Answer:
The answer is D.
Explanation:
Silver consists of 92.5% silver, and the remaining part is copper. ... Pure silver is not susceptible to tarnish in a pure oxygen environment. However, the copper that is contained in 925 sterling silver may react to the ozone and hydrogen sulfide in the air and cause sterling silver to tarnish.
Which of these compounds has the greatest percentage of nitrogen? NO2 N2O4 N3O6
Answer:
Same in all compounds
Explanation:
We know that
mass percentage of N = [mass of N/ mass of compound] ×100
In NO2, N% = 14/(14+32)×100
= 14/46×100
= 30.43%
In, N2O4, N% = 28/(28+64) ×100 = 28/92×100 =30.43%
Similarly, in N3O6 also the % of N = 30.43%
So, percentage of Nitrogen is same in all given compound. That is 30.43%
if 7.6 moles of H2O are produced from the reaction how many moles of O2 were used?
Answer:
Number of moles of oxygen used=13.5moles
Explanation:
To know the number of moles of oxygen used, first calculate the molar mass of water.
H2O=(2*1)+(1*16)
=2+16
18g/mol of H2O
The moles of H2O is 7.6 moles
So first, find the molar mass of oxygen
O2=2*16
=32g/mol
Then, number of moles of oxygen is equal to molar mass of oxygen divide by the molar mass of water times the number of moles of water
No. moles of O2=[32g/mol]/[18g/mol] *7.6moles
Moles of O2=1.778*7.6moles
No.moles of O2=13.5 moles
Therefore, the number of moles of oxygen used was 13.5moles
What is the volume of 0.150 M sodium hydroxide, required to react completely with 250.0 mL of 0.545 M acetic acid, CH3COOH solution?
Answer:
68.81ml
Explanation:
Using the formula:
CaVa = CbVb
Where;
Ca = concentration of acid (M)
Cb = concentration of base (M)
Va = volume of acid (ml)
Vb = volume of base (ml)
Based on the information given in this question;
Ca = 0.545M
Cb = 0.150M
Va = 250ml
Vb = ?
Using CaVa = CbVb
0.545/250 = 0.150/Vb
Cross multiply
250 × 0.150 = 0.545Vb
37.5 = 0.545Vb
Vb = 37.5/0.545
Vb = 68.81ml
را
Which statement describes an intensive property of matter?
O It is the same for every sample of a single substance.
O It depends on how a substance was formed.
O It is the same for every sample of every substance.
O It depends on the amount of substance present.
Answer:
A.It is the same for every sample of a single substance.
Explanation:
A student is taking notes about the four steps in hurricane formation. Which of the following should be written as step number 1?
A
tropical disturbance
B
tropical depression
C
tropical storm
D
hurricane
A loose pile of rocks and soil travels in a single large mass the mass moves a short distance downhill which mass movement does this describe
A. Creep
B. Erosion
C. Landslide
D. Slump
When pH changes from 6 to 3, how many times does acidity increase?
Since a pH of 3 is three numbers higher than a pH of 6, we can find the change in acidity by taking 10 to the third power. The solution with a pH of 3 is 1000 times more acidic than the solution with a pH of 6.
Who goes to K12 and if so what grade
Answer:
I do. I am in tenth. What area are you in?
Explanation:
Answer:
8th finna be in 9th wbu
Explanation:
Al+3 and I-
what is the chemical formula and what is the name of the compound
Answer:
AlI3 is the chemical formula and the name of compound is Aluminium iodide.
Na2 So4
identify the nature of this reaction
Na2SO4 is not an reaction it is a compound named Sodium Sulfate having molar mass 142 g/mol
Germanium has a face-centered cubic unit cell. The density of germanium is 5.32 g/cm3. Calculate a value for the atomic radius of germanium.
Answer:
1.59x10⁻¹⁰m
Explanation:
To solve this question we must know that the length of the cubic cell, X, is equal to:
X = √8 * R
Where R is the atomic radius of germanium
And that in 1 unit cell there are 4 atoms of germanium.
To solve this question we must find the mass in 1 unit cell, with this mass we can find the volume of the cube and the length. With the length we can know the atomic radius:
Mass in 1 unit cell -Molar mass Ge = 72.64g/mol:
4 atoms Ge * (1mol / 6.022x10²³ atoms) = 6.64x10⁻²⁴ moles Ge
6.64x10⁻²⁴ moles Ge * (72.64g / mol) = 4.825x10⁻²²g Ge
Volume unit cell:
4.825x10⁻²²g Ge * (1cm³ / 5.32g) = 9.07x10⁻²³cm³
Length unit cell:
∛9.07x10⁻²³cm³ = 4.49x10⁻⁸cm * (1m / 100cm) = 4.49x10⁻¹⁰m
Atomic radius Ge:
4.49x10⁻¹⁰m / √8 =
1.59x10⁻¹⁰m3. Calculate the molar mass of
Hg2(NO3)3
The molar mass of Hg2(NO3)3 is 587.1947 g/mol
My source was wrong.
