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3 years ago

1.* Write the name and symbol of the ion formed when

Chemistry

2 answers:

BartSMP [9]3 years ago

7 0

Answer:

Explanation:

a. When a sulphur atom gains two electrons, it becomes negatively charged to form an anion called sulphide ion and it’s represented as S2-.

b. When an aluminium atom loses three electrons, it becomes positively charged to form a cation and it is represented as Al3+.

c. When a nitrogen atom gains three electrons, it becomes negatively charged to form an anion called nitride ion and it is represented as N3-.

d. When a calcium atom loses two electrons, it becomes positively charged to form a cation and it is represented as Ca2+

• When Iron (Fe) loses two electrons, it becomes Fe2+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d6

• When Cobalt (Co) loses two electrons, it becomes Co2+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d7

• When Nickel (Ni) loses two electrons, it becomes Ni2+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d8

•When Chromium (Cr) loses three electrons, it becomes Cr3+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d3

• When Manganese (Mn) loses three electrons, it becomes Mn3+ and the electronic configuration will be 1S2 2S2 2P6 3S2 3P6 3d4

•Bromine (Br) gains an electron to become Br-

•Hydrogen (H) gains an electron to become H-

•Arsenic (As) gains three electrons to become As3-

•Selenium (Se) gains two electrons to become Se2-

wlad13 [49]3 years ago

6 0

1a) anion and S-2
1b) cation and Al+3
1c) anion and N-3
1d) cation and Ca+2

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Aluminum foil is often incorrectly termed tin foil. If the density of tin is 7.28g/cm³,what is the thickness of a piece of tin f

leonid [27]

Answer:

15.0 µm

Step-by-step explanation:

Density = mass/volume

D = m/V Multiply each side by V

DV = m Divide each side by D

V = m/D

Data:

m = 1.091 g

D = 7.28 g/cm³

l = 10.0 cm

w = 10.0 cm

Calculation:

(a) Volume of foil

V = 1.091 g × (1 cm³/7.28 g)

= 0.1499 cm³

(b) Thickness of foil

The foil is a rectangular solid.

V = lwh Divide each side by lw

h = V/(lw)

= 0.1499/(10 × 10)

= 1.50 × 10⁻³ cm Convert to millimetres

= 0.015 mm Convert to micrometres

= 15.0 µm

The foil is 15.0 µm thick.

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3 years ago

How much positive charge is in 0.7 kg of lithium? with each atom having 3 protons and 3 electrons. The elemental charge is 1.602

hichkok12 [17]

Explanation:

As a neutral lithium atom contains 3 protons and its elemental charge is given as $1.602 \times 10^{-19} C$ . Hence, we will calculate its number of moles as follows.

Moles = $\frac{mass}{\text{molar mass}}$

= $\frac{0.7 \times 1000 g}{7 g/mol}$

= 100 mol

According to mole concept, there are $6.023 \times 10^{23}$ atoms present in 1 mole. So, in 100 mol we will calculate the number of atoms as follows.

No. of atoms = $100 \times 6.023 \times 10^{23}$

= $6.023 \times 10^{25}$ atoms

Since, it is given that charge on 1 atom is as follows.

$3 \times 1.602 \times 10^{-19}C$

= $4.806 \times 10^{-19}C$

Therefore, charge present on $6.023 \times 10^{25}$ atoms will be calculated as follows.

$6.023 \times 10^{25} atoms \times 4.806 \times 10^{-19} C$

$28.95 \times 10^{6}C$

Thus, we can conclude that a positive charge of $28.95 \times 10^{6}C$ is in 0.7 kg of lithium.

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3 years ago

- Explain how ionic bonds, covalent bonds, and metallic bonds each form and how.

-Dominant- [34]

Answer: -Ionic bonds form when one atom provides electrons to another atom. Covalent Bonds: Covalent bonds form when two atom shares their valence electrons. Metallic Bonds: Metallic bonds form when a variable number of atoms share a variable number of electrons in a metal lattice.

-Covalent Bonds.

Covalent Compounds. Contain no metals and no ions. Covalent compounds contain nonmetals only.

Example:

Ionic Compounds. A metal with a non-metal. Doesn't use prefixes for naming. Name the metal and change the nonmetal ending to -ide.

Explanation: Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

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2 years ago

1. Chemical equilibrium is established when the number of reactants equals the number of products.. . - True. - False. . 2. Acco

torisob [31]

1)false a in chemical equilibrium concentration of reactant is equal to concentration of product
2)as here they said heat is added in product side means its endothermic reaction and in endothermic reaction on increasing temp. equilibrium shift towards forward direction so its true
3) B)as here mole are equal in reactant and product side that is 2 and if we increase pressure equilibrium shift in dat direction where no. of moles are less and here mole are equal so it will remain unaffected

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3 years ago

Read 2 more answers

A 5.0 milliliter sample of a substance has a mass of 12.5 grams. What is the mass of a 100 milliliter sample of the same substan

exis [7]

Answer:

It sould be 250 grams

Explanation:

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3 years ago