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solong [7]
4 years ago
6

Uranus was the first planet to be discovered using a telescope. true or false

Chemistry
2 answers:
mixer [17]4 years ago
8 0

Answer:

True

Explanation:

Uranus was the first planet to be discovered by means of a telescope. This planet was viewed with a telescope in 1781 by William Herchel.

Uranus had already been visualized before its discovery as a planet, but it was not given the proper importance, because everyone who viewed it thought it was a star and not a planet. There have been records of uranus visualization since 1690, but telescope visualization was not made until 1781.

slava [35]4 years ago
7 0
Sir William Herschel announced its discovery on 13 March 1781, expanding the known boundaries of the Solar System for the first time in history and making Uranus the first planet discovered with a telescope.
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In the reaction K2CrO4 (aq) + PbCl2 (aq) 2KCl (aq) + PbCrO4(s), how many grams of PbCrO4 will precipitate out from the reaction
frozen [14]
Hope this helps, have a nice day!

4 0
4 years ago
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How many molecules are there in 2.30 grams of NH3 ?
Evgesh-ka [11]
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3 years ago
At what substrate concentration would an enzyme with a K_cat of 30.0 s⁻¹ and a Km of 0.0050 M operate at one-quarter of its maxi
Umnica [9.8K]

Answer:

The correct answer is option B.

Explanation:

Michaelis–Menten 's equation:

v=V_{max}\times \frac{[S]}{(K_m+[S])}=k_{cat}[E_o]\times \frac{[S]}{(K_m+[S])}

V_{max}=k_{cat}[E_o]

v = rate of formation of products

[S] = Concatenation of substrate = ?

[K_m] = Michaelis constant

V_{max}= Maximum rate achieved

k_{cat} = Catalytic rate of the system

E_o = initial concentration of enzyme

We have :

v=\frac{V_{max}}{4}

[S] =?

K_m=0.0050 M

v=V_{max}\times \frac{[S]}{(K_m+[S])}

\frac{V_{max}}{4}=V_{max}\times \frac{[S]}{(0.0050 M+[S])}

[S]=\frac{0.005 M}{3}=1.7\times 10^{-3} M

So, the correct answer is option B.

8 0
3 years ago
7 points
Free_Kalibri [48]

Answer: 12 ( answer not among the option)

Explanation:

From the equation of reaction; P4O10+ H2O     ----->    H3PO4, it is unbalanced.

One can only get the exact number of ''Hydrogen atom'' if it is well balanced.

Adding '4' to H3PO4 on the RHS and '6' to H2O on LHS of the equation would give a balanced equation such as;

P4O10 + 6H2O     ----->   4 H3PO4

Therefore the number of hydrogen atoms found on the reactant is 12.

6 0
3 years ago
What is the chemical formula for acetic acid?<br> O CHO<br> O C₂H4O2<br> O C₂OH<br> O C₂0₂H
Pavlova-9 [17]

Answer:

The answer is C2H4O2

3 0
2 years ago
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