Carry out these steps, and record your findings in the table. 1. Pour water to the 2.0 mL mark in the graduated cylinder. If you look at the graduated cylinder from the side, you will see the water forms a curve. Make sure the bottom of the curve is at the 2.0 mL mark. 2. Use the gram scale to measure the mass of the graduated cylinder and 2.0 mL of water. Record the mass in the table. Calculate the mass of 2.0 mL of water by subtracting the mass of the graduated cylinder. 3. Repeat this process to find and record the mass of 4.0 mL of water and then 6.0 mL of water. 4. Density is mass in grams divided by volume in cubic centimeters (cm). 1 mL is equal to 1 cm. Calculate and record the density of water. BI U X X, Font Sizes Volume of Water Mass of Graduated Cylinder and Water Mass of Water Density 20 ml 4.0 mL O 6.0 mL

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.

they are made of gases.

they have a spherical shape.

they make energy through fusion.

answerleaving cheese out to get moldy;

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol