Answer:
The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
The amount of heat that a body receives or transmits is determined by the following expression:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
This expression indicates that between heat and temperature there is a direct proportional relationship.
In this case:
Q= 100 Jc= ?m= 5 gΔT= Tfinal - Tinitial= 40 °C - 10 °C= 30 °CReplacing:
100 J= c*5 g* 30°C
Solving:
[tex]c=\frac{100 J}{5 g* 30C}[/tex]
c= 0.67 [tex]\frac{J}{g*C}[/tex]
The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]
In which phase of a substance do its particles have the greatest average kinetic energy?
Answer:
Gas
Explanation:
Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.
BRAINLIEST :)()()(
The particles in the gaseous phase of a substance have the greatest average kinetic energy.
What is the average kinetic energy?The average kinetic energy refers to the kinetic energy accompanied by the maximum number of molecules whereas total kinetic energy is the kinetic energy of the total number of moles of gas molecules.
The total kinetic energy of molecules in a gas is determined by using the following formula,
Total Kinetic Energy = (3/2)nRT
Where R is the gas constant, n is the number of moles of gas, and T is the temperature of the reaction.
At any given temperature, all of the molecules of a sample do not have the same kinetic energy. Instead of that, the particles show a wide range of kinetic energies.
The average kinetic energy of the particles in the solid phase is the least and the particles or molecules in the gaseous phase have the greatest average kinetic energy.
Learn more about average kinetic energy, here:
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You can scratch graphite with your fingernail. What does this tell you about graphite? A. It breaks easily. B. It’s not very hard. C. It’s not very lustrous. D. It doesn’t have much texture.
Answer:
A and B
Explanation:
Graphite (like in a pencil) is a material that can easily be smudged and shaded just by smudging it a little. Therefore I believe it's A or B
Answer:
Its C
Explanation:
A volume of 5.0 L of air at 20°C is expelled from a container where it is instantly warmed to 50°C. Calculate the new volume that the air occupies at this temperature.
Answer: The new volume that the air occupies at this temperature is 5.5 L
Explanation:
To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.
We are given:
[tex]V_1=5.0L\\T_1=20^oC=(20+273)K=293K\\V_2=?\\T_2=50^0C=(50+273)K=323K[/tex]
Putting values in above equation, we get:
[tex]\frac{5.0}{293}=\frac{V_2}{323}\\\\V_2=5.5L[/tex]
Thus the new volume that the air occupies at this temperature is 5.5 L
Mosquitoes lays eggs that must hatch in water. The young, called larvae live their first few days in water
Which sentence best describes where you will most likely find mosquitoes and their eggs during the dry season in the Florida Everglades?
A.They will be spread out because water is everywhere.
B.They will be mainly in one area because water is everywhere
C. They will be in fewer areas because water is scarce
D. They will be everywhere because water is scarce.
Answer:
Explanation:
I believe he is C
What is one thing NOT impacted by Acid
Rain.
Granite
Metal
Limestone
Fossil fuels, like coal, oil, and natural gas, are huge, carbon-rich deposits that essentially trapped carbon for millions of years (until humans started burning them for energy).
True or False
Answer:
True!
Explanation:
Fossil fuels are carbon based compounds present deep in the earth left millions of years ago.
hope it helps!
Over long periods of time, some species have become extinct, while new species have
descended from earlier species. These changes are known as:
Evolution
Mutation
Natural selection
Adaption
Answer:
Adaption
The reason why its adaption is because some species become extinct due to not adapting to world changes, while newer species can adapt to world changes.
Hope this helps!
measure the mass of a truckful of grain, use:
kiloliters
kilometers
grams
tons
Help
Answer:
tons
Explanation:
An ideal gas, such as helium, is in a sealed container made of hard steel. If the container is heated, what would happen to the gas trapped inside the container?
Group of answer choices
The volume of the gas will decrease
The pressure of the gas will increase
The volume of the gas will increase
The pressure of the gas will decrease
Answer:
The correct answer is The pressure of the gas will increase
The volume of the gas will increase
Explanation:
Step 1: Data given
The gas in a container is heated, this means the temperature increases
Suppose we start with a temperature of 100 K and a pressure of 1 atm and a volume of 1L
Step 2:
V1/T1= V2/T2
⇒V1 = the initial volume = 1L
⇒T1 = the initial temperature = 100 K
⇒V2 = the new volume = TO BE DETERMINED
⇒T2 = the increased temperature = 200 K
1/100 = V2 / 200
V2 = 2 L
This means when the temperature increases, the volume will increase
P1/T1 = P2/T2
⇒P1 = the initial pressure = 1 atm
⇒T1 = the initial temperature = 100 K
⇒P2 = the new pressure = TO BE DETERMINED
⇒T2 = the increased temperature = 200 K
1/100 = P2 / 200
P2 = 2 atm
This means when the temperature increases, the pressure will increase
The correct answer is The pressure of the gas will increase
The volume of the gas will increase
Frosted glass and wax paper are ____.
