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Rina8888 [55]
3 years ago
5

¿soy guapo? si dices que si te doy una galletita

Chemistry
2 answers:
tankabanditka [31]3 years ago
8 0

Answer:

Hindi ko po ma gets sinasabi nyu pwedeng pakiayus

bezimeni [28]3 years ago
3 0
Chrehtegv ittgger ok so eva
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Describe how chemical substances are used based on their physical properties?
Lilit [14]
The answer is
Physical properties: Properties that do not change the chemical nature of matter
Chemical properties: Properties that do change tha chemical nature of matter

Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density. There are many more examples. Note that measuring each of these properties will not alter the basic nature of the substance.

Examples of chemical properties are: heat of combustion, reactivity with water, PH, and electromotive force.
3 0
3 years ago
Everything in group 2 on the periodic table are called
Ludmilka [50]

Answer:

group two elements are called alkaline earth metals

Explanation:

Because their oxides form in the earth and are water soluble

3 0
3 years ago
How do I calculate the molecular and molar masses of compounds​
ludmilkaskok [199]

Answer:

The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol). The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.

6 0
3 years ago
Given that the formula for mass percent is mass % = mass solutemass solution100%, what will be our starting assumption when conv
attashe74 [19]

Answer:

    1. The starting assumption is an amount of 100 grams of solution.

    2. It simplifies the problem, because the percentage tells directly the mass of solute present in 100 grams of solution and from that point the calculations are easy to do.

Explanation:

<em>Percentages are always based on the amount of total substance</em>, total solution if it is the case.

If it is mass percentage the amount of total substance is mass.

For instance, a 30% mass solution of sodium chloride means 30 grams of sodium chloride (solute) in 100 grams of solution (includes the solvent plus the solute).

  • mass percent is mass % = (mass solute / mass solution) × 100%,

<em>Molarity</em> is number of moles of solute per volume in liters of solution:

  • Molarity = (moles solute / liters solution)

In this case,<em> to convert from percentage to molarity</em> you start assuming a base of 100 grams of solution. For the example of the 30% sodium chloride solution, by assuming 100 grams of solution, you had 30 grams of solute, which you can convert into moles, and, by using the density of the solution (which you need to know), you convert the 100 grams of solution into volume (in liters). Then, you can divide the number of moles of solute into the number of liters of solution, having started with the assumption of 100 grams of solution.

<em>Molality</em> is the number of moles of solute per kilograms of solvent.

  • Molality = moles solute / kg of solvent.

Again, <em>to convert from percentage to molality</em>, your first step is to assume a base of 100 grams of solution. Then, for the same example of 30% sodium chloride, convert 30 grams of solute to moles, and the 100 grams of solution into 70 grams of solvent (100g solution - 30 grams solute = 70 grams solvent), which is 0.070 kg. Finally, divide the moles of solute by 0.070 kg of solvent.

Then, assuming the amount of solution equal to 100 grams simplifies the problem because the percentage tells directly the amount of solute, which you can convert into moles making calculations easier than with other amount of solution.

5 0
3 years ago
What is corrission?plzzz say me the answer fast
trapecia [35]
The process of formation of a reddish brown layer on an iron metal due to contact with air and water is known as corrosion.
3 0
3 years ago
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