Chemistry

Which option is an element? a. oxygenb. sodium chloridec. aird. water
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please anyone help me with this
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After a particularly fierce blow, he crawled to his feet, too dazed to rush. . . . All the pain he had endured was as nothing compared with the exquisite agony of this. With a roar that was almost lionlike in its ferocity, he again hurled himself at the man. But the man, shifting the club from right to left, coolly caught him by the under jaw, at the same time wrenching downward and backward. Buck described a complete circle in the air, and half of another, then crashed to the ground on his head and chest.What is the mans role in this excerpt?The man is the protagonist because he is the main character.The man is the protagonist because he proves his superior strength.The man is the antagonist because he reveals his cruel nature.The man is the antagonist because he is opposing Buck.
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True or False?Solubility and melting point are two examples of physical properties.
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What is the density of a substance with a mass of 15.0 g and a volume of 5.0 mL? A. 0.33 g/mL B. 3.0 g/mL C. 10.0 g/mL D. 20.0 g/mL
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How does an increase in the annual melt season in Antarctica have a global effect?a.It causes an increase in heat related illness and death.b.It causes the global concentration of carbon dioxide to decrease.c.The water in the melting glaciers can cause sea levels to rise.d.None of the above is true.Please select the best answer from the choices providedABCD
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3-4 sentences if you give me 3-4 ill like if you give me 5 ill give 5 star if you give me 6 ill do all and branliest pls help. Why is the study of human movement important?
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PLEASE HELP!!!!The student is chemically combining 4 g of hydrogen with 2 g ofoxygen. The reactants have a coefficient of 2 in them. What will be themass of the product?A. 12 gramsB. 10 gramsC. 8 gramsD. 6 grams
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What are the two main types of cells, and how do we classify them?
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QUESTION 2: How is velocity different from speed? *1 pointVelocity is when an object goes in reverseVelocity is the direction an object moves in, and it has nothing to do with speedVelocity is speed and direction together
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The atomic mass of an atom is calculated by adding up what two subatomic particles
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HELP ASAPWhich of the following is NOT a factor in conduction? A. Temperature difference B. Fluid flow C. Surface Contact D. Cross sectional area
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what is the mass of 4.900 x 10^25 atoms of He
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If Maria winks exactly 5 times every minute while she is awake and she sleeps exactly 8 hours a day, how many times does Maria wink in a day? winks/day.
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What ingredients can be alternative for cornstarch?
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A 10-kg ball is accelerated 500 m / s2 by a force of
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What subatomic particle identifies any type ofatom?
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Is acid a chemical weather Yes or noIs carbon dioxide a chemical weather Yes or noIs water a chemical weatherYes or noIs oxygen a chemical weatherYes or no
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chemistry question please help
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Some Reactions are endothermicHow does the temperature and energy change in an endo thermic reaction? temperature changeenergy changedecreasesenergy taken inBdecreasesenergy given outincreasesenergy taken inincreasesenergy given outDincreases energy given out
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What are the possible consequences of adding a chemical to the environment
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A student titrates 0.1719 g of an unknown monoprotic acid to the equivalence point with 21.85 mL of 0.1062 M NaOH. Which of the following is most likely to be the unknown acid? propionic acid (MM 74.08 g/mol) nitrous acid (MM 47.01 g/mol) chlorous acid (MM 68.46 g/mol) benzoic acid (MM 122.12 g/mol) lactic acid (MM: 90,08 gimol)
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radium 226 has a half life of 1600 yers. suppose we have a 300g sample. how much remains after 200 years
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Lars observes a substance to be a solid and to float in water at room temperature (23C). Based on the given properties, which substance is the most likely identity of this sample?Substance Melting Point (C) Boiling Point (C) Density at Room Temperature (g/cm3)carbon tetrachloride -22.9 76.7 1.59cetyl alcohol 49.3 344 0.811dichlorobenzene 53.5 174 1.25sulfur hexafluoride -64 -50.8 0.00617A. carbon tetrachlorideB. cetyl alcoholC. dichlorobenzeneD. sulfur hexafluoride
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