Well, the big bang theory was that the universe started to expand at and extrmly fast rate. We're talking several billion kilometers in less than a second. People think that our univers was pretty much shot out into space in a ciertain direction. During this, the univers has expanded and widen't to unimaginable size. but we really don't know what happend, and we may never find out. Who knows?
According to the traditional Big Bang theory, the universe's creation involved a singularity, a region of infinite density and temperature whose nature is difficult for humans to comprehend.
What is big bang theory ?A physics theory called the Big Bang event explains how the cosmos grew from a highly dense and hot starting condition. The evolution of the observable universe from the earliest known times through its succeeding large-scale form is explained by several cosmological models of the Big Bang.
Everything in the cosmos was compressed into a singularity, a point of infinite heat and density, around 13.7 billion years ago. Our cosmos suddenly began to expand explosively, expanding faster than the speed of light.
Belgian Catholic priest, theoretical physicist, mathematician, astronomer, and professor of physics Georges Lemaître is credited with developing the theory itself. The notion was initially supported by Hubble's Law of the universe's expansion.
Thus, in the traditional Big Bang theory, the universe's creation involved a singularity.
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Which atom is involved in giving your heart energy to beat
Answer:
I think it is oxygen
Hope it helps :)
Are scientific theories all proven facts?
Answer:
Any scientific theory must be based on a careful and rational examination of the facts. Facts and theories are two different things. In the scientific method, there is a clear distinction between facts, which can be observed and/or measured, and theories, which are scientists' explanations and interpretations of the facts.
Explanation:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results.
Which one of the following is a common acid? A. Antacid
B. Wasking soda
C. Aspirin
D. Soap
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Answer:
C. Aspirin
Explanation:
If you are using A pex, this is the correct answer.
Reasoning: Soap is not an acid so thats out of the question. I'm not sure if washing soda or antacid are acidic but even if they were, Aspirin is definitely an acid and is way more commonly used than those two.
Caculate the pH of a solution that has a hydrogen ion concentration of 0.0025
Answer:
The pH of the solution is 2.60.
Explanation:
The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:
pH = -log (H30 +)
pH= -log (0,0025)
pH=2.60
What is the difference between the 3 types of solar eclipses
based on how they occur? ILL OUT YOU AS BRANILEST
Answer:
Hi There The correct answer There are 3 kinds of solar eclipses: total, partial, and annular. There is a rare hybrid that is a combination of an annular and a total eclipse.
Hope it helps!
Answer:
There are 3 kinds of solar eclipses: partial, total, and annular.
Total EclipseA total solar eclipse occurs when the Moon completely covers the Sun, as seen from Earth.
Partial EclipseThis one happens when the moon covers part of the sun.
Annular EclipseAn annular solar eclipse occurs when the Moon appears smaller than the Sun as it passes centrally across the sun and leaves a ring of light around the moon.
Give Brainliest if you please
How is the solubility of carbon dioxide gas in water increased?
by stirring the mixture
by increasing the pressure
by using more solvent
by increasing the temperature
Answer:
by increasing the temperature
What is the mass of oxygen that can be produced from 2.79 moles of lead(ll) nitrate
1.38 moles of oxygen
Explanation:
Thermal decomposition of Lead (II) nitrate is shown by the balanced equation below;
2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂
The mole ration of Lead (II) nitrate to oxygen is 2: 1
Therefore 2.76 moles of Lead (II) nitrate will lead to production of? moles of oxygen;
2: 1
2.76: x
Cross-multiply;
2x = 2.76 * 1
x = 2.76 / 2
x = 1.38
How many representative particles are in 1.45 g of a molecular compound with a molar mass of 237 g?
Answer: 3.68 x 10^21 particles
Explanation:
Based on Avogadro's law:
1 mole of any substance has 6.02 x 10^23 atoms
Since 1 mole is the same as molar mass of a substance
237 g = 6.02 x 10^23 atoms
1.45g = Z atoms
To get the value of Z, cross multiply:
(Z atoms x 237g) = (6.02 x 10^23 atoms x 1.45g)
237Z = 8.729 x 10^23
Z = (8.729 x 10^23 / 237)
Z = 3.68 x 10^21
Thus, there are 3.68 x 10^21 representative particles in 1.45 g of the molecular compound.
To find the number of representative particles in 1.45 g of a substance with a molar mass of 237 g/mol, first calculate the number of moles by dividing the mass by the molar mass, then multiply by Avogadro's number. The calculation shows there are approximately 3.69 × 10²± representative particles.
