If the energy content in the reactants is higher than the products, that means that the reaction must be giving away energy. So, in other words, chemical energy from the reactants must be released as heat.

6 0

3 years ago

The shininess of an element is also referred to as "metallic luster." which of the following elements is most likely to have a m

lisov135 [29]

<span>The shininess of an element is also referred to as "metallic luster." The element that is most likely to have a metallic luster is B. rhodium.
Arsenic has a dull luster, chlorine and hydrogen are gases so they don't have luster.
</span>

4 0

3 years ago

A particular sample of air is 2.5% water vapor express the concentration of water vapor in parts per million

Inessa05 [86]

Answer:

25000 ppm

Explanation:

<em>Parts Per Million </em>is defined as the number of parts of a solute per one million parts of a solution.

ppm = (Weight of Solute / Weight of Solution) × 10⁶ ---(1)

Let us suppose that the air (solution) weights 100 grams, then 2.5 % of water vapors will have following mass,

Mass of Vapors g / 100 g × 100 = 2.5

Or,

Mass of Vapors = 2.5 × 100 / 100

Mass of Vapors = 2.5 g

Hence, mass of water vapors is 2.5 g.

Now, putting mass of water vapors and air in eq. 1,

ppm = (2.5 / 100) × 10⁶

ppm = 25000

7 0

3 years ago