True.
Polyhedrons are closed figures which are bounded by polygons such as cube, prism, pyramids.
Non-polyhedrons are solid figure which have sides but are not polygons such as sphere, cone and cylinder.
Please see the attached figure for polyhedron:
Hence, the given statement is true i.e. other polyhedrons are present other than prisms and pyramids.
Answer:
1 significant figure:
1000
2 significant figures:
670
0.0093
3 significant figures:
0.184
1.30
4 significant figures:
120.9
1.008
Explanation:
The significant figures of a number written in positional notation are digits that carry meaningful contributions to its measurement resolution. This includes all digits except: all leading zeros.
5 Rules for significant figures:
1: All non-zero numbers ARE significant.
2: Zeros between non-zero numbers ARE significant.
3: Leading zeros are NOT significant.
4: Trailing zeros to the right of the decimal ARE significant.
5: Trailing zeros in a whole number with the decimal shown ARE significant.
Look at the attachments for more examples.
Hope this helps:))
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Answer : Both solutions contain molecules.
Explanation : The number of molecules of 0.5 M of sucrose is equal to the number of molecules in 0.5 M of glucose. Both solutions contain molecules.
Avogadro's Number is = which represents particles per mole and particles may be typically molecules, atoms, ions, electrons, etc.
Here, only molarity values are given; where molarity is a measurement of concentration in terms of moles of the solute per liter of solvent.
Since each substance has the same concentration, 0.5 M, each will have the same number of molecules present per liter of solution.
Addition of molar mass for individual substance is not needed. As if both are considered in 1 Liter they would have same moles which is 0.5.
We can calculate the number of molecules for each;
Number of molecules = ;
∴ Number of molecules = which will be =
Thus, these solutions compare to each other in that they have not only the same concentration, but they will have the same number of solvated sugar molecules. But the mass of glucose dissolved will be less than the mass of sucrose.