A) transparent
B) translucent
C) clear
D) opaque
Answer:
B) translucent
Explanation:
Light only partially passes through them.
Which of these defines a volcano?
A. An undersea rift that can cause the ocean floor to move
B. A mountain on Earth's crust through which molten material leaves the mantle
C. A large pile of rocks and other debris that turn into liquid when heated
D. An extremely tall collection of liquid metals that harden when cooled
Answer:
B
Explanation:
aight imma let you guys i
Answer:
b
Explanation:
it is right
Relate dark matter to the development of the universe after the Big Bang. In 3-5 sentences, speculate on how the development of the universe would have been different if there had been no dark matter. In your answer, use the term structures.
Please answer this and ill mark you as brainliest
Answer:
Dark matter also called baronic matter is the matter that makes up 27% of the universe.
In 1933 it was determined as that mass that cannot be seen, that is, the non-visible mass of outer space.
Dark matter also plays a central role in the formation of structures and the evolution of galaxies and has measurable effects on the anisotropy of cosmic microwave background radiation. The composition of this matter is unknown today.
The dark matter component has considerably more mass than the "visible" component of the Universe.
Explanation:
There are certain researchers who say that the appearance of dark matter was before the appearance of the big bang.
A relevant fact of this matter is that dark matter exerts gravity, and that gravity affects the movements of objects.
Despite the fact that nothing is known about its origin, astronomers have amply demonstrated that dark matter plays a determining role in the formation of galaxies and galactic clusters, which could not maintain their cohesion without its existence, but many doubt that it is the remainder / remnant or product of a big bang.
The volume of an air bubble at the bottom of a lake is 1.35 mL. If the pressure at the bottom of the lake is 125 kPa and the air pressure at the top of the lake is 105 kPa, what will the volume of the bubble be when it rises to the surface?
Answer:
1.61 mL
Explanation:
Step 1:
Data obtained from the question. This includes the following:
Initial volume (V1) = 1.35 mL
Initial pressure (P1) = 125 kPa
Final pressure (P2) = 105 kPa
Final volume (V2) =..?
Step 2:
Determination of the volume of the air bubble at the surface of the lake.
This can be obtained by use the Boyle's law equation as follow:
P1V1 = P2V2
125 x 1.35 = 105 x V2
Divide both side by 105
V2 = (125 x 1.35)/105
V2 = 1.61 mL
Therefore, the volume of the air bubble at the surface of the lake is 1.61 mL
Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?
higher temperature → more kinetic energy → more space between particles – higher volume
higher temperature → less kinetic energy → less space between particles higher volume
o higher temperature → more kinetic energy → less space between particles → lower volume
higher temperature → less kinetic energy → more space between particles lower volume
Answer:
higher temperature → less kinetic energy → less space between particles higher volume
Explanation:
a _____ is substance in which one or more atoms have the same number of protons (I.e. the same atomic number)
Answer: Element
Explanation:
Answer: a proton is substance in which one or more atoms have the same number of protons
Using the diagram of the forces on an airplane, which arrow represents the force of gravity?
A) A
B) B
C) C
D) D
Answer:
Is there a diagram that you can post
Answer:
D
Explanation:
Usatestprep :)
How did Robert Goddard contribute to space exploration?
He was the first person in space.
He was the first person to walk on the moon.
He was the first person to use liquid fuel for rockets.
He designed and built the first space station.
Answer:
He was the first person to use liquid fuel for rockets.
1. What are the trends for atomic size across a period and down a group for the
main group elements?
2. Draw the following Lewis structures:
a) ammonium ion b) sulfur trioxide c) hydrogen cyanide
3. Using formal charge formula (or electronegativity differences), to determine
the following the best structure, OCS, COS or CSO.
Answer:
Here's what I get
Explanation:
1. Trends in atomic size
Atomic size tends to decrease from left to right across the Periodic Table.
You are adding one electron at a time. the electrons repel each other, so the size should increase.
You are also adding a proton to the nucleus. The additional attraction should pull the electrons closer to the nucleus.
The nuclear pull wins, so the atoms get smaller from left to right
Atomic size increases from top to bottom of a Group.
You are adding electrons to an extra shell, so the size should increase.
You are also adding protons to the nucleus, so the size should decrease.
The size of the outer shell wins, so the atomic size increases going down a Group.
