evidence that the Big Bang Theory actually occurred
Answers
Answer:
Two major scientific discoveries provide strong support for the Big Bang theory: • Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.
Explanation:
Related Questions
1. Calculate the energy for each of the following (1 pt each): Show all your work(a) Joules needed to heat 83.5 g of water from 26.7 °C to 75 °C.
Answers
The question requires us to calculate the energy, in joules (J), necessary to heat 83.5g of water from 26.7 °C to 75°C.
The heat energy (Q) can be calculated from the mass of the sample (m), its specific heat capacity of the substance (C) and temperature variation (ΔT), as given by the following equation:
\(Q=m\times C\times\Delta T\)Since the question did not provide a value for the specific heat capacity of water, we'll adopt the value 4.182 J/g.°C. Applying the values provided by the question, we can calculate the heat energy as:
\(\begin{gathered} Q=m\times C\times\Delta T \\ Q=(83.5g)\times(4.182J/g\mathrm{}\degree C)\times(75-26.7)\degree C=(83.5g)\times(4.182J/g\degree C)\times(48.3\degree C) \\ Q=1.69\times10^4J \end{gathered}\)Therefore, the heat energy necessary to heat the amount of water given grom 26.7 to 75°C is 1.69 x 10^4 J (or 16900 J).
Why do different material have different affinity of electrons?
Answers
Because of their differing nuclear charges, and as a result of shielding by inner electron shells, the different atoms of the periodic table have different affinities for nearby electrons.
The electron affinity is the potential energy change of the atom when an electron is added to a neutral gaseous atom to form a negative ion. So the more negative the electron affinity the more favourable the electron addition process is.
Not all elements form stable negative ions in which case the electron affinity is zero or even positive.
Electron affinity depends on the nuclear charge of an atom.
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Which phrase describes a homogeneous catalyst?
Answers
Answer:
It is in the same phase as the reactants.
Explanation:
i took the test
This reaction releases energy as heat. Explain whether the reaction is exothermic or endothermic and whether it obeys the law of conservation of energy
Answers
Answer:
Exothermic, it obeys the law of conservation of energy
Explanation:
The reaction is an exothermic change. In this kind of change, heat is liberated to the surrounding. So the surrounding becomes hotter at the end of the heat change.
In chemical reactions that involves the loss of energy as heat, they obey the law of conservation of energy.
The law of conservation of energy states that energy is neither created nor destroyed but transformed from one form to another. In such reactions as this, chemical energy is transformed into heat energy.
What volume will 106.476 g N, gas at STP occupy?
O 85.1808L
O 170.362L
O 7.60543L
0 3.80271L
Answers
Answer:
170.362 L
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesGas Laws
STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify variables
[Given] 106.476 g N
[Solve] L N
Step 2: Identify Conversions
[STP] 1 mol = 22.4 L
[PT] Molar Mass of N: 14.01 g/mol
Step 3: Convert
[DA] Set up: \(\displaystyle 106.476 \ g \ N(\frac{1 \ mol \ N}{14.01 \ g \ N})(\frac{22.4 \ L \ N}{1 \ mol \ N})\)[DA] Divide/Multiply [Cancel out units]: \(\displaystyle 170.24 \ L \ N\)how can we predict if a single replacement reaction will occur
Answers
A single replacement reaction is a type of chemical reaction that takes place when one element in a compound is replaced by another element. In other words, in this reaction, one element is replaced by another element. There are a few ways to predict whether or not a single replacement reaction will occur.
These ways are explained below: Paying Attention to ReactantsThe first way to predict if a single replacement reaction will occur is by paying attention to the reactants. In a single replacement reaction, a more reactive element will replace a less reactive element. For example, if a metal element is mixed with an aqueous solution that contains ions of another metal, a single replacement reaction will occur if the metal in the solid state is more reactive than the metal in the solution state. For instance, if you put zinc in copper sulfate, a reaction will occur because zinc is more reactive than copper. Therefore, it will replace copper, producing zinc sulfate and copper.Using the Activity SeriesAnother way to predict if a single replacement reaction will occur is by using the activity series. The activity series is a list of metals and their ability to replace other metals from their compounds. This list is arranged in order of decreasing activity. Therefore, if a metal is more active than another metal on the activity series, it will replace that metal from its compound. For example, if you put magnesium in silver nitrate, a reaction will occur because magnesium is more reactive than silver. Therefore, magnesium will replace the silver, producing magnesium nitrate and silver. If the metal is less active than another metal on the activity series, no reaction will occur.Using Electrochemical SeriesThe electrochemical series is another way to predict if a single replacement reaction will occur. The electrochemical series lists the elements in order of their standard reduction potentials. A metal with a higher reduction potential will replace a metal with a lower reduction potential from its compound. For instance, if you put copper in magnesium sulfate, no reaction will occur because copper has a lower reduction potential than magnesium. Therefore, magnesium will not replace copper from its compound.
