During the formation of the sun, gravity pulled matter closer and closer
together until what event occurred?

A. Radioactive decay began.

B. Nuclear fusion reactions began.

C.Neutrons and protons formed.

D. A nebula exploded.

Answers

Answer 1

Answer:

c

Explanation:

cuz


Related Questions

what happens when you burn magnesium in air

Answers

It forms a white powder

Explanation:

Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction.

How much energy is released when 6.0 g of water is condensed from water to vapor?

Answers

Answer:6.0g x 1 mol/18.02g x 40,65 kJ/mol

Explanation: just did the quiz

13.6 kilojoules (kJ) of energy is released when 6.0 g of water is condensed from water to vapor.

To calculate the energy released when 6.0 grams of water is condensed from water to vapor, we need to use the concept of heat of vaporization (also known as enthalpy of vaporization). The heat of vaporization is the amount of energy required to change one gram of a liquid into vapor at its boiling point, without any change in temperature.

The heat of vaporization of water is approximately 40.7 kJ/mol at its boiling point (100°C or 373.15 K). We can use this information to calculate the energy released when 6.0 grams of water is condensed.

Step 1: Calculate the number of moles of water (H₂O) in 6.0 grams.

Molar mass of water (H₂O) = 2 g/mol (for hydrogen) + 16 g/mol (for oxygen) = 18 g/mol

Number of moles of water = Mass of water / Molar mass of water

Number of moles of water = 6.0 g / 18 g/mol = 0.333 moles

Step 2: Calculate the energy released during condensation.

Energy released = Number of moles of water × Heat of vaporization

Energy released = 0.333 moles × 40.7 kJ/mol = 13.6 kJ

Therefore, approximately 13.6 kilojoules (kJ) of energy are released when 6.0 grams of water is condensed from water to vapor.

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*Urgent*
A balloon has a volume of 31.8 L at a temperature of 46 degrees C. What is the new temperature
of the balloon in degrees C if the volume is changed to 49.2 liters?
Round answers to 0.1 decimals

Answers

Answer:

The new volume will be  

0.7 L

Explanation:

This is an illustration of Charles' law, some of the time called the temperature-volume law. It expresses that the volume of a gas is straightforwardly corresponding to the Kelvin temperature, while pressing factor and sum are held steady.  The condition is  V  1  T  1  =  V  2  T  2  , where  V  is volume and  T  is temperature in Kelvins.  Known  V  1  =  0.5 L  T  1  =  20  ∘  C  +  273.15  =  293 K  T  2  =  150  ∘  C  +  273.15  =  423 K  Obscure  V  2  Arrangement  Revise the condition to confine  V  2  . Substitute the known qualities into the condition and address.  V  2  =  V  1  T  2  T  1  V  2  =  (  0.5  L  ×  423  K  )  293  K  =  0.7 L  adjusted to one huge figure

A rubber ball contains .570 mL of gas at a pressure of 2.05 atm. What volume will the gas Couoh at 7.47 atm?

Answers

Answer:

the volume that the gas occupy at 7.47 atm is  0.1564 liters

Explanation:

The computation of the volume that the gas occupy at 7.47 atm is shown below:

As we know that

P1V1 = P2V2

Now

V2 = P1V1 ÷ P2

= 2.05 atm × 0.570 liters ÷ 7.47 atm

= 0.1564 liters

Hence, the volume that the gas occupy at 7.47 atm is  0.1564 liters

So the same would be considered and relevant

6. Which two regions of Earth in the illustration are experiencing winter?
N
Sun
Position
A. Northern and Southern Hemispheres at position A
B. Northern Hemisphere at position A and Southern Hemisphere at position B
C. Northern and Southern Hemispheres at position B
D. Northern Hemisphere at position B and Southern Hemisphere at position A

Answers

Answer:

B

Explanation:

explain why decomposition uses solar energy

Answers

Answer:

Without the sun's energy, biological life would not be able to exist to decompose. Many microbes and fungi do their best work out of direct sunlight.

In an ecosystem, microbes make use of solar energy to decompose dead plant and animals.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.

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Cd(s)+2HCI(aq)---- H2(g)+CdCl2(aq). what volume in liters of 0.81m HCI solution would be needed to fully react with 32.71g Cd. answer only please​

Answers

Answer:

0.718L of 0.81M HCl are required

Explanation:

Based on the reaction:

Cd(s)+2HCI(aq) → H2(g)+CdCl2(aq)

1 mol of Cd reacts with 2 moles of HCl

To solve this question we must, as first, find the moles of Cd. With the moles of Cd we can find the moles of HCl needed to react completely with the Cd. With the moles and the molarity we can find the volume:

Moles Cd -Molar mass: 112.411g/mol-:

32.71g * (1mol / 112.411g) = 0.2910 moles Cd

Moles HCl:

0.2910 moles Cd * (2 moles HCl / 1mol Cd) =

0.5820 moles HCl

Volume:

0.5820 moles HCl * (1L / 0.81moles) =

0.718L of 0.81M HCl are required

A full moon appears on July 1: On what date is the next full moon likely to appear in the night sky?

