Which of the following answers shows CH4 +2O2=CO2 +H2O as balanced?

A. CH4 + 2O2 = 2CO2 + 2H2O

B. 2CH4 + 4O2 = 2CO2 + H2O

C. 2CH4 + O2 = 2CO2 + H2O

D. CH4 + 2O2 = CO2 + 2H2O

Answer Explanation:

For the formula CH4 + 2O2 = CO2 + H2O to be balanced there must be an equal number of molecules on both the reactant and product sides. In this case, for the formula to be balanced, a coefficient of a 2 needs to be placed in front of the O2 and the H2O molecules. This would make both the reactant and product sides have one carbon, four hydrogens, and four oxygens

Therefore, the Correct Answer is D.

Q #1: Which section of the digestive system is responsible for receiving chyme and further digesting it?

A. The large intestine

B. The duodenum

C. The jejunum

D. The gallbladder

Answer Explanation

The duodenum is the first section of the small intestine. It receives partially digested food (also called chyme) from the stomach, further digesting it with the help of enzymes released by the gall bladder. Then, the food enters into the jejunum, then the ileum. The large Intestine's main function is the reabsorption of water into the body to form solid waste. It also allows for the absorption of vitamin K produced by microbes living inside the large intestine.
Q #2: A doctor needs to convince his boss to approve a test for a patient. Which statement below best communicates a scientific argument that justifies the need for the test?

A. The patient looks like he needs this test.

B. The doctor feels that the patient needs this test.

C. The patient's symptoms and health history suggest that this test will enable the correct diagnosis to help the patient.

D. The patient has excellent insurance that will pay for several tests, and the doctor would like to run as many tests as possible.

Answer Explanation

A scientific argument should be based on measurable and observable facts such as the patient's current symptoms and health history. Discussing the patient's appearance or the doctor's feelings does not communicate a scientific argument. While insurance may be a factor in most healthcare systems, the status of the patient's Insurance does not communicate a scientific argument that justifies the need for the test
Q #3: Which of these does NOT match the nitrogenous base to the nucleobase?

A. Purine: Adenine

B. Purine: Thymine

C. Pyrimidine: Uracil

D. Pyrimidine: Cytosine

Answer Explanation

There are two types of nitrogenous bases: purine and pyrimidine bases. Purine bases have two rings in their structure and consist of adenine and guanine. Pyrimidine bases only have one ring in their structure and consist of thymine and cytosine (DNA) and uracil and cytosine (RNA). Therefore, the correct answer is B since thymine is a pyrimidine.

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Which of the following answers shows CH4 +2O2=CO2 +H2O as balanced?

More Questions on TEAS 7 Science

Q #1: Which section of the digestive system is responsible for receiving chyme and further digesting it?

Answer Explanation

Q #2: A doctor needs to convince his boss to approve a test for a patient. Which statement below best communicates a scientific argument that justifies the need for the test?

Answer Explanation

Q #3: Which of these does NOT match the nitrogenous base to the nucleobase?

Answer Explanation

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