10
E 0.004
HNO3 + S --> H2SO4 + NO Now identify the element oxidized and the element reduced. Which element is oxidized? Which element is reduced? Which elements undergo no oxidation or reduction?
Answer: S is getting oxidized, N is getting reduced and O and H undergo no oxidation or reduction
Explanation:
The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction. It occurs when oxidation number of a species increases.
A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction. It occurs when oxidation number of a species decreases.
For the given chemical reaction:
[tex]HNO_3+S\rightarrow H_2SO_4+NO[/tex]
On the reactant side:
Oxidation number of H = +1
Oxidation number of N = +5
Oxidation number of O = -2
Oxidation number of S = 0
On the product side:
Oxidation number of H = +1
Oxidation number of N = +2
Oxidation number of O = -2
Oxidation number of S = +6
As the oxidation number of S is increasing from 0 to +6. Thus, it is getting oxidized. Similarly, the oxidation number of N is decreasing from +5 to +2. Thus, it is getting reduced.
The oxidation numbers of O and H remain the same on both sides of the reaction. Thus, they are neither getting oxidized or reduced.
Hence, S is getting oxidized, N is getting reduced and O and H undergo no oxidation or reduction
Complete the missing information in the reactions. Then, label each reaction as Alpha
(a) or Beta (B) decay.
14
0
N
9
Type: :
n:
p:
n:
p:
n:
P:
238
U
10. 92
234
Th
90
+
Type: :
n:
n:
p:
n:
p:
I
p:
0
32
11 15
P
Type: :
n:
n:
n:
p:
P:
P:
4
244
Pu
12 94
He
Type:
n:
n:
n:
p
p:
p:
Answer:
rtyuioroiytryu
Explanation:
help me balence: ___ H2 + ___ O2----> _____ H20
Explanation:
2H2+O2------->2H2O
its yr balanced equation.
hope it helps
stay safe healthy and happy....226 • Ra 4/2 He + 88 = ?
Answer: the answer for this question is in the pic
Explanation:
What is the balanced equation for the
equilibrium reaction where the aqueous
bicarbonate ion, HCO3(aq); decomposes to
form hydrogen ions, H,
(aq), and carbonate
ions, CO2 ?
Answer: A balanced equation for the equilibrium reaction where the aqueous bicarbonate ion, [tex]HCO^{-}_{3}(aq)[/tex]; decomposes to form hydrogen ions, [tex]H^{+}(aq)[/tex] and carbonate ions, [tex]CO^{2-}_{3}[/tex] is [tex]HCO^{-}_{3} \rightleftharpoons H^{+}(aq) + CO^{2-}_{3}[/tex].
Explanation:
A balanced chemical equation is defined as the equation which contains same number of atoms on both reactant and product side.
Hence, balanced equation for the equilibrium reaction where the aqueous bicarbonate ion, [tex]HCO^{-}_{3}(aq)[/tex]; decomposes to form hydrogen ions, [tex]H^{+}(aq)[/tex] and carbonate ions, [tex]CO^{2-}_{3}[/tex] is as follows.
[tex]HCO^{-}_{3} \rightleftharpoons H^{+}(aq) + CO^{2-}_{3}[/tex]
Here, number of atoms present on reactant side are as follows.
H = 1C = 1O = 3Number of atoms present on product side are as follows.
H = 1C = 1O = 3Since, there are same number of atoms present on both reactant and product side. Therefore, this equation is balanced.
Thus, we can conclude that balanced equation for the equilibrium reaction where the aqueous bicarbonate ion, [tex]HCO^{-}_{3}(aq)[/tex]; decomposes to form hydrogen ions, [tex]H^{+}(aq)[/tex] and carbonate ions, [tex]CO^{2-}_{3}[/tex] is [tex]HCO^{-}_{3} \rightleftharpoons H^{+}(aq) + CO^{2-}_{3}[/tex].
To draw a Lewis structure for a covalent compound, begin by calculating A, the available electrons, and N, the needed electrons. What is N for silicon tetrachloride, SiCl4?
Answer:
To draw a Lewis structure for a covalent compound, begin by calculating A, the available electrons, and N, the needed electrons.
What is N for silicon tetrachloride, SiCl4?
Explanation:
A covalent compound is formed by the mutual sharing of electrons between two atoms.
According to Lewis octet theory, every atom wants to attain eight electrons around it.
For the given molecule SiCl4
Silicon has four valence electrons.
