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3 years ago

A sound wave has a wavelength of 0.7 miles and a frequency of 500 Hertz what is the speed

Chemistry

1 answer:

yaroslaw [1]3 years ago

4 0

speed equals wavelength times frequency so

.7 x 500 = 350

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A model of the water cycle was made by placing a heat lamp over a glass jar half full of water. Which part of the water cycle ca

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Answer: C- Evaporation

Explanation:

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3 years ago

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A beaker cost 8.40$and Harry drops 3 dozen beakers. How much will Harry's chemistry teacher charge

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Answer:

302.40

Explanation:

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3 years ago

Calculate ΔHo for the following reaction ussing the given bond dissociation energiesCH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)BOND

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Answer:

The ΔH° for the following reaction is -794 kJ, hence exothermic reaction,

Explanation:

$CH_4(g) + 2O_2(g)\rightarrow CO_2(g) + 2H_2O(g) ,$ ΔH° = ?

We are given with:

$\Delta H_{O-O}=142 kJ/mol$

$\Delta H_{O=O}=498 kJ/mol$

$\Delta H_{H-O}=459 kJ/mol$

$\Delta H_{C-H}=411 kJ/mol$

$\Delta H_{C-O}=358 kJ/mol$

$\Delta H_{C=O}=799 kJ/mol$

ΔH° =

(Energies required to break bonds on reactant side) - (Energies released on formation of bonds on product side)

$\Delta H^o=(1 mol\times 4\times \Delta H_{C-H}+2 mol\times 1\times \Delta H_{O=O})-(1 mol\times 2\times \Delta H_{C=O}+2 mol\times 2\times\Delta H_{H-O})$

$\Delta H^o=(1 mol\times 4\times 411 kJ/mol+2 mol\times 1\times 498 kJ/mol)-(1 mol\times 2\times 799 kJ/mol+2 mol\times 2\times 459 kJ/mol)$

$\Delta H^o=-794kJ$

$\Delta H^o>0$ endothermic reaction

$\Delta H^o$ exothermic reaction

The ΔH° for the following reaction is -794 kJ, hence exothermic reaction,

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4 years ago

We can change gas to a liquid by(Increasing, decreasing, removing) the temperature and (increasing, decreasing, removing ) the p

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Decreasing

Increasing

Explanation:

We can change gas to liquid by decreasing the temperature and increasing the pressure.

Temperature is the degree of hotness or coldness of a body.
It is a function of how much heat it has absorbed or lost.
Heat causes the thermal energy of a system to increase and the particles becomes randomized.
Pressure is the force per unit area of particles.
If we decrease the temperature of gases, they have less kinetic energy and entropy reduces.
The will not be random.
Further increasing their pressure will bring them together and make them flow like liquid.
This phase change is often called condensation.

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Phase change brainly.com/question/1875234

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3 years ago

Scientific predictions based on laws are formulated using:

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Answer:

A. deductive reasoning

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4 years ago

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