Tell how many significant figures this number contains. 0.6

1 significant figure is the Answer

Explanation:

The zeros are not trailing after the digit 6. Hence they are not significant.

Rules:  

Non zero digits are always significant.

For example 2356 has 4 significant figures

Zeros between Non zero digits are always significant.

3007 has 4 significant figures

In a decimal trailing zeros are significant.

For example 0.0003 has 1 significant figures and 0.003000 has 4 significant figures.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the answer is na (sodium)