HELP 100 POINTS WILL MARK BRAINLIEST In ancient times, early astronomers watched stars travel across the sky in one direction for several months, then over the course of a few weeks the stars would reverse course and move in the opposite direction. After these few weeks, the stars would reverse direction again and resume their original course. The ancient astronomers called these “wanderer stars”. After more research was done, it was found that these “wanderer stars” were actually other planets. As more data was collected, it was shown that all planets move at different speeds as they travel in their orbits around the Sun. As the Earth moves in its orbit, it moves faster than some planets and slower than others. This causes the Earth to “pass” some planets as it travels, which results in the appearance that the other planets move backwards. Is this a description of a scientific law or scientific theory? 100 points PLEASE HELP

Answers

Answer 1
It’s the description of a scientific law

because Astronomers call this the “retrograde motion”. It’s just our viewpoint from earth. The plants aren’t actually changing directions. For example, Mars has the largest retrograde motion. Since Mars is further from the Sun than our planet, it orbits the Sun slower, meaning Earth on the inside track can catch it up and then overtake it.

Related Questions

There are________
neutrons in the stable isotope of rhenium (Re-
185)

A.134
B.90
C.125
D.110

Answers

A.134 sorry if it’s wrongggg

There are 110 neutrons in the stable isotope of rhenium. The correct option is D.

What are neutrons?

A neutron is a subatomic particle that exists in the nucleus of all atoms except simple hydrogen. The name of the particle comes from the fact that it has no electrical charge; it is neutral. Neutrons have a very high density.

With the exception of the single-proton hydrogen nucleus, nuclei require neutrons to be stable. Neutrons are abundantly produced during nuclear fission and fusion.

Through mainly the process of fission, fusion, as well as neutron capture processes, they are a major contributor to the nucleosynthesis of chemical elements within stars.

The element rhenium-185 is made up of 75 protons, 110 neutrons, and 75 electrons. The element rhenium-187 is made up of 75 protons, 112 neutrons, and 75 electrons.

Thus, the correct option is D.

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A state of dynamic equilibrium, Ag2CO3(s) 2Ag^+(aq) + CO3^2-, exists in solution.
What shift occurs in the equilibrium if HCl (aq) is added to the system? Explain please

Answers

Answer:

The equilibrium will shift to the right producing more Ag⁺ and CO₃²⁻

Explanation:

In the equilibrium:

Ag₂CO₃(s) ⇄ 2Ag⁺(aq) + CO₃²⁻(aq)

The change in concentration of Ag⁺ or CO₃²⁻ will shift the equilibrium

The addition of HCl(aq) (Dissociates in H⁺ and Cl⁻ ions) produce the formation of AgCl. The reaction is:

Ag⁺(aq) + Cl⁻(aq) ⇄ AgCl(s)

That means the addition of HCl decrease concentration of Ag⁺.

Based on LeChatelier's principle: As the Ag⁺ decreases, the equilibrium will decrease amount of Ag₂CO₃ producing more Ag⁺ and CO₃²⁻. That is:

The equilibrium will shift to the right producing more Ag⁺ and CO₃²⁻

Consider a closed container of gas that is a mixture of 30% CO2 and 70% N2 at room temperature 20°C. The gases are in thermal equilibrium with one another. a) Which has the higher kinetic energy, the average CO2 or N2 molecule? b) What is that root-mean-square velocity of a CO2 molecule? For reference, a carbon atom has 6 protons, a nitrogen atom has 7 protons, and an oxygen atom has 8 protons.

Answers

Answer:

a. the kinetic energy will be the same.

b. [tex]\mathbf{\overline v = 407.65 \ m/s}[/tex]

Explanation:

The kinetic theory deals with how the arrangement of particles of a substance determines the properties that substance will possess and the state in which it is likely to be found under a given set of conditions. From the postulates of the kinetic theory of gases, The average kinetic energy of the gas molecules is a measure of the temperature of the gas molecules, This implies that the kinetic energy is dependent on the temperature.

i.e

[tex]K.E = \dfrac{3}{2} \ KT[/tex]

where ;

K = Boltzmann Constant

Since the given gases are in thermal equilibrium, therefore, the kinetic energy will be the same.

b).