Explanation:To calculate the number of representative particles in 1.45 g of a molecular compound with a molar mass of 237 g/mol, we need to use Avogadro's number and the concept of molar mass.
First, we determine the number of moles in 1.45 g:
Number of moles = mass (g) / molar mass (g/mol) = 1.45 g / 237 g/mol.
After finding the number of moles, we use Avogadro's number (6.02 × 10²³ particles/mol) to find the number of representative particles:
Number of particles = number of moles × Avogadro's number.
Therefore, we would calculate:
1.45 g / 237 g/mol = 0.0061180 moles.
Number of particles = 0.0061180 moles × 6.02 × 10²³ particles/mol.
After performing the multiplication, we find:
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which of these questions could a testable hypothesis be developed?
Answer:
Explanation:
Does the width of a rubber band affect how far it will stretch?
How does the thickness of a material affect insulation?
Do all objects fall to the ground at the same speed?
Answer:
sorry can you please add the questions
Explanation:
but to identify an hypothesis is when before the experiment you are gonna put what you think might happen
In a closed system at 40°C, a liquid has a vapor
pressure of 50 kPa. The liquid's normal boiling
point could be
(1) 10°C
(3) 40°C
(2) 30°C
(4) 60°C
The question pertains to the normal boiling point of a liquid, which is the temperature at which its vapor pressure equals 1 atm (101.3 kPa). Given the vapor pressure is 50 kPa at 40°C, the normal boiling point must be higher than 40°C, making 60°C the correct answer.
Explanation:The question concerns the normal boiling point of a liquid, which is defined as the temperature at which a liquid’s vapor pressure equals the atmospheric pressure. In a closed system at 40°C, a liquid has a vapor pressure of 50 kPa, but the normal boiling point occurs when its vapor pressure reaches 101.3 kPa, the typical atmospheric pressure. Given that the vapor pressure of the liquid at 40°C is less than 101.3 kPa, and knowing that vapor pressure increases with temperature until it reaches atmospheric pressure (allowing the liquid to boil), the liquid's normal boiling point must be higher than 40°C. Therefore, the answer is (4) 60°C, as it’s the only option provided that is higher than 40°C.
And atom that has fewer neutrons and protons and more electrons than protons is a what ion
Hey there!
The two types of ions are anions and cations.
Anions are negative and cations are positive (cheesy, but CAT-ions are PAWS-itive helps me remember).
If there are more electrons than protons, then the negative charge will be higher than the positive charge. So, the ion will overall be negative.
This means the atom is an anion.
Hope this helps!
An organism's unique characteristics affect the individual's ability to survive in its environment. true or false
Answer:
True
Explanation:
what did you include in your response? check all that apply.
Answer:
click all of the boxes
Explanation:
10 POINTS PLEASE HELP ASASP WILL MARK BRANLIEST
Which of the following statements regarding the influence of organisms on rocks is true?
A.
Rocks can be neither formed nor altered by the activity of organisms.
B.
Rocks can be formed and altered by the activity of organisms.
C.
Rocks can only be altered by the activity of organisms.
D.
Rocks can only be formed by the activity of organisms.
Answer:
B. Rocks can be formed and altered by the activity of organisms
Explanation:
At what temperature will 2.40 moles of chlorine gas exert a pressure of 2.70 atm at a volume of 0.750 L?
Answer:
—262.71°C
Explanation:
Step 1:
The following data were obtained from the question:
Number of mole (n) = 2.4 moles
Pressure (P) = 2.70 atm
Volume (V) = 0.750 L
Temperature (T) =?
Gas constant (R) = 0.082atm.L/Kmol
Step 2:
Determination of the temperature.
Using the ideal gas equation, the temperature can be obtained as follow:
PV = nRT
2.7 x 0.750 = 2.4 x 0.082 x T
Divide both side by 2.4 x 0.082
T = (2.7 x 0.750) /(2.4 x 0.082)
T = 10.29K
Step 3:
Conversion of Kelvin temperature to celsius temperature.
Temperature (celsius) = temperature (Kelvin) - 273
temperature (Kelvin) = 10.29K
Temperature (celsius) = 10.29 - 273
Temperature (celsius) = —262.71°C
Answer:
10.28Kelvin
Explanation:
Using the ideal gas equation;
PV = nRT
P is the pressure
V is the volume of the gas
n is the number of moles
T is the temperature in Kelvin
R is the Gas constant
Given n = 2.4moles
P = 2.70atm
V = 0.750L
R = 0.0821atm.L/mol.K
From the formula above:
T = PV/nR
T = 2.70×0.750/2.4×0.0821
T = 2.025/0.197
T = 10.28K
What is the only thing held constant in a combined gas law problem?
