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2 years ago

Which of the following does NOT show a chemical change of matter?

Chemistry

1 answer:

Aneli [31]2 years ago

7 0

Answer:

C. Ice cracking

Explanation:

The composition of the ice is still the same therefore, it is an example of a physical change.

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A sound wave is traveling at 331 m/s and has a frequency of 126 Hz. What is the wavelength?

damaskus [11]

<h2>Answer</h2>

2.626984127 m

<h2>Explanation:</h2><h2></h2>

You have to know the equation that relates wavelength, frequency, and velocity (it's like speed but a bit different).

v = f x λ

where:

v = velocity

f = frequency

λ = Wavelength

Rearrange to make λ subject:

λ = v / f

We've been given 331 as the speed, 126 as the frequency. Sub it into the equation:

331 / 126 = 2.626984127 m

3 0

2 years ago

Which resource is renewable?<br> coal <br> oil<br> steel<br> wind

Digiron [165]

Answer: wind

Explanation:

5 0

2 years ago

Read 2 more answers

The smallest particle of an element is a(n) .<br>atom<br>molecule<br>DNA

mamaluj [8]

Answer:

An atom is the smallest particle of an element

5 0

2 years ago

Name two compounds with more exothermic lattice energies than scandium oxide and justify your choice.

N76 [4]

Answer:

1 . $Al_2O_3$

2. $TiO_2$

Explanation:

The more stable the ionic compound, the more is it lattice energy.

The more the charge on the cation and the anion, the greater is the lattice energy.
The less the size of the cation and the anion, the greater is the lattice energy.

Scandium oxide ( $Sc_2O_3$ ) is an oxide in which $Sc^{3+}$ behaves as cation and $O^{2-}$ behaves as anion.

The compounds which has higher lattice energy than scandium oxide are:

1 . $Al_2O_3$

This is because the charge are same on the cation and the anion as in the case of the Scandium oxide but the size of the cation $Al^{3+}$ is smaller than $Sc^{3+}$ . Thus, this corresponds to higher lattice energy.

2. $TiO_2$

This is because the charge on the cation $Ti^{4+}$ is greater than that of $Sc^{3+}$ and also the size of the cation $Ti^{4+}$ is smaller than $Sc^{3+}$ . Thus, this corresponds to higher lattice energy.

3 0

3 years ago

Please, Give the correct answer ! Don't spam comment

mars1129 [50]

Answer:

hxuyufydufiduud

Explanation:

chdckjxxhtxgx

5 0

3 years ago