Calculate the volume 3.00 moles of a gas will occupy at 24.0 °C and 101.3 kPa. 2. How many moles of gas would be present in a gas trapped within a 100.0 mL vessel at 25.0 °C at a pressure of 2.50 atmospheres? 3. If the number of moles of a gas are doubled at the same temperature and pressure, will the volume increase or decrease?
State the place value of the underlined digit in 6 953 742. A Hundreds C Ten thousands B Thousands D Hundred thousands ( 3. Round off 5 987 341 to the nearest hundred thousand. A 5.8 million C 6.0 million ( B 5.9 million D 6.1 million 4. Which of the following numbers, when rounded off to the nearest thousand, becomes 7 541 000?
The angle of the drop height was at 90 degrees and the length of the string was at 300 mm. Size of Mass ( grams) | Trial 1 (seconds) | Trial 2 (seconds) | Trial 3 (seconds) | Average (seconds) | Period (seconds) | 10 grams | 25.00 seconds | 24.90 seconds | 25.21 seconds | 25.04 seconds | 1.252 seconds | 100 grams | 25.86 seconds | 25.93 seconds | 25.81 seconds | 25.87 seconds | 1.2935 seconds | 500 grams | 26.53 seconds | 26.30 seconds | 26.44 seconds | 26.42 seconds | 1.321 seconds | 1,000 grams | 25.82 seconds | 26.46 seconds | 25.91 seconds | 26.06 seconds | 1.303 seconds | 4.) Angle or Drop Height: Hypothesis: I predict that the larger the angle of drop, the longer period of the pendulum. The independent variable is the drop height. The mass of the pendulum was 100 grams and the string measured 300 mm.
A divide by 100 B divide by 1000 C multiply by 100 D multiply by 1000 15 Which of the following is the smallest? A 0.07 7 C ----10 1 B -7 D 73% 7 A ----12 7 C ----16 7 B -9 7 D -8 5 Which one of these decimals could be rounded to 34.71? A 34.715 B 34.7 C 34.707 D 34.7039 1 6 What is -- as a percentage? 6 A 16% B 1.6% -C 16 2 % 3 D 60% 7 What is 37.5% of one day? A 10 hours B 8.6 hours C 9.6 hours D 9 hours 8 Increase $38 by 15%.
If p is the product of integers from 1 to 30, inclusive, what is the greatest integer k for which 3k is a factor of p? u. 10 v. 12 w. 14 x. 16 y. 18 7.
a. 1200.0 b. 8.00 c. 22.76 x 10-3 d. 731.2204 Question 3 Which value has more significant figures? 2.63 x 10-6 or 0.0000026 Question 4 Express 4,610,000 in scientific notation. a. with 1 significant figure b. with 2 significant figures c. with 3 significant figures d. with 5 significant figures Question 5 Express 0.0003711 in scientific notation.
* Trial 1 37.00(g) – 26.10(g) = 10.90(g) * Trial 2 36.70(g) – 26.15(g) = 10.55(g) * Trial 3 36.10(g) – 26.05(g) = 10.05(g) 2. Calculate the density of the unknown liquid for each trial. (Divide the mass of the liquid calculated above by the volume of the liquid.) * Trial
Name: Anh Lan Do Course: CHE-131-92L Date: Feb 24th, 2010 General Chemistry 1 Experiment 4 Percent Composition of a Compound Professor Robert M. Cady Questions: 1. According to the law of definite composition, elements form compounds in the same ratios by mass each time the compound is produced. Using the theoretical percent by mass of magnesium in MgO, calculate the mass of oxygen that will combine with 12.25g of Mg and the mass of MgO that will be formed. 2. Which compound has the greatest percentage by mass of Magnesium?
(c) If you wanted 95 percent of the kernels to pop, what time would you allow? (d) If you wanted 99 percent to pop? A) 2 minutes = 120 seconds z(120) = 120-150)/25= -30/25 = -6/5= -1.2 P(z>-1.2) = 0.1151 B) 3 minutes = 180 seconds z(180) = (180-150)/25=30/25 = 6/5 = 1.2 P(z>1.2) = 0.1151 C) If you want 95% of the kernels to pop, what time would you allow? (.95) = 1.645 x-150 = 25*1.645 x = 41.12 = 150= 191.12 seconds x = 3 minutes and 11.12 seconds D) If you want 99% to pop… (.99) = 2.326 2.326 = (x-150)/25 x = 25* 2.326 + 150 x= 208.16 seconds x = 3 minutes and 28.16 seconds 8.46 A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale.
(1) 2. The temperature of a 2.0 g sample of aluminium increases from 25°C to 30°C. How many joules of heat energy were added? (Specific heat of Al = 0.90 J g−1K−1) A. 0.36 B.