Chemistry Middle School

Make the selection that best completes the sentence.
All of the planets in our solar system orbit the sun
A. in perfect circles
B. at the same speed
C. in an ellipse
D. at the same distance

Answers

Answer 1
The answer would be C. in an ellipse

Hope this answer helps!
Answer 2
the answer is C, in an ellipse.

Related Questions

What determines the atomic number of an element?

A. protons

B. neutrons

C. electrons

Answers

The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of thatelement. For example, all hydrogen atoms, and only hydrogen atoms, contain one proton and have anatomic number of 1.
Protons are your answer!
Hope this helps!

What happens if someone let's go of the button on an electric door bell

Answers

they would get shocked

Releasing the button on a doorbell opens the electrical circuit, stopping the flow of current and the bell's sound. This action is similar to how a circuit breaker works, by cutting off the electric current to prevent a continuous ring or possible overloading.

When someone releases the button on an electric doorbell, the electrical circuit that was completed when the button was pressed becomes open. This happens because doorbells are typically operated by a push button switch, which controls the flow of electricity. As long as the button is pressed, the circuit is closed, allowing electrical current to flow through and activate the bell or buzzer. Once the button is let go, the circuit opens, the current stops flowing, and the doorbell sound ceases.

Additionally, this action is akin to a circuit breaker in the way it interrupts the electrical flow. The breaker's electromagnet becomes less strong without the current, which in turn releases the moving contact, breaking the circuit. Though an electric shock from a doorbell is highly unlikely due to the low voltage involved, it's important to remember safety protocols when handling electrical circuits to prevent shock, reminiscent of the "can't let go" effect described with more dangerous voltages.

what is the realtionship between the kentic energy of molecules in an object and the objects tempeture

Answers

Temperature is a measure of the average kinetic energy of the particles in an object .Temperatures also measure how kinetic energy is not how hot or cold it is. It’s measuring what the amount of Kinetic Energy there when you throw something in the air and it comes back down

Heat will flow from a hot object to a cold object until the objects reach A. stability. B. boiling point. C. collapse. D. equilibrium.

Answers

The thermal energy will flow from the hotter object to the cooler object until their temperatures are equal i.e. until they reach equilibrium.

Answer:
D. equilibrium

Atoms sometimes form bonds to



A. Lose energy
B. Become more stable
C. Give away neutrons
D. Give away protons

Answers

d, give away protons

make me brainliest

Atoms sometimes form bonds to become more stable. Option B is correct.

The stability of atoms is determined by the arrangement and distribution of electrons in their energy levels or electron shells. Atoms tend to have the most stable configuration when their outermost electron shell is filled with electrons, either by gaining, losing, or sharing electrons with other atoms.

In the process of bond formation, atoms interact with each other and undergo a redistribution of electrons. This redistribution allows atoms to achieve a more favorable electron configuration, often resembling that of a noble gas with a full outer electron shell.

By forming chemical bonds, atoms can fill or empty their outermost electron shells, which increases the stability of the entire system. The resulting stability is driven by the decrease in potential energy associated with achieving a more favorable electron configuration.

Hence, B. is the correct option.

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Which represents the self ionization of water at 25 degrees

Answers

This question comes with four answer choices:

A. H2O + H2O ⇄ 2H2 + O2

B. H2O + H2O⇄  H2O2 + H2

C. H2O + H2O ⇄ 4H+ + 2O2-

D. H2O + H2O ⇄  H3O+ + OH-

Answer: option D. H2O + H2O ⇄  H3O+ + OH-

(the +sign next to H3O is a superscript, as well as the - sing next to OH)

Explanation:

The self-ionization of water, or autodissociation, produces the two ions H3O(+) and OH(-). The presence of ions is what explain the electrical conductivity of pure water.

In this, one molecule of H2O loses a proton (H+) (deprotonates) to become a hydroxide ion, OH−. Then, he hydrogen ion, H+, immediately protonates another water molecule to form hydronium, H3O+.

