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Papessa [141]
3 years ago
6

What is the change in atomic mass when an atom emits an alpha particle? A. decreases by 2 B. decreases by 1 C. decreases by 4 D.

remains the same
Chemistry
1 answer:
Misha Larkins [42]3 years ago
7 0
Answer is "C"

alpha decay is an emission of ₂⁴He nucleus. If an element undergoes an alpha decay, the mass of the daughter nucleus formed is reduced by 4 compared to mass of parent atom and atomic number is reduced by 2 compared to atomic number of parent atom.
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a 25 ml sample of gas is in a syringe at 22C if it was cool down to 0 C what will the volume of the gas become
Tpy6a [65]

Answer: 0.023 liters

Explanation:

Given that,

Original volume of gas (V1) = 25mL

[convert 25mL to liters

If 1000ml = 1L

25ml = 25/1000 = 0.025L]

Original temperature of gas (T1) = 22°C

[Convert 22°C to Kelvin by adding 273

22°C + 273 = 295K]

New volume of gas (V2) = ?

New temperature of gas (T2) = 0°C

[Convert 0°C to Kelvin by adding 273

0°C + 273 = 273K]

Since volume and temperature are given while pressure is held constant, apply the formula for Charle's law

V1/T1 = V2/T2

0.025L/295K = V2/273K

To get the value of V2, cross multiply

0.025L x 273K = 295K x V2

6.825L•K = 295K•V2

Divide both sides by 295K

6.825L•K/295K = 295K•V2/295K

0.023 L = V2

Thus, the new volume of the gas will be 0.023 litres

6 0
4 years ago
Naoh(aq)+(nh4)2so4(aq)→ express your answer as a chemical equation. enter noreaction if no reaction occurs. identify all of the
ycow [4]

The reaction between sodium hydroxide and ammonium sulfate generates ammonia gas along with water and aqueous sodium sulfate. The reaction can be shown as follows:

2NaOH(aq) + (NH4)2SO4(aq) → 2NH3(g) + Na2SO4(aq) + 2H2O(l)

The reaction can be further simplified to give a net ionic equation as:

2Na+(aq) + 2OH-(aq) + 2NH4+(aq) + SO42-(aq) →

                                                     2NH3(g) + 2Na+(aq) + SO42-(aq) + 2H2O(l)

Net ionic:

OH-(aq) + NH4+(aq) ↔ NH3(g) + H2O(l)


7 0
3 years ago
Read 2 more answers
Compound W, C8H17Br, and X, C8H17Cl, are products of the radical bromination (W), and chlorination (X), of 2,4-dimethylhexane. W
oksian1 [2.3K]

Answer:

The possible structures are shown in figure.

Explanation:

The seven isomers that could be formed from the given compound due to radical halogenation are shown in the figure.

We have mentioned only chlorine as group for showing just the chiral nature of the compound.

A chiral compound has a carbon with all the four groups different from each other.

There are three structures which are chiral (as shown).

W is the brominated product

X is the chlorinated product.

1) W reacts readily in water to form a chiral substitution product Y, C8H17OH.

Reaction of a single enantiomer of W produces a single enantiomer of Y as the only substitution product.: It means that the substitution is SN2 which is possible if the compund is not tertiary.

2) X likewise reacts readily in water though at a slower rate than W; a chiral substitution product Z, C8H17OH, is again formed. Unlike W, however, reaction of a single enantiomer of X produces Z that is nearly racemic.

It means that it will undergo SN1 reaction,. So the alkyl halide must be tertiary.

The possible structures are shown in figure.

5 0
4 years ago
The physical process of evaporation involves
kogti [31]
The physical process of evaporation involves water and the sun
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3 years ago
The map below shows areas on Earth that show evidence of once have glaciers.
never [62]
Yes it is C. Plate tectonics have little to no coo riparian with glaciers and global temperatures.
3 0
3 years ago
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