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2 years ago

A student listed the characteristics of chemical and nuclear reactions.

Chemistry

2 answers:

lidiya [134]2 years ago

7 0

Answer:

D. It is a chemical reaction because the total mass remains the same when new substances are formed.

Explanation:

A chemical reaction is represented by a chemical equation which show the reactant and products. Reactants are written on left side of arrow while products are written on right side. The number of atoms are remain same however arrangement of atoms is different on both side.

For example:

6H₂O + 6CO₂ + energy → C₆H₁₂O₆ + 6O₂

it is known from balanced chemical equation that 6 moles of carbon dioxide react with the six moles of water and created one mole of glucose and six mole of oxygen. The number of atoms are same on both side however arrangement of atoms is different.

While in case of nuclear reaction small change in mass take place.

sweet [91]2 years ago

7 0

Answer: D

Explanation: Just took the test

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mezya [45]

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LUCKY_DIMON [66]

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2 years ago

A gas mixture contains HBr, NO2, and C2H6 at STP.If a tiny hole is made in the container, which gas will effuse fastest?Which ga

MakcuM [25]

Explanation:

Molar mass of HBr = 81 g/mol

Molar mass of nitrogen dioxide gas = 46 g/mol

Molar mass of ethane = 30 g/mol

Graham's Law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$

So, the gas with least molar mass will effuse out fastest from the container and that is ethane gas.

The formula for average kinetic energy is:

$K.E=\frac{3}{2}kT$

where,

k = Boltzmann’s constant = $1.38\times 10^{-23}J/K$

T = temperature = 273.15 K ( at STP)

As we can see from the formula that kinetic energy depends upon only temperature of the gas molecule.

So, from this we can say that all the gas molecules have the same average kinetic energy at this temperature.

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3 years ago

What is the current in the 30 ohm heating coil of a coffee maker that operates on a 120 volt circuit?

SpyIntel [72]

Answer:

4Amps. i can't see other questions clearly

Explanation:

$using ohms law \\ v = ir$

V=120 volt
R=30ohms
I=?

I=V/R

I=120/30

I=4amps

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2 years ago

Why is the? The second ionization energy of sodium is about three times greater than the second ionization energy of magnesium

Scorpion4ik [409]

Answer:

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2 years ago