Which of the following atoms is a cation?
A. 14 protons, 14 neutrons, 18 electrons
B. 34 protons, 45 neutrons, 36 electrons
C. 35 protons, 44 neutrons, 35 electrons
D. 82 protons, 125 neutrons, 78 electrons
Because it has more protons than electrons, this atom has a positive charge and can be classified as a cation. When a metal such as sodium reacts to become stable, it loses its valence electrons. At first, it is a neutral atom with 11 protons and 11 electrons. When it loses an electron, the number of protons does not change, and the atom has 11 protons and 10 electrons. Because there is one more positively charged proton, a cation forms. A cation is an ion with a net positive charge.
Therefore, the Correct Answer is D.
More Questions on TEAS 7 Science
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Q #1: Which of the following is supported by the cell theory?
A. Cells are alive and recognized as the building blocks for life.
B. Scientists can identify and differentiate cells by using a microscope
C. Cells are produced from existing cells using meiosis instead of mitosis.
D. Living things are composed of a single cell that remains undifferentiated
Answer Explanation
After scientists were able to view cells under the microscope they formulated the cell theory. One part of this theory concluded that all cells are alive. They also represent the basic unit of life.
All living things are made of cells. Cells are the smallest structural units and basic building blocks of living things. Cells contain everything necessary to keep living things alive. Varying in size and shape, cells carry out specialized functions. This theory, or in-depth explanation, about cells consists of three parts:
- All living things are composed of one or more cells.
- Cells are alive and represent the basic unit of life.
- All cells are produced from pre-existing cells.
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Q #2: Which part of the digestive system comes before the stomach?
A. mouth
B. esophagus
C. ileum
D. colon
Answer Explanation
Oral Cavity is the first part of the digestive system. It is bounded by the lips and cheeks and contains the teeth and tongue. Its primary function is to masticate, or chew, and moisten the food.
Pharynx, or throat, connects the mouth to the esophagus.
Esophagus is a muscular tube about 25 centimeters long. Food travels down it to the cardiac sphincter of the stomach.
Pyloric sphincter. The exit of the stomach.
Small intestine is about 6 meters long and consists of three parts: duodenum, jejunum, and ileum.
Large intestine, consists of the cecum, colon, rectum, and anal canal. The cecum is located where the small and large intestine meet. The primary function of the large intestine is to compress the waste and collect any excess water that can be recycled.
Colon is about 1.5 to 1.8 meters long and consists of four parts: the ascending, transverse, descending, and sigmoid colon.
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Q #3: Which is classified as a type of acid-base reaction that produces a salt?
A. Combination
B. Decomposition
C. Hydrolysis
D. Neutralization
Answer Explanation
A neutralization reaction is a type of acid-base reaction where an acid and base react to form a salt and water.
In an aqueous solution, a base increases the hydroxide concentration (OH–), while an acid increases the hydrogen ion (H+) concentration. Sometimes, neutralization reactions also occur. This type of reaction happens when an acid and a base react with each other to form water and salt. Salt is typically defined as an ionic compound that includes any cation except H+ and any anion except OH–. Consider the following example of a neutralization reaction between hydrobromic acid (HBr) and potassium hydroxide (KOH).
HBr+KOH→KBr+H2O
Not all neutralization reactions proceed in the manner where all reactants are in the aqueous phase. In some chemical reactions, one reactant may be a solid. The neutralization reaction can still proceed to completion.
