Answer:
A. the cathode
Explanation:
Answer:
A. The cathode
Explanation:
a p e x
A hypothesis must be testable. Which hypothesis is testable? *
Ablue is the best color.
BSummer is nicer than fall.
CDogs are better than cats.
DA beagle can jump higher than a Persian cat.
the answer is D because can be tested the others ones is opinion
please mark me as brainliest
For the combustion of methane, CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) △H = -213
kcal/mol
How many kilocalories of energy are released from 5.0 mol of methane?
How many moles of methane are needed to give 100. kcal heat?
Answer:
1.-213(kcal/mol)*5mol=1065kcal
2.100/213 mol
a. The energy released from 5.0 mol of methane is -1065 kcal/mol.
b. The number of moles of methane needed to give 100. kcal heat is 0.4694 moles.
What is combustion?Combustion is a chemical process in which the element reacts with oxygen to produce heat and light. Burning of wood.
The equation of combustion of methane:
CH₄ (g) + 2O₂(g) ------> CO₂ (g) + 2H₂O (l)
a) Enthalpy of the reaction is H = -213 Kcal/mol
This means 213 Kcal heat is released in the burning of one mole of CH4
H reaction = [ H products ] - [ H reactants ]
Hr = [ H(CO₂)g + 2H(H₂O)l ] - [ H(CH₄)g ] = -213 kcal/mol
For 5 moles of methane:
5CH₄(g) + 10O₂(g) -----> 5CO₂(g) + 10H₂O(l)
therefore, new Hr = 5 x -213 = -1065 kcal/mol
H reaction = -1065 kcal/mol
b) 213 kcal is released per mole of Methane
then, to release 100 kcal we need, 100 / (213) = 0.4694 moles
Thus, the energy released is -1065 kcal/mol, and the number of moles is 0.4694 moles.
Learn more about combustion, here:
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Answer quick (image)
Answer:
The answer is boiling point
which type of wave shows energy transmitted in a definite direction and with a definite speed?
A balloon containing methane gas has a volume of 1.03 L at 99.0 °C . What volume will the balloon occupy at 198 °C ?
Answer:
The balloon will occupy a volume of 1.32L.
Explanation:
Given the following data;
Original Volume, V1 = 1.03L
Original Temperature, T1 = 99°C
New Temperature, T2 = 198°C
To find new volume V2, we would use Charles' law.
Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Charles is given by;
[tex] VT = K[/tex]
[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]
Converting T1, from Celsius to Kelvin = 273 + 99 = 372K
Converting, T2, from Celsius to Kelvin = 273 + 198 = 471K
[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]
Making V2 as the subject formula, we have;
[tex] V_{2}= \frac{V1}{T1} * T_{2}[/tex]
[tex] V_{2}= \frac{1.03}{372} * 471[/tex]
[tex] V_{2}= 0.0028 * 471[/tex]
V2 = 1.32L
Therefore, the balloon will occupy a volume of 1.32L at 198°C
Electrons in the outermost shell of an atom that are available to bond with the electrons of other atoms are
Question 11 options:
A)
cations.
B)
free electrons.
C)
valence electrons.
D)
anions.
Question 12 (5 points)
Main group elements have valence electrons in which suborbitals?
Question 12 options:
A)
d and f
B)
s and p
C)
p and f
D)
s and d
Question 13 (5 points)
Molecules have
Question 13 options:
A)
only kinetic energy.
B)
only potential energy.
C)
both potential and kinetic energy.
D)
neither kinetic nor potential energy.
Question 14 (5 points)
The majority of elements are
Question 14 options:
A)
metalloids.
B)
nonmetals.
C)
metals.
D)
inert.
Question 15 (5 points)
A student found the mass of an object to be 26.5 g. To find the volume, the student submerged the object in a graduated cylinder of water. Submerging the object in the water in the graduated cylinder increased the water level by 24.1 mL. The density of the object is
Question 15 options:
A)
1.0906 g/mL.
B)
0.909 g/mL.
C)
1.10 g/mL.
D)
1.1 g/mL.
Answer:
c
Explanation:
definitely
Answer: 11; C
Explanation:
valance electrons
Match the descriptions below with the graphs. Be sure to explain your answers.
What is the velocity of a wave?
A. How much energy the wave has
B. How quickly the wave travels
C. The distance between two wave peaks
D. The distance between the high and low points of the wave
Which of the following situations best describes an ionic bond?
