Answer:
About 28.9 kJ.
Explanation:
Recall the formula for specific heat:
[tex]\displaystyle q = mC\Delta T[/tex]
Where q is the amount of heat released, m is the mass of the substance, C is its specific heat, and ΔT is the change in temperature.
Therefore, by substitution, we have that:
[tex]\displaystyle \begin{aligned} q & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right) \left(82.1^\circ\text{C}-30.7^\circ \text{C}\right) \\ \\ & = (625\text{ g})\left(\frac{0.900 \text{ J}}{\text{g-$^\circ$C}}\right)\left(\frac{1 \text{ kJ}}{1000 \text{ J}}\right)(51.4^\circ\text{C}) \\ \\ & = 28.9\text{ kJ}\end{aligned}[/tex]
In conclusion, about 28.9 kJ of energy is needed.
Which element has the same electron configuration as the following:
1s22s22p63s23p64s23d104p64d25s2
PLEASE HELP SERIOUS ANSWERES ONLY
What weakness does the following question have? How many alligators live in the Everglades National Park?
1.The question is not answerable through observation.
2.The question cannot be answered with our current technology.
3.The question is too broad.
4.The question needs to focus more on a relationship instead of just numbers.
Answer:
4. The question needs to focus more on a relationship instead of just numbers.
Explanation:
One of the characteristic of a good research questions that the answer to that question should be able to be used to make a certain decision. Without this, the question would be considered as useless.
The answer to the question "How many alligators live in the Everglades National Park?" will not provide you with any useful information. Only non-useful fact. We need to make a little adjustment to make the answer becomes useful.
For example, Let's say that we alter the question to;
"How littering contribute to the number of Alligators that live in the Everglades National Park?'
The answer to that question will provide us with something that we can use to make a decision. Let's say we find out that littering lead to decreasing number of alligators. We can use this data to convince the legislators to increase the budget to clean up the national park.
Explanation:
What is the best method for separating food dyes
Can somebody give me 2 answers and make sure there correct thx!!!
(WILL MARK BRAINLIEST)
:D
/google or whatever u can use to answer)
Answer:
The theory of Biological Evolution makes two very bold claims about living creatures: First: All living things on earth are related. They evolved from a common ancestor. Second: The evolution of living things is powered by natural processes. Things which can be studied and understood
Explanation:
How many moles are in 28.2 grams of sodium?
O 648 moles
O 1.69 moles
O 1.23 moles
O 7.38 moles
Take the given weight (28.2 g) and divide it by the atomic weight of sodium.
The atomic mass can be found under the element symbol on the periodic table. The atomic mass for sodium is 22.98 g.
28.2/22.98 = 1.23 moles
Therefore, there are 1.23 moles in sodium.
Murcury is the only metal at room temperature. Its density is 13.6g/mL. How many grams of murcury will occupy a volume of 95.8mL? Answer in scientific notation.
Answer:
The answer is 1.30288 × 10³ gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 95.8mL
density = 13.6g/mL
We have
mass = 13.6 × 95.8 = 1302.88
We have the final answer as
1.30288 × 10³ gHope this helps you
If a beach ball has a volume of 261 L at a temperature of 502 K, what will be the new
temperature of the balloon if the volume decreases to 176 L? Formula: V/T, -V2/T2
The new temperature of the balloon if the volume is decreased to the given amount is 338.5K.
Charles's law
Charles's law states that the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
Given the data in the question;
Initial volume; [tex]V_1 = 261L[/tex]Initial temperature; [tex]T_1 = 502K[/tex]Final volume; [tex]V_2 = 176L[/tex]Final Temperature; [tex]T_2 = \ ?[/tex]
To determine the new temperature as the volume is decrease, we substitute our given values into the expression above.
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\\\V_1T_2 = V_2T_1\\\\261L * T_2 = 176L * 502K\\\\261L * T_2 = 88352L.K\\\\T_2 = \frac{88352L.K}{261L}\\ \\T_2 = 338.5K[/tex]
Therefore, the new temperature of the balloon if the volume is decreased to the given amount is 338.5K.
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11. To “see” the spaces in matter, add one cup of______. The total volume is ______.two cups, since alcohol has a lot of______ between molecules, where water molecules can_______.
According to the forces of attraction, to “see” the spaces in matter, add one cup of alcohol.The total volume is less than two cups, since alcohol has a lot of spaces between molecules, where water molecules can fill.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Atoms of which pair of elements will form metallic bonds in a compound?
Answer: Ti and Ni
Explanation:
The bond line formula,
represents the molecular formula
A
C₂ H18
C₃H15
Answer:
C8H18
Explanation:
The end carbons have 3 hydrogen atoms each and the ones in the middle have 1 hydrogen atom each which gives. (3 x 5) + (1 x 3) = 18 hydrogen atoms
Guys pls help me it's urgent
Will make brainlist
Answer:
a) 2KOH -> K2O + H20
Explanation:
The second one I dont know. but for the 1st part I'm sure 100%
Describe the properties of ammonium lauryl sulfate that make it a feasible surfactant. Properties can include strength, conductivity, solubility, reactivity, durability, and state of matter.
