A + ESSE NTIALS

You add tea to a glass of hot water. A number of changes can be observed, we will call these "macroscopic" observations. Which of these changes can you observe? - Correct Answer Getting cooler, color, smell There are also submicroscopic changes taking place in the teas. These cannot be detected with any of our five senses, but given the macroscopic changes we have seen, and our hypothesis about the structure of matter, we might be able to surmise what is happening. Which of the following ...

Which inter-molecular attraction is found in all molecules - Correct Answer London Dispersion Convert 45C to degrees Kelvin - Correct Answer 318K What type of solid structure do most ionic compounds have? - Correct Answer crystalline What is true according to the kinetic-molecular theory of gases? - Correct Answer A gas consists of many particles (atoms or molecules) moving about at random The average kinetic energy of gas particles is proportional due to their Kelvin temperatu...

Pure substance and mixtures - Correct Answer two categories all matter is broken into Elements and compounds - Correct Answer two categories of pure substances Homogeneous and heterogeneous - Correct Answer two categories of mixtures compound - Correct Answer can be broken down into simpler means by chemical means homogeneous mixture - Correct Answer appears same throughout heterogeneous mixture - Correct Answer 2+ visually distinguishable phases atoms - Correct Ans...

Supernatant - Correct Answer a liquid lying above a sediment (floating on the surface) Tare - Correct Answer counterweight consisting of an empty container that is used as a counterbalance to obtain net weight Filtrate - Correct Answer the product of filtration Molecular Formula - Correct Answer a chemical formula based on analysis and molecular weight Empirical Formula - Correct Answer a chemical formula showing the ratio of elements in a compound rather than the total num...

The Metric prefix kilo- has a decimal equivalent of - Correct Answer 1 000 ______ is a measure of how close the value of a measurement agrees with a known or accepted value - Correct Answer Accuracy ______ is the determination of the reproducibility of a measurement - Correct Answer Precision To measure the length of an object, the equipment used would be a - Correct Answer meterstick Using significant figure rules, the correct way to express 2.76 x 1.2384 is - Correct Answer...

Determine when you should remove your goggles in the lab room. - Correct Answer When everyone in the room is done handling any chemicals or glassware Determine the safest option in the lab if you need your vision to be corrected. - Correct Answer Wear corrective glasses or lenses under your safety goggles for the whole experiment, but always check with your TA or Instructor for your school's policy Determine when to put on disposable gloves for work in the lab. - Correct Answer Befo...

Answer the mass contained in the material per unit volume Derived quantity - Correct Answer taking its unit from the mathematical relationship Density formula - Correct Answer Density= mass (g) volume (cm^3) How to find mass? - Correct Answer weighing the material on a balance "weight" - Correct Answer the gravitational attraction for the matter "Mass"-"Weight" - Correct Answer "mass" of the material is equivalent to the "weight" of the object on Earth at se...

Beaker - Correct Answer Glassware that measures volume in milliliters (mL). Burette - Correct Answer Glassware that measures volume in milliliters (mL), numbers are in the opposite direction (0 at the top, 100 at the bottom), used for titration, read to the hundredths place. Erlenmeyer Flask - Correct Answer Glassware that is usually used for titration collection due to its lack of spilling. Volumetric Flask - Correct Answer Glassware that is calibrated to a specific volume, usu...

Solids - Correct Answer Atoms closely packed together Liquids - Correct Answer Have volume but no shape Gases - Correct Answer Are highly dispersed Sand is coarse (Physical or chemical property) - Correct Answer Physical Fruit easily turns brown when exposed to air (Physical or chemical property) - Correct Answer Chemical Sugar mixes very well with coffee (Physical or chemical change) - Correct Answer Physical Gaseous vapor observed when handling dry ice (Physical o...

Balance - Correct Answer Used for measuring mass Beaker - Correct Answer Used to hold,mix, and heat liquids Ring Stand - Correct Answer Used to hold or clamp laboratory glassware and other equipment in place, so it does not fall down or come apart. Scoopula - Correct Answer Used to transfer solids Beaker Tongs - Correct Answer Used to pick up beakers Striker - Correct Answer Used to light a Bunsen burner. Bunsen burner - Correct Answer Frequently used as a heat so...