Chemists who analyze samples for trace metals may buy standard solutions that contain 1000.0 mg/l concentrations of the metals.
if a chemist wishes to dilute a 1.000 × 10^3 mg/l stock solution to prepare 5.000 × 10^2 ml of a working standard that has a concentration of 7.000 mg/l, what volume of the 1.000 × 10^3 mg/l standard solution is needed?

the answer is b. dilution

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl

sure im new too!

explanation: