Marcel conducts an experiment to test which stain remover works best on mustard stains. he wants to make sure that he does not make mistakes and has correct data in his experiment.

what should marcel do to make sure that his data are correct?

conduct a similar experiment with a different washing machine
ask other students to conduct related experiments at their homes
ask his sibling to conduct the same experiment using his washing machine
repeat the experiment several times with the same variable and constants

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

the answer is c i believe

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.