Answer:
molar mass: 587.1947
Explanation:
Element Symbol Atomic weight Atoms Mass percent
Mercury Hg 200.59 2 68.3215
Nitrogen N 14.0067 3 7.1561
Oxygen O 15.9994 9 24.5225
The reaction given below is in equilibrium.
302(g) + 68kcal A 203(8)
Which of the following applications increase O3 production?
o Increasing pressure and decreasing temperature
O Decreasing temperature and pressure
O Decreasing temperature and increasing the amount of O2
O Adding a catalyst
o Increasing temperature and pressure
Answer:
not sure o. increasing pressure and decreasing temperature
what does the distance traveled by each component on the paper strip in paper chromatography depend on
Answer:
PLZ FOLLOWING ME.........................
Which of the following is not an ionic compound
Answer:
bR2 since it is nonpolar
Someone pls help i am being timed!!!!
Answer:
i think it is a the full moon
How many atoms of hydrogen are involved in this reaction?
CH4 + 202 → CO2 + 2H2O
Select the structure that corresponds to the molecule name:
Answer:
Option B
Explanation:
The name of the molecule is;
1,1,1,3,3,3-Hexachloropropanone
Now, we can see that it contains propanone which is also called acetone. So it will have a double bond with Carbon(C) and Oxygen (O).
Option B has that double bond between C and O that indicates it propanone or acetone.
Thus, it is the correct option.
Answer:
It is a ( on the acellus question )
Explanation:
What are some ways organisms in a cave can receive nutrients?
Pls help!!!!
please help science question ! thank you have a great day
Answer:
The particle theory states that the particles of a substance spread out as they gain energy when heated. Thus, the particles take up more space, which means that the density of the substance decreases. It is almost always true that, for each pure sub stance (for example, gold), the density of its solid state is greater than the density
Explanation:
1) Calculate the temperature change for mercury if 160 g of the metal absorbs 1500 J of heat energy. Mercury's specific heat is 0.14 J/g°C.
2) How much heat is given out when 85 g of lead cools from 200.0°C? The specific heat of lead is 0.11 J/g°C
3) What is the final temperature of a substance if 1404 J of energy is added to 38 g of it at 26°C? The specific heat is 0.24 J/g°C
Answer:
1. 66.96°C
2. -1776.5J
3. 179.9°C
Explanation:
Using the formula;
Q = m × c × ∆T
Where;
Q = amount of heat (J)
m = mass (g)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
QUESTION 1:
∆T = ?
m = 160g
c = 0.14 J/g°C
Q = 1500 J
1500 = 160 × 0.14 × ∆T
1500 = 22.4∆T
∆T = 1500/22.4
∆T = 66.96°C
QUESTION 2:
Q = ?
m = 85g
c = 0.11 J/g°C
∆T = 10°C - 200°C = -190°C
Q = 85 × 0.11 × -190
Q = -1776.5J
QUESTION 3:
Q = 1404 J
m = 38g
c = 0.24 J/g°C
Final temperature = ?
Initial temperature = 26°C
1404 = 38 × 0.24 × (T2 - 26)
1404 = 9.12 (T2 - 26)
1404 = 9.12T2 - 237.12
9.12T2 = 1404 + 237.12
9.12T2 = 1641.12
T2 = 1641.12 ÷ 9.12
T2 = 179.9°C
What is the empirical formula of a compound containing 90 grams carbon, 11 grams hydrogen, and 35 grams nitrogen? (5 points)
Question 3 options:
1)
C3H4N
2)
C2H4N
3)
C4H10N
4)
C2H5N
Answer:
1) C₃H₄N
Explanation:
The empirical formula of a compound is the formula that gives the positive integer ratio of the atoms of the elements in the compound in the simplest form
The mass of carbon in the compound = 90 grams
The molar mass of carbon = 12.011 g/mol
The number of moles of carbon = 90 g/(12.011 g/mol) ≈ 7.4931313 moles
The mass of hydrogen in the compound = 11 grams
The molar mass of hydrogen = 1.00794 g/mol
The number of moles of carbon = 11 g/(1.00794 g/mol) ≈ 10.913348 moles
The mass of nitrogen in the compound = 35 grams
The molar mass of nitrogen = 14.0067 g/mol
The number of moles of carbon = 35 g/(14.0067 g/mol) ≈ 2.49880414 moles
Dividing by the smallest mole ratio gives;
The proportion of carbon, C = 7.4931313/2.49880414 = 2.9987 ≈ 3
The proportion of nitrogen, N = 10.913348 /2.49880414 = 4.367 ≈ 4
The proportion of nitrogen, N = 2.49880414 /2.49880414 = 1
Therefore, the empirical formula of the compound is C₃H₄N.