Two atoms each give up an electron, and an electrostatic force attracts them.
One atom gains an electron while the other atom loses an electron, and an
electrostatic force attracts them.
One atom gains an electron while the other atom loses an electron, and an
electrostatic force repels them.
Two atoms gain electrons and an electrostatic force attracts them.
The situation which best describes the ionic bond is “ One atom gains an electron while the other atom loses an electron, and an electrostatic force attracts them”.
What is an ionic bond?
An ionic bond is formed between two atoms by donating an electron from the electropositive atom and withdrawal of that electron by the second atom which is electronegative and thereby attaining stability by making their valency completed.
The electron loss-gain interaction make an electrostatic force of attraction between them, where the electrons from the electropositive atom is attracted towards the electronegative atom.
Thus the two atoms are bound together by the electrostatic force of attraction created by the electron donation. Hence, option b is correct.
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At what time was the frog sitting still or at rest
Answer:
frogs don't spend all their time swimming, nor do they spend all ... The frog is capable of sitting perfectly still for hours on end, only to suddenly ... When a frog is resting or hunting, he will sit on whatever is handy.
Explanation:
Hope I helped if I did please mark me brainiest Thanks! <333 :3
A person drops two objects from the same height. one object weighs 15 N and the other weighs 10 N
A The 10 N object has the same mass as the 15 N object
B The 15 N object has twice the mass of the 10 N object
C The 15 N object has more mass than the 10 N object
D The 10 N object has more mass than the 10 N object
Help PlS AFAP and thank you so much
the answer is B transfer thru direct contact
75 g of a metal is heated to a temperature of 99C. The metal is then placed in a calorimeter containing 145 g of water at a temperature of 25C. The temperature of the water in the calorimeter increase to a final temperature of 28C. What is the specific heat of the metal?
Answer:
0.34 J / g ⁰C
Explanation:
Let the specific heat of metal be s .
heat will be lost by hot metal and gained by water .
heat lost by metal = mass x specific heat x loss of temperature
= 75 x s x ( 99 - 28 ) = 5325 s
heat gained by water = mass x specific heat x gain of temperature
= 145 x 4.18 x ( 28 - 25 ) = 1818.3
heat lost = heat gained
5325 s = 1818.3
s = 0.34 J / g ⁰C
Chemical equation to show cdso4 dissolves in water
no se bb si quieres salimos tu sabes
PWEASE REVIEW ME AND ME MATES TEEF
which group of substances are elements?
A.Air,water,cooking oil
B.carbondioxide,water,table salt
C.carbon,hydrogen,oxygen
D.rock,soil,iron ore
Answer:
C
Explanation:
(A+B) are compounds and D is mixtures
what is the relationship between netforce and acceleration based on the situation?
Answer:
The net force is greater at the second situation as well as the acceleration due to the contribution of the second guy.
Explanation:
Hello.
In this case, since the net force is computed via adding all the exerted forces on a body, for the first situation we can see that the net force equals the force provided by that guy when pulling, whereas in the second situation the net force equals the force of both of the guys pulling the car:
[tex]F_N_1=F_1\\\\F_N_2=F_1+F_2[/tex]
For the acceleration, we can see that applying an extra force (due to the second guy) turns out into a greater acceleration, that is why the car at the second situation reaches the tree whereas the other one does not.
Best regards.
Neurons contain which two structures that help them transmit messages?
sarcomeres
dendrites
an extracellular matrix
axons
Answer:
dendrites
axons
Explanation:
got it right on edg.
Answer:
B and D
Explanation:
edge
what is the volume in cubic meter and in cubic decimeter of 2.0mol of nitrogen on gas at 1000c and 100,000pa? (R=8.31j/molk)
Given parameters:
Number of moles of Nitrogen = 2.0mole
Temperature of the gas = 1000c
Pressure on the gas = 100000Pa
Gas constant R = 8.31J/molK = 0.082atmdm³mol⁻¹k⁻¹
Unknown:
Volume in cubic meter and cubic decimeter = ?
Solution:
The ideal gas law is given as;
PV = nRT
where P is the pressure on the gas
V is the volume of the gas
n is the number of moles
R is the gas constant
T is the temperature of the gas
Let us convert to appropriate units;
1000°C to K;
K = 1000 + 273 = 1273K
100000Pa to atm;
101325Pa = 1atm
100000Pa = 0.99atm
Input the parameters and solve for the unknown;
0.99 x V = 2 x 0.082 x 1273
V = 210.9dm³
to m³;
1000dm³ = 1m³
210.9dm³ = [tex]\frac{210.9}{1000}[/tex] = 0.21m³
When does a single-displacement reaction occur?
