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3 years ago

8

The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different

elements is the
А.
electron
B
proton
neutron
D
atom

1 answer:

Mekhanik [1.2K]3 years ago

5 0

Answer

im not quite sure but I think the answer is <em>D atom</em><em> </em>

Explaination

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Sarah is in her chemistry lab doing an experiment. When she goes to take the mass of the chemical she is working with, she disco

cupoosta [38]

Answer:

10 x 5 = 50

Explanation:

50 is the mass of her chemical.

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3 years ago

For acidic solutions, which element is added to balance half-reactions

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For balancing acidic solutions, we would need to add H+ ions to the correct side of the equation to balance the total number of atoms and the overall charge.

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3 years ago

Read 2 more answers

2.00 moles of an ideal gas was found to occupy a volume of 17.4L at a pressure of 3.00 atm and at a temperature of 45 C. Calulat

lidiya [134]

Answer:

$0.082 atm L mol^{-1} K^{-1}$

Explanation:

The pressure, the volume and the temperature of an ideal gas are related to each other by the equation of state:

$pV=nRT$

where

p is the pressure of the gas

V is the volume of the gas

n is the number of moles

R is the gas constant

T is the absolute temperature

For the gas in this problem:

n = 2.00 mol is the number of moles

V = 17.4 L is the gas volume

p = 3.00 atm is the gas pressure

$T=45C+273=318 K$ is the absolute temperature

Solving for R, we find the gas constant:

$R=\frac{pV}{nT}=\frac{(3.00)(17.4)}{(2.00)(318)}=0.082 atm L mol^{-1} K^{-1}$

5 0

3 years ago

If the specific heat of iron is 0.449 J/g·K, what is the enthalpy change of this process for 100 g of Fe (s)? Is the process end

katrin2010 [14]

Full Question:

Although it is not really a chemical reaction, one could consider a cooling process to be analogous to the enthalpy change that occurs in a reaction. Consider the transformation

Fe (s, T = 300 K) → Fe (s, T = 250 K)

If the specific heat of iron is 0.449 J/g·K, what is the enthalpy change of this process for 100 g of Fe (s)? Is the process endothermic or exothermic? Explain.

Answer:

ΔH = - 2245J

Explanation:

Specific heat capacity, Cp = 0.449 J/g·K

ΔH=MCpΔT

ΔT = 250K - 300K = - 50K

ΔH = 100 * 0.449 * (-50)

ΔH = - 2245J

The iron will lose (give off) heat energy to cool down. Hence, it is an exothermic process. The negative sign of the enthalpy confirms this.

8 0

3 years ago

If ethanol has a density of 0.785g/mL, calculate the volume of 83.7 g of ethanol.

ratelena [41]

Answer:

<h2>106.62 mL</h2>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question

mass = 83.7 g

density = 0.785 g/mL

We have

$volume = \frac{83.7}{0.785} \\ = 106.62420$

We have the final answer as

<h3>106.62 mL</h3>

Hope this helps you

8 0

3 years ago