CHEMISTRY HIGH SCHOOL

Which of these is a chemical property of iron? A.
It is dense.
B.
It has a melting point.
C.
It is hard to bend.
D.
It becomes rusted.

Answers

Answer 1
Answer: Iron becomes rusted especially in damp air but never in a dry air,  this is one of the many unique characteristics of iron. Iron is also ductile and malleable. It is found in the seventh group of the periodic table. It has four different and unique crystalline forms and completely dissolves in dilute acids. The two chemical compounds that can be found or made from iron are the bivalent iron also known as ferrous and the trivalent iron or known as ferric compounds.
Answer 2
Answer:

the answer is d.it becomes rusted

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Determine the mass of 2.5 cups of water if the density of water is 1.00 g/cm^3 and 1 cup = 240 mL

Answers

1) we find out the volume of the water.
Remember: 1 ml=1 cm³
Volume of the water=number of cups x volume of one cup.
Volume of the water=2.5(240 ml)=600 ml=600 cm³

Density=mass/volume    ⇒ mass=density x volume

2) we calculate the water mass of 600 cm³ of water.
mass=density x volume
mass=(1 g/cm³)(600 cm³)=600 g.

Answer: the mass of 2.5 cupas of water is 600 g.

In a laboratory investigation, magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. This reaction is represented by the unbalanced equation below.Mg(s) + HCl(aq) ==>H2(g) + MgCl2(aq)

State, in terms of the relative activity of elements, why this reaction is spontaneous.

Answers

The reaction depicted by the equation would be spontaneous because Mg is higher in reactivity than H.

Reactivity series of cations

The reactivity series of anions is such that: K, Na, Ca, Mg, Al, Zn, Fe, Sn, Pb, and H.

Ions at the higherposition in the reactivity series are able to displace those in lower positions in chemical reactions. Whereas, those in lower positions cannot displace those in higher positions.

Mg is far higher than H in the reactivity series, and thus, will be able to displace Hfrom HCl without any forceful procedure.

More on the reactivity series can be found here:brainly.com/question/14652325

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Where are the protons and neutrons and electrons located in an atom?

Answers

The protons and neutrons are located in the nucleus of an atom, while the electrons are located in the orbital cloud. 

Final answer:

Protons and neutrons are found in the nucleus of an atom while electrons are found in orbitals surrounding the nucleus. The number of protons determines the type of element the atom is.

Explanation:

In an atom, protons and neutrons are located in the nucleus, which is the central part of the atom. The electrons on the other hand, are situated in the areas around the nucleus called electron shells or orbits. Protons carry a positive charge, neutrons are neutral, and electrons carry a negative charge. The number of protons in an atom is what determines the atomic number and thus, the type of element it is.

Learn more about Atom structure here:

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Which of these compounds has chemical properties most similar to the chemical properties of ethanoic acid?(1) C3H7COOH (3) C2H5COOC2H5(2) C2H5OH (4) C2H5OC2H5

Answers

The correct answer is : (1) C3H7COOH.

Ethanoic acid has the molecular formula CH3COOH. It belongs to the homologous series of alkanoic acid or carboxylic acid. Homologous series are series of organic compounds in which a member differs from the next member by –CH2. One of the major characteristics of the homologues is their similarity in chemical properties. Propanoic acid (C3H7COOH) is the only member of the alkanoic acid family among the options given. So, it is the only one that has similar chemical properties with ethanoic acid.The other options are wrong because:

(2) C2H5OH belongs to the alcohol family.

(3) C2H5COOC2H5 belongs to the alkanoates family (esters)

(4) C2H5OC2H5 belongs to the ether family.
You need to first consider the properties of ethanoic acid that are worth noting. Ethanoic acid is a weak acid (the carboxyl group has a resonance-stabilized base), and the length of its carbon chain (2 carbons) reflects the strength of its Van der Waals forces. Also, the hydroxyl group (as part of the carboxyl group) confers a large dipole moment to the compound. The most similar compound would be the one that resembles ethanoic acid in these respects.Thus, I would say that the answer is (2) C2H5OH. Because oxygen is highly electronegative, it can retain an extra electron without much difficulty, making the hydroxyl group slightly acidic. The hydroxyl group also confers a large dipole moment, and the 2 carbon backbone indicates similar Van der Waals interactions.

The basic points in Lewis and Langmuir theory of electrovalency

Answers

The correct answer for the question that is being presented above is this one: "Electrovalency is characterized with the transferring of one or more electrons from one atom to another together with the formation of ions and as well as the number of positive and negative charges. 

The Lewis and Langmuir theory of electrovalency (and as well as Kossel's) is dealing with Ionic bonds. 

Lewis: electron-pair sharing, octet rule, Lewis Symbols or StructureLangmuir: introduced term "covalent" bond, and popularized Lewis's ideas

The Lewis-Langmuir electron-pair or covalent bond is referred as the homopolar bond, where the complete transfer of electrons give rise to ionic, or electrovalent bond (1) through attraction of opposite charges.

The following reaction does not proceed to form a product: H2O + Au---> no reaction. Why is that?. . A. Gold has a higher activity than hydrogen and cannot replace it.. . B. Gold has a lower activity than hydrogen and cannot replace it.. . C. The reaction cannot occur because water is a reactant.. . D. The reaction proceeds too slowly to create products..

Answers

I think the correct answer from the choices listed above is option B. The following reaction does not proceed to form a product: H2O + Au---> no reaction because gold has a lower activity than hydrogen and cannot replace it. Hope this answers the question.
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