Answer:
Explanation:
From the work of Krogh in 1918 until the present time, a very wide range of values for oxygen diffusion coefficients has been reported1–5 ranging from 1.1 × 10−4 to 4 × 10−8 cm2 sec−1.
How many moles are in 1.80g of N2?
Answer:
28.0134
Explanation:
Answer:
Explanation:
n=m/Mr
Molar mass =2(14)
n=1.80/28
n= 0.064
Determine the bond type formed between Hg and F
a
Covalent
b
Simple Ionic
c
Multivalent Ionic
Answer:
Multivalent Ionic
Explanation:
The type of bond formed between the atoms of two elements can easily be deduced from the magnitude of electronegativity difference between the two bonding atoms.
A summary of electronegativity differences and corresponding types of bonds are shown below as adapted from chemlibretexts, where Δχ is the difference in electronegativity ;
ionic if Δχ ≥ 2.0
polar if 2.0 > Δχ > 0.5
nonpolar if 0.5 > Δχ
To determine the type of bond between Hg and F. Hg has an electronegativity of 2 while F has an electronegativity of 4. the difference in electronegativity (Δχ) is 4 - 2 = 2
This corresponds to a multivalent ionic bond because mercurous ion is the
Hg2^2+ ion and this leads to the formation of Hg2X2 (mercury I fluoride).
Which equation is balanced?
Answer:Liquid A: 0.358 g/ml
Liquid B: 0.605 g/ml
Liquid C: 1.677 g/ml
Explanation:
Liquid A: 0.358 g/ml
Liquid B: 0.605 g/ml
Liquid C: 1.677 g/ml
what is the molecular formula of water
Answer:
your very f,k,n, d,u,m,b
Explanation:
Answer:
H2o
Explanation:
Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.
Which of the following is an example of a combustion reaction?
A) Mixing of an acid and base
B) Photosynthesis in plants
C) Lighting of a Matchstick
D) Reacting sodium and chlorine
Answer:
C) Lighting a matchstick
Explanation:
Mixing an acid and base will cause a neutralization reaction, a type of double displacement.
Photosynthesis is just a series of chemical reactions, but don't deal with the use of O2, but rather it's creation.
Reacting sodium and chlorine would make NaCl in a synthesis reaction.
Answer:
C) Lighting a matchstick
Explanation:
What element am I?
1 valence electrons, 1 energy level
Group of answer choices
H
He
Li
Be
Answer:
H- hydrogen
Explanation: Hydrogen is in the first group meaning that it only has 1 valence electron and 1 energy level
It takes of heat to raise the temperature of Object A by , and to raise the temperature of Object B by . Suppose A and B are brought into contact. A is initially hotter. A is seen to cool down by . How would you calculate the rise in temperature of B? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
Hi, the given question is incomplete, the complete question is:
It takes 4.37 J of heat to raise the temperature of Object A by 1°C, and 2.88 J to raise the temperature of Object B by 1°C. Suppose A and B are brought into contact. A is initially hotter. A is seen to cool down by 6.3°C . How would you calculate the rise in temperature of B?
Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
Answer:
The correct answer is 9.56 degree C.
Explanation:
Based on the given information, the given object A is initially hotter than object B, and the direct contact between them permits the transfer of heat between them. Based on the law of conservation of energy, the energy cannot be created nor be destroyed. In the given case, the energy, which is lost from object A can only be gained by object B.
Let us consider that both the objects exhibits equal mass, now in order to determine the transfer of energy between them there is a need to multiply the heat capacity with the temperatures. Therefore,
Energy lost by object A = Energy gained by object B
Heat capacity of object A × Temperature lost by object A = Heat capacity of object B × Temperature gained by object B
4.37 J/°C × 6.3 °C = 2.88 J × Tb
Tb = (4.37 J/°C × 6.3° C) / 2.88 J
Tb = 9.56 °C
When you are getting up for school in Texas, a student on the other side of earth is getting ready for bed what is the reason for this?
A) The moon revolves around earth
B) Earth rotates on its axis
C) The sun rotates on its axis
D) Earth revolves around the sun
Answer:
Its B
Explanation:
Determine the pressure change when a constant volume of gas at 1.00 atm is
heated from 293 Kelvin to 303 Kelvin
Hurry please
Answer:
P₂ = 1.03 atm
Explanation:
Given data:
Initial pressure = 1.00 atm
Initial temperature = 293 K
Final temperature = 303 K
Final pressure = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
1.00 atm / 293 K = P₂/303 K
P₂ = 1.00 atm × 303 K / 293 K
P₂ = 303 atm. K /293 K
P₂ = 1.03 atm
pls help! no explanation needed
Which of these chemical equations describes an acid-base neutralization reaction?
