State whether true or false a. The substances which have very high ignition temperature will catch fire easily
.b. Spontaneous combustion happens when we provide external heat.
c. Metal oxide is basic in nature and non-metal oxide is acidic in nature. d.Copper displace zinc from its salt solution
.e. Charges of the same kind repel each other, while charges of different kinds attract each other
.f. A metal rod can be charged by friction.

Which of the following statements is true? question 4 options: nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not. neither chemical reaction rates nor nuclear decay rates vary with the conditions of the reaction. both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction.

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?