Question 2 classify each chemical reaction: reaction type of reaction (check all that apply) →+4naso2g2na2os combination precipitation single replacement combustion double replacement acid-base decomposition →+naohaqhbroaq+nabroaqh2ol combination precipitation single replacement combustion double replacement acid-base decomposition →+cuso4aqzncro4aq+znso4aqcucro4s combination precipitation single replacement combustion double replacement acid-base decomposition →+kohaqhclo4aq+kclo4aqh2ol combination precipitation single replacement combustion double replacement acid-base decomposition

answer is a

explanation:

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.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.