Select all that apply.

when a double displacement reaction takes place, one of the products must be

a precipitate
a gas
water
a salt

The main products must be obtained during double displacement reaction are a precipitate and a gas

Option: A and B

Explanation:

"Double displacement reaction" is one of the types of chemical reactions. It is a process in which one component each of both the reacting molecules get exchanged to form the products which is precipitate obtained from mother liquor while rest is filtrate. Following is the reaction:

A Chemical bond responsible for holding the product as such may be covalent or ionic. Also called as "salt metathesis reaction" or double decomposition reaction. One of the examples are as follows where "aqueous solution" of silver nitrate is combined with sodium chloride and result in a curdy "white precipitate" of silver chloride:

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

im not exactly sure but i think its b!