1.compared to adults,a newborn breathes a. a quarter as ofter b.half as often c.the same amount d.four times as often 2.the cluster of air sacs at the end of each bronchiole is called a.bronchi b.traches c.alveoli d.bronchus 3.the flap of elastic cartilage that protect food from entering the larynx is called the a.epiglottis b.glottis c.larynx d.esophagus 4.when blood leaves the lungs it is a.oxygenated b.deoxygenated c.exchanging gases d.rich in carbon dioxide

January 27, 2020// Blog//

The right matches are: 1.Hydrologic is matched with D. it’s all about water Hydrology is the science of the earth which is interested in the terrestrial branch of the water cycle, that is to say in the exchanges between the atmosphere, the terrestrial surface and its subsoil. We speak of hydrosphere to designate...

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Which of the following is a necessary reactant for cellular respiration to occur? Carbon dioxide Nitrogen Oxygen Water

January 27, 2020// Blog//

The right matches are: 1.Hydrologic is matched with D. it’s all about water Hydrology is the science of the earth which is interested in the terrestrial branch of the water cycle, that is to say in the exchanges between the atmosphere, the terrestrial surface and its subsoil. We speak of hydrosphere to designate...

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Fill in the blanks. 12. _________are the basic units of structure and function in living things 13. A(n)__________is a group of similar cells that perform a specific function in an organism. 14. __________are nerve cells that carry response information to muscles and organs. 15. Carbon dioxide and________ are outputs of cellular respiration. 16. __________is essential to living things because many of the chemical reactions that occur in living things require it. 17. scientists did not discover the cell until the__________ was invented because cells are too small to see without one.

October 15, 2019// Blog//

Answer: The correct answer would be pathway C. Pathway C represents aerobic respiration whereas pathways A and B represent fermentation. Under aerobic respiration, the cell or organism is able to completely oxidize the glucose. It produces a large amount of energy (approximately 36-38 ATP) as compared to the fermentation...

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What is the theoretical yield of carbon dioxide if H3C6H5O7+3NaHCO3-3CO2+Na3C6H5O7

October 14, 2019// Blog//

Answer: 4 people can carry safely for one mission. Explanation: To calculate the number of moles of produces by 1 astronaut, we use the formula:    ….(1) Molar mass of carbon dioxide = 44 g/mol Given mass of carbon dioxide = Putting values in equation 1, we get: We are given a chemical equation: Moles

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Legumes are plants that produce: bacteria phosphorus nitrogen compounds carbon dioxide

October 14, 2019// Blog//

The Air Quality Index (AQI) is an index for reporting daily air quality.The higher the AQI value, the greater the level of air pollution and the greater the health concern. Nitrogen dioxide is a pollutant that is measured by the Air Quality Index. Correct answer: B Besides nitrogen dioxide AQI measures also the following...

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A gas of unknown identity diffuses at a rate of 83.3 mL/s in a diffusion apparatus in which carbon dioxide diffuses at the rate of 102 mL/s. Calculate the molecular mass of the unknown gas. Give your answers in units of g/mol to three significant figures.

October 13, 2019// Blog//

Answer: Option (c) is the correct answer. Explanation: Atomic number means the number of protons present in an element. Whereas atomic mass means the sum of total number of protons and neutrons present in an element. Also, it is known that when an atom is neutral then its number of protons equal number of electrons.

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What causes the difference in bond angles in carbon dioxide and water? A) the distance between the atomsin either molecules B) the facr that there are tei oxygen atoms in carbon dioxide and only one in water C) the fact that the number of lone pairs of electrons on the central atom is greater in the case of water D) the presence of a carbon atom in carbon dioxide E) the presence of a hydrogen atom in water

October 12, 2019// Blog//

Answer is: C) the fact that the number of lone pairs of electrons on the central atom is greater in the case of water. Carbon(IV) oxide is nonpolar because CO₂ is linear molecule and the oxygen atoms are symmetrical (bond angles 180°). Water is polar because of the bent shape of the molecule. Oxygen atom

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Which of the following are examples of the effects of living things on the atmosphere and climate? outgassing of volcanoes the buildup of oxygen in the atmosphere mass extinctions changes in levels of carbon dioxide

October 12, 2019// Blog//

The right answer is C. ATP is a key molecule of cellular energy Living beings derive their energy from the oxidation of nutrients, and this is true even for chlorophyllous plants (which use the energy of photons to make organic matter that can be oxidized later). However, the energy released during this oxidation is not...

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According to the following reaction, how many moles of carbon dioxide will be formed upon the complete reaction of 22.7 grams of benzene (C6H6) with excess oxygen gas?

October 12, 2019// Blog//

You would have to use the ideal gas law: PV = nRT where, P = pressure V = volume n = molesR = universal gas constant for a specific pressure (in this case it’s 62.364 torr)T = temperature in Kelvin First, convert Celsius to kelvin by adding 273 to 25, which gives you 298K Now

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When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 21.6 g of carbon were burned in the presence of 72.3 g of oxygen, 14.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

October 11, 2019// Blog//

Answer: Neon Explanation: Elements are arranged in a certain order in a table known as the periodic table of elements, and they are arranged in groups and periods with similar properties to each other. Earlier in history when Dmitri Medeleev created the first periodic table, some spaces were left open because many elements...

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