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malfutka [58]
3 years ago
7

I am something that is alive or was once alive.

Chemistry
2 answers:
lukranit [14]3 years ago
7 0
I think it’s biotic factors
Ierofanga [76]3 years ago
7 0

Answer:

biotic factors

Explanation:

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Describe the bonding between sodium chloride and calcium carbonate.
egoroff_w [7]

Answer:

When the transfer of electrons occurs, an electrostatic attraction between the two ions of opposite charge takes place and an ionic bond is formed. A salt such as sodium chloride (NaCl) is a good example of a molecule with ionic bonding

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During respiration, a plant uses glucose (sugar) and oxygen to give it the energy it needs to survive. During this process _____
garri49 [273]
Water and carbon dioxide . 
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3 years ago
The rate constants of some reactions double with every 10 degree rise in temperature. Assume that a reaction takes place at 271
AfilCa [17]

Answer : The activation energy for the reaction is, 119.7 J

Explanation :

According to the Arrhenius equation,

K=A\times e^{\frac{-Ea}{RT}}

or,

\log (\frac{K_2}{K_1})=\frac{Ea}{2.303\times R}[\frac{1}{T_1}-\frac{1}{T_2}]

where,

K_1 = rate constant at 271 K

K_2 = rate constant at 281 K = 2K_1

Ea = activation energy for the reaction = ?

R = gas constant = 8.314 J/mole.K

T_1 = initial temperature = 271 K

T_2 = final temperature = 281 K

Now put all the given values in this formula, we get:

\log (\frac{2K_1}{K_1})=\frac{Ea}{2.303\times 8.314J/mole.K}[\frac{1}{271K}-\frac{1}{281K}]

Ea=119.7J

Therefore, the activation energy for the reaction is, 119.7 J

3 0
4 years ago
Why is helium in group 18 on the periodic table though it only has 2 valence electrons?
damaskus [11]
<span> strictly speaking, a molecule has at least two atoms. ... Atoms with full valence electron shells are stable. Full Text[ edit ] The noble gases are a group of chemical elements that make up Group 18 on the periodic table.</span>
8 0
3 years ago
Solution A is yellow when alizarin yellow is added and blue when thymol
alexira [117]

Answer:

D. 6.3 x 10-5 mol/L NaOH

Explanation:

Alizarin yellow is an indicator that is yellow when pH < 10.1. In the same way, thymol blue is blue when pH > 9

That means the pH of the solution is between 9 - 10.1

Any acid as HCl could have a pH of these.

The solution of 3.2x10⁻⁴M NaOH has a pH of:

pOH = -log[OH-] = 3.49

pH = 14-pOH = 10.51. The pH of the solution is not 10.5

Now, the solution of 6.3x10⁻⁵M NaOH has a pH:

pOH = -log[OH-] = 4.2

pH = 14-pOH = 9.8

The pH of the solution could be 9.8. Right option is:

<h3>D. 6.3 x 10-5 mol/L NaOH</h3>
3 0
3 years ago
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