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3 years ago

Write a balanced equation for: (a) alpha decay of gold-173

1 answer:

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<span>The element gold has 32 isotopes, ranging from A =173 to A = 204. during alpha decay Au will loose 2 in atomic number and 4 in mass number . it will form a iridium isotope and helium . according to the above statement, the balanced equation for the alpha decay of gold 173 will be given as below. 173 169 4 79 Au-------------->77 Ir + 2He</span>

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Which of the following is an exothermic reaction?

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Chemical reactions can be broadly classified into two categories from the context of heat requirement. These include; endothermic and exothermic reactions.

Endothermic reactions proceed with the absorption of heat while exothermic reactions are accompanied by the evolution of heat.

1) Oxidation of iron involves reaction of elemental iron with oxygen to form iron oxide (rust). This is essentially a corrosion reaction in which the metallic bonds in Fe are broken and new bonds between Fe and O are formed, This is an exothermic reaction

4Fe + 3O2 → 2Fe2O3

Ans D)

2) The process of condensation i.e. phase change liquid to solid (or gas to liquid) involves release of heat to the surroundings, hence it will be an exothermic reaction.

Ans B)

3) Specific heat is the amount of heat required to raise the temperature of 1 g of a substance by a 1 C. Typically, liquids and gases are used as coolants. For a coolant to be efficient, it must have a high specific heat.

Ans B)

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3 years ago

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A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution

Nataly [62]

Answer:

Fewer bubbles will be produced because of fewer collisions of reactant molecules

Explanation:

As the solid dissolves into the solution after the liquid has been vigorously bubbled, if the temperature of the liquid is reduced a little, what will happen is that fewer bubbles will be produced as a result of lesser amount of collisions occurring between the reactant molecules

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3 years ago

Which of these is an example of pseudoscience?

Nesterboy [21]

Astrology............

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3 years ago

PLEASE HELP!! Phytoplankton are one of the most important parts of the food web in the Hudson river. what evidence supports the

Sedaia [141]

Answer:

Your answer is b

Explanation:

the answer is b because if there is no phytoplankton then there will be no fish and if you take out one part of the food chain then the whole chain comes apart. So meaning if there is no phytoplankton, then there is no fish, if there isn't any fish, then the other animals that come to eat at the river will eventually starve to death or move somewhere else to get more food.

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3 years ago

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Is 1-bromo-2,3-dimethylbutane chiral? If chiral, give the number(s) of the chirality center(s) (increasing numberical order, sep

Wewaii [24]

Answer:

1-bromo-2,3-dimethylbutane is chiral. There is one chiral center at carbon number 2.

4,5-dimethyl-2,6-octadiyne is chiral. There are two chiral centers: one at carbon number 4 and the other at carbon number 5.

Explanation:

Start by sketching the structure of the two compounds. (A colored sketch of the two compounds is attached.) The first compound is a branched halogen-alkane with four carbon atoms in its backbone. The second is a branched alkyne with two triple bonds.

Each carbon atom contains four valence electrons. It forms four chemical bonds. A carbon atom is chiral if each of its four bonds connects to a different group of atoms.

For example, the second carbon atom (number two) in 1-bromo-2,3-dimethylbutane is connected to:

one $\rm \text{-CH}_2\text{Br}$ ,
one $\text{-CH}_3$ ,
one $\text{-H}$ , and
one $\text{-CH}(\text{CH}_3)_2$ .

All four of these groups are different. As a result, this carbon atom is chiral.

Another example: the third carbon atom in 1-bromo-2,3-dimethylbutane is connected to

one $\text{-H}$ ,
two $\text{-CH}_3$ , and
one $\text{-CH}(\text{CH}_3)(\text{CH}_2\text{Br})$ .

This carbon atom is connected to two instances of the same group $\text{-CH}_3$ . As a result, it is not chiral.

One more example: the first carbon atom in in 1-bromo-2,3-dimethylbutane is connected to:

two $\text{-H}$ ,
one $\text{-Br}$ , and
one $\text{-CH}(\text{CH}_3)(\text{CH}(\text{CH}_3)_2)$ .

This carbon atom is connected to two of the same group. As a result, it is not chiral. This example shows that it is likely helpful for the sketch to include all the hydrogen atoms in this compound.

Carbon atoms 2, 3, 6, and 7 in 4,5-dimethyl-2,6-octadiyne are all connected to triple bonds. None of these atoms is bonded to four groups. Therefore, they cannot be chiral. In other words, out of the eight carbon atoms in this compound, only four of them need to be checked for chirality.

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3 years ago