Which is most likely true about electronegativity?

a. it tends to be the same across a period

b. it tends to be the same down a group

c. it tends to increase across a period

d. it tends to increase down a group

What is Grxn for the equation below? NaOH (aq) + HCl (aq) H2O (l) + NaCl (aq) -82.5 kJ -29.7 kJ 26,500 kJ 27,000 kJ

What is the same about all atoms of one element

When a pure substance was heated a chemical reaction occurred, and a student obtained another solid and a gas, each of which was a substance?

Which is a law and which is a theory 1. Plate Tectonics 2. For every reaction, there is an equal and opposite reaction 3. Evolution & Natural selection 4. Cell theory 5. Genetic theory of inheritance 6. Atomic theory 7. Newton's Laws of motion 8.

As magma cools and crystallizes minerals form is predictable patterns in a process known as

Which of the following atoms will not react with water? A. K B. Li C. Pb D. Na

Which of the following is not a component of plasma? A. Carbon monoxide B. Blood C. Water D. Oxygen

The atomic radius of an element _ when you move from the top to the bottom of a family. O decreases O increases

Lowest density of all elements

A chemical engineer for a fertilizer company is determining the most efficient way to produce ammonia. the engineer carries out the haber reaction under four different conditions.