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3 years ago

Name the following compounds:

Chemistry

1 answer:

ankoles [38]3 years ago

3 0

A) cesium chloride
B) barium oxide
C) potassium sulfide
D) beryllium chloride
E) hydrogen bromide
F) aluminum fluoride

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What may explode in a combustible atmosphere?

shusha [124]

Explanation:

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3 years ago

What is a chemical bond? Why do they form?

finlep [7]

A strong force of attraction holding atoms together in a molecule or crystal, resulting from the sharing or transfer of electrons, The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.

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3 years ago

Explain why it is important that a chemical equation be balanced

skad [1K]

In order to follow the law of conservation of mass, each side must contain an equal amount of each atom

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4 years ago

Archeologist discovered a silver crown in an ancient tomb and sent it for analysis. You placed the crown in a tub of water and f

gulaghasi [49]

Answer:

Explanation:

The density of pure lead is 10.49g/cm³

Given parameters:

Volume of water displaced by the crown = 238.1ml

Mass of crown = 2.50kg

Solution

We would simply find the density of the discovered crown and compare with that of the standardized density of lead.

Density is an intensive property of matter and it is the same for any form of matter. It is amount of substance per unit volume:

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

We need to convert the given parameters to standard unit,

1ml = 1cm³

Therefore, the volume of water displaced is 238.1cm³

Also,

1kg = 1000g

2.5kg = 2500g

mass of the crown is 2500g

Density = $\frac{2500}{238.1}$ = 10.49g/cm³

The crown is made of silver because the density matches with that of pure silver.

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3 years ago

Fires are classified into various classes and as such different types of portable fire extinguishers must be used. The theory be

Dimas [21]

Answer:

Explanation:

ABC Powder: sprays a very fine chemical powder. This acts to blanket the fire and suffocate it. Class A, B, C fires

Carbon dioxide: extinguishes CO2. By doing so, it removes oxygen from the fire, effectively suffocating it of oxygen. Class B fires

Foam: spray a type of foam that expands when it hits the air and blankets the fire. This prevents the vapors from rising off the liquid to feed the fire, thus starving it of fuel. Class A and B

Water: releases microscopic water molecules that fight the fire on a variety of levels. the level of oxygen in the air is decreased, which helps to suffocate the fire. Class: most all

also, your fire classes:

Class A: freely burning, combustible solid materials such as wood or paper

Class B: flammable liquid or gas

Class C: energized electrical fire (energized electrical source serves as the ignitor of a class A or B fire – if electrical source is removed, it is no longer a class C fire)

Class D: metallic fire (titanium, zirconium, magnesium, sodium)

Class K: cooking fires – animal or vegetable oils or fats

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3 years ago