Pls help, science 8th grade question, #11 thx :)

Chemistry

1 answer:

Anarel [89]3 years ago

4 0

D, KOH is a concentrated Base and HCL is an acid. D is the only one that has these two.

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Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he p

Svet_ta [14]

Statement 2 is correct.
solids moving into solution is a physical change as the core structure of the molecules remain the same. evaporation of water and crystallization of salt are both physical changes as well.
The water does not change it's H2O chemical makeup because salt was dissolved into it.

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A soft drink contains 46 g of sugar(sucrose C12H22O11) how many sugar molecules are present?

professor190 [17]

8.092752363 ×10 to the power of 22

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A flask contains 6g hydrogen gas and 64 g oxygen at rtp the partial pressure of hydrogen gas in the flask of the total pressure

Alex

Answer:

B.3/5p

Explanation:

For this question, we have to remember "Dalton's Law of Partial Pressures". This law says that the pressure of the mixture would be equal to the sum of the partial pressure of each gas.

Additionally, we have a proportional relationship between moles and pressure. In other words, more moles indicate more pressure and vice-versa.

$P_i=P_t_o_t_a_l*X_i$

Where:

$P_i$ =Partial pressure

$P_t_o_t_a_l$ =Total pressure

$X_i$ =mole fraction

With this in mind, we can work with the moles of each compound if we want to analyze the pressure. With the molar mass of each compound we can calculate the moles:

moles of hydrogen gas

The molar mass of hydrogen gas ( $H_2$ ) is 2 g/mol, so: