Chemistry Middle School

Type a sentence or two about early models of telephones. Include its description.

Answers

Answer 1

Answer:early models of telephones were used with a twirl of numbers

Explanation:

Not advanced technology

Answer 2

Answer:

flip phone

Explanation:

they fliped and it was small and u ddint have many games back then it was the phone after the twirling phone

Related Questions

Quickly pleaseeee

I know it's already answered but that was an accident

Answers

Answer:I thiink your right tbh

Explanation:

Answer:

Im 99% sure its sodium and potassium

Explanation:

What kind of change, physical or chemical, is happening when wood burns? How can you tell?

Answers

Answer:

Wood changes chemically to carbon dioxide when it burns and leaves a residue of ashes. These ashes cannot be changed back to wood. So it is a chemical change.

chemical
physical means it can go back to its shape; chemical it cannot.
for example when wood burns you can’t get that wood back to before it was burned!

hope this helps!

When balancing a chemical equation, which of the following are you allowed to do?

Take away substances

Add coefficients

Change subscripts

Add new substances

Answers

You are only allowed to Add coefficients

Answer:

Add Coefficients

Explanation:

You CAN'T change the identity of an element or substance in an equation. You can only change coefficients.

I need help QUICKLY!!!!!!!!

Answers

Answer: Do you take Ms. Reyes

Explanation: The answer is Outside air, Nose, Lungs, Bloodstream, Cell

Answer:

outside air

nose

lungs

bloodstream

cell

How did the peak of Mt. Everest rise from sea level to 8,848 feet?

Answers

Answer:

The height of Everest. Controversy over the exact elevation of the summit developed because of variations in snow level, gravity deviation, and light refraction. The figure 29,028 feet (8,848 metres), plus or minus a fraction, was established by the Survey of India between 1952 and 1954 and became widely accepted.

Answer:

The height of Everest. Controversy over the exact elevation of the summit developed because of variations in snow level, gravity deviation, and light refraction.

Explanation:

After Eris was discovered, scientists had to decide whether to count it as a planet. Why did this make them question whether Pluto should still be counted as a planet?
a
because Pluto and Eris are both space objects
b
because Pluto and Eris were discovered at the same time
c
because Pluto and Eris are very different
d
because Pluto and Eris are very similar

Answers

Answer:

After Eris was discovered, they had to decide whether Eris was a planet or not. If they decided it wasn't a planet, they had to also decide whether Pluto should be counted as a planet since Eris and Pluto were quite similar. They were the same size, and they were both part of the Kuiper Belt.

Explanation:

Planets are the celestial bodies that are not fixed. Pluto should be counted as a planet was a question as both Pluto and Eris were similar.

What are Pluto and Eris?

Pluto is now considered a dwarf planet and is found in the Kuiper belt that is present beyond the planet, Neptune. Similarly, Eris is also a dwarf planet.

Eris is the second-largest dwarf planet and is very similar to Pluto. The discovery of Eris questioned whether Pluto should be considered a planet.

Both the planets Pluto and Eris were similar in size and were part of the Kuiper Belt leading to the question of whether they should be a planet or not.

Therefore, option d. Pluto and Eris are very similar.

Learn more about Eris here:

https://brainly.com/question/15105153

Which formation is one feature of karst topography?

caves
kettles
meanders
oxbow lakes

Answers

Answer:

caves, Karst describes a distinctive topography that indicates dissolution. Karst terrains are characterized by the presence of caves, sinkholes, sinking streams, and springs. Understanding caves and karst is important because as much as a quarter of the world's population depends upon freshwater supplied from karst areas.

Explanation:

hope this helps have a good rest of your night :) ❤

The formation that serves as one feature of karst topography is Caves.

Karst topography can be regarded as a landscape with features of cave and sinkhole.

It is usually found in regions that consists plentiful rainfall in which the bedrock have some carbonate-rich rock.

Other characteristics of Karst topography are:

fissures underground streams. Sinkhole

Therefore, option A is correct because cave serves as as a formation of feature of karst topography

Learn more about karst topography at:

https://brainly.com/question/2794887

How is science based on observation used as evidence? How can evidence be used?

Answers

Answer:

Explanation:

Researchers gather empirical evidence through experimentation or observation. Empirical evidence is information acquired by observation or experimentation. Scientists record and analyze this data. The process is a central part of the scientific method.

Answer:

Science Produces Explanations That Can Be Tested Using Empirical Evidence. Science requires that scientific explanations of phenomena be based on events or mechanisms that can be observed in the natural world. This is how science builds a base of shared observations and ideas to which new knowledge can be added.

