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: A patient lying flat on their back is in which of the following positions?

A. Prone

B. Supine

C. Lateral

D. Medial

Answer Explanation
Q #2: Which of the following does NOT obey the law of independent assortment?

A. Two genes next to each other on a chromosome

B. Two genes on opposite ends of a chromosome

C. Flower color and height in snapdragons

D. Seed color and flower color in peas

Answer Explanation

Two genes next to each other (or within a specified close distance) are said to be linked. Linked genes do not follow the law of Independent assortment because they are too close together to be segregated from each other in meiosis.
Q #3: In general, where in the periodic table of elements are the elements with the largest atomic radii located?

A. Upper-right corner

B. Upper-left corner

C. Bottom-left corner

D. Bottom-right comer

Answer Explanation

In general, atomic radius increases moving down a group due to the increasing number of electron shells. In general, atomic radius decreases moving from left to right across a period due to the increasing number of protons in the energy level. Therefore, atoms of elements in the bottom-left corner of the periodic table tend to have the largest atomic radii.

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

More Questions on TEAS 7 Science

Q #1: A patient lying flat on their back is in which of the following positions?

Answer Explanation

Q #2: Which of the following does NOT obey the law of independent assortment?

Answer Explanation

Q #3: In general, where in the periodic table of elements are the elements with the largest atomic radii located?

Answer Explanation

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