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3 years ago

HELP please, 50 points 5 minutes timed

Chemistry

1 answer:

shusha [124]3 years ago

3 0

Answer:

Coordinate geometry is one of the most important and exciting ideas of mathematics. In particular it is central to the mathematics students meet at school. It provides a connection between algebra and geometry through graphs of lines and curves. This enables geometric problems to be solved algebraically and provides geometric insights into algebra.

The invention of calculus was an extremely important development in mathematics that enabled mathematicians and physicists to model the real world in ways that was previously impossible. It brought together nearly all of algebra and geometry using the coordinate plane. The invention of calculus depended on the development of coordinate geometry.

Explanation:

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How many milliliters of a stock solution of 2.00M KNO3 would you need to prepare 150mL of a 0.3M solution?

ser-zykov [4K]

Answer:

The answer is "22.5"

Explanation:

Concentration:

$M_1= 0.3 \ m \ of\ KNO_3\\\\M_2=2.00\ M\\\\$

Volume:

$V_1=150 \ ml \ of\ KNO_3 \\\\V_2=?$

Using formula:

$M_1V_2=M_2V_2\\\\V_2=\frac{M_1V_1}{M_2}\\\\$

$=\frac{0.3 \times 150}{2}\\\\=\frac{45}{2}\\\\=22.5$

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3 years ago

Elements in the same group have _____.

tresset_1 [31]

Answer:

Element in the same group have similar chemical properties.

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3 years ago

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What is unique about the way that transition metals form compounds?

Alika [10]

Answer:

<u><em>A. They don't form compounds</em></u>

Explanation:

High density: The strong bonding between the atoms in transition metals cause them to be tightly held together, creating a high density. Colored compounds: Transition metals tend to form more colored compounds than other elements, either in solid form or dissolved in a solvent.

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3 years ago

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What happens to the ancient calendar during the winter and summer solstices

iris [78.8K]

During the winter solstices, we experience the longest day and the shortest night while during the summer solstices the sun is at its highest point in the sky.

<h3>What is the Solsticest?</h3>

The Solstices is the season that occurs at the moment the earth's tilt toward or from the sun is at a maximum. There are two seasons of Solstices which include the following:

The winter solstices: This occurs when the sun is directly over the Tropic of Capricorn causing us to have the shortest day and longest night of the year.

The summer solstices: The sun is at its highest elevations.

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2 years ago

3 Cu + 8HNO3 g 3 Cu(NO3)2 + 2 NO + 4 H2O

liubo4ka [24]

24.25 moles of NO can be produced using 97 moles of HNO3.

<h3>What is balanced chemical equation?</h3>

Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations. Varied elements' atom counts in the reactants and products of unbalanced chemical equations are different.

3 Cu + 8HNO3 g → 3 Cu(NO3)2 + 2 NO + 4 H2O

The number of moles consumed can be calculated using comparing with coefficients in the balanced reaction .

So , from above eq we get that 8 moles of HNO3 are consumed to make 2 moles of NO.

⇒ 8 HNO3⇔2 NO

⇒ 1 HNO3⇔ 1/4 NO

This means that for each mole of HNO3 produces 1/4 moles of NO.

So , for 97 moles of HNO3 , $\frac{1}{4} *97$ moles of NO can be made,

So, total moles of NO made are 24.25 moles.

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2 years ago

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