Answer:
70.27 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{4.23 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 70.265780...[/tex]
We have the final answer as
70.27 molesHope this helps you
which two elements have the same number of valence electrons?
Answer:
A and B
Explanation:
please mark me as brainliest
Which of the following natural factors is likely to support the formation of an oceanic island?
Erosion of undersea stalagmites and stalactites
Erosion of the face of a cliff by waves
Rising of magma from the seafloor
Rising sea level in low-lying areas
Answer:
i would say c, magma rising from the seafloor
Answer:
Your answer would be C
Explanation: Props to the guy above he did write it first
What is the relationship between the amount of sugar added and the amount of CO2 gas produced?
A. there is no relationship between amount of sugar added and carbon dioxide gas/size of balloon.
B. if more sugar is added, more carbon dioxide gas is produced, making the balloon larger
C. if more sugar is added, less CO2 gas is produced, making the balloon smaller
TRUE OR FALSE
The products are the molecules that are produced in a reaction.
Answer:
true
Explanation:
the new substances formed as a result of a chemical reaction are called products
Will award 25 points!! And give out brainliest :))
Answer:
# of protons is 95
# of neutrons is 147
Hope this helps!
Explanation:
Answer:
Protons: 95
Neutrons: 148
- Protons and electrons are equal
- To find the amount of neutrons, subtract the amount of protons/electrons from the atomic number
David is making an omelet. She breaks some eggs into a bowl and uses a fork to beat the eggs. Then, she mixes shredded cheese into the eggs. Finally, she pours the mixture into a hot pan and cooks it until it forms a solid omelet. During which step does a chemical change occur? (7 Points)
David breaks eggs into a bowl.
David uses a fork to beat the eggs.
David makes a mixture of eggs and cheese.
David cooks the mixture of eggs and cheese until it forms a solid.
Answer:
the forth one i think
Explanation:
what is the specific heat of a 25.0 g substance that absorbs 493.4 j and raises the temperature from 12.0°c to 34°c?
Answer:
Specific heat of substance = 0.897 J/g.°C
Explanation:
Given data:
Specific heat of substance = ?
Mass of substance = 25.0 g
Heat absorbed = 493.4 J
Initial temperature = 12.0 °C
Final temperature = 34°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 34°C -12.0°C
ΔT = 22°C
493.4 J = 25 g ×c× 22°C
493.4 J = 550 g.°C ×c
c = 493.4 J / 550 g.°C
c = 0.897 J/g.°C
What’s the answer? I need it ASAP
Answer:
i got c. 57.6 yds
Explanation:
hope u get it right
good luck
A cell contains the same DNA as its parent cell. This is a result of which process? mitosis meiosis gamete formation fertilization
Answer:
Mitosis
Explanation:
A cell that contains the same DNA as its parent cell is a product of mitosis.
Mitosis is a cell division process that takes place in somatic cells. In meiosis a single cell divides to produce two daughter cells each having the same DNA as the parentMitosis ensures that the same DNA is found between the parentMitosis is used for repairing and production of new cells.Answer:
Mitosis
Explanation:
I AM SO CONFUSED PLEASE HELP:(
When ice at 0°C melts to liquid water at 0°C, it absorbs 0.334 kJ of hear per gram. Suppose the heat needed to melt 49.5 g of ice is absorbed from the water contained in a glass. If this water has a mass of 0.219 kg and a temperature of 21.0°C, what is the final temperature of the water? Assume the specific heat is that of pure water, 4.18 J/(g-°C). (Note that you will also have 49.5 g of water at 0°C from the ice.)
When ice at 0°C melts to liquid H2O, it absorbs 334 J per gram. The specific heat of water is 4.184 J g– 1 deg–1.
The final temperature of the water is equal to 2.94 °C.
What is the heat capacity?Heat capacity can be described as the amount of heat needed to change the heat content of one mole of material by 1°C. Specific heat is the amount of heat needed to change the heat content of 1 gram of a material by 1°C.
The heat energy is absorbed by a substance, and its temperature increases. The rise in the temperature for each substance is different for different substances therefore, they have different heat capacities.
Given, the mass of the ice = 49.5 g
the mass of water, m= 0.219 Kg
The specific heat of water,Cp = 4.18 J/(g.°C)
The change in the temperature of the water, ΔT = (T - 21)°C
The heat absorbed by ice = 49.5 × 0.334 KJ = 16.53 KJ
The heat lost by water = 219 × 4.18 × (T - 21)
The heat absorbed by ice = The heat lost by water
-16.53 KJ = 219 × 4.18 × (T - 21) J
- 16530 = 915.42 (T-21)
T-21 = - 18.06
T = 2.94 °C
Therefore, the final temperature of the water is 2.94 °C.
