an atom (to form cations) or adding electrons (to form anions). Ions are never formed by1. It is important to recognize that ions are always formed by removing electrons froma. There must be both positive ions (cations) and negative ions (anions) present.2. It is very important to remember that a chemical compound must have a net chargeRead the following sentences.changing the number of protons in an atom's nucleus.of zero. This means that if a compound contains ions, thena

electrically neutral: A net charge of zero, which occurs when an atom or molecule/compound has no…

Answered: an atom (to form cations) or adding…

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter2: Life's Chemical Basis

Section: Chapter Questions

Problem 15SQ

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Atoms share electrons unequally in a(n) ________ bond. a. ionic b. hydrogen c. polar covalent d. nonpolar covalent
Which of the following is a molecule, but not a compound? a. H2O b. 2H c. H2 d. H+
Each carbon atom can bond with as many as _________ other atoms.
A substance formed of crystals of equal numbers of cations and anions held together by ionic bonds is called a(n) ________. noble gas salt electrolyte dipole
Figure 2.12 A pH scale. Here, red dots signify hydrogen ions (H+) and blue dots signify hydroxyl ions (OH). Also shown are the approximate pH values for some common solutions. This pH scale ranges from 0 (most acidic) to 14 (most basic). A change of one unit on the scale corresponds to a tenfold change in the amount of H+ ions. Photos, JupiterImages Corporation. Figure It Out: What is the approximate pH of cola?
Nitrogen has an atomic number of seven. How many electron shells does it likely have? one two three four
Polonium is a rare element with 33 radioisotopes. The most common one, P210o, has 84 protons and 126 neutrons. When P210o decays, it emits an alpha particle, which is a helium nucleus 2 protons and 2 neutrons. P210o decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. For example, they can be stopped by a single sheet of paper or a few inches of air. That is one reason why authorities failed to discover toxic amounts of P210o in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of P210o change into after it emits an alpha particle.
All ions have at least one ________ select all that are correct. a. proton c. electron b. neutron d. all of the above
Letter only, no need to explain. 1. These are molecules composed of hydrogen, carbon and oxygen, with no 2:1 ratio of hydrogen to oxygen. A. Lipids B. Carbohydrates C. Proteins D. Nucleic acids 2. The following statement are true about water EXCEPT: A.Water is a polar substance. B.Water will dissolve non-polar substances C.Water forms hydration shells around certain ions D.The capacity of water to dissolve many substances comes from its dipolar nature. 3. If a compound dissociates into H+ and a negative ion, it is a? A. acid B. base C. salt D. neutral compound 4. The following are components of a nucleotide EXCEPT: A. Pentose sugar B. Phosphate group C. hydroxyl group D. Nitrogen-containing base 5. The following can be dissolved in water EXCEPT: A. Salts B. Carbohydrates C. Lipids D. Hydrochloric acid
Why the Number of Electrons Matter Since we know each element as a defined number of protons, we can also use that number to determine the number of electrons, assuming the element has no charge. Let’s write some out: ELEMENT NUMBER OF PROTONS NUMBER OF ELECTRONS C A B O C D Al E F Na G H Si I J
The atomic number of sulfur is 16, Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound. a. HS b. HS2 c.H2S d. H3S2
Nitrogen’s atomic number is 7. Just from the atomic number, can you determine how many protons, neutrons, and electrons a nitrogen atom has and how many electrons are in its first and second electron shells? (Assume the atom is electrically neutral.)

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