Answer:
2.It is released to the surroundings.
Explanation:
In an exothermic reaction, the energy released is to the environment. At the end of the reaction, the surrounding becomes hotter than the system where the reaction is taking place.
Heat is liberated to the surrounding in an exothermic change. At the end of this change, the surrounding becomes hotter. Examples are combustion, dissolution of substances, etc.I will make you brainiest! In this analogy, which part of the lunar cycle is waning - from the new moon to the full moon or the full moon to the new moon?
Answer:
Explanation:
After the glorious appearance of Full Moon, the lunar shape starts to wane, meaning it gets smaller. It's visible later at night and into the early morning, and we see a steadily shrinking shape of the lunar surface that's being lit up.
An object has a mass of 67.4 ounces and a volume of 13.8 cups. What is the density? _______ oz/cup (your answer should *only* be a number, round to one decimal place if needed) *
Answer:
4.9
Explanation:
Given data:
Mass of object = 67.4 ounce
Volume = 13.8 cup
Density = ?
Solution:
d = m/v
d = 67.4 ounce/13.8 cup
d = 4.9 oz/cup
Thus, density of object is 4.9 oz/cup.
Tigers and crocodiles are more closely related than tigers and sharks. Which statement about shared characteristics best supports this statement?
Answer: Crocodiles and tigers both have four legs
Explanation: Even when sharks and tigers are both meat eaters, the question is about similarities between tigers and crocodiles, so D is out. A is about crocodiles and sharks, so it's out also. B suits for sharks too, so it's out too. C is the most suitable answer, because both animals have four legs, which means that they belong to the group of quadrupede animals.
Answer:
Crocodiles and tigers both have four legs
Explanation:
Calculate the amount of heat needed to evaporate 235.0 grams of water from 25.0°C to 100.0°C.
different type of flatbread
A piece of silver is heated and added to a styrofoam cup calorimeter containing 26.0 mL (the density of water is 1 g/mL) of water at 19 oC. The water reaches a maximum temperature of 44 oC after the metal was added. If the specific heat of the silver is 0.240 J/g oC and it started at 93.8 oC
Answer:
m(Ag) = 227.5g
Explanation:
...what is the mass of the piece of silver?
The heat given for the piece of silver is the same heat that is absorbed for the water, that is:
m(Ag)×C(Ag)×ΔT(Ag) = m(Water)×C(Water)×ΔT(Water)
m is mass of water in solution: 26.0mL = 26g of water
And m(Ag) is the mass of Ag, our incognite.
C is specific heat (0.240J/g°C for Ag), and 4.184J/g°C for water
ΔT is change in temperature (93.8°C - 44°C = 49.8°C) for Ag ad (44°C - 19°C = 25°C)
Replacing:
m(Ag)×C(Ag)×ΔT(Ag) = m(Water)×C(Water)×ΔT(Water)
m(Ag)×0.240J/g°C×49.8°C = 26g×4.184J/g°C×25°C
m(Ag)* 11.952J/g = 2719.6J
m(Ag) = 227.5g
2. Atoms of 160, 170, and 180 have the same number of
Have the same number of protons but a different number of neutrons
Further explanationThe elements in nature have several types of isotopes
Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
SO the Three Common Isotopes Of Oxygen :
₈¹⁶O, ₈¹⁷O, and ₈¹⁸O have :
1. The same number of protons = atomic number = 8
2. Have a different number of neutrons :(neutrons= mass number-atomic number)
₈¹⁶O : neutron = 16-8=8
₈¹⁷O : neutron = 17-8=9
₈¹⁸O : neutron = 18-8=10
A mixture contains 20% iron ions by mass. What mass of iron chloride (FeCl) would
you need to provide the iron ions in 50 g of the mixture? A of Fe = 56, A of Cl = 35.5.
.