The properties of ammonium lauryl sulfate that make it a feasible surfactant is its solubility and being able to disrupt hydrogen bonding in water.
What is a Surfactant?They are used as detergents and emulsifiers through to their ability to reduce surface tension between substances.
Hydrogen bonds are the primary contributor to the high surface tension of water which is why their ability to disrupt it makes it to be a good surfactant.
Read more about Surfactant here https://brainly.com/question/2968498
What is the name of this hydrocarbon?
a) A skeletal model starts with C H 3 at the left, goes down to a valley, up to a peak, and then down again.
b) The valley and the peak have C H 3; there is also a C H 3 on a line straight down from the end of the centerline of carbons. 2,3-dimethylpentane 3,4-dimethylbutane 3,4-diethylpentane 2,3-diethylbutane
Answer:
A. 2,3-dimethylpentane
Explanation:
edge 2022
Hydrocarbons are the simplest compound containing carbon and hydrogen in their molecular structure. 2, 3 dimethyl pentane is correct.
What is hydrocarbon ?Hydrocarbons are the simplest compound containing carbon and hydrogen in their molecular structure. There are four types of hydrocarbon as follows
Alkanes, alkenes, alkynes and aromatic hydrocarbons. Alkane contai carbon carbon single bond in their structure .Alkene containing carbon carbon double bond in their structure while alkynes contain carbon carbon triple bond in their structure.
Aromatic hydrocarbon contain benzene ring in their structure. Benzene is the example of aromatic hydrocarbon. Aromatic hydrocarbons are used as paint removal and are also used as a solvents.
Thus, 2, 3 dimethyl pentane is correct . It is a hydrocarbon containing carbon and hydrogen in their structure.
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a 26.4 g sample of copper has a specific heat capacity of "0.3845" j/g c°. the copper is heated to 225°c and then cooled to 0°c. how much energy
Taking into account the definition of calorimetry, the energy released is 2283.93 J.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
In this way, between heat and temperature there is a direct proportional relationship. the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q: the heat exchanged by a body of mass m. c: specific heat substance. ΔT: the temperature variation.Energy releasedIn this case, you know:
Q= ?c= 0.3845 [tex]\frac{J}{gC}[/tex]m= 26.4 gΔT= Tfinal - Tinitial= 0°C - 225 °C= -225 CReplacing in the definition of calorimetry:
Q = 0.3845 [tex]\frac{J}{gC}[/tex]× 26.4 g× (-225 C)
Solving:
Q= -2283.93 J
Finally, the energy released is 2283.93 J.
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Butane (C4H10) reacts with oxygen in the air
to form carbon dioxide and water. How many
moles of carbon dioxide can be formed from
1.25 mol butane and excess oxygen?
Taking into account the reaction stoichiometry, 5 moles of CO₂ can be formed from 1.25 mol butane and excess oxygen.
Reaction stoichiometryIn first place, the balanced reaction is:
2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₄H₁₀: 2 moles O₂: 13 moles CO₂: 8 molesH₂O: 10 molesMoles of CO₂ formedThe following rule of three can be applied: if by reaction stoichiometry 2 moles of C₄H₁₀ form 8 moles of CO₂, 1.25 moles of C₄H₁₀ form how many moles of CO₂?
[tex]moles of CO_{2} =\frac{1.25 moles of C_{4} H_{10}x8 moles of CO_{2}}{2 moles of C_{4} H_{10}}[/tex]
moles of CO₂= 5 moles
Then, 5 moles of CO₂ can be formed from 1.25 mol butane and excess oxygen.
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I’ll give the Brainliest
Choose the correct statement about the Moon.
A) Scientists now believe the Moon is a dwarf planet captured by Earth nearly 4.2 billion years ago.
B)The Moon's diameter is about one half that of Earth and the gravity one quarter of Earth.
C) The Moon is nearly as large as Earth but with a gravity 1/6 that of Earth.
D) The Moon's diameter is one quarter that of Earth and the gravity is 1/6 that of Earth.
Answer:
D. is the Answer. ✅
Explanation:
The Moon is 1/4 the size of Earth.
A is not right because Moon isn't a dwarf planet.❌
B is not right because the Moon isn't 1/2 the size of Earth.❌
C is not right because the Moon is no where near as large as Earth.❌
Answer:
D
Explanation:
The moon is not as nearly as large as the Earth so C is out
The diameter of the moon is not about 1/2 of Earth so B would cancel out
The moon is not a dwarf planet so A would cancel out
D is the answer. Hope this helps!
What technique would you use to separate alcohol from water?
please help!!!!!
Answer:
fractional distillation.
