Chemistry Middle School

How do I solve this? Need an explanation and how to next questions are the same.

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Answer 1

Answer:

eee

Explanation:

Related Questions

What is an ellipse please help)

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normal oval shape traced by a point moving in a plane so that the sum of the distance from the other points is constant.

In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.

Maybe they might use that math thing for Science.

Ancient plants captured solar energy from the sun, which eventually produced

A.geothermal energy

B.fossil fuels

C.greenhouse gases

D.infrared radiation

Answers

Answer:I think it’s B. Fossil Fuels

Explanation:

ANSWER: Fossil Fuels

EXPLANATION: Most of the energy used by humans comes from fossil fuels, which are made up of ancient plant and animal matter that stored energy from the sun.

Match the term to its definition (Lessons 6.03, 6.04 and 6.05)
(i can't fit this all without confusion)

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Answer: the first paragraph is rain forest biome and the 2nd one is arctic tundra biome and finally the last paragraph is ocean or marine biome

Explanation:

rain forests have warm temperatures and include alot of animals and plants , artctic tundra biome includes cold temperatures ice stuff and all that and ocean or marine biome is pretty much just the ocean with seals , whales and marine life yk.

can u help me and ty...

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Third one down :))))))))

The answer would be it decreases the amount is input force needed

In an electrical wire, if instead of copper, plastic wire is used. Would it conduct electricity?Justify your answer.

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Answer:

No, a plastic wire would not conduct electricity. This is because plastic is an insulator that does not allow electric current to flow through it. In a wire, electrical conductivity is provided by the movement of charged particles - typically, electrons. Copper is an excellent conductor of electricity because it has a high number of free electrons that are not bound to atoms and can move through the wire very easily. However, in a plastic wire, the tightly bound electrons of its atoms do not allow for the free flow of charges, thus preventing the passage of electric current.

No it would not conduct electricity as it is a insulator

How does an atom change if all of its electrons are removed?
p.s. I'll mark the first answer the brainliest if it is correct! ;)

a. The atom’s volume increases.

b. The atom’s mass increases.

c. The atom becomes positively charged.

d. The atom becomes negatively charged.

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c. The atom becomes positively charged

if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom

C the atom becomes positively charged

3. The Earth's core is about the size of

A. Saturn
B. Pluto
C. The United States
D. New York City

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C. The United States

C. The United States

Earth's CoreEarth's interior is layered like an onion. The solid iron-nickel inner core — today 1,200 kilometers (745 miles) in radius, or about three-quarters the size of the moon — is surrounded by a fluid outer core of molten iron and nickel about 2,400 kilometers (1,500 miles) thick.The core holds a much bigger stash of radioactive material than anyone had suspected, and its decay is giving off heat.

It is said that the Earth's core is about the size of the United states.

Thus, the correct option is C.

Learn more:

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3. The Earth's core is about the size ofA. SaturnB. PlutoC. The United StatesD. New York City

The initial water volume in this container was 10.0 mL. When the key was submerged, 3 volumes of displaced water were collected: 0.7 mL, 0.8 mL, and 0.9 mL. What is the volume of the key?
How did you find the volume?

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The volume of the key is 0.8 mL.

Volume of objects using sinker method

An object that floats on water will displace its own volume. In the same vein, an object that sinks in water will displace its own volume.

Thus, in order to find the volume of an object that sinks in water, measure the volume of water that it displaces.

In this case, the water displaced by the key was measured 3 times. The average of the 3 readings will give the volume of the key.

Volume of the key = 0.7 + 0.8 + 0.9/3 = 0.8 mL

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Answer:

Explanation:

so 10.0ml -3ml

0.7+0.8+0.9ml = 0.0024 liters

How to work out the relative mass of potassium? What is the calculation? ( explained very easily )

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Answer:

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

Relative Atomic Mass = Mass of one atom
———————————
(1/12)th Mass of one C12 atom

Which phase of matter can be described as having molecules that are tightly packed together with a definite shape?

