When electricity is produced from coal the chemical energy in coal is changed to ___ energy
Answer: electrical energy
Explanation:
According to law of conservation of energy, energy remains conserved. It only transforms from one form to another.
Chemical energy is the energy stored in the bonds of molecules.
Electrical energy is the energy possessed by a body by virtue of movement of electrons.
Thus when When electricity is produced from coal the chemical energy in coal is changed to electrical energy
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 !!
Jocelyn and her friends put some raisins, hazelnuts,
almonds, and peanuts in a bowl to make a snack for their
hiking trip. What does this snack represent?
A. a solution
B. a new element
C. a new compound
D. a mixture
plspslsspslpsl help its revision for exam and i need it quick brainliest for the right answer :D
Answer: D. a mixture
Explanation: When you mix different types of nuts or snacks together including raisins, hazelnuts, almonds, and peanuts to make some kind of trail mix, then you are creating a mixture, specifically a heterogeneous mixture.
What happens to water when it freezes
A: It’s mass increases
B: its mass decreases
C: Its density increases
D: Its density decreases
Answer:
D. It's density decreases
I'm not sure ok.. Ask an adult for making sure
How do you think dolphins find food in dark water, especially if
what they are looking for does not make any noise? What other
sense might they use to "see” without using their eyesight?
Answer: Dolphins use the sense (sound) to find food in dark water.
Explanation: Echolocation allows dolphins to “see" by interpreting the echoes of sound waves that bounce off of objects near them in the water. To echolocate objects nearby, dolphins produce high-frequency clicks. ... This information is critical for dolphins to find food and navigate in dark or murky waters.
Acid rain is a type of pollution caused mainly from
fertilizer use
high concentrations of nitric and sulfuric acid from pollution
use of pesticides
CFC's
с
d
Answer:
im pretty sure its the second one
What reaction would the chemical equation 2H2O→2H2+O2 represent?
combustion of water
decomposition of water
replacement of water
formation of water
Answer:
decomposition of water
Explanation:
The reaction will represent the decomposition of water. It usually carried by an electrolytic process in the laboratory.
Water molecule is broken down into its constituent hydrogen gas and oxygen gas components. The breaking down of one compound to give other compounds is decomposition. This is not a replacement reaction. In decomposition, we often start with a single reactant and results in one or more products.Answer:
decomposition of water
Explanation:
i took the quiz and it was right
Write down the names of compounds represented by the following formulae:
a. Al2(SO4)3
b. CaCl2
c. K2SO4
d. KNO3
e. CaCO3
Hellp plss
The compounds have been formed by the combination of molecules and atoms. The names are a. aluminum sulfate, b. calcium chloride, c. potassium sulfate, d. potassium nitrate, and e. calcium carbonate.
What is the chemical formula?The chemical formula has been defined as the representation of the chemical compound or molecules with the aid of symbols, letters, and coefficients to show the proportions, arrows, parentheses, signs, etc.
The chemical formulas are named as:
Al₂(SO₄)₃ - aluminum sulfate. It has been used in purifying water, sewage treatment, tanning, paper industries, etc.CaCl₂ - calcium chloride. It is an ionic compound used in making electrolytes and sports drinks.K₂SO₄ - potassium sulfate. It has been used for making fertilizers for tobacco and vegetable crops.KNO₃ - potassium nitrate. It is an oxidizer used for making explosives and fertilizers.CaCO₃ - calcium carbonate. It is used as a dietary product to satisfy the needs for calcium and vitamin D for bone strengthening and formation.Learn more about chemical formulas, here:
https://brainly.com/question/16950183
#SPJ6
We cooleda water bottle so the volume was lowered to .050 L, then we heated it to 373 K and thevolume increased to .10 L. What was the initial temperature?
Answer:
[tex]186.5\ \text{K}[/tex]
Explanation:
[tex]V_1[/tex] = Initial volume = 0.05 L
[tex]V_2[/tex] = Final volume = 0.1 L
[tex]T_1[/tex] = Initial temperature
[tex]T_2[/tex] = Final temperature = 373 K
From the ideal gas law we have
[tex]PV=nRT[/tex]
So
[tex]V\propto T[/tex]
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\Rightarrow T_1=\dfrac{V_1}{V_2}\times T_2\\\Rightarrow T_1=\dfrac{0.05}{0.1}\times 373\\\Rightarrow T_1=186.5\ \text{K}[/tex]
The intial temperature is [tex]186.5\ \text{K}[/tex].
How many moles are in 16.2 grams of lithium ?
Answer:
6.941 moles
Explanation:
Which statement best explains why an object appears green in sunlight?
A- The object absorbs most white light and refracts most green light.
B- The object refracts most white light and absorbs most green light.
