CHEMISTRY MIDDLE SCHOOL

List the number of atoms for each element in this compound: CaCO 3

Answers

Answer 1
Answer: calcium: 1
carbon: 1
oxygen: 3
Answer 2
Answer:

YEP THAT THGE ASNWER 1,1,3

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How could you tell if a sample of matter is a element

Answers

Terms of good sample

In general, a good sample is which can represent as much as possible the characteristics of the population. In the language of measurement, meaning that the sample must be valid, which can measure something that should be measured. A valid sample is determined by two considerations.

First: The accuracy or precision, the degree of absence of "bias" (error) in the sample. In other words, the less the error rate is in the sample, the more accurate the sample. Benchmarks for "bias" or error is population.

Cooper and Emory (1995) states that "there is no systematic variance"that means is there is no diversity of measurement due to the influenceof known or unknown, which led to scores tend to lead to a certainpoint.

Second: Precision. The second criterion is to have a good sample estimate of the level of precision. Precision refers to the question of how close we are to estimate population characteristics. There has never been a sample that can fully represent the characteristics of the population. Therefore,in each sampling always attached keasalahan-error, which is known as"sampling error" Precision is measured by standard deviation (standarderror). Thesmaller the difference between the standard deviation obtained from thesample (S) with a standard deviation of the population (s), the higherthe level of precision. Thoughnot always, the level of precision may be increased by adding thenumber of samples, the fault may be reduced if the number of samplesplus (Kerlinger, 1973).

How is the telegraph you made like the one morse made?

Answers

it developed in the 1830s and 1840s by samual morse and other inventors, the telegraph revolutionized long-distance communication. 

Answer:

it developed in the 1830s and 1840s by Samual Morse and other inventors, the telegraph changed long distance communication.

Explanation:

Using the time period, the ability to use telegraphs on moving trains came to be shortly after.

Which type of bond is salt

Answers

Answer:

An Ionic Bond

Explanation:

Salt compounds are formed by the "donating" of electrons.

Answer:

NaCl, or Salt, is an ionic bond.

Explanation:

Ionic bonds are formed from one metal and one nonmetal, Sodium being the metal and Chlorine being the nonmetal.

Many insulating materials contain spaces filled with air because air is what type of material?

Answers

Many insulating materials contain spaces filled with air because ; Air is a poor conductor of heat and electricity

Insulators are materials that do not allow the easy passage of heat  or electricity through them. they are used to protect users from direct exposure to electricity and heat and also for the protection of equipment's at home and at work places.

Insulators are generally bad conductors of heat and electricity. some examples of insulators are ;

  • Dry wood,
  • Air,
  • Porcelain,
  • Rubber,
  • Plastic and glass

They are all very good insulators. but the most commonly used insulator in electrical installations is Porcelain

Hence we can conclude that many insulating materials contain spaces filled with air because Air is a poor conductor of heat and electricity.

Learn more : brainly.com/question/17726401
It is because air is a poor conductor of heat. Good luck ;)

True or False?
A strong acid is safe as long as it's in a dilute solution

Answers

It should be true because a dilute solution is a mixture that has only a little solute dissolved in a certain amount of solvet.So true 
true.(i think) if I'm wrong ask a friend who knows

Can you put this in order from least to greatest for me

{335 B.C. 430 B.C. 400 B.C.}

Answers

First it's 335 B.C. , next it's 400 B.C. , then lastly it's 430 B.C.  

The same way you put this in order from "least to greatest" ... It's just like Mathematics terms of "least to greatest" .. Just with 'B.C.' added to it 
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