answer is a and no need to worry
Answer: correct. Adminstrators
Explanation:
Calculate the total amount of energy required in calories to convert 50.0 g of ice at 0.00 degrees Celsius to steam at 100. degrees Celsius.
Specific heat capacity of water is 1.00 cal/g OC
Hfusion = 80 cal/g OC and Hvap = 540 cal/g OC
Write the complete equation you will use. 1 point
Substitute the values in the equation in step 1. 1 point
Report the math answer with 3 sig figs and the correct unit. 1 point
Answer:
HFusion*mass + Spec.Heat*mass*ΔT + HVap*mass
80cal/g*50.0g + 1.00cal/g°C*50.0g*(100°C-0°C) + 540cal/g*50g
3.60x10⁵cal
Explanation:
Using the HFusion we can find the heat needed to convert the ice to liquid water.
With specific heat capacity we can find the heat needed to increase the temperature of water from 0 to 100°C.
With HVap we can find the heat to convert the liquid water into steam.
The equations are:
HFusion*mass + Spec.Heat*mass*ΔT + HVap*massComputing the values:
80cal/g*50.0g + 1.00cal/g°C*50.0g*(100°C-0°C) + 540cal/g*50g36000cal =
3.60x10⁵calDoes a reaction involving an acid and a base have to take place in a water environment? Justify your answer.
Answer:
YES!!!
Explanation:
Strong acids and strong bases are both strong electrolytes. In contrast, only a fraction of the molecules of weak acids and weak bases react with water to produce ions, so weak acids and weak bases are also weak electrolytes.
how many atoms are in 3 moI of helium
Answer:
1.806x10^24Explanation:
1 mole of helium gas contains 6.02 x10^23 helium atoms. So multiply this by 3 after solving the equation.
Who is known as the "father of modern chemistry” because he first organized all known elements into four different groups?
Johann Wolfgang Döbereiner
Antoine Lavoisier
Dmitri Mendeleev
Henry Moseley
Antoine Lavoisier is known as the "father of modern chemistry” because he first organized all known elements into four different groups.
Antoine Lavoisier made many different and important discoveries in chemistry. He also established water as combination of Hydrogen and Oxygen and that is the very basic beginning of chemistry. The contemporary naming system for chemical compounds is also invented by him. Modern system of chemical nomenclature was the first co-authored by Antoine Lavoisier. He also formulated the law of conservation of mass in chemistry. He has been known as the "Father of Modern Chemistry" because of his brilliant and most important impacts on the history of chemistry.
Therefore, Antoine Lavoisier is known as the "father of modern chemistry” because he first organized all known elements into four different groups.
To learn more about Antoine Lavoisier click:
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What is the volume of 2.66 x 10^23 molecules of N2 gas at STP? PLEASE ANSWER WITH WORK! ILL GIVE BRAINLIEST
Answer:
1100L.
Explanation:
The chemical properties of an element are determined by which
particle of an atom?
electron
b
nucleus
оооо
proton
neutron
The chemical properties of an element are determined by which particle of an atom?
[tex]\longrightarrow{\green{c.\:proton}}[/tex]
Explanation:
The chemical properties of an element are determined by the subatomic particle known as a proton. The number of protons in an atom is called its atomic number ( Z ).
[tex]\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{♡}}}}}[/tex]
Which substances in the diagram are most unstable? positive values of enthalpy negative values of enthalpy negative values -50 to -100 values near zero
Answer:
Positive values of Enthalpy
Explanation:
Got it right on Odessyware. Have a nice day!!!
PLEASE give me Brainliest
write an assignment on primary sources of information on modern Indian history
please answer
please
please
Explanation:
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arrow_backSources of Information on Modern Indian History
Summary
Videos
References
A primary source of information for historians is the official records of the British administration. The British kept written records of every key instruction, meeting, transaction, investigation, plan, policy decision and agreement. They attached record rooms with all the important administrative institutions.
The British built specialized institutions like museums and archives to preserve important documents.
Historians gather important information about the provincial administrative system from the reports, memos, notings and letters preserved in the 19th century in the archives and record rooms across India.
