ΔΙΛΛΛΛΛΛΛΛΛΛΛ Part 3: Convert units of time. In chemistry, time is usually reported in units of seconds (s), minutes (min), and hours (hr). Use the conversion factors to change from one unit of time to another unit of time. Seconds → Minutes Seconds Hours Minutes →→ Hours 10. Convert 35 minutes to hours 11. Convert 240 seconds to minutes 12. Convert 2.33 minutes to seconds 13. Convert 1.80 hours to seconds 60s= 1 min 3600s= 1 hr 60 min = 1 hr

Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 5.27 g/cm3, 5.28 g/cm3, 5.27 g/cm3, and 5.29 g/cm3. Bud's calculated average density was 5.28 g/cm3. Independent studies found the correct density to be 4.75 g/cm3. Which of the following statements represents the best analysis of the data?     Bud's results have much greater accuracy than precision   Bud's results have low accuracy and low precision   Bud's results have high accuracy and high precision   Bud's results have much greater precision than accuracy

A Part A Planet X rotates in the same manner as the earth, around an axis through its north and south poles, and is perfectly spherical. An astronaut who weighs 943.0 N on the earth weighs 910.0 N at the north pole of Planet X and only 850.0 N at its equator. The distance from the north pole to the equator is 18,850 km, measured along the surface of Planet X. How long is the day on Planet X? Express your answer in hours. ΜΕ ΑΣΦ t = Submit Request Answer Part B ? h If a 45,000 kg satellite is placed in a circular orbit 4000 km above the surface of Planet X, what will be its orbital period? Express your answer in seconds. VAZO ΜΕ ΑΣΦ ? T = Submit Request Answer S

1. In the olden days, US minted pennies were pure copper, but copper got so expensive that a pure copper penny was worth more than I cent. Modern pennies are composed of zinc and coated with copper. A student determines the mass of a penny to be 2.482 g. After making several scratches in a penny, the student puts the penny into hydrochloric acid, where the zinc (but not the copper) reacts with hydrochloric acid via a single replacement reaction. The hydrogen is collected at 25°C over water. The collected gas occupies 0.899 L at a total pressure of 791 mm Hg. A. Calculate the moles of hydrogen produced in the reaction. (Hint: Use the Table 1. to determine the vapor pressure of water and assume that all of the zinc in the penny dissolves.) B. Write a balanced chemical reaction for zinc and hydrochloric acid. C. Use stoichiometry to calculate the mass of zinc in the penny. D. Determine the percent zinc (by mass) in the penny.

how do i set up the math

How many significant figures are in 3.05481727x10^4?

1 in = 2.54 cm, exactly 60 min = 1 hr, exactly 12 in = 1 ft, exactly 60 s = 1 min, exactly 4 qt = 1 gal, exactly 1 gal = 3.7854 L 1 BTU = 1055 J 1 lb = 453.6 g 1 mile = 1.609 km The U.S. quarter (25 cents) has a mass of 5.67 g and is about 1.55 mm thick. How many quarters are in a stack that is 1.75 ft high? Put your answer in the area provided, followed by "see upload." Conversion factors that you might find helpful are shown. Other conversion factors such as metric multipliers are not shown, as you are required to know them.

0.161 STARTING AMOUNT 0.161 km km + 10€ SHSSFE生 0.1 A city block is 0.161 km long. How many cm is this? 0.0161 0.000161 16100 161 0.001 0.00161 km 10 m 0.01 1 cm 1610 10€ 0.161 1000 100 16.1

You are on a road trip. Your car travels at an average speed of 65 miles/hr, with an average gas use of 17.8 km/L.       1 liter = 1,000 mL = 0.264 gallons. 1 km = 0.621 miles.  1) If your trip takes 2.6 hours, determine how many total liters and gallons of gasoline are used on this trip. 2) How many mL (milliliters) of gasoline are used by the car each minute during this trip? 3) The density of the gasoline used on your trip is 0.755 g/mL. What is the total mass in grams, and in ounces of the gasoline used on your trip?

Identify the physical change from the list below: 1) Grinding coffee 2) Baking cake 3) Converting water to hydrogen and oxygen 4) Digesting a cheeseburger 5) Burning coal