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sergiy2304 [10]

3 years ago

13

Relating ideas explain why ionic crystals melt at much higher temperatures than typical covalent molecular crystals.

1 answer:

gayaneshka [121]3 years ago

6 0

Because of the way the temp is set up

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Wave crests in a pond are separated by 0.2 m. The period of these waves is 0.2 s. What is the speed at which these waves travel?

romanna [79]

The crest is cover distance. <span>The </span>speed<span> of a wave indicate how fast wave is moving. </span>T<span>he speed is the distance traveled by a crest in a given interval of time. Greater distance in same amount of time means wave travel faster.
speed of wave = distance/time.
speed of wave = 0,2 m </span>÷ 0,2 s = 1 m/s.

6 0

3 years ago

What is the correct name for this formula: AI2O3?

agasfer [191]

Answer- A

Explanation- Because you have to look at the symbols and remember which symbol goes with each chemical, if you don't then you could get confused.

5 0

3 years ago

What do you call the things in an experiment that must be the same to make it fair

Pavel [41]

Answer:

controlled variables

Explanation:

3 0

2 years ago

Read 2 more answers

What is the percentage by mass of sulphur in Al2(SO4)3[A12SO4 =<br>342g/mol, S = 32]

valentinak56 [21]

Answer: The percentage by mass of sulphur in $Al_2(SO_4)_3$ is 9.36%

Explanation:

Mass percent of an element is the ratio of mass of that element by the total mass expressed in terms of percentage.

${\text {Mass percentage}}=\frac{\text {mass of sulphur}}{\text {Total mass}}\times 100\%$

Given: mass of sulphur = 32 g/mol

mass of $Al_2(SO_4)_3$ = 342 g/mol

Putting in the values we get:

${\text {Mass percentage}}=\frac{32g/mol}{342g/mol}\times 100\%=9.36\%$

The percentage by mass of sulphur in $Al_2(SO_4)_3$ is 9.36%

4 0

3 years ago

Aluminum has a face-centered cubic unit cell. How many atoms of Al are present in each unit cell

Serjik [45]

Answer:4

Explanation:

As shown in the image attached, a face-centred cubic structure has 8 atoms at the corners and 6 face center atoms.

Each corner atom contributes to eight cell, so per unit cell 1/8 ×8 =1atom

Face center atoms contributes to two unit cells 1/2 × 6=3atoms

Total atoms =3+1=4atoms

Therefore the atoms in Al FCC per unit cell is 4

7 0

3 years ago