For effective administration, the British carried out a number of surveys in the early 19th century.
By the end of the 19th century, censuses of all the Indian provinces were being carried out every ten years. This helped to collect information on the religion, caste and occupation of the people. These surveys have helped historians to collect information about modern India.
Personal diaries of personalities like Jawaharlal Nehru and Sardar Vallabhbhai Patel, newspapers, popular books like The Discovery of India and Glimpses of World History, autobiographies of personalities like Mahatma Gandhi, and accounts of travellers and pilgrims give a deep insight into the lives of the common people.
What is the most likely result of the pollution of a fresh water resource?
Answer:
Loss of biodiversity in the wetlands.
Explanation: Pollution can be defined as the emission of toxic, poisonous and harmful chemical substances which are capable of causing environmental degradation and contamination.
Nitrogen pollution enters Earth’s freshwater resources from a variety of human activities, including the use of fertilizers and pesticides in agriculture. This nitrogen pollution has a negative effect on plants and animals living in fresh water. Certain wetland plants, however, are able to purify the water and restore it to its non-polluted state.
Hence, what would most likely increase the negative effects of nitrogen pollution is a loss of biodiversity in the wetlands i.e the various species of animal and plants.
What plate forms a boundary with the African plate
Answer:
The Eurasian plate(another major plate), the Aegean sea plate and the Anatolian plate share the north border. The Antarctic plate that contributes to the south of the African plate, is also a major plate.
The electrolysis of water has the equation 2H2O (l) → 2H2 (g) + O2 (g). What type of reaction is this?
Question 9 options:
A)
Single displacement
B)
Double displacement
C)
Decomposition
D)
Synthesis
Answer: The correct option is C) decomposition
Explanation:
Single displacement reaction is defined as the reaction where a more reactive element displaces a less reactive element from its salt solution.
[tex]AX+B\rightarrow BX+A[/tex]
Element B is more reactive than element A
Double displacement reaction is defined as the reaction where an exchange of ions takes place in a solution
[tex]AX+BY\rightarrow AY+BX[/tex]
Decomposition reaction is defined as the reaction where a single large chemical species breaks down into two or more smaller chemical species.
[tex]AB\rightarrow A+B[/tex]
Synthesis reaction is defined as the reaction where two or more smaller chemical species combine together in their elemental state to form a single large chemical species.
[tex]A+B\rightarrow AB[/tex]
For the given chemical reaction:
[tex]2H_2O(l)\rightarrow 2H_2(g)+O_2(g)[/tex]
Here, water is breaking down into two smaller species of oxygen and hydrogen gas. Thus, it is a decomposition reaction.
Hence, the correct option is C) decomposition
Answer:
Decomposition
Explanation:
How much heat is required to raise the temperature of 16.0 grams H2O from 5.000C to 75.00C? Below is a list of constants.
specific heat for H2O(s) = 2.1 J/g0C
specific heat for H2O(L) = 4.18 J/g0C
specific heat for H2O(g) = 1.7 J/g0C
\bigtriangleup H△Hvap = 40.7 kJ/mol
\bigtriangleup H△Hfus = 6.01 kJ/mol
5.34 J
260 J
4680 J
2350 J
Answer:
The amount of heat required is 4681.6 J.
Explanation:
mass, m = 16 g = 0.016 kg
initial temperature, T = 5 C
final temperature, T' = 75 C
specific heat, c = 4.18 J/g C
The amount of heat required is
H = m c (T'- T)
H = 16 x 4.18 x (75 - 5)
H = 4681.6 J
Which process will decrease the level of CO2 in the atmosphere?