A. gas
B. solid
C. plasma
D. liquid

Answers

Solid!! Because a gas has very loosely packed molecules and a liquid has somewhat loosely packed molecules! :)

Answer:

D. Liquid

Explanation:

Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. It will take the shape of its container.

Which of the following is a biotic factor in a biome?

a
kinds of birds
b
amount of rainfall
c
types of rocks

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Answer:

i guss c is answer in my ......

Answer:

a kind of birds is a biotic factor

Identify two characteristics shared among transverse waves, longitudinal waves, and surface waves.

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Answer: For transverse waves, the waves move in perpendicular direction to the source of vibration.

For longitudinal waves, the waves move in parallel direction to the source of vibration .

They are similar within the sense that energy is transferred within the kind of waves.

Explanation:

The shared characteristics between traverse, longitudinal and surface waves include :

Traverse, longitudinal and surface waves are all mechanical waves

They only transport energy without transporting matter.

Mechanical waves are simply waves which requires a material medium to propagate. They include longitudinal, surface and traverse waves.

Also, all three waves transfer energy through a medium without the transfer of materials or matter in the medium.

Therefore, all three waves are mechanical waves and do not transfer matter.

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HELP PLEASEEE
How do we know what is inside the Earth? (How do we know the Earth has layers?)

(if you put a random answer for the points i will report)

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Scientists know about the layers of the earth by sending sound waves through the earth. Because layers of different densities will allow sound waves to travel through them differently, we can study the sound waves to understand the layers of the earth.

Scientist use special technology to figure out what is inside of the Earth

Explain why stomach acid must be neutralized after it leaves the stomach.

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Proper digestion in the stomach can only happen within a narrow pH range, and when we neutralize stomach acid, the domino effect is thrown off. Without adequate gastric acid, many vitamins, minerals, proteins, and amino acids cannot be absorbed.

That kay person is right I learned it in class and my teacher even said the same thing.

(science but there wasnt a science option) HELP!!!! PLEASEEEEEEEE

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What is the question?? Do you need to write a paragraph or present a presentation?

What physical property of mercury makes it best suited for use in a thermometer

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Answer:

High coefficient of expansion

Explanation:

It is only mercury that is in liquid form at room temperature. It works on the principle of thermal expansion, it expands when heated and contracts when cooled. The very minute change can be notable by the use of mercury in the thermometer. So this property of the thermometer makes it suitable for measuring temperatures.

High coefficient of expansion

help me fill this page with the right answer please (17 lines minimum please)

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I am water moleculeI have to first bear the heat of sun .Then the heat evaporates me into vapours I am send to the atmosphere with my brothersThen I have to form clouds Then precipitation or density of our brothers increasesWe keep increasingThen once a time comes when we are full We then condensed down to earthWe comes back in the form of rainThen either we are stored in some place or undergroundThen people collects us from different places like pond,river etc

Hey Lenny lately I’ve been having a rough time in the water cycle. It all started when I was chilling in my favorite location the “glaciars” and suddenly the sun turned me into liquid form. Next thing I know I am hurdling down a river straight into a massive lake. Personally this is my least favorite stage of the water cycle because of kids and bacteria that lurk in the water, very scary things. I didn’t stop at the lake very long, and instead sunk into the soil in a process called collection so I could become ground water. Underground reservoir’s are much more peaceful then lakes and I wanted to stay there. However I was forced up a water well pump shortly after and sent through a long tube. Me and couple of the friends I met on the way were all dispersed over a giant grass feild. Many molecules in the group were captured by the hostile plants but I escaped through the means of evaporation. Currently I have condensed into cloud form and I am roaming the skies looking for you, when you get this let me know and I’ll percipitate in your area! P.s I found this photo of us freezing over in the ice age lollll.

What is the charge on the Cr in Cr2O72-

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Answer:

+6.

