What must you determine first when solving a word rproblem?

2. Give an example of a chemical or physical process that illustrates the law of

Advocard [28]

The carbon atom in coal becomes carbon dioxide when it is burned. the carbon atom changes from a solid structure to a gas but it’s mass doesn’t change.

5 0

2 years ago

Read 2 more answers

Zn(CrO4)2 What is the name of the compound

insens350 [35]

Answer:

Zinc chromate

Explanation:

6 0

2 years ago

Consider the acid-catalyzed hydration of 3-methyl-1-butene. For each of the four steps, add one or two curved arrows to the reac

UkoKoshka [18]

Answer:

This addition follows MarkowniKov's rule

Explanation:

The image attached shows the mechanism of the reaction. It can easily be seen that a secondary carbocation is formed leading to the alkanol. The image simplifies the mechanism which involves the initial addition of the hydroxide followed by the hydrogen ion.

5 0

4 years ago

Ng a

konstantin123 [22]

Answer:

17 ppm

Explanation:

Paso 1: Información brindada

Masa de soluto: 0.025 g

Volumen de solución: 1.5 L

Paso 2: Convertir la masa de soluto a miligramos

Usaremos el factor de conversión 1 g = 10³ mg.

0.025 g × (10³ mg/1 g) = 25 mg

Paso 3: Calcular las partes por millon (ppm) del soluto

Usaremos la siguiente expresión.

ppm = mg de soluto / litros de solución

ppm = 25 mg / 1.5 L

ppm = 17 mg/L

6 0

4 years ago

What is Loschmidt’s number? How is it related to Avogadro’s number?

Rina8888 [55]

Answer:

The mole and Avogadro’s number are two important concepts of science that provide a link between the properties of individual atoms or molecules and the properties of bulk matter. It is clear that an early theorist of the idea of these two concepts was Avogadro. However, the research literature shows that there is a controversy about the subjects of when and by whom the mole concept was first introduced into science and when and by whom Avogadro’s number was first calculated. Based on this point, the following five matters are taken into consideration in this paper. First, in order to base the subject matter on a strong ground, the historical development of understanding the particulate nature of matter is presented. Second, in 1811, Amedeo Avogadro built the theoretical foundations of the mole concept and the number 6.022 × 1023 mol−1. Third, in 1865, Johann Josef Loschmidt first estimated the number of molecules in a cubic centimetre of a gas under normal conditions as 1.83 × 1018. Fourth, in 1881, August Horstmann first introduced the concept of gram-molecular weight in the sense of today’s mole concept into chemistry and, in 1900, Wilhelm Ostwald first used the term mole instead of the term ‘gram-molecular weight’. Lastly, in 1889, Károly Than first determined the gram-molecular volume of gases under normal conditions as 22,330 cm3. Accordingly, the first value for Avogadro’s number in science history should be 4.09 × 1022 molecules/gram-molecular weight, which is calculated by multiplying Loschmidt’s 1.83 × 1018 molecules/cm3 by Than’s 22,330 cm3/gram-molecular weight. Hence, Avogadro is the originator of the ideas of the mole and the number 6.022 × 1023 mol−1, Horstmann first introduced the mole concept into science/chemistry, and Loschmidt and Than are the scientists who first calculated Avogadro’s number. However, in the science research literature, it is widely expressed that the mole concept was first introduced into chemistry by Ostwald in 1900 and that Avogadro’s number was first calculated by Jean Baptiste Perrin in 1908. As a result, in this study, it is particularly emphasised that Horstmann first introduced the mole concept into science/chemistry and the first value of Avogadro’s number in the history of science was 4.09 × 1022 molecules/gram-molecular weight and Loschmidt and Than together first calculated this number.

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8 0

3 years ago