Which do all groups of plants have these are the choices A.chloroplasts B.roots C.spores D.tubes

Answer:

MgCl₂ = 94 g

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

Chemical equation:

MgCl₂ + Li₂CO₃  → MgCO₃ + 2LiCl

 ?        +    75 g  =    135 g + 34 g

The mass of reactant and product must be equal. That's why,

135+ 34 = 169 on product side

94 + 75 = 169 on reactant side

MgCl₂ + Li₂CO₃    →    MgCO₃ + 2LiCl

  94    +    75 g     =    135 g + 34 g

      169 g             =        169 g

Answer:

The subscripts in a chemical formula represent two things:

Explanation:

The subscripts in a chemical formula represent two things:

1. The number of atoms: The subscripts indicate the number of atoms of each element present in a compound. For example, in the chemical formula H2O, the subscript "2" indicates that there are two hydrogen atoms in each water molecule.

2. The number of molecules: The subscripts can also represent the number of molecules in a compound. However, it's important to note that this is not always the case. In most cases, the subscripts in a chemical formula specifically indicate the number of atoms rather than the number of molecules.

To clarify the examples given:

- The statement "★ the number of atoms" is correct. Subscripts in a chemical formula do represent the number of atoms.

- The statements "★ C = 1, H = 6, O = 5" and "★ C = 6, H = 6, O = 1" are not relevant to the question as they do not pertain to the role of subscripts in a chemical formula.

Not sure what the question is, but a standard sodium atom has 11 protons, 11 electrons, and 12 neutrons with an atomic mass of 23. A sodium atom with a mass number of 24 probably has 13 neutrons.

Radioactive isotopes last for less time, is the one among the following choices given in the question that shows the way a radioactive isotope and a stable isotope differs