Only the amount of gas is held constant.
What does molarity tell us that percent solution information does not tell us?
Answer:
Molarity tell us about the concentration of moles of solute in a solution.
Explanation:
Chemical substances are measured in terms of mole. Mole is defined as the amount of substance which contains 6.022×10²³ particles, ions or atoms. In System of international, amount of substance is measured in moles. So molarity tells us more information about amount of solute in a solution as compared to percent solution.
Answer:
Molarity tell us about the concentration of moles of solute in a solution.
Explanation:
.
what happens to entropy during this dissolving process.
Answer:
The process of dissolving increases entropy because the solute particles become separated from one another when a solution is formed.
Harry uses a pulley to pull up a bucket of water from a well. He uses chemical energy in his body to apply mechanical energy to the system. Which of the following energy transformations also occurs as the bucket rises?
In pulling up a bucket of water, Harry uses chemical energy converted into mechanical energy, which transforms into gravitational potential energy as the bucket rises.
Explanation:When Harry pulls up the bucket of water from the well using a pulley, a number of energy transformations occur. Initially, he uses the chemical energy in his body (obtained from the food he eats) to apply mechanical energy to the system (pulley and bucket). As the bucket begins to rise, the mechanical energy is transformed into gravitational potential energy. This is similar to water at a higher elevation having a higher potential energy than water at a lower elevation.
This process demonstrates a key principle in physics: energy is conserved and can be transferred or transformed from one form to another, but is never lost. So in this case, the chemical energy in Harry's muscles is converted into mechanical energy, which in turn is transformed into gravitational potential energy as the bucket is lifted higher in the well.
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Calculate the pH of a solution prepared by mixing 25.00 mL of 0.155 M Ca(OH)2
solution with 35.00 mL of 0.112 M HCl solution
Answer:
pH of solution is: 12.82
Explanation:
The reaction of hydrochloric acid with calcium hydroxide is:
Ca(OH)₂ + 2 HCl → H₂O + CaCl₂
Where 2 moles of hydrochloric acid react with 1 mole of calcium hydroxide
Moles of HCl and moles of Ca(OH)₂ are:
Moles HCl:
0.02500L × (0.155mol / L) = 3.875x10⁻³moles HCl
Moles of Ca(OH)₂:
0.03500L × (0.112mol / L) = 3.92x10⁻³moles Ca(OH)₂
Moles of Ca(OH)₂ that react are:
3.875x10⁻³moles HCl × (1 mol Ca(OH)₂ / 2 mol HCl) = 1.9375x10⁻³ mol Ca(OH)₂
Thus, moles of Ca(OH)₂ that remain are:
3.92x10⁻³moles Ca(OH)₂ - 1.9375x10⁻³ mol Ca(OH)₂ = 1.9825x10⁻³ mol Ca(OH)₂
Moles of OH⁻ are:
1.9825x10⁻³ mol Ca(OH)₂ × (2mol OH⁻ / 1mol Ca(OH)₂) = 3.965x10⁻³ mol OH⁻
As volume is 25mL + 35mL = 60mL ≡ 0.060L. Molar concentration of OH⁻ is:
3.965x10⁻³ mol OH⁻ / 0.060L = 0.066M OH⁻.
pOH = -log [OH⁻]
pOH = 1.18
pH = 14-pOH
pH of solution is: 12.82
Answer:
pH = 12.80
Explanation:
Step 1: data given
Volume of a 0.155 M Ca(OH)2 = 25.00 mL = 0.025 L
Volume of a 0.112 M HCl = 35.00 mL = 0.035 L
Step 2: The balanced equation
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
Step 3: Calculate moles
Moles = molarity * volume
Moles Ca(OH)2 = 0.155M * 0.025 L
Moles Ca(OH)2 = 0.003875 moles
Moles HCl = 0.112 M * 0.035 L
Moles HCl = 0.00392 moles
Step 4: Calculate the limiting reactant
For 1 mol Ca(OH)2 we need 2 moles HCl to produce 1 mol CaCl2 and 2 moles H2O
HCl is the limiting reactant. It will completely be consumed. (0.00392 moles) Ca(OH)2 is in excess. There will react 0.00392 / 2 = 0.00196 moles
There will remain 0.003875 - 0.00196 = 0.001915 moles Ca(OH)2
Step 5: Calculate molarity of Ca(OH)2
Molarity = moles / volume
Molarity Ca(OH)2 = 0.001915 moles / (0.060 L)
Molarity Ca(OH)2 = 0.0319 M
For 1 mol Ca(OH)2 we have 2 moles OH-
Molarity of OH- = 2*0.0319 = 0.0638 M
Step 6: Calculate pH
Since Ca(OH)2 is a strong base
The ph will be the pH of a strong base
pOH = -log[0.0638)
pOH = 1.20
pH = 14 -1.20 = 12.80
2. How far can you push a sled if you exert a force of 7 N in the same direction and the amount of work you did was 56 J?
