Which statement is true about a reversible reaction?

it has equal mass of all reactants.
it produces salts from acids and bases.
it has equal number of products and reactants.
it results in an equilibrium mixture of reactants and products.

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

How does the viscosity of magma change as magma cools?