2g of limestone sample (containing CaCO3 as the base substance ) was dissolved in a 50cm³ of 1.0M HCI. the resulting solution was made up to 250cm³ with water. 25cm³ of this solution required 11.6cm³of 0.1M NaOH for nuetralisation. calculate the CaCO3 present in the lime stone sample. ( Note ratio of HCI to CaCO3 from the balanced reaction equation is 2:1)

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.