Answer:
A chemical reaction occurs when a substance is rearranged to form a new substance. It is possible to identify if this has taken place from one of the five signs of chemical change. <u><em>These changes include color change, temperature change, precipitate formation, gas production and light emission.</em></u>
Explanation:
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Since Seismic waves travel at different speeds according to type, the speed of seismic waves from fastest to slowest is option C: P waves, S waves, L waves.
<h3>Which seismic waves are moving more quickly?</h3>
P waves leave the earthquake first and go the furthest. Rock oscillates perpendicular to the direction of wave propagation in S or shear waves. In rock, S waves typically move at a pace of roughly 60% that of P waves, and they always come after the latter.
Therefore, if we examine a seismogram, we anticipate that the P-wave, which is the quickest wave, will arrive first, followed by the S-wave and then the Love and Rayleigh waves, which are the slowest waves.
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Answer:
Here's what I get
Explanation:
A. Prepare Ca(NO₃)₂ solution
Scoopula — to transfer the solid to an Erlenmeyer flask
Erlenmeyer flask — to hold the solid for weighing and to prepare the solution
Volumetric flask — to hold the liquid
Funnel — to transfer the solution to the volumetric flask
Wash bottle — to fill the volumetric flask to the mark
B. Weigh K₂SO₄
Scoopula — to transfer the solid to a weighing bottle
Weighing bottle — to hold the solid for weighing.
C. Add acetic acid to a volumetric flask
Volumetric flask — to hold the acid
Pipet —to measure out the acid and transfer it to the flask
Pipet bulb — safety feature for the pipet and for control of the acid volume.
D. Add NaOH to an acid
Beaker — to hold the NaOH solution
Ring stand — to hold a buret
Buret clamp — to hold the buret
Funnel — to transfer the solution to a buret
Buret — to hold the NaOH solution for addition to the acid
Assuming that the ammonium sulfide formula is (NH4)2<span>S then you can see that there are 2 nitrogen, 8 hydrogen and 2 sulfur atoms for every ammonium sulfide. If the amount of ammonium sulfide is 8.9 moles, then the number of hydrogen atoms should be: 8/1 * 8.9 mol= 71.2 moles.
If you are asked the number of individual atoms you need to multiply it with Avogadro number like this : </span>71.2 moles * 6.02 * 10^23= 4.28 *10^25