The wax of a burning candle is a fuel that combines with oxygen in the air. As the fuel is consumed, what happens to most of the energy stored in the bonds of the wax? A. It is used to produce work. B. It stays in the wax. C. It is released as potential energy. D. It is released as heat and light.

Answers

D. It is released as heat and light.

Answer:D. It is released as heat and light.

Explanation:

Energy cannot be created nor destroyed but can be converted from one form to another. This is the law of the conservation of energy. Energy is stored in the wax. When the wax is burnt, that energy is converted to another form of energy. In this case heat and light. Energy exists in various forms in nature. Energy is always converted from one form to another.

What is the frequency of a wave?

A the distance traveled by the wave during one full cycle

B. The distance from the beginning to the end of a cycle

C. The amount of cycles that occur in a given time

D. the amount of time that one full cycle takes

Answers

I believe the answer is B. The definition of frequency of a wave talks about the number of times a wave occurs within that second.

The frequency of a wave is the distance from the beginning to the end of a cycle. Therefore, option B is correct.

What do you mean by the term frequency ?

Frequency is measured in hertz and is defined as the quantity of oscillations of a wave per unit of time (Hz).

The equation f = vλ , where is the wavelength in metres and v is the wave speed in m/s, may be used to determine the frequency of a wave if the wavelength and speed of the wave are known.

The quantity of waves that pass a set location in a predetermined period of time is known as frequency. Hence, if a wave passes through in half a second, the frequency is 2 per second. The frequency is 100 times per hour if it takes 1/100 of an hour.

Thus, option B is correct.

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there are two parts of photosynthesis- the light reactions and the dark reactions. what is the end product of the dark reactions

Answers

the answers is ATP it  took me a long time to find it but here you go. hope i helped

The population of wild turkeys in an area tripled over the course of three years. Which of the following could be a contributing factor?an increase in the population of domestic turkeys an increase in predators decrease in resources decrease in predators

Answers

Decrease in predators because then the wild turkeys won't be killed.

Will give brainlest. Quinn was attempting to model the rock cycle with taffy pieces. She cut the taffy into small pieces with scissors. What portion of the rock cycle is she modeling to start her activity?
A.Erosion, where rock pieces are broken into tiny sediments

B.Weathering, where rock pieces are broken into tiny sediments.

C.Cementation, where sediments and rock pieces are smashed and cemented together.

D.Cutting the taffy into small pieces is not modeling a portion of the rock cycle.

Answers

Hi!

The portion of the rock cycle that Quinn was modeling by cut the taffy into small pieces with scissors was the Weathering, where rock pieces are broken into tiny sediments.

Weathering is a part of the Rock Cycle that doesn't involve movement and consists in the breaking down of minerals and rocks when they enter into contact with the atmosphere, hydrosphere or biosphere. Weathering can be Physical, Chemical or Biological, according to the mechanism of the rupture of the rock.

The complete Rock Cycle describes how Rocks can be transformed into Sedimentary, Igneous or Metamorphic Rocks. 

Have a nice day!

what is the total amount of heat, in joules, required to completely vaporize a 50.0-gram sample of liquid water at its boiling point at standard pressure

Answers

To get the total amount of heat or the energy required we will get it from this formula:
Q= M L 
when M= the mass of the substance =50 g
and L= the specific latent heat of vaporization 
and when the latent heat of vaporization is defined as the energy required to change the state of the substance from the liquid to gas phase, and here for water, we can assume it as 2258 j/g.
So by substitution:
Q = 50 * 2258 = 112900 J 





Study the diagram of a cell.





Which structures are found in both plant and animal cells?


W and X

W and Z

X and Y

Y and Z



Answers

The answer would be W and Z

Answer:

W and Z

Explanation:

W is cell membrane and Z is mitochondria. Both plant and animal cells have cell membrane, which is semi-permeable and slows the exchange of certain molecules in and out of the cell. Mitochondria is present in both animal and plant cells. Mitochondria is known as the powerhouse of cell. ATP through oxidative phosphorylation is generated in the mitochondria.

