What kind of symbols are used to represent the reactants and products? O element symbols from the periodic table O multiplying scale letters of their name

Determine the formula weight of caffeine, C₈H₁₀N₄O₂. Provide an answer to two decimal places.

Fill in the Blanks Chemical Price/kg (in dollars) NaOH 21.17 CaCl2 41.28 КОН 31.38 CUSO4 93.32 NH4NO3 59.64 NH4CI 25.04 NaCl 21.15 NaNO3 72.35 Type your answers in all of the blanks and submit Another requirement is that the cost of the salt needs to be evaluated to determine if it is economical to use. To do this, you should consider the price per degree of dropping the temperature of the solution. The table of prices per kg for each salt is shown above. Let's determine the cost for the NaOH solid as an example. We want to determine how much it costs to change the temperature by 1 deg C so we start with the cost given in the table and end with $/deg C. For NaOH: 21.17 $/ 1 kg) X ( 1 kg/ 1000 X ( Type your answer here g/ Type your answer here deg C) Please type your answer to submit Please type your answer to submit Type your answer here $/deg C

A student calculated the number of moles of carbon dioxide present in a 100.0g of gaseous mixture. If the student determined that there is 0.30 mole of carbon dioxide present in the same, what is the percent of carbon dioxide in the sample?

Which of the following best describes the system depicted in the diagram? Mixture of elements Element Compound Mixture of compounds

Students react zinc with hydrochloric acid to produce zinc chloride and hydrogen gas in a test tube. They weighed the reactants, the flask, and the balloon that captured the hydrogen gas. The zinc was added to the acid and the balloon attached across the mouth of the flask. The table shows the data each group collected. Zinc Zinc & Chloride Hydrochloric & |Group acid Hydrogen gas 155.67 g 155.65 g 2 157.80 g 157.78 g 3 148.22 g 146.54 g 4 155.93 g 155.92 g 169.42 g 169.43 g Explain how the data supports the Law of Conservation of Mass is followed.

Which of the following is a chemical property? A length of a matchstick B color of a matchstick C ability of a matchstick to float on water D ability of a matchstick to burn when struck

Physical Properties Malleability (Malleable means- (it shatters or can be hammered into thin sheets) Brittle Physical Characteristics (color, luster, flaky, powder, etc.) Element Symbo cracks when struck) 1 Yes/No Yes/No 1. Aluminum 2. Carbon 3. Iron 4. Magnesium 5. Silicon 6. Sulfur 7. Tin 8. Zinc

Determine the mol H2O/mol CaSO4 if you have the following data to two decimal places (MM H2O =18.02 g/mol; MM CaSO4 = 136.14 g/mol) mass of sample 1 mass of water in sample 0.23 mass of CaSO4 in sample 0.76

Figure 1 Figure 2 H₂O2 (1)- ---> H₂O2 (g) H₂O₂(aq) ---> H₂O (I) + O₂ (g) Which of the following statements BEST explain which figure is a model of a chemical change? O Figure 2, because there are 3 states of matter present. Figure 1, because H₂O2 changes state of matter. Figure 2, because new substances are produced. Figure 1, because H₂O2 created a product.