A.
growing trees
B.
cutting trees
C.
burning trees
D.
increasing the human population
Answer:
A
Explanation:
a liquid is boiled in a beaker until all of the liquid has evaporated. a powdery substance remains in the beaker. which does this indicate about the original liquid
ASAP PLEASE IM LITERALLY IN THE EXAM RN
How many grams of sodium are needed to produce 12.5g of sodium oxide
Answer:
25 possibly
Explanation:
I'm not too sure about this, but sodium oxide is Na2O, 2 sodium and 1 oxygen, so 12.5g * 2 is 25
If someone else comes up with a more convincing argument listen to them
I neeeeed heeeeeelppppppp
Answer:
I think no. 4
Explanation:
It is true that Earth’s orbit is not a perfect circle. It is slightly elongated, so that during part of the year, Earth is closer to the Sun than at other times. However, in the Northern Hemisphere, we are having winter when Earth is closest to the Sun and summer when it is farthest away!
There is a completely different reason for Earth's seasons.
Earth's axis is an imaginary pole going right through the center of Earth from "top" to "bottom." Earth spins around this pole, making one complete turn each day. That is why we have day and night, and why every part of Earth's surface gets some of each.
Earth has seasons because its axis doesn't stand up straight
(to be clear I just copied it from some resources)
From lithium and cesium which is less electronegative?
Answer:Electronegativity, symbolized as χ, is the tendency of an atom to attract shared electrons (or electron density) to itself.
Explanation:
Answer:
Explanation:
The correct answer is cesium
Because If you look at the electronegativities of just Lithium and Cesium then you would notice that the shielding effect is more prevalent in Cesium, thereby reducing the electronegativity and affecting the reduction potential
Which equation represents positron decay?
Answer: 4
Explanation:
4 is the only one that has to products as well as having the plus at the bottom
Which formula represents an unsaturated hydrocarbon?
Answer:
B
Explanation:
Unsaturated hydrocarbons have a double bond or triple bond between the two carbon atoms (two adjacent carbon atoms to be specifc)
The formula B represent unsaturated hydrocarbon.
What are hydrocarbons?Hydrocarbons are defined as any of a group of organic chemicals made only of the atoms hydrogen (H) and carbon (C). Purely made of carbon and hydrogen, hydrocarbons are by far the most prevalent substance in crude oil, refined petroleum hydrocarbons, coal tar, creosote, dyestuff, and waste products from pyrolysis.
Unsaturated hydrocarbon are defined as hydrocarbons with two or three covalent connections forming between neighboring carbon atoms. Any type of hydrocarbon that has at least one double bond, triple bond, or ring in its carbon chain is referred to as an unsaturated hydrocarbon. As a result, these molecules will contain fewer hydrogen atoms than the maximum number that the carbon chain is capable of supporting.
Thus, the formula B represent unsaturated hydrocarbon.
To learn more about hydrocarbon, refer to the link below:
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You will not measure the enthalpy of the reaction of ______ in the coffee cup calorimeter because this reaction involves gases. Instead, you will use a well-known published value.
HCI and MgO
HCI and Mg
H2 and O2
Answer:
H2 and O2
Explanation:
A coffee cup calorimeter is basically a type of calorimeter that operates at constant pressure. The heat measured in the calorimeter is equal to the change in enthalpy of the reaction.
This type of calorimeter is apt for reactions involving solutions where there is little or no change in volume.
It is not generally applicable to gas phase reactions such as the reaction between H2 and O2.
Answer:
You will not measure the enthalpy of the reaction of
✔ H2 and O2
in the coffee cup calorimeter because this reaction involves gases. Instead, you will use a well-known published value.
C. H2 and O2
Is Correct
HELP ITS IN TBE PICTURE
Answer:
[tex] \small \sf \fbox{Physical Change}[/tex]
Explanation:
Crushing a mineral into powder is a physical change.
How does radon move up through rock and soil?
22)When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen will react
with 2.4 mol of iron ?
4Fe(s) + 3O2(g) → 2Fe2O3(s)
A)1.2 mol
B)1.8 mol
C)2.4 mol
D)3.2 mol
E)4.8 mol
show work
Answer:
B
Explanation:
)When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen will react
with 2.4 mol of iron ?
