Which of the following statement is false about doulple-beam spectrometer instrument? 1-An advantage is that it can modulates and compensates for instantaneous source power change.
2-Reference beam will show a higher intensity than sample beam
3-Same range of wavelengths can be used, compared to the single-beam spectrometer.
4-The two beams, after passing through the respective sample/reference, are compared Moving to the next question prevents changes to this answer.

passing a magnet thought the

mixture , because iron gets attracted to magnet .

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.