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4 years ago

Where are metalloids used in everyday life?

1 answer:

7 0

<span>Boron : It is used in many cleaning products- detergents and bleaches.
Silicon : Silicon parts are used in computers, transistors, solar cells, LCD screens and other semiconductor devices.
Germanium : Create alloys in florescent lamps,Solar Cells,LEDs and other light emitting devices
Arsenic : car batteries,added to animal food to prevent disease and to promote growth
Antimony : used in machine bearings,used in way in the production of diodes, Hall effect devices and infra-red detectors,
Tellurium : used in making ceramics, chalcogenide glasses, tinting glasses,
Polonium : Polonium is used to eliminate static electricity produced during processes such as rolling paper, wire and sheet metal.
Astatine : used as a radioactive tracer and in cancer treatment. </span>

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Reil [10]

Answer is C...... .....

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4 years ago

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Describe how a constant volume calorimeter can be used to measure the heat transferred from a burning piece of coal to cool wate

Vlad1618 [11]

Answer:

A Calorimeter is a device used to measure the amount of heat involved in a chemical or physical process.

Explanation:

Ex- when an exothermic reaction ( accompanied by or requiring absorption of heat)occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution increasing its temperature.

- When an endothermic reaction (Heat evolving reaction) occurs, the heat required is absorbed from the thermal energy of the solution, decreasing its temperature.

A burning piece of coal which is releasing heat due to its combustion and is transferred to water.

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4 years ago

When an atom of oxygen, atomic number 8, forms an ion what is the overall charge of that

lesya [120]

A. 1-

Explanation:

When an atom of oxygen with an atomic number of 8 forms an ion, the overall charge on it will be -1

When atoms from ions, they either lose or gain electrons in the process.

If an atom loses electrons, they become positively charged.

When they gain electrons, they become negatively charged.

An atom is made up of three fundamental particles;

Protons the positively charged particles

Electrons are negatively charged

Neutrons do not carry any charges.

In a neutral atom, the number of protons and electrons are the same

When an atom gains electrons, the number of electrons in it increases and it becomes negatively charged.

When they lose electrons, the number of protons is more and they become positively charged.

Oxygen atoms prefers to gain electrons in order to have a complete octet. When they gain an electron;

With the atomic number of 8:

Number of proton = 8

Number of electrons = 9

Charge = 8-9 = -1

We can represent this as O¹⁻

Ideally, oxygen prefers to gain two electrons to mimic the structure of the noble gas Neon.

Learn more:

Anions in binary compounds brainly.com/question/11041787

Anions brainly.com/question/4670413

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4 0

4 years ago

2 H2(g) + O2(g) → 2 H2O(g)

alexgriva [62]

Answer:

77 L of water can be made.

Explanation:

Molar mass of $O_{2}$ = 32 g/mol

So, 55 g of $O_{2}$ = $\frac{55}{32}$ mol of $O_{2}$ = 1.72 mol of $O_{2}$

As hydrogen is present in excess amount therefore $O_{2}$ is the limiting reagent.

According to balanced equation, 1 mol of $O_{2}$ produces 2 mol of $H_{2}O$ .

So, 1.72 mol of $O_{2}$ produce $(2\times 1.72)$ mol of $H_{2}O$ or 3.44 mol of $H_{2}O$ .

Let's assume $H_{2}O$ gas behaves ideally at STP.

Then, $P_{H_{2}O}.V_{H_{2}O}=n_{H_{2}O}.R.T$ , where P, V, n, R and T represents pressure, volume, no. of moles, gas constant and temperature in kelvin scale respectively.

At STP, pressure is 1 atm and T is 273 K.

Here, $n_{H_{2}O}$ = 3.44 mol and R = 0.0821 L.atm/(mol.K)

So, $(1atm)\times V_{H_{2}O}=(3.44mol)\times (0.0821L.atm.mol^{-1}.K^{-1})\times (273K)$

$\Rightarrow$ $V_{H_{2}O}=77L$

Option (b) is correct.

5 0

3 years ago

According to the collision theory, what two factors must be true for a given collision to successfully create products?

Rainbow [258]

Answer:

Sufficient concentration and correct orientation of particles

Explanation:

The collision theory postulates that, for a chemical reaction to occur, there must be collision between reacting particles.

It implies that the rate of reaction depends on the number of collisions per unit time as well as the fraction that are successful or effective.

For collisions to be effective, there must be proper orientation of the particles and right concentration of the reactants.

The number of effective collisions and rate of reaction are directly proportional to the concentration of of the reactants.

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3 years ago

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