Explanation:
Electron, Proton, Neuron
which one do they carry, No charge, Positive,Negative
choose which is theirs!
i forgot lol:) soemoen psl
Explanation:
Electron is negative in charge
Proton is positive in charge
Neutron has no charge
Calcium chloride is used to make pickles. The calcium atom transfers electrons to chlorine atoms, leading to the formation of chemical bonds. Calcium chloride contains
____ bonds.
a.covalent
b.ionic
c.metallic
Copper atoms are used to produce pennies. The copper atoms in pennies share many electrons. Pennies contain
_____ bonds.
a.covalent
b.ionic
c.metallic
Hydrochloric acid is the main acid that helps break down food in the stomach. The atoms of hydrochloric acid share electrons. Hydrochloric acid contains
_____bonds.
a.covalent
b.ionic
c.metallic
Answer:
Ionic
Covalent
ionic.............
Can somebody please give me an answer for this question that doesn't consist of building or construction?
Answer:
to build a house you need land and people
Explanation:
What is the mass of 0.80 moles of Mg? (1 point)
a
7.5 x 1023 grams
b
4.8 x 1023 grams
c
30 grams
d
19 grams
Answer:
m = 19 grams
Explanation:
Given that,
No. of moles, n = 0.8
The molar mass of magnesium, M = 24.305 u
We need to find the mass of 0.80 moles of Mg. We know that given mass to the molar mass is equal to no of moles. Let the mass is m. So,
[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=0.8\times 24.305 \\\\m=19.444\ \text{grams}[/tex]
or
m = 19 grams
So, the mass of 0.8 moles of Mg is 19 grams.
What is the pressure (in millimeters of mercury) inside a container of a gas connected to an open-end manometer when the level in the arm connected to the container is 203.3 mm in height lower than the level in the arm open to the atmosphere? Atmospheric pressure is 757.1 mm Hg and the density of mercury is 13.546 g/mL.
Answer:
See explanation below
Explanation:
In this case, you just need to apply the following expression:
Pc = Patm + h + d1/d2
Where:
Pc: Pressure of container
Patm: Atmospherical pressure
h: height of the arm of manometer
d1: density of gas
d2: density of mercury
You are not providing the density of the gas which is filled the container, so, let's assume we are filling this with hexane (d = 0.65 g/mL)
We have all in mm Hg so we just need to apply the above expression:
Pc = 757.1 + 203.3 * (0.65/13.546)
Pc = 757.1 + 9.7553
Pc = 766.8553 mmHg
PLEASE HELP WILL GIVE BRAILIST!!!
b) Type one to two paragraphs that describe your models and relate them to the law of
conservation of mass. Your document should:
i. identify the names of the reactants and products in the reaction.
ii. identify the number of molecules that make up the reactants and products.
iii. identify the type and number of atoms in each molecule of the reactants and products.
iv. explain what happens during the chemical reaction.
v. explain how mass is conserved during the chemical reaction
Answer:
The first one is on google
Explanation:
The mass of an object is 18g and its volume is 9 cm3 Sink Float
Which of these answers describes a scientific law?
A) an interesting idea based on various scientific opinions
B) a well-supported and widely accepted explanation of
nature
C) a specific relationship under given conditions in the
natural world
D) an explanation of why particular events happen in the
natural world
an explanation of why particular events happen in the natural world
Why do you Think you weight less on Uranus than earth even though it is more massive planet ? 
Answer:
You would weigh less on Uranus than on Earth because Uranus is far less mass-ive and dense than the Earth. This means that there is less gravity. Therefore, you would weigh less.
Explanation:
Even though Uranus is bigger, it is less massive; that is, there is less mass that makes up the planet. The volume of the planet might be larger, but the actual amount of mass isn't.
By the way, you couldn't stand on Uranus. It's made of gas!
In an exercise to teach students how to use an analytical balance, the instructor gives a student a one dirham coin which has been pre-weighed ( accepted value)as 4.6026 g. The weight that the student obtains for the same one dirham coin is 4.6013 g. What is the percentage error in the students' reading
Answer:
0.028%
Explanation:
From the question given above, the following data were obtained:
Accepted value = 4.6026 g
Measured value = 4.6013 g.
Percentage error =..?
Thus, we can obtain the percentage error in the student's reading as follow:
Percentage error = |measured value – accepted value|/accepted value × 100
Percentage error = |4.6013 – 4.6026| / 4.6026 × 100
Percentage error = 0.0013 / 4.6026 × 100
Percentage error = 0.13/4.6026
Percentage error = 0.028%
Therefore, the percentage error in the student's reading is 0.028%
In what process is carbon transformed into chemical energy?.
Answer:
Photosynthesis !
Explanation:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
Hi!, please help :)
Answer:
5.8
Explanation:
i need all the answers ASAP
Answer:
explanation
Explanation:
Magnesium-
a. Solid
b. Metal
c. Natural
d. Mg
e. Alkaline earth metals
Ill answer the rest if you can mark brainliest
help Sound ________ because the vibrating object makes nearby particles vibrate.
A. Intensifies
B. Travels
C. Stays still
D. Gets louder
Answer:
i think its B
Explanation:
When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules. This “chain reaction” movement, called sound waves, keeps going until the molecules run out of energy