A. When a substance, usually containing carbon, reacts with oxygen
to produce energy in the form of heat and light
B. When one element replaces another element in a compound
during a chemical reaction
C. When a substance is broken down into two or more simpler
substances in a chemical reaction
D. When a single element forms two double elements
Answer:
B. When one element replaces another element in a compound during a chemical reaction
PLEASE HELP ME!!
I am smaller than Rb and bigger than Na but we are in the same family.
H
K
N
Cs
Is it easier to remove an electron from Mg or from Cl?
Mg
Cl
Answer: K and Mg
Explanation:
The first one refers to the atomic radius and increases going down and to the left on the periodic table. K is in between Rb and Na.
What factor is mostly responsible for the form of matter?
time
temperature
pressure
weather
Temperature is mostly responsible for the form of matter. For instance, when raising the temperature you're adding energy. This energy gives the individual molecules and atoms the ability to overcome the forces that hold them together. This can be seen when a solid turns into a liquid or a liquid turns into a gas. However, when you're lowering the temperature you're removing energy. The lack of energy results in less movement from the atoms. Gases condense into liquid because the atoms don't have enough energy to stay away from each other. Liquids solidify because the atoms don't have enough energy to slide past each other and they get stuck in place. So in conclusion, temperature determines how how much energy atoms have that allow them to move at different speeds which determines the state of matter.
Electronic configuration PLZZZ GUYSS(sub shell distribution) for L shell will be .........................
Answer:
Shells
The maximum number of electrons that can be accommodated in a shell is based on the principal quantum number (n). It is represented by the formula 2n2, where ‘n’ is the shell number. The shells, values of n, and the total number of electrons that can be accommodated are tabulated below.
Shell and ‘n’ value Max. Electrons in the Electron Configuration
K shell, n=1 2*12 = 2
L shell, n=2 2*22 = 8
M shell, n=3 2*32 = 18
N shell, n=4 2*42 = 32
L shell: n =2
hence,
2n²
= 2(2)²
i.e. 8 electrons can fit in the l shell
hence max no. of electrons is 8
so configuration in L shell is,
2, 8...
WILL mark Brainliest
Answer:
Ok what question
Explanation:
As the atomic number of elements increases across a period on the periodic table, the atomic radius
Answer:
Decreases
Explanation:
g If the pressure of each gas is increased at constant temperature until condensation occurs, which gas will condense at the lowest pressure
The question is incomplete; the complete question is;
If the pressure of each gas is increased at constant temperature until condensation occurs, which gas will condense at the lowest pressure?
A) Octane
B) Ethane
C) Butane
D) All the gases will condense at the same pressure
Answer:
Octane
Explanation:
If we study the table closely we will realize that octane has the greatest molecular mass among all the gases shown.
The greater the molecular mass, the lower the pressure required for the condensation of the gas. Hence, the lowest pressure is required for the condensation of octane at constant temperature.
Write the equation for the dehydration of the CoCl2 hydrate
Galium is a metal that can melt in your hand at 302.93 k. what is the temperature in celcius ?
Explanation:
subtract it into 273.15to convert it in to celcius
Is the moons rate rotation that same as earths
Answer:
no
Explanation:
Answer:no
Explanation:The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis.
As we will soon see in Section 4.5, gasoline is a complex mixture of alkanes and other hydrocarbons, and the term "octane rating" is used as a standard measure of the performance of engine fuel. In the petroleum industry, one area of interest is the use of catalysts to convert unbranched alkanes and branched alkanes with higher octane ratings (Journal of the Japan Petroleum Institute 2004, 47, 1–10). For example, heptane can undergo isomerization in the presence of suitable catalysts to give eight different constitutional isomers, all of which are branched alkanes with the molecular formula C7H16. Draw all eight constitutional isomers, making sure not to draw the same compound twice.
Answer:
Explanation:
C₇H₁₆ is heptane and it has nine isomers (n-heptane and the remaining 8 constitutional isomers). Constitutional isomers are compounds with the same molecular formula but different structural formula or atom connectivity.
The constitutional isomers of n-pentane are 2-methylhexane, 3-methylhexane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 3-ethylpentane and 2,2,3-trimethylbutane. There structures are in the picture attached