2. Lewis structures
(a) Ammonium ion
N is the central atom. The N atom has the positive charge.
(b) Sulfur trioxide
S is the central atom, with a double bond to each of the three O atoms.
(c) Hydrogen cyanide
C is the central atom, with a triple bond to the N atom.
3. COS
The best structure is that of O=C=S. It has no formal charges.
The Lewis structures for the other arrangements have formal charges.
The correct answers of this question is given below.
1. The atomic size increases going down a Group.2. (a) Ammonium ion : The N atom has the positive charge. (b) Sulfur trioxide : Having double bond to each of the three O atoms. (c) hydrogen cyanide : Having a triple bond to the N atom.3. COS and it has no formal charges What is Periodic table?A table in which the chemical elements are arranged in order of increasing atomic number.A periodic table has 118 known elements The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number.What is the explanation for this answers?1. Trends in atomic size : Atomic size tends to decrease from left to right across the Periodic Table.You are adding one electron at a time. the electrons repel each other, so the size should increase.You are also adding a proton to the nucleus. The additional attraction should pull the electrons closer to the nucleus.The nuclear pull wins, so the atoms get smaller from left to right.Atomic size increases from top to bottom of a Group.Adding electrons to an extra shell, so the size should increaseAdding protons to the nucleus, so the size should decrease.The size of the outer shell wins, so the atomic size increases going down a Group.2. Lewis structures :
(a) Ammonium ion : N is the central atom. The N atom has the positive charge. (b) Sulfur trioxides : S is the central atom, with a double bond to each of the three O atoms.(c) Hydrogen cyanide: C is the central atom, with a triple bond to the N atom3. COS
The best structure is that of O=C=S. It has no formal charges.The Lewis structures for the other arrangements have formal charges.Learn more about atomic size below,
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The arrow signifies?
A. Nothing
B. Movement from left to right
C. reaction has occurred
Answer:
The correct answer would be C.
What is the primary role of the United States Bureau of Counterterrorism?
о
to plan counterterrorist attacks
to create active counterterrorism groups
to encourage domestic counterterrorism activities
to advance counterterrorism efforts in other countries
o advance counterterrorism efforts in other countries
Answer:
D
Explanation:
E2020
The strong nuclear force is always smaller than the electrostatic force true or false
Answer:
False
Explanation:
The Strong Nuclear Force is defined as an attractive force between neutrons and protons which is responsible to hold the nucleus together.
Electrostatic force is the repulsive or attractive force between two electrically charged objects.
Strong nuclear force is always greater than electrostatic force but changes with the distance. Strong nuclear attraction keeps the nucleus of an atom together in a small space as well which is stronger than their electrostatic repulsion.
it is said that, the strong nuclear force is the strongest force in the universe.
Hence, the given statement is false.
Answer:
False
Explanation:
Strong nuclear forces are much higher than the electrostatic repulsive force. In case if these strong nuclear forces would have not been there, then the nucleus would have disintegrated. This is so because only gravity cannot keep hold on these particles. The nuclear force varies with the size of nucleus. As the size of nucleus increases, the electrostatic repulsion becomes greater
Hence, the given statement is false
What causes eclipses? select three options
Answer:
The first, second, and 4th option
Explanation:
what is an example of a strong base?
HCl
NaCl
NaOH
HF
Answer:
The answer is NaOH
Explanation:
Strong bases are characterized by the fact that they dissociate completely in an aqueous solution. In this case, sodium hydroxide, NaOH, is classified as a strong base because it dissociates completely in an aqueous solution to form sodium cations, Na+, and hydroxide anions, OH−. Also, it is strong because it totally breaks in its ion. And the base which breaks totally in its atom called the strong base and which doesn't it that is a weak base.
Answer:
NaOH
Explanation:
Got it right in the test. Please mark as brainliest
What is the pH of a 6.50 x 10-3 M KOH solution?
Answer:
11.81
Explanation:
We'll begin by writing the balanced dissociation equation for KOH. This is given below:
KOH —> K+ + OH-
Next, we shall determine the concentration of Hydroxide ion, [OH-]. This is illustrated below:
From the balanced equation above,
We can see that 1 mole of KOH produced 1 mole of OH-.
Therefore, 6.50x10^-3 M KOH will also produce 6.50x10^-3 M OH-.
