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3 years ago

If an unknown substance CANNOT be broken down into simpler substances, it is

Chemistry

2 answers:

Fynjy0 [20]3 years ago

7 0

If an unknown substance CANNOT be broken down into simpler substances, it is AN ELEMENT made of one kind of atom.

7nadin3 [17]3 years ago

3 0

Answer:

element

Explanation:

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(a) Calculate the density of a 374.5-g sample of copper if it has a volume of 41.8 cm3. (b) A student needs 15.0 g of ethanol fo

o-na [289]

Answer:

For a: The density of the sample of copper is $8.96g/cm^3$

For b: The volume of ethanol needed is 19.0 mL

For c: The mass of mercury is 340. grams

Explanation:

To calculate density of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$ ......(1)

For a:

Mass of copper = 374.5 g

Volume of copper = $41.8cm^3$

Putting values in equation 1, we get:

$\text{Density of copper}=\frac{374.5g}{41.8cm^3}\\\\\text{Density of copper}=8.96g/cm^3$

Hence, the density of the sample of copper is $8.96g/cm^3$

For b:

Mass of ethanol = 15.0 g

Density of ethanol = 0.789 g/mL

Putting values in equation 1, we get:

$0.789g/mL=\frac{15.0g}{\text{Volume of ethanol}}\\\\\text{Volume of ethanol}=\frac{15.0g}{0.789g/mL}=19.0mL$

Hence, the volume of ethanol needed is 19.0 mL

For c:

Volume of mercury = 25.0 mL

Density of mercury = 13.6 g/mL

Putting values in equation 1, we get:

$13.6g/mL=\frac{\text{Mass of mercury}}{25.0mL}\\\\\text{Mass of mercury}=(13.6g/mL\times 25.0mL)=340.g$

Hence, the mass of mercury is 340. grams

5 0

3 years ago

How did gus get ao gay ??

Mumz [18]

Magic, that how

.....

4 0

3 years ago

The nucleus of a neutral potassium atom is "surrounded" by

ddd [48]

The answer is electron.

The nucleus of a neutral potassium atom is "surrounded" by electron.

The neutral potassium atom contains equal number of protons and neutrons, and there are 19 electrons and 19 protons while 20 neutrons.

20 protons and 20 neutrons are there in the nucleus while 19 electrons surrounds the nucleus in different orbits .

7 0

3 years ago

Read 2 more answers

NaCl is 0.85% m/v calculate molarity

skelet666 [1.2K]

Answer:

For example, 0.9% NaCl contains 0.9 g NaCl per 100 ml of solution or 9 g NaCl/l. This can be converted to molarity by dividing by molecular weight: 0.9% NaCl = (9g/l)/(58.5g/mole) = 0.15 M NaCl.

4 0

3 years ago

Which shell would be complete with 10 electrons?

nlexa [21]

Answer:

The answer to your question is letter d

Explanation:

If we remember there is a limit of electrons that can be place in a sublevel

Sublevel s only accept 2 electrons

Sublevel p only accept 6 electrons

Sublevel d only accept 10 electrons

Sublevel f only accept 14 electrons

This is in agreement wth the levels of energy, that only accept a determine number of electrons

Level Sublevel # of electrons

1 s 2

2 s and p 8 (2 + 6)

3 s, p and d 18 (2+6+10)

4 s, p, d, f 32 (2+6+10+14)

5 s, p, d,f 32 (2+6+10+14)

6 s, p, d 18 (2+6+10)

7 s, p 8 (2+6)

3 0

3 years ago