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lions [1.4K]
3 years ago
11

Which of the following is a trend in the periodic table from top to bottom?

Chemistry
2 answers:
Feliz [49]3 years ago
4 0

Answer:

Number of neutrons -

because the proton number increases as you go down the group so the number of neutrons does do.

You can have 87 protons and just 8 neutrons

Explanation:

Shtirlitz [24]3 years ago
3 0
Number of neotrons because it is
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La formula quimica de la molecula de agua H20 , si H = 1 gramos y O = 16 gramos . Cual es su composicion porcentual ? 88,88 % de
vesna_86 [32]

Answer:

88,88 % de O y 11,11 % de H

Explanation:

La composición porcentual se define como la masa que hay de cada mol de átomo en 100g. Las moles de agua en 100g son:

<em>Masa molar agua:</em>

2H = 2*1g/mol = 2g/mol

1O = 1*16g/mol = 16g/mol

Masa molar = 2 + 16 = 18g/mol

100g H2O * (1mol / 18g) = 5.556 moles H2O.

Moles de hidrógeno:

5.556 moles H2O * (2mol H / 1mol H2O) = 11.11 moles H

Moles Oxígeno = Moles H2O = 5.556 moles

La masa de hidrógeno es:

11.11mol * (1g/mol) 11.11g H

La masa de oxígeno es:

5.556 mol * (16g / 1mol) = 88.89g O

Así, el porcentaje de O es 88.89% y el de H es 11.11%. La opción correcta es:

<h3>88,88 % de O y 11,11 % de H</h3>
7 0
2 years ago
BRAINLIEST ANSWER! An Earth-like planet is 500 light years away. Why is this an obstacle for a manned space mission?
Over [174]
C sounds correct........
5 0
3 years ago
Read 2 more answers
(I NEED THIS ANSWERED QUICKLY! I WILL GIVE BRAINLIEST IF YOU'RE ANSWER IS CORRECT! AND MAYBE EXTRA POINTS!)
MrRissso [65]

Answer:

C: object does not slide off the pan

Explanation:

6 0
2 years ago
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When the body becomes overheated, how does the body react to maintain homeostasis?
erastovalidia [21]

Answer:

Nervous system directs your body to swear to release heat.

Explanation:

Sweat maintains homeostasis when overheating.

4 0
2 years ago
A boy of mass 60 kg and a girl of mass 40 kg are together and at rest on a frozen pond. What is the initial momentum of the boy?
Marianna [84]

The initial momentum of the boy is 0 kgm/s the right option is A. 0 kgm/s.

<h3>What is momentum?</h3>

Momentum can be defined as the product of mass and velocity. The S.I unit of momentum is kgm/s.

The initial momentum of the boy can be calculated using the formula below.

Formula:

  • M' = mu

Where:

  • M = Initial momentum of the boy

From the question,

Given:

  • M = mass of the boy = 60 kg
  • U = Initial velocity of the boy = 0 m/s (at rest)

Substitute these values into equation 1

  • M = 60(0)
  • M = 0 kgm/s

Hence, The initial momentum of the boy is 0 kgm/s the right option is A. 0 kgm/s.
Learn more about momentum here: brainly.com/question/7538238

8 0
2 years ago
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