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ki77a [65]
3 years ago
12

Which of the following is the best example of a hypothesis?

Chemistry
1 answer:
olga nikolaevna [1]3 years ago
7 0

Answer:

If three or more pounds of pressure is placed on glass, then it will break.

Explanation:

This is a hypothesis because it is a statement that can be tested and can be drawn a conclusion from, as you can see the others can be tested but then you have too many factors that are not taken care of, for example how big will the rock you throw to the glass be, glasses cna break because of changes in temperature, and other factors that weren´t taken into account when doing them that the only one that could work as a hypothesis would be: If three or more pounds of pressure is placed on glass, then it will break.

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Is a graph that starts at 25 and drops to 21, stays the same in temperature an endothermic reaction or an exothermic reaction?
ki77a [65]

Answer:

Explanation:

Endo and Exo thermic are defined by what changes take place in the environment of the reaction.

If the temperature goes up, the reaction is giving up heat. It is Exothermic.

If the temperature goes down, the reaction requires heat. It is Endothermic.

In this case, the temperature went down. The reaction is Endothermic.

5 0
2 years ago
How many grams of Cabr2 would be needed to create 450 mL of a 2.00 M solution?
Yanka [14]

Answer:

Mass = 179.9 g

Explanation:

Given data:

Volume of solution = 450 mL

Molarity of solution = 2.00 M

Mass in gram required = ?

Solution:

Volume of solution = 450 mL× 1 L / 1000 mL = 0.45 L

Molarity = number of moles of solute/ Volume of solution in L

2.00 M = number of moles of solute / 0.45 L

Number of moles of solute = 2.00 M × 0.45 L

M = mol/L

number of moles of solute = 0.9 mol

Mass of CaBr₂ in gram:

Mass = number of moles ×  molar  mass

Mass = 0.9 mol ×199.89 g/mol

Mass = 179.9 g

6 0
3 years ago
How to do them 11-15 most difficult ones for me
BigorU [14]
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6 0
3 years ago
✞Why is propane stored in household tanks but natural gas is not?♡♡♡​
Klio2033 [76]

Answer:

In order to keep propane a liquid at room temperature (70° F or 21° C), it has to be held in a tank at a pressure of about 850 kPa. ... Household metal tanks cannot withstand this pressure. In short, natural gas is not stored in household tanks because the symmetry of its molecule makes it hard to liquify.

4 0
3 years ago
Is H2O polar or non polar?
otez555 [7]

Answer:

Explanation:

H2O is a polar molecule

8 0
2 years ago
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