Answer:
8 m
Explanation:
by using well known formula
[tex]s=\frac{W}{F}=\frac{56}{7}=8[/tex]
To determine the distance a sled can be pushed with 7 N of force and 56 J of work done, you divide the work by the force, which yields a distance of 8 meters.
To find out how far you can push a sled by applying a force of 7 N, which resulted in 56 J of work, you use the work formula:
Work (W) = Force (F) x Distance (d)In the above, W = 56 J and F = 7 N. To find the distance (d), you rearrange the formula to solve for d:
d = W / FNow plug in the values:
d = 56 J / 7 N = 8 metersTherefore, you can push the sled 8 meters by exerting a force of 7 N if the amount of work done was 56 J.
What mass, in grams, of aluminum hydroxide will be required to prepare the 4 L of a 1.75 M solution?
Answer: 0.53g
Explanation:
No of moles= volume ×molarity/1000
We have the volume and the molarity
Volume=4L
Molarity=1.7M
No of moles = 4×1.7/1000
No of moles= 0.0068moles
Remember also that
No of moles= mass given/molar mass
Molar mass of Al(OH)3
Al= 27
O=16
H=1
Molar mass = Al+(O+H)3
Molar mass= 27+(16+1)3
Molar mass= 27+(17)3
Molar mass = 27+51
Molar mass= 78g/mol
To get the mass
Mass given = no of moles × molar mass
Mass= 0.0068×78
Mass= 0.53g
Can red cabbage juice indicator be used to determine the strength of acids and bases? Explain.
The strong acid and strong base has high rate constant of dissociation. Weak acid and base are the one whose rate constant for the dissociation is low, they do not dissociate readily in water. The red cabbage juice can be used to determine the strength of acids and bases.
What are acid and base?Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base are the solution which releases hydroxide ion OH⁻ ion when dissolved in water
Red cabbage juice contain a pigment called anthocyanin. Acidic solutions turns purple color of anthocyanin red. Basic solutions turns purple color of anthocyanin greenish-yellow. There will be no change in color in neutral solution.
Therefore, red cabbage juice can be used to determine the strength of acids and bases.
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The graph that BEST represents the speed of sound relative to the density of the medium it is traveling through is A) A B) B C) C D) D
Answer:
B .
Explanation:
Answer:
D
Explanation:
I tried it and it worked :)
6-8 , what does those symbols mean ?
Answer:
The weird one that looks like a B is a symbol for a beta ray.
"He" and the infinity looking a represents an alpha particle.
6= Beta ray
7 & 8= alpha particle
Which describes the way a convection current moves? A in a spiral B in a line C in a loop
Answer:
C a loop
Explanation:
Answer:
I think its C
Explanation:
Describe the electrolysis of molten lithium chloride to produce lithium and chlorine gas.
Answer:
it mainly depends what state of lithium chloride that you use to electrolysis, if you choose the aqueous state of lithium chloride then you'll have a produce of chlorine and oxygen at the anode, lithium and hydrogen is produce at the cathode but lithium will react with water to form lithium hydroxide
Explanation:
Final answer:
The electrolysis of molten lithium chloride results in the formation of lithium metal at the cathode and chlorine gas at the anode, involving the direct conversion of chemical energy into electrical energy through electrolysis.
Explanation:
The question is about describing the electrolysis of molten lithium chloride to produce lithium and chlorine gas. The process of electrolysis involves passing an electric current through molten lithium chloride (LiCl), resulting in the formation of lithium metal (Li) and chlorine gas (Cl₂). This process takes place in an electrolytic cell.
At the cathode (negative electrode), lithium ions (Li⁺) gain electrons (e⁻) to form lithium metal (Li).At the anode (positive electrode), chloride ions (Cl⁻) lose electrons to form chlorine gas (Cl₂).Overall reaction: 2LiCl(l) → 2Li(s) + Cl₂(g)
At the cathode: Li⁺ + e⁻ → Li(s)
At the anode: 2Cl⁻ → Cl₂(g) + 2e⁻
These reactions demonstrate the principle of electrochemistry where chemical energy is converted into electrical energy, and vice versa. The electrolysis of molten lithium chloride is an efficient way to produce pure lithium metal and chlorine gas, which have various applications in industries.