C- More green light is absorbed while more red and blue light is reflected.
D- More green light is reflected while more red and blue light is absorbed.
Answer:
b
Explanation:
How many molecules are in a mole 0.500 mile of N205
write the electron configurations for the elements that are identified only by these numbers
a. 15 b. 12 c. 9 d. 18
atomic number 15
1S^2,2S^2,2P^6,3S^2,3P^3
atomic number 12
1S^2,2S^2,2P^6,3S^2
atomic number 9
1S^2,2S^2,2P^5
atomic number 18
1S^2,2S^2,2P^6,3S^2,3P^6
Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 1.1 g of octane is mixed with 1.04 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to significant digits.
Why is it important to know the weather?
Answer:
so you can dress based on how hot or cold it's gonna be outside
Iridium has two naturally occurring isotopes, Iridium-191 and Iridium-193. If the average atomic mass of orodum s 192.217, what are the average percent abundances of each isotope?
Answer:
The percent isotopic abundance of Ir-193 is 60.85 %
The percent isotopic abundance of Ir-191 is 39.15 %
Explanation:
we know there are two naturally occurring isotopes of iridium, Ir-191 and Ir-193
First of all we will set the fraction for both isotopes
X for the isotopes having mass 193
1-x for isotopes having mass 191
The average atomic mass is 192.217
we will use the following equation,
193x + 191(1-x) = 192.217
193x + 191 - 191x = 192.217
193x- 191x = 192.217 - 191
2x = 1.217
x= 1.217/2
x= 0.6085
0.6085 × 100 = 60.85 %
60.85% is abundance of Ir-193 because we solve the fraction x.
now we will calculate the abundance of Ir-191.
(1-x)
1-0.6085 =0.3915
0.3915× 100= 39.15 %
Is it possible for something such as a cake or a potato to get so hot that it melts? Normally when you heat something up a whole lot, it melts, but when you put liquid cake batter in an oven it turns into a solid, then it burns, but is there a way to heat it up so much so that it turns back into a liquid? Same thing with a potato, if you heat it up, it will burn, but can you turn a potato into a liquid by heating it up too much? Plz help im rlly stuck...
Answer:
I dont think so. If you continue to heat them up they will shrink and dissapper r become ashes. Thats a very interesting question btw. :) hope this helps!
Explanation:
Which is the correct orbital diagram for carbon?
ОА.
1s
2s
2p
OB.
1s
2s
2p
112 1
2p
Ос.
1s
2s
OD.
1s
2s
2p
11
The modern periodic table consists of the elements which are arranged in the increasing order of their atomic numbers. The element 'C' belongs to 14th group of the periodic table. The correct option is A.
What is orbital diagram?The orbital diagrams are the pictorial representation of the electrons in an atom. The orbital diagrams are mainly based on the Auf Bau principle, Pauli's exclusion principle and Hund's rule of maximum multiplicity.
According to Auf Bau principle, the electrons are arranged in the orbitals in the increasing order of their energies. The pauli's exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers.
The hund's rule states that the unpaired electrons in the orbitals have parallel spins. The atomic number of 'C' is 6, and its electronic configuration is 1s²2s²2p².
Thus the correct option is A.
To know more about orbital diagrams, visit;
https://brainly.com/question/11270343
#SPJ7
Question:
A. Does this picture show a physical or chemical change? How do you know?
B. Does this picture show a physical or chemical change? How do you know?
Answer:
A. Chemical
B. physical
Explanation:
Identify each statement below as an example of science or pseudoscience.
If food dropped on the floor is picked up within 5 seconds, it is okay to eat.
science or pseudoscience
Answer: pseudoscience
Explanation:
Edge 2020
Answer: pseudoscience
Explanation: It is an opinion that is subjective.
what is the molar mass of ammonium sulfite
Answer: 116.15 g/mol
Help please I don’t know
Answer:
I don't EXACTLY know but hopefully the description below helps you find the answer!
Ionic bonding is a type of chemical bond in which valence electrons are lost from one atom and gained by another. This exchange results in a more stable, noble gas electronic configuration for both atoms involved. An ionic bond is based on attractive electrostatic forces between two ions of opposite charge.
Explanation:
if compose means to put together then decompose means to what?
Answer:
Break apart
Explanation:
Decompose: to break down or cause to break down into component elements or simpler constituents.
Plants contain three types of tissue. Describe the function of each. What are the tissues made of?
Each plant organ (roots, stems, leaves) contains all three tissue types: ... Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem
PLEASE MARK ME AS BRAINLIEST
Screenshot very easy
1. option B
2. ground state Fe : [Ar] 4s² 3d⁶
Further explanationAufbau rule
Electrons occupy orbitals of the lowest energy level
Charging electrons in the sub-shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
So the correct choice of answer is B.
