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BigorU [14]
3 years ago
7

hEEEYYYY peeps! this is the same related question about another scientist with the cells, so yeaaaaaah...btw meh teacher also ma

de dis as well:>

Chemistry
1 answer:
ki77a [65]3 years ago
4 0

Answer:

im pretty sure it is D

Explanation:

this is an old term for a microscopic organisms that included bacteria, protozoans, and very small animals

You might be interested in
What are some downsides to fossil fuels? (Select all that apply.)​
Tamiku [17]

Answer:

you did not show me the options so i'm just going to say a few.

Explanation:

global warming

releases carbon dioxide into the air

other harmful chemicals

takes up a lot of space and time

5 0
3 years ago
Read 2 more answers
1.<br> How<br> many atoms of Li are there in 7.5 moles of Li?
ZanzabumX [31]

Answer: 4.52x10²⁴ atoms Li

Explanation: For 1 mole of Li it is equal to the Avogadro's Number.

Solution:

7.5 moles Li x 6.022x10²³ atoms Li/ 1 mole Li

= 4.52x10²⁴ atoms Li

6 0
3 years ago
Need help ASAP!!!! what is the value (angle) for the C=C=O bond in Ketene i.e. CH2=C=O
stepan [7]

Answer:

180^\circ by the VSEPR theory.

Explanation:

This question is asking for the bond angle of the \rm C=C=O bond in \rm H_2C=C=O. The VSEPR (valence shell electron pair repulsion) theory could help. Start by considering: how many electron domains are there on the carbon atom between these two bond?

Note that "electron domains" refer to covalent bonds and lone pairs collectively.

  • Each nonbonding pair (lone pair) of valence electrons counts as one electron domain.
  • Each covalent bond (single bond, double bond, or triple bond) counts as exactly one electron domain.

For example, in \rm H_2C=C=O, the carbon atom at the center of that \rm C=C=O bond has two electron domains:

  • This carbon atom has two double bonds: one \rm C=C bond and one \rm C=O bond. Even though these are both double bonds, in VSEPR theory, each of them count only as one electron domain.
  • Keep in mind that there are only four valence electrons in each carbon atom. It can be shown that all four valence electrons of this carbon atom are involved in bonding (two in each of the two double bonds.) Hence, there would be no nonbonding pair around this atom.

In VSEPR theory, electron domains around an atom repel each other. As a result, they would spread out (in three dimensions) as far away from each other as possible. When there are only two electron domains around an atom, the two electron domains would form a straight line- with one domain on each side of the central atom. (To visualize, consider the three atoms in this \rm C=C=O bond as three spheres on a stick. The central \rm C atom would be between the other \rm C atom and the \rm O atom.)

This linear geometry corresponds to a bond angle of 180^\circ.

3 0
3 years ago
How do I convert 50 years into seconds. Express your answer in scientific notation?
ludmilkaskok [199]

Answer: 15768 seconds

Explanation:            (50 years) x (365 da/yr) x (86,400 sec/da)

        =      (50 x 365 x 86,400)  seconds

        =        1.5768 x 10⁹ seconds

8 0
3 years ago
Calculate Δ H o for the reaction. CH3OH + HCl → CH3Cl + H2O answer is in kJ/mol .
Nimfa-mama [501]

Answer:

\Delta H=-28.08 \frac{kJ}{mol}

Explanation:

Hello,

This types of reactions are likely to be carried out in gaseous phase as it is easier to induce reactions, therefore, for us to compute the change in the enthalpy of this reaction we should write the formation enthalpy of gaseous methanol, hydrogen chloride, methyl chloride and water as -205.1, -92.3, -83.68 and -241.8 kJ/mol respectively. Then, the reaction enthalpy for this reaction is:

\Delta H=\Delta _fH_{CH_3Cl}+\Delta _fH_{H_2O}-\Delta _fH_{CH_3OH}-\Delta _fH_{HCl}\\\\\Delta H=-83.68\frac{kJ}{mol}-241.8\frac{kJ}{mol}-(-205.1\frac{kJ}{mol})-(-92.3\frac{kJ}{mol} )\\\\\Delta H=-28.08 \frac{kJ}{mol}

Which accounts for an exothermic chemical reaction.

Regards.

7 0
4 years ago
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