An isotope of xenon has an atomic number of 54 and contains 77 neutrons. What is the xenon isotope's mass number? 23 54 77 131

The so-called Livestock Evolution involves increased consumption of animal products in developing countries. True or false?

Consider the nuclear equation below. 222/66Rn-->218/? Po+4/2He Which is the missing value that will balance the equation? 84 86 88 90

Suppose that for the same 10.0 ml sample described in q3, the mass of the crucible with precipitate was 17.550 g, and the mass of the empty crucible (tare weight) was 17.410 g. calculate the concentration of the ba (oh) 2 solution from these data.

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 Kelvin and 1.21 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) yields 2LiOH (aq) + H2 (g)

A student needs to dilute a 0.46 M Pb (NO3) 2 solution to make 55.0 mL of 0.14 M Pb (NO 3) 2. Set up the calculation by placing the values with the correct units into the equation. Then, calculate the volume, in milliliters, of the 0.

When you kick a soccer ball across a field it will eventually come to a stop. Does this prove or disprove Newton's first law of motion? It disproves Newton's first law of motion because gravity is stronger than friction.

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

If a new substance is formed in a chemical reaction, what atoms do they consist of?

What is a scientific explanation for a range of hypotheses and observations supported by testing

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.