In order to model a chemical change in the laboratory, a student wants to select the appropriate measuring apparatus to record the reaction. Which apparatus could be used to detect that c chemical change occurred with a substance in laboratory setting? Select ALL
that apply.
图 40
A)
B)
The student could use a hand lens to see if the original substance had been
crushed into smaller particles.
The student could perform an odor test to detect if a new smell emerges
from the interaction of the substance in the lab.
The student could test whether a gas was released during the interaction
of the substance with another substance in the lab.
The student could use a spatula to determine if a precipitate/solid formed
at the bottom of the beaker containing the substance,
The student could use a balance and a volumetric flask to determine the
lass and volume of the substance in order to determine its density
D)
E
E)

a. a clone will be physically identical to the original, but won’t be genetically identical

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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

the ratio of the conjugate base to the acid required to attain the desired ph.