Just connect an ammeter with circuit.
If ammeter shows reading then current flows.If no reading is shown current doesn't flow.Propane molecular formula?
Answer:
The propane chemical structure, or chemical formula, is three carbon atoms branched with eight hydrogen atoms I.e C3H8
What are the correct coefficients in order for the equation to be balanced?
A chemical reaction yields 3 moles of lithium hydroxide (LiOH).
How many grams of lithium hydroxide are present?
3 g
24 g
48 g
72 g
Answer:
The mass of 1 mole LiOH has been 24 g. Thus, option D is correct.
The mass of a compound present in a mole of sample has been equivalent to the molar mass of the compound. The molar mass of the compound has been the sum of the constituent in a formula unit.
Explanation:
pls mark brainless i mean brainliest!
Answer: 24 g
Explanation:
B 2. Meena is at the seaside and drops a message in a bottle into the sea. Explain why the bottle floats and will not sink.
HCl(aq) + ZnS (s) →
Express your answer as a chemical equation. Identify all of the phases in your answer.
If 70.0g of manganese (IV) fluoride reacts with 70.0g ammonium sulfide, which reactant is
the limiting reactant and how many grams of the excess reactant is left over?
MnF_4(aq)+2(NH_4)_2S(aq)-> MnS_2(s)+4NH_4F(aq)
The limiting reactant would be the ammonium sulfide and the amount of the excess manganese (IV) fluoride would be 1.96 grams
Limiting reactantsFrom the equation of the reaction:
[tex]MnF_4(aq)+2(NH_4)_2S(aq)- > MnS_2(s)+4NH_4F(aq)[/tex]
The mole ratio of [tex]MnF_4[/tex] to [tex](NH_4)_2S[/tex] is 1:2
Mole of 70 g [tex]MnF_4[/tex] = 70/130.93
= 0.53 moles
Mole of 70 g [tex](NH_4)_2S[/tex] = 70/68.154
= 1.03 moles
Equivalent mole of [tex](NH_4)_2S[/tex] = 0.53 x 2
= 1.06 moles
Thus, [tex](NH_4)_2S[/tex] seems to be limiting while [tex]MnF_4[/tex] is in excess.
Excess [tex]MnF_4[/tex] = 0.53 - 1.03/2
= 0.015 mole
Mass of 0.015 mole [tex]MnF_4[/tex] = 0.015 x 130.93
= 1.96 grams
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What is a mass number (A)?
Answer:
The mass number in a nucleus is the combined number of protons and neutrons, so it's protons and neutrons, and A symbolizes it. So A is the number of masses, which is equal to the number of protons, that is the number of atoms that we symbolized by Z, plus the number of neutrons.
The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.
7. Radial probability distributions for the 4s orbital of hydrogen has _______ peak(s). a. 0 b. 1 c. 2 d. 3 e. 4
Answer:
3
Explanation:
That's the answer
I hope it helps
What is the average speed (actually the root-mean-square speed) of a neon atom at 27°C?
Answer:
432m/s
Explanation:
The rms speed (u) is related to the temperature (T) and molecular weight (M) by the expression
u=
M
3RT
u=
40×10
−3
kg/mol
3×8.314J/molK×(27+273.15)K
u=432.2m/s
Hence, the rms speed is 432.2 m/s
hope this is helpful
It's 32°F (0°C) outside under normal atmospheric conditions (1 atm) at a stunt
a
performer's birthday party. There is a huge blue balloon filled with flammable hydrogen
(H2, molar mass = 2.02 g/mol) gas that she plans to safely ignite, causing a massive
explosion. Inside the balloon is 239 g of H2(g).
What is the volume of the balloon, in liters? Round to the nearest whole number.
The volume of the balloon is approximately 2652 liters.