Identify two kinds of data the student will likely collect during his experiment. Identify the type of data collected and how the student might present his data.

Answers

qualitative (physical e. g. colour) and quantitative (numerical e. g. 3 grams) data

Although your question is incomplete a general answer on the two kinds of data a student will collect during an experiment are : Qualitative and Quantitative data

Qualitative data are data that describes the physical attributes of the results of an experiment. It can be obtained by observation.  

Example : the color of the solute or solvent used during the experiment  while

Quantitative data are data obtained in the numerical form during an experiment, it can be obtained by taking physical measurements and they are collected for statistical analysis.

Example : The molecular Weight of the solution, solvent or solute used for an experiment.

Hence the two main types of data collected during an experiment are : Quantitative and Qualitative data.

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Ibis was created by the bureau of alcohol ,tobacco, firearms and explosives in the United States true or false?

Answers

Answer: It is true.

Explanation: Hope it helps! :)

Answer:

false

Explanation:

the correct answer is Forensic Technology, Inc.

if a copper acetate hydrate, Cux(C2H3O2)y zH2O compound is found to contain 31.82% Copper, 59.14% acetate,and the remainder is water. What is the empirical formula of this compound ?

Answers

in empirical formulas, we find the minimum ratio to which the components of the compound are combined in.
Cux(C2H3O2)y zH2O 
first we need to write the percentages as masses and assume that in 100 g of the compound these are the masses of each compound its composed of
                  Cu                           C₂H₃O₂          H₂O
                31.82 g                      59.14 g        9.04 g
 molar mass
                 63.5 g/mol                 59 g/mol        18 g/mol
            31.82/63.5                    59.14/59        9.04/18
            = 0.5                             = 1.002          - 0.5
divide by the smallest number 
               0.5/0.5 = 1                   1.0/0.5 =2      0.5/0.5 = 1

Therefore x = 1
                y = 2
                z = 1
Cu(C2H3O2)₂ H2O 

What causes the Coriolis effect?
A. the different air movements north and south of the equator
B. the rotation of the earth on its axis
C. winds spinning off the equator
D. the friction that slows down winds near the earth's surface

Answers

It's B. The rotation of the earth on its axis.

scientists have determined the average salinity of ocean water to be equal to ___
a. 3.45 g/mL
b. 34.5 g/kg
c. 34.5 g/mL
d. 3.45 g/kg

Answers

Answer: b. 34.5 g/kg

The average salinity of the ocean would be 3.45% or 35 parts per millions(ppm). That means 3.45% of the ocean water weight would be contributed by salt. Water density is 1kg/liter or 1000g/1000ml.
Then, 3.45% of it would be: 3.45% * 1000= 34.5g/kg or 34.5g/l
Oh I just answered this its 34.5

Which would not be associated with stable atmospheric conditions

afternoon thunder showers is the answer

Answers

The correct answer is - afternoon thunder showers.

When we say stable atmospheric conditions it means that the atmosphere should be relatively calm, without having any disturbances in it. A nice example for a stable atmospheric conditions is a clear sunny sky and a calm wind. On the other hand, we have the afternoon thunder showers. The afternoon thunder showers are the total opposite of stable atmospheric conditions. When they occur, there's lot of disturbances, air pressures are mixing, the winds are changing speeds, heavy rainfall occurs, the air pressure changes rapidly, there's electrical charges, all in all creating a real mess in the atmosphere.

Answer:

afternoon thunder showers.

Explanation:

All moving parts produce friction. true or false

Answers

Hey there! :D

To some extent, all moving parts produce friction. It can be very small or minimal, but all parts produce some form of friction. 

This is true. 

I hope this helps!
~kaikers
The answer would most likely be true

describe how you would separate a mixture of water sand pebbles and paper clips

Answers

Answer:

Explanation:

Separation

Which of the following statements correctly describes the make-up and function of genes?