Mass of iron chloride (FeCl₂) : 22.68 g
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired
[tex]\tt mass~Fe=\dfrac{Ar~Fe}{MW~FeCl_2}\times mass~FeCl_2[/tex]
The iron ions in 50 g mixture :
[tex]\tt 20\%\times 50~g=10~g[/tex]
[tex]\tt 10=\dfrac{56}{127}\times mass~FeCl_2\\\\mass~FeCl_2=22.68~g[/tex]
At a constant temperature, 2L of a gas at 4atm of pressure is expanded to 6L. What is the new pressure? Please show steps!!
Answer:
The answer is 1.33 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{2 \times 4}{6} = \frac{8}{6} = \frac{4}{3} \\ = 1.333333...[/tex]
We have the final answer as
1.33 atmHope this helps you
Choose the coefficient for blank 1 (in front of C)
___ C + ___ S8 --> ___ CS2
2
1
3
4
Answer:
;l ok
Explanation:
How do the farmers use the property of density of cranberries to harvest the crop?
An astronaut leaves Earth's surface and begins orbiting Earth. How will his departure from Earth affect his mass and weight?
Describe two physical properties of matter and how those properties are measured.
-Particle Conversions
How many moles of Lithium are in 7.15 x 1024 atoms of Lithium?
Answer:
The answer is 11.88 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{7.15 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 11.87707641...[/tex]
We have the final answer as
11.88 molesHope this helps you
What is the relishing hip between the chemical energy provided by the battery and the electrical energy produced according to the law of conservation of energy
Answer:
Equal
Explanation:
Energy is always conserved in the nature and it is an universal law. According to the law conservation of energy, it is said that energy can never be created out of something and we can never destroy and vanish any energy in any form. Energy in any form can only be transformed to some other forms of energy. This is known as conversion of energy.
In the context, the chemical energy that is produced by the battery and the electrical energy produced should be equal.
Can you calculate the energy needed to increase the temperature of 100kg of iron by 40°C?
Answer: 177600 J or 177.6kJ
Explanation:
For this problem, we need to use q = mcAT
we have m = 10000, and AT= 40. The specific heat of iron is 0.444.
So now we can plug it in: q = 10000*.444*40 = 177600 J or 177.6kJ
Answer:
1848000J
Explanation:
Given parameters:
Mass of iron = 100kg
Temperature change = 40°C
Unknown:
Energy needed to increase the temperature = ?
Solution:
The amount of energy needed is given by the expression below:
H = m C Δt
m is the mass
c is the specific heat capacity
Δt is the change in temperature
c for iron is 462J/kg°C
Now insert the parameters and solve;
H = 100 x 462 x 40 = 1848000J
The total amount of matter of all of the organisms in an ecosystem is referred to as
What is the mass of 1.794 mol Ba(NO3)2?
Explanation:
Molar mass of Ba(NO3)2 = 261.3368 g/mol
a sample of carbon dioxide gas occupies a volume of 20 L at standard temperature and pressure (STP). what will be the volume of a sample of argon gas that has the same number of moles and but tripled the absolute temperature?
Volume of Argon = 59.972 L
Further explanationIn general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
At STP(0 C, 1 atm), 1 mol gas= 22.4 L
so for 20 L
[tex]\tt \dfrac{20}{22.4}=0.893[/tex]
For Argon
P = 1 atm
T = 273 K x 3 =819 K (tripled)
n = 0.893 (the same number of moles)
R = 0.082 L/atm.mol K
[tex]\tt V=\dfrac{nRT}{P}=\dfrac{0.893\times 0.082\times 819}{1}=59.972~L[/tex]
Calculate the mass of 0.100 mol of calcium
Answer:
4.01 g
Explanation:
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Answer:
helllllooooooo hi how is life
Answer:
hiiii
Explanation:
Which of the following characterizes a reaction at equilibrium?
A reaction comprises a reactant and a product. It is said to be in equilibrium when the rates for the forward and reverse reactions are equal. Thus, option D is correct.