The root mean square velocity of CO2 molecule is represented by the equation :

[tex]\overline v = \sqrt{\dfrac{3RT}{M_m}}[/tex]

[tex]\overline v = \sqrt{\dfrac{3\times 8.314 \ J/K /mole \times (293.15 \ K ) }{44 \times 10^{-3} \ kg / mol}}[/tex]

[tex]\overline v = \sqrt{\dfrac{7311.7473 }{44 \times 10^{-3} }}[/tex]

[tex]\overline v = \sqrt{166176.075 \ m/s}[/tex]

[tex]\mathbf{\overline v = 407.65 \ m/s}[/tex]

Exactly how many -OH groups are found in a 6 carbon alditol?

Answers

Answer:

The number of  OH group found in found in a 6 carbon alditol is  6

Explanation:

The  structure of a 6 carbon alditol is shown on the first uploaded image

3-An analysis that determines the relative amounts of analytes in numerical terms
A) Quantitative Analysis
B) Qualitative Analysis
C)Quantitative Synthesis
D) Qualitative Synthesis
Q1-(30 Marks) Choose the correct answer​

Answers

Answer:

A.

Explanation:

Quantitative analysis.

Decaying plants and animals are important to an ecosystem because they
A.
cause disease in living organisms.
B.
reduce soil erosion.
C.
recycle oxygen to the air.
D.
return nutrients to the soil.

Answers

Answer:

The option D is correct answer.

Decaying pants and animals are important to the ecosystem as they return the nutrients to the soil.

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.

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Which statement describes a property that is unique to metalloids?

Metalloids are shiny.
Metalloids are semiconductive.
Metalloids are solid.
Metalloids are brittle.

Answers

Answer:

Metalloids are semiconductive.

Explanation:

Answer: Metalloids are semiconductive.

What is 2.1 x 10^6 + 6.2 x 10^7 in scientific notation

Answers

Answer:

2100000 + 62000000

Explanation:

You move the decimal place to the right or left acording to the exponent (right if the exponent in positive, left of the exponent in negative.) Ex: if you're solving for 6.2*10^7 you move the decimal 7 places to the right.

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-Kiddoo :)

E
1
1 point
Which of the following is an elemental substance?
Select all the correct answers.
Mercury
2
Oxygen (O2)
3
Platinum
Chlorine (C12)
Carbon Dioxide (CO2)

Answers

Answer:

oxygen and Carbon dioxide

What determines the shape and function of a protein?

Answers

The function is determined by shape. The protein is determined by its primary structure which is the sequence of amino acids.
Amino acid sequence is determined by nucleotides in the gene (DNA)

The shape and function of a protein are primarily determined by its three-dimensional structure, which is a result of its primary, secondary, tertiary, and quaternary structures.

Primary Structure: The primary structure of a protein is the linear sequence of amino acids that make up the polypeptide chain. The sequence is dictated by the genetic information encoded in the DNA of the gene that corresponds to the protein. Each amino acid in the sequence is represented by a specific codon in the DNA, and this sequence of amino acids forms the backbone of the protein.

Secondary Structure: The secondary structure refers to the local spatial arrangement of the polypeptide backbone, which is stabilized by hydrogen bonds between amino acids. The two most common secondary structures are alpha-helices and beta-sheets. These structures are important for the stability and folding of the protein.

Tertiary Structure: The tertiary structure is the three-dimensional folding of the entire polypeptide chain, including the secondary structure elements. Various interactions, such as hydrogen bonds, disulfide bridges, ionic interactions, hydrophobic interactions, and van der Waals forces, play a crucial role in stabilizing the tertiary structure. This folding brings distant parts of the polypeptide chain close together, contributing to the unique shape of the protein.

Quaternary Structure: Some proteins are composed of multiple polypeptide subunits, and the way these subunits come together forms the quaternary structure of the protein. The interactions between the individual subunits contribute to the overall structure and function of the complex protein assembly.

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Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table? aThe alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion. bThe alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion. cThe alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal. dThe alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.

Answers

The atom of alkaline earth metal has one more proton and one more electron than the alkali metal that is next to it to the left on the periodic table. Then the atomic number of the alkali metal is one unit less than the atomic number of the alkaline earth metal next to it

Answer:

A) The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.

Explanation:

Let's evaluate each answer.

A: The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.

This means that the alkali metal atom has to lose 1 valence electron to form a +1 ion while the alkaline earth metal atom has to lose 2 valence electrons to form a +2 ion. This is accurate because alkali metal atoms have 1 valence electron while alkaline earth metal atoms have 2, so the statement is correct.