Explanation:

Name 3 things that rainforest and deserts have in common

Answers

Some similarities between deserts and rainforests are that they support complex ecosystems, are powered by the sun/photosynthetic plants, are dangerous/mostly uninhabitable for humans, due to both conditions and wildlife, and are found mostly in the tropics

Answer:

(1) The animals are adapted to survive in the conditions of the environment. (2) Both environments are inhabitable for humans. (3) They can both be deadly

Explanation:

I really hope this helps. Good luck hun

Select all of the compounds.
Group of answer choices

water (H2O)

gold (Au)

nitric acid (HNO3)

cobalt (Co)

oxygen (O2)

Answers

Compounds have more than one element

H2O
HNO3

Hurry
A student uses this diagram to understand the parts of a fish. The student then uses an identification key to classify different types of fish.



Based on the key, which of these fish is most likely a bluegill?

The ferst imige is for the qwestion the rest are the answers

Answers

Answer:

The 3rd image is a blue gill

___________________ can be renewable or nonrenewable.
isn't it fossil fuels? i'm not sure

Answers

Answer:

wood, aluminum, gemstones, fabric, paper, rock and many others can be renewable or nonrenewable.

Hope i get brainliest

Explanation:

Fossil fuels is indeed correct.

discord anyone? RaTqUeEn2#8785

Deforestation is the __________.
A.
cutting down or burning of all the trees in a forested area
B.
replanting of trees in an area where trees were cut down
C.
managing of forests for the benefit of people
D.
adding of nutrients to topsoil in order to make land more arable

Please select the best answer from the choices provided
A
B
C
D

Don't have to answer!

Answers

The answer would be letter A
The answer is A I’m answering because I need points

Would the following atoms have similar reactivity?

A) Elements in Group 2 have 2 energy levels.

B) Elements in Period 7 have 7 valence electrons.

C) Elements in Group 13 have 13 valence electrons.

D) Elements in Group 13 have 13 valence electrons.

Answers

I think D, not sure though!
Ur answer is d elements is group 13 have 13 valence electrons

The diagram represents liquid water in a pan on a hot plate. The liquid water is boiling and changing into water vapor. The process of boiling water is considered to be a

Answers

Answer:

I guess c?

Explanation:

take my answer by a grain of salt but the process of boiling water leads to physical change because eventually all water will become water vapor if boiled long enough

C is the answer to this question hope it’s right

What are the different layers of the Earth, and how do they interact?

Answers

Crust, mantle, outer core, inner core.
Crust, metal, outer core, inner core

The edges of South America and Africa seem to fit together like a puzzle.
A.true
B.false

Answers

Answer: true

Explanation:

Answer:

It's true...

Explanation:

Acceleration due to gravity =


100 m/s2



9.8 m/s2



62.3 m/s2



1.2 m/s2

Answers

Answer:

9.8

Explanation:

no explanation bbbbnnnnnnnnnnnnnnnnnnn

9.8m/s2 is the correct answer

the fossils in line 4 __ are the ones in line 1

Answers

I’m sorry I didn’t understand can you please add more details please thank you
Fossils in line 4 are older than the ones in line 1. Fossils in line 1 are the youngest.

Is this true or false
Titanium dioxide is used in sun block and to treat cotton in clothing, but is dangerous for human use.

Answers

I’m pretty sure it’s true!

happy to help:)
It’s False
I took a test with that question

please help!!!!!!!!!!!!!!!!!!!

Answers

Answer:

Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. Breaking down sugar produces the energy your body needs.

Explanation:

Brainly pls

True or False: Thermal energy can not transfer when particles of matter are in direct contact with each other, as they are not in solids, liquids,or gases.

Answers

Answer:false

Explanation:

that would be false hope it’s right !!

Please help I will give brainlist

How would you write the formula for sugar-water solution if the formula for salt-water solution is written as NaCl(aq).


The formula for solid salt is NaCl(s).


The formula for solid sugar is C6H12O6(s).

Answers

Answer:

Explanation:

The chemical or molecular formula for sucrose is C12H22O11.

PLEASEE HELP ASAP WILL MARK BRAINLIEST
This is on Asexual reproduction and I don't understand this at all so pleasee help

Answers

Answer:A,A,b,b

Explanation:i think i am learning this right now too!

I believe it is A, A, C, D

2. A change in velocity (speed and/or direction) is... *
A.speed
B.Velocity
C. Acceleration

Answers

acceleration cause that is a magnitude
the answer is acceleration

Describe how fossil fuels are converted into usable energy
:)

Answers

Answer:

Fossil fuel power plants burn coal or oil to create heat which is in turn used to generate steam to drive turbines which generate electricity.

