Which types of changes observe the law of conservation of mass?

a. only changes of state

b. only physical changes

c. only chemical changes

d. all of the above

Consider the reaction between hcl and o2: 4hcl (g) + o2 (g) →2h2o (l) + 2cl2 (g) when 63.1 g of hcl are allowed to react with 17.2 g of o2, 59.6 g of cl2 are collected.

How many moles of oxygen are needed to react with 7.5 moles of aluminum?

Which statement is true? A. Rocks do not contain any mineral matter. B. Most rocks are composed of single mineral. C. Most rocks are made up of a mixture of minerals.

Microspheres can form when a mixture of what substances isagitated (mixed up/shaken) ?

How many moles are in 50.15 g of mercury

Which part of the body does colchicine affect the most

Balance and identity the type of chemical reactions. Mg (s) + HNO3 (aq) - > H2 (g) + Mg (NO3) 2 (aq)

Which radioactive element is used to determine the absolute age of late pleistocene animal remains?

Compare the practical uses and limitations of nuclear fission and fusion. Include in your answer a detailed description of the two processes, comparing and contrasting them in terms of the types of atoms involved, the conditions needed to get the

Why can two igneous rocks have the same minerals but different names?