B: The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.

This would mean that the alkali metal atom has to lose 2 valence electrons to form a +2 ion, while the alkaline earth metal has to lose 1 valence electron to form a +1 ion. This is incorrect because alkali metal atoms only have 1 valence electron and will become a +1 ion when losing that electron, while alkaline earth metals have 2 valence electrons and will form a +2 ion upon losing them.

C: The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.

This would mean that the alkali metal atom would be located one period higher up than the alkaline earth metal atom. This is untrue, because the question states that the alkali metal atom is located directly next to the alkaline earth metal atom, so they have the same amount of electron shells.

D: The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.

This would mean that the alkali metal atom would be located one period lower on the periodic table than the alkaline earth metal atom. Similar to the previous statement, this is untrue because the question states that they are located directly next to each other, or on the same period.

(Also, I just took this quiz and e2020 says it's right.)

How many moles of calcium are in 5.82g of calcium?

Answers

Answer:

0.024951344877489 mole.

Explanation:

y

How does accuracy and precision impact your life

Answers

Explanation:

Accuracy refers to the closeness of a measured value to a standard or known value. For example, if in lab you obtain a weight measurement of 3.2 kg for a given substance, but the actual or known weight is 10 kg, then your measurement is not accurate. In this case, your measurement is not close to the known value.

Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy. You can be very precise but inaccurate, as described above. You can also be accurate but imprecise.

For example, if on average, your measurements for a given substance are close to the known value, but the measurements are far from each other, then you have accuracy without precision.

A good analogy for understanding accuracy and precision is to imagine a basketball player shooting baskets. If the player shoots with accuracy, his aim will always take the ball close to or into the basket. If the player shoots with precision, his aim will always take the ball to the same location which may or may not be close to the basket. A good player will be both accurate and precise by shooting the ball the same way each time and each time

PLEASE HELP ME, I HAVE NO IDEA HOW TO DO THIS :(

Answers

Lol . same here. If u get any ideas please let me know

Answer:

See the picture you have to write like this

You bought a new car and estimated that your monthly payment would be $312. However, your actual payment amount is $325. How much error was in your estimate?

Answers

There was a $13 difference

Part Of flowers that contains pollen is


Please answer right

Answers

Answer:

its the stamen, it also supports the Anther.

Answer:

The Stamen

Explanation:

The stamen is a slender filament supporting the anther, it is what produces and holds pollen in flowers.

The temperature at which carbon dioxide sublimes is about 195 K. What is this
temperature in units of degrees Celsius?

Answers

This temperature in units of degree Celsius is..

-78° Celsius

-78° Celsius is the temperature in units of degrees Celsius.

What is temperature?

Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius.

195 Kelvin = 195 - 273.15 = -78.15 Celsius.

-78° Celsius is the temperature in units of degrees Celsius.

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find the R when p=6000,T=3 yrs 6 month ,I=1155​

Answers

Answer:770R=I×100/P×T

R= 1155×100/6000×3/12

R= 1155×2/3

R=770

1- Science that deals with the identification and quantification of the components of material systems
A)Analytical Science
B)Biochemistry
C)Organic Chemistry
D) Inorganic Chemistry
Q1-(30 Marks) Choose the correct answer​

Answers

Answer:

Analytical science

Explanation:

which alkene represents the correct starting material phg?

Answers

Explanation:

The pH is larger than 7.

The relationship between pH and pOH is

pH + pOH = 14

if something is base, it's pH is greater than 7.

it's pOH is between 0 and 7.

Is it possible to produce a blood type AB from blood type A and B

Answers

Answer:

Yes, it is possible to produce a blood type AB from blood type A and B.

Explanation:

If we were to do a hybrid cross and the mother's blood type was A, then her genotypes would be AA and AO. Additionally, if the father had type B blood, his genotypes would be BB and BO. From this, we can tell that the child's genotypes would have to be A, AB, B, O. Since AB is one of the choices, yes, it is possible to produce a blood type AB from blood type A and B.

The only times where you won't be able to produce a child with type AB is if both of the parents have type B blood and type O blood. Or if one parent has type B blood and the another has type O blood. Or if one parent has type AB and the other one has O blood. Or if both parents have type A blood.

In a compound the elements are _____ together, whereas in a mixture the substances are blended together.

Answers

Answer:

bonded

Explanation:

Compounds are two elements bonded together.

