1how is the density of a substance calculated?
well you need a formula. the formula is length x width x height..
2 if the shape of an object is irregular, like a stone, how can you measure its volume?
ugh its so cold in my house omg my toes are numb somone warm up
3 if the volume of a cube of wood is 15.625 cm3 and its mass is 10.00 g, show the calculation for the density of the wood.

4 based on the density of the wood that you calculated above, would the wood float or sink if it is placed in a bowl of water? explain your answer. remember that the density of liquid water is 1.00 g/cm3.

5 a marble or small sphere, made of stone, is found to have a mass of 3.05 g. to find its volume, it is placed in a graduated cylinder that originally contains 10.00 ml of water. when the marble is placed in the graduated cylinder, the new volume of the water and marble together is 11.20 ml.
¥ a. calculate the volume of the marble (be sure to include units).

¥ b. calculate the density of the marble (be sure to include units).

me!

c. 75.7

i think that is the right

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

the pseudoscience are like beliefs, theories, or like practices that are considered scientific