An atom starts with 20 electrons and 20 protons; after a reaction, it has 18 electrons and 20 protons.
Answer:
(+20) + (-18) = +2
Explanation:
find the empirical formula for
42.05g of nitrogen, 95.95 of oxygen
and
7.33g of lanthanum, 2.96g of oxygen
Answer:
[tex]NO_2[/tex] and [tex]La_2O_7[/tex]
Explanation:
Nitrogen:
[tex]\frac{42.05}{14}=3[/tex]
Oxygen:
[tex]\frac{95.95}{16}=6[/tex]
Ratio:
[tex]3:6=1:2[/tex]
So empirical formula becomes [tex]NO_2[/tex]
-----
Lanthanum:
[tex]\frac{7.33}{139}=0.0527[/tex]
Oxygen:
[tex]\frac{2.96}{16}=0.185[/tex]
Ratio:
[tex]0.0527:0.185=1:3.5=2:7[/tex]
So empirical formula becomes [tex]La_2O_7[/tex]
What is the empirical formula for H2SO4? Explain.
Answer: The empirical formula is H2SO4 only.
Explanation: Because it is the simplest ratio of atoms of elements in a compound.
Use this equation to calculate the specific heat capacity of each metal:
cmetal =
c water = sp. heat capacity of water (4.18 J/gC)
m water = mass of the water in the cup
T water = change in water temperature
m metal = mass of the metal
T metal = change in metal temperature
What is the specific heat for the aluminum wire?
What is the specific heat for the steel wire?
What is the specific heat for the lead pellets?
Answer:
What is the specific heat for the aluminum wire?
0.82
What is the specific heat for the steel wire?
0.47
What is the specific heat for the lead pellets?
0.25
Explanation:
Answer:
What is the specific heat for the aluminum wire?
0.82
What is the specific heat for the steel wire?
0.47
What is the specific heat for the lead pellets?
0.25
Explanation:
This is the person above me. All credits go to them.
A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?
OV
Na
Mg
Se
Save and Frit
Answer:
Na
Explanation:
Sodium
What is a limitation for using solar energy to meet global energy needs?
Answer:
The sun provides more than enough energy to meet the whole world's energy needs, and unlike fossil fuels, it won't run out anytime soon. As a renewable energy source, the only limitation of solar power is our ability to turn it into electricity in an efficient and cost-effective way.
The following diagram on the left represents the copper nitrate solution in the half‑cell before the galvanic cell starts to operate. In the following diagram on the right, draw a representation of the solution in the same half‑cell after the galvanic cell has been operating for some time and is still producing a voltage.
Before reaction : 4 Cu2+ molecules and 8NO3-
Answer:
There is too much here for me to attempt in one sitting, but I will get you started and give suggestions that may help you proceed on your own.
a) As far as I can tell, you didn't provide the reduction potentials in the table below. So, I looked them up and find them to be
Cu2+ +2e- ==> Cu(s) Eº = +0.34 V
Zn2+ + 2e- ==> Zn(s) Eº = -0.76 V
Net ionic equation: Cu2+(aq) + Zn(s) ==> Cu(s) + Zn2+(aq)
b) Eºcell = 0.34 V + 0.76 V = 1.10 V
c) ∆Gº = -nFEº where n = number of electrons transferred (2) and F = 96,485 C/mol e- and Eº = 1.1 V
d) Again, there is no diagram
e) same
f) Use the Nernst equation Ecell = Eºcell - 2.303RT/nF log Q where R = 8.314; T = Kelvin; F = Faraday const. and Q = reaction quotient, i.e. products/reactants
g) the cell voltage is an intensive property. That should help you answer this part of the question
Explanation:
its not much but i hoped this helped
What is the definition of molar volume?
Answer:
Occupied volume divided by the amount of a substance at a given pressure and temperature
Explanation:
Source: wikipedia
(iii) Explain the following statements about drugs:
a. You can be arrested by the police for possessing heroin
b.All drugs are dangerous.
Answer:
A
Explanation:
Heroine destroying the body system
Describe the kinds of potential energy that are stored by a car driving on a hill.
Answer:
The internal combustion engine in the car converts the potential chemical energy in gasoline and oxygen into thermal energy which is transformed into the mechanical energy that accelerates the vehicle (increasing its kinetic energy) by causing the pressure and performing the work on the pistons.
Explanation:
A helium balloon with a volume of 5.0 L and a pressure of 105 kPa at 25°C floats up high in the sky where the pressure is 850 mm Hg and the temperature is -15°C. What is the new volume of the balloon?
