Chemical reactions can be detected by changes in:

a. temperature

b. color

c. overall mass of the products compared to the mass of the reactants

d. density of the products compared to the reactants

Which of the following is true for compounds? They can be separated into their component elements through physical means. They can be created by chemical reactions. They can consist of no more than two types of elements.

In most food webs there are many producers, fewer herbivores, and even fewer carnivores. Which statement best explains why there are always fewer carnivores than producers in a food web? A. There is not enough space to illustrate them. B.

Which choice best names the type or types of rock that can become metamorphic rock? A) Metamorphic and igneous rocks B) Only sedimentary rocks C) Igneous and sedimentary rocks D) Igneous, sedimentary, and metamorphic rocks

If uranium-235 is bombarded with a neutron, it will temporarily become uranium-236 lead-235 plutonium-236

Identify the principal role of cellular respiration. to convert solar energy into the chemical energy of sugars to convert the chemical energy of sugars into heat to maintain an elevated body temperature to convert kinetic energy into the chemical

What kind of reaction occurs when you mix aqueous solutions of barium sulfide and sulfuric acid?

What is true about empathy? Most anyone can learn this skill. Not everyone can learn this skill. It is a desirable attribute. choices A and C

What effect can new observations have on a scientific theory

The total number of valence electrons in the phosphate ion is

The reaction below has an equilibrium constant kp=2.2*106 at 298 k. 2cof2 (g) ⇌co2 (g) + cf4 (g) calculate kp for the reaction below. cof2 (g) ⇌12co2 (g) + 12cf4 (g)