Chem lab week 1-1

TRUE OR FALSE __________ 6. The bowl of the funnel for gravity filtration may be filled to the brim. __________ 7. Transfer liquids and solutions from a reagent bottle or beaker with the aid of a stirring rod. __________ 8. Never touch, taste, or smell a chemical unless specifically told to do so. __________ 9. If uncertain as to how to dispose of a chemical, dumping it into the sink followed by copious amount of water is a safe disposal procedure. __________ 10. A centrifuge machine should be balanced with an even number of centrifuge/test tubes, placed across the rotor from one another, with equal volumes of liquid.

A homogeneous mixture composed of a solute and solvent________?

a. The "grain" unit of mass is commonly used to define the amount of aspirin in a commercial tablet. What is the mass (in grams) of grain of aspirin? b. What is one of the most common non-active fillers in an aspirin tablet? 27

What is the laboratory equipment that is best suited to accurately measure large volume of liquids? Select one: a. Graduated cylinder b. Erlenmeyer Flask c. Test tube d. Beaker When measuring liquids using a dropper, the greater the surface tension and the greater the surface to which the drop adhere the smaller the drop. Select one: a. False b. True In compounding laboratory, an alternative apparatus for 1 mL pipette is Select one: a. Measuring cylinder b. Test tube c. Burette d. Dropper e. Conical flask

1. In the stone age, it took this long to cut down a tree?() 1 hour, 1 day, 1 week or 1 month?2. An Egyptian pharaoh who died in 1324 B.C. was buried with an iron head rest, bracelet, and a dagger. () King Tutankhamen, King Tutankayulatan, King tutankamin or King Tutakayun?3. motorcycle plastic hydraulic lines are made off() brated stainless steel, high carbon steel, medium carbon steel, or low carbon steel?4. This is important for products with moving parts.() Brass, platinum, Bronze or Steel5. used in the hospitals with extra chromium in it to resist the salts in body fluids.() high carbon steel, low carbon steel, stainless steel or mild steels?6. Mobile nutrients like nitrogen are found deeper into the soil profile while non-mobile nutrients like potassium and phosphorous are found at the _____ soil profile.() zero to six inches, composite sample, 24 inches, or Depth?

To make 250 ml of 100mm NaCl, weigh ______ grams of NaCl, place in a graduated cylinder, and add water to make the total volume _____ mL.

The number of elements known today is ___________.

To make a 4L of 0.5% NaCl, weigh ______ grams of NaCl, place in a graduated cylinder, and add water to make the total volume ______ mL.

Give an instance where it is allowable to ignore safety protocols. Why?       2. State the proper way of heating liquids using test tube.       3.Which is a more accurate volume-measuring instrument, a graduated pipet or a graduated cylinder?

What's the answer to all of these questions? with solutions...

P2O5 is called ________. N2O4 is called ________

Answer the following questions._____1. Which of the ff you can use for mixing liquids?a) test tube brush b) stirring rod c) analytical balance d) iron clamp_____2. Which of the ff you can NOT use to measure liquids?a) beaker b) serological pipet c) graduated cylinder d) volumetric pipette_____3. It can be used to contain samples for heating with flames >400 °Ca) test tube b) O-ring c) Bunsen burner d) crucible with cover_____4. The ff can be used for boiling a solution of salt, EXCEPTa) beaker b) Bunsen burner c) Buchner funnel d) Wire gauze____5. Which of the should be used when you want to separate OIL and WATER?a) buret b) separatory funnel c) buchner funnel d) Pasteur pipette

What types of household items are basic? why?

As a material expands its weight per unit of volume (also called density) _______ ? Group of answer choices Changes unpredictably Decreases Increases Stays the same

To make 150ml of 300mM MgCl weigh ______ grams of NaCl, place in a graduated cylinder, and add water to make the total volume _____ mL.

Burns: What is the difference between Dry & Liquid chemicals?

Dipping into health When blood pressure is measured over a 24-hour period, this is referred to as ambulatory blood pressure monitoring, three patterns arise. Here are samples of three different individual. Let's call them Dick (1), Tom (2) and Harry (3). 1 2 3 Patient's Paticnt's BP BP Palicet's Upper limit Upper limit 12 Upper lim 124 120 Lower limit Lower Lower limit Time (houn after wakening) Time (hours after awakening) Time (hours after awakenin SYSTOLIC BP (mm Hg)

After collecting all of the class data in Part IV Table E, graph mass in grams of regular cola on the y axis in and the volume of regular cola on the x axis in mL. On a separate piece of graph paper, prepare another graph using of the same type using diet cola. What is the slope of the best fit line on each graph? What does the slope represent?

For example, dimensional analysis could be used to determine the number of nickels in 3432.35 dollars. 34R5 dellar • To begin, write down the starting value, 3432.35 dollars. This can also be written as a fraction: • Next, convert dollars to cents. This conversion involves a simple conversion factor: Note that the "dollar" unit should appear on the bottom of this conversion factor, since "dollars" appears on the top of the starting value. • Finally, convert cents to nickels. This conversion also involves a simple conversion factor. This time "cents" should be on the bottom of the conversion factor, I dellar S centa since it was on top of the previous conversion factor. • Combining these expressions gives us 100 cents 1 dollar • Finally, cancel units. Since dollars are divided by dollars, and cents are divided by cents, both of these units can be canceled. Multiplying through gives the final result: 100 cents 1 dolhar 1 nickel 5 cents 3432.15 dollars 3432.35 dollars 1 nickel 68, 647…

What buret volume should be reported? Enter a value without units. 19 20 21

The beaker below BEST represents a(n) ______________. Assume the particles are surrounded by water molecules that are not shown for clarity.

1 of 22 > Line 1 6 - 4 3. Answer Bank Line 1 shows that cogs are inversely proportional to sprockets. Line 2 1 3 5 6 . 7 8 . 6. Line 1 shows that cogs are directly proportional to sprockets. Sprockets Line 2 shows that cogs are directly proportional to sprockets. Line 2 shows that cogs are inversely proportional to sprockets. 13 人tv T W. Cogs 4.

What happens when soap and vinegar are mixed, and what is the scientific reason for why? Thank you!

1. Consider the following data set. Concentration, mg/L 0.100 0.200 0.300 0.400 0.500 Write capital letters only on the space provided. 1. What is the slope? A. -0.064 B. 0.697 C. 1.429 D. -13.135 2. What is the y-intercept? A. -0.004 B. 0.004 C. 0.717 D. 10.141 3. What is the concentration of an unknown sample with an absorbance reading of 0.218? A. 0.156 B. 0.194 C. 0.242 D. 0.267 Absorbance 0.125 0.304 0.422 0.559 0.712

When measuring volumes of liquids, precision volumetric graduates with calibration for measuring multiple volumes are available, usually with inscriptions to deliver. Examples of these include the following with the exception of Select one: a. Pipettes b. Syringes c. Conical Graduates d. Burettes For solids in several pieces or powder heavier than and insoluble in water the most convenient to use is the method. Select one: a. Hydrostatic balance b. Lovi's beads c. pycnometer method d. Mohr-Westphal balance Balances not be situated in the following areas Select one: a. On flat areas b. On non-vibrating surface c. In areas of low humidity d. Areas with vents e. In areas without metal chemicals

Gravimetric means (volume measurement) of: the component to be analyzed .A True .B False .C .D

I need answer typing clear no chatgpt used i will give 5 upvotes

Guoy balance method.

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