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3 years ago

Which statement explains why the melting point of perovskite is 1980°C?

Chemistry

1 answer:

Alex787 [66]3 years ago

8 0

Answer:

The melting point of perovskite is 1980°C because the electrostatic attraction between atoms holds them closely together.

Explanation:

Perovskites are materials which have the same crystal structure as calcium titanium oxide (CaTiO 3 ). Perovskites take their name from this mineral first discovered in 1839 and is named after L. A. Perovski. A general chemical formula for perovskite compounds is ABX 3 , where 'A' and 'B' are two cations of different sizes, X is an anion that bonds to both of the ions in the pervoskite material. The 'A' atoms are larger than the 'B' atoms. Pervoskite materials are ionic and ionic substances are known to have a high melting point due to very strong electrostatic interactions present in the substance. Hence its high melting point of 1980°C.

Pervoskites have many different applications in science such as lasers, photovoltaics etc.

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What happened when you add 5 ml of copper sulfate to 5 ml of calcium chloride? Does a chemical change occurs?

iragen [17]

Answer:

Yes, a chemical change occurs.

Explanation:

$CuSO_{4} + CaCl_{2} = CuCl_{2} + CaSO_{4}$

CaSO4 is insoluble in the water, so a chemical reaction or chemical change occurs.

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4 years ago

You start out with 800 moles of a radioactive substance. After 24 hours, 100 moles remain. What is the half-life of the substanc

Nookie1986 [14]

The half life of the substance is 8 hours , Option D is the correct answer.

What is Half Life ?

Half-life is the time required by an unstable element to reduce to half of its initial value.

The term is commonly used in nuclear physics.

The formula is

$\rm N(t) = \; N_{0} \;(\dfrac{1}{2} )^{\frac{t}{t_{1/2} } }$

N(t) = quantity of the substance remaining

N ₀ = initial quantity of the substance

t = time elapsed

$\rm t_{1/2}$ = half life of the substance

The data given in the question is N ₀ = 800 moles , N(t)= 100 , t= 24 hours

$\rm t_{1/2} =\; ?$

Substituting values in the equation

$\rm 100 = \; 800 \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }$

$\rm \dfrac{100}{800} = \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }\\\\\rm \dfrac{1}{8} = \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }\\\\\rm (\dfrac{1}{2})^{3} = \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }\\\\\rm 3=\dfrac{24}{t_{1/2} }\\\\t_{1/2}= \dfrac{24}{3}\\\\t_{1/2} = 8 hours$

Therefore half life of the substance is 8 hours , Option D is the correct answer.

To know more about Half Life

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2 years ago

A chemical that will ignite spontaneously in air at a temperature of 130 degree fahrenheit (54.4 degree celsius) or below is ide

MrRissso [65]

Hello!

<span>A chemical that will ignite spontaneously in air at a temperature of 130 degree fahrenheit (54.4 degree celsius) or below is identified by the term pyrophoric.

Pyrophoric substances are those that ignite spontaneously when in contact with air at 130 °F or below. Some substances that are pyrophoric include Iron Sulfur (FeS) or some metals like finely powdered Uranium. To handle pyrophoric substances, it is required to work in an inert atmosphere (i.e. an atmosphere without oxygen).

Have a nice day!</span>

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3 years ago

What did Rutherford's gold-foil experiment help him conclude?

Svetach [21]

C. mass is protons and neutrons. Both are in the nucleus

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3 years ago

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Write balanced complete ionic equation for the reaction AgNO3(aq)+KCl(aq)→AgCl(s)+KNO3(aq).

Nikitich [7]

AgNO3(aq) + KCl (aq)-----> AgCl(s) + KNO3(aq)

Ag ^+(aq) + NO3^-(aq) + K^+ (aq) + cl^- (aq) ----> AgCl(s) + K^+(aq) + NO3^-(aq)

net ionic equation
Ag ^+(aq) + Cl^-(aq) ----> AgCl(s)

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3 years ago

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