A radioactive element is half disintegrated in 40 minutes. What is the time required for the decay of 75% of the element

0.25 grams of magnesium chloride are dissolved to make 50 milliliters of solution. What is the molarity of the solution?

Nuclei of u238 atoms are

What is the oxidation number of chromium in the ionic compound ammonium dichromate (nh4) 2cr2o7?

The atomic mass of an element is defined as the weighted average mass of that element's? (1) most abundant isotope (3) naturally occurring isotopes (4) radioactive isotopes

Which time is most precise? Timers at a swim meet used four different clocks to time an event

The electronegativity of germanium is 1.8; that of bromine is 2.8 on the Pauling scale. Will they form an ionic bond?

N which of the following situations would a spring scale be used? A. a study of the effect of different fertilizers on plant growth B. an investigation of the efficiency of different simple machines C.

The solubility of acetanilide in hot water (5.5 g/100 ml at 100∘C) is not very great, and its solubility in cold water (0.53 g / 100 ml at 0 ∘C) is significant. What would be the maximum theoretical percent recovery from the crystallization of 5.

How many liters of space are in 4.00x10^22 of O2 occupy at STP

Which of the following phases of matter takes the shape of its container and has definite volume? Question 1 options: plasma solid gas liquid