How many grams of KNO₃ should be used to prepare 2.00L of a .500 M solution ?

Answers

Answer 1

Answer: Volume = 2.00 L

Molarity = 0.500 M

M = n / V

0.500 = n / 2.00

n = 0.500 * 2.00

n = 1.0 mole KNO₃

Molar mass KNO₃ = 101.1032 g/mol

1 mole ------ 101.1032 g
1.0 mole ------ ?

mass = 1.0 * 101.1032 g / 1

mass = 101.1032 g of KNO₃

hope this helps!

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When electrons absorb energy they are able toa. move from exited states down to their ground states.
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When electrons absorb energy they are able to move from their ground states up to excited states. The answer is letter B. an example of this is when you light a match. The molecules of the matchstick are in its ground state. When you flick it on the ground or anything hard, it causes its molecules to move into the excited state and thus causing fire.

Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data? bar graph line graph histogram scatterplot

Answers

The best graph Rob can use to show his data is a scatter plot. A scatter plot shows a relationship between two sets of data in this case the solids and their respective solubility. A scatter plot is very specific in showing how one variable is affected by another variable.

Answer:

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Explanation:

hope it helps

Quartz, which contains one silicon atom and two oxygen atoms per formula unit, is the second-most-common mineral on Earth after feldspar. It is used as a gemstone, as well as in pressure gauges, oscillators, resonators, wave stabilizers, heat-ray lamps, and prismastic lenses, and in the manufacture of glass, paints, abrasives, and precision instruments such as watches. What is the chemical formula for quartz?

Answers

The chemical formula for quartz is SiO_2

The chemical formula for quartz is SiO_2, which represents one silicon atom and two oxygen atoms in each formula unit.

Quartz is composed of silicon (Si) and oxygen (O) atoms bonded together in a specific arrangement. Its chemical formula, SiO2, represents this composition.

In quartz, each silicon atom is bonded to two oxygen atoms, and each oxygen atom is bonded to one silicon atom. This arrangement forms a three-dimensional network structure, making quartz a crystalline mineral.

The chemical formula SiO_2 provides a precise representation of the elements and their ratios in quartz.

Silicon and oxygen are the two elements that make up the mineral, and they are combined in a 1:2 ratio, meaning that for every silicon atom, there are two oxygen atoms.

This ratio is essential for understanding the stoichiometry and structure of quartz.

Quartz has various applications due to its unique properties, such as its hardness, transparency, and ability to transmit certain wavelengths of light, making it valuable in electronics, optics, and various industrial processes.

Learn more about Chemical formula for quartz here:

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The valence of aluminum is +3, and the valence of chlorine is –1. The formula for aluminum chloride iscorrectly written as
A. ClAl3.
B. Cl3Al.
C. AlCl3.
D. Al3Cl.

Answers

The correct option is C.i.e. AlCl3Given:The valence of aluminum is +3, and the valence of chlorine is –1. Thus, 3 chlorine atoms each of (-1 charge )combine to make the charge balance because of Al (3+). Thus, 1 atom of Aluminum (Al) binds with three atoms of Chlorine (Cl).Thus, the net foromula becomes AlCl3

AICI3

which is choice c.

Aluminium chloride

Chemical compound

DescriptionAluminium chloride is the main compound of aluminium and chlorine. It is white, but samples are often contaminated with iron(III) chloride, giving it a yellow color. The solid has a low melting and boiling point. Wikipedia

IUPAC ID: aluminium chloride

Molar mass: 133.34 g/mol

Soluble in: Water

Related Lewis acids: Iron(III) chloride; Boron trifluoride

Heat capacity (C): 91.1 J/mol·K

Other names: aluminium(III) chloride; aluminum trichloride

What is the noble gas configuration for silicon?

Answers

[Ne]3s23p2
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Why do natural systems like the water in a pond rarely reach thermal equilibrium?

Answers

Final answer:

Natural systems like water in a pond rarely reach thermal equilibrium due to temperature differences and energy transfer limitations.

Explanation:

Natural systems like the water in a pond rarely reach thermal equilibrium due to various factors.

One reason is the presence of temperature differences in different parts of the pond. For example, during the summer, the upper layer of water is warmed by the Sun and doesn't mix with deeper, cooler water, causing thermal stratification.
Another reason is that energy transfer by heat requires a temperature difference. Once the two masses of water in the pond are mixed, there is no more temperature difference left to drive energy transfer by heat and do work.

These factors prevent the pond from reaching thermal equilibrium.

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