How to determine the volume occupied by the gas in a balloonLet suppose that flammable hydrogen behaves ideally. GIven the molar mass ([tex]M[/tex]), in kilograms per kilomole, and mass of the gas ([tex]m[/tex]), in kilograms. The volume occupied by the gas ([tex]V[/tex]), in cubic centimeters, is found by the equation of state for ideal gases:
[tex]V = \frac{m\cdot R_{u}\cdot T}{P\cdot M}[/tex] (1)
Where:
[tex]R_{u}[/tex] - Ideal gas constant, in kilopascal-cubic meters per kilomole-Kelvin.[tex]T[/tex] - Temperature, in Kelvin[tex]P[/tex] - Pressure, in kilopascalsIf we know that [tex]m = 0.239\,kg[/tex], [tex]R_{u} = 8.314\,\frac{kPa\cdot m^{3}}{kmol\cdot K}[/tex], [tex]T = 273.15\,K[/tex], [tex]P = 101.325\,kPa[/tex] and [tex]M = 2.02\,\frac{kg}{kmol}[/tex], then the volume of the balloon is:
[tex]V = \frac{(0.239\,kg)\cdot \left(8.314\,\frac{kPa\cdot m^{3}}{kmol\cdot K} \right)\cdot (273.15\,K)}{\left(101.325\,kPa\right)\cdot \left(2.02\,\frac{kg}{kmol} \right)}[/tex]
[tex]V = 2.652\,m^{3}[/tex] ([tex]2652\,L[/tex])
The volume of the balloon is approximately 2652 liters. [tex]\blacksquare[/tex]
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Why The background of images seemed not same?
Answer:which pictures?
Explanation:show the pictures first
answer: time
Explanation:
well the clouds are moving and the time is different or the seasons also make the background different
How do scientists know how reconstruct a fossil?
Scientists will use the structure of existing animal as a model.
Each fossil piece fits together perfectly.
There are labels found in each of the fossil bones.
The location of each fragment found provides clues on how the animal looks.
A, Scientists will use the structure of existing animals as a model :)
Answer:
Scientists will use the structure of existing animal as a model.
Explanation:
-lukelaws
please mark me brainliest I need one more please!!!
4. What are the correct coefficients in order for the equation to be balanced?
Answer:
Li: 2
H2O: 2
LiOH: 2
H2: 1
Explanation:
Good luck
Which type of molecule is acetone?
A. Amine
B. Ketone
C. Alcohol
D. Aldehyde
Answer: B. Ketone
Explanation: Another name for acetone is propanone, and it is the main ketone as it has the functional group in the middle, a CH3 on each side. Ketones have the C=O functional group.
2. A closed system contains 2g of ice. Another 2g of ice are added to the system. What is the final
mass of the system?
Answer:
4
Explanation:
2+2=4
If the phosphorus is present as phosphate ion (PO43-), how many moles of PO43- are present in 5.00 g of the 15-30-15 fertilizer?
How many moles are in 239 g of iron? Express your answer to three significant figures.
Carefully thinking about your choices and their consequences before making a decision shows _____.
Answer:
Decision making
Explanation:
A person who thinks before choosing is a person who makes decisions.
________ is a type of root system.
Stemroot system
Taproot system
Leaf root system
Seedling root system
Earth's rotation causes the Coriolis effect. What impact does the Coriolis effect have on global winds?
Answer:
The Earth's rotation means that we experience an apparent force known as the Coriolis force. This deflects the direction of the wind to the right in the northern hemisphere and to the left in the southern hemisphere.
Explanation:
Movement of Ocean water
Choose ALL that apply
A. none of the choices
B. Surface water at the poles is dense because of low temperatures and high salinity.
C. Differences in the density of seawater cause it to move.
D. This water sinks and moves toward the equator where it replaces less dense, warm water.
Answer:
I would go with
B. Surface water at the poles is dense because of low temperatures and high salinity.
i could be wrong tho.
