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alexandr1967 [171]
3 years ago
8

Fill in the missing reactant and then balance each equation. k(s) + _____ → koh(aq) + h2(g) k (s) + 3h2o →2koh (aq) + 2h2 (g) bi

(no3)3(aq) + _____ → bi2s3(s) + hno3(aq) hno3(aq) + _____ → ba(no3)2(aq) + h2o(l)
Chemistry
2 answers:
monitta3 years ago
4 0
Filled   missing  reactant    and balanced    equation

2K(s)+  2H2O(l)  --->  2 KOh(aq)  +  H2 (g)

2Bi(No3)3(aq)  + 3H2S(g)---->   Bi2S3  + 6  HNO3(aq)

2HNO3(aq) +Ba(OH)2(aq)  ----> Ba(NO3)2 (aq) +  2H2O(l)

in equation  above  the  missing   reagent  in  first  equation  is  H20,  second  is   h2S  while  the  third  is  Ba(OH)2

Marta_Voda [28]3 years ago
3 0
1) 2K(s) + 2H₂O(l)→ 2KOH(aq) + H₂<span>(g)
This is a single replacement reaction where K reacts with H</span>₂O , displaces the H⁺ ion in water and combines with OH⁻ to form a base.
<span>
2) 2B</span>i(NO₃)₃(aq) + 3H₂S(g)→ Bi₂S₃(s) + 6HNO₃<span>(aq)
</span>This is a double displacement reaction where the ions are exchanged and form new compounds. Since ions are exchanged between 2 compounds its called double displacement.

3) 2HNO₃<span>(aq) + Ba(OH)</span>₂<span> → Ba(NO</span>₃<span>)</span>₂<span>(aq) + 2H</span>₂O<span>(l)
This is an acid base reaction where nitric acid and barium hydroxide react to form the respective salt and water</span>
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In the first recrystallization, after the solid has been dissolved in warm acetone, the solution is allowed to cool slowly to ro
zvonat [6]

Answer:

See explanation below.

Explanation:

In the older procedure, the solution is cooled so quickly that the recrystallization can be less effective. By allowing the solution to cool slowly, the maximum amount of crystal is formed, and also the impurities are trapped, so the process is more controlled than by the older one.

6 0
3 years ago
Do you<br> think a colony on Mars should be nearer the northern or southern<br> polar cap? Explain.
xxTIMURxx [149]

Answer:Hola TvT

Explanation:When the Martian polar caps were first viewed through telescopes, most scientists believed that they were made of water ice, like the polar caps on Earth. Like Earth, Mars has a North and South Pole. But while Earth's polar ice caps consist solely of water ice, Mars' polar caps are a combination of water ice and carbon dioxide ice. As the Martian seasons change, the carbon dioxide ice sublimates (vaporizes) in summer, revealing the surface, and freezes again in winter. As fall approaches, in each respective hemisphere, clouds begin to form over the polar region and the ice cap begins to grow. In spring, the polar caps recede...........Aside from ice, Mars' polar regions have some interesting geologic features. The north polar dune field is a vast concentration of sand dunes that stretches around the entire north polar cap. In some areas, the sand measures up to 500 km (300 miles) across. When the dunes begin to thaw in spring, dark spots form on their surfaces. The north polar dunes were first seen during the 1972 mapping of Mars by Mariner 9, and they are identical to dunes in Earth's desert regions..

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4 0
3 years ago
A gas with a volume of 15L at 640K is cooled at a constant pressure until the volume reaches 5L. What is the new temperature?
Brut [27]

Answer:

The new temperature is 213.33 K

Explanation:

Charles's law indicates that the volume of gas at constant pressure is directly proportional to its temperature. This law indicates that if the temperature increases the volume increases and if the temperature decreases the volume decreases.

So, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

\frac{V}{T}=k

When you want to study two different states, an initial and a final one of a gas, the expression can be applied:

\frac{V1}{T1} =\frac{V2}{T2}

In this case, you know:

  • V1= 15 L
  • T1= 640 K
  • V2= 5 L
  • T2=?

Replacing:

\frac{15 L}{640 K} =\frac{5 L}{T2}

Solving:

T2=\frac{5 L}{\frac{15 L}{640 K} }=\frac{5 L*640 K}{15 L}

T2= 213.33 K

<u><em>The new temperature is 213.33 K</em></u>

8 0
3 years ago
The "building blocks" of matter are
pshichka [43]
The building blocks of matter are B. Atoms and molecules.
5 0
3 years ago
What determines the chemical properties and physical properties of a mineral? the arrangement of the mineral's atoms the specifi
yKpoI14uk [10]

the arrangement of the mineral's atoms

Explanation:

The arrangement of atoms in a mineral determines both the physical and chemical property of such a substance.

  • Minerals are naturally formed inorganic chemical substances with a definite and ordered atomic arrangement. Most minerals are usually solid in nature.
  • Minerals have an ordered atomic arrangement and this dictates its properties.
  • For example, the luster minerals can be attributed to the faces of the ordered crystals that makes up the mineral.
  • Rocks breaks in certain fashion due to the nature and the ordered structure of the atoms making up their minerals.

Learn more:

rocks an aggregate of minerals brainly.com/question/6568161

#learnwithBrainly

5 0
3 years ago
Read 2 more answers
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