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Which of the following threats to internal validity arises when an event other than the treatment produces a change in participants’ behavior?

Many researchers devise “sham” treatments for their control groups to undergo, meaning that the control group interacts with researchers in some way that is not thought to impact the dependent variable, or the outcome. This is done to weaken the argument that the treatment group improvement may have occurred in part simply due to the attention this group received from the researchers. These researchers are attempting to control for which of the following?

A new medicine is marketed as being safer and more effective than existing medicines used for the same indication. Which of the following sources of evidence is the strongest?

What makes water a good solvent?

What is the difference between osmosis and dialysis?

Match the following description with its definition

Which would have the highest vapor pressure?

If you have 6M acid and you need 500ml of a 1M solution, how many ml of concentrated solution do you need to add with water to make your new solution?

When temperature increases the solubility of SOLID in liquid increases

What is the mass of silver nitrate that needs to be added to 500 grams of solution to make a 2.25% (w/w) solution.