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3 years ago

What characterizes a homogeneous mixture?

1 answer:

4 0

A homogeneous mixture is uniform throughout, like water that has dissolved gases. You cannot easily distinguish the individual parts of the mixture. Many other drinks are considered homogeneous too. Laundry detergent and colognes are other examples of homogeneous mixtures. Homogeneous mixtures can also be a solid (ie. steel), liquid or gas form. It does not always have to be a liquid.

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Which of the following observations indicates that an atom has neutrons? (5 points)

finlep [7]

Please link those observations so we can answer your question. have a good day <3

8 0

3 years ago

Please just look up stuff about helium and put it in your own words 3-5 parts ill give brainly

andreyandreev [35.5K]

Answer:

Element Name & Symbol: Helium, He

Element Family : Noble Gasses

Atomic Number: 2

Atomic Mass: 4

Answer from Gauthmath

6 0

3 years ago

Read 2 more answers

A 6.87-L sample of gas has a pressure of 0.732 atm and a temperature of 95 °C. The sample is allowed to expand to a volume of 9.

Jlenok [28]

Answer: The new pressure of the gas, assuming that no gas escaped during the experiment is 0.470 atm

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1$ = initial pressure of gas = 0.732 atm

$P_2$ = final pressure of gas = ?

$V_1$ = initial volume of gas = 6.87 L

$V_2$ = final volume of gas = 9.22 L

$T_1$ = initial temperature of gas = $95^oC=273+95=368K$

$T_2$ = final temperature of gas = $44^oC=273+44=317K$

Now put all the given values in the above equation, we get:

$\frac{0.732\times 6.87}{368}=\frac{P_2\times 9.22}{317}$

$P_2=0.470atm$

Thus the new pressure of the gas, assuming that no gas escaped during the experiment is 0.470 atm

7 0

4 years ago

The second reaction in the formation of sulfuric acid occurs slowly.

rjkz [21]

<u>Answer:</u> The correct option is $NO_2(g)$

<u>Explanation:</u>

A catalyst is defined as the chemical species that increases the reaction rate but does not participate in it and is left behind after the completion.

A homogeneous catalyst is one that is present in the same phase as the reactants and products.

A heterogeneous catalyst is one that is present in different phase as that of reactants and products.

For the given chemical reaction:

$2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)$

As all the reactants and products are in gaseous state so, the homogeneous catalyst must also be in the gaseous state only.

Hence, the correct option is $NO_2(g)$

5 0

3 years ago

A solution is composed of 1.15 mL of diethyl ether (C4H10O, density=0.7134 g/mL) dissolved in 78.85 mL of dichloromethane (CH2Cl

jeka94

Answer:

Molarityof the solution is 0.1375 M.

Explanation:

We will first find the number of moles of diethyl ether (C4H10O) by finding its molar mass and measured mass.

Molar mass of diethyl ether (C4H10O) = 74.12 g.

Now, volume of diethyl ether (C4H10O) = 1.15 mL and its density = 0.7134 g/mL.

Therefore, measured mass of diethyl ether (C4H10O) = volume x density = 1.15 mL x 0.7134 g/mL = 0.82 g.

Now, number of moles of diethyl ether (C4H10O) = $\dfrac{Measured \ mass}{ Molar\ mass}$ $= \frac{0.82\ g}{74.12\ g}$

= 0.011 Moles.

Volume of the solution = volume of diethyl ether + volume of dichloromethane = 1.15 mL + 78.85 mL = 80 mL.

Now, molarity of the solution = Number of moles of diethyl ether / Volume of the solution( in mL) x 1000 = $\dfrac {0.011}{80}\times 1000 = 0.1375\ M$

8 0

3 years ago