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3 years ago

What is an echo? (1 point)

Chemistry

2 answers:

makvit [3.9K]3 years ago

6 0

The reflection of sound waves, hope this helps :)

zaharov [31]3 years ago

4 0

Answer:

The reflection of sound waves

Explanation:

An echo is a reflection of sound that bounces of of one thing to another.

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An unknown amount of mercury (II) oxide was decomposed in the lab. Mercury metal was formed and 5.20 L of oxygen was released at

Yakvenalex [24]

Answer:

68.3g

Explanation:

1. Word equation:

mercury(II) oxide → mercury + oxygen

2. Balanced molecular equation:

2HgO → 2Hg + O₂(g)

3. Mole ratio

Write the ratio of the coefficients of the substances that are object of the problem:

$2molHgO/1molO_2$

4. Calculate the number of moles of O₂(g)

Use the equation for ideal gases:

$pV=nRT\\\\\\n=\dfrac{pV}{RT}\\\\\\n=\dfrac{0.970atm\times5.20L}{0.08206atm.L/K.mol\times 390.0K}\\\\\\n=0.1576mol$

5. Calculate the number of moles of HgO

$\dfrac{2molHgO}{1molO_2}\times 0.1576molO_2=0.315molHgO$

6. Convert to mass

mass = # moles × molar mass

molar mass of HgO: 216.591g/mol

mass = 0.315mol × 216.591g/mol = 68.3g

7 0

3 years ago

What are some physical means of separating something?

Alika [10]

Mixtures come in many forms and phases. Most of them can be separated, and the kind of separation method depends on the kind of mixture it is. Below are some common separation methods:

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2 years ago

Refusing to take part in sexual activity is called sexual abstinence? True or false.

Temka [501]

Answer:

true.

Explanation:

5 0

2 years ago

Read 2 more answers

Find the density of a piece of glass with a mass of 500g and a volume of 200cm3

kykrilka [37]

Density = mass/volume
D = 500 g /200 cm^3
D = 2.5 g/cm^3

hope this helps!

3 0

3 years ago

how does an airplane’s kinetic energy and potential energy change as it takes off and lands? How does this energy change relate

mojhsa [17]

Answer: As the airplane goes higher, the mechanical energy is changed into gravitational potential energy. While flying, some energy is lost through drag to thermal (heat) energy and sound energy. Some is also lost as the plane makes the air around it move. ... As speed and height decrease, kinetic and potential energy decrease.

Explanation:

Hope this help

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3 years ago