1) In the picture , which of the following is the best evidence that a chemical reaction has occurred? The mass is 2402.0 g

The phenol red is a yellow color

Bubbles are formed in the inverted tube

There is no evidence of a reaction

2) The reaction depicted in question 1 is: 2 H2O2(aq) → 2 H2O(l) + 1 O2(g)

A) Give the formula of a product.

B) What is the phase of matter for O2?

C) If the reaction were performed in a closed container and the mass was measured to be 2402.0 g, what would you expect the mass to be after the reaction is complete? Why?

3. It is possible to use dimensional analysis to calculate the number of molecules in 3.2 moles of carbon dioxide if we use the fact that 1 mole = 6.02 x 10^23 molecules. Which of the following equations is the correct way to set up this calculation?
(see attachment 2)

4) Write 602000000000 in scientific notation.

5) Balance and name the type of reaction (synthesis, decomposition, single displacement, double displacement or combustion) for each of the following:

A) ___ I2 + ___ F2 → ___ IF7

Type of rxn:

B) ___ Sn + ___ Cr2O3 → ___ Cr + ___ SnO2

Type of rxn:

C) ___ C9H20 + ___ O2 → ___ CO2 + ___ H2O

Type of rxn:

6) Determine the molar mass for each of the following

A) Cr2O3 B) IF7

7) Determine the mass of 0.804 moles Cr2O3.

8) Calculate the number of moles in 76.5 grams of IF7.

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

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.

The polymer used for the nonstick surface of cooking utensils is 24.0%c and 76%f by mass. what is the empirical formula of this polymer?