Answer:
volume 2- 4.011 L
Orbital structure of sodium?
Answer:
na.
sodium
11( 2,81,)
pls Mark me as brainlest
Carlotta notices that the words of a book are blurry, but a sign across the road is not. What might correct Carlotta’s vision?
a diverging lens, to fix her farsightedness
a diverging lens, to fix her nearsightedness
a converging lens, to fix her farsightedness
a converging lens, to fix her nearsightedness
hurry plz
Answer:
C.
Explanation:
what is the only thing that stops gamma rays?
The Answer is LEAD ......................
How many moles of oxygen are required to react with 12 moles of FeS2?
4FeS2 + 11O2 → 2Fe2O3 + 8SO2
Identify the correct coefificients to balance it
-C3H8+O2 to -CO2 +-H2O
Answer:
[tex]{\rm 1\; C_3H_8} + {\rm 5\; O_2} \to {3\; \rm CO_2} + {4\; \rm H_2O}[/tex].
Explanation:
[tex]{\rm ?\; C_3H_8} + {\rm ?\; O_2} \to {?\; \rm CO_2} + {?\; \rm H_2O}[/tex].
Among the four species in this reaction, [tex]\rm C_3H_8[/tex] is species with the largest number of atoms per molecule. Assume that the coefficient of this compound is [tex]1[/tex].
[tex]{\rm 1\; C_3H_8} + {\rm ?\; O_2} \to {?\; \rm CO_2} + {?\; \rm H_2O}[/tex].
Number of atoms on the left-hand side of the reaction:
[tex]\rm C[/tex]: [tex]1 \times 3 = 3[/tex].[tex]\rm H[/tex]: [tex]1 \times 8 = 8[/tex].[tex]\rm O[/tex]: not found yet.By the conservation of atoms, the number of atoms on the right-hand side of the reaction should match those on the left-hand side. In this reaction, [tex]\rm CO_2[/tex] is the only product with carbon atoms, whereas [tex]\rm H_2O[/tex] is the only product with hydrogen atoms. These [tex]3[/tex] carbon atoms and [tex]8[/tex] hydrogen atoms would correspond to:
[tex]3 / 1 = 3[/tex] [tex]\rm CO_2[/tex] molecules, and[tex]8 / 2 = 4[/tex] [tex]\rm H_2O[/tex] molecules.[tex]{\rm 1\; C_3H_8} + {\rm ?\; O_2} \to {3\; \rm CO_2} + {4\; \rm H_2O}[/tex].
Number of atoms on the right-hand side of the reaction:
[tex]\rm C[/tex]: [tex]3 \times 1 = 3[/tex].[tex]\rm H[/tex]: [tex]4 \times 2 = 8[/tex].[tex]\rm O[/tex]: [tex]3 \times 2 + 4 \times 1 = 10[/tex].The number of [tex]\rm O[/tex] atoms on the left-hand side should match those on the right-hand side. In this reaction, [tex]\rm O_2[/tex] is the only reactant with [tex]\rm O\![/tex] atoms. These [tex]10[/tex] [tex]\rm \! O[/tex] atoms would correspond to:
[tex]5[/tex] [tex]\rm O_2[/tex] molecules.[tex]{\rm 1\; C_3H_8} + {\rm 5\; O_2} \to {3\; \rm CO_2} + {4\; \rm H_2O}[/tex].
How is evaporation related to molarity?
Answer:
Molarity is the amount (in mole) of solute in a solvent. If the solute is very volatile, then it will evaporated from the solution as temperature rising. So the amount of solute is decreasing, causing the molarity decreasing. If the solvent itself volatile, then the molarity will increase.
(Looked up the answer for you)
The relationship between evaporation and molarity is; the rate of evaporation of will decrease as the molarity increases
What is evaporation and molarity?
Molarity (M) is defined as the amount of a substance in a certain volume of solution. Molarity can also be defined as the number of moles of a solute per liters of a solution.
Now, the rate of evaporation of will decrease as the solute concentration increases due to the fact that for the same surface area for evaporation, as the concentration of the solute increases, less water molecules will get exposed to escape from the water surface.
Read more about Evaporation and Molarity at; https://brainly.com/question/14718840
What is the total number of grams of HI in 0.500 liter of
1.00 M HI?
64.0 g
128 g
1.00 g
0.500 g
Answer:
The amount of HI is "64 grams".
