~40 answer quickly! ~ 1) chemical substances: 1- cuo 2- o2 3- cu2o 4- n2 5- c2h5nh2 6- li2o which substances in the list can be some of the reactants and products in the same combustion reaction? a) 1, 2, and 4 b) 2, 3, and 6 c) 2, 4, and 5 d) 1, 2, and 5 2) which of the following is a valid combustion reaction? a) c2h4 + o2 → 2c + 2h2o b) mg + h2o → mgo + h2 c) n2 + 2o2 → 2no2 d) s + o2 → s + h2o 3) when calcium metal (ca) reacts with oxygen gas (o2), it produces the ionic compound calcium oxide (cao). write the balanced equation for this reaction. then, explain if this process meets the requirements to be considered a redox reaction.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.