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solmaris [256]
3 years ago
14

The Germans were the first to send up a satellite into space.

Chemistry
2 answers:
vladimir2022 [97]3 years ago
8 0

Answer: Thats false the Russians were the first

Explanation:

Luda [366]3 years ago
7 0

Answer:False

Explanation:Because during the cold war between the Russians and the U.S. the Russians were the first to send a satellite and the U.S. were the first to send a man

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The reaction A + BC --&gt; B+ AC is a<br> reaction.
jekas [21]

Explanation:

its answer is displacement reaction

4 0
3 years ago
N2 + 3H2 → 2NH3
lana66690 [7]

 The number of  moles  of H₂ that are needed  to react with 2.0  moles of N₂  is    6.0 moles


 <u><em>calculation</em></u>

N₂  +3H₂→   2NH₃

The moles of  H₂  is  calculated  using the mole ratio

That is from equation above  N₂:H₂  is 1 :3

therefore the moles of  H₂ = 2.0  moles  x (3/1) = 6.0 moles

4 0
3 years ago
How many atoms are there in each of the following substances?
juin [17]

To know the number of atoms, it will be necessary to use the formula of avogadro. We calculate the number of moles then we can calculate the number of avogadro.

The molar mass of:

Phosphorus = 31g / mol

Mercury = 200 g / mol

Bismuth = 209 g / mol

Strontium = 87 g / mol.

The number of avogadro (N) is 6.023 10 ^ 23

n = m (mass) / M  (molar mass)

number of atoms = n. N = m / M  . N

number of phosphorus atoms = 5.14/31 . 6.023 10^23 = 9.98 10 ^ 22 atoms

Number of atoms of mercury = 2.16/200 . 6.023 10^23 = 6.5 10 ^ 21 atoms

Number of bismuth atoms = 1.8/209 . 6.023 10^23 = 5.18 10 ^ 21 atoms

Number of strontium atoms = 8.8 x 10-2 /87 . 6.023 10^23 = 6.09 10 ^ 20 atoms

3 0
3 years ago
Which metal is the best choice for recovering copper (reacting with copper) from the solution? Fe, Ag, Zn, or Al
Gnoma [55]

Answer: The correct option is Aluminium.

Explanation: To recover copper from the solution, we require a metal which can easily displace copper from the solution.

The reactions in which metal displaces another metal in a chemical reaction are known as single displacement reactions. These reactions are studied using reactivity series.

A+BC\rightarrow AC+B

A is more reactive than B.

The metal which lie above in the reactivity series will easily displace the metal which lies below in the reactivity series.

From the given options, Aluminium is the most reactive of all the metals and hence, it is the best choice for recovering copper from its solution.

3 0
3 years ago
What is the correct wat towrite 0.0000250 m kn scientific notation?
ahrayia [7]

2.5x-10^5

hope this helped ^_^

5 0
3 years ago
Read 2 more answers
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