Answer:
B) an error occurred, the mass of the reactants should equal the mass of the products.
Explanation:
The answer choices are:
A) no error occurred, some of the products are always lost as heat.
B) an error occurred, the mass of the reactants should equal the mass of the products.
C) an error occurred, the products should weigh more than the reactants.
D) no error occurred, water is not weighed when determining the weight of the products.
Solution
The basis to answer this question is the law of conservation of mass.
Any chemical reaction satisfies the law of conservation of mass: mass cannot be either created nor destroyed, so, always, the mass of the reactants equal the mass of the products.
Thus, since he measured the mass of his reactant materials to be 35g and he reported that his products weighed 32g, his data are in clear contradiction of the law of conservation of mass. So, there is an error in his results: the mass of the reactants should equal the mass of the products.
Transitional fossils help scientists bridge gaps in the tree of life, resulting in a picture of gradual evolution over millions of years.
Answer: On a cool October morning you dressed warmly for a 10K race sponsored by a local charity, and about half way through the race you realize that you have stopped sweating in all the warm running clothes you put on and are beginning to feel faint and slightly disoriented. The most likely reason of his symptoms are that <em><u>you are suffering a dehydration followed by possible hypothermia.</u></em>
Explanation:
If you <u>run dehydrated</u>, your <em>heart system</em> will be struggling in poor conditions, so it will be overexposed and your heart rate will rise considerably. On the other hand, <em>the body will not be as efficient in regulating body temperature.</em>
Your <u>muscles and your brain </u>as well as the entire <u>nervous system </u>will not respond the same and will be demanded in conditions not suitable for your effort, therefore, the response time will fall, you may suffer cramps, headache, dizziness and even muscle spasms . If the effort is more than two hours long, you probably need more than water and you should try <u>sports drinks </u>also.
When running at <em>low temperatures</em>, a relevant factor is <em>clothing.</em> If we are not <u>properly dressed to run</u> in cold and windy conditions, we will naturally be more exposed to suffer from <em>hypothermia.</em> The manifestations of hypothermia are varied and include pain and tingling in the hands and feet, tremors or chills, decreased physical capacity and, in more extreme cases, alterations of consciousness.
A person who is suffering from hypothermia should wrap in dry clothes and get out of exposure to cold or wind , hydrating with warm liquids can also be useful.
D.) <span>Unlike DNA, RNA is "a single stranded molecule"
Hope this helps!</span>