Explanation:

Fossil fuels are used in power plants to make steam. Steam drives turbines which coupled to generator produce electrical energy. Electrical power is used in all industries, domestic used where energy is needed.

petroleum products like oil, gas are used in motor vehicles, ships, airplanes. They burn and give the power for transport.

Fossil fuels are burned under different conditions in engines, boilers, etc which produce heat energy and then converted into mechanical energy.

gas and oil are used to heat homes.

Answer: HEY HAVE A GREAT DAY

fossil fuels are converted into usable energy by first collecting, and then I'm pretty sure its turned into gas and turns turbines.

Explanation:

Fossil fuel are energy buried within the earth that could used as energy source for consumption. Most sources of earth's energy comes from fossil fuels

I DId this in class and asked on brianly

PLS MARK ME BRAINLIEST

A chemist is using 341 milliliters of a solution of acid and water. If 16.1% of the solution is acid, how many milliliters of acid are there? Round your answer to the nearest tenth.

Answers

We need to assume that the acid in question is a liquid (not a solid or a gas),

and we need to assume that the 16.1% is specified as 16.1% (v/v) ,

where "v/v" means volume in volume,

meaning 16.2 milliliters of that acid are contained in 100 milliliters of the solution of acid and water.

With those assumptions, the ratio of acid volume to solution volume is

x/342 = 16.1/100 , where x= number of milliliters of acid in the 342

milliliters of solution.

x/342 = 16./100 ---> x=342x16.1/100 ---> x=55 (Rounded)

What is the influence of temperature on a chemical change?

Answers

Answer:

Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.

Explanation:

Please mark me brainliest

Plz HELP ITS SCIENCE!

Answers

Cell wall:
-acts like a skin
- most selectively controls what is inside and outside of the cell
-rigid

Cell membrane:
-gives a plant cell
-not rigid
Cell Wall
1) Acts like skin.
2) Rigid.
3)Gives the plant cell its shape.



Cell Membrane
1) is not rigid.
2) More selectively controls what goes in and out of the cell.

1. The ocean is also known as Earth's _____. *
A. evaported cloud
B. Giant Collector
C. Condensed Liquid
D. None o the above

Answers

Answer:

Earth is often called the ocean planet because it is 70% covered in water.

Explanation:

D.

D. none off they above because the ocean isnt a cloud it doesn’t collect things and its not condensed
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Question 2 options: Organism Tissue Organ System Greek Theatre WorksheetGreek dramas were performed during what years in Greece?(approximately)___________________________________Theatre originated from Greek religious festivals honoring who? ________________________________Who wrote Greek Tragedies:_____________________________________________________________Who wrote Greek Comedies:_____________________________________________________________What type of play made fun of Greek Legends(ex comedy/tragedy):_______________________________________________Where did greek plays usually come from? _________________________________________________________Greek plays usually centered around what 3 things? __________________________________________________Where were Greek plays typically performed? ______________________________________________________Who is Aristotle and what did he contribute to Greek Theatre?_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________What are Aristotles 6 Elements of Drama 1.________________________________________________________________________________________________________________________________________________________________2.________________________________________________________________________________________________________________________________________________________________3.________________________________________________________________________________________________________________________________________________________________4.________________________________________________________________________________________________________________________________________________________________5.________________________________________________________________________________________________________________________________________________________________6.________________________________________________________________________________________________________________________________________________________________Explain what raked seating means: __________________________________________________________________________________________________________________________________________________________________List 3 characteristics of a Greek chorus.a.___________________________________________________________________b.___________________________________________________________________c.___________________________________________________________________List 7 functions of the Greek chorus.a.___________________________________________________________________b.___________________________________________________________________c.___________________________________________________________________d.___________________________________________________________________e.___________________________________________________________________f.___________________________________________________________________g.___________________________________________________________________What information did the Chorus give the audience?________________________________________________________________________________________________________________________________When did the Chorus usually sing and dance?_____________________________________________________________________________________________________________The Chorus often acted the ideal spectator. What does this mean?_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Why were masks used to perform plays in this time period? __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Give 3 characteristics of masks.a.___________________________________________________________________b.__________________________________________________________________c.___________________________________________________________________ GIVEAWAY 100 POINTSS HOPE YALL ENJOY URGENT URENT BRAINLIEST Vicky attends a private school where she must wear a uniform. 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