Answer:
SiH4
Explanation:
We must remember that the magnitude of intermolecular forces play a vital role in the determination of the boiling point of a substance.
The Si-H bond is the least polar among all the bonds in compounds listed in the question. This is because the electronegativity difference between silicon and hydrogen is very slim resulting in the formation of a nonpolar covalent bond.
The other compounds possess more polar bonds hence have a greater degree of dipole interaction between molecules and a consequently higher boiling point than SiH4.
What is the mass of 20 moles of fluorine?
Answer:
380g
Explanation:
Given parameters:
Number of moles of Fluorine = 20moles
Unknown:
Mass of Fluorine = ?
Solution:
The number of moles is the unit of quantifying the amount of particles in a substance.
So;
Mass of a substance = number of moles x molar mass
Molar mass of F = 19g/mol
Now;
Mass of F = 20 x 19 = 380g
What is increasing the amount of Co2 in the atmosphere?
Answer:
Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.Aug 14, 2020
Explanation:
Calculate the standard free energy for the following reaction at 25°C.
Zn (s) + 2Ag (aq) --------> Zn2 (aq) 2Ag (s)
The
represents the location of the electrons.
Answer:
just look it up
:
The volume of a scuba tank is 10.0 L. It contains a mixture of nitrogen and oxygen at 290.0 atm.
What volume of this mixture could the tank supply to a diver at 2.40 atm?
Write out the answer
Answer:
each gas in the mixture add to give the total pressure (Ptot = P1 + P2 + P3 + ...) 1. ... After mixing, there will be the same number of moles of each gas, at the same T, just in a different volume. .OOL ... Pe=1697 atm P = 174_ atm. (1.000. ... Oxygen is pumped into a tank to supply breathing air for scuba diving, until the gas
Explanation:
The volume of the mixture will be "1208.33 L". A further solution is provided below.
The given values are:
Volume of scuba tank,
V₁ = 10 LPressure,
P₁ = 290 atmP₂ = 2.40 atmAccording to the Boyle's Law,
→ [tex]P_1V_1=P_2V_2[/tex]
or,
→ [tex]V_2=\frac{P_1V_1}{P_2}[/tex]
By putting the given values, we get
→ [tex]=\frac{290\times 10}{2.40}[/tex]
→ [tex]= \frac{2900}{2.40}[/tex]
→ [tex]= 1208.33 \ L[/tex]
Thus the above answer is correct.
Learn more about volume of mixture here:
https://brainly.com/question/3841593
The chemical formula for calcium hydroxide is: Calculate the molar mass of calcium hydroxide. Round your answer to decimal places.
Answer:
Chemical Formula = Ca(OH)₂
Molar Mass = 74.09 g/mol
Explanation:
The chemical formula for calcium hydroxide is: Ca(OH)₂. We can know that because the calcium ion always has a +2 charge, while the hydroxide ion has a -1 charge.
We calculate the molar mass by adding together the atomic masses of each atom that makes the compound (these can be found in a periodic table):
Molar Mass = Atomic Mass Ca + (Atomic Mass O)*2 + (Atomic Mass H)*2
Molar Mass = 40.078 + (15.999)*2 + (1.007)*2
Molar Mass = 74.09 g/mol
in general, ionic compounds have
9. The picture below shows the parts of an electric motor.
What Is the object in the middle with a coll of wire wrapped around a metal shaft?
O An electromagnet that spins when pushed by magnets.
O An electromagnet that spins when solar energy is converted to mechanical energy.
O A generator which makes the electricity.
OA generator which spins when electricity Is connected to the motor.
Answer:
A generator which spins when electricity Is connected to the motor.
The part or electric motor marked in the given image is called an armature. It is an electromagnet that spins when its is pushed by the magnets either side. Hence, option b is correct.
What is an electric motor?An electric motor is a device which converts electrical energy to mechanical energy. The majority of electric motors operate by generating force in the form of torque imparted to the motor shaft through the interplay of the magnetic field of the motor and electric current in a wire winding.
Although an electric generator and an electric motor are technically equivalent, an electric generator uses a reversed power flow to transform mechanical energy into electrical energy.
