CHEMISTRY HIGH SCHOOL

What are transferred in an oxidation-reduction reaction

Answers

Answer 1

Answer: hydrogen atoms or electrons

Answer 2

Answer:

Answer:

C. Electrons

Explanation:

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Phytoplankton are microscopic photosynthesizing organisms that typically live in the upper layers of the ocean. What trophic level do phytoplankton belong to?Primary producers
Decomposers
Primary consumers
Secondary producers

Answers

Answer: Primary producers

A food chain is a linear series of transfer of food and energy when one organism is consumed by the other organism in an ecosystem. The energy is distributed among different tropic levels of the food chains.

Phytoplankton is a class of unicellular simple, autotrophic organisms which are found in water of ocean, lakes and or any other freshwater body. These includes dinoflagellates, diatoms, cynobacteria, green algae and others. These organisms are abundantly present in the ecosystem in the lower most trophic level. They are called as primary producers because they are consumed by other organisms such as zooplanktons, fishes and large sea mammals.

i think they are primary producers, as they produce biomass from inorganic compounds (CO2)

What is the mass of 2.50 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?

Answers

Two things are given to us: The "molar mass" of NaOH and the number of molecules of NaOH.

The molar mass is different from "mass"; 1 mole of NaOH is equal to 40.0g/mol.
When the question asks, what is the mass? It is referring to how many grams there are.

First, we are going to convert the molecules to atoms using Avogadro's number (=6.02 x 10^23)

(2.50 x 10^22 molecules) x (6.02 x 10^23 atoms) = 0.042 mol

Next, we are going to convert from moles to grams.

0.042 mol of NaOH x 40.0 g of NaOH/1 mole = 1.68g of NaOH.

There are 1.68 grams in 2.50 x 10^22 molecules of NaOH.

Hello!

What is the mass of 2.50 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?

Data:

Molar Mass of NaOH = 40 g/mol

Solving: According to the Law Avogradro, we have in 1 mole of a substance, 6.02x10²³ atoms/mol or molecules

1 mol -------------------- 6.02*10²³ molecules

y mol -------------------- 2.50*10²² molecules

$(1)/(y) = (6.02*10^(23))/(0.250*10^(23))$

Product of extremes equals product of means

$6.02*10^(23)*y = 0.250*10^(23)*1$

$6.02*10^(23)\:y = 0.250*10^(23)$

$y = (0.250*10^(23))/(6.02*10^(23))$

$\boxed{y \approx 0.042\:mol}$

Solving: Find the mass value now

40 g ----------------- 1 mol of NaOH

x g ------------- 0.042 mol of NaOH

$x = 40*0.042$

$\boxed{\boxed{x = 1.68\:g}}\end{array}}\qquad\quad\checkmark$

Answer:

The mass is 1.68 grams

_______________________

I Hope this helps, greetings ... Dexteright02! =)

Which compound is soluble in water?(1) PbS (3) Na2S(2) BaS (4) Fe2S3

Answers

The compound Na2S or Sodium sulfide is soluble inwater. This compound is a water-soluble salt that give strong alkalinesolutions. When exposed to air or humidity this compound gives-off hydrogen sulfidethat smells almost the same as rotten eggs.

This chemical is commonly used in the pulp andpaper industry. Sodium sulfide compounds are usually used in chemicalphotography, textile bleaching, making dyes, and even detergents.

The other 3 compounds are non-soluble in water. Theircompositions are mostly metal in nature and require other process to transformthem into different compound forms.

Answer;

(3) Na2S

Explanation;

All sodium salts are soluble in water. Therefore, sodium sulfide will be soluble in water.
All sodium, potassium, and ammonium salts are soluble in water. The chlorides, bromides, and iodides of all metals except lead, silver, and mercury are also soluble in water.
The sulfides of all metals except barium, calcium, magnesium, sodium, potassium, and ammonium are insoluble in water.

Write M if the unit is that of a mass, V if the unit is that of a volume,and D if the unit is that of a density.

Answers

Answer:

6) V 7) M 8) V 9) D 10) D 11) M 12) D 13) V

Explanation:

Volume- cm^3, ml, etc.

Mass- g/cm^3, g/ml, etc.

Density- g, kg, etc.

Explain how a hawk or eagle could use convection currents to soar upward without flapping its wings

Answers

Hawks will usually fly in a particular area and circle it many times right?Therefore these birds gain their altitude by riding in the current air with other surrounding masses,thats why birds can go high up without using too much energy

The liquid substances mercury (density = 13.6 g/mL), water (1.00 g/mL), and cyclohexane (0.778 g/mL) do not form a solution when mixed; instead, they separate in distinct layers. List how the liquids would position themselves in a test tube. Rank the liquids from the top of the tube to the bottom.

Answers

Answer:

Cyclohexane, water, mercury.

Explanation:

One result of Archimedes' principle is that, in a container, the substance with the highest density will be in the bottom of the container and the substance with the lowest density, will be in the top of the container.

In the test tube with mercury, water and cyclohexane. In the top you will have cyclohexane (Least dense), in the middle will be the water and in the bottom will be mercury.

From the top to the bottom:

Cyclohexane, water, mercury.

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