Genes are made of DNA and are carried on chromosomes.
Genes are not made of DNA, but they are carried on chromosomes.
Genes are made of chromosomes and carried on DNA.
Genes are not made of chromosomes but are carried on DNA.

Answers

Genes are made of DNA and are carried on chromosomes. 

Answer:

Genes are made of DNA and are carried on chromosomes.

What started the Russo-Japanese War?

Answers

Answer:

Late in the night on February 8, 1904, Japan launched a surprise attack against the Russian-held Port Arthur, along the coast of Manchuria, beginning the Russo-Japanese War.

Explanation:

hope this helps

Final answer:

The Russo-Japanese War started due to territorial disputes in Manchuria and Korea, with Japan launching a surprise attack on Port Arthur in 1904. Japan's victory altered international relations and signaled the rise of Asian military prowess against European powers.

Explanation:

The Russo-Japanese War began primarily due to territorial rivalries in Manchuria and Korea. In the winter of 1904, Japan initiated the conflict with a surprise naval attack on the Russian fleet at Port Arthur because of Russia's military presence in Manchuria and its refusal to recognize Japan's interests in Korea. Industrialization in Japan played a crucial role, enabling its military to achieve rapid victories over Russia. This conflict ended with the signing of the Treaty of Portsmouth in 1905, with Japan gaining control over Korea and parts of Manchuria. The war not only demonstrated Japan's industrial military power but also influenced international dynamics by challenging European influence in Asia and stirring political unrest within Russia.

Give the correct balanced equation for the single replacement reaction of magnesium with aluminum oxide. A) Mg + AlO → MgO + Al B) Mg + Al2O3 → MgO + Al C) 3Mg + Al2O3 → 3MgO + 2Al D) Mg + Al2O3 → MgO3 + Al2

Answers

Answer is "C".

Explanation

Single replacement reaction is a type of reaction which one reactant reacts with another and makes a product by replacing one element by another. 

Mg (Magnesium) reacts with Al₂O₃ (Aluminium oxide) and produces MgO (Magnesium oxide) and Al (Aluminium) as products. Here Al is replaced by Mg. Reaction is 
             Mg + Al₂O₃ → MgO + Al

To balance the reaction equation, both left and right hand sides should have same number of atoms in each element.
Here, 
 Left Hand Side has                                             Right Hand Side has
   Mg = 1 atom                                                         Mg = 1 atom
   Al = 2 atom                                                           Al = 1 atom
   O = 3 atom                                                           O = 1 atom

First step : balance the O atoms in both sides. To do that "3" should be added before MgO. 

Second step : After balancing O atoms, there will be 3 Mg atoms in right hand side. Hence to balance Mg atoms again "3" should be added before Mg in left hand side

Third step : as the final step balance the Al atoms by adding "2" before Al in the right hand side.

Then final balanced equation should be 
              3Mg + Al₂O₃ → 3MgO + 2Al



 

Answer is C

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This food chain is incomplete. Two groups of organisms are missing. One group of organisms that is missing are the producers, plants and other photosynthetic organisms. They turn sunlight into chemical energy. What is the other missing group and what do they do? A) Carnivores that eat only meat. B) Herbivores that eat only plants. C) Predators that prey on all other levels of consumers. D) Decomposers that recycle matter back into the food chain.

Answers

Answer:

D

Explanation:

USATESPREP

Answer:

D) Decomposers that recycle matter back into the food chain.