What is an equilibrium reaction?An equilibrium reaction is a thermodynamic condition where the reactants and the products are at a stable position even before and after the reaction. They remain fixed and do not vary with the addition of any catalyst.
In the equilibrium position, the reaction rate of the forward (product formation) and reverse (reactant formation) remains the same and is seen in the reversible reactions only.
The amount of the products and the reactant remains constant till the temperature is constant but may vary if the tempearture is varied.
Therefore, the rate of reverse and forward are equal in the equilibrium reaction.
Learn more about equilibrium reaction here:
https://brainly.com/question/14926771
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A gas is produced when 25 g of substance X is mixed into 60 g of solution Z in a beaker. The mass of the solution in the beaker after the reaction is 75 g. What is the mass of the gas released?
(X + Z -> gas + solution)
mass of the gas = 10 g
Further explanationThe law of conservation of mass :
In a closed / isolated system, the total mass of the substance before the reaction will be equal to the total mass of the reaction product.
Reaction
[tex]\tt X+Z\rightarrow gas+solution[/tex]
mass before reaction=mass after reaction
[tex]\tt 25+60=gas+75\\\\gas=25+60-75=10~g[/tex]
Which container has gas stored at the highest temperature
Answer: 3
Explanation:
Answer:
kinetic energy
Explanation:
may be iam not sure
10 g of copper is heated and the mass increases to 12.5 g. What is the mass of the copper in the new substances? show with steps
Answer:
10 g
Explanation:
The heating of copper can be represented by the following equation:
Cu + 1/2O2 ----> CuO
The new substance is copper oxide, CuO.
From the law of conservation of matter which says that matter can neither be created nor destroyed but be converted from one form to another, it means that barring any loss during heating, all the Cu should be converted to CuO. Hence, the amount of copper in the new substance should remain 10 g.
With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.
Answer:
A. 5 N to the left
Note: The question is incomplete. The complete question is given below:
With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.
What is the direction and magnitude of the resulting force?
A. 5 N to the left
B. 5 N to the right
C. 10 N to the right
D. 10 N to the left
Explanation:
Forces are vector quantities.
Vector quantities are quantities that can be represented both in magnitude and direction.
Forces have both magnitude and direction. Forces can be directed positively or negatively.
For example, in the question above, if forces acting to the right are considered to be in the positive direction, forces acting to the left are considered to be acting in a negative direction.
In the addition of forces, both their magnitude and direction are taken into consideration.
In the example above, taking forces acting to the right as positive and to the left as negative, the sum of the forces is:
Resultant force, F = (5 N) + (-10N)
F = -5 N
Therefore, the net force is 5 N and is directed towards the left
Answer:
5 N to the left
The speed in which the moon orbits the earth is 500 mph.
a. True
b. False
Answer: False
Explanation: The moon travels at 1.42 mph around the Earth.
Answer:
false
Explanation:
The average speeds of gas molecules in cylinders A, B, C, and D are 0.001 m/s, 0.05 m/s, 0.1 m/s, and 0.5 m/s respectively. Which cylinder contains gas that is closest to absolute zero?
Answer:
cylindar a
Explanation:
I took the test
Answer:
A
Explanation:
What is the mass of 0.0467 mol of the element sodium (Na)
Answer:
Explanation:
All periodic tables list different amounts of elemental masses. I'm going to round Sodium to 23
1 mol of sodium = 23
0.0467 mol sodium = x
Cross multiply
1*x = 0.0467 * 23
x = 1.0741 grams
how to determine whether a liquid is pure water or not besides boiling the liquid?
Answer:
Explanation:
Aside the boiling point of water, another colligative property that can be used to identify pure water (or not) is the freezing point. Water freezes at 0 °C, but with the presence of impurities, there is a freezing point depression of the water. Thus, if the water is not pure, the liquid could freeze at a temperature lower than 0 °C (with a negative sign like -8 °C).