The half-life of a certain element is 100 days. How many half-lives will it be before only one-fourth of this element remains? 4

50

25

2

A calorimeter is filled with 250.0 g of water at 24.6oC. A 60.0 g sample of a metal at 100.0 oC is dropped in this calorimeter and causes the temperature to increase a total of 4.5oC.

Does technology always follow science? Explain.

Using this reversible reaction, answer the questions below: N2O4 2NO2 (colorless) (reddish-brown) - As the temperature increased, what happened to the N2O4 concentration? - Was the formation of reactants or products favored by the addition of heat?

The average adult human male has a total blood volume of 5.0 L. if the concentration of sodium ion in this average individual is 0.135 M, what is the mass of sodium ion circulating in the blood?

How is chemical and physical properties of matter like in different

Find the molar mass of potassium dichromate, K2Cr2O7

Zn (s) + cu2 + (aq) →zn2 + (aq) + cu (s). part a under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 51.0 g of copper is plated out?

13 This word describes the circulatory system that provides nutrients and oxygen to living cells of the body.

Write the outer electron configuration for the group 15 element in the fourth period.

Describe the relationship between transmittance and the absorbance?