CHEMISTRY HIGH SCHOOL

Considering the law of conservation of mass, if 56 g samples of solid iron (Fe) reacts with 24 g of oxygen (O2), how many grams of Iron Oxide (FeO) are obtained?

Answers

Answer 1

Answer:

62_grams of FeO

Explanation:

Molar mass of Fe = 55.845_g/mol

Molar mass of O2 = 15.999_g/mol

From law of conservation of mass

2 moles of Fe combines with one mole of O2 to form 2 moles of FeO

Number of moles of Fe and O2 present = mass/(molar mass) = 56/55.845~1

and 24/16 = 1.1.5

Therefore

1 part of Fe will react with 0.5 part of one mole of O2

which is 54_g of Fe reacts with 8_g to form 54+8 = 62_grams of FeO

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How many Atoms are in 2.3 g of Na? show your work and these question will take two steps

Answers

Use stoichiometry and convert 2.3 grams of sodium to moles. Then convert the moles to atoms using 6.02(10)^23.

Post your answer and I'll post mine :)

Which statement about the self-ionization of water is correct? a. Two water molecules interact to form a water molecule and a hydroxide ion. b. Two water molecules interact to form a hydronium ion and a hydroxide ion. c. Two water molecules interact to form two hydronium ions. d. Two water molecules interact to form two hydroxide ions.

Answers

Answer: The correct answer is Option b.

Explanation:

Water is the compound which is formed by the covalent bonding of hydrogen and oxygen atoms. The chemical formula for this compound is $H_2O$

Self-ionization of water is defined as the process in which 2 water molecules react together to produce hydroxide ion and hydronium ion.

The equation for the self ionization of water molecule follows:

$2H_2O(l)\rightarrow H_3O^+(aq.)+OH^-(aq,)$

By Stoichiometry of the reaction:

2 moles of water molecules react together to produce 1 mole of hydronium ion and 1 mole of hydroxide ion.

Hence, the correct answer is Option b.

b. Two watermolecules interact to form a hydronium ion and a hydroxide ion. This is basically the definition of the process.

Identify the chiral carbon in amphetamine (benzedrine)

Answers

Chiral Carbon is a carbon atom that is attached to 4 different types of atoms or group of atoms

In Amphetamine, there is only 1 carbon that have 4 different types of atoms, so there is only 1 Chiral Carbon in it which have 2 optical isomers :

PhCH2CH(NH2)CH3

What weighs more? 1 mol of Gold, or 1 mol of Lead. A. You cannot determine the answer to this question from this information alone B. They both weigh the exact same amount C. 1 mol of Gold D. 1 mol of Lead

Answers

b, they both weigh the exact same. they’re both 1 mol

Final answer:

1 mol of Lead weighs more than 1 mol of Gold because lead has a higher atomic mass (207.2 g/mol) compared to gold's atomic mass (197.0 g/mol). Option D. is correct.

Explanation:

Consider the atomic masses of both gold and lead, as the question involves comparing a mole of each. Importantly, the molar mass of any substance is numerically equivalent to its atomic weight in Atomic Mass Units (amu). The atomic mass of gold is approximately 197.0 amu while lead has an atomic mass of around 207.2 amu.

Therefore, a 1 mol of Lead (207.2 g) would weigh more than 1 mol of Gold (197.0 g).

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What happend if NH3+ HJ

Answers

Are you sure you copied that down correctly? I know what NH3 is but HJ I am comming up blank on. The only thing HJ I know is hebdojoule which is unit system.
Are you doing chemical balancing?

The secondary structure of a protein refers to the ___________.a. three-dimensional folded structure of the protein. b. configuration of the folded protein when bound to other proteins. c. linear assembly of amino acids into a chain. d. twisting of the amino acid chain into a corkscrew-like shape or into a zigzag folding pattern. e. None of the above answer choices is correct.

Answers

Answer:

(A.) three dimensional folded structure of the protein

Explanation:

The secondary structure of a protein is a regular structure built from interactions between neighboring amino acids as the polypeptide starts to fold or coil into its functional three-dimensional shape.

The two kinds of secondary structures arising from this polypeptide 'flexing' are either the α-helix and β-pleated structures, all of which are vital to globular and fibrous proteins.

Final answer:

The secondary structure of a protein is the initial folding of the amino acid chain into a corkscrew-like shape (alpha helix) or a zigzag folding pattern (beta-pleated sheet). This occurs due to hydrogen bonding between the peptide bonds.

Explanation:

The secondary structure of a protein refers to the sense in which the polypeptide chain (the linear assembly of amino acids) begins to fold. This folding occurs due to the formation of hydrogen bonds between the peptide bonds in the chain. The two most common types of secondary structures are alpha helix (corkscrew-like shape) and beta-pleated sheet (zigzag folding pattern). Therefore, the correct answer to your question is option d: the twisting of the amino acid chain into a corkscrew-like shape or into a zigzag folding pattern.

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