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What action is modeled by the diagram? Explain
The action modeled by the diagram is; flow of ions ( cations and anions ) in a cell/compound
The diagram is used to represent the flow of control ( flow of ions ) in a system, it is similar to a data flow diagram, because the start, direction and endpoint of an activity diagram is the similar to that of a data flow diagram. Activity diagrams are also used to generally describe the steps in a use case system as seen in the diagram attached in the question.
Hence the diagram ( activity ) represents the flow of ions in a compound
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What volume (in L) of carbon dioxide will
be produced from the reaction of 11.8L
of ethane (C2Ho)?
2C2H6(g) + 702(g) + 4CO2(g) + 6H2O(g)
The volume of carbon dioxide produced from 11.8 L ethane at STP is 22.4 L.
What is STP?The STP can be given as the standard temperature and pressure. The standard temperature is 25° C and 1 atm.
It is known that, 22.4 L of gas at STP is equivalent to 1 mole.
Thereby, concentration of ethane is:
22.4 L = 1 mole
11.8 L = 1/22.4 * 11.8 moles
11.8 L = 0.5 moles
From the balanced chemical equation:
2 moles ethane produce = 4 moles carbon dioxide
0.5 moles ethane produce = 4/ 2* 0.5 moles carbon dioxide
0.5 moles ethane produce = 1 moles carbon dioxide
The volume of 1 mole of gas at STP is 22.4 L. Therefore, 11.8 L ethane produces 22.4 L carbon dioxide.
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what did hooke find in his research
Answer:Robert Hooke, (born July 18 [July 28, New Style], 1635, Freshwater, Isle of Wight, England—died March 3, 1703, London), English physicist who discovered the law of elasticity, known as Hooke’s law, and who did research in a remarkable variety of fields.
Explanation:
In 1655 Hooke was employed by Robert Boyle to construct the Boylean air pump. Five years later, Hooke discovered his law of elasticity, which states that the stretching of a solid body (e.g., metal, wood) is proportional to the force applied to it. The law laid the basis for studies of stress and strain and for understanding of elastic materials. He applied these studies in his designs for the balance springs of watches. In 1662 he was appointed curator of experiments to the Royal Society of London and was elected a fellow the following year.
One of the first men to build a Gregorianreflecting telescope, Hooke discovered the fifth star in the Trapezium, an asterism in the constellation Orion, in 1664 and first suggested that Jupiter rotates on its axis. His detailed sketches of Mars were used in the 19th century to determine that planet’s rate of rotation.
How many zeroes are significant in the measurement 0.0400200?
Answer:
4
Explanation:
if the 0 is in the beginning it is not significant.
0 in between are always significant.
the 0 at the end are only significant if theres a decimal.
When the first American astronauts were planning to walk on the Moon, they knew that the gravity on the Moon was less than the gravity on Earth. With this information, what did the astronauts expect to be MOST different on the Moon? Select one: a. their mass b. their height c. their weight d. their volume
Answer:
Their weight.
Explanation:
Weight is the measurement of gravity pushing you down, so with less gravity there would be less weight.
The astronauts expect their weight to be different on the Moon
Definition of weightWeight is simply defined as the gravitational pull of the earth on an object. It is measured in Newton.
Description of weightThe weight of an object varies with location because of gravity.
The weight of an object is related to it's mass according to the following equation:
Weight = mass × Acceleration due to gravity
Since the gravity of the Moon is lesser than that of the Eearth, the astronauts certainly knew that their weight will be different on the Moon.
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Just need help with this last question
its electrical energy -------> light and heat
Hope this helps
mark brainliest if helpful
Answer:
C
Explanation:
Potential energy is obtained by an object's positioning so the first and last choice cannot be correct.
Of course the electrical energy is not destroyed so that one's not correct either.
The energy conversion that takes place must be electrical energy to light and heat.
Complete Table G to view the effect of surface area on the rate of reaction by transferring your data from Tables D and E to Table G.
Which form of the sodium bicarbonate tablet dissolves the fastest?
- Whole Tablet
- Quartered Tablet
- Crushed Tablet
Answer:
The answer would be
crushed tablet
Explanation:
just took the test on edg2020
Answer:
Crushed Tablet
Explanation:
Which statement is true about
radiation?
