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3 years ago

I need help with that

Chemistry

1 answer:

Juliette [100K]3 years ago

5 0

Answer:

For (a) the independent variable is what stays constant throughout the whole experiment and the dependent variable is changes in the experiment.

Explanation:

I'm not sure about the other parts, but I hope my explanation for a can get you started :)

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Physics have been taking the Hippocratic Oath for more than 2,000 years. Among other things, to Serie doctors who take the oath

Sauron [17]

Answer:

Physicians and it is ethical because they promise to help

Explanation:

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3 years ago

Which mineral(s) might you be examining if you place some hydrochloric (hcl) acid on a sample and it fizzes?

makvit [3.9K]

The minerals that one might be examining if you place some hydrochloric acid on a sample and it fizzes are Calcite and Dolomite.
Calcite and dolomite are very similar minerals. Both have the same hardness, the same rhombohedral cleavage, and are found in identical geologic settings. The best way to tell one from the other is the acid test; A drop of 1 M HCl on calcite produces an instant , obvious Fizz; a drop on dolomite produces slow or no obvious bubbling.

4 0

3 years ago

Two solutions, initially at 24.69°C, are mixed in a coffee cup calorimeter (Ccal = 105.5 J/°C). When a 200.0 mL volume of 0.100

Lana71 [14]

Answer:The correct answer is option c.

Explanation:

$AgNO_3+NaCl\rightarrow AgCl+NaNO_3$

Specific heat of water = 4.18 J/g°C

Density of water = 1 g/ml

Mass of $AgNO_3$ solution ,m'= $1 g/ml\times 200 ml= 200 g$

Mass of $NaCl$ solution ,m''= $1 g/ml\times 100 ml= 100 g$

Since NaCl solution is present in lessor mass so, it will act limiting reagent.

Heat absorbed by the solution

$Q=mc\Delta T=(m'+m'')c\Delta T=300 g\times 4.18 J/g^oC\times (0.47^oC)=589.38 J$

Heat absorbed by the calorimeter , $Q'=mc'\Delta T=c'\Delta T=105.5J/^oC\times (0.47^oC)=49.585 J$

Heat released during reaction, $\Delta H_{rxn}$ =49.585 J+589.38 J=638.965 J

As we know that NaCl is present as limiting reagent, the product will form according to the availability of NaCl.

Moles of NaCl in 100.0 ml of 0.100 solution = 0.01 moles

1 mol of NaCl gives 1 mol of AgCl, then 0.01 mol of NaCl will give 0.01 mol of AgCl

Heat of the reaction per 1 mol of AgCl = $\frac{638.965 J}{0.01 mol}=6 63896.5 J/mol= 63.896 kJ/mol\approx 64 kJ/mol$

The heat released during the reaction that exothermic reaction's $\Delta H_{rxn}$ is negative.

Hence the correct answer is option c.

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3 years ago

Please help! I have no idea what a galactic symbol is. It says it on one of my science assignments and I'm confused. All I know

Ilya [14]

Hey, its alright bro! I gotchu.

Im pretty sure the galactic symbol is the same reference to the symbol of the element on the periodic table.
For an example (Hydrogen) is H
So if im correct im pretty sure its referring to the symbols for each element

Hopefully this helps

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3 years ago

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What is the smallest substance? <br> 1 .mixture<br> 2 .compound<br> 3 .element

Andrew [12]

Number 3 it’s element

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3 years ago

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