Electric motors can be powered by alternating current (AC) sources like a power grid, inverters, or electrical generators or by direct current (DC) sources like batteries or rectifiers.
To find more on electric motors, refer here:
https://brainly.com/question/15409160
#SPJ2
What is an amu?
Will give Brainliest!
Answer: Amu is an atomic mass unit.
At the end we stopped the distillation with some material left in the vial. Why is it considered unsafe to distill until dryness?
Answer:
See the answer below
Explanation:
Distillation is a process of separating the contents of a liquid mixture by making use of the difference in the boiling temperatures of the components of the mixture. As the boiling point of each component is reached, it evaporates off and the vapor is condensed and collected to give a pure product.
It is never advisable to distillate to dryness because allowing the content of the distilling flask to dry up can cause heat to damage the flask or in some extreme cases, cause unintended chemical reactions that might alter the outcome of the experiment or cause laboratory accident.
The standard cell potential (E° cell) of the reaction below is +1.34 V. The value of ΔG° for the reaction is kJ/mol.
3Cu(s)+2MnO−4(aq)+8H+(aq)→3Cu2+(aq)+2MnO2(s)+4H2O(l)
The standard cell potential (E cell) of the reaction below is +1.34 V. The value of G° for the reaction is kJ/mol.
3Cu(s)+2MnO−4(aq)+8H+(aq)→3Cu2+(aq)+2MnO2(s)+4H2O(l)
a. -776
b. +259
c. -24.3
d. +776
e. -259
Answer:
-776 KJ/mol
Explanation:
We must look towards the balanced reaction equation in order to obtain the number of electrons transferred in the redox reaction.
3Cu(s) + 2MnO4^-(aq) + 8H^+(aq)------>3Cu2+(aq) + 2MnO2(s) + 4H2O(l)
We can easily see that copper lost six electrons while Manganese gained six electrons hence n=6
ΔG =-nFEcell
Where;
n= 6
F = 96500 C
Ecell=+1.34
ΔG = -(6 * 96500 * 1.34)
ΔG = -776 KJ/mol
How many moles are there in 8.5x 10^25 molecules of co2
Answer:
trrgtsehghrdy
Explanation:
Molar mass of CO2 = 44g/mol
1.5
⋅
10
25
6.023
⋅
10
23
= 51.5 moles of CO2
51.5
⋅
44g/mol
=
2266
g
r
a
m
s
Hope this helped
what leads to the formation of a wind chill factor
Answer:
What leads to the formation of a wind chill factor? A change in the air temperature creates air pressure differences in the atmosphere
Explanation:
hope this helps :)
Which is a property of potassium (K)? O A. It is dull and brittle. O B. It is not reactive. O C. It is white and hard. O D. It is extremely reactive.
Answer:
D. It is extremely reactive.
Explanation:
Potassium has atomic number of 19 and belongs to the group 1 elements.
A. It is dull and brittle
This is not true as potassium is a metal with a silver lustre.
B. It is not reactive
This is false. Because it is a group 1 element, it would readily lose it's electron to achieve octet configuration making it a reactive metal.
C. It is white and hard.
Potassium is a white metal, however it is not hard. Rather it is soft.
D. It is extremely reactive.
This is correct. Because it is a group 1 element, it would readily lose it's electron to achieve octet configuration making it a reactive metal.
..A 1.00 L balloon is filled with helium at 1.20 atm. If the balloon is squeezed into a 0.500 L
beaker and doesn't burst, what is the pressure of the helium?
Write out the answer
Answer:
P₂ = 2.4 atm
Explanation:
Given data:
Initial volume = 1.00 L
Initial pressure = 1.20 atm
Final volume = 0.500 L
Final pressure = ?
