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3 years ago

Can someone pls help me with this its due in 20 minutes.

Chemistry

1 answer:

Shtirlitz [24]3 years ago

4 0

Answer:

15. The velocity of a sound wave is affected by two properties of matter: the elastic properties and density.

16. The greater the density of a medium, the slower the speed of sound. This observation is analogous to the fact that the frequency of a simple harmonic motion is inversely proportional to m, the mass of the oscillating object.

17. Temp °C 0 m/s2 m/s

50 360.51 361.62

18. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second. ... The speed of sound is also affected by other factors such as humidity and air pressure.

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Identifying Characteristics of Atoms

Anon25 [30]

Explanation:

The number of protons in an atom is the atomic number.

Mass number is the number of protons plus neutrons in an atom.

Mass number = number of protons + number of neutrons

Atomic number = number of protons

Atomic number gives the symbol of the element

Number Number Atomic Mass Symbol

Protons neutrons Number Number

A 7 B 15 C

D E 26 56 F

A, number of protons = B

Mass number = protons + neutrons

15 = protons + 7

Protons = 15 - 7 = 8

Atomic number 8 is for oxygen = C

Atomic number = number of protons = D = 26

Number of neutrons ;

E = Neutrons = mass number - protons = 56 - 26 = 30

Atomic number 26 is for Iron = F

8 0

3 years ago

Predict how many electrons will Li (lithium) most likely be gained or lost

Effectus [21]

Answer:

Lithium will lose about 2 electrons

Making it a cation

4 0

3 years ago

Read 2 more answers

What is the atomic mass?

labwork [276]

Answer:

Sonic has your answer The atomic mass is the mass of an atom. Although the SI unit of mass is kilogram, the atomic mass is often expressed in the non-SI unit dalton where 1 dalton is defined as ¹⁄₁₂ of the mass of a single carbon-12 atom, at res

8 0

3 years ago

What is the molarity of a solution of sulfuric acid if 49.0 mL of it are neutralized by a titration

vaieri [72.5K]

Answer:

THE MOLARITY OF THE ACID IS 0.232M

Explanation:

Molarity is the number of moles of solute per liter of a solution.

In titration, the molarity of the acid and the molarity of the base are related by this equation:

Ca VA / CbVb = na / nb

Ca = concentration of the acid = ?

Va = volume of the acid = 49 mL

Cb = concentration of the base = 0.333M

Vb = volume of the base = 68.4mL

Na = number of mole of acid = 1

Nb = number of mole of base = 2

Equation for the reaction:

H2SO4 + 2NaOH --------> Na2SO4 + 2H2O

Solving for the molarity of the acid, we have :

Ca = CbVbNa / VaNb

Ca = 0.333M * 68.4mL * 1 / 49mL *2

Ca = 22.7772 * 10^-3 / 98 *10^-3

Ca = 0.232M

The molarity of the acid is therefore 0.232M.

8 0

3 years ago

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Please select the best answer and click "submit."

vladimir1956 [14]

When it comes to physical changes like phase changes, there are two types of heat energy: sensible heat and latent heat. Sensible heat is the heat absorbed/released when you heat the substance but it doesn't change phase. An example would be heating lukewarm water. The substance is liquid all throughout. Latent heat, on the other hand, is the heat absorbed/released when there is a phase change. An example would be boiling water, because it changes liquid to vapor.

Hence, for freezing liquid, you use the latent heat, specifically the heat of fusion. The answer should be

2.5 g * (1 mol/18.02 g) * 6.03 kJ/mol = 0.84 kJ/mol

The answer is not in the choices. You only use Hvap if you boil water.

5 0

3 years ago