I’m not sure if this will help, but protons make different elements. That’s how we can tell the difference between elements!
Answer:
Explanation:
1. Find the order of reaction
Use information from the graph to find the order.
If a plot of ln[A] vs time is linear, the reaction is first order and the slope = -k.
2. Find the half-life
Answer:
Percent Composition of Compounds
The percent composition (by mass) of a compound can be calculated by dividing the mass of each element by the total mass of the compound.
LEARNING OBJECTIVES
Translate between a molecular formula of a compound and its percent composition by mass
- The atomic composition of chemical compounds can be described in a variety of ways, including molecular formulas and percent composition.
- The percent composition of a compound is calculated with the molecular formula: divide the mass of each element found in one mole of the compound by the total molar mass of the compound.
- The percent composition of a compound can be measured experimentally, and these values can be used to determine the empirical formula of a compound.
- percent by mass: The fraction, by weight, of one element of a compound.
- The atomic composition of chemical compounds can be described using a variety of notations including molecular, empirical, and structural formulas. Another convenient way to describe atomic composition is to examine the percent composition of a compound by mass.
- Percent Composition by Mass
Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.
Explanation:
I hope it's help
Answer:
a) False
b) True
c) False
d) False
e) True
f) True
Explanation:
a) In thin layer chromatography, a polar organic compound will be repelled by the adsorbent and therefore travel not as far up the plate than a non-polar compound. FALSE. The adsorbent usually is a polar compound that will attract the polar organic compound.
b) In thin layer chromatography, a polar organic compound will be attracted by the adsorbent and therefore travel not as far up the plate as a non-polar compound. TRUE. The polar organic compound will be attracted by the adsorbent doing its travel not as far.
c) Sample spots should be approximately 1 cm in diameter. FALSE. Sample spots must be of 1-2 mm of diameter.
d) Covering the sample jar is done to prevent fingerprints on the slide. FALSE. The covering is doing to saturate the jar's air with solvent.
e) The Rf value will change if the adsorbent material is changed. TRUE. The travel of the compound depends of the retention that is made by the adsorbent material.
f) Thin layer chromatography is an example of adsorption chromatography, and not partition chromatography. TRUE. The mechanism of separation in thin-layer chromatography is differences of adsorption from different compounds.