Which of the following measurements has three significant figures?A. 5100 m
B. 0.005 m
C. 0.510
D. 0.051
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The correct answer is C: 0.510 m
N I C E - D A Y!
Answer:
C
Explanation:
a) has 2 sig. figures
b) has 1 sig. figures
c) has 3 sig. figures
d) has 2 sig. figures
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All parts of the rock cycle are connected, whether directly or indirectly. Which statementbest shows how sedimentary rocks are related to igneous rocks? 1.Under pressure, sedimentary rocks form from igneous rock. 2.Igneous rocks can weather, creating sediments that form sedimentary rocks. 3. During weathering, sedimentary rocks melt and form igneous rock. 4.Under pressure, igneous rock undergoes changes that form sedimentary rock.
Answers
Explanation:
The type of food and therefore the amount of food that is a gift in your epithelial duct once you consume alcohol have the foremost direct impact on the speed of alcohol absorption.
When you consume alcohol on the associate empty abdomen, the alcohol is sometimes absorbed within the blood among fifteen minutes to two-and-a-half hours. If you have got a moderate quantity of food in your abdomen once you drink, that speed slows all the way down to thirty minutes to a few hours. If you’re drinking on a full abdomen, alcohol absorption ranges from 3 to 6 hours.
Answer: The answer is C. Food.
Reactant A contains 85.1 J of chemical energy. Reactant B contains 87.9 J of chemical energy. Product C contains 38.7 J of chemical energy. If the reaction absorbs 104.3 J of chemical energy as it proceeds, how much chemical energy must product D contain? Explain your answer.
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Answer: 238.6 J
Explanation:
According to the law of conservation of energy, energy can neither be created nor be destroyed. It can only be transformed from one form to another.
Endothermic reactions are those in which heat is absorbed by the system and thus the energy of products is higher than the energy of reactants.
For the given reaction:
Energy of A = 85.1 J
Energy of B = 87.9 J
Energy on reactant side = Energy of A + Energy of B + Energy absorbed 85.1 + 87.9 + 104.3 = 277.3 J
Energy on reactant side = Energy on product side = 277.3 J
Energy on product side = Energy of C + Energy of D
277.3 J = 38.7 J + Energy of D
Energy of D = 238.6 J
Thus chemical energy product D must contain is 238.6 J
The law of conservation of energy states that energy is not created or destroyed during chemical reactions. The total amount of energy in the reactants, plus the energy absorbed during the reaction, must be equal to the total energy of the products.
Product D contains (85.1 J + 87.9 J + 104.3 J) – 38.7 J = 238.6 J of chemical energy.
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5.3 to 4.3 is more acidic. 1 pH is more acidic than 2 pH The base starts at 8.
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Copy and paste questions and respond in complete sentences.
Include a space between each question.
Be specific with your responses for each question. Assume your reader has no knowledge of the subject and you are teaching them via your answers.
Please answer the following questions:
Why does Na have only one dot?
Why do none of these diagrams show more than 8 dots?
What relationship do you notice between the dots in these two charts?
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why? (Hint: Octet Rule (Links to an external site.))
Answers
Hello! Here's the answer I was able to come up with:
Why does Na have only one dot?
Sodium, or Na, has only one valence electron. (This makes the atom tend to participate in ionic bonding and "give" its single valence electron to an atom like chlorine.)
Why do none of these diagrams show more than 8 dots?
It is physically impossible for an atom to have more than 8 electrons in its valence layer, according to the Octet Rule.
What relationship do you notice between the dots in these two charts?
The dot diagram for each element represents the number of electrons each element will have in its outermost, or valence, shell. (2-8-8)
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why?
An atom can have a maximum of two electrons in its innermost layer. Hydrogen and helium have only one and two electrons, respectively, so they don't have enough electrons to actually have more than one layer. Therefore, their outermost layer is, in fact, their only layer. This is why the number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table.
Don't copy this word for word! You will most likely be in trouble for plagiarism. Instead, rewrite these ideas in your own words, or paraphrase. Good luck, and I know you can do it! ♥