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3 years ago

Have you heard of the term barometric pressure? What does it mean?

1 answer:

7 0

Barometric pressure is just the same as atmospheric pressure. It is called barometric pressure because the instrument used to measure is called barometer. It is the pressure exerted by the air at a certain altitude. Since it is the pressure exerted by the air, it is also known as the weight of the air above the Earth. Depending on the altitude at which the measurement is done, barometric or atmospheric pressure varies, but the barometric pressure at sea level is 1 atm (atmosphere). It is equivalent to 101325 Pa (Pascal), 760 torr, 760 mm Hg and 1.01325 bar.

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Look at this data and calculate the mean, median, mode, and range.

CaHeK987 [17]

Answer:

the median is 14 the range is 15 the mode is 14 and the mean is 12.7

Explanation:

for the median you put all numbers is order but least to greatest and figure out the middle number for range you take the smallest and the biggest number and subtract them for mode you use the most repeated number and for the mean you add all the numbers and divide by the total of numbers I hope this helped

8 0

3 years ago

Observación cualitativa

arlik [135]

The answer:
La planta tiene las hojas secas.

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3 years ago

Consider the following reaction

andreyandreev [35.5K]

Answer:

Explanation:

CO2 + H2 → CO + H2O

↓ (-2). 0. (+2 )(-2). (+1)(-2)

↓ ·2 (+2)

+4 (-4)

Write down the oxidation number under each element, each molecule should equal 0 unless there is a charge shown.

Oxygen, always has an oxidation number of -2 unless in a peroxide.

Hydrogen, is -1 with metals,+1 with non-metals. Hydrogen loves non-metals!

H2 is zero because any standalone element has an oxidation number of zero

What is being oxidized? Whatever is being oxidized, loses electrons and becomes more positive, it will be a whole molecule, not just an element. In this case, the H in H2 goes from 0 to (+1) so it is the oxidized molecule.

8 0

4 years ago

SELECT ALL THAT APPLY

Luden [163]

The answer is 1 and 3. The number of atoms per molecule of these three substance is not equal. So they will not contain same number of atoms. And for gas, under same condition with same number of moles will have the same volume. The g.f.w is related to the atomic mass. So they are different.

8 0

4 years ago

Read 2 more answers

The concentration of sodium hydroxide is 1.0 M and the concentration of crystal violet is 1.00 x 10-5 M. Identify the limiting r

azamat

Some additional information is required to answer this question: the volumes of the solutions. So this answer assume 10.0 ml of each solution.

Answer:

Limiting reagent: crystal violet

How much excess reagent remains: 0.00099 mol of sodium hydroxide.

Explanation:

This question deals with the first part of a common experiment carried out in a lab, where a solution is preperared by mixing certain volume of crystal violet of known concentration with a volume of sodium hydroxide of known concentration, to obtain information about the kinetics of the reaction.

Both volumes must be known too.

To solve the answer you must know the volumes of each solution.

For explanation purposes, I will assume that the solution is prepared by mixing 10.0 mL of the 1.0× 10⁻⁵ M crystal violet with 10.0 mL of the 0.10 M sodium hydroxide.

Crystal violet is the organic compound with unit formula formula: C₂₅N₃H₃₀Cl.

1) Chemical equation:

Crystal violet is an ionic compound and the reaction with sodium hydroxied may be represented as folllows:

C₂₅N₃H₃₀Cl + NaOH → C₂₅N₃H₃₀OH + NaCl

2) Mole ratio:

1 mol C₂₅N₃H₃₀Cl : 1 mol NaOH : 1 mol C₂₅N₃H₃₀OH : 1 mol NaCl

So by each mol of crystal violet 1 mol of sodium hydroxide react.

3) Calculate the number of moles of each reactant:

Molarity: M = n / V (in liters) ⇒ n = M × V

Crystal violet: n = 10.0 ml × 1 liter / 1,000 ml × 1.00×10 ⁻⁵ M = 1.00×10⁻⁷ mol

Sodium hydroxide: 10.0 ml × 1 liter / 1,000 ml × 0.1 M = 1.00×10⁻³ mol

3) Limiting reactant:

Since, as per the theoretical mole ratio, 1.00×10⁻⁵ mol of crystal violet will react with the same number of moles of sodium hydroxide, the former is the limiting reactant.

4) Excess reagent:

The excess reagent is sodium chloride. The amount of excess reagent that remains after the reaction runs to completion is calculated by:

Remain reagent = Initial amount - amount that reacted

Since the mole ratio is 1 : 1, 1.00×10⁻⁵ mol of crystal violet react with 1.00×10⁻⁵ mol of sodium hydroxide, and the amount of sodium hydroxide that remains after the reaction runs to completion is:

1.00×10⁻³ mol - 1.00×10⁻⁵ mol = 0.00100 mol - 0.0000100 mol = 0.00099 mol (sodium hydroxide)

8 0

4 years ago