All categories

4 years ago

How are the elements within a row different?

Chemistry

2 answers:

NikAS [45]4 years ago

6 0

Answer:

answer is b

Explanation:

All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor

Makovka662 [10]4 years ago

3 0

Answer:

It’s A they have different number of balance electrons

Explanation:

You might be interested in

List two sources from which Earth receives its energy.

nignag [31]

Geothermal (volcanoes and heat sources from the earth) and solar

7 0

3 years ago

When 86.5 g of calcium chlorate decomposes into calcium chloride and oxygen, how many grams of oxygen are produced? Ca(ClO3)2 →

natita [175]

Answer:

40.1 g

Explanation:

The balanced equation is:

Ca(ClO₃)₂ → CaCl₂ + 3O₂

First we convert 86.5 g of calcium chlorate into moles, using its molar mass:

86.5 g Ca(ClO₃)₂ ÷ 206.98 g/mol = 0.418 mol Ca(ClO₃)₂

Then we convert Ca(ClO₃)₂ moles into O₂ moles, using the stoichiometric coefficients of the balanced reaction:

0.418 mol Ca(ClO₃)₂ * $\frac{3molO_2}{1molCa(ClO_3)_2}$ = 1.254 mol O₂

Finally we convert O₂ moles into grams:

1.25 mol O₂ * 32 g/mol = 40.1 g O₂

8 0

3 years ago

How many significant figures does 546.000 have

choli [55]

This has only only three sig figs because it is 546.000 the zeros are just place holders so thus meaning they are not significant. It is just another way to write 546 because in that number there is also 3 sig figs. They are just trying to throw you off. Just watch out because if the example is 540 then it is just two significant digits, and it were to be 540. then it be three cause that "." makes the zero significant.

7 0

3 years ago

A 100.0 ml sample of 0.18 m hclo4 is titrated with 0.27 m lioh. determine the ph of the solution after the addition of 100.0 ml

Naddika [18.5K]

(I think you have a mistake in your question as the addition is 30mL, not 100mL)
when PH = - ㏒[H+]
and here we have HClO4 is the strong acid
So PH = - ㏒[HClO4]

moles of HClO4 = 0.1 L *0.18 m = 0.018 M
moles of LiOH = 0.03 L * 0.27 m = 0.0081 M
when the total volume = 0.1L + 0.03L = 0.13 L
∴ [HClO4] = (0.018-0.0081)/0.13 L
= 0.076 M
PH = -㏒ 0.076
= 1.12

5 0

4 years ago

Read 2 more answers

Which Group 15 element exists as diatomic molecules at STP?

ikadub [295]

Answer: The correct option is 2.

Explanation: Group 15 elements are Nitrogen, phosphorous, Arsenic, Antimony, Bismuth.

To know whether an element exits as a diatomic molecule or not, we look at the atomicity of an element.

Atomicity is the number of atoms of an element combining to form a molecule.

Atomicity of Nitrogen = 2

Atomicity of Phosphorous = 4

Atomicity of Bismuth = 1