About how many days from a full moon, a 3rd quarter moon?<br><br> A. 1<br> B. 7<br> C. 15<br> D. 30

Which trend is observed as the first four elements in group 17 on the periodic table are considered in order of increasing atomi

s344n2d4d5 [400]

ANSWER:

The melting and boiling points increase in order of increasing atomic number.

The size of the nucleus increases in order of increasing atomic number.

Ionization energy decreases in order of increasing atomic number.

Electronegativity decreases in order of increasing atomic number.

Electron Affinity decreases in order of increasing atomic number.

The reactivities decrease in order of increasing atomic number.

EXPLANATION:

NAME MELTING POINT BOILING POINT

Fluorine -220 -188

Chlorine -101 -35

Bromine -7.2 58.8

Iodine 114 184

Melting and Boiling points increase as shown above.

NAME COVALENT RADIUS IONIC RADIUS

Fluorine 71 133

Chlorine 99 181

Bromine 114 196

Iodine 133 220

Size increases as shown above.

NAME FIRST IONIZATION ENERGY

Fluorine 1681

Chlorine 1251

Bromine 1140

Iodine 1008

Ionization energy decreases as shown above.

NAME ELECTRONEGATIVITY

Fluorine 4

Chlorine 3

Bromine 2.8

Iodine 2.5

Electronegativity decreases as shown above.

NAME ELECTRON AFFINITY

Fluorine -328.0

Chlorine -349.0

Bromine -324.6

Iodine -295.2

Electron affinity decreases as shown above.

REACTIVITY

The reactivities of the halogens decrease. This is due to the fact that atomic radius increases in proportion with an increase of electronic energy levels. This decreases the pull for valence electrons of other atoms, minimizing reactivity.

6 0

3 years ago

Information presented to the public that is misleading (most often intentionally), and that is used to build or destroy support

kifflom [539]

Answer:

Propanganda

Explanation:

Propanganda can be defined as information that is often of a misleading nature. It is biased and often used to promote a political point of view.

It is the spreading of lies, half truths with the sole purpose of influencing public opinion. Propanganda works by

playing upon the fears, angers and emotions of people. It raises in people, the feelings of unpleasantness and also disgust.

8 0

3 years ago

What is the charge of the nucleus in boron

Reptile [31]

Answer:

Boron atoms lie in hexagonal aromatic graphite-like layers, with a charge of −1 on each boron atom. Magnesium (II) ions lie between layers Binary metal-boron compounds, the metal borides, contain boron in negative oxidation states. Illustrative is magnesium diboride (MgB 2).

Explanation:

8 0

3 years ago

Estimate ΔG°rxn for the following reaction at 775 K. 2Hg(g) + O2(g) → 2HgO(s) ΔH°= -304.2 kJ; ΔS° = -414.2 J/K

hichkok12 [17]

Answer:

$\Delta G^0_{rxn}=16.81kJ$

Explanation:

Hello!

In this case, since the Gibbs free energy of any process is related with the enthalpy change, temperature and entropy change as shown below:

$\Delta G^0=\Delta H^0-T\Delta S^0$

For a chemical reaction it is simply modified to:

$\Delta G^0_{rxn}=\Delta H^0_{rxn}-T\Delta S^0_{rxn}$

Thus, since the enthalpy of reaction is given as -304.2 kJ and the entropy as -414.2 J/K (-0.4142 kJ/K), at 775 K the Gibbs free energy of reaction turns out:

$\Delta G^0_{rxn}=-304kJ-775K*(-0.4142\frac{kJ}{K} )\\\\\Delta G^0_{rxn}=16.81kJ$

Whose result means this is a nonspontaneous reaction.

Best regards!

3 0

4 years ago

An object has a mass of 441 g and a volume

Ratling [72]

Answer:

<h3>The answer is 4.41 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question we have

$density = \frac{441}{10} \\$

We have the final answer as

Hope this helps you

6 0

3 years ago

About how many days from a full moon, a 3rd quarter moon? A. 1 B. 7 C. 15 D. 30