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Kisachek [45]
2 years ago
7

Select the correct answer. if two half-lives have passed since a scientist collected a 1.00-gram sample of u-235, how much u-235

is left now? a. 0.001 g b. 0.100 g c. 0.250 g d. 0.450 g e. 3.00 g
Chemistry
1 answer:
Ugo [173]2 years ago
3 0

Answer:

0.25 g of U-235 isotope will left .

Formula used :

where,

N = amount of U-235 left after n-half lives = ?

= Initial amount of the U-235 = 1.00 g

n = number of half lives passed = 2

0.25 g of U-235 isotope will left .

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Based on the law of conservation of matter, describe the relationship between the mass of the recants, and the mass of the produ
BaLLatris [955]

Answer:

Mass of reactant and mass of product must be equal.

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

5 0
3 years ago
Which species has the shortest carbon-nitrogen bond, CH3CN, CH3NH2, or CH2NH? acetonitrile methylamine methanimine (c) Which spe
Arturiano [62]

Answer:

Shortest carbon-nitrogen bond = CH3CN, strongest carbon-nitrogen bond = CH3CN

Explanation:

Bond length is defined as the distance between the centers of two covalently bonded atoms, in this case; carbon and hydrogen.

The length of the bond is determined by the number of bonded electrons (the bond order).

The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length.  

Therefore, bond length increases in the following order: triple bond < double bond < single bond.

CH3CN - There's a triple bond between Carbon and Nitrogen

CH3NH2 - The bond between carbon and nitrogen is a single bond.

CH2NH - The bond between carbon and nitrogen is a double bond.

The specie with the shortest carbon-nitrogen bond is CH3CN (acetonitrile).

The species with the strongest carbon-nitrogen bond is also CH3CN (acetonitrile) because it contains a triple bond. A triple bond contains one sigma and 2 pi bonds. The energy required to break it is more when compared to the other bonds hence, it is the strongest bond.

6 0
3 years ago
What force is the type of intermolecular force that would be present between molecules of Cl2 ?
KatRina [158]

Cl2 is nonpolar so it has to be only London dispersion force (LDF)

7 0
3 years ago
Read 2 more answers
A gas is contained in a horizontal cylinder with a moveable piston of cross-sectional area 0.33\text{ m}^20.33 m 2 . The region
-BARSIC- [3]

Answer:

0.02 m

Explanation:

∆U = q + w

w = ∆U - q = (1380 - 2040) J = -660 J

w = -p∆V = -pA∆h

∆h = -w/(pA)

p = 1 bar × (100000 Pa/1 bar) = 100000 Pa

∆h = -(-660 J)/(100000 Pa×0.33 m²) = 0.02 m

4 0
3 years ago
To prevent tank rupture during deep-space travel, an engineering team is studying the effect of temperature on gases confined to
uranmaximum [27]

Answer: 63.88 atm

Explanation:

To answer this, we use the formula PV = nRT since the asumption is that the gas has an ideal behavior

where number of mole = 2.60 mol, R(gas constant) = 0.08205746 L atm/K mol,

T = 251 ∘C = (251 + 273) K = 524 K, Volume = 1.75 L

Making Pressure the subject of the formula, we have

P = nRT/V = 2.6 * 0.08205746 * 524/2.75 = 63.88 atm

6 0
3 years ago
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