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ololo11 [35]
3 years ago
10

Make a generalization about the importance of tools to science.

Chemistry
2 answers:
inessss [21]3 years ago
6 0
Tools are important of science, because of how and when they are used. we use them for many things especially experiments.
nasty-shy [4]3 years ago
4 0
Scientists use special tools to do their work. They gather data, or information, as they seek to learn about the world. In order to solve problems they must record data that is accurate and organized. This is an important part of the scientific method.
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1. A 99.8 mL sample of a solution that is 12.0% KI by mass (d: 1.093 g/mL) is added to 96.7 mL of another solution that is 14.0%
Tatiana [17]

Answer:

The mass of PbI2 will be 18.2 grams

Explanation:

Step 1: Data given

Volume solution = 99.8 mL = 0.0998 L

mass % KI = 12.0 %

Density = 1.093 g/mL

Volume of the other solution = 96.7 mL = 0.967 L

mass % of Pb(NO3)2 = 14.0 %

Density = 1.134 g/mL

Step 2: The balanced equation

Pb(NO3)2(aq) + 2 KI(aq) ⇆ PbI2(s) + 2 KNO3(aq)

Step 3: Calculate mass

Mass = density * volume

Mass KI solution = 1.093 g/mL * 99.8 mL

Mass KI solution = 109.08 grams

Mass KI solution = 109.08 grams *0.12 = 13.09 grams

Mass of Pb(NO3)2 solution = 1.134 g/mL * 96.7 mL

Mass of Pb(NO3)2 solution = 109.66 grams

Mass of Pb(NO3)2 solution = 109.66 grams * 0.14 = 15.35 grams

Step 4: Calculate moles

Moles = mass / molar mass

Moles KI = 13.09 grams / 166.0 g/mol

Moles KI = 0.0789 moles

Moles Pb(NO3)2 = 15.35 grams / 331.2 g/mol

Moles Pb(NO3)2 = 0.0463 moles

Step 5: Calculate the limiting reactant

For 1 mol Pb(NO3)2 we need 2 moles KI to produce 1 mol PbI2 and 2 moles KNO3

Ki is the limiting reactant. It will completely be consumed ( 0.0789 moles). Pb(NO3)2 is in excess. There will react 0.0789/2 = 0.03945 moles. There will remain 0.0463 - 0.03945 = 0.00685 moles

Step 6: Calculate moles PbI2

For 1 mol Pb(NO3)2 we need 2 moles KI to produce 1 mol PbI2 and 2 moles KNO3

For 0.0789 moles KI we'll have 0.0789/2 = 0.03945 moles PbI2

Step 7: Calculate mass of PbI2

Mass PbI2 = moles PbI2 * molar mass PbI2

Mass PbI2 = 0.03945 moles * 461.01 g/mol

Mass PbI2 = 18.2 grams

3 0
3 years ago
How was nitrogen discovered
Solnce55 [7]
In 1770 a Scottish physician and Chemist Daniel Rutherford performed a simple experiment with which he discovered nitrogen. Rutherford being with an empty bottle that he turned upside down in a pan of water so that the air was trapped. A buring candle was placed inside the bottle with the trapped air causing the water to rise a bit. The part of the air that seemed to "disappear" when the candle was bured was oxygen gas and the part of the air that did not "disappear" Ruthford discovered Nitrogen.
5 0
3 years ago
Please answer thank you so much!
soldier1979 [14.2K]
Hiii it’s mutualism hope this helped :)
3 0
3 years ago
Read 2 more answers
What are five main characteristics of a mineral
Svetradugi [14.3K]
  • Minerals are natural
  • Minerals are inorganic
  • Minerals are solids
  • Menirals have definite chemical composition
  • Minerals have  crystalline structure

<u>Explanation:</u>

  • Minerals are natural

Minerals should be found in nature. Elements made laboratories are not actual minerals like masquerading as rubies or sapphires. All naturally available crystals are not minerals like opal and amber.

  • Minerals are inorganic

Minerals are not under any class of organic compounds. Almost all known minerals come from inorganic processes. Some minerals originate from organic processes like pearls.

  • Minerals are solids

Minerals exist only as solids. Solids have a defined volume and shape, and they cannot be compressed any further. Minerals are rigid.

  • Definite chemical composition

Each mineral has a unique combination of atoms that cannot be found in other minerals. The strength of mineral can be defined by the type of bond a mineral has. Some minerals, like gold and diamond, have only one element in it.

  • Crystalline structure

Minerals form crystals that have repeated arrangements of ions. Minerals have different shapes depending on the size of the ion. Crystals usually take six types of shapes.

7 0
3 years ago
5) Determine the mass in grams of 4.82 moles of water molecules if the molar mass of
Dmitry [639]

Answer:

86.9 g

Explanation:

Use the conversion factor: 4.82 mol H2O x (18.02g H2O/1 mol H2O)

The moles cancel out so we have to multiply 4.82 x 18.02 = 86.9

The answer is 3 sig. figs.

5 0
3 years ago
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