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mariarad [96]
3 years ago
7

Name 3 ores for metals and which metal they yield?​

Chemistry
1 answer:
Sphinxa [80]3 years ago
7 0
Iron, aluminum, and silicon.
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What is the freezing point of a solution of 0.5 mol of LiBr in 500 mL of water? (Kf = 1.86°C/m) –1.86°C –7.44°C –5.58°C –3.72°C
tresset_1 [31]

Answer:

  • Last choice: <em><u>- 3.72°C</u></em>

Explanation:

The freezing point depression in a solvent is a colligative property: it depends on the number of solute particles.

The equation to predict the freezing point depression in a solvent is:

  • ΔTf = Kf × m × i

Where,

  • ΔTf is the freezing point depression of the solvent,
  • m is the molality,
  • Kf is the cryoscopic molal constant of the solvent, and i is the Van'f Hoff factor, which is the number of ions produced by each unit formula of the ionic compound.

The calcualtions are in the attached pdf file. Please, open it by clicking on the image of the file.

Download pdf
6 0
3 years ago
A gas with a volume of 500. mL at 75°C is heated to 225 °C. What is the new volume of the gas?
mihalych1998 [28]
Using v1/t1=v2/t2
v1=500
v2=?
t1=75=368k
t2=225=498
500/368=v2/498
1.4x498=v2
v2=697.2ml
6 0
3 years ago
Which element has the same number of energy levels as aluminum (Al) and the same number of valence electrons as calcium (Ca)
GREYUIT [131]

Answer:

magnesium (Mg)

Explanation:

8 0
3 years ago
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In the Bohr model of the hydrogen atom, the energy required to excite an electron from n = 2 to n = 3 is _______________ the ene
yawa3891 [41]

Answer:

greater than

Explanation:

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The faster the object is moving the more portential energy it has?
Mazyrski [523]

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sure

Explanation:

8 0
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