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jok3333 [9.3K]
3 years ago
8

All atoms of an element always have the same number of question 4 options: electrons protons electrons neutrons save

Chemistry
1 answer:
gizmo_the_mogwai [7]3 years ago
7 0
All atoms of an element always have the same number of protons (the positively charged subatomic particle).

Isotopes of the element differ in the mass which means that they differ in the number of the neutrons (which are the subatomic particles having no charge).

At neutral state only will the number of protons be equal to the number of electrons in an atom.
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Homework 1
Bond [772]

Answer:

average for silk =141"

average for cotton =96"

average for nylon = 70"

if you desire a slower falling parachute to protect the body from damage,

silk is the best

if you desire a faster falling parachute to escape enemy bullets,

nylon is the best

Explanation:

Homework 1

Problem Solving

1. Kelvin and Xavier were doing an investigation on parachutes. One of them suggested that the type of material the parachute was made from had an effect on how long it took to reach the ground. Their results are given in

the table below.

(a) Calculate the average time in seconds for each material.

Time taken for parachute to reach the ground (seconds)

MATERIAL

1st TRY

2nd TRY

3rd TRY

AVERAGE

Sik

144

140  average of 3 = 141

139

Cotton

98

96   average of 3  = 96

94

Nylon

72

68    average of 3 = 70

70

5 0
2 years ago
How many formula units of CaO are in 32.7 g of CaO?
max2010maxim [7]

Answer:

3.51× 10²³ formula units

Explanation:

Given data:

Mass of CaO = 32.7 g

Number of formula units = ?

Solution:

First of all we will calculate the number of moles.

Number of moles = mass/molar mass

Number of moles = 32.7 g/ 56.1 g/mol

Number of moles = 0.583 mol

Number of formula units:

1 mole = 6.022 × 10²³ formula units

0.583 mol ×  6.022 × 10²³ formula units / 1 mol

3.51× 10²³ formula units

The number 6.022 × 10²³ is called Avogadro number.

7 0
3 years ago
What coefficient of h+ balances the atoms in this half-reaction h+ + mno2 → mn2+ + h2o?
kvv77 [185]
The answer is 4 im pretty sure 
7 0
3 years ago
Read 2 more answers
Can you guys help me with 8&9 THANK YOUU
zlopas [31]
number 8 the list is hydrogen,magnesium,silicon and oxygen and there are 4elements
8 0
3 years ago
Please help this is my chemistry work
Alja [10]
It’s deceleration hope that helps!
5 0
3 years ago
Read 2 more answers
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