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3 years ago

Science, compare and contrast Quantitative and Qualitative observations

1 answer:

6 0

Quantitative observation have accuracy over qualitative observation as in Quantitative observation data is recorded in terms of number .

Explanation:
Qualitative observations are descriptive observations that don't involve numbers. " The freezing point of water is colder than the boiling point " is an example. Quantitative observations are numerical measurements. "The freezing point of watrr is 0 c and boiling point is 100 c" is a quantitative observation.

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When chemists work with solid materials, we simply weigh out amounts of solid reagents and calculate mole amounts when thinking

IgorC [24]

Answer:

0.187 mol

Explanation:

A solution is created by dissolving 10.0 grams of ammonium chloride in enough water to make 315 mL of solution.

The formula of ammonium chloride is NH₄Cl and its molar mass is 53.49 g/mol. We can use this information to calculate the moles of ammonium chloride associated with 10.0 grams.

10.0 g × (1 mol/53.49 g) = 0.187 mol

8 0

3 years ago

Read 2 more answers

A 13.5g sample of gold is heated, then placed in a calorimeter containing 60g of water. The temperature of water increases from

sweet-ann [11.9K]

Answer:

$T_i~=163.1$ ºC

Explanation:

We have to start with the variables of the problem:

Mass of water = 60 g

Mass of gold = 13.5 g

Initial temperature of water= 19 ºC

Final temperature of water= 20 ºC

Initial temperature of gold= Unknow

Final temperature of gold= 20 ºC

Specific heat of gold = 0.13J/gºC

Specific heat of water = 4.186 J/g°C

Now if we remember the heat equation:

$Q_H_2_O=m_H_2_O*Cp_H_2_O*deltaT$

$Q_A_u=m_A_u*Cp_A_u*deltaT$

We can relate these equations if we take into account that all heat of gold is transfer to the water, so:

$m_H_2_O*Cp_H_2_O*deltaT=~-~m_A_u*Cp_A_u*deltaT$

Now we can put the values into the equation:

$60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C=-(13.5~g*0.13~J/g{\circ}C*(20-T_i)~{\circ}C)$

Now we can solve for the initial temperature of gold, so:

$T_i~=(\frac{60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C}{13.5~g*0.13~J/g{\circ}C})+20$

$T_i~=163.1$ ºC

I hope it helps!

5 0

3 years ago

Given the balanced equation 4al s 3o2 g which type of chemical reaction is shown

Archy [21]

This is a synthesis reaction. Synthesis reactions are when two elements or simple compounds combine to make a single compound. Here Al and O2 are both elements, so they must perform synthesis.

6 0

3 years ago

Nguyên tố A có cấu hình electron phân lớp cuối cùng là 4p3. A phải

Studentka2010 [4]

Answer: ?

Explanation: I translated this and It makes no sense.

Tôi đã dịch điều này và nó không có ý nghĩa.

4 0

3 years ago

Which of the following manifests the harmonious bringing forth of technology?

irinina [24]

Answer:

iPhones

Explanation:

Hope this helps:)

3 0

3 years ago