0.65 moles of O2 originally at 85°C is cooled
such that it now occupies 8.0 L at 40.°C.
What is the final pressure exerted by the gas?
Answer:
2.09 atm
Explanation:
We can solve this problem by using the equation of state for an ideal gas, which relates the pressure, the volume and the temperature of an ideal gas:
[tex]pV=nRT[/tex]
where
p is the pressure of the gas
V is its volume
n is the number of moles
R is the gas constant
T is the absolute temperature
In this problem we have:
n = 0.65 mol is the number of moles of the gas
V = 8.0 L is the final volume of the gas
[tex]T=40C+273=313 K[/tex] is the temperature of the gas
[tex]R=0.082 atm L mol^{-1} K^{-1}[/tex] is the gas constant
Solving for p, we find the final pressure of the gas:
[tex]p=\frac{nRT}{V}=\frac{(0.65)(0.082)(313)}{8.0}=2.09 atm[/tex]
0.65 moles of O₂ at 40. °C and 2.1 atm occupy a volume of 8.0 L.
0.65 moles (n) of O₂ originally at 85°C is cooled. It occupies 8.0 L (V) at 40.°C (T). We will convert the final temperature to Kelvin using the following expression.
[tex]K = \°C + 273.15 = 40\°C + 273.15 = 313 K[/tex]
We can calculate the final pressure (P) exerted by the gas using the ideal gas equation.
[tex]P \times V = n \times R \times T\\\\P = \frac{n \times R \times T}{V} = \frac{0.65 mol \times (\frac{0.082atm.L}{mol.K} ) \times 313K}{8.0L} = 2.1 atm[/tex]
0.65 moles of O₂ at 40. °C and 2.1 atm occupy a volume of 8.0 L.
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How do the processes of weathering, erosion, and deposition affect the ecoregions of Texas? Give a specific example of how each process affects a particular ecoregion.
Answer:
Answer is explained below in the explanation section.
Explanation:
In this whole planet, there are three main determinants which determine the shape, topography and soil features on the surface of Earth. Which are as follows:
1. Weathering
2. Erosion
3. Deposition
All three processes occur simultaneously irrespective of any dependence. In addition, due to weathering, erosion and deposition together affects the land and particular supportive ecosystem.
Likewise in Texas, due to these processes, it has form ten different landforms or eco-regions.
For instance, take weathering into account and its effect on ecoregions of Texas.
In summer, we have hot weather, it means precipitation of water or transition of wet to dry. Windy weather accompanied with erosion cut the mountains and rocks and builds a particular topography suitable for a particular ecosystem. Furthermore, if there are no plants or bushes and soil is exposed to water and wind then erosion is very easy to take place.
So, water, temperature, wind, rivers are extremely powerful agents for weathering , erosion and deposition.
Final answer:
Weathering, erosion, and deposition collectively influence Texas's ecoregions by shaping landscapes, such as creating caves in the Hill Country, forming desert pavement in West Texas, and enriching soils along the Gulf Coast.
Explanation:
The physical processes of weathering, erosion, and deposition play significant roles in shaping the ecoregions of Texas. Weathering breaks down rocks and minerals into smaller pieces through mechanical and chemical processes. For example, the limestone of the Texas Hill Country undergoes chemical weathering through the acidic rainwater, creating characteristic features such as caves and sinkholes.
Erosion is the process by which weathered material is moved from one location to another. In the arid regions of West Texas, eolian erosion by wind can lead to the formation of desert pavement, where fine particles are blown away, leaving a layer of larger rocks. This protects the soil underneath from further erosion.
Finally, deposition is when eroded materials are laid down in new locations. Along the Gulf Coast of Texas, river sediments are deposited, building up the coastal plains and contributing to the growth of deltas. Here, deposition leads to nutrient-rich soils that support diverse ecosystems and human agriculture.
At constant volume, the pressure of a gas is 755 kPa at 30.0 degrees C. What is the temperature of the gas if the pressure is decreased to 252 kPa?
Answer:
T₂ = 101.13 K OR
- 172.02 °C
Explanation:
Given data:
Initial pressure of gas = 755 Kpa
Initial temperature = 30.0°C
Final temperature = ?
Final pressure = 252 Kpa
Solution;
Initial temperature = 30.0°C (30+273 = 303 K)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
755 Kpa / 303 K = 252 Kpa / T₂
T₂ = 252 Kpa ×303 K / 755 Kpa
T₂ = 76356 KPa.K / 755 Kpa
T₂ = 101.13 K
Kelvin to °C:
101.13 K - 273.15 = - 172.02 °C