1) 2Al(s) + 3H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + 3H₂(g)
2) SO₂(g) + H₂O(l) --> H₂SO₃(g)
3) LiOH(aq) + HNO₃(aq) --> LiNO₃(aq) + H₂O(l)
4) CaBr₂(aq) + H₂SO₄(aq) --> CaSO₄(s) + 2HBr(g)
Answer:
Option 3.
LiOH(aq) + HNO₃(aq) —> LiNO₃(aq) + H₂O(l)
Explanation:
To know which option is correct, we must have an ideal of what is acid–base neutralization.
Neutralization is a reaction involving an acid and a base which produces salt and water only.
With the above information, we can easily detect the equation describing acid-base neutralization reaction by considering the products of each reaction to see the one that has water as part of the products.
From the question given above, only the 3rd equation gas water as part of the products i.e
LiOH(aq) + HNO₃(aq) —> LiNO₃(aq) + H₂O(l)
Hence, equation 3 is an acid-base neutralization reaction
Iron reacts with oxygen gas to produce iron (III) oxide. If there are 52 grams of
iron present in this reaction how many grams of iron (III) oxide are produced
assuming a 100% yield? Also how many liters of oxygen are needed assuming
STP conditions?
Mass of Fe₂O₃ : 74.26 g
Volume of O₂ at STP = 15.624 L
Further explanationReaction
4Fe (s) + 3O₂ (g) ==> 2Fe₂O₃ (s)
mol Fe :
Ar Fe = 56 g/mol
[tex]\tt \dfrac{52}{56}=0.93[/tex]
mol Fe₂O₃ :
[tex]\tt \dfrac{2}{4}\times 0.93=0.465[/tex]
mass Fe₂O₃ :
MW Fe₂O₃ : 159,69 g/mol
[tex]\tt 0.465\times 159,69=74.26~g[/tex]
mol O₂ :
[tex]\tt \dfrac{3}{4}\times 0.93=0.6975[/tex]
volume O₂ at STP(1 mol=22.4 L)
[tex]\tt 0.6975\times 22.4=15.624~L[/tex]
What 2 elements are in the same group?
Oxygen and Chlorine
Sodium and Chlorine
Hydrogen and Sodium
Calcium and Helium
Explanation:
hydrogen and sodium are in same froup
6. What is the wavelength, in nm, associated with a photon of energy of 4.36 x 10-18 J? (4.56 x 101 nm)
The numbers in parenthesis is the answer that the teacher gave but I on't know how to get there. Help please!
Answer:
Explanation:
h= e/v
6.022 x 10^23 = 4.36 x 10^-18/ v
v= 6.58 x 10^15
C= lambda x frequency
3.00 x 10^8= 6.58 x 10^15 x lambda
lambda (y)= 4.56 x 10^-8
Answer:
Explanation:
λ = hc/E
6.626 x 10^-34 J-s x 2.998 x 10^8 m-s^-1
4.36 x 10^-18 J
= 4556.13486239
= 4.56 x 10^1 nm
0.22g of carbon dioxide are dissolved in 400 cm3 of pure water.
Calculate the concentration in mol/dm3 of the
solution produced.
Answer:
0.0125mol/dm³
Explanation:
Given parameters:
Mass of carbon dioxide = 0.22g
Volume of water = 400cm³
Unknown:
Concentration in mol/dm³ = ?
Solution:
Concentration is the amount of solute dissolved in a solvent.
The formula is expressed as;
Concentration = [tex]\frac{number of moles}{volume}[/tex]
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of CO₂ = 12 + 3(16) = 44g/mol
Number of moles = [tex]\frac{0.22}{44}[/tex] = 0.0005mol
Now,
1000cm³ = 1dm³
400cm³ = [tex]\frac{400}{1000}[/tex] = 0.4dm³
Insert the parameters and solve;
Concentration = [tex]\frac{0.005}{0.4}[/tex] = 0.0125mol/dm³
What happens when the thermal energy of a substance increases?
The motion of the particles in the substance increases, and the temperature of the substance decreases.
The motion of the particles in the substance decreases, and the temperature of the substance increases.
Both the motion of the particles in the substance and the temperature of the substance decrease.
Both the motion of the particles in the substance and the temperature of the substance increase.
Please answer fast
Answer:
D
Explanation:
D: Both the motion of the particles in the substance and the temperature of the substance increase.
I Hope That This Helps!!!
Both the motion of the particles in the substance and the temperature of the substance increase.
