Double-replacement and acid-base reactions are examples of redox reactions. a. true b. false

Which allotrope of carbon is considered the hardest material known?

How many neutrons are found in one atom of 16n? express your answer numerically?

The diagram represents the general equation for photosynthesis. What does the X represent? hydrogen oxygen glucose carbon dioxide

Which element is most likely to be shiny? sulfur (S) boron (B) calcium (Ca) carbon (C) ?

Write the isotope notation for the following isotope: copper-63, copper-65, magnesium-24, magnesium-25, magnesium-26, lithium-6, and lithium-7.

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

Element X has an electron configuration that ends with 5p6. Which of the following describes this atom correctly? a. unstable metal b. noble gas c. alkali metal d. unstable nonmetal

If 12.1 kilograms of al2o3 (s), 60.4 kilograms of naoh (l), and 60.4 kilograms of hf (g) react completely, how many kilograms of cryolite will be produced?

A certain ionic compound X has a solubility in water of 40.3 g/L at 20. degrees C. Calculate the mass X of required to prepare 500. mL of a saturated solution of X in water at this temperature.

IM ON A TIMER! What are the main types of star clusters? Check all that apply. binary eclipsing globular open wobbling