What happens when a catalyst is added to a chemical reaction that is already in progress?

the reaction reverses

the reaction stops

the rate of the chemical reaction decreases

the reaction with the lower activation energy occurs

What type of mixture is a solution? heterogenous homogeneous none of these answers immiscible

In a college of exactly 2940 students, exactly 60 % are male. What is the number of female students?

A metal atom loses electrons from its outermost energy level and acquires a (positive) or (negative) charge. These electrons join a nonmetal atom.

Consider the combustion reaction, 2C4H2+5O 2--->4 CO2+2H2O where C2 H2 Hf = 227.4 kJ/mol), CO2 (Hf = - 393.5 kJ/mol), and H2 O (Hf = - 241.82 kJ/mol). What is the enthalpy of the reaction? -2,512.4 kJ -1,256.2 kJ 1,256.2 kJ 2,512.4 kJ

A mixture of hydrogen and oxygen gases has a total pressure of 5.50 atm. What is the partial pressure of the hydrogen if the P (O2) = 1.65 atm?

What is the temperature (in K) of 16.45 moles of methane gas in a 4.95 L container at 4.68 atm?

What do we call the process by which cells obtain the energy that they need?

Which of the following statements describes how the periodic table is organized? 1. The elements are organized alphabetically. 2. The elements are organized by their size. 3. The elements are organized by the date they were discovered. 4.

Which of the following is a mixture A aluminum B BaSO3 C Milk D table salt

Which of the following quantum number combinations is not allowed in an atom? A. n = 2, l = 1, mr = - 1 B. n = 1, l = 1, m = 0 C. n = 8, l = 5, m = - 4 D. n = 6, l = 3, m = 2