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3 years ago

Can anyone help me please

Chemistry

2 answers:

JulijaS [17]3 years ago

5 0

Matter either loses or absorbs energy when it changes from one state to another.

antiseptic1488 [7]3 years ago

3 0

Answer: Matter either loses or absorbs energy when it changes from one state to another.

Explanation: "For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. ... The amount of energy in matter can be measured with a thermometer."

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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

Is CH3NH3Br acidic, basic, or neutral?

prisoha [69]

Answer:

Basic I think

Explanation:

Im kinda of sure

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3 years ago

Choose a reasonable explanation to account for the differences. There may be more than one possible reason that makes sense, jus

Ugo [173]

Answer:

A. It is possible not all of the water was evaporated from the sand, causing the recovered mass to be higher

D. While drying the NaCl, the liquid boiled and some splattered out of the evaporating dish, causing the recovered mass to be higher.

Explanation:

Sand absorbs water and stores it. The sunlight causes the water to evaporate but sand can hold some of the water inside it. This results in increase in mass of the sand. The mass of sand before and after the water evaporation can be different.

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3 years ago

In 1938, Otto Hahn and Fritz Strassman discovered that uranium nuclei could spit and form smaller nuclei, or different elements.

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3 years ago

Read 2 more answers

1. Aluminum foil reacts with aqueous copper (II) chloride (<br> Type of Reaction:

zloy xaker [14]

Answer:

I believe its a single replacement reaction

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2 years ago