Who played the lead role in developing the structure of the modern periodic table

The rate constant for this first‑order reaction is 0.900 s - 1 at 400 ∘ C. A ⟶ products How long, in seconds, would it take for the concentration of A to decrease from 0.600 M to 0.300 M?

Which of the following would cause an increase in the pressure inside a sealed container of gas? A. an increase in the size of the container / B. removal of half of the gas / C. a leak in the container / D. an increase in temperature

Which element easily loses one electron to form a positive ion? A. Magnesium (Mg) B. Lithium (Li) C. Nitrogen (N) D. Fluorine (F)

Given the number of valence electrons in neutral atoms, predict the charge of the ions each will form. one valence electron two valence electrons six valence electrons seven valence electrons eight valence electrons a. generally does not form ions b.

What is the definition of steam

A 2.0 L flexible container holds 5.0 moles of oxygen (O2) gas. An additional 15.0 moles of nitrogen gas (N2) is added to the container. What is the new volume of the container? a. 8.0 L b. 0.13 L c. 0.50 L d. 6.0L

How are complete ionic and net ionic equations written for chemical reactions in aqueous solutions

Only producers perform ... A) photosynthesis B) respiration C) both A & B D) neither A or B

A steel cylinder containing 25 kg of CCl2F2 in the form of liquid and vapor is set outdoors on a warm day 25 degrees celsius. What is the approximate pressure of the vapor in the cylinder?

Which of these observations would be classified as a physical property A:lemon juice cleans a penny B: A candle burns brightly C: baking soda in vinegar forms bubbles D: a cube of gold is hammered into a thin sheet