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For 55.0seconds, Trevor was hang gliding at a constant velocity. In that time, he moved 583meters to the southeast, and a flock of Canada geese flew past him at 17 meters per second. What was Trevor's velocity?
Answers
The velocity of the Trevor is equal to 10.6 m/s.
What is velocity?Velocity is a vector quantity and can be defined as the change in position of the object (∆x) divided by the time intervals (∆t) in which it takes place. The velocity can be positive or negative and the S.I. unit is m/s.
The velocity of the object = ∆x/∆t
Given, the distance covered by Trevor = 583 m
The time is taken by Trever to cover this distance, t = 55 s
The Trevor's velocity = 583/55 = 10.6 m/s
Therefore, the velocity of the Trevor is 10.6 m/s, and therefore the flock moves at 17 m/s past him.
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If a dog grows more fur in the cold winter season, what do we call this?
Answers
The seasons effect the rate of increase of a canine's coat. The longer sunlight hours stimulate fur increase withinside the lighter summer time season months, so hair grows quicker than withinside the colder, darker months.
These durations of introduced losing generally begin all through the spring and fall whilst the climate shifts. As such, puppies may also shed greater withinside the wintry weather due to the fact they are dropping their summer time season coat and developing of their more fluffy wintry weather layer. During the fall, your canine is getting equipped for wintry weather. This method that they may take away their skinny summer time season coat and regrow a wealthy and thick undercoat to shield them from low temperatures. So the distinction among canine wintry weather and summer time season coats is that wintry weather coats are thick whilst summer time season coats are skinny.
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why is it called the Solar system?
Answers
Answer:
Because it's a system in the solar areas.
Explanation:
Im just tryna sound smart, I actually have no clue
Answer:
The Latin word for the Sun is Sol, so we call this system the Solar System. He showed that it was very likely that all the planets moved around the Sun. This time even more people thought Galileo may be right and that the Earth really did move around the Sun.
Explanation:
There are many planetary systems like ours in the universe, with planets orbiting a host star. Our planetary system is named the "solar" system because our Sun is named Sol, after the Latin word for Sun, "solis," and anything related to the Sun we call solar.
Hope That Helps :0
Vectors A, B, and C, have the following components: Ax=1.0,Ay=2.0Bx=3.5,By=−4.0Cx=−5.0.Cy=6.0 Find the combination of these components where: AV/2−2By+5CV= ? 3.5 23 18.5 39 4.0
Answers
The combination of the given components yields -16.5.
To find the combination AV/2 - 2By + 5CV,
We need to substitute the given components of vectors A, B, and C into the expression.
Given:
Ax = 1.0
Ay = 2.0
Bx = 3.5
By = -4.0
Cx = -5.0
Cy = 6.
Substituting these values into the expression:
AV/2 - 2By + 5CV = (Ax/2) - 2(By) + 5(Cx)= (1.0/2) - 2(-4.0) + 5(-5.0)
= 0.5 + 8.0 - 25.0
= -16.5
Therefore, the combination of the given components yields -16.5.
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calculate the mass of 3.5 moles of copper sulphate
Answers
Answer: 558.5545 g
Explanation:
The formula for a sulphate ion is \(\text{SO}_{4}^{\text{ }2-}\), so the formula for copper sulphate is \(\text{CuSO}_{4}\).
The atomic mass of copper is 63.546 g/mol.The atomic mass of sulfur is 32.065 g/mol.The atomic mass of oxygen is 15.994 g/mol.This means the formula mass of copper sulphate is:
63.546+32.065+4(15.994)=159.587 g/mol.So, in 3.5 moles, the mass is (159.587)(3.5)=558.5545 g
Which property of water contributes most to the ability of fish in lakes to survive very cold winters?.
Answers
Answer:
And that means fish must be able to survive down here. This is due to a special property of water: the elasticity of H2O. We know that when the temperature sinks below freezing, water first contracts and then expands as it begins to turn to ice. Ice, being lighter than water, floats.
Explanation:
The property of water that allows fish to survive in a lake that is frozen over is the fact that ice is less dense than liquid water.
write a paragraph to explain how the transformation of water from one state of matter to another is important for the water cycle
Answers
In order for us to have water to drink, it first needs to go through a process called the water cycle. And in that water cycle there’s a process called evaporation. Evaporation is the process by which water changes from a liquid to a gas. In order for it to rain we need clouds and clouds are made of water. The water is heated causing water molecules to convert into gas, that gas then goes through a process called condensation creating clouds. At some point those clouds will be full of water, and all that water will then cause the cloud to release the water molecules causing rain.