To attain the nearest inert gas configuration it requires four more electrons.
Each chlorine atom shares an electron and thus silicon attains eight electrons in its valence shell.
The Chlorine atom has seven valence electrons.
To get eight electrons in its valence shell it needs one more electron.
That is shared by the silicon atom.
Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.
N value for Si is --- 4.
A the available electrons for Si is ---- 4.
The available electrons for Si 4 and the needed electrons are also 4. A covalent compound is formed by the equal sharing of electrons between two atoms.
A covalent compound is formed by the equal sharing of electrons between two atoms.
According to Lewis octet theory, every atom wants to attain eight electrons in the shell.
For the given molecule [tex]\bold {SiCl_4}[/tex]
Silicon has four valence electrons and Chlorine has 7 electrons in the valence shell. It requires four more electrons to attain the nearest inert gas configuration for silicon and one more electron for chlorine. Each chlorine atom shares an electron and thus silicon attains eight electrons in its valence shell.
Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.
Therefore, the available electrons for Si 4 and the needed electrons are also 4.
To know more about Lewis Structure,
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Se tiene una solución acuosa 2M de carbonato de potasio. Expresar su concentración en %p/v y Normalidad.
Answer:
Normalidad = 4N
%p/V = 27.6%
Explanation:
La solución 2M de carbonato de potasio contiene 2moles de carbonato por litro de solución. La normalidad son los equivalente de carbonato de potasio (2eq/mol) por litro de solución:
2moles * (2eq/mol) = 4eq / 1L = 4N
El porcentaje peso volumen es el peso de carbonato en gramos dividido en el volumen en mL por 100:
%p/V:
Masa K2CO3 -Masa molar: 138.205g/mol-
2moles * (138.205g/mol) = 276g K2CO3
Volumen:
1L * (1000mL/1L) = 1000mL
%p/V:
276g K2CO3 / 1000mL * 100
%p/V = 27.6%how many moles are in 54g of sliver
Answer:
0.50 mols Ag
Explanation:
Given the data, we have:
mass= 54g
molar mass of Silver (Ag): 107.8 g/mol
We want moles, we can convert grams > moles using the molar mass as a "bridge" between the 2.
[tex]54g * \frac{1 mol}{107.8 g}= 0.50 mols Ag[/tex]
Keeping an eye on the units, we'll see 54g get cancelled out by 107.8 g/mol and we'll be left with moles of Silver.
An ion and its parent atom differ in....? 1) All of the options are correct 2) electron configuration. 3) chemical reactivity. 4) number of electrons.
For each of the following sets of elements, state whether all of the elements are in the same group, the same period, or neither the same group or the same period.
a. Fe, Ru, Os
b. Rh, Pd, Ag
c. Sn, As, S
d. Se, Te, Po
Answer:
a. Same group, different period
b. Different group, same period
c. Different group, different period
d. Same group, different period
Para el elemento de Z-56 b, que formula minima tiene el compuesto que forma con 17-cl¿ c, que tipo de union hay en dicho compuesto¿ d, cual es la estructura de lewis del compuesto formado¿
Answer:
ver explicacion
Explanation:
El elemento que tiene el número atómico 56 en la tabla periódica del bario. El bario es un elemento del grupo dos.
Se combina con el cloro para formar cloruro de bario. que tiene la fórmula BaCl2 de acuerdo con la valencia de ambos elementos.
El cloruro de bario es un compuesto iónico.
Which of the following solutions is the weakest base?
a) pH 2.3
b) pH 4.6
c) pH 6.6
d) pH 7.9
e) 12.5
Answer:
solution d with pH of 7.9
For a reaction, Delta * H ^ 0 = - 75KJ / m * o * l and triangle S^ 0 =-0.081KJ/(K* mol) . At what temperatures is this reaction spontaneous?
Answer:
At temperatures below 924.93K.
Explanation:
Hello there!
In this case, according to the thermodynamic definition of the Gibbs free energy of reaction:
[tex]\Delta G=\Delta H-T\Delta S[/tex]
Now, for us to determine the correct temperature range, we must make ΔG=0 and solve for T:
[tex]T=\frac{\Delta H}{\Delta S} =\frac{-75kJ/mol}{-0.081kJ/mol-K}\\\\T=925.93K[/tex]
Thus at temperatures below 925.93 K we will have an spontaneous reaction (ΔG<0).
Regards!