Solution:
The given problem will be solved through the Boyle's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
1.20 atm × 1.00 L = P₂ × 0.500 L
P₂ = 1.20 atm. L /0.500 L
P₂ = 2.4 atm
a 22.44g sample of iron absorbs 180.8 J of heat, upon which the temperature of the sample increases from 21.1C to 39.0/ what is the specific heat of iron
Answer:
The specific heat of iron is 0.45 J/g.°C
Explanation:
The amount of heat absorbed by the metal is given by:
heat = m x Sh x ΔT
From the data, we have:
heat = 180.8 J
mass = m = 22.44 g
ΔT = Final temperature - Initial temperature = 39.0°C - 21.1 °C = 17.9°C
Thus, we calculate the specific heat of iron (Sh) as follows:
Sh = heat/(m x ΔT) = (180.8 J)/(22.44 g x 17.9°C) = 0.45 J/g.°C
Which best illustrates the way in which radiation transfers thermal energy
Warm
Warm
Cool
3
( Warm
Cool
Warm
Cool
Warm
Cooi
the answer is:
b. warm ~~> cool
what is the molar mass of NH4NO3 to the nearest 1 decimal?
Answer:
80.1 g/mol
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableExplanation:
Step 1: Define
NH₄NO₃
Step 2: Identify Conversions
Molar Mass of N - 14.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of NH₄NO₃ - 2(14.01) + 4(1.01) + 3(16.00) = 80.06 g/mol
Step 3: Check
We want 1 sig fig. Follow sig fig rules and round.
80.06 g/mol ≈ 80.1 g/mol
Plutonium-236 is an alpha emitter with a half-life of 2.86 years. If a
sample initially contains 2.35mg of Pu-236, what mass of Pu-236 is
present after 10 years?
a. 0.228mg
b. 0.208mg
c.0.198mg
d. 0.188mg
Answer:
C
Explanation:
because its half life is shorter than the subsequent ones
During laparoscopic surgery, CO2 gas is used to expand the abdomen to help create a larger
working space. If the CO2 injected into the abdomen produces a pressure of 20.0 mmHg
and a volume of 4.00 L at 32.0C, how many grams of CO2 were used?
Answer:
The answer to your question is V2 = 4.97 l
Explanation:
Data
Volume 1 = V1 = 4.40 L Volume 2 =
Temperature 1 = T1 = 19°C Temperature 2 = T2 = 37°C
Pressure 1 = P1 = 783 mmHg Pressure 2 = 735 mmHg
Process
1.- Convert temperature to °K
T1 = 19 + 273 = 292°K
T2 = 37 + 273 = 310°K
2.- Use the combined gas law to solve this problem
P1V1/T1 = P2V2/T2
-Solve for V2
V2 = P1V1T2 / T1P2
-Substitution
V2 = (783 x 4.40 x 310) / (292 x 735)
-Simplification
V2 = 1068012 / 214620
-Result
V2 = 4.97 l
Acid rain is a dilute solution of acids that dissolve the calcium carbonate in limestone statues. Concentrated acids can dissolve a large piece of limestone in a few days. Statue breakdown due to acid rain can take decades, but statues with intricate carvings break down more quickly. Explain these observations in terms of reaction rates.
Answer:
See the answer below
Explanation:
A weak solution of acid would gradually dissolve the calcium carbonate in limestone statues. For example, dilute sulphuric acid formed from the dissolution of SO2 in rainwater would react with calcium carbonate according to the following equation;
[tex]H_2SO_4(aq)+CaCO_3(s)-->CaSO_4(s)+CO_2(g)+H_2O (l)[/tex]
Generally, the rate of any reaction depends on a host of factors such as temperature, pressure, presence of catalysts, and surface area of reactants. The higher the surface area of reactants, the higher the rate of reaction.
In this case, the rate of reaction of the dilute acid and the calcium carbonate depends on the surface area of the calcium carbonate which happens to be the only solid reactant. Statues with intricate carvings seem to break down more quickly than ordinary statues because they offer more surface area for reaction to take place. The intricate carvings create more surface area for reactions when compared to statues without intricate carvings.
Answer:
The time taken for the statue to break down depends on the reaction rate.
The low concentration of acids in acid rain reduces the reaction rate and increases the time required to break down the statue.
Intricate carvings increase the surface area of the statue and therefore increase the rate of the statue’s breakdown.
Explanation:
EDGE2021
Does a reaction occur when aqueous solutions of copper(II) sulfate and lead(II) nitrate are combined?
a) Yes
b) No
In my opinion yes but thats me
Why are nuclear reactions ideal to produce heat energy?
Nuclear reactors can easily be manufactured.
Nuclear reactors can produce large amount of heat energy.
Nuclear reactors can easily produce heat energy.