Next, we shall determine the pOH of the solution. This is illustrated below:
pOH = –Log [OH-]
[OH-] = 6.50x10^-3 M
pOH = –Log 6.50x10^-3
pOH = 2.19
Finally, we can determine the pH of the solution as follow:
pH + pOH = 14
pOH = 2.19
pH + 2.19 = 14
Collect like terms
pH = 14 – 2.19
pH = 11.81
Therefore, the pH of the solution is 11.81
The pH of a 6.50 x 10-3 M KOH solution is 11.81 which is alkaline.
pH is a measure of how acidic or basic a solution is. Ph has a range from 0 to 14. pHs with less than 7 show acidity, while a pH of greater than 7 indicates a base/ alkalinity. , pH of 7 shows the solution is neutral.
KOH is a strong base, Upon dissociation,it gives
KOH -> K⁺ + OH⁻
Here, 1 mole of KOH produced 1 mole of OH-.
Therefore, 6.50 x 10-3 M KOH will prodce 6.50 x 10-3 M H
Now, we first determine the pOH of the solution with the equation:
pOH = –Log [OH-]
[OH-] = 6.50x10^-3 M
pOH = –Log 6.50x10^-3
pOH = 2.19
Now, we know that
pH + pOH = 14
Having gotten that
pOH = 2.19,
pH + 2.19 = 14
pH = 14 – 2.19
pH = 11.81
Therefore, the pH of the KOH solution is 11.81 which is alkaline.
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PLEEASE HELP TIMED WILL GIVE BRAINLIEST TO CORRECT ANSWER NLY PLEASEEEE HELPPPP
Answer:
1) 1.15 mol
2) M=0.45
3) 22.5 mL
4) 6.25 mL
Explanation:
1)
550 mL= 0.55 L
M= mol solute/ L solution
mol solute= M * L solution
mol solute= (2.1 M * 0.55 L ) M=1.15 mol solute
2)
155 mL = 0.155 L
80 g -> 1 mol NH4NO3
5.61 g -> x
x= (5.61 g * 1 mol NH4NO3)/80 g x= 0.07 mol NH4NO3
M=(0.07 mol NH4NO3)/0.155 L M=0.45
3) M1V1=M2V2
V1= M2V2/M1
V1= (0.500 M * 0.225 L)/5.00 M V1=0.0225 L =22.5 mL
4) M1V1=M2V2
V1= M2V2/M1
V1= (0.25 M * 0.45 L)/ 18.0 M
V1=6.25 x 10^-3 L = 6.25 mL
Answer:
?
Explanation:
How many moles of potassium nitrate are required to make 550 mL of a 2.1M solution?
Answer:
1.155 moles of potassium nitrate are required to make 550 mL of a 2.1M solution.
Explanation:
In a mixture, the chemical present in the greatest amount is called a solvent, while the other components are called solutes.
Molarity is a unit of concentration of a solution and indicates the amount of moles of solute that appear dissolved in each liter of the mixture. In other words, the Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a given volume.
The Molarity of a solution is determined by the following expression:
[tex]Molatity( M)=\frac{number of moles of solute}{Volume}[/tex]
Molarity is expressed in units ([tex]\frac{moles}{liter}[/tex]).
In this case:
Molarity= 2.1 Mnumber of moles of solute= ?Volume= 550 mL= 0.550 L (being 1L=1000 mL)Replacing:
[tex]2.1 M= 2.1 \frac{moles}{liter} =\frac{number of moles of solute}{0.550 liters}[/tex]
Solving:
number of moles of solute= 2.1 M* 0.550 L
number of moles of solute= 1.155 moles
1.155 moles of potassium nitrate are required to make 550 mL of a 2.1M solution.
I need the answers to this question please
The options are
A.0.17g/cm^3
B.5.38g/cm^3
C.0.05g/cm^3
D.8g/cm^3
Answer:
Before submerged 150ml
After submerged: 180ml
rock volume: [tex]180 - 150 = 30[/tex]
formula for density:
[tex] \frac{mass}{volume} = 5.38 [/tex]
[tex] \frac{175}{30} = 5.38 [/tex]
THE ANSWER IS b
prettty sure this is wrong but eh :/ probably correct
The addition of heat causes the individual particles of a solid to
Answer:
Move rapidly or move fast and farther apart. Hope this helps.
Answer: vibrate more rapidly
Explanation:
Why is soap mixed with water?
O A. The soap turns the water molecules into a nonpolar solvent.
B. It covalently bonds to the water so it can be washed away.
O C. Its polar end mixes with the water so it can be washed away.
D. The soap becomes chemically active when mixed with water.
Answer:
Explanation:
Soap breaks up the oil into smaller drops, which can mix with the water. It works because soap is made up of molecules with two very different ends. One end of soap molecules love water - they are hydrophilic. The other end of soap molecues hate water - they are hydrophobic.
Answer:
C. Its polar end mixes with the water so it can be washed away.
Explanation:
Just took test