А July 15
B July 29
C August 14
D August 28

Answers

I’d say B but that’s just me

A full Moon chances roughly every 29.5 days, so it may be possible the next full moon likely to appear in the night sky of Earth on July 29, hence the option B is correct.

The lunar phase during which the Moon is completely lit from Earth's viewpoint is known as the full moon.

When Earth is situated halfway between the Sun and the Moon, this happens. This indicates that the near side of the moon, which faces Earth, is fully illuminated by the sun and appears as a roughly round disc.

A full Moon chances roughly every 29.5 days, so it may be possible the next full moon likely to appear in the night sky on July 29.

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What is the equilibrium constant for the chemical equation:

1. N2 (g) + 3H2 (g) ↔ 2NH3 (g)

At equilibrium, the concentration of N2 is 2.5 x 10-4 M, the concentration of H2 is 6.4 x 10-3 M, and the concentration of NH3 is 5.3 x 10-2 M.

Write out the equilibrium constant, Keq, and show you work.

2. Mg3P2 (s) ↔ 3Mg+2 (aq) + 2P-3 (aq)

At equilibrium, the concentration of Mg3P2 is 5.5 x 10-6 M, the concentration of magnesium ions is 7.2 x 10-5 M, and the concentration of phosphide ions is 9.8 x 10-8 M.

Write out the equilibrium constant, Keq, and show you work.

Answers

Answer:

beaner

Explanation:

Answer:

x= 1 /5 y+ 4 /5

Explanation:

Let's solve for x.

10x−2y=8

Step 1: Add 2y to both sides.

10x−2y+2y=8+2y

10x=2y+8

Step 2: Divide both sides by 10.

10x /10 = 2y+8 /10 x= 1 /5 y+ 4 /5

what is the mass of an electron?
0 amu
1 amu
2 amu
dependent upon the type of element
PLEASE HELP

Answers

Answer:

the answer is 0 amu I hope it helps

3.
Which quantity of salt will form an
unsaturated solution in 100 g of water
at 50°C?
(1) 43 g of KCI
(2) 50 g of NH4Cl
(3) 100 g of KNO,
(4) 116 g of NaNO,

Answers

Answer:

Option D, 116 g of NaNO3

Explanation:

An unsaturated solution is the one in which the amount of salt dissolved in more than the maximum amount of salt that can be dissolved in it.

At 50 degree Celsius, 37 grams of salt can be dissolved in 100 ml of water. Hence, 116 gram of salt is the correct answer

What is the difference between the reaction of CH3COOH with H20 and with OH?​

Answers

Answer:

Explanation:  CH3COOH(aq) + H2O(l) ↔ CH3COO-(aq) + H3O+(aq) acid base ... sulfuric acid can react with either OH- or. H.

Adiabatic process is a process in which _ is constant (a) temperature (b)volume (c)pressure (d) heat

Answers

Answer: Adiabatic process is a process in which heat is constant

Explanation:

The processes in which temperature remains constant is called isothermal process.

The process in which Volume remains constant is called isochoric process.  

The process in which pressure remains constant is called isobaric process.

 The process in which no heat is gained or lost by the system, Hence heat remains constant is called as adiabatic process.

Thus option d) heat is correct

Tyrone mixes some chemicals together. He notices that the mixture gives off heat and is hot to touch. What type of reaction is this?
A. Physical
B. Chemical
C. Polar Bear
D. Solution

Answers

chemical, if it gives off a reaction like that its chemical

Please help me with this homework

Answers

Answer is gas for sure and I think it’s ice for question 2

What amount of heat is released when the temperature of 450.0 g of a
substance drops by 7.1 °C? Assume that the specific heat = 1.264 J/g.°C

Answers

Answer:

[tex]\boxed {\boxed {\sf 4038.48 \ Joules}}[/tex]

Explanation:

Since we are given the mass, specific heat, and change in temperature, we should use this formula for heat:

[tex]q=mc\Delta T[/tex]

The substance's mass is 450.0 grams, the specific heat is 1.264 J/g°C, and the  change in temperature is 7.1 °C.

