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Oksanka [162]
3 years ago
13

Describe two ways you think a sound wave could be stopped or could change change direction.

Chemistry
2 answers:
Alla [95]3 years ago
8 0

Answer:

Like any wave, a sound wave doesn't just stop when it reaches the end of the medium or when it encounters an obstacle in its path. Rather, a sound wave will undergo certain behaviors when it encounters the end of the medium or an obstacle. Possible behaviors include reflection off the obstacle, diffraction around the obstacle, and transmission (accompanied by refraction) into the obstacle or new medium

IRINA_888 [86]3 years ago
3 0

Answer:When sound waves move from one medium to another, there will be changes to the velocity (or speed), frequency and wavelength of the sound wave. This change in velocity can also result in a change of direction of the sound wave - also known as refraction

Explanation:

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Consider the molecules HCl, HBr, HF, and HI. Which would you expect to have the highest boiling point and why
FrozenT [24]

Answer:

C) HF, because it has the strongest intermolecular force  

Explanation:

The electronegativity difference ΔEN between H and F is so high that HF has especially high dipole-dipole forces, which we call hydrogen bonds. They are the strongest intermolecular forces, and they are responsible for the high boiling point of HF.

A) is wrong. HI has a higher mass and more electrons than HBr.

B) is wrong. There is no hydrogen bonding in HCl.

D) is wrong. There are no ion-dipole forces in HI.

7 0
3 years ago
How many electrons are in 0.990 oz of a pure gold coin?
sleet_krkn [62]

Atomic number of gold, Au = 79 means there are 79 electrons in per atom of gold.

Atomic mass of gold = 196.967 gm

0.990 oz of gold is given.

Now, converting oz to gm

1 oz = 28.3495 gm

So, 0.990 oz = 0.990\times 28.3495 gm = 28.066 gm

Now, for determining the number of moles, the formula for number of moles is:

number of moles = \frac{given mass}{Molar mass}

Substituting the values:

number of moles = \frac{28.066}{196.967} = 0.1425 mole

1 mole of Au = 6.022\times 10^{23} atoms of Au

So, for 0.1425 mole of Au = 6.022\times 10^{23}\times 0.1425 atoms of Au = 0.8581 \times 10^{23} atoms of Au

Since 1 atom of gold has 79 electrons so,

Number of electrons = 0.8581 \times 10^{23}\times 79 = 67.7899\times 10^{23} electrons

So, number of electrons in 0.990 oz of pure gold coin is 67.7899\times 10^{23}.

7 0
3 years ago
When calculating the density of a liquid you measure 8.2 ml in a graduated cylinder with markings every 1 ml and measure the mas
Inessa05 [86]
I think it is 1.1g/mL if i got my sig figs down

5 0
3 years ago
Could someone please help me? You can ignore number 3:)
il63 [147K]

Answer:

Question 2: Because the elements could be unstable, forming elemental compounds.

Question 1: Water is made up of Hydrogen and oxygen, which is namely called H2^o What makes it a pure substance is the little mass and molecules it's made up of.

6 0
2 years ago
Which pair below describes isotopes of the same element? A) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6
leonid [27]
An isotope is an atom with a different number of neutrons than another atom of the same element. Since atoms of the same element all have the same number of protons, choice B(6pro &6neu vs. 6pro&7neu) is an example of isotopes
7 0
3 years ago
Read 2 more answers
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