Explanation:
The given values are:
Volume,
= 0.500 L
Molarity,
= 1.00 H
Molar mass of HI,
= 128
Now,
The moles of HI will be:
= [tex]Molarity\times Volume[/tex]
On substituting the values, we get
= [tex]1.00\times 0.500[/tex]
= [tex]0.5 \ mol[/tex]
hence,
The amount of HI will be:
= [tex]Moles\times Molar \ mass[/tex]
= [tex]0.5\times 128[/tex]
= [tex]64 \ grams[/tex]
What about 50 g of water?
I need help what this
Answer:
3.38 Tablespoons
10.14 Teaspoons
0.21 U.S. Cups
0.18 Imperial Cups
0.20 Metric Cups
50.00 Milliliters
Explanation:
The probability?????????????????
where is the magnitude of force of magnetism the greatest
Answer:
The strength of the field varies depending on its location around the magnet. The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole.
Explanation:
The disinfectant hydrogen peroxide (H2O2)
decomposes to form water and oxygen gas.
How much O2 will result from the decomposition of 7.6 mol of hydrogen peroxide?
Answer in units of mol.
Answer: amount of O2 is 3.8 moles
Explanation: reaction. 2 H2O2 -> 2 H2O + O2
Two moles H2O2. Produces one ole Oxygen
Now balance the chemical reaction by providing the correct coefficients:
carbon + fluorine gas yields
carbon tetrafluoride
[?] C+[?]F2 → [?]CF4
Identify Acid, Base, Conjugate acid, and base pairs in the following: HPO2 + NH" -> H-PO, + NH, Conjugate Acid ,HPO 2 Acid NH, ΝΗ, Base H PO Conjugate Base I need answers now
Answer:
no ablo inglés porfavor amigos
3. Two liquids are being studied to find which one
evaporates more quickly. Liquid A boils at 50°C and
Liquid B boils at 25°C. Which liquid do you think
evaporates faster?
A.Liquid A
B.Liquid B
C.Both will evaporate at the same rate
D.Neither evaporate at all
Answer: D
Explanation:
Because at temerature at 25 and 50 is
to low for a compound to evaporate as gas because the bioling point is 100.
Answer: B
Explanation: Evaporation rate is influenced by the liquid's boiling temperature. A lower boilng point means that converting the liquid to a gas takes less energy because higher temperatures mean higher energy content. Assuming that this relationship holds at room temperature and that all other factors are equal, you should expect that Liquid B will evaporate faster.
6.
Increasing light
This type of response is a main function of the -
A.
excretory system.
B.
circulatory system.
C.
endocrine system.
D
nervous system.
Answer: d: nervous system
Explanation:
When focused light is projected onto the retina, it stimulates the rods and cones. The retina then sends nerve signals are sent through the back of the eye to the optic nerve. The optic nerve carries these signals to the brain, which interprets them as visual images.
Does anyone know the simplest way to find the rate constant in rate law chemistry?
Answer:no I don’t sorry
Explanation:
Consider the reaction:
120 (9) + 5 CO(g) -------> 5 CO2(g) +
1,(g)
0.315 moles of iodine(V) oxide, 105, reacts
with 1.00 moles of carbon monoxide, CO.
Determine the moles of le, which could
be produced?
Answer:
SOMEONE ANSWER THIS PLEASE
Explanation:
PLEASE
When a mixture of iron powder and sulphur is heated it glows more brightly than that of iron filings and sulphur.Explain this observation
Answer:
I don't know
Explanation:
mixture of iron powder and sulphur heated it glows because sulphur and iron are more reactive metals that they shine and sulphur can react with water produce fire it's write
From the balanced reaction below, when you have 3.33 moles of (NH4)2Cr2O7, how many grams of N2 will be produced
Answer:
[tex]m_{N_2}=93.3gN_2[/tex]
Explanation:
Hello there!
In this case, for this stoichiometry-based problem, it is firstly necessary to realize that the decomposition of ammonium dichromate is given by:
[tex](NH_4)_2Cr_2O_7(s)\rightarrow N_2(g)+4H_2O(l)+Cr_2O_3(s)[/tex]
Thus, since the mole ratio between ammonium dichromate and the gaseous nitrogen (molar mass = 28.02 g/mol) is 1:1, we can compute the produced mass of the latter via stoichiometry as shown below:
[tex]m_{N_2}=3.33mol(NH_4)_2Cr_2O_7*\frac{1molN_2}{1mol(NH_4)_2Cr_2O_7}*\frac{28.01gN_2}{1molN_2}\\\\ m_{N_2}=93.3gN_2[/tex]
Best regards!