The water cycle shows the continuous movement of water within the Earth and atmosphere. It is a complex system that includes many different processes.
Liquid water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow.There are four main parts to the water cycle:
Evaporation, Convection, Precipitation and Collection.
Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam.
The water vapor or steam leaves the river, lake or ocean and goes into the air.
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Which of the following best describes an ethogram?
1) a graphical way to display the behaviour of an animal
2) a description of the behaviour performed by an animal at one point in time
3) an inventory of the behaviour of a particular species
4) the behaviour observed in response to an experimental intervention
Answers
Option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.
An ethogram can be best described as an inventory of the behavior of a particular species. It is a systematic catalog or list of behaviors exhibited by a specific animal species.
An ethogram provides a comprehensive overview of the behaviors displayed by the animals under study, documenting various activities, actions, and patterns of behavior.
While options 1 and 2 are related to visual representations or descriptions of behavior, they do not capture the comprehensive nature of an ethogram. Option 4 refers specifically to behaviors observed in response to an experimental intervention, which is more narrow in scope compared to an ethogram. Therefore, option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.
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which compound will form the most intensely colored 0.01 m aqueous solution?
Answers
The compound that will form the most intensely colored 0.01 M aqueous solution will depend on the specific compound and its ability to exhibit color in solution.
The compound that will form the most intensely colored 0.01 M aqueous solution will depend on the specific compound and its ability to exhibit color in solution. Without knowing the specific compounds being considered, it is difficult to provide a definitive answer. Different compounds can exhibit a wide range of colors based on their molecular structure and electronic transitions.
In general, compounds with highly conjugated systems or transition metal complexes tend to exhibit intense colors in solution. These compounds often have extended delocalized π-electron systems that allow for absorption of light in the visible range, resulting in the observed color.
To determine which compound would form the most intensely colored solution, it would be necessary to consider the specific compounds and their molecular structures, including the presence of conjugated systems or transition metal ions. Conducting experiments or consulting references specific to the compounds in question would provide more accurate information regarding their coloration in aqueous solution.
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An ion has 26 protons, 28 neutrons, and 24 electrons. Which element is this ion? a. Xe b. Ni c. Fe d. Mg e. Cr
Answers
The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).
An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.
This means that the number of protons in an atom is unique to a specific element.
Iron (Fe) has 26 protons in the nucleus of its atom.
Therefore, an ion with 26 protons is an ion of the element iron (Fe).
Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.
Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons is Fe (option c)
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mammoth cave np contains deposits of potassium nitrate (kno3) that were used in the past to produce saltpeter, an important ingredient in gunpowder. these nitrate deposits were exploited extensively (and virtually exhausted) to support military action during:
Answers
Mammoth Cave NP contains deposits of potassium nitrate (KNO3) that were used in the past to produce saltpeter, an important ingredient in gunpowder. These nitrate deposits were exploited extensively (and virtually exhausted) to support military action during the War of 1812.
Mammoth Cave NP contains deposits of potassium nitrate (KNO3) that were used in the past to produce saltpeter, an important ingredient in gunpowder. These nitrate deposits were exploited extensively (and virtually exhausted) to support military action during the War of 1812.The park is 211.26 square kilometers in size and has approximately 400 miles of surveyed caves. The longest cave system in the world is located here.
Mammoth Cave was established in 1941 as a national park. Since then, scientists have discovered that Mammoth Cave National Park's cave system is among the most biologically diverse in the world. Mammoth Cave National Park has been designated a UNESCO World Heritage Site and a Biosphere Reserve as well. So therefore these nitrate deposits were exploited extensively (and virtually exhausted) to support military action is during the War of 1812.
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which Scientific discovery resulted in the solid atom theory
being adapted into the Plum Pudding model of the atom?
Answers
Answer:
After discovering the electron in 1897, J J Thomson proposed that the atom looked like a plum pudding . To explain the two types of static electricity, he suggested that the atom consisted of positive 'dough' with a lot of negative electrons stuck in it.
Sam believes the rock is more denser than the pencil. He measured the mass of the rock to be 8.5 grams and volume to be 4.5mL. He measured the mass of the pencil to be 2.4 grams and volume to be 4.5mL. Density is the mass per unit volume of an object. When he put the rock and pencil into the water, the pencil floated and the rock sank. Which is more denser? Give your reasoning using actual density values.
