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3 years ago

Give the four symbols for physical states of reactants and products, and tell what each means.

1 answer:

6 0

We are going to use table salt, NaCl as an example.

(s) = solid, eg the salt you put on your food is a crystalline solid.
(l) = liquid, if you melt salt it take on a liquid form
(g) = gaseous, if you put enough energy in the salt will turn into a gas.
(aq) = aqueous, meaning in water or another solvent. If you put some table salt in water and stir it, it will dissolve, the NaCl molecules dont get destroyed but they dissolve becoming part of the liquid.

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What organisims allowed for the build up of oxygen in the atmosphere?

Maru [420]

Answer:

The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.

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3 years ago

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The Dome of the Rock and Al-Aqsa Mosque are located in what city?

Nataly_w [17]

They are located in Jerusalem.

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A bag of fertilizer is labeled 10-20-20. What is the actual percentage of phosphorus in the fertilizer?

aleksandr82 [10.1K]

Answer:

20% of phosphorus

Explanation:

A fertilizer is used to improve the fertility of soils. Most fertilizers contains the element nitrogen, phosphorus and potassium.

They are often designated NPK fertilizers.

Now we know that the numbers 10-20-20 depicts the nitrogen-phosphorus and potassium content of the fertilizer.

From the designation,

The actual percentage is 20% of phosphorus.

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20% of potassium

8 0

3 years ago

Why is an alloy is often more useful than a pure metal

mrs_skeptik [129]

<h2>Answer:</h2>

A pure metal has specific properties. Sometimes we need that metal but with modified properties. So for the modification of properties we make alloys.

<h3>Explanation;</h3>

An alloy is a mixture of two elements, one of which is a metal.
Alloys often have properties that are different to the metals they contain.
This makes them more useful than the pure metals alone.
For example, alloys are often harder than the metal they contain.

4 0

3 years ago

When taking a measurement with a pH meter, keep the instrument in the ______________ until it is needed. Rinse the pH meter with

nydimaria [60]

Answer:

Storage solution; deionized water; stabilizes.

Explanation:

The pH scale measures the concentration of hydrogen ions in acidic and alkaline solutions.

In chemistry, it literally means power of hydrogen ions and it is a measure of the molar concentration of hydrogen ions in a particular solution, thus specifying the acidity, neutrality or basicity of chemical solutions.

Mathematically, the pH of a solution is given by;

$pH = -log_{10}(H^{+})$

Hence, a solution with a pH of 7 is neutral. Also, a solution with a pH below 7 is acidic but basic (alkaline) if it's pH is above 7.

A pH meter can be defined as a scientific instrument or device designed and developed for the measurement of the hydrogen-ion concentration in water-based solutions, in order to determine their level of acidity or alkanility.

When using a pH meter to take a measurement, you should keep it in a storage solution until it is needed. Also, a deionized water should be used to rinse the pH meter and gently pat dry.

Furthermore, the pH meter should be placed in a given sample solution and a reading of the measurement taken when the pH of the solution stabilizes.

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3 years ago