Thermal energy is the energy that is generated and measured by heat.Thermal energy cannot be converted to useful work as easily as the energy of systems that are not in states of thermodynamic equilibrium.As the thermal energy of a substance increases, both the motion of the particles in the substance and the temperature of the substance increase.For more information:
https://brainly.com/question/18989562?referrer=searchResults
Can light move through space even though there are no molecules?
Answer:
This means that waves need a medium to propagate, but light waves propagate where no particles are present. ...
Electrolysis of water occurs according to the following equation...
2H20 ->2H2+O2
If electrolysis is performed with 100% efficiency on 100 grams of water. How many grams of hydrogen gas will be produced?
a. 11 grams
b. 50 grams
c. 4 grams
d. 100 grams
Answer:
11.1g
Explanation:
Given parameters:
Mass of water = 100g
Unknown:
Mass of hydrogen gas = ?
Solution:
We need to write the balanced reaction equation first and solve from the known to the unknown;
2H₂O → 2H₂ + O₂
Now, find the number of moles of the given specie;
Number of moles of H₂O = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Number of moles = [tex]\frac{100}{18}[/tex] = 5.56mol
2 mole of water produced 2 mole of hydrogen gas;
5.56 mole of water will produce 5.56 mole of hydrogen gas
Mass of hydrogen gas = number of moles x molar mass
molar mass = 2(1) = 2g/mol
Mass of hydrogen gas = 2(5.56) = 11.1g
40 Points Need help ASAP
What would be the result on the Insect population if the Bats and Mice were removed?
Answer:
We wouldn't have Coronavirus
Explanation:
Explain why BH3 is trigonal planar and NH3 is trigonal pyramidal.
Answer:o It is important to realise that mixing will be small unless there are electrons in the 4a1 LUMO, this is why NH3 is pyramidal while BH3 is planar! ... This mixing is very strong and stabilises the 3a1 MO substantially and hence NH3 is trigonal pyramidal and not planar.
Explanation:
SiS2 is a _____ compound
Answer:
SiS2, silicone disulfide, is a linear, nonpolar compound.
Explain how fossil evidence is evidence of plate tectonics.
Answer:
Answer
Explanation:
Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. ... This distribution of fossils led to theories that the southern continents were once joined in a supercontinent called Gondwana.
Answer: Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.
Explanation: I hoped that helped plzz mark as brainliest !!
HELP PLEASE DUE SOON!!!
calculate the following the correct amount of significant figures 1.25+3.69277+125.993
Answer: 129.93577
Explanation:
There-
What are the six physical properties and 2 chemical properties of this image?
Please Help!!!
Answer:
physical - cloth
tree
brick
chair
lights
glass
chemical- fuel
fire
Explanation:
What type of heat transfer happens when warm air in
your living rises from the heater to the ceiling?
1. Radiation 2. Conduction 3. Convection
Answer:
the answer is radiation
Electron configuration
Answer:
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. This is also useful for describing the chemical bonds that hold atoms together.
Definition: This is a measure of the quantity of matter.
Example: Yours may be 65 kilograms. You measure it with an analytical balance.
Answer:
Mass
:)
Explanation:
Answer:
Mass
Explanation:
In the process of cooking, making tea, or mixing paint, you combined substances. Sometimes, the act of mixing substances results in the formation of new substances.
If two substances mix and one or more new substances form, a chemical change has occurred. Which event do you think results in a chemical change?
A.
Oil and vinegar mix to make salad dressing.
B.
Copper and zinc mix to make brass.
C.
Salt and water mix to make salt water.
D.
Sugar and water mix to make sugar water.
Answer:
B.
Copper and zinc mix to make brass.
Explanation:
This is the only answer in which a new substance is created, the rest of the choices are just mixtures
why doesn't she want me
Answer:
Who knows...
Explanation:
:( :( :( :( :(
The density of aluminum is 2.70 g/cm^3? How many aluminum atoms are in a block of aluminum
with a volume of 114.2 cm^3?
Answer:
68.77×10²³ atoms
Explanation:
Given data:
Density of Al = 2.70 g/cm³
Volume of Al block = 114.2 cm³
Number of atoms of Al = ?
Solution:
First of all we will determine the mass of Al.
D = m/v
2.70 g/cm³ = m/114.2 cm³
m = 2.70 g/cm³ × 114.2 cm³
m = 308.34 g
Now we will calculate the number of moles of Al.
Number of moles = mass/molar mass
Number of moles = 308.34 g/27 g/mol
Number of moles = 11.42 mol
Number of atoms of Al:
1 mole = 6.022×10²³ atoms
11.42 mol × 6.022×10²³ atoms/1 mol
68.77×10²³ atoms