What is the definition of physical and chemical properties of matter?

What is the second most abundant element in stars? A. iron B. helium C. oxygen D. hydrogen

A force is applied to an object on a frictionless surface. it produces an acceleration of 3m/s2. what are the possible values for the applied force and for the mass of the object? a. 2 force/N and 5 mass/kg b. 2 force/N and 6 mass/kg c.

Are nails in a jar with water a chemical change

In a reversible reaction, equilibrium is reached when The concentration of the reactants and products are equal There is no product; all reactant The concentration of the reactants and products remain constant There is not reactant; all product

How is the law of conservation of mass related to the balancing of a chemical equation?

Match the factors which affect the rate of dissolving/dissociation/diffusion.

How would the equilibrium of an exothermic reaction at 25°c be affected if the temperature of the system were reduced? (hint: apply le chatelier's principle) ?

Which is the most practical argument for the continued funding of space exploration? a) Space exploration will one day show whether life exists on other planets in star systems similar to ours.

33 protons 36 electrons 45 neutrons

The periodic table includes all of the known elements in the world. how are elements arranged on the periodic table?