CHE_106_Recitation_6

8. Fill in the following boxes. . HO. heat HO. SOC2 NaN3 1. he t 2. H2C 2 Mel +

Can you help me with questions 4, 5, 6, and 7 please?

2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the following would supply evidence to propose a chemical change has taken place? a. The granules dissolve completely. c. The volume of the liquid increases. b. The liquid gives off heat. d. The granules become smaller. 5. Which of the following does NOT indicate a chemical change is occurring? a.…

A pure substance A is found to change upon heating into two new pure substances B and C. Substance B,        but not substance C, undergoes reaction with oxygen. Based on this information we definitely know that ____. A. substance A is a compound and C is an element. B. Both A and B are compounds. C. is a compound and C is an element. D. A is a compound. Vanillin contains 63.15% C, 5.30% H, and 31.55% O whether it is extracted from vanilla beans, synthesized chemically from clove oils, or extracted from wood pulp wastes. Vanillin is most likely to be: A. homogenous mixture of elements B. heterogeneous mixture of elements C. compound of C, H, and O D solution of C in H and O   A solid melts gradually between 85°C and 95°C to give a milky, oily liquid. When a laser beam shines through the liquid, the path of the beam is clearly visible. The milky liquid is likely to be: A.heterogeneous mixture                        c. gaseous solution B.homogeneous mixture d. compound   If you were…

2. Homogeneous mixtures(s) A. distilled water B. gasoline C. sandy water D. copper turnings + iron filings E. white gold (gold + palladium)

5.) Correctly match the terms listed on the left with the substances listed on the right. More than one term may be used for each substance. A. element B. compound C. heterogeneous Mg Fe mixed with sand saltwater D. mixture water E. homogeneous F. pure substance G. Solution M9SO. 41 8 3. 5 CO

4. Brass is an alloy of copper and zinc. Varying the mass percentages of the two metals produces brasses with different properties. A brass called yellow zinc has high ductility and strength and is 34-37% zinc by mass. Find the mass range (in g) of copper in 135 g of yellow zinc. 1. 85.1g - 89.1g 2. 117g - 122g 3. 45.9g - 50.0g 4. 62.9g - 68.5g

pour it 2. Still sleepy from a late night studying, you take the milk out of the refrigerator and pour it on your lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation for the fact of coagulated milk onto your cereal. The last time you saw milk coagulate like that was when you added breakfast cereal. Unfortunately, by the time you notice the funny smell you have already poured clumps lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation foea added that spoiled milk coagulates.

3. Which process can separate a mixture of finely powdered iron and wheat flour? A. distillation 3. B. filtration C. using a magnet D. sieving E. sublimation

27 A chemist prepares a solution of sodium chloride (NaCl) by measuring out 0.50 g of NaCl into a 250. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Cl anions in the chemist's solution. do Be sure your answer is rounded to 2 significant digits. 18 Ar mol x10 L Submit Assignment Continue 2022 McGraw Hill LLC. AIl Rights Reserved. Terms of Use Privacy Center Accessibility Show All IMG-6095.jpg IMG-6096.jpg IMG-6097.jpg IMG-6098.jpg IMG-6099.jpg MacBook Air DD DII F12 F11 F10 F9 80 F7 F8 F6 F5 F4 esc F2 F3 F1 & % @ # 7 8 3 4 5 6 1 2 { P E R Y Q W %24

Experiment 11: Decomposing Baking Soda 7. A student collects the following data when decomposing an unknown mixture containing baking soda, NaHCO3. Find the mass of baking soda in the sample and the % of baking soda in the sample. 2 NaHCO3 (s) → Na2CO3 (s) + H2CO3 (g) Mass of test tube + unknown mixture (before heating) 24.1612g Mass of test tube 23.1186 Mass of test tube + residue (after heating) 23.8910g a. Mass of unknown mixture: 0426a 124 b. Mass of H2CO3 (before heating - after heating): c. Mass of NaHCO3 in unknown mixture and percent of NaHCO3 in unknown

NHẠNO3 MgSO4 [1] Mass of salt (g) 1.968 1.981 [2] Volume of DI water (mL) 50.0 50.0 0.039 0.0396 Mass of DI water (g) [3] Temperature of DI water (°C) 22.5 22.5 [4] Temperature of mixture after dissolution (°C) 19.5 27.1 3 4.6 Temperature difference (°C) [5] Total mass in reaction (g) [6] Enthalpy of solution AHsolution (cal/mol)

