All categories

2 years ago

What is biodiversity? I don't really understand...

Chemistry

1 answer:

Vesnalui [34]2 years ago

4 0

Answer:

it is also know as biological diversity

Explanation:

it refers to the varieties or various forms of plants and animals species

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If an ideal gas has a pressure of 5.49 atm, a temperature of 88.78 °c, and has a volume of 22.03 l, how many moles of gas are in

kirza4 [7]

N = (PV)/RT
(T = 88.78 + 273 = 361.78K)
(R = 22.4/273 = 0.082)
= (5.49 x 22.03)/(0.082 x 361.78) = ?
Put it into the calculator. It's hard to do that on a mobile phone.

7 0

3 years ago

What mass of sucrose needs to be dissolved in 540 g of water in order to prepare a 15% by mass solution.

Lilit [14]

Answer:

95.3g

Explanation:

Given parameters:

Mass of water = 540g

Percentage by mass of solution = 15%

Unknown:

Mass of sucrose = ?

Solution;

To solve this problem, we must understand that a solution is made up of solute dissolved in a solvent. A solute is the solid dissolved in another. The solvent is the is dissolving medium;

Percentage by mass of solute in solution = $\frac{Mass of solute}{Mass of solution} x 100$

Mass of solution = mass of water + Mass of sucrose = 540 + M

where M is the mass of sucrose;

therefore;

$\frac{M}{540 + M } x 100$ = 15

Solving for M gives 95.3g

Mass of sucrose is 95.3g

5 0

2 years ago

HBr + H₂SO₄ SO₂ + Br₂ + H₂O<br><br> whats the oxidizing agent and whats the reducing agent?

seropon [69]

Answer:

HBr + H₂SO₄ → SO₂ + Br₂ + H₂O An oxidizing agent is a substance that itself becomes reduced and oxidizes the other chemical species in the reaction mixture. A reducing agent is similar, except that it becomes oxidized and reduces the other substance. In the reaction, the valency of bromine changes from -1 to 0, so it is oxidized

Explanation:

3 0

3 years ago

Read 2 more answers

A vehicle travels at the same speed from point A to point B then from point B to point A

Ber [7]

Answer:

The speed is positive either direction.

Explanation:

It is given that, a vehicle travels at the same speed from point A to point B then from point B to point A.
We know that speed is a scalar quantity and velocity is a vector quantity.
Speed has only magnitude while velocity have both magnitude as well as direction.
In this case, the vehicle will have positive speed in either direction.
Hence, the correct option is (D)

7 0

3 years ago

A hot 123.3 g lump of an unknown substance initially at 164.2 °C is placed in 35.0 mL of water initially at 25.0 °C and the syst

Anuta_ua [19.1K]

Answer:

The unknown substance is rhodium.

Explanation:

Heat lost by hot substance will be equal to heat gained by the water

$-Q_1=Q_2$