[tex]m= 450.0 \ g \\c= 1.264 \ J/g \textdegree C\\\Delta T= 7.1 \ \textdegree C[/tex]

Substitute the values into the formula.

[tex]q= (450.0 \ g)(1.264 \ J/g \textdegree C)(7.1 \ \textdegree C)[/tex]

Multiply the first 2 values together. The grams will cancel out.

[tex]q= 568.8 \ J/ \textdegree C (7.1 \ \textdegree C)[/tex]

Multiply again. This time, the degrees Celsius cancel out.

[tex]q= 4038.48 \ J[/tex]

4038.48 Joules of heat energy are released.

Periodic table 50 elements with thier valancies​

Answers

Answer:

The first 50 elements along with their valences are given below :

1. Hydrogen = 1

2. Helium = 0

3. Lithium = 1

4. Beryllium = 2

5. Boron = 3

6. Carbon = 4

7. Nitrogen = 3

8. Oxygen = 2

9. Fluorine = 1

10. Neon = 0

11. Sodium = 1

12. Magnesium = 2

13. Aluminium = 3

14. Silicon = 4

15. Phosphorus = 3

16. Sulphur = 2

17. Chlorine = 1

18. Argon = 0

19. Potassium = 1

20. Calcium = 2

21. Scandiun = 3

22. Titanium = 3

23. Vanadium = 4

24. Chromium = 3

25. Manganese = 4

26. Iron = 2

27. Cobalt = 2

28. Nickel = 2

29. Copper = 2

30. Zinc = 2

31. Gallium = 3

32. Germanium = 4

33. Arsenic = 3

34. Selenium = 2

35. Bromine = 1

36. Krypton = 0

37. Rubidium = 1

38. Strontium = 2

39. Yttrium = 3

40. Zirconium = 4

41. Niobium = 3

42. Molybdenum = 3

43. Technetium = 7

44. Ruthenium = 4

45. Rhodium = 3

46. Palladium = 4

47. Sliver = 1

48. Cadmium = 2

49. Indium = 3

50. Tin = 4

Note :

An element like Iron, copper can have more than one valencies.

Answer:

50 elements chemical eq, atomic number, atomic mass, no.of electrons, no.of protons, no.of neutrons, electronic configuration and valancies are given in the above attachment

Explanation:

Hope it helps you

4.6 moles of a gas are at a temperature of 325 K and a volume of 96.8 L, what is the pressure of the gas

Answers

Answer:

1.27atm is the pressure of the gas

Explanation:

Using combined gas law, we can find the pressure of a gas with the moles, temperature and volume of the gas. The formula is:

PV = nRT

P = nRT / V

Where P is pressure in atm

n are the moles of the gas: 4.6 moles

R is gas constant: 0.082tamL/molK

T is absolute temperature: 325K

V is volume: 96.8L

Replacing:

P = 4.6mol*0.082atmL/molK*325K / 96.8L

P = 1.27atm is the pressure of the gas

Why is knowing where volcanoes and earthquakes occur important?
Please help!!!!!

Answers

Studying earthquakes will help you learn where they might occur and how you can prepare for their hazards.
so that you can be safe and can prepare in case it happens.

Organelle X is a -
A.
mitochondrion, which makes energy for the cell.
B.
ribosome, with carries proteins within the cell.
C.
centriole, which helps divide the cell in two.
D
lysosome, which helps digest substances inside the cell.

Answers

Answer:

A.

Explanation:

Please answer the question

Answers

Answer: c

Explanation:

1. How many molecules are there in 24 grams of iron (III) fluoride?​

Answers

1.2x1023 molecules Answer

Balance the following skeletal equation:
Li(s) + H2O(1) -------> -------> LiOH(aq) + H2(g).

Answers

Answer:

I think above answer is fully correct. Mark it brainliest

How many molecules are in 6.20 moles of CaCO3?

Answers

1 mole is equal to 1 moles CaCO3, or 100.0869 grams.

What is mole?

A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created.

The mole is a SI unit that is used to quantify any quantity of a substance. The word "mole" is shortened to "mol".

A mole consists of precisely 6.022140761023 particles. The "particles" could be anything, from tiny things like electrons or atoms to enormous things like stars or elephants.

Therefore, 1 mole is equal to 1 moles CaCO3, or 100.0869 grams.