Explanation:
. Why do you think bases are often described as the “opposites” of acids?
they simply don't have the same characteristics
Explanation:
An acid produces a hydroxonium ion as positive which is part of the reason why they are corrosive
Bases are less corrosive which is why they can neutralize an acid to give salt and water
Which of the following statements is true?
A. Energy can be created, but not destroyed.
B. Some machines are 100 percent efficient.
C. Atomic energy can't be converted into electricity.
D. When work is done, some energy is always "lost" as heat.
Answer:
D
Explanation:
Heat sometimes gets "lost" when work is done
Task: Study the pictures above, Write at least five differences of active and inactive volcano based on the picture you've seen and observed above.
Answer:
Explanation:
1. There are fire and flashes at the top of an active volcano. No fire nor flashes for inactive volcano.
2. Smoke and debris come off an active volcano. No smoke nor debris from inactive volcano.
3. Magma flows from top of active volcano. No magma from inactive volcano.
4. There can be snow on top of inactive volcano. Active volcano is too hot for that.
5. There are plants and other wild lives around an inactive volcano.
Why critical thinking is important especially for chemists?
Answer:
Because chemists need to think outside the box for what they do, in other words, "science is not always black and white" which means science has color to it or many different aspects some of those which are not yet discovered and needs critical thinking chemists to figure out and discover.
Explanation:
(this was all in my own words and not actually cut and Paiste ○|￣|_ =3)
How many moles of H20 are contained in 4.21 x 1024 molecules of H2O?
O A 2.53 x 1048 moles
OB. 2.34 x 1023 moles
C. 6.99 moles
OD. 0.143 moles
Answer:
C. 6.99 moles
Explanation:
To convert molecules to moles we simply divide the given number of molecules by Avogadro's number, 6.022 x 10²³
Given number of molecules : 4.21 x 10^24
Number of moles : 4.21 x 10^24 / 6.022 x 10²³ = 6.99 moles ( rounded )
The answer is C
Formation of Ionic bond
1. formation of Potassium Sulphide.
Answer:
It can be produced by heating K2SO4 with carbon (coke): K2SO4 + 4 C → K2S + 4 CO. In the laboratory, pure K2S may be prepared by the reaction of potassium and sulfur in anhydrous ammonia.
1. A sample of methane gas collected at a pressure of 1.28 atm and a temperature of 29.0 degrees Celsius is found to occupy a volume of 27.6 liters. How many moles of CH4CH4 gas are in thesample?
Moles be n
[tex]\\ \rm\Rrightarrow PV=nRT[/tex]
[tex]\\ \rm\Rrightarrow n=\dfrac{PV}{RT}[/tex]
[tex]\\ \rm\Rrightarrow n=\dfrac{1.28(27.6)}{0.0821(302)}[/tex]
[tex]\\ \rm\Rrightarrow n=\dfrac{35.3}{24.8}[/tex]
[tex]\\ \rm\Rrightarrow n=1.42mol[/tex]
The number of moles of methane gas occupies in the given volume and pressure is 1.426 moles. It can be calculated using ideal gas law.
What is ideal gas law?Ideal gas law relates the parameters temperature, pressure, volume and number of moles of a gas by the equation given below:
PV = nRT.
Where, R is the universal gas constant equal to 0.082 L atm /(K .mol). This law is a combination of Boyle's law, Charles's law and Avogadro's law.
It is given that the pressure and volume of the gas is 1.28 atm and 27.6 liter respectively. Temperature is 29 degree celsius or 302 kelvin. Using these values the number of moles of methane gas is calculated as follows:
PV = nRT
n = PV/RT
Number of moles of methane n = (1.28 atm × 27.6 L) / ( 0.082 L atm /(K .mol) × 302 K )
= 1.426 moles.
Hence, the number of moles of methane gas in the given system is 1.426 moles.
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What is an indicator?
Hope it helps you!!
how many molecules are in 90g of agno3
Answer:
0.5298072502356179
Explanation: