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3 years ago

Mechanical waves that travel through

Chemistry

2 answers:

Arisa [49]3 years ago

4 0

Answer: d. a medium

Explanation: Mechanical waves are waves are oscillations of matter and thus transfer energy through material medium unlike electromagnetic waves which do not require material medium to propagate.

Mechanical waves may be longitudinal or transverse waves.

Sound waves are example of mechanical waves and thuds cannot travel in vacuum whereas light is an electromagnetic wave which can travel in vacuum.

lina2011 [118]3 years ago

3 0

D) A medium. They cant travel through space or black holes and space is a vacuum

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Arrange the metals used in this experiment (including H2 and Ag) in order of decreasing reactivity (most reactive metal first).

jarptica [38.1K]

Answer:

Na, Ca, Mg, All, Zn, Fe, Sn, Pb, H2, Cu, Ag

Explanation:

This is how metals are arranged in the electrochemical series.

Use the following to remember the order:

King Nathan Can Manage All Zone Freely Since Probably He Can Handle All Ages

Each word represent the order

K, Na, Ca, Mg, All, Zn, Fe, Sn, Pb, H2, Cu, Hg, Ag, Au

6 0

4 years ago

Using a molar heat of combustion of hexane (C6H14) –4163 kJ/mol, the mass of hexane required to increase the temperature of 1.76

pshichka [43]

Answer:

7.46 g.

Explanation:

Firstly, we need to calculate the amount of heat needed to warm 5.64 kg of water from 21.0°C to 70.0°C using the relation:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by water (Q = ??? J).

m is the mass of water (m: we will determine).

c is the specific heat capacity of water (c = 4.186 J/g.°C).

ΔT is the temperature difference (final T - initial T) (ΔT = 70.0 °C - 21.0 °C = 49.0 °C).

To determine the mass of 1.76 L of water we can use the relation:

mass = density x volume.

density of water = 1000 g/L & V = 1.76 L.

∴ mass = density x volume = (1000 g/L)(1.76 L) = 1760.0 g.

∵ Q = m.c.ΔT

∴ Q = m.c.ΔT = (1760.0 g)(4.186 J/g.°C)(49.0 °C) = 360483.2 J ≅ 360.4832 kJ.

As mentioned in the problem the molar heat of combustion of hexane is - 4163.0 kJ/mol.

Using cross multiplication we can get the no. of moles of hexane that are needed to be burned to release 360.4832 kJ:

Combustion of 1.0 mole of methane releases → - 4163.0 kJ.

Combustion of ??? mole of methane releases → - 360.4832 kJ.

∴ The no. of moles of hexane that are needed to be burned to release 360.4832 kJ = (- 360.4832 kJ)(1.0 mol)/(- 4163.0 kJ) = 0.0866 mol.

Now, we can get the mass of hexane that must be burned to warm 1.76 L of water from 21.0°C to 70.0°C:

∴ mass = (no. of moles needed)(molar mass of hexane) = (0.0866 mol)(86.18 g/mol) = 7.46 g.

5 0

3 years ago

Hydrogen cab be obtained economically as a byproduct in the electrolysis of____________

yarga [219]

Water, because electrolysis is using electricity to break the bond of water to release 2 Hydrogens and the 1 Oxygen.

4 0

3 years ago

Can someone explain how you get the answers to these questions?? i really need help !!!

atroni [7]

The balanced chemical equations are as follows:

AlBr₃ + K → 3 KBr + Al
FeO + PdF₂ → FeF₂ + PdO
P₄ + 6 Br₂ → 4 PBr₃
2 LiCl + Br₂ → 2 LiBr + Cl₂

<h3>What are balanced chemical equations?</h3>

Balanced chemical equations in which the moles of atoms of elements taking part in a reaction are balanced on both sides of the equation.

The balancing of chemical equations follows the law of conservation of mass which states that matter can neither be created nor destroyed.

In balancing of chemical equations, the following steps are follows:

ensure that the all the substances involved are written in the equation
do not alter the formula of compounds or molecules
add numerical coefficients in front of the compounds and molecules to ensure that the moles of atoms of elements are balanced on both sides of the equation

In conclusion, a balanced chemical equation obeys the law of conservation of mass.

Learn more about balancing of chemical equations at: brainly.com/question/17056447

#SPJ1

5 0

2 years ago

The force of attraction between one polar molecule and another polar molecule is

Keith_Richards [23]

Answer:

Dipole-dipole forces

Explanation:

A polar compound is that compound which contains atoms that have a difference in charges i.e electrostatic attraction occurs between its constituent atoms. Polar molecules are attracted to other polar molecules with opposite charges and her held together with the aid of certain forces

The attractive force between the negative part of a polar molecule (-) and the positive part of another polar molecule (+) is called DIPOLE-DIPOLE FORCES. This dipole-dipole force gets stronger with an increasing polarity of the molecules involved.

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3 years ago