Explanation:

So, a chromium atom here has an oxidation number of +6.

In the dichromate ion, the oxidation number of chromium is+6. The sum of the oxidation numbers in Cr2O72-, a polyatomic ion, is -2, the charge of the ion.

Less than 3 percent of water on Earth is freshwater found in rivers, lakes, and streams with most of the freshwater frozen in ice caps and glaciers. Freshwater is the only type of water that people and other land animals are able to drink to survive.

True
False

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True, less than 2.5% of that water is inaccessible.

This is in fact true. Freshwater is the only water that is safe for drinking for us living beings! It is in fact below 3 percent

BRAINLIEST IF CORRECT (FILL IN THE BLANKS)

Options for the first blank

absorbs
reflects
refracts

Options for the second blank

slows down
speeds up

Options for the third blank

continue in a straight line path
bend and change directions

$BRAINLIEST IF CORRECT (FILL IN THE BLANKS)Options for the first blankabsorbsreflectsrefractsOptions for$

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First blank: refracts

Second Blank: speeds down

Third Blank: bend and change directions

Answer:

Explanation:

djdjdjd

The Law of Conservation of Energy states...

A) energy cannot be created, but it can be destroyed and change forms
B) energy cannot be created, destroyed, or change forms
C) energy cannot be created or destroyed, but it can change forms
D) energy can be created, destroyed, and can change forms

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Answer:

C) energy cannot be created or destroyed, but it can change forms

Explanation:

The correct answer is C. :)

What are the 3 properties of metals?

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Answer:

lustrous durable highly malleable

Explanation:

brainliest plz

High melting points
High density
Good conductor of heat and electricity

Do magnets work underwater? How about in space? Explain your reasoning.

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Answer:magnets work underwater the same as they do in air or in a vacuum.

Explanation : Water is almost completely non-magnetic, so magnets work underwater the same as they do in air or in a vacuum.

yeah, the magnetic force isnt changed by its environment since the environment is not magnetic at all

Help me please I don’t understand

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Answer:

1:Natural selection

2: competition

Natural selection; the process by which organisms with variations most suited to their local environment survive and leave more offspring.

Competition: The struggle between organisms to survive in a habitat with limited resources (food, water, shelter)

Natural selection and competition :)))))))

I WILL GIVE YOU BRAINLIST PLS DOOOOOO
Which of these is a characteristic of index fossils?

Found in the topmost rock layer

Found in many layers of the same rock

Have already established relative age

Are limited to a particular geographic location

Answers

Answer: It is the third one.

Explanation:

An index fossil is something that a human can estimate the age of the fossil by looking at it.

The answer is the third one.

Index fossils are distinct in nature and recognisable. It is also widely present across the world. It is abundant and found everywhere.

Giving brainliest 4 best answer :> ~~

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Answer:

there are blanks in the picture. what kind of winds are being asked about?

Has negative values

Group of answer choices

Celsius and Fahrenheit

Celsius and Kelvin

Fahrenheit and Kelvin

Answers

Answer:

Explanation:

Celsius and Fahrenheit

They have negative values but not Kelvin as its lowest is O Degree Kelvin.

Hope this helps!

BRAINLIEST ME PLS!!!

rannnnnnnnndy are u there

Answers

Answer:

i-um yes. i'm randy, totally not an imposter.

Explanation:

What is the center of a plant cell? The actual question is what’s the center of an onions root tip?

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The center of a plant cell is a nucleus!

A nucleus! That is where the plants DNA is stored :)

In an exothermic reaction, chemical energy is converted to _____.

1.thermal
2. mechanical

Answers

Thermal
Because exothermic is having to do with energy

The chemical reactions are generally of many types. The exothermic and endothermic reactions are important among them. In an exothermic reaction the chemical energy is converted to thermal energy. The correct option is 1.

What is exothermic reaction?

