4. Consider the nuclide representations 39K and 40Ca2 Which of the following is

Question

4. Consider the nuclide representations 39K and 40Ca2 Which of the following is EALSE? (A) These have the same number of neutrons. (B) These are cations. (C) hese have the same mass. (D) 40Ca2. has more protons than 39K. (E)These have the same number of electrons. 5. Consider the chemical formula of carbon monoxide. Which of the following is EALSE? (A) It is a compound. (B) It is a molecule. (C) It is a diatomic element. (D) Each carbon monoxide is composed of two atoms. (E) When added to water, it makes a mixture.

Explanation / Answer

4. A is false because 39 is the mass number of K and 40 of the Ca2+, this number means the sum of protons and neutrons.

5.

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly less dense than air. It is toxic to hemoglobic animals (including humans) when encountered in concentrations above about 35 ppm, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal biological functions. In the atmosphere, it is spatially variable and short lived, having a role in the formation of ground-level ozone.

Carbon monoxide consists of one carbon atom and one oxygen atom, connected by a triple bond that consists of two covalent bonds as well as one dative covalent bond. It is the simplest oxocarbon and is isoelectronicwith the cyanide anion, the nitrosonium cation and molecular nitrogen. In coordination complexes the carbon monoxide ligand is called carbonyl

Compound because is made from more than one element. The smallest bit of each of these substances would be referred to as a molecule. For example, a single molecule of molecular hydrogen is made from two atoms of hydrogen while a single molecule of water is made from two atoms of hydrogen and one atom of oxygen.

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