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Sergeeva-Olga [200]
3 years ago
11

Please help i will mark brainlist

Chemistry
2 answers:
Sphinxa [80]3 years ago
4 0

Answer:

V= 21 cubic cm (( I am not sure about density ))

Explanation:

V= L×W×H

Elan Coil [88]3 years ago
4 0

Answer:

volume = 21 cubic cm or 21 cm^3

density = 3 g/cm^3

Explanation:

volume = length × breadth × height

  • vol = 7 × 3 × 1 = 21 cubic cm

hence, volume = 21 cubic cm.

density = mass / volume

  • density = 63 / 21 = 3 g / cm^3

<em>i</em><em> </em><em>hope</em><em> </em><em>it</em><em> </em><em>helped</em><em>. </em><em>.</em><em>.</em><em>.</em>

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Compare and contrast the sizes of protons neutrons and electrons.
RideAnS [48]

Answer:

Protons and neutrons have very similar mass, while electrons are far lighter, approximately 11800 times the mass. Protons are positively charged, neutrons have no electric charge, electrons are negatively charged. The size of the charges is the same, the sign is opposite

Explanation:

8 0
4 years ago
3.Write the symbol of the element that has a charge of +1 when it has 71 electrons.​
tigry1 [53]

The symbol : \tt _{72}^{178}Hf^{+1}

<h3>Further explanation </h3>

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): <em>protons, electrons, and neutrons </em>

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

The element has 71 electrons and a charge of +1 , so

Number of protons = 71 + 1 = 72

Number of protons = the atomic number = 72

The element with atomic number 72 is Hafnium(Hf)

The atomic mass of Hf = 178 g/mol

4 0
3 years ago
I ONLY NEED 1 EXAMPLE for each one PLZ HELP ME I WILL MAKE BRAINLIST HELP ME FAST PLZ!!!! Using a skillet on the stove to cook s
d1i1m1o1n [39]

<u><em>Conduction</em></u> is your first answer. More examples are; touching a hot light bulb and walking on concrete in summer.

Your second answer is <u><em>C. Radiation</em></u>. More examples are; a sauna and a hot car motor.

Hope this helps!

⊕

6 0
3 years ago
Read 2 more answers
Chemical formula of Nascent Hydrogen is *<br>a) H2<br>b) H<br>c) HCl<br>d) HOCl​
Viktor [21]

Answer:

(a) H2

Explanation:

ok. write the answer

8 0
3 years ago
1) Look at the graph. What is the independent variable and the dependent variable?
Xelga [282]

Answer:

Independent Variable = Years

Dependent Variable = Number of Mobiles phone owners

Explanation:

Independent variables are plotted on x-axis and the dependent variables are plotted on y-axis.

In given graph the "Years" belong to x-axis hence, years are the independent variables.

Also, "Number of Mobile phones owners" belong to y-axis hence, this number is the dependent variable.

5 0
2 years ago
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