B)1.8 mol
an atom of an element is represented as 39/19x, write its
(1) number of protons
(2)number of neutrons
(3)Electric configuration
(4)number of valence electrons
Answer:
Solution :
Lithium
Z = 3
P = 3
E = 3 = (2, 1) p=3
A = 7 n=4
P + n = A
3 + n = 7
N = 4

Carbon
Z = 6
P = 6
E = 6 = (2, 4) p=6
A = 12 n=6
P + n = A
6 + n = 12
N = 6
Calculate the total energy, in kilojoules, that is needed to turn a 46 g block
of ice at -25 degrees C into water vapor at 100 degrees C.
Answer: The amount of heat absorbed is 141.004 kJ.
Explanation:
In order to calculate the amount of heat released while converting given amount of steam (gaseous state) to ice (solid state), few processes are involved:
(1): [tex]H_2O (s) (-25^oC, 248K) \rightleftharpoons H_2O(s) (0^oC,273K)[/tex]
(2): [tex]H_2O (s) (0^oC, 273K) \rightleftharpoons H_2O(l) (0^oC,273K)[/tex]
(3): [tex]H_2O (l) (0^oC, 273K) \rightleftharpoons H_2O(l) (100^oC,373K)[/tex]
(4): [tex]H_2O (l) (100^oC, 373K) \rightleftharpoons H_2O(g) (100^oC,373K)[/tex]
Calculating the heat absorbed for the process having the same temperature:
[tex]q=m\times \Delta H_{(f , v)}[/tex] ......(i)
where,
q is the amount of heat absorbed, m is the mass of sample and [tex]\Delta H_{(f , v)}[/tex] is the enthalpy of fusion or vaporization
Calculating the heat released for the process having different temperature:
[tex]q=m\times C_{s,l}\times (T_2-T_1)[/tex] ......(ii)
where,
[tex]C_{s,l}[/tex] = specific heat of solid or liquid
[tex]T_2\text{ and }T_1[/tex] are final and initial temperatures respectively
For process 1:We are given:
[tex]m=46g\\C=2.108J/g^oC\\T_2=0^oC\\T_1=-25^oC[/tex]
Putting values in equation (i), we get:
[tex]q_1=46g\times 2.108J/g^oC\times (0-(-25))\\\\q_1=2424.2J[/tex]
For process 2:We are given:
[tex]m=46g\\\Delta H_{fusion}=334J/g[/tex]
Putting values in equation (i), we get:
[tex]q_2=46g\times 334J/g\\\\q_2=15364J[/tex]
For process 3:We are given:
[tex]m=46g\\C=4.186J/g^oC\\T_2=100^oC\\T_1=0^oC[/tex]
Putting values in equation (i), we get:
[tex]q_3=46g\times 4.186J/g^oC\times (100-0)\\\\q_3=19255.6J[/tex]
For process 4:We are given:
[tex]m=46g\\\Delta H_{vap}=2260J/g[/tex]
Putting values in equation (i), we get:
[tex]q_4=46g\times 2260J/g\\\\q_4=103960J[/tex]
Calculating the total amount of heat released:
[tex]Q=q_1+q_2+q_3+q_4[/tex]
[tex]Q=[(2424.2)+(15364)+(19255.6)+(103960)][/tex]
[tex]Q=141003.8J=141.004kJ[/tex] (Conversion factor: 1 kJ = 1000J)
Hence, the amount of heat absorbed is 141.004 kJ.
3. Which equation shows why nuclear fission can produce a large amount of energy from very little mass?
E= 1/2 mv ^2
E= m^2
E= c^2
E= mc^2
Answer:
E=mc^2 is correct answer, last one
Explanation:
Hope it will help you
Where are turbines used?
O A. Oil wells
O B. Power plants
C. Coal mines
D. Ice caps
Answer:
B. Power plants
A dryer uses 4200 W and operates for 2.50 hours in one day, how much energy is used?
Answer:
37800KJ
Explanation:
Which of the following describes the reactants of a chemical reaction?
A. The substances that dissolve
B. The resulting substances
C. The atoms that are rearranged
D. The original substances
The number of significant figures in 7,000,000.0
Answer:
there are 6
Explanation:
The decimal 0 doesn't count as an SF because there is no point for it.
