What precision of measurement can be expected from a multiple beam balance or a platform balance and from a digital balance? what precision of measurement can be expected from a 100-ml graduated cylinder and from a 100-ml beaker? explain how you arrived at your answers.

Among the instruments, both multiple beam balance and digital scale are used for the measurement of a solid and can be highly precise or consistent.  The multiple beam balance uses counterweights to determine the weight of the sample placed on a weighing pan.  It is the least accurate way of measurement since the readings do not include a decimal place. On the other hand, the digital scale is highly accurate and more precise than the multiple beam balance because it shows digits which are significant. However, the last possible decimal may be uncertain since it is probably estimated.

A 100-mL graduated cylinder is more accurate and moderately precise than a 100-mL beaker since the cylinder has lines between every whole number which indicate the decimal while the beaker hasn’t. 

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

i'm pretty sure it is letter c.) car