The person whose work led to a periodic table based on increasing atomic number was

Answers

Answer 1

Answer:

The person whose work led to a periodic table based on increasing atomic number was Henry Moseley.

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What is a light-year? A.
the distance light travels in one earth year

B.
the distance light travels from the sun to the earth

C.
the distance light travels in one orbit of the moon

D.
the time it takes light to travel across the universe

Answers

The answer would be A. The distance light travels in one earth year.

i think it is B the distance light travels from the sun to the earth

Cu + AgNO3 = Cu(NO3)2 +Ag

Answers

The problem is that you have to balance Cu + AgNO3 = Cu(NO3)2 + Ag

The first step is to identify all the elements and how many atoms of that element there are on either side of the equals sign.
When you do this you will get,

1 Cu 1
1 Ag 1
1 N 2
3 O 6

Next step is to make sure that all the elements are the same on both sides. This is mostly trial and error until you balance both sides.

The solution to the equation would be:

Cu + 2AgNO3 = Cu(NO3)2 + 2Ag

So now if you check your elements, you will get the following:

1 Cu 1
2 Ag 2
2 N 2
6 O 6

As you can see all the elements are equal on both sides, so the equation is balanced.

How do u separate salt from rock salt?

Answers

In order to separate salt from rock salt, first crush the salt rock into small pieces, put it in a container and add water. Stir until it dissolves. Pour the solution to a funnel lined with coffee filter. Heat the filtered water and the water will evaporate leaving salt behind.

Please help!will give brainiliest

Answers

Answer:

nuetrons

Explanation:

some helium atoms just a little thick and packing extra neutrons

Neutrons is the correct answer

What property of nonmetals can be determined using a flashlight?

Answers

Light shining through the less dense material.

8. What is the heat of reaction when hydrogen and oxygen combine to form water?2H2(g) + O2(g) → 2H2O(1)
(AHC H20(I) = -285.8 kJ/mol)
A -120.9 kJ
B-241.8 kJ
C-571.6 kJ
D-285.8 kJ

Answers

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

C. 571.6 kJ

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

$2H_(2)(g)+O_(2)\rightarrow 2H_(2)(l)$

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

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