A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?

Answers

Answer 1

Answer: Specific heat capacity is the required amount of heat per unit of mass in order to raise teh temperature by one degree Celsius. It can be calculated from this equation: H = mCΔT where the H is heat required, m is mass of the substance, ΔT is the change in temperature, and C is the specific heat capacity.

H = mCΔT
2501.0 = 0.158 (C) (61.0 - 32.0)

C = 545.8 J/kg·°C

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Which statement best describes why carbon can form a wide variety of organic compounds?Each carbon atom ionically bonds with atoms of carbon, hydrogen, oxygen, and nitrogen.

Each carbon atom covalently bonds with atoms of carbon, hydrogen, oxygen, and nitrogen.

Each carbon atom ionically bonds with atoms of oxygen and nitrogen.

Each carbon atom covalently bonds with atoms of oxygen and nitrogen.

Answers

Carbon can form a wide variety of organic compounds because:

Each carbon atom covalently bonds with toms of carbon, hydrogen oxygen, and nitrogen

A carbon atom can have 4 single valence electrons around it. This allows it to form covalent bonds with many different atoms.

Each carbon atom covalently bonds with atoms of carbon, hydrogen, oxygen, and nitrogen describes why carbon can form a wide variety of organic compounds. thus, option B is correct.

What is valency?

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

Carbon can form a wide variety of organic compounds because Each carbon atom covalently bonds with atoms of carbon, hydrogen oxygen, and nitrogen. a carbon atom can have 4 single valence electrons around it. This allows it to form covalent bonds with many different atoms.

Learn more about the valency of carbon here:

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What unit is used to measure weighted average atomic mass?a. amu
b. gram
c. angstrom
d. nanogram

Answers

The unit used to measure weighted average atomic mass is he dalton or amu. So A. Hope this helped :D

A. Amu
Stands for atomic mass unit.

How would a solution that is labeled 5.0 molar be similar to one labeled 5.0 molal?

Answers

They might share some similarities but definitely they do not mean the same. Both are expressions of concentration of a substance. Molarity is the number of moles per unit of volume of the solution while molality is the number of moles per mass of solvent. In this case, they both are similar in having 5 moles of the substance.

Which statement best explains the role of acatalyst in a chemical reaction?
(1) A catalyst is added as an additional reactant
and is consumed but not regenerated.
(2) A catalyst limits the amount of reactants used.
(3) A catalyst changes the kinds of products produced.
(4) A catalyst provides an alternate reaction pathway
that requires less activation energy.

Answers

The answer is (4). If you look at a Maxwell-Boltzmann energy curve, you will see that lowering the activation energy will increase the proportion of molecules with sufficient energy for a successful reaction collision. Therefore, a reaction with lower activation energy will proceed more quickly. Often, this lower activation energy is obtained by another mechanistic pathway. Catalysts increase reaction speed through these two basic mechanisms.

Concentrated nitric acid used in laboratory is 68 % nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL-1?

Answers

68% by mass = 68 / 100 => 0.68

Density = 1.504 g/mL⁻¹

Molar mass HNO₃ =63.01 g/mol

M = 1000 * T* D / mm

M = 1000 * 0.68 * 1.504 / 63.01

M = 1022.72 / 63.01

M = 16.23 mol/L

hope this helps!

What is it called when elements combine to form a chemical compound?

Answers

Explanation:

A compound is a unique substance that forms when two or more elements combine chemically.
Compounds form as a result of chemical reactions. The elements in compounds are held together by chemical bonds.
A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons.

hope it helpful ✌️✌️

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