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3 years ago

Please help me with questions 43, 44, and 45

Chemistry

1 answer:

ohaa [14]3 years ago

6 0

Im que se puede encontrar un segundo lugar en a las que se puede hacer un trabajo en la it was correct but i said that he would not answer the answer

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The melting point of the metal potassium is 63.5c, while that of titanium is 1660c. what explanation can be given for this great

kiruha [24]

The melting point of potassium = $63.5^{0}C$

Melting point of titanium = $1660^{0}C$

Titanium has a stronger metallic bonding compared to potassium. Titanium being a transition metal has greater number of valence electrons (4 valence electrons) contributing to the valence electron sea compared to potassium which has only one valence electron. The atomic size of Titanium much lower than that of potassium, so the bonding between Titanium atoms is stronger than that of potassium. Hence, the melting point of Titanium is much higher than that of potassium.

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3 years ago

What can be concluded about the atom from knowing that oxygen 18 has an atomic number of 8?

Vinvika [58]

<span>The atomic number of a neutral atom is equal to the number of protons and the number of electrons of the atom. The atomic weight meanwhile is equal to the sum of the number of protons and number of neutrons.Hence we can say that the number of protons is 8 and the number of neutrons is 10. </span>

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3 years ago

Read 2 more answers

Which of the following combinations will result in a reaction that is spontaneous at all temperatures?

Katen [24]

Answer:

$\huge\boxed{Option \ 2}$

Explanation:

A reaction is spontaneous at all temperatures by the following combinations:

=> A negative enthalpy change ( $\triangle H < 0$ )

=> A positive entropy change ( $\triangle S > 0$ )

See the attached file for more better understanding!

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3 years ago

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A 35.6 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter, according to the following reaction. If the temperature ros

Oksana_A [137]

<h3>Answer:</h3>

A) -1.24 × 10^3 kJ/Mol

<h3>Explanation:</h3>

we are given;

Mass of ethanol, m = 35.6 g

Temperature change, Δt(35.0 to 76.0°C) = 41 °C

Specific heat capacity of the calorimeter, c = 23.3 kJ/°C

Molar mass of ethanol = 46.07 g/mol

We are required to the heat change of the reaction.

We need to note that the reaction is an exothermic reaction since there is an increase in temperature which means heat was lost to the surroundings.

Therefore; we are going to use the following steps;

<h3>Step 1 : Moles of ethanol </h3>

We know, Moles = Mass ÷ molar mass

Thus, moles of ethanol = 35.6 g ÷ 46.07 g/mol

= 0.773 moles

<h3>Step 2: Enthalpy change or heat change for the reaction.</h3>

Heat change = -mcΔt

but we are given s[pecific heat capacity in Kj/°C and we require heat change in kJ/mol

Therefore;

Heat change = -(cΔt) ÷ n ( n is the number of moles)

= -( 23.3 kJ/°C × 41°C) ÷0.773 mol

= - 1.24 × 10^3 kJ/Mol

Therefore, values of ΔH of the reaction is -1.24 × 10^3 kJ/Mol

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3 years ago

What is the temperature at which something boils? A chemical change or property or a physical change or property?

DerKrebs [107]

The boiling point of a substance is a physical property. A physical property of a material or substance is one that can be observed without changing or altering the composition of the material. Examples are mass, Density, Color, solubility, boiling point, melting point . A chemical property of a substance is one that describes how the material changes into a completely different substance and is observed only during a chemical reaction. Examples of chemical properties include types of chemical bonds, heat of combustion, reactivity with other metals, oxidation state and enthalpy of formation.

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3 years ago