Chemistry

1. How many covalent bonds can nitrogen form? 2. Which of the following represents a covalent compound? A. O2 B. CO2 C. Cl2 D. NaCl3. 2. Nitrogen is a diatomic element with five valence electrons. Create a model of a molecule of nitrogen.
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Is this statement true or false?A compound is a substance made of two or more elements joined in a chemical reaction.truefalse
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How did the Heisenberg uncertainty principle contribute to the idea that electrons occupy clouds, or orbitals?
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Select the correct answer.Tropical forests contain dense trees, which allow less sunlight to penetrate. Emergent trees are trees that grow to a height of more than 45 to 55 meters, above the usual height of trees in tropical forests. Which system provides the best possible explanation for why these trees grow to those heights?A. shunted growth patternB. homeostasisC. due to less exposure to sunlightD. phototropism
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How do mixtures form?
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The stationary state with the lowest energy is called the _______.
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17. The choose the answer that is correct about the Earth's mantle.made of magnesium, iron, and calciummade of rocky materials and watermade of the same rocky materials as the crustmade mostly of iron and nickel
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What state is represented by the sign (s)liquidgassoliddissolved in water
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Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3) and acetic anhydride (C4H6O3):C7H6O3 + C4H6O3 -----> C9H8O4 + HC2H3O2(a) How much salicylic acid is required to produce 1.5 x 10^2 kg of aspirin, assuming that all of the salicylic acid is converted to aspirin? (b) How much salicylic acid would be required if only 80% of the salicylic acid is converted to aspirin? (c) What is the theoretical yield of aspirin of 185 kg of salicylic acid is allowed to react with 125 kg of acetic anhydride? (d) If the situation described in part (c) produces 182 kg of aspirin, what is the percentage yield?
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Which type of energy uses the photoelectric effect?BiomassSolarGeothermalWind
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what takes place when the pollen of the one plants move and fertilize the ovum of another plant
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Filtration of wastewater flowing over a surface of land with vegetation and water is aan artificial wetlanda stabilization ponda biodegradable treatmentan open aeration pond
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A compound contains 40%carbon, 6.7%hydrogen, and 56.3%oxygencalculate the molecular formula of the compound, if its vapour density is 90. Note that molecularmass=2 x vapeur density
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How many particles would be found in a 12.7 g sample of ammonium carbonate? Show workkk
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1. Newton's First Law is also called theLaw of
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Imagine that you and your friend are at the beach. You have your chairs and umbrella set up in the perfect spot near the water so you can jump in to cool off with ease. A few hours into your stay, the water line has managed to creep up closer and closer to your chairs and your things start to get wet! Your friend points up at the Moon and says it is to blame. What does this mean? Write a response in complete sentences. plz someone help!!!!!!!
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What is a mixture ?How do homogeneous & heterogeneous mixtures differ ?
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Based on the electron configuration of the twoatoms, predict the ratio of metal cationic (+) atomto nonmetal anionic (-) atom in the compound.Hydrogen 1sFluorine 1s22s22p5A. 2:3B. 1:2C. 1:1D. 3:2
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why does a oxygen atom form a 2- ion
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Earths layers are determined by their physical properties and chemical composition. In the lesson, you learned about each of Earths layers, what the layers are made of, and why they are important to the Earth. In the space below, write about how the atmosphere may be classified. Would it be part of the lithosphere, or a separate layer? Explain your answer.
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EARTH SCIENCE: PLEASE HELP ME !!! Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)computer simulationsprint encyclopedia entriesspace telescopessolar system models
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what is an example of force pair
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Synthetic fibers, like plastic, are derived from organic compounds. These fibers have been chemically changed by humans to last longer for better storage and more effective uses. These fibers are stronger than naturally occurring fibers like cotton and wool. Which of the following is a downside to these synthetic fibers when compared to natural fibers? A. The longer lasting material is more difficult to break down. B. The longer lasting material is less useful in manufacturing. C. The longer lasting material is not able to withstand high temperatures. D. The longer lasting material makes the fibers more expensive to buy.
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can you help me with this
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