A. Radiation is the transfer of heat
through electromagnetic waves
B. Radiation is the transfer of heat
through direct contact
C. Radiation is more dangerous than
conduction
The statement i.e. true is A. Radiation is the transfer of heat
through electromagnetic waves
The following information should be considered:
Radiation refer to the energy that arrived from a source and travels via space at the speed of light. This energy should contain the electric field and a magnetic field associated with it.Learn more: https://brainly.com/question/994316?referrer=searchResults
Helium is part of group 8A, explain why helium fits with the pattern and why it is slightly different.
Helium is slightly different because this element only has 2 electrons on it.
I'm not sure though just search it if you want an accurate one.
How is the mode of a data set defined?
It is the middle value of the set.
It is the most common value in the set.
It is the average of the different values in the se
It is the difference between the highest and lowe
What is the standard cell notation of a galvanic cell made with magnesium
(Mg) and gold (Au)?
Answer:
Mg(s) | Mg2 + (aq) Au + (aq) | Au(s)
Explanation:
The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² + (aq) Au + (aq) | Au(s).
Thus, The cathode is the location of reduction, while the anode is the location of oxidation. The identity of the electrodes in a real cell depends on the direction that the net cell reaction is taking place.
If, during spontaneous operation, electrons move from the left electrode to the right electrode (as shown in the cell notation above), the right electrode's potential will be higher than the left electrode's, and the cell potential will be positive.
The direction of "conventional current flow" goes from positive to negative, which is the reverse of how electrons move. This means that a galvanometer installed in the external circuit would show a positive reading if the electrons are flowing from the left electrode to the right.
Thus, The standard cell notation of a galvanic cell made with magnesium (Mg) and gold (Au) Mg(s) | Mg² (aq) Au + (aq) | Au(s).
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Which of the following is a Halogen??
Answer:
Bromine
Explanation:
It's the halogen color on the periodic table of elements.
Answer:
Bromine
Explanation:
at what points do the object change direction
Answer:
i think its B C and D.........
Which of these is a helpful interaction that harms no animal
Answer:
It's mutualism I am pretty sure
I hope this helps :)
What do you think our solar system consists of?
Answer:
planets,stars and lots more
Answer: Our solar system consists of the stars, the Sun, the planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune), dwarf planets such as Pluto, many moons, and a bunch of asteroids, comets and meteoroids!
Explanation:
How can you relate the blocks in the periodic table and the numbers of its column into the electron configuration
Answer:
The elements are listed by atomic number (the number of protons in the nucleus), and elements with similar chemical properties are grouped together in columns.
Problem #2: A photographic "stop bath" contains 160mL of pure acetic acid,
HC H20 in 650ml solution. What is the v/v concentration of acetic acid
in the stop bath?
Answer:
100008
Explanation:
The v/v concentration of 160ml pure acetic acid in 650ml solution is 24.61 %.
There is 160ml of pure acetic acid in the 650 ml solution of acetic acid.
The volume/volume concentration of acetic acid can be calculated as:
Volume/Volume = [tex]\rm \frac{volume\;of\;acetic\;acid}{Volume\;of\;solution}\;\times\;100[/tex]
v/v = [tex]\rm \frac{160}{650}\;\times\;100[/tex]
v/v = 0.2461 [tex]\rm \times[/tex] 100
v/v = 24.61 %
The concentration of pure acetic acid in the 650 ml solution is 24.61 % (v/v).
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Atoms which lose electrons and become electrically charged are called ____.
fussion particles
ions
electrolytes
fission particles
Answer:
ions
Explanation:
When an atom gains or loses an electron, it becomes an ion. Ions formed by the loss of an electron have a positive charge, and those formed by gaining an electron have a negative charge. Positive ions are called cations, and negative ions are called anions. Cations and anions are attracted to each other.
An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. not an atom.
Answer:
ions
Explanation:
it was a easy answer
What is the density of a cylinder with a mass of 65.34g, a height of 15.60 cm and a radius of 1.34 cm?
Answer:
d = 0.743 g/cm³
Explanation:
Given data:
Mass of cylinder = 65.34 g
Height = 15.60 cm
Radius = 1.34 cm
Density of cylinder = ?
Solution:
Volume of cylinder:
V = πr²h (π = 22/7)
V = 88 cm³
Density of cylinder:
d = m/v
d = 65.34 g / 88 cm³
d = 0.743 g/cm³
Why solid heat faster than liquid?
A. Because the molecules of solid are far to each other
B. Because the molecules of solid are close to each other
C. Because the molecules of solid are not moving.
D. Because the molecules of solid are very small.
please answer me the correct answer
Answer:
The answer is B. The molecules of a solid are close to each other