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3 years ago

What statement is true about the eight elements on the periodic table termed metalloids?

Chemistry

2 answers:

yKpoI14uk [10]3 years ago

7 0

Answer: Option (B) is the correct answer.

Explanation:

Metalloids are the substances which show properties of both metals and non-metals.

Metalloids are moderately able to conduct heat and electricity. And, generally metalloids are solid at room temperature.

They are also able to react with other molecules like metals.

For example, boron, silicon, germanium etc are metalloids.

All of them contains different number of protons and neutrons.

Metals are good conductors of heat ant electricity and generally they are solid at room temperature. Metals have a shiny surface and they are also malleable and ductile.

On the other hand, non-metals are bad conductors of heat and electricity. They are brittle and non-shiny in nature.

Thus, we can conclude that the statement they have properties of both metals and nonmetals.

Mashutka [201]3 years ago

4 0

Answer:

See Explanation

Explanation:

The answer would be B), because we know the other answers are just plain incorrect.

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3 years ago

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Determine the mass of each sample 1.55 kmol sulfur trioxide

xxMikexx [17]

Explanation:

Given parameters:

Number of moles of the sulfur trioxide = 1.55kmol = 1.55 x 10³mole

Unknown:

Mass of the sulfur trioxide = ?

Solution:

To solve for the mass of the sample of sulfur trioxide:

Find the molar mass of the compound i.e SO₃

atomic mass of S = 32g

O = 16g

molar mass = 32 + 3(16) = 80g/mol

Use the formula below:

mass of SO₃ = number of moles x molar mass

mass of SO₃ = 1.55 x 10³ x 80 = 124000g or 124kg

Learn more:

mole calculation brainly.com/question/13064292

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3 years ago

When unbalanced forces act on an object that is in motion, the object can:

AlekseyPX

Answer:

A. change speed, direction, or both

Explanation:

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5 0

3 years ago

Which of the reactions are exothermic?

Nutka1998 [239]

Answer:

Reaction A, B, E and F are exothermic reactions.

Explanation:

Exothermic reactions are defined as the reactions in which energy of reactants is more than the energy of the products. In these reactions, energy is released by the system.

The total enthalpy of the reaction $(\Delta H)$ comes out to be negative.

Endothermic reactions are defined as the reactions in which energy of products is more than the energy of the reactants. In these reactions, energy is absorbed by the system.

The total enthalpy of the reaction $(\Delta H)$ comes out to be positive.

So, from the given option reaction which are exothermic are with negative value $(\Delta H)$ that enthalpy of reaction and those are:

1) $2Mg(s) + O_2( g )\rightarrow 2MgO (s)$ ,ΔH = -1203 kJ/mol