Which statement about elements is false? a. the same kind of atoms exist in an element. b. there are about 1,000 elements found in nature. c. some elements have been made in laboratories. d. zinc, copper, and iron are elements.

The correct answer is B. There are about 1,000 elements found in nature.

Explanation:

In chemistry, an element refers to a substance that contains the same kind of atoms, especially in terms of the number of protons. Examples of elements include substances like hydrogen, nitrogen, sodium, zinc, among others. Additionally, to 2019 scientists have identified around 118 elements that include both elements naturally formed and some that were created in laboratories such as the meitnerium that was created in 1982. According to this, it is false there are about 1000 elements because for now there are only 118.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.