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a) as a scientist you sometimes work with radioisotopes. what are three ways you can minimize your exposure to radiation. b)why are cancer cells more sensitive to radiation than nerve cells? c)what is the purpose of placing a lead apron on a person who is receiving routine dental X-rays? d)why are the walls in a radiation lab built of thick concrete blocks?
if 5.00g helium gas is added to a 1.00-L ballon cantaining 1.00g of helium gas, what is the new volume of the ballon?
Determine the number of CH2CH2 monomeric units, n, in one molecule of polyethylene with a molar mass of 40,000 g.
A 36.4 l volume of methane gas is heated from 15 degrees C to 98 degrees C at constant pressure. what is the final volume of the gas?
If the solution has the same density and specific heat as water, what is ?H for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes.
What is the normality of a solution prepared from 10 ml 0.6 N nitric acid by diluting it to 60 ml
What is the change in the internal energy of the system as the system travels down the isotherm from state A to state C? Change in internal energy down the isotherm = 0.000
The great escape puzzle. Capture the ions and put them back into their jars. There are 8 jars. Label each jar with the formula of the compound containing the captured ions.
A large cylinder of He gas,such as that used to inflate balloons,has a volume of 25.0 L at 22 Celsius and 5.6 atm. how many moles of He are in such a cylinder ?
Hydrochloric acid (HCl) reacts with sodium carbonate (Na_2CO_3), forming sodium chloride (NaCl), water (H_2O), and carbon dioxide (CO_2). This equation is balanced as written
how many water molecules are in one cell? This can be a rough calculation, using a water density of 1g/mL and 3x10-23g as the mass of one water molecule
A transition mutation for the second codon of glu would result in a gly. Explain the consequences of this, if the glu that was mutated was in the central region of a alpha-helix
One mole of monoatomic ideal gas expands adiabatically at initial temperature T against a constant external pressure of 1 atm. from one litre to two litre.
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