B. Density of Liquid 1. Obtain a sample of distilled water (any quantity of your choice) anddetermine its mass and volume. Record your data on table 3 in theexperimental report 2. Calculate the density of the water sample using equation 1 Substance     Density (g/mL)    Substance     Density (g/mL)Aluminum       2.7                     Lead                         11.3Brass                8.4                      Zinc                     7.1 Copper           8.9                           Cork                        0.26Tin                  7.3                   Silver                                           10.5Bone             1.80                  Rhodium                              12.4Iron             7.9                         Platinum                                     21.45   Density of Liquid Density can be determined in the laboratory by measuring the mass and volume ofa substance. To measure the density of a liquid, first measure the mass of a clean,dry beaker. Then add…

A chemist fills a reaction vessel with 7.21 atm nitrogen (N,) gas, 6.92 atm hydrogen (H,) gas, and 1.54 atm ammonia (NH,) gas at a temperature of 25.0°C dh Data Under these conditions, calculate the reaction free energy AG for the following chemical reaction: MgO (s) -601.6 -569.3 27.0 N,(g) + 3H,(g) == 2NH,(g) Mercury Hg (g) 61.4 31.8 175.0 Use the thermodynamic information in the ALEKS Data tab. Round your answer to the nearest kild Hg (1) 75.9 Hg (s) -2.29 --- Hg22+ (aq) 153.5 --- --- Hg2Cl2 (s) -210.7 --- Nitrogen N2 (9) 191.6 N2H4 (g) 95.4 159.4 238.5 N2H4 (1) 50.6 149.3 121.2 NH3 (g) -45.9 -16.4 192.8 NH3 (1) -69.54 -26.50 95.09 NHẠNO3 (s) -365.6 -183.9 151.1 NO (g) 91.3 87.6 210.8 NO2 (9) 33.2 51.3 240.1 NOCI (g) 51.7 66.1 261.7 N204 (g) 11.1 99.8 304.4 --- HNO2 (g) -79.5 HNO3 (1) -174.1 -80.7 155.6 HNO3 (g) -133.9 -73.5 266.9 Oxygen -157.2 он (аq) Explanation Check 2021 McGraw-Hill Education. All Rights Reserved Terms of Use Privacy Accessibility F12 F10 F11 F9 F8 吕口 F3 F7 Do0…

what is the mass of baker? What is the mass of sodium acetate?

Gaseous methane (CH4) will react with gaseous oxygen (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O). Suppose 8.8 g of methane is mixed with 22.5 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 3 significant digits. D X 3 ? B Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibility P DII F10 Explanation Check 38² 80 888 F4 FS MacBook Air Fo J ol

4. A very sick diabetic patient needs to get 10g glucose, CHO̟ via an I.V. over the next hour. The concentration 612 of the glucose in the IV bag is 1.25M. What total volume of the glucose solution should the patient receive? Extra challenge: What rate should the IV drip be set at in mL/minute in order to give the patient the right dose in one hour?

For the reaction 2A(g) s B(g) K. = 69 For the reaction A(g) = ½ B(g) Kc = For the reaction ½ B(g) A(g) Kc = Report each answer to two significant figures. Do NOT use scientific notation.

Part A and B

a Assume that mitochondria are cylinders 8.00 um in length and 0.800 pm in diameter. What is the volume of a single mitochondrion? The volume of a cylinder is given by the expression: V = n x y2 x h Volume= m

S [Review Topics] a. Merchants usually sell small nuts, washers, and bolts by weight (like jelly beans!) rather than by individually counting the items. Suppose a particular type of washer weighs 0.110 g on the average. What would 78 such washers weigh? g Submit Answer b. Merchants usually sell small nuts, washers, and bolts by weight (like jelly beans!) rather than by individually counting the items. Suppose a particular type of washer weighs 0.110 g on the average. How many washers would there be in 240. g of washers? washers Retry Entire Group Show Hint [References] 9 more group attempts remaining Previous Next> Save and Exit

A cough syrup has a density of 1.20 g/mL. A doctor orders 48.0 g of the syrup for a sick child. How many teaspoons (tsp) will you administer to the child? (1 tsp = 5.0 mL). 1) 6.4 tsp 2) 8 tsp 3) 4 tsp 4) 5 tsp