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3 years ago

How do valence electrons affect the properties of atoms?

1 answer:

6 0

It determines the manner in which it develops bonds.... so, it affect ionization energy, electronegativity, metallic characteristic, formation of oxides etc.

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Maslowich

Nebula : a large cloud of gas and dust in interstellar space; a region in space where stars are born

8 0

3 years ago

When should a line graph be used

olga_2 [115]

Answer:

<em>Line graphs are used to track changes over short and long periods of time. When smaller changes exist, line graphs are better to use than bar graphs. Line graphs can also be used to compare changes over the same period of time for more than one group.</em>

6 0

3 years ago

KNO3(s) --> K+(aq) + NO3-(aq)This reaction was carried out in a Styrofoam insulated calorimeter and the following data were r

nataly862011 [7]

Answer:

Equation correctly showing the heat of solution

$KNO_3(s)+35.2 kJ \rightarrow K^+(aq) + NO_{3}^-(aq)$

Explanation:

Mass of aqueous solution = m = 100 g

Specific heat of solution = c = 4.18 J/gºC

Change in temperature = $\Delta T=T_f-T_i$

ΔT = 21.6ºC - 30.0ºC = -8.4ºC

Heat lost by the solution = Q

$Q = mc\Delta T$

$Q=100 g\times 4.18 J/g^oC\times (-8.4^oC)$

Q = -3,511.2 J ≈ -3.51 kJ

Heat absorbed by potassium nitrate when solution in formed; Q'

Q' = -Q = 3.51 kJ

Moles of potassium nitrate , n= $\frac{10.1 g}{101 g/mol}=0.1 mol$

$KNO_3(s)\rightarrow K^+(aq) + NO_{3}^-(aq)$

The heat of solution =

$\frac{Q'}{n}=\frac{3.5112 kJ}{0.1 mol}=35.1 kJ/mol$

So, the equation correctly showing the heat of solution

$KNO_3(s)+35.2 kJ \rightarrow K^+(aq) + NO_{3}^-(aq)$

4 0

3 years ago

Which spheres are part of the earth system

zubka84 [21]

Answer:

Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).

Explanation:

8 0

3 years ago

A change involving whole atoms is called _____.

givi [52]

Answer is: chemical.

If the arrangement of particles is changed, that is chemical change or chemical reaction (new substance is formed).

In physical change, the bonds between oxygen and hydrogen can not be separated.

For example, balanced chemical reaction: 2Mg(s) + O₂(g) → 2MgO(s).

Chemical changes (chemical synthesis) is when a substance combines with another (in this example magnesium and oxygen) to form a new substance.

5 0

3 years ago