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inysia [295]
4 years ago
7

Consider the following statements about crystalline solids: 1) Molecules or atoms in molecular solids are held together via ioni

c bonds. 2) Metallic solids have atoms in the points of the crystal lattice. 3) Ionic solids have formula units in the point of the crystal lattice. 4) Molecules in covalent-network solids are connected via a network of covalent bonds. Which of the statements is true? A) 1. B) 2. C) 3. D) 4.E) None.
Chemistry
1 answer:
Ad libitum [116K]4 years ago
5 0

Answer:Molecules in covalent-network solids are connected via a network of covalent bonds.

Explanation:

A covalent network solid is a kind of solid consisting of the same type of molecules linked together by covalent bonds to form a three dimensional crystal lattice. Examples of a covalent crystal solid include; graphite and diamond. The entire lattice consists of covalent bonds. These molecules are closely packed in unit cells held together by vanderwaals forces.

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2. A block of aluminum with a mass of 140g is cooled from 98.4oC to 62.2oC with a release of 1137J of heat. From these data, cal
NeTakaya
Q =  M * C *ΔT

Q / <span>ΔT  = M

</span>Δf - Δi =  98.4ºC - 62.2ºC = 36.2ºC
<span>
C = 1137 J / 140 * 36.2

C = 1137 / 5068

C = 0.224 J/gºC</span>
8 0
3 years ago
Polymerization is the process of linking smaller molecules to form long chains of higher molecular weight. True or False
quester [9]
True is correct answer.


Polymerization is the process of linking it has a smaller molecules to form has a long chains of higher molecular weight.

Hope it helped you.

-Charlie
6 0
4 years ago
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At equilibrium the reactant and product concentrations are constant because a change in one direction is balanced by a change in
Anna [14]

Answer: a. The concentrations of the reactants and products have reached constant values

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.  For a chemical equilibrium reaction, equilibrium state is achieved when the rate of forward reaction becomes equal to rate of the backward reaction.

Equilibrium state is the state when reactants and products are present but the concentrations does not change with time and are constant.

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K_{eq}

K is the constant of a certain reaction when it is in equilibrium, while Q is the quotient of activities of products and reactants at any stage other than equilibrium of a reaction.

For a equilibrium reaction,

A\rightleftharpoons B

K_{eq}=\frac{[B]}{[A]}

Thus the correct answer is the concentrations of the reactants and products have reached constant values.

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3 years ago
2HgO(s)----&gt;2Hg(I)+O2(g) which type of reaction occurs
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Decomposition,because 1 breaks down into 2
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While does kerosene float on water​
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It will a because it has a lower density than water

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