What element is found in fish

Answers

Answer 1

Answer: The elements found in fish are Mercury, Cadmium, Lead, Tin and Arsenic
Your answer is Mercury, Cadmium, Lead, Tin and Arsenic

Answer 2

Answer: Well toxic elements found in fish are Mercury, cadmium, lead, tin, and arsenic.

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Help ! how do I do this

What is the % yield if 20 grams of hydrogen is reacted with 32 gramsof oxygen and produces 9 grams of water?
H2 + O2 -> H2O

Answers

If 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.

What is Percent yield?

Percent yield is the ratio of the actual yield times the theoretical yield to 100. When the actual and theoretical yield are equal, the percentage yield is 100%. So if the actual yield is less than the theoretical yield then the percentage yield is less than 100%. This situation may arise due to the incompleteness of the reaction or the loss of the sample during the recovery process.

According to the stoichiometry of reaction of formation of water,

4 g hydrogen gives 36 g water, thus, 20 g hydrogen gives 20×36/4=180 g water which is theoretical yield.

So, the percent yield=observed yield/theoretical yield×100

percent yield=9/180×100=5%.

Thus, if 20 g of hydrogen is reacted with 32 g of oxygen to produce 9 g of water, the percentage yield is 5%.

Learn more about Percent yield, here:

brainly.com/question/22178760

#SPJ2

Answer:

12.5%

Explanation:

32/16 = 2 moles of oxygen

2 x 18.01 x 2/1 = 72.04 g of H2O

9/72.04 x 100 = 12.5%

balanced equation: 2H2 + O2 → 2H2O

limiting reactant is oxygen

How doesthe pressure inside a rigid container change if the
absolute temperature of the gas inside is quadrupled?

Answers

Answer:It quadruples

Explanation:

Greenhouse gases help regulate earths. A) oceans B) acid rain C) atmosphere D) temperature

Answers

greenhouse gases help regulate earth by D. temperature

Greenhouse gases help regulate earths D. Temperature.

How many molecules (not moles) of nh3 are produced from 6.62×10−4 g of h2?

Answers

N₂(g) + 3 H₂(g) = 2 NH₃(g) molar mass N₂ = 28.0 g/mol
NH₃ = 17.0 g/mol

14 g N₂ ---------------> 2 x 17 g NH₃
6.62 x 10⁻⁴ g --------> ?

Mass NH₃ = ( 6.62 x 10⁻⁴ ) x 2 x 17 / 14

Mass NH₃ = 0.022508 / 14

Mass NH₃ = 0.00160 g

number of moles = 0.00160 / 17 = 9.41 x 10⁻⁵ moles

1 mole ----------------------- 6.02 x 10²³ molecules
9.41 x 10⁻⁵ moles ---------- ?

molecules NH₃ = ( 9.41 x 10⁻⁵ ) x ( 6.02 x 10²³ ) / 1

= 5.66 x 10¹⁹ molecules of NH₃

hope this helps!

An experiment using alpha particles to bombard a thin sheet of gold foil indicated that most of the volume of the atoms in the foil is taken up by ...

Answers

Empty space. We now know that this is the gap between the electrons and nucleus.

The experiment that used alpha particles to bombard a thin sheet of gold foil indicated that most of the volume of the atoms in the foil is taken up by $\boxed{{\text{empty space}}}$

Further Explanation:

Rutherford’s experiment:

Rutherford's model of atom is the classic model of the atom instead of having many limitations. He designed an experiment that used alpha particles emitted by radioactive elements as objects that can demonstrate the structure of the atom. Rutherford showed his own physical model for the subatomic structure as a result of the experimental observations.

The postulates of Rutherford’s model are as follows:

1. An atom consists of a positive charge in a very small volume. Most of its mass is concentrated in a very small region of the atom and this region was termed as the nucleus of the atom.

2. The nucleus of the atom is surrounded by the negatively charged particles which were called electron. These electrons were supposed to revolve around the atomic nucleus in a circular path at a very high speed. This circular path is called orbit.

3. A very strong electrostatic force of attraction holds together the negatively charged electrons revolving around the nucleus positively charged concentrated in the nucleus.

Limitations of Rutherford’s model:

1. It did not tell anything about the distribution of electrons in various orbits.

2. This model failed to explain Maxwell’s theory of electromagnetic radiation.

3. It was unable to explain the stability of an atom.

Therefore most of the volume of an atom is taken up by empty space in the atom.

Learn more:

1. The major contribution of Antoine Lavoisier to chemistry: brainly.com/question/2500879

2. Example of physical change: brainly.com/question/1119909

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Atomic Structure

Keywords: Rutherford, atom, volume, nucleus, orbit, postulates, limitations, Maxwell, electromagnetic radiations, distribution of electrons, stability of atom.

Calcium chloride contains only calcium and chloride. What is the formula for this compound

Answers

Calcium give the cation $Ca^(2+)$ , chloride gives the anion $Cl^-$ . The compound is electrically neutral, and is hence $\boxed{CaCl_2}$

Answer:

B.) CaCl2

Explanation:

CaCl2 Calcium has a positive 2 charge and chlorine has a negative 1 charge. It takes 2 chlorine atoms for every calcium in order to be neutral.

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The temperature at which a liquid becomes a solid is the: a. boiling point b. density c. freezing point d. solubility

Where is the atmosphere the most dense?