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Questions in chemistry

[Done] A non-metal usually forms 2 covalent bonds in its compounds. How many electrons will it have in its valence shell?

[Done] When you flick a coin so that it slides across a table, it slows down. What is the name of the force that slows it down?

[Done] Polished metals have a metallic luster, which means that they reflect light in a shiny and reflective manner.

[Done] Why does methane have a low boiling point?

[Done] How many valence electrons do rare earth metals have?

[Done] Two forms of solid carbon, diamond and graphite, differ in their physical properties due to differences in their _____.

[Done] When [tex]8.00 \times 10^{22}[/tex] molecules of ammonia react with [tex]7.00 \times 10^{22}[/tex] molecules of oxygen according to the chemical equation shown below, how many grams of nitrogen gas are produced? \[ 4\text{NH}_3(g) + 3\text{O}_2(g) \rightarrow 2\text{N}_2(g) + 6\text{H}_2\text{O}(g) \]

[Done] 1. Compare the location of electrons in an atom based on Bohr's theory with the location of electrons in an atom based on the current atomic theory. 2. Rutherford performed his gold-foil experiment to test Thomson's plum-pudding model. Describe what the results would have looked like if it had supported the plum-pudding model instead of contradicting it. Please explain concisely.

[Done] Pentane, C5H12, will react as shown below: ____C5H12(l) + ____O2 → ______CO2 + ______H2O 1. Balance the equation above by putting coefficients into each blank space. - Answer: 1C5H12 + 8O2 → 5CO2 + 6H2O 2. How many atoms of oxygen are in 144 grams of pentane? Step 1: 144 g of C5H12 × (1 mole / 72.17 g) = 1.995 moles of C5H12 Step 2: 1.995 moles of C5H12 × (8 moles of O2 / 1 mole of C5H12) = 15.962 moles of O2 Step 3: 15.962 moles of O2 × (6.02 × 10^23 atoms of O2 / 1 mole of O2) = 9.609 × 10^24 atoms of O2 3. How many atoms of oxygen are in 192 grams of carbon dioxide gas? Step 1: 192 grams of CO2 × (1 mole of CO2 / 44.01 grams of CO2) = 4.363 moles of CO2 Step 2: 4.363 moles of CO2 × (2 atoms of O / 1 mole of CO2) = 8.726 moles of O atoms Step 3: 8.726 moles of O atoms × (6.02 × 10^23 atoms / 1 mole) = 5.253 × 10^24 atoms of O 4. A) CIRCLE ONE: True or False: The reactant you begin with fewer grams of is your limiting reactant. B) If 32 g of oxygen gas and 32 g of pentane are combined, how much water will be produced, in moles? (Use your reaction from the top of the first page) Note: Review the calculations for accuracy and ensure the steps align with stoichiometric principles.

[Done] What is the balanced chemical equation for caffeine?