3 years ago

A working model used to test a design is called a

Chemistry

1 answer:

Lisa [10]3 years ago

5 0

Answer:

A working model used to test a design is called a

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1. What is an indicator and how does it work?

Goryan [66]

Answer:

Chemical indicator, any substance that gives a visible sign, usually by a color change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow color to an alkaline solution.

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2 years ago

In a chemical equation, which symbol should be used to indicate that a substance is in solution?

lisov135 [29]

Example :

$2FeCl_3_{(aq)}+2KI_{(aq)}=2FeCl2_{(aq)}+2KCl_{(aq)}+I_2_{(s)}$

If you use the subscript (aq) (=aquaris) , this means that the substance is in a solution.

Subscripts:
-aq-this means that the substance is in a solution
-s-this means that the substance is a solid(or precipitate)
-l-this means that the substance is a liquid
-g-this means that the subtance is a gas

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3 years ago

Read 2 more answers

Calculate the number of molecules in 7 moles of oxygen

Alexxandr [17]

Answer:

4.21

Explanation:

use Avogadro's number

6.023 x 10^23

multiply this by 7 because you want to find 7 moles :

6.023 x 10^23 x 7 = 4.21

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3 years ago

Number the steps for balancing equations:

Natali5045456 [20]

Answer:

identify the atoms on each side

count the atoms on its side

use coefficients to increase the atoms on each side

check to make sure you have the same number of each type of atom on each side

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2 years ago

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What is the difference between a stable and unstable isotope

USPshnik [31]

Stable isotopes are not radioactive nor dangerous.

Unstable isostopes are radioactive and have different mass of the element.

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3 years ago