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1. Pressures up to 3000 bar are measured with a dead-weight gauge. The piston diameter is 4 mm. What is the approximate mass in kg of the weights required

Answers

Answer:

The approximate mass of the weight required is 348.3 kg

Explanation:

The dimensions of the dead-weight gauge are;

The pressure up to which the dead-weight gauge measures, P = 3,000 bar

The diameter of the piston of the dead-weight gauge, D = 4 mm = 0.004 m

The dead-weight gauge pressure formula is given as follows;

Pressure, P = The weight applied, W ÷ The area the weight is applied, A

∴ The weight applied, W = P × A

Where;

P = Pressure

A = The area the weight is applied

W = The weight applied to the piston

The area the weight is applied, A = The area of the piston = π·D²/4

Where;

D = The diameter of the piston

∴ A = π × (0.004 m)²/4

When P = 3,00 bar, and A = π × (0.004 m)²/4, we have;

The weight applied, W = P × A

∴ W = 3,000 × π × (0.004 m)²/4 ≈ 3,769.9118 N

W ≈ 3,769.9118 N

W = m·g

Where;

m = The mass of weight

g = The acceleration due to gravity ≈ 9.81 m/s²

m = W/g

∴ m = 3,769.9118 N/(9.81 m/s²) ≈ 384.3 kg

The approximate mass of the weight required, m = 348.3 kg.

We started by Solving for the force and then the area of the piston, we then applied the formula for force using the constant for acceleration due to gravity and the mass was found to be 384.34 kg

Given Data

Pressure = 3000 bar

Diameter = 4mm

Let us convert bar to N/mm^2

1 bar = 0.1 N/mm^2

3000 bar = x N/mm^2

= 0.1*3000

= 300 N/mm^2

We know that pressure P = Force/Area

Let us find the area of the piston

Area = πd^2/4

Area = 3.142*4^2/4

Area = 3.142*16/4

Area = 50.272/4

Area = 12.568 mm^2

Let us find the force F

F = P*Area

F = 300*12.568

F = 3770.4 Newton

We know that Force = Mg

g = 9.81 m/s^2

Hence, m = F/g

m = 3770.4/9.81

m = 384.34 kg

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A student lives in a place that receives lots of snow and ice during the winter. The student has observed that the highway department spreads salt on the road after a snowfall. Which of the following correctly explains why the highway department uses salt on the roads?

Salt lowers the freezing point of water, which makes the melted snow on the road less likely to form ice.

Salt raises the freezing point of water, which makes the melted snow on the road less likely to form ice.

Salt raises the vapor pressure of water, which makes the melted snow more likely to evaporate before it freezes.

Salt lowers the osmotic pressure of water, which makes the melted snow more likely to be absorbed into the ground before it freezes.

Answers

Answer:

Salt lowers the freezing point of water, which makes the melted snow on the road less likely to form ice.

Answer:

A

Explanation:

Edge.

Why do North and South Pole have different winter times?

The two poles have different location.
North Pole is found in the Western Hemisphere.
The tilt of the Earth towards the Sun changes throughout the year.
North Pole is found in the Northern Hemisphere.

Answers

Answer:

Explanation:

Both the Arctic (North Pole) and the Antarctic (South Pole) are cold because they don't get any direct sunlight. The Sun is always low on the horizon, even in the middle of summer. In winter, the Sun is so far below the horizon that it doesn't come up at all for months at a time.

Answer:

The tilt of the Earth towards the Sun changes throughout the year.

Explanation

The standard molar enthalpy of vaporization for water is 40.79kJ/mol. What mass of steam is required to release 500 kJ of energy upon condensation?

Answers

Answer:

220.9g of water are required

Explanation:

The molar enthalpy of vaporization is defined as the heat released when 1 mole of water changes from liquid to gas.

For water, 1 mole releases 40.79kJ. To release 500kJ are necessaries:

500kJ * (1mol / 40.79kJ) = 12.26 moles are necessaries

To convert moles to grams we must use the molar mass (H2O = 18.02g/mol):

12.26 moles * (18.02g / 1 mol) =

220.9g of water are required

Un Hidrocarburo de peso molecuar 42g/mol contiene un 85,7 de carbono, ¿cual es la formula empirica y molecular?

Answers

Answer:

1 respuesta. fórmula empírica = CH2

Explanation:

Translatation: 1 Answer. empirical formula = CH2

Guys im going to be going over these with my teacher tomorrow so please help me if u have a little bit of humanity inside you ASAP

Answers

Answer:

5. Amplitude.

6. 344.8 meters/second

Explanation:

5. The energy is proportional to the amplitude is all I remember. Sorry :/ Been a long time since I took these classes.

6. Traveling to the wall & back is 200m

100 + 100 = 200m total traveled

The time is 0.58s so, we can use the speed formula to solve [ s = d/t ] where s = speed, d = distance, and t = time.

s = 200/0.58

s = 344.82758

I don’t know if they’ll have you round, but I would say the speed of the sound is 344.8 m/s.

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