1,280 Cal into kilojoules

All methods of chromatography operate on the same basic principle that Select one: a. one component of the mixture will chemical

ANEK [815]

Answer:C

Explanation:

Chromatography separates compounds by taking advantage of their polarity. The stationary phase is generally very polar. The mobile phase can be pure hexane or various ratios of hexane with a polar eluent added. The more polar the compound, the more it interacts with the stationary phase and won’t move very far up the plate compared to the non-polar or less polar compounds that interact more with the non-polar hexane.

8 0

3 years ago

The density of a gas is 1.25 grams/liter. Which of the following is correct to convert the density of the gas to ounce/millilite

Sedaia [141]

Hi!

The correct option would be: Multiply 1.25 by 0.04 and divide the result obtained by 1,000

As we know 1g contains 0.04 oz, 1.25g will contain:

1.25 x 0.04

= 0.05 oz

We know 1L contains 1000mL, and as we are given only 1L, we can substitute the value of 1000mL in place of liter.

<h3>Another method is the conversion rule:</h3>

The rule for conversion is that when converting a larger unit to smaller unit, you multiply. As milliliter is the smaller unit, and liter is the larger unit, we multiply the denominator (which is 1) by 1000 to obtain 1000mL.

When converting a smaller unit to a larger unit, you need to divide. As grams is smaller than ounce, we divide the value of grams BUT with the number of grams in an ounce (28) not by the number of ounce in a gram (0.04).

Hope this helps!

6 0

4 years ago

Farmers who raise cotton once used arsenic acid, H₃AsO₄, as a defoliant at harvest time. Arsenic acid is a polyprotic acid with

Stels [109]

Explanation:

The reaction equation will be as follows.

$H_{3}AsO_{4} \rightleftharpoons H_{2}AsO^{-}_{4} + H^{+}$

Hence, the expression for $K_{a}$ is as follows.

$K_{a} = \frac{[H_{2}SO^{-}_{4}][H^{+}]}{[H_{3}AsO_{4}]}$

Let us assume that the concentration of both $[H_{2}AsO^{-}_{4}]$ and $[H^{+}]$ is x.

$2.5 \times 10^{-4} = \frac{x \times x}{0.5}$

x = 0.01118034

This means that the concentration of $[H^{+}]$ is 0.01118034.

Since, we know that the relation between pH and concentration of hydrogen ions is as follows.

pH = $-log [H^{+}]$

= $-log (0.01118034)$

= 1.958

Thus, we can conclude that the pH of a 0.500 M solution of arsenic acid is 1.958.

6 0

4 years ago

NEED 3 ANSWERS!!

Karo-lina-s [1.5K]

Real gas particles have more complex interactions than ideal gas particles.

Explanation:

Real gases do not behave exactly like ideal gases because real gas particles have more complex interactions than ideal gas particles.

At high pressures and low temperatures, a gas tends to deviate from ideality.

In an ideal gas molecules are not taking up space in the gas volume and intermolecular attractions are not pulling the particles closer to each other.
This condition is true when the gases are at low pressures and high temperature.
At a high pressure and low temperature, the gas deviates.
Under this condition, the gas becomes less energetic and intermolecular attraction becomes appreciable.

learn more:

Ideal gas brainly.com/question/9321544

#learnwithBrainly

6 0

3 years ago

The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is kc=2×1011 this means that the r

diamong [38]

At equilibrium it will consist of mostly products.

3 0

3 years ago