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3 years ago

BRAINLIESTTT ASAP!! PLEASE HELP ME :)

Chemistry

2 answers:

Naya [18.7K]3 years ago

8 0

There are many different types of theories that explain the concept of reliability in a scientific way.

- A test is reliable if we get the same results repeatedly

- When a test gives consistent results

We've covered that a test is reliable when it provides consistent results. In order to establish reliability, researchers establish different types of procedures.

Split-Half Reliability: The method of dividing the test into two equal halves and assessing how consistent the scores are.

Test-Retest Reliability: Which is the method of using the same test on two occasions in order to measure it's consistency.

horsena [70]3 years ago

3 0

Answer: Hard working,satisfied. (i think)

~Please mark as brainiest~

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Enter your answer in the provided box. The atomic masses of 63Cu (69.17 percent) and 65Cu (30.83 percent) are 62.94 and 64.93 am

dybincka [34]

Answer: The average atomic mass of copper is 63.55 amu.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For $_{29}^{63}\textrm{Cu}$ isotope:

Mass of $_{29}^{63}\textrm{Cu}$ isotope = 62.94 amu

Percentage abundance of $_{29}^{63}\textrm{Cu}$ = 69.17 %

Fractional abundance of $_{29}^{63}\textrm{Cu}$ isotope = 0.6917

For $_{29}^{65}\textrm{Cu}$ isotope:

Mass of $_{29}^{65}\textrm{Cu}$ isotope = 64.93 amu

Percentage abundance of $_{29}^{65}\textrm{Cu}$ = 30.83 %

Fractional abundance of $_{29}^{65}\textrm{Cu}$ isotope = 0.3083

Putting values in equation 1, we get:

$\text{Average atomic mass of Copper}=[(62.94\times 0.6917)+(64.93\times 0.3083)]\\\\\text{Average atomic mass of copper}=63.55amu$

Hence, the average atomic mass of copper is 63.55 amu.

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3 years ago

Which type of bond will form between these elements? *

BlackZzzverrR [31]

Answer:

Please mention elements so i can answer it

Explanation:

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3 years ago

How many grams of oxygen gas are produced when this sample is heated?

juin [17]

Answer: 2.92%

Explanation:

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4 years ago

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An automobile is driving uphill. Which form of energy is not involved in this process?

Lapatulllka [165]

The answer is D) Electromagnetic energy. This is not a type of energy that occurs when a vehicle is moving.

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4 years ago

Ionic equation: Zn(NO3)2 (aq)+ K2S (aq) ------> ZnS (s) + 2KNO3 (aq)

DochEvi [55]

Potassium nitrate does not have a net ionic equation. It is because potassium nitrate is not soluble and does not produce precipitates. The net ionic reaction is going to be Zn2+ + S2- -> ZnS(s). Zinc sulfide precipitates in the net ionic reaction.

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3 years ago

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