Answer:
1) C₃H₄N
Explanation:
took test
Most types of commercial flour are sifted
before they are packaged and sold in the
store. What effect do you think this has
on the quality of the flour?
Answer:
It improves the texture of the flour
Explanation:
Flour is supposed to have a very fine texture. Commercial flour is not expected to occur in lumps. Lumps reduce the utility of the flour.
Hence, to improve the texture of the commercial flour, it is thoroughly sifted to ensure that there are no large lumps in the flour.This is so important when producing cake flour where the achievement of fine texture is of utmost priority.
Explain the volume of ideal gasses as related to the molar concept.
Answer:
n = Initial volume/22.4L
Explanation:
The molar concept is simply one that is used to find the Number of moles and explain the relationship it has with avogadro's number, molecular mass, molar mass e.t.c.
Now, in terms of molar mass, number of moles is given by the formula;
n = mass of the sample/molar mass
In terms of avogadro's number, number of moles is;
1 mole = avogadro's number = 6.02 × 10^(23)
Now, when dealing with ideal gases, the molar volume of an ideal gas is 22.4 L.
Now the relationship between this volume and the mole concept is that the number of moles is gotten by dividing the initial volume by this molar volume.
Thus;
n = Initial volume/22.4L
Select the correct mass for each of the samples described below.
3.01 × 1023 molecules H2O
Answer:
9.00 g H2O
Explanation:
Convert molecules to grams using stoichiometry
(3.01 * 10^23 molecules) * (1 mole H2O / 6.022 * 10^23 molecules) * (18.01 g / 1 mole H2O) = 9.00 g H2O
Answer:
answer in picture
Explanation:
24.
What is the molar mass of CO2?
Answer:
The molecular mass of carbon dioxide is 44.01amu
A substance conducts electricity because of free moving, charged particles.
What are the free moving, charged particles in a:
• carbon electrode (made from graphite)
• molten mixture of aluminium oxide and cryolite
• metal wire?
Answer:
105Comprendes las leyes de la electricidadAprende másClasificación de los materialesUn medio o material que permite el movimiento de las cargas eléctricas (electrones) en respuesta a una fuerza eléctrica, se denomina conductor. Los materiales conductores son los que se pueden electrizar en toda su superficie, debido a que los electrones se mueven libremente. Los metales por lo general son buenos conductores de la electricidad.El flujo de las partículas cargadas es lo que se conoce como corriente eléctrica. Las partículas cargadas en una cierta dirección de un conductor chocan con los átomos, produciendo una pérdida de energía que se manifiesta en forma de calor.Una medida de oposición que presentan las partículas cargadas al moverse libre-mente en una cierta dirección de un material conductor es lo que se conoce como resistencia eléctrica.Los materiales que no permiten que las partículas cargadas se muevan hacia otra región del material a una fuerza eléctrica, son llamados aislantespor ejemplo, la madera.Existen otros tipos de materiales cuyas propiedades son intermedias entre los conductores y aislantes; se llaman semiconductores.Algunos ejemplos de materiales con estas características son:
Explanation:
Can someone help me with these??
Answer: let me see I gotta do the work first then I’ll give you the answers
Explanation:
What volume of NaOH(aq) would be needed to reach the equivalence point if the concentration of the added base were 0.290 M?
Answer:
17.2mL are needed
Explanation:
The pH curve for titration of 50.0 mL of a 0.100 M solution of hydrochloric acid
A strong acid as HCl reacts with a strong base as NaOH producing water and a salt. The chemical equation is:
HCl + NaOH → H₂O + NaCl
Where 1 mole of HCl reacts per mole of NaOH
To solve this question we must find the moles of HCl added = Moles NaOH you must add to reach the equivalence point. With these moles and the molar concentration we can find the volume that would be needed as follows:
Moles HCl:
50.0mL = 0.0500L * (0.100moles / L) = 0.00500 moles HCl = Moles NaOH
Volume NaOH:
0.00500 moles NaOH * (1L / 0.290moles) = 0.0172L NaOH =
17.2mL are neededhow does the behavior of the particles determine the properties of the state of matter?
Answer:
Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. ... Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.\
Answer:
if they are more stable and more still they are solid if they are slitly agitated and move around more then it's a liquid but if they are completely moving fast without any hesitation then it's a gas.