Biology, 23.09.2021 05:10 galaxychild101
A chemist has a block of copper metal (density is 8.96 g/mL). They
drop the metal into a graduated cylinder containing water, and find the
volume change is 2.50 mL. What is the mass of the block, in grams?
Answers: 2
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In which state was more than 100 billion tons of coal mined in 2005?
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Biology, 22.06.2019 21:00
Which statements about a food chain are true? choose all answers that are correct. a.plants are the first living organisms in food chains on land. b. the plants in a food chain are called herbivores. c. all food chains on land begin with energy from the sun. d. carnivores in a food chain eat only plants.
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Biology, 22.06.2019 21:00
An adult inhales about 6.0ร10โ4 m3 of fresh air during a breath. only 20% of fresh air is oxygen. assume the pressure in the lungs is 1.0ร105 paand the air is at a temperature of 300 k. how many oxygen molecules are in each breath? a. 1.4x10^23 b. 2.9x10^21 c. 4.9x10^-4 d. 2.9 x10^25
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Biology, 22.06.2019 21:40
According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this? a. this implies that dna and proteins aren't essential in cells today. b. this implies that rna can catalyze any chemical reaction that enzymes catalyze. c. this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna. d. this implies that dna and proteins evolved after rna.
Answers: 2
A chemist has a block of copper metal (density is 8.96 g/mL). They
drop the metal into a graduated...
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