Chemistry Middle School

Communication has been a part of human history since the beginning of our time on Earth. There have been countless forms of communication during that time. Describe and provide an example of three forms of communication that humans used before computers were invented.

Answers

Answer 1

Answer:

1. Morse code - letters are represented by combinations of long and short signals of sound or light

2. Paper letters - It could take some time to get letters delivered but never the less it was a form of communication

3. Vocal noises - Making a noise that would have a specific meaning

Explanation:

Answer 2
Wall art: Recounting experiences to share with others who see the wall through time

Written Language: Used to spread messages to people

Sign Language: Used to nonverbally communicate with other people

Related Questions

Morse code was invented and first used before the invention of the telephone. Explain how using electronic pulses to send messages in Morse code would have been an advantage over using your voice.

Answers

Answer:

Using electronic pulses to send messages in morse code would be an advantage over using your voice because not everyone could understand morse code. If you wanted to send a message and didn't want someone to overhear you say it you could use morse code to send the message quietly. Seeing that everyone doesn't know morse code you could send almost secret messages using it.

Explanation:

ANSWER-

Using electronic pulses to send messages in Morse code was an advantage over using voice because it allowed for long-distance communication without the need for a physical connection, such as a telephone line. The signals could be sent over telegraph wires or even through air, making communication faster and more efficient. Additionally, Morse code could be sent silently, making it ideal for covert communication.

Match each letter with the correct label. Use the atom diagram below.

Electron - Nucleus - Proton - Neutron

Answers

D= nucleus
C= protons
B= neutron
A= electron

Answer:

Explanation:  First and foremost, we must carefully examine the provided diagram in order to properly name the sections of an atom diagram.

Step-by-step instructions are given along with the answers in sequential sequence.

Correct answer for (A) is Electron since they are present at the outermost shell of an atom.The correct answer for (B) is Neutron since it is the central element of an atom.The proton is the right answer for (C), as it is included in the nucleus grouping with the neutron.The nucleus is the correct option for (D) since it is the primary component of the atom and includes both protons and neutrons.

Learn more about the Atom here:

https://brainly.com/question/12578802

List the five physical phase changes of matter and give one example for each.

Answers

Answer:Melting.

Freezing.

Evaporation.

Condensation.

Sublimation.

Explanation:

Answer: Examples for the five transformations previously given.

For the first four, we encounter common examples in everyday life, all to do with water:

Freezing - liquid to solid, e.g. water to ice, e.g. making ice cubes.

Melting - solid to liquid, e.g. ice to liquid water, melting ice cubes or snow flakes.

Condensation - gas to liquid, e.g. water vapor (gas) to liquid -  water vapor in air (humidity) condenses to form liquid droplets on the outside of a cold beverage glass on a hot humid day; or cloud formation  in the atmosphere.

Evaporation - liquid to gas, e.g. liquid water on clothes evaporates as clothes dry on clothesline or in dryer

While water can sublime under certain conditions of temperature and pressure, it is less evident in everyday life.  Carbon dioxide however is a more common example.

Sublimation - solid to gas, e.g. "dry ice" disappearing. The visible smoke associated with dry ice is most likely just condensing water vapor in the air as the solid carbon dioxide cools the air.

Explanation:

How is a mixture different from a pure substance?


A) Mixtures can be separated by physical means.

B) A pure substance is heterogeneous.

C) Pure substances are made up of mixtures.

D) A mixture is made of one substance.

Answers

Explanation:

Neani madhungo haya thoho I a teaho

B, A pure substance is heterogeneous

What is the number above each symbol in the periodic table?
A.atomic number
B. chemical symbol
C.atomic mass
D.none of the above

Answers

A. Atomic Number is the answer.

Answer:

atomic number

Explanation:

there are 118 elements. Some tables includes on the right side of the symbol is the atomic mass.

Hope this help. :)

What has compounded the tremendous increase in human population in the last few decades? Select all that apply.
agriculture
houses
technology
tools

Answers

Answer:

technology

Explanation:

because people will go to placed with more technology

Technology
Because technology has influenced our way of thinking and understanding

A cup of coffee is considered a _______.

A) precipitate
B) solute
C) solution
D) solvent

Answers

Answer:

C) solution

Explanation:

Solution is made of solute and solvent. Here coffee beans are solute and hot water is solvent when combined in right proportions make the coffee, a solution.

C-solution hope this helps i hade the question my self
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