Two students separated a mixture of oil and water by carefully pouring the oil off the top of the mixture into another container. They used a balance to measure the mass of the mixture before it was separated and also to measure the mass of the water and the oil by themselves after they were separated. Their data is shown in the table below. Separation Data
Before Separation After Separation
Mass of Oil and Water Mass of Oil Mass of Water
16.8 grams 7.6 grams 9.2 grams

What conclusion best fits the data?
A.
The mass of a mixture is less than the sum of the masses of the parts of the mixture.
B.
The mass of a mixture is equal to the sum of the masses of the parts of the mixture.
C.
The mass of a mixture is not related to the sum of the masses of the parts of the mixture.
D.
The mass of a mixture is greater than the sum of the masses of the parts of the mixture.
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What is it called when countries build lots of weapons to store and them in case of a war?

Which of the following methods could be considered a "best practice" in terms of informing respondents how their answers to an on-line survey about personal information will be protected? respondents are informed that investigators will try to keep their participation confidential; however, confidentiality cannot be assured.respondents are informed that a research assistant will transfer all the research data to a password-protected computer that is not connected to the internet, via a usb flashdrive. the computer is located in a research team member's office.the investigator uses the informed consent process to explain her institution's method for guaranteeing absolute confidentiality of research data.the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents' ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed.the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents' ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed

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