primary consumers
tertiary consumers
decomposers
B.there is meat next to the cheese in the refrigerator
C.a boy waits five minutes to talk to his father
D.the mother takes her medication everyday at seven
b. carbon
c. sodium
d. iodine
The answer to your question is
d. idoine
B. the temperature
C. the concentration of reactants
D. all of the above
The following that affects the rate of a chemical reaction is the presence of catalyst, temperature, and concentration of reactant. The correct option is D.
The rate of reaction is the speed of the reaction at which a reaction takes place.
The catalyst increases the rate of reaction.
The increase in temperature increases the rate of reaction.
Thus, the correct option is D. all of the above.
Learn more about the rate of a reaction
B) The smallest unit of P4.
C) The smallest unit of NH3.
D) The smallest unit of H2O.
Answer:
Option A
Explanation:
An atom is the smallest particle of a chemical element that can exist.
Using the method of elimination;
Option A - This correct because an atom is the smallest unit of a chemical element ( Neon). It fits the definition given above.
Option B - This option is wrong because P4 is a substance that is made up of four atoms of the same element, so it is a molecular element and not an atom.
A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.
Option C - This option is wrong because NH3 is a compound containing two different elements.
Option D - This option is wrong because H2O is a compound containing two different elements.