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3 years ago

Laney left a nail in water for two weeks, and the nail became rusted from sitting in the water.

Chemistry

1 answer:

Simora [160]3 years ago

5 0

B) A chemical change because the nail reacts with water/oxygen to create rust (a type of oxide)

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How many silver (Ag) atoms are in a silver bar that is 20.0 g? A. 1.3 3 1027 Ag atoms B. 6.02 3 1023 Ag atoms C. 1.1 3 1023 Ag a

postnew [5]

C. 1.1 3 1023 Ag atoms

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2 years ago

Read 2 more answers

A mixture of ethyl acetate vapour and air has a relative saturation of 50% at 303 K and a total pressure of 100 kPa. If the vapo

AURORKA [14]

Answer : The correct option is, (b) 0.087

Explanation :

The formula used for relative saturation is:

$\text{Relative saturation}=\frac{P_A}{P_A^o}$

where,

$P_A$ = partial pressure of ethyl acetate

$P_A^o$ = vapor pressure of ethyl acetate

Given:

Relative saturation = 50 % = 0.5

Vapor pressure of ethyl acetate = 16 kPa

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

$0.5=\frac{P_A}{16kPa}$

$P_A=8kPa$

Now we have to calculate the molar saturation.

The formula used for molar saturation is:

$\text{Molar saturation}=\frac{P_{vapor}}{P_{\text{vapor free}}}$

and,

P(vapor free) = Total pressure - Vapor pressure

P(vapor) = $P_A$ = 8 kPa

So,

P(vapor free) = 100 kPa - 8 kPa = 92 kPa

The molar saturation will be:

$\text{Molar saturation}=\frac{P_{vapor}}{P_{\text{vapor free}}}$

$\text{Molar saturation}=\frac{8kPa}{92kPa}=0.087$

Therefore, the molar saturation is 0.087

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3 years ago

An atom consits of electrons, protons

Svetach [21]

Answer:

electron: orbiting around the nucleus

proton: inside the nucleus

neutron: inside the nucleus

7 0

2 years ago

Read 2 more answers

How is a compound different from an element 2.3 lesson check?

zavuch27 [327]

Answer:

Element: Element are pure substance consist of same type of atoms
Compound: Form by combination of atoms of different elements.

Distinguish features:

Compounds represented by chemical formula while elements are represented by symbols.
Compounds have fixed ratios of atoms of different elements while in elements are distinguished by atomic no.
Compounds can be converted into simple substance by chemical methods but the elements cant be converted into simpler substance by means of chemical methods.

Example:

Water (H2O) is a compounds.
Iron (Fe) is an element.

Summary:

When two or more elements are mixed then compounds are formed.

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3 years ago

To what Celsius temperature must 67.0 mL of krypton gas at 18.0°C be changed so the volume will triple? Assume the pressure and

Mice21 [21]

Answer: 600°C

Explanation:

This reaction is explained by Charles' law as the pressure is constant.

From the question, we obtained:

V1 = 67mL

T1 = 18°C = 18 +273 = 291K

V2 = 3V1 ( Vol is tripled) = 3x67 = 201mL

T2 =?

Applying the Charles' law,

V1 /T1 = V2 /T2

67/291 = 201 / T2

Cross multiply to express in linear form.

67xT2 = 291x201

Divide both side by 67, we have:

T2 = (291x201) /67

T2 = 873K

Converting to Celsius temperature, we have

T°C = K — 273

T°C = 873 — 273 = 600°C

8 0

3 years ago