Questions and Answers of Cambridge International AS And A Level Chemistry

A beam of electrons is passing close to a highly negatively charged plate. When the electrons pass close to the plate, they are deflected (bent) away from the plate. a. What deflection would you
Use the information in the table to deduce the number of electrons and neutrons in a neutral atom of:a. Vanadiumb. Strontiumc. Phosphorus. Atom Nucleon number Proton number vanadium 51 23 strontium
Zirconium, Zr, and hafnium, Hf, are metals. An isotope of zirconium has 40 protons and 91 nucleons.a. i. Write the isotopic symbol for this isotope of zirconium. ii. How many neutrons
Use the Periodic Table shown below to help you. Write isotopic symbols for the following neutral atoms:The Periodic Table of the Elementsa. Bromine-81b. Calcium-44c. Iron-58d. Palladium-110. Group 1
a. Describe the structure of an atom, giving details of the subatomic particles present.b. Explain the terms atomic number and nucleon number.c. Copy and complete the table:d. Explain why atoms are
Deduce the number of electrons in each of these ions:a. 4019K+b. 157N3–c. 188O2–d. 7131Ga3+
The symbols below describe two isotopes of the element uranium. 23592 U 23892 Ua. State the meaning of the term isotope.b. i. In what ways are these two isotopes of uranium
The table below shows the two naturally occurring isotopes of chlorine. a. Copy and complete the table. b. The relative atomic mass of chlorine is 35.5. What does this tell you about the
a. Sodium reacts with excess oxygen to form sodium peroxide, Na2O2.2Na + O2 → Na2O2Calculate the maximum mass of sodium peroxide formed when 4.60 g of sodium is burnt in excess oxygen. (Ar values:
In this question give all answers to 3 significant figures. The reaction between NaOH and HCl can be written as:HCl + NaOH → NaCl + H2OIn such a reaction, 15.0 cm3 of hydrochloric acid was
56.2 g of silicon, Si, reacts exactly with 284.0 g of chlorine, Cl2, to form 340.2 g of silicon(IV) chloride, SiCl4. Use this information to calculate the stoichiometry of the reaction. (Ar
50 cm3 of a gaseous hydride of phosphorus, PHn reacts with exactly 150 cm3 of chlorine, Cl2, to form liquid phosphorus trichloride and 150 cm3 of hydrogen chloride gas, HCl.a. How many moles of

Showing 500 - 600 of 512

1
2
3
4
5
6