Nuclear reactors do not cost a lot of money to use.
Answer:
they can produce large amounts of heat energey
Explanation:
i had the same question hope it helps!!!
Which statements about sulfur difluoride are correct?
Select all the correct answers.
1) Each fluorine atom loses one electron to reach a noble gas configuration.
2) Each fluorine atom makes one bond.
3) The sulfur atom makes a total of two bonds.
4) The sulfur atom gains an electron to reach a noble gas configuration.
The correct statement about sulfur difluoride is; the sulfur atom makes a total of two bonds.
The molecule, SF2 consists of one sulphur atom and two fluorine atoms which are covalently bonded.
Each of the atoms in SF2 has attained the noble gas configuration. The sulphur atom forms a total of two bonds in SF2; one bond to each fluorine atom as shown in the image attached.
Learn more: https://brainly.com/question/10777799
Answer: Each fluorine atom makes one bond. and the 2nd is The sulfur atom makes a total of two bonds.
Explanation:
Which is the main type of element found in the upper right part of the periodic table? O A. Metals B. Representative metals O C. Nonmetals D. Metalloids
Answer: The main type of elements found in the upper right part of the periodic table are the Nonmetals. The correct option is C.
Explanation:
The Periodic table of elements describes the properties of elements which varies in regular manner. Some of these chemical properties includes:
--> Ionisation energy
--> Atomic radii
--> Ionic radii
--> Electron affinity
--> electronegativity
--> metallic Character
--> Atomic volume
It organizes known elements based on these chemical properties. From the features of a Periodic table of elements, they occur in;
--> GROUPS(when similar elements are the arranged in numbered columns). These groups are the alkali metals, alkaline earth metals, halogens and noble gases.
--> PERIODS( when arranged in numbered rows).
Every element can either be classified as a metal, nonmetal or semi metal. NONMETALS are poor conductors of heat and electricity. They are clustered in the upper right-hand corner of the periodic table.
Is the formal charge on N the same or different in these two species? Is the formal charge on the same or different in these two species?
a) The formal charge on N is 0 in both species.
b) The formal charge on N is 0 in HNO2 and +1 in NO2−.
c) The formal charge on N is +1 in HNO2 and 0 in NO2−.
d) The formal charge on N is +1 in both species.
Answer:
a) The formal charge on N is 0 in both species.
Explanation:
The formal charge is calculated using the formular;
FC = V-N-B/2
Where;
V = Number of Valence electrons
N = number of nonbonding valence electrons
B = total number of electrons shared in bonds
In NO2-;
The formal charge of N is given as;
FC = 5 - 2 - 6/2
FC = 0
In HNO2
The formal charge of N is given as;
FC = 0
The correct option is;
a) The formal charge on N is 0 in both species.
Can Someone please help?!?!!
Answer:
because the ice makes water bc ice turns into water hope it helps
Explanation:
Write a balanced molecular equation for the reaction between solid aluminum hydroxide and a solution of hydrobromic acid. Include the state of each species.
Answer:
Al(OH)₃(aq) + 3 HBr(aq) ⇒ AlBr₃(aq) + 3 H₂O(l)
Explanation:
Let's consider the unbalanced equation for the reaction between solid aluminum hydroxide and a solution of hydrobromic acid. This is a neutralization reaction so it forms a salt, aluminum bromide, and water.
Al(OH)₃(aq) + HBr(aq) ⇒ AlBr₃(aq) + H₂O(l)
We start balancing Br atoms by multiplying HBr by 3.
Al(OH)₃(aq) + 3 HBr(aq) ⇒ AlBr₃(aq) + H₂O(l)
To get the balanced equation, we must multiply H₂O by 3 as well.
Al(OH)₃(aq) + 3 HBr(aq) ⇒ AlBr₃(aq) + 3 H₂O(l)
please solve this ASAP thank you
for 20 points
Answer:
hi
Explanation:
what is mineral in science?
Answer:
minerals
Explanation:
defines a mineral as "a naturally occurring inorganic element or compound having an. orderly internal structure and characteristic chemical composition, crystal form, and physical. properties." Minerals differ from rocks, which are naturally occurring solids composed of one or more minerals.