What mass of methanol (CH3OH) is produced when 140.1 g of carbon
monoxide reacts with 12.12 g of hydrogen?
CO(g) + 2H2(g) → CH2OH()
A. 160.2g
B. 96.12 g
C. 6.06 g
D. 192.2g
Answer:
B. 96.12 g
Explanation:
To solve this question we must convert each reactant to moles. Using the balanced equation we can find limiting reactant. With moles of limiting reactant we can find the moles of methanol and its mass:
Moles CO -Molar mass: 28.01g/mol-
140.1g CO * (1mol / 28.01g) = 5.0 moles CO
Moles H2 -Molar mass: 2.01g/mol-
12.12g * (1mol / 2.01g) = 6.03 moles H2
For a complete reaction of 5.0 moles of CO are required:
5.0moles CO * (2mol H2 / 1mol CO) = 10.0 moles of H2 are required
As there are just 6.03 moles, H2 is limiting reactant.
The moles of methanol produced are:
6.03 moles H2 * (1mol CH3OH / 2mol H2) = 3.015 moles CH2OH
Mass CH3OH -Molar mass32.04g/mol-:
3.015 moles CH2OH * (32.04g/mol) =
96.6g CH3OH ≈ B. 96.12 g
Vincent dissolves 6.5 g of bromic acid, HBrO3, to prepare 600.0 mL of solution. Calculate the concentration of the acid Vincent produced.
Answer: The concentration of the acid Vincent produced is 0.083 M.
Explanation:
Given: Mass = 6.5 g
Volume = 600.0 mL (1 mL = 0.001 L) = 0.6 L
Moles is the mass of substance divided by its molar mass. So, moles of bromic acid (molar mass = 128.91 g/mol) are calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{6.5 g}{128.91 g/mol}\\= 0.05 mol[/tex]
Molarity is the number of moles of a substance present in liter of a solution.
Therefore, molarity (concentration) of the given solution is calculated as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.05 mol}{0.6 L}\\= 0.083 M[/tex]
Thus, we can conclude that the concentration of the acid Vincent produced is 0.083 M.
How is an alkoxide ion formed??
Si de una caja de gelatina de 30g, se obtiene 5 porciones. Cuantas cajas y cuantos gramos se requieren para preparar 100 porciones.? respuestas concretas por fis
Answer:
20 cajas - 600 gramos
Explanation:
Veamos los datos informados:
1 caja → 5 porciones
1 caja → 30 g
Si queremos preparar 100 porciones, indudablemente necesitamos:
100 porciones . 1 caja / 5porciones = 20 cajas
Finalmente ya sabemos que una caja tiene 30 g
Entonces, si tenemos 20 cajas . 30 g / 1 caja = 600 g
En conclusión:
Necesitamos una masa total de 600 gramos en 20 cajas
Which best describes a radioactive isotope?
Answer:
A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.
Answer:
unstable
Explanation:
Which process produces the energy that is used in photosynthesis?
O A. Nuclear fusion
B. Chemical reactions
C. Nuclear fission
D. Nuclear decay
Answer: Nuclear fusion
Explanation:
The process that produces the energy that is used in photosynthesis is nuclear fusion. option A is correct.
Photosynthesis is the process by which light energy is converted into chemical energy in the form of sugars. This chemical energy is produced as a result of nuclear fusion reaction .
Photosynthesis takes place in chloroplasts of plants, which are found in the mesophyll of leaves. Inside the chloroplast, is the thylakoids, where the chlorophyll absorbs the various hues of light and nuclear fusion reaction takes place to create energy .
Using light energy, oxygen is produced as a byproduct while carbon dioxide and water are converted to glucose .
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HELPPP!!!
The emission of electromagnetic energy from an atomic nucleus is called_______
decay.
Gamma decay, type of radioactivity in which some unstable atomic nuclei dissipate excess energy by a spontaneous electromagnetic process. In the most common form of gamma decay, known as gamma emission, gamma rays (photons, or packets of electromagnetic energy, of extremely short wavelength) are radiated.
Which of the following is a redox reaction? (HELP ASAAAP)
A)
MgCO3 → MgO + CO2
B)
Mg(OH)2 + 2HCl → MgCl2 + H2O
C)
CuO + H2SO4 → CuSO4 + H2O
D)
3MnO2 + 4Al → 3Mn + 2Al2O3
Answer:
D
Explanation:
Al is a reducing agent because it removes Oxygen from another compound
Mno2 is an oxidizing agent