Answer:
It is negative because the enthalpy of the products is greater than the enthalpy of the reactants.
Answer:
4.427 × 10⁵
Explanation:
In mathematics, rounding up a number is a way to get a more simpler figure but not too distant from the original number. Rounding up a whole number like this (442722) to significant figures means having only four non-zero digits in the figure i.e. 442722 ~ 442700.
This means that 442722 has been rounded up to 4s.f. Hence, to use scientific notations to represent our answer, we count the number of decimal places from right to left i.e.
442700 = 5 decimal places if the point is between 4 and 4 i.e. 4.427
Therefore, the figure 442700 can be written as 4.427 × 10⁵ using scientific notation.
Answer:
Yes an instant cold pack is a perfect example of an endothermic reaction.
Explanation:
They are endothermic because they absorb heat energy from their surroundings. This means that the surroundings of endothermic reactions are colder as a result of the reaction.For example melting ice is a type of this reaction
Answer:
Chernobyl Accident 1986. The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the atmosphere and downwind – some 5200 PBq (I-131 eq).
Explanation:
Answer: Alkanes undergo a substitution reaction with halogens in the presence of light. ... This reaction is a substitution reaction because one of the hydrogen atoms from the methane is replaced by a bromine atom
Explanation: