Chemistry, 26.11.2021 18:40 cutiecat66
A centrifuge was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used? ( not heterogenous)
It was a pure substance.
It was a compound.
It was a homogeneous mixture
Answers: 3
Chemistry, 21.06.2019 23:00
Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.
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Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 14:30
What type(s) of intermolecular forces are expected between ch3ch2cooh molecules? dipole forces, induced dipole forces, hydrogen bonding
Answers: 1
A centrifuge was used to separate a sample into its components. What conclusion about the sample can...
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