The chemical reactions which proceed with the evolution of heat energy are defined as the exothermic reactions. The chemical reactions which proceed with the absorption of heat energy are called endothermic reactions.

In an exothermic reaction, system loses heat to surroundings. Since heat is given out in exothermic reactions, the enthalpy of the products will be less than that of the reactants.

In exothermic reaction, q will be negative and the enthalpy change will be also negative. In this reaction chemical bonds are broken and new bonds are formed. The chemical energy is converted to kinetic energy which is released as heat.

Thus exothermic reaction releases thermal energy.

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Other Questions

A system of linear equations with more equations than unknowns is sometimes called an overdetermined system. Can such a system be consistent? Illustrate your answer with a specific system of three equations in two unknowns. Choose the correct answer below. A. No, overdetermined systems cannot be consistent. because there are no free variables. For example, the system of equations below has no solution. x_1 = 2, x_2 = 4, x_1 + x_2 = 24 B. No, overdetermined systems cannot be consistent. because there are fewer free variables. For example, the system of equations below has no solution. x_1 = 2, x_2 = 4, x_1 + x_2 = 12 C. Yes, overdetermined systems can be consistent. For example, the system of equations below is consistent because it has the solution variables than equations. For example, the system of equations below has no solution. (Type an ordered pair.) x_2 = 4, x_1 + x_2 = 6 D. Yes, overdetermined systems can be consistent. For example, the system of equations below is consistent because it has the solution (Type an ordered pair.) x_1 = 2, x_2 = 4, x_1 + x_2 = 8 Fred is 5 inches shorter than the quotient of Ricks height and 4. let r represent Ricks height. Write an expression that represents Freds height which of the following can be a group policy object(gpo)be linked to?(choose 3) In two paragraphs, What product or service will your company provide? What need of the customer will it fill? What were some things you noticed about this episode of Shark Tank? Go in-depth. This is a good example of how start up companies have to pitch their ideas to investors. Find the median and mean of the data set below:14, 25, 41, 4, 23, 8, 32 a. Suppose you are measuring the length of the stream frontage along a piece of mountain property. You begin with a 10 -meter ruler and find just 25 element along the length of the stream frontage. When you switch to a 1-meter ruler, you are able to trace finer details of the stream edge and you find elements along its length. Switching to a 10-centimeter ruler, you find 625 elements along the stream frontage. Based on these measurements, what is the fractal dimension of the stream frontage? What happened to Marguerite and Bailey after they laughed in church? Which step in the reverse-engineering process involves the identification of subsystems and their relationship to one another? An 81-kg baseball player slides into second base. The coeffi cient of kinetic friction between the player and the ground is 0.49. (a) What is the magnitude of the frictional force What measures can be implemented to improve peoples quality of life and standard of living? If you roll two fair six sided die, what's the probability the sum is 5 or lower? What is the probability of flipping a coin 12 times and getting heads 5 times?Round your answer to the nearest tenth of a percent.OA. 12.1%OB. 3.1%OC. 19.3%OD. 5.4% what are all the different lines help me2. Marissa is playing a game using the spinner below. CRedBlueRedBlueCWhich tree diagram shows all the possible outcomes that Marissa can getwhen she spins the arrow twice? someone help me please ill give brainly Olivia measures the heights of two trees and the lengths of their shadows. She notices that the height of each tree and the length of its shadow are directly proportional. One of the trees has a height of 15 m and a 10 m long shadow. The other tree has a 14.4 m long shadow. Calculate its height, in metres (m). Give any decimal answers to 1 d.p. 15 m 10 m ? m 14.4 m what kind of pallet jack should be used for handling paper rolls 18.9 divided by 0.7 i need help How do you know the system is in acceleration, deceleration or in steady state operation? (Assume that T - T = Td) If Td > 0, the speed in the acceleration, deceleration or not change? If Td Halloween can be traced back to a celtic holiday. Whats the name of that holiday?.