Chemical formulae and conservation of mass

Chemistry

Atomic structure and the periodic table

How many atoms of sulfur are present in the formula below?

the number of atoms in the reactants is always more than the number of atoms in the products.

the number of atoms in the reactants is equal to the number of atoms in the products.

the number of atoms/mass of reactants can be more or less than the atoms/mass of the product.

the total mass of the reactants is equal to the total mass of the products.

the total mass of the reactants is more than the total mass of the products.

The law of conservation of mass states ...

20 g of oxygen reacts with 15.5 g of lithium. How many grams of lithium oxide are produced?

decrease because one of the reactants was a gas.

increase because one of the reactants was a gas.

Aluminium oxide breaks down into aluminium and oxygen. If the reaction takes place on a balance, the mass appears to...

A substance contains one silicon atom, three hydrogen atoms and three oxygen atoms. The hydrogen and oxygen form hydroxide ions. What is the correct formula?

What is the correct balanced equation for iron (Fe) reacting with oxygen to form iron oxide?

What is the chemical formula for carbon dioxide?

There are two potassium atoms, four sulfur atoms and four oxygen atoms.

There are two potassium atoms, one sulfur atom and four oxygen atoms.

There is one potassium atom, one sulfur atom and four oxygen atoms.

There is one potassium atom, two sulfur atoms and four oxygen atoms.

Which statement is correct about the formula below?

Matter can be solid, liquid or gas. Oxygen is a {{}} at room temperature.

How compact the particles are within the object.

The force acting on the object due to gravity.

The measure of the amount of matter in the object.

100 g of ice cream melts. What is the mass of the liquid ice cream?

60 g of calcium reacts with 50 g of oxygen. How many grams of calcium oxide are produced?

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