Ground state is the state of electrons filling skins with the lowest energy levels.
Excited state is the state of electrons which occupy a higher energy level
The atomic number of Fe = 26, so electrons=26
Ground state configuration of Fe : [Ar] 4s² 3d⁶ or
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d⁶
Answer:
d
Explanation:
What is the mass of 2.23 x 10^23 atoms of sulfur?
Answer: 32.07 g/mole
Explanation:
1 mole of sulfur contains 6.022 ×10^23 atoms
1 mole is equal to 32.07 g
6.022 ×10^23 atoms = 32.07
if the percentage yield of a reaction is 85%
Answer: % yield
=
actual yield
theoretical yield
⋅
100
%
So, let's say you want to do an experiment in the lab. You want to measure how much water is produced when 12.0 g of glucose (
C
6
H
12
O
6
) is burned with enough oxygen.
C
6
H
12
O
6
+
6
O
2
→
6
C
O
2
+
6
H
2
O
Since you have a
1
:
6
mole ratio between glucose and water, you can determine how much water you would get by
12.0
g glucose
⋅
1 mole glucose
180.0 g
⋅
6 moles of water
1 mole glucose
⋅
18.0 g
1 mole water
=
7.20
g
This represents your theoretical yield. If the percent yield is 100%, the actual yield will be equal to the theoretical yield. However, after you do the experiment you discover that only 6.50 g of water were produced.
Since less than what was calculated was actually produced, it means that the reaction's percent yield must be smaller than 100%. This is confirmed by
% yield
=
6.50 g
7.20 g
⋅
100
%
=
90.3
%
You can backtrack from here and find out how much glucose reacted
65.0 g of water
⋅
1 mole
18.0 g
⋅
1 mole glucose
6 moles water
⋅
180.0 g
1 mole glucose
=
10.8
g
Explanation:
Answer:no answer,
Explanation: but if the other dude see this can you re word Wht u said it’s hard to make sense of it
Which chemical equation below is balanced to correctly represent the Law of Conservation of Mass?
Answer:
The 3rd equation.
Cl2 + 2NaBr —> 2NaCl + Br2
Explanation:
The law of conservation of matter (mass) states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another. This implies that unbalanced chemical equation shows that matter (mass) has been created or destroyed.
Now, we shall determine which equation is balanced as follow:
1. 2Cl2 + NaBr —> 2NaCl + Br2
Reactant >>>>>>>> Product
4 Cl >>>>>>>>>>>> 2 Cl
1 Na >>>>>>>>>>>> 2 Na
1 Br >>>>>>>>>>>> 2 Br
Thus, the equation is not balanced.
2. Cl2 + NaBr —> NaCl + Br2
Reactant >>>>>>>> Product
2 Cl >>>>>>>>>>>> 1 Cl
1 Na >>>>>>>>>>>> 1 Na
1 Br >>>>>>>>>>>> 2 Br
Thus, the equation is not balanced.
3. Cl2 + 2NaBr —> 2NaCl + Br2
Reactant >>>>>>>> Product
2 Cl >>>>>>>>>>>> 2 Cl
2 Na >>>>>>>>>>> 2 Na
2 Br >>>>>>>>>>>> 2 Br
Thus, the equation is balanced.
From the illustration made above only the 3rd equation is balanced. And this is in line with the law of the Conservation of matter (mass) as matter (mass) was not created nor destroyed during the chemical reaction but was transferred to other forms.
PLEASE HELPPPPP :(
Megan likes to take hot showers before she goes to bed. She makes sure that the temperature of the water is warm enough to create steam. When she gets out of the shower, she has to wipe the mirror because there is so much water on it. Which statement best describes why there is water on the mirror?
A. The steam collected on the mirror and got cooler, causing it to condense into water droplets.
B. The steam collected on the mirror and got warmer, causing it to condense into water droplets.
C. The steam collected on the mirror and then boiled, leaving behind water droplets.
D. The steam collected on the mirror and then evaporated, leaving behind water droplets.
Answer:
A
Explanation:
Plz help it's due soon. Calculate the energy and frequency of red light having a wavelength of 6.55 x 10⁻7m.
Answer:
E = 3.035× 10-¹⁹J = 1.9eV
f = 4.58 × 10¹⁴Hz
Explanation:
wavelength = 6.55 × 10-⁷m
c = 3 × 10⁸m/s
f = ?
E = ?
a) f = c/wavelength
f = 3 × 10⁸/6.55 × 10-⁷
f = 4.58 × 10¹⁴Hz
b) E = hc/wavelength
E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷
E = 3.035 × 10-¹⁹J
1ev = 1.6 × 10-¹⁹J
Therefore E = 3.035/1.6 = 1.9eV
Hope it's not too late man