A mixture is multiple substances blended together.  The substances aren't bonded together and can easily be extracted  from each other.

The density of silver is 10.5 g/cm3. What is the mass (in kilograms) of a cube of silver that measures 0.94 m on each side?

Answers

Answer:

8721.132 Kg.

Explanation:

The following data were obtained from the question:

Density (D) of silver = 10.5 g/cm³

Length (L) of silver = 0.94 m

Mass (m) of silver =.?

Next, we shall determine the volume of silver. This can be obtained as follow:

Volume = Length × Length × Length

Volume = L × L × L

Volume = L³

Length (L) of silver = 0.94 m

Volume (V) of silver =?

Volume (V) of silver = 0.94³

Volume (V) of silver = 0.830584 m³

Next, we shall convert 0.830584 m³ to cm³. This can be obtained as follow:

1 m³ = 1×10⁶ cm³

Therefore,

0.830584 m³ = 0.830584 m³ / 1 m³ × 1×10⁶ cm³

0.830584 m³ = 830584 cm³

Therefore, 0.830584 m³ is equivalent 830584 cm³.

Thus, the volume of the silver is 830584 cm³.

Next, we shall determine the mass of the silver. This can be obtained as follow:

Density (D) of silver = 10.5 g/cm³

Volume of the silver = 830584 cm³.

Mass of silver =.?

Density = mass /

10.5 = mass of silver /830584

Cross multiply

Mass of silver = 10.5 × 830584

Mass of silver = 8721132 g

Finally, we shall convert the mass of silver, 8721132 g to kilogram (kg). This can be obtained as follow:

1000 g = 1 Kg

Therefore,

8721132 g = 8721132 g / 1000 g × 1 Kg

8721132 g = 8721.132 Kg

Therefore, the mass of each cube of silver is 8721.132 Kg

Over the course of many years, a rural farm town becomes more urban. Which of the following will most likely happen in the town as a result of this urbanization?

Answers

Answer:

Explanation:

Rivers may be contaminated by sewage.

I do hope I helped you! :)

Which of the following is a buffer system?
A. NaCl and NaNO3
B. H2CO3 and KHCO3
C. HCl and NaOH
D. H2O and HCl
E. NaCl and NaOH

Answers

Answer:

B. H2CO3 and KHCO3

Explanation:

The buffer system is a system in which the solution deny for change in the ph level i.e. at the time when the acid is added to it. It can be made either in a weak acid and salt or can be a weak base and its salt. Now when the acid is added to a buffer so the ratio is not impacted due to which it does not change sufficient for pH level

As per the given options, the third one is correct as the H2CO3 denotes a weak acid and the KHCO3 represents the salt. And these two solution does not create any change in the level of pH

Therefore the option B is correct

6. Un volumen de 1.0 mL de agua de mar contiene casi 4 x 10-12 g de Au. El volumen total de agua en los océanos es de 1.5 x 1021 L. Calcule la cantidad total de Au (en gramos) existente en los océanos y su valor total en dólares. ( 1 onza = $ 948)

Answers

Answer:

The total amount of Au is $ [tex]2.0\times10^{24}[/tex]

Explanation:

Given that,

Mass of 1.0 ml of Au [tex]m=4\times10^{-2}\ g[/tex]

Total volume of water in oceans [tex]V=1.5\times10^{21}\ L[/tex]

We need to calculate the volume in ml

Using given volume

[tex]V=1.5\times10^{21}\times1000\ mL[/tex]

[tex]V=1.5\times10^{24}\ mL[/tex]

We need to calculate the total mass of Au  

Using given data

[tex]1\ ml\ volume = 4\times10^{-2}\ g[/tex]

[tex]1.5\times10^{24}\ ml=4\times10^{-2}\times1.5\times10^{24}[/tex]

So, The total mass of Au is [tex]6\times10^{22}\ g[/tex]

The mass will be in ounce,

[tex]Mass=0.035274\times6\times10^{22}[/tex]

[tex]Mass=2.12\times10^{21}\ ounce[/tex]

The total amount of the Au Will be

[tex]Total\ amount=2.12\times10^{21}\times948[/tex]

[tex]Total\ amount=2.0\times10^{24}[/tex]

Hence, The total amount of Au is $ [tex]2.0\times10^{24}[/tex]

A cannonball made of iron has a volume of 110. cm3. What is the mass, in kilograms, of the cannonball?