Answers
Answer:
Rock
Explanation:
Let's calculate the density of each object:
Rock:
\(Density = \frac{mass}{volume}=\frac{8.5\ g}{4.5\ mL}=1.9\ g/mL\)
Pencil:
\(Density = \frac{mass}{volume}=\frac{2.4\ g}{4.5\ mL}=0.53\ g/mL\)
Therefore the rock is denser.
How is a rainbow made
Answers
Please help! Thank you!
Answers
The images that shows the formation of the ionic compound SrF2 is option B
How is SrF2 formed?Ionic compounds are chemical compounds made up of ions held together by electrostatic forces. These compounds typically consist of a metal cation and a non-metal anion.
The metal cation loses one or more electrons to become positively charged, while the non-metal anion gains one or more electrons to become negatively charged. The attraction between the oppositely charged ions creates a strong bond, known as an ionic bond.
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calculate the oxidation state of the underlined elements of K2 Cr2 O7
-----
Answers
Answer:
+4
Explanation:
In PbO2, oxygen exhibits an oxidation number of -2 (since it's not a peroxide or superoxide):
Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.
⇒ x + (−2) + (−2) = 0
x = +4
So the oxidation no. of Pb is +4.
I hope this helps.
What is li stand for in chemistry
Answers
A jug contains 2L of milk. Calculate the volume of the milk in m3
Answers
Answer: 0.002 m³
Explanation:
We can use our unit conversions to find the volume in m³.
\(2L*\frac{1m^3}{1000L} =0.002m^3\)
What is the mass of 3.00 moles of carbon
Answers
Answer:
36 grams as 1 mole is 12 grams
Answer:
tbh idk cause I will love to answer your question but ehh
Is BaOH2 soluble or insoluble in water?
Answers
Answer:
Explanation:
Tough question.
The answer is very dependent on the temperature of the water. At 0o C, less than 5 grams is soluble in water.
The curve increases as the temperature increases. At 80oC about 35 grams is soluble in water 100 mL of water. So Ba(OH)2 is very soluble at higher temperatures.
Maybe the question can be resolved just a little better at room temperature. The solubility is still less than 5 grams / 100 mL. That makes it slightly soluble or more soluble than other things.
So to answer the question, you need to specify the temperature. I would say it is, but be prepared to defend your answer.
Which of the following is an example of a chemical change?
A- The shell of an egg breaks when it is struck against a hard surface.
B- Chocolate squares are melted to make cake icing.
C- Flour and sugar are sifted together into a measuring cup.
D- A mixture of flour, sugar, eggs, and butter is baked to become a cake.
Answers
Answer:
D
Explanation:
It is D because once youve put together the ingredients and baked it you can not go in and taake out every ingredient and put it back to how it was before (Please also try to help me with my question it it about scaled copies, Please and thank you!)
Answer:
I believe the answer is B. Chocolate squares are melted to make cake icing.
Explanation:
Please answer the following question using the data below: H2O vapor content: 13 grams H2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10 ∘
C 52 grams at 30 ∘
C What is the dew point for the conditions listed above? LCL 3π5 25C Relative Humidity =100%
Answers
Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$
Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$
The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.
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??? Ipc helppp pllzz
Answers
-formation of a precipitate
-bubble formation
-color change
-temperature change
-odor formation
The only one that isn’t correct is change in state of matter. A change in a state of matter does not mean it’s a chemical change. For example, water boiling so it turns into gas is not a chemical change, and is a physical one. Also, water can freeze and turn into ice, which is also still a physical change. If something changes state of matter, it does not necessarily mean it’s a chemical change.
Draw the Lewis structure of Asoshowing 2 one pairs Identify the molecular geometry of AsO trigonal planar Rings More Draw Erase see-saw square planar 0 O trigonal bipyramidal linear 0 tetrahedral As square pyramidal octahedral O bent OT-shaped O trigonal pyramidal 0: : 0 What are the approximate bond angles in AsO? What is the hybridization of the central As atom? 120 O 109.5。 90° O 180° O sp2 An AsO ion is 0 nonpolar Opolar.
Answers
The Lewis structure of AsO showing 2 lone pairs is as follows:
O
As
/
X X (where X represents a lone pair)
The molecular geometry of AsO is trigonal planar. The central As atom is hybridized with sp2 hybridization. The approximate bond angles in AsO are 120 degrees. The AsO ion is polar.
A Lewis structure, also known as a Lewis dot diagram, is a way to represent the chemical bonding in a molecule. It uses dots (also called electron dots or Lewis dots) to show the valence electrons on an atom, and lines to show the bonds between atoms. The goal of drawing a Lewis structure is to use the valence electrons of the atoms in a molecule to form the most stable arrangement of atoms, that is to say, to achieve the octet rule where each atom has 8 valence electrons in its outermost shell.
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