Answer: it provides an objective standardized approach to conducting experiments and in doing so improves their results.
Explanation: the scientific method attempts to minimize the influence of bias or prejudice in the Expirimenter. Even the best intention scientists can't escape bias that's the job for the scientific method.
A factory at a low elevation ships bags of popcorn to cities at high
elevations. The factory manager need to monitor the amount of air in each bag
because when the bags of popcorn are delivered into high elevation cities, it
will shrink due to the high pressure exerted by the surroundings towards the
bag. As the elevation increases, the pressure surrounding it also increases.
Answer:
Mass = 2.12 g
Explanation:
Given data:
Volume of sodium chloride solution = 30 mL (30/1000 = 0.03 L)
Molarity = 1.2 M
Grams of sodium chloride = ?
Solution:
Molarity = number of moles / volume in litter
Number of moles = Molarity × volume in litter
Number of moles = 1.2 M × 0.03 L
Number of moles = 0.036 mol
Mass in grams:
Mass = number of moles × molar mass of sodium chloride
Mass = 0.036 mol × 58.5 g/mol
Mass = 2.12 g
Answer:
- <em><u>A physical change has occurred, with no energy change.</u></em>
Explanation:
When a pencil lead is broken there is not change of any chemical properties, therefore it is not a chemical change, but just a physical change. In this case the change is just the number of pieces and dimensions.
Chemical changes always involve the formation of new different substances; the bonds between the atoms of the starting substances (reactants) breake and new bonds are formed leading to new substances (products) with different chemical composition (arrange of atoms). Chemical changes occur through chemical reactions.
Hence, if there is not change on the chemical composition, you think on physical changes. Physical changes include change in shape, size, state of matter (e.g. solid, liquid, gas). In the case of a pencil lead breaking, it is a change in shape and size.
Also, since energy has not been absorbed or released during the change, the energy of the pencil lead before having been broken is equal to the sum of the energies of the pieces of pencil lead obtained. So, this is a physical change with no energy changes.
Some examples of physical changes that include change in energy are the change of state (e.g. solid to liquid or liquid to gas) and the dissolution of a compound.
Yes if a molecule with a COOH group is called a carboxylic acid.
hope that helps