Explanation:

Molecular weight of PbCl2 = 278 g/mole Mass of beaker + PbCl2 = 62.19 g Mass of beaker = 57.77 g Mass of PbCl2 per 100 mL = g Moles PbCl2 per 100 mL = [Pb-2] based upon this investigation = M [Cl-] based upon this investigation = M

Answers

PbCl2--->Pb2+  +  2Cl-

The  mass   of  PbCl2   is   =mass   of  the  beaker+Pbcl2  minus   mass  of  the  beaker
that  is  62.19-57.77g=  4.42grams

moles  of PbCl2=  4.42g/278g/m0l = 0.0159moles

concentration  of  (Pb2+)
since  mole  ratio  of  PbCl2  to  Pb2+  is   1:1  therefore  the  moles  of  Pb2+  is  also  0.0159moles
concentration  =0.0159/100 x1000=0.159M

concentration  of  CI-  is  two  time  that  of  Pb2+  from  the  equation  above  therefore  concentration   of  Cl-  =  0.159 x2  =0.318M

Which 1.0 M acid solution has the largest concentration of hydronium [H3O+]?


HNO2



H2CO3



H2SO4



H3BO3


Answers

Answer:

H2SO4

Explanation:

OTHER ACIDS ARE WEAK ACIDS AND A VERY FEW AMOUNT OF H+ ARE RELEASED TO THE MEDIUM

Final answer:

The 1.0 M acid solution with the largest concentration of hydronium [H3O+] is H2SO4 (sulfuric acid). H2SO4 is a strong acid that completely ionizes in water, resulting in a high concentration of hydronium ions.

Explanation:

The 1.0 M acid solution with the largest concentration of hydronium [H3O+] is H2SO4 (sulfuric acid).

When an acid dissolves in water, it donates hydrogen ions (H+) to form hydronium ions (H3O+). The concentration of hydronium ions is directly related to the strength of the acid. In this case, H2SO4 is a strong acid, meaning it completely ionizes in water, resulting in a high concentration of hydronium ions.

On the other hand, HNO2 (nitrous acid), H2CO3 (carbonic acid), and H3BO3 (boric acid) are all weak acids, meaning they only partially ionize in water and produce lower concentrations of hydronium ions.

A 15 mL sodium hydroxide solution of unknown concentration is titrated with 34.5ml of 1.2M HCl solution. What was the concentration of the sodium hydroxide solution?

Answers

NaOH + HCl = NaCl + H20
From the reaction, it can be seen that KOH and HCl have the following amount of substance relationship:
n(NaOH):n(HCl)=1:1
From the relationship we can determinate that NaOH and HCl have the same number of moles:
n(NaOH)=n(HCl)=c*V=1.2M*0.0345L= 0.00414 mole
Now, when moles of NaOH is known, concentration can be calculated: 
c(NaOH)=n/V= 0.00414mole/0.015L= 0.276 M

PLEASE HELP! GIVING 22 POINTS!

PLEASE GIVE 2-3 SENTENCES!

An organism has the scientific name Canis lupus. Based on your knowledge of taxonomic categories explain how it is similar to and dissimilar from another organism, Canis latrans.

Answers

Differences-
Canis latrans (Coyte) is smaller than Canis lupus (Gray Wolf).
Similarities-
They are both canines and carnivorous.
Hope this helped!
~Wolfe<3

Answer:Differences are that Canis latrans/'Coyte' is smaller than Canis lupus/'Gray Wolf'. and the similarities are both canines and carnivorous

Explanation:

15 POINTS! HELP!!
The Doppler effect is used in police car to measure _______?

a) temperature
b) weather
c) speed
d) reckless driving

Answers

C. Speed they used a radar gun to measure speed

The answer to this question is:
c. speed

hope this helps
Other Questions
Due to his good credit history, Francis was able to purchase a home with a good interest rate on his loan. Assuming Francis has the ability to choose the length of his loan and the amount of the down payment, what method would help Francis decrease the total cost of the loan? Select the best answer from the choices provided. reducing the down payment increasing the length of the loan increasing the length of the loan and reducing the down payment reducing the length of the loan and increasing the down payment MARKING BRAINLEST!! Suppose the author changes the third sentence as indicated below:3The woman shown in Christinas World appears rather young, but in real life, the subject was a middle-aged woman. Wyeth, who lived in the Maine countryside, looked out his window one day and saw his neighbor crawling across the pasture. Many claimed that the woman feared she would contract a disease called polio, but no one knows for sure.Which would correctly identify the author's meaning for the word contract? Consider the effect of the stressed or unstressed syllable in the word contract.A)You should stress the first syllable, because it is a noun that means a binding agreement.B)You should stress the second syllable, because it is a verb that means to be stricken by an illness.C)You should stress the second syllable, because it is a verb that means to squeeze or press together.D)You should stress the first syllable, because it is a noun that means a scope with essential elements. A proton beam in an accelerator carries a current of 130 a. if the beam is incident on a target, how many protons strike the target in a period of 17.0 s? The practice of yellow journalism most influenced United states entry into which war simplify 6a^(2)-[-5-(9a^(2)-3a)]-[8+(-19a-8)] All governmental powers are held by a central government in a __________ system. The Civil Rights Act The following is an excerpt from Section 201 of the Civil Rights Act passed in 1964. Read the passage and answer the questions. Transcript of Civil Rights Act (1964) TITLE IIINJUNCTIVE RELIEF AGAINST DISCRIMINATION IN PLACES OF PUBLIC ACCOMMODATION SEC. 201. (a) All persons shall be entitled to the full and equal enjoyment of the goods, services, facilities, and privileges, advantages, and accommodations of any place of public accommodation, as defined in this section, without discrimination or segregation on the ground of race, color, religion, or national origin. (b) Each of the following establishments which serves the public is a place of public accommodation within the meaning of this title if its operations affect commerce, or if discrimination or segregation by it is supported by State action: (1) any inn, hotel, motel, or other establishment which provides lodging to transient guests, other than an establishment located within a building which contains not more than five rooms for rent or hire and which is actually occupied by the proprietor of such establishment as his residence; (2) any restaurant, cafeteria, lunchroom, lunch counter, soda fountain, or other facility principally engaged in selling food for consumption on the premises, including, but not limited to, any such facility located on the premises of any retail establishment; or any gasoline station . . .To whom does this law apply? A. Native AmericansB. Asian AmericansC. African AmericansD. All persons, no matter their race, color, religion, or national origin What were the lasting effects of the reconstruction period What did the Twenty-fourth Amendment do to help African Americans? What are the solutions to the equation x = 256? Several nations in the ussouthcom aor are leading the way on military human rights reform. they are making important advances in In which town is the play set ? in whar country do you suppose this town exists rome and juliet? An absolute monarch differs from a limited monarch because A. an absolute monarch is chosen by the legislature. B. an absolute monarch serves for a set number of years. C. an absolute monarch has no restrictions on his or her power. D. an absolute monarch is elected by the people. 17 POINTS. Find the x and y intercepts and show work please. Its number 2. y=x^4+2x^2-1 The image above is of the color wheel used by artists. If an artist wanted to create a artwork with analogous colors, how would he/she use the color wheel to achieve this result? a. The artist would want to decide on a single hue, and then he/she would use the neighboring colors to the left and/or right of the chosen hue. b. Each time the artist chose to use a certain hue, he/she would want to make sure that all hues next to it in the artwork are from the opposite side of the color wheel. c. The artist would want to choose a certain hue to begin, and then alter the hue by adding tint and tone to the hue to create values. d. The artist should consider only the intensity of the colors he/she uses, since all colors work well together so long as their intensities compliment one another. Rosalie earns extra money by working as a babysitter over the weekend. She charges $10 to drive to the home and an additional $8 per hour. What is the value ofy? Why does a negative number times a negative number equal a positive number? When jodi walks from the sunlight into a dark theater, her ________ cause(s) her ________ to enlarge to let in more light? A box of 20 Crunchy Munchy cookies costs $2.50 and a box of 40 Crunchy Munchy cookies costs $4.00. One quart of milk costs $1.50. Which of the following is a better bargain?