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Veronika [31]
3 years ago
6

Which of the following are true for an element?       (i)Atomic number= number of protons + number of electrons      (ii)Mass nu

mber = number of protons+ number of neutrons      (iii)Atomic mass= number of protons= number of neutrons      (iv)Atomic number = number of protons = number of electrons​
Chemistry
1 answer:
fredd [130]3 years ago
4 0

Answer:

<em>ii</em><em> </em><em>and</em><em> </em><em>iv</em><em> </em>

Explanation:

atomic mass is the sum of protons and neutrons

protons ( postively charged) usually have the same number like electrons( negatively charged)

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Which elements does sulfate ion contain?
Rom4ik [11]

Answer: Sulphur and Oxygen

Explanation: Sulphate ion is SO_4^{2-}. It is polyatomic ion which is formed by the combination of sulphur and oxygen elements in the ratio of 1:4.

It is negatively charged species and thus is named by the name _ate at the end.

It usually exists with positively charged species to get stable. eg: ferrous sulphate (FeSO_4)

4 0
3 years ago
Ptrpared a solution of sodium chloride (NaCl) by measuring out 49.Umol of sodium chloride into 150. ML. Volumetric flask and fil
ArbitrLikvidat [17]

Answer:

The answer to your question is below

Explanation:

Data

Substance = NaCl

moles of NaCl = 49

volume = 150 ml

Process

Molarity is a unit of concentration that makes a relation of the moles of a substance and the volume.

Molarity = moles / volume (L)

1.- Convert 150 ml to L

                  1000 ml ------------------ 1 L

                     150 ml -----------------  x

                      x = (150 x 1) / 1000

                      x = 0.15 L

2.- Substitution

Molarity = 49 / 0.15

Molarity = 326. 7

I have a doubt if the number of moles is 49 moles or 49μmoles            

4 0
4 years ago
HOW MANY DIFFERENT MINERALS EXIST ON EARTH?​
aliina [53]

Answer:

<h3> 4000</h3>

More than 4,000 naturally occurring minerals—inorganic solids that have a characteristic chemical composition and specific crystal structure—have been found on Earth. They are formed of simple molecules or individual elements arranged in repeating chains, sheets, or three-dimensional arrays.

6 0
3 years ago
Read 2 more answers
What mineral element present in a bridge​
OLga [1]
A mineral found in a bridge is iron
3 0
3 years ago
A metal tank containing hydrogen gas has a pressure gauge that reads 575 psi. What is causing the pressure inside of the tank?
alexandr1967 [171]

The  a metal tank containing hydrogen gas has a pressure gauge that reads 575 psi, 120  pressure inside of the tank.

What is pressure gauge?

A device used to measure a fluid's (liquid or gas') state by calculating the force the fluid would apply to a unit area if it were at rest.

What is pressure?

The force of all gas particle/wall collisions divided by the surface area of the wall is the definition of pressure (P): One of the fundamental quantifiable variables.

Therefore, a metal tank containing hydrogen gas has a pressure gauge that reads 575 psi, 120  pressure inside of the tank.

Learn more about pressure gauge from the given link.

brainly.com/question/13292088

#SPJ4

5 0
1 year ago
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