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3 years ago

Where might you find products made from polystyrene

1 answer:

6 0

It can be cast into moulds with fine detail, for example yogurt cups, plastic cutlery and CD and DVD cases. Polystyrene can be transparent or can be made to take on various colours. Products made from foamed polystyrene are nearly everywhere, for example packing materials, insulation, and foam beverage cups.

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The Lewis dot model of a metal atom has two dots. Which of the following is true about the atom?

nataly862011 [7]

Answer : the statement that is true about the atom is It is present in the second group of the periodic table.

Explanation :

The Lewis dot model shows the number of valence electrons present in the atom.

Since the given metal has 2 dots, it indicates that the metal atom must have 2 electrons in its outermost shell.

Therefore option 2 : It has two electrons in the innermost energy level, is wrong because it contains 2 electrons in the outermost energy level

Option 1 : It is most likely to form covalent bonds is also wrong because a metal atom always forms ionic bond

Option 3 : It requires six other atoms to form a stable compound, is also wrong as the metal can form a stable compound by donating its 2 electrons to a non metal.

On periodic table, representative elements are arranged in groups based on their valence electrons. Therefore by knowing the outermost electrons, we can predict the group in which the element can be categorized.

Since the given metal atom contains 2 electrons, it must be present is second group.

Therefore the statement that is true about the atom is It is present in the second group of the periodic table.

6 0

3 years ago

Find the mass of an object that has a volume of 6.0 cm ³ and density of 3.3 g / ml.

wel

Answer:

<h3>The answer is 19.8 g</h3>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume = 6 cm³

density = 3.3 g/cm³

We have

mass = 3.3 × 6

We have the final answer as

Hope this helps you

4 0

3 years ago

What can most likely be concluded about these substances

TiliK225 [7]

yay what what substances

7 0

3 years ago

A teacher asks students to make a model of a transform plate boundary. The

N76 [4]

Answer:

C Earthquake

Explanation:

I just took this test and it’s on Quizizz

8 0

2 years ago

Read 2 more answers

Which one of the following substances has three unpaired d electrons? A) [V(H2O)6]4+ B) [Zn(NH3)4]2+ C) [Cu(NH3)4]2+D) [Ag(NH3)2

Volgvan

Answer:

The correct option is: E) [Cr(CN)₆]³⁻

Reason: In this complex, Cr is present in +3 oxidation state and the electron configuration of Cr³⁺ is [Ar] 3d³

Therefore, the number of unpaired electrons = 3

Explanation:

A) [V(H₂O)₆]⁴⁺

Central metal: Vanadium (V)

Let the oxidation state of V be x

Oxidation state of H₂O = 0

x + 6 × (0) = +4

x = +4

Ground state electron configuration: V = [Ar] 3d³4s²

Excited state electron configuration: V⁴⁺ = [Ar] 3d¹

<u><em>Therefore, the number of unpaired electrons = 1</em></u>

B) [Zn(NH₃)₄]²⁺

Central metal: Zinc (Zn)

Let the oxidation state of Zn be x

Oxidation state of NH₃ = 0

x + 4 × (0) = +2

x = +2

Ground state electron configuration: Zn = [Ar] 3d¹⁰4s²

Excited state electron configuration: Zn²⁺ = [Ar] 3d¹⁰

<u><em>Therefore, the number of unpaired electrons = 0</em></u>

C) [Cu(NH₃)₄]²⁺

Central metal: Copper (Cu)

Let the oxidation state of Cu be x

Oxidation state of NH₃ = 0

x + 4 × (0) = +2

x = +2

Ground state electron configuration: Cu = [Ar] 3d¹⁰4s¹

Excited state electron configuration: Cu²⁺ = [Ar] 3d⁹

<u><em>Therefore, the number of unpaired electrons = 1</em></u>

D) [Ag(NH₃)₂]⁺

Central metal: Silver (Ag)

Let the oxidation state of Ag be x

Oxidation state of NH₃ = 0

x + 2 × (0) = +1

x = +1

Ground state electron configuration: Ag = [Ar] 4d¹⁰5s¹

Excited state electron configuration: Ag⁺ = [Ar] 4d¹⁰

<u><em>Therefore, the number of unpaired electrons = 0</em></u>

E) [Cr(CN)₆]³⁻

Central metal: Chromium (Cr)

Let the oxidation state of Cr be x

Oxidation state of CN⁻ = -1

x + 6 × (-1) = -3

x = +3

Ground state electron configuration: Cr = [Ar] 3d⁵ 4s¹

Excited state electron configuration: Cr³⁺ = [Ar] 3d³

<u><em>Therefore, the number of unpaired electrons = 3</em></u>

7 0

3 years ago