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katrin2010 [14]
4 years ago
10

A 54-gram sample of an unknown material has a volume equal to 20 cm3

Chemistry
1 answer:
Vladimir [108]4 years ago
7 0
D = m/V
d = 54/20
d = 2,7 g/cm³

Could the sample be aluminum?....YES, this sample is aluminium - the density of chemical elements can be found in the periodic table.

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Please help!!!!!!!!!!
STatiana [176]
Phosphorus - P - Protons = 15, Electrons = 15, Neutrons = 16 - Non-Metal

Lithium - Li - Protons = 3, Electrons = 3, Neutrons = 4 - Metal

Nitrogen - N - Protons = 7, Electrons = 7, Neutrons = 7 - Non-Metal

Copper - Cu - Protons = 29, Electrons = 29, Neutrons = 34 - Metal

Neon - Ne - Protons = 10, Electrons = 10, Neutrons = 10 - Non-Metal

sorry i don’t know about the other questions but i thought i could help with the table!

Additional Info:

number of protons = atomic number

number of electrons = atomic number

number of neutrons = mass number - atomic number
3 0
3 years ago
What is the main function of this organ system It protects vital organs from injury. It is the first line of defense and keeps t
liraira [26]

Answer:

Organ systems & their main functions

Explanation:

The chest bones Rib Cage & spine - protects the vital organs (heart, lung,liver) from injury & provides structural support for body.

Skin is the body's first line of defense & keeps the body warm. In case of any invading infection, fever - body temperature rise fights it.

Circulatory system (containing heart) & its body fluid blood -  transports nutrients and oxygen to body cells

Endocrine system regulates growth, produces hormones - that target organs via bloodstream.

4 0
3 years ago
Define the law conservation of mass​
denis23 [38]

Answer:

Explanation:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so the quantity can neither be added nor be removed.

hope it helps

7 0
3 years ago
What is true about the element calcium(Ca, atomic number 20)? Choose all that apply.
Marat540 [252]
It has 2 valence electrons

THANK ME
7 0
4 years ago
Read 2 more answers
Which of the following elements has the smallest atomic radius?
erastova [34]

Answer:

Fluroine

Explanation:

6 0
3 years ago
Read 2 more answers
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