Answers

Answer:

1 cubic centimeter (cu cm) = 0.001 kilogram (kg)

110cm³ =110*0.001=0.11kg

Explanation:

The volume has been the space occupied by the object and substances and uses the derived units. The mass of the iron ball with a volume of 110 cubic centimeters is 0.11kg.

What is volume?

Volume has been the three-dimensional space that an object has been using in space. The volume can be measured differently for the various states of matter in various units. Volume is the physical parameter to measure the states of matter.

The estimation of the volume can be given by density or mass and has been expressed by the various units like liters, milliliters, cubic meters, cubic centimeters, kiloliters, cubic decimeters, gallons, etc.

The unit cubic centimeter can be converted into kilogram (kg) as:

1 cubic centimeter = 0.001 kilogram

Given,

The volume of a cannonball made of iron = 110 cubic centimeters

The unit conversion from cubic centimeter to kg is shown as:

1 cubic centimeter = 0.001 kg

110 cubic centimeters = 0.11 Kg

Therefore, 0.11 kilogram is the mass of a cannonball made of iron.

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What particle(s) of an atom would NOT found in the nucleus?
Electrons
proton
neutron
neutrons and electrons

Answers

Answer:

Electrons, they circle the nucleus.

What is an example of a physical change?

A. having less ash than the paper that was burned to form it
B. ice forming and then melting back into water
C. rust having a different identity than the iron it forms on
D. the irreversible reaction of vinegar and baking soda

What one would you guys choose?

Answers

Answer:

B is correct answer

Explanation:

Answer:

B.

Explanation:

Which of the following is a description of an exothermic reaction?

A. releases heat
B. reactants have less enthalpy than the products
C. ∆H is positive
D. gets cold

Answers

A description of an exothermic reaction is it releases heat. The correct option is A.

What is an exothermic reaction?

An exothermic reaction is a reaction in which heat is released into the atmosphere. In these reactions, less energy is needed to start the reaction and the energy is released when bonds are made in the products. Delta H is always negative in these reactions.

Energy is always given off when the reaction happened, in the form of heat and light. Examples are burning of wood, melting of ice, combustion, corrosion, etc.

Thus, the correct option is A. releases heat regarding a description of an exothermic reaction.

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Which expressions have a sum of 12? 6.6 as a mixed number which of the following means "a strong desire to have or get money; greed"?a . bracingb. avaricec. Maudlind.grit When 8 is added to four times a number the result is 80 find the number If a line has a slope 2/3 a line that is perpendicular has a slope of what which colony correctly completes the diagramA MarylandB VirginiaC South CarolinaD Georgia Lisa's age is 4 years older than three times Sammy's age. Lisa is 28 years old. Let s represent Sammy's age. Which equation can be used to solve for Sammy's age? 6x + 2y = 12How do I show my work ? how many grams in 5mg The species on the Galapagos had no contact with what for millions of years? 1-2 +4.32 - 6a.-16b-142. 5 + 422(3)C283. -5- (32 +2)d. 294 22 3.6 In a _____ organizational structure, project managers work full-time on projects, while team members report to both functional managers and project managers On what type of map would you see mountains, hills, plains and oceans? If someone can help me figure out #6. Thanks A beverage company operates two factories. Their outputs are represented by these expressions, where b is the number of bottles produceFactory A: 2b3 3b2 + b - 120Factory B: 4b2 3b 260Which polynomial represents the company's total output?A. 6b3 3b2 - 3b - 140B. 2b3 - 7b2 + 4b + 140C 2b3 + b2 - 2b - 380D. 6b3 6b2 + b + 380 Help me please I will mark as brainliest. 2(-5y + 6) + (2y - 8) Describe how an atlatl was useful to early people in the southwest. Plz help Will mark brainliest Storm Concert Promotions Valle Home Builders Actual indirect materials costs$12,400 $7,000 Actual indirect labor costs 55,900 46,900 Other overhead costs 16,000 48,900 Overhead applied 91,600 98,300 Storm Concert Promotions Determine whether overhead is overapplied or underapplied. Prepare the journal entry to allocate (close) overapplied or underapplied overhead to Cost of Goods Sold. Valle Home Builders Determine whether overhead is overapplied or underapplied. Prepare the journal entry to allocate (close) overapplied or underapplied overhead to Cost of Goods Sold.