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IrinaK [193]
3 years ago
7

What is the correct order of the scientific method?

Chemistry
1 answer:
Alex787 [66]3 years ago
5 0

Answer:

  1. make an observation
  2. ask questions
  3. form a hypothesis
  4. predict your hypothesis
  5. test your hypothesis prediction
  6. make new modifications to your hypothesis (repeat the steps)

Explanation:

I hope this helps! :)))

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Determine the Ka for CH3NH3+ at 25*C. The Kb for CH3NH2 is 4.4 x 10-4.
vfiekz [6]

Answer:

Ka= 2.3 x 10^-11

Explanation:

so Ka x Kb = Kw where Kw=10^-14 at 25 degrees Celsius

plugging in Kb and Kw, we have

Ka x 4.4 x 10^-4 = 10^-14

solving for Ka,

Ka= (10^-14)/(4.4 x 10^-4)

Ka= 2.3 x 10^-11

8 0
3 years ago
1. Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and 153. Europium- 151 has an abundance of 48.03
sergejj [24]
The atomic mass of Europium is 152 amu

Work:
151(0.4803) = 72.52 amu
153(0.5197) = 79.5 amu
72.5 + 79.5 = 152 amu
3 0
3 years ago
Read 2 more answers
During the cold winter months the surface Of a lake becomes hard Ice this is due to which change of state
nikitadnepr [17]

Freezing

Explanation:

This change in state when surface of a lake changes to hard ice is known as freezing.

  • When a solid is heated, it melts and changes to a liquid. On further heating, it changes to vapor and the randomness increases.
  • When a liquid is cooled below its freezing point, it changes to a solid such as ice for water.
  • The phase change is known as freezing.

Learn more:

Phase change brainly.com/question/1875234

#learnwithBrainly

8 0
3 years ago
Chemistry Lab Question: Filtration
tatyana61 [14]

For the first question, salt is soluble while sand is insoluble or not dissolvable in water. The salt should have vanished or melted, but the sand stayed noticeable or visible, making a dark brown solution probably with some sand particles caught on the walls of the container when the boiling water was put in to the mixture of salt and sand. The solubility of a chemical can be disturbed by temperature, and in the case of salt in water, the hot temperature of the boiling water enhanced the salt's capability to melt in it.

For the second question, the melted or dissolved salt should have easily made its way through the filter paper and into the second container, while the undissolved and muddy sand particles is caught on the filter paper. The size of the pores of the filter paper didn’t change. On the contrary, the size of the salt became smaller because it has been dissolved which is also the reason why it was able to go through the filter paper, while the size of the sand may have doubled or even tripled which made it harder to pass through.

6 0
4 years ago
What is the percentage of carbon in 5.00 g of sucrose
Irina-Kira [14]
The answer is rounded off to 0.0278 mol C6H12O6
3 0
3 years ago
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