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Dvinal [7]
3 years ago
7

Which of the following metals will react with water to produce a metal hydroxide and hydrogen gas? (2 points) Mg Li Al Pb

Chemistry
1 answer:
WITCHER [35]3 years ago
7 0
Technically, with the right conditions and catalyst(s), all of the metals will react with water to form a metal hydroxide and hydrogen gas. However, at room temperature and atmospheric pressure, lithium is the only metal that will undergo the reaction to a significant extent.
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Explain why 0.76 * 103 would not be considered a correct answer for a scientific notation problem? What should be done to fix th
Valentin [98]
The decimal should be after the 7 and before the 6.
7 0
2 years ago
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As part of your job you are asked to make 1 liter of a 0.5 molar sucrose solution. how much sucrose (c12h22o11) do you need? use
kakasveta [241]

Answer:-  171 g

Solution:- It asks to calculate the grams of sucrose required to make 1 L of 0.5 Molar solution of it.

We know that molarity is moles of solute per liter of solution.

If molarity and volume is given then, moles of solute is molarity times volume in liters.

moles of solute = molarity* liters of solution

moles of solute = 0.5*1 = 0.5 moles

To convert the moles to grams we multiply the moles by molar mass.

Molar mass of sucrose = 12(12) + 22(1) + 11(16)  

= 144 + 22 + 176

= 342 grams per mol

grams of sucrose required = moles * molar mass

grams of sucrose required = 0.5*342  = 171 g

So, 171 g of sucrose are required to make 1 L of 0.5 molar solution.




6 0
3 years ago
What is different about atoms after a redox reaction has happened?
klasskru [66]
The difference is the amount of oxygen in the compound
3 0
3 years ago
The scientific name for water is H2O because it contains:_________
andrey2020 [161]

Answer:

a

Explanation:

Each oxygen molecule has 2 hydrogen molecules

6 0
3 years ago
How to do q solution, qrxn, moles of Mg , and delta Hrxn?
Helga [31]

Answer:

<em> 14, 508J/K</em>

ΔHrxn =q/n

where q = heat absorbed and n = moles

Explanation:

<em>m = mass of substance (g) = 0.1184g</em>

1 mole of Mg - 24g

<em>n</em> moles - 0.1184g

<em>n = 0.0049 moles.</em>

Also, q = m × c × ΔT

<em> Heat Capacity, C of MgCl2 = 71.09 J/(mol K)</em>

<em>∴ specific heat c of MgCL2 = 71.09/0.0049 (from the formula c = C/n)</em>

<em>= 14, 508 J/K/kg</em>

ΔT=  (final - initial) temp = 38.3 - 27.2

= 11.1 °C.

mass of MgCl2 = 95.211 × 0.1184 = 11.27

⇒ q = 11.27g × 11.1 °C × <em>14, 508 j/K/kg </em>

<em>= 1,7117.7472 J °C-1 g-1</em>

<em />

<em>∴ ΔHrxn = q/n</em>

<em>=1,7117.7472  ÷ 0.1184 </em>

<em>= 14, 508J/K</em>

6 0
3 years ago
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