CHEMISTRY HIGH SCHOOL

The density of lead is 11.4 g/cm3 at 20°C. A chemist has a metallic sample that is either pure lead or mostly lead. If the density of the sample is 11.0 g/cm3 at 20°C, then the sample most likely is _____. A. pure lead
b. lead mixed with heavier substances
c. lead mixed with lighter substances

Answers

Answer 1

Answer:

Answer:

The correct answer is option c.

Explanation:

Density is defined as mass present in unit volume of the substance.

$Density=(Mass)/(Volume)$

Given that density of pure lead is more than that of the sample.

Density of lead = $11.4 g/cm^3$

Density of sample = $11.0 g/cm^3$

Since, we know that density is directly linked to mass of the substance. So with decrease in density of substance indicates that mass present in unit volume of the substance has also decreased.

The reason behind the less density of sample from lead was that, that it was made up lead and other light substance.

Answer 2

Answer: The sample is most likely lead with lighter substances in it. Pure lead would be closer to the pure lead density, and heavier substances would make the density more, not less.

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One mole of an ideal gas is held at standard conditions. At what Kelvin temperature would the pressure be doubled?

1 What do strong acids and strong bases have in common?A They both partially dissociate, with reverse reactions occurring.
B They both dissociate completely, with little or no reverse reactions.
C They both remain intact when placed in water, with no dissociation taking place.
D They both dissociate completely, with reverse reactions constantly taking place.

2 What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?
A Matter changes to a solid state.
B Matter changes to a liquid state.
C Matter changes to a plasma state.
D Matter changes to a gaseous state.

3 Consider a balloon that has a volume V. It contains n moles of gas, it has an internal pressure of P, and its temperature is T. If the balloon is heated to a temperature of 15.5T while it is placed under a high pressure of 15.5P, how does the volume of the balloon change?
A It doubles.
B It stays the same.
C It increases greatly.
D It decreases slightly.

Answers

1) Answer is: B They both dissociate completely, with little or no reverse reactions.

Some of strong acids: HNO₃(nitric acid), HCl(hydrochloric acid), H₂SO₄(sulfuric acid), HI(hydroiodic acid). Strong bases are: sodium hydroxide (NaOH), barium hydroxide (Ba(OH)₂).

For example, hydrochloric acid, completely dissociate in water and give large amount of hydrogen ions (H⁺): HCl(aq) → H⁺(aq) + Cl⁻(aq).

Sodium hydroxide completely dissociate in water:

NaOH(aq) → Na⁺(aq) + OH⁻(aq).

2) Answer is: C Matter changes to a plasma state.

Plasma is a an ionised gas with highly electrical conductivity.

In solid, molecules are closely packed, stiff and do not changes of shape or volume. Solid object (for example iron) does not take on the shape of its container.

Liquids have definite volume, but no fixed shape.

Gases (for example nitrogen and neon) not have definite volume and fixed shape, it depends on its container.

3) Answer is: B It stays the same.

p₁ = P; initial pressure.

p₂ = 15.5 P; final pressure.

V₁ = V: initial volume.

V₂ = ?: final volume.

T₁ = T; initial temperature.

T₂ = 15.5T; final temperature.

The combinated gas law: The volume of a given amount of gas is proportional to the ratio of its Kelvin temperature and its pressure: p₁·V₁/T₁ = p₂·V₂/T₂.

P·V/T = (15.5P · V₂) / 15.5 T.

V₂ = V₁ = V.

Answer:

1). B

2). C

3). B

Explanation:

How many moles of silver chloride are produced from 15.0 mol of silver nitrate?

Answers

Answer:

15 moles

Explanation:

Which of the following was NOT a conclusion of Rutherford’s gold foil experiment? a. The atom is mainly empty space
b. The nucleus has a negative charge
c. The atom has a dense nucleus
d. Alpha particles can pass through a thin sheet of gold foil
e. All of the above are correct regarding the gold foil experiment

Answers

The answer is b.) The nucleus has a negative charge

It was not a conclusion because it is neutral. It is not positive nor negative.

The percent by mass of carbon in HC2H3O2 is equal to__.

Answers

The percent mass of carbon is found by dividing the total mass of the carbon in the compound by the total mass of the compound itself. The mass of the compound is found by adding the molecular masses of the elements. The mas of the compund is 60 grams/mole. There are two Carbon atoms in the compound and each Carbon atom weighs 12 grams/mole, so two Carbon atoms weigh 24 grams/mole. The percent by mass of Carbon is (24grams/mole) divided by (60 grams/mole) times 100 which is equal to 40%. The correct answer is 40%.

Final answer:

The percent by mass of carbon in acetic acid (HC2H3O2) is calculated using the molar masses of its constituent elements. Upon calculation, it is determined that the percent by mass of carbon in acetic acid is 40.00%.

Explanation:

To calculate the percent by mass of carbon in acetic acid (HC2H3O2), we need to use the molar masses of the elements involved. The formula for acetic acid includes two carbon atoms, four hydrogen atoms, and two oxygen atoms. Using the given molar masses (carbon: 12.01 g/mol, hydrogen: 1.008 g/mol, oxygen: 16.00 g/mol), the molar mass of acetic acid can be calculated as follows:

Carbon: 2 × 12.01 g/mol = 24.02 g/mol
Hydrogen: 4 × 1.008 g/mol = 4.032 g/mol
Oxygen: 2 × 16.00 g/mol = 32.00 g/mol

Adding these together gives the molar mass of acetic acid as 60.052 g/mol.

To find the percent by mass of carbon, we take the total mass of carbon in the compound and divide it by the total molar mass of the compound:

(24.02 g/mol / 60.052 g/mol) × 100% = 40.00%

Therefore, the percent by mass of carbon in acetic acid is 40.00%.

A bus traveled 280 kilometers between two cities . It left the first city at 3:00 p.m. and arrived at the second city at 7:00 p.m. What was the average speed of the bus during the trip ?

Answers

Answer:

70 kilometers per hour

Explanation:

280 kilometers ÷ 4 hours (7:00 pm - 3:00 pm = 4 hours) = 70 kilometers per hour

Hope this helps! Sorry if wrong. You are loved and you are beautiful/handsome!

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How many occupied orbitals does a fluorine atom contain in the ground state?

Answers

Well, the configuration is $1s^22s^22p^5$ . To show the electrons, we have 1s as [**], 2s as [**], 2p as [**][**][*-], where * is an electron and - is a vacant slot. We have 5 occupied orbitals (4 fully occupied, one partially occupied)