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qwelly [4]
3 years ago
12

Describe several main ideas in chemistry

Chemistry
1 answer:
12345 [234]3 years ago
7 0
Matter.

A force of attraction that holds atom together 
<span>When atoms react they form a chemical bond which is defined as a force of attraction that holds atom together. A force of attraction is defined as a kind of force that draws two or more objects together regardless of distance. There are two major categories of forces of attraction, one is intramolecular and intermolecular. Intramolecular forces is the presence of forces in atoms internally. While intermolecular is the force by which the force that is existent in two or more elements. </span>
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Identify the hybridization of the c atom in ch2br2.
Oliga [24]
Hello!

The hybridization of the C atom in CH₂Br₂ is sp3

When bonding, the orbitals "s" and "p" from C atoms interact to form hybridized orbitals. If the C atom has 4 sigma bonds, as is the case in CH₂Br₂, there are 4 hybridized orbitals required, so 1 "s" orbital and 3 "p" orbitals hybridize to form an sp3 hybrid orbital. This orbital has tetrahedral geometry and the bond angle is 109,5 °.

Have a nice day!
7 0
3 years ago
Read 2 more answers
A gold coin contains 3.47*10^23 gold atoms. what is the mass of the coin in grams
Veseljchak [2.6K]
113.5 g Au I think....
4 0
3 years ago
(40 points)
Genrish500 [490]

Answer:

The sample will dissolve in more than 1 minute.

Explanation:

In order to answer this question, we have to consider several significant aspects:

  • temperature is directly proportional to kinetic energy, that is, the greater the temperature, the greater the kinetic energy. Since kinetic energy measures velocity of the particles, this means that the greater the temperature, the greater the velocity of the individual ions of potassium phosphate;
  • we may conclude from the first fact that the number of collisions in a given amount of time will then increase due to an increase in velocity;
  • it also follows that the greater the temperature, the faster our salt dissolves due to an increase in the number of successful collisions.

This means that at a lower temperature, the sample will dissolve in a longer period of time.

6 0
3 years ago
Read 2 more answers
An 18.0 g piece of an unidentified metal was heated from 21.5 °C to 89.0 °C. If 789.75 J of heat energy was absorbed by the meta
nydimaria [60]

Answer: The metal is Calcium.

Explanation:

To calculate the specific heat of substance during the reaction.

q=m\times c\times \Delta T

where,

q = heat absorbed = 789.75 J

c = specific heat of metal = ?

m = mass of substance = 18.0 g

\Delta T_f = final temperature  - initial temperature  = (89.0-21.5)^0C=67.5^0C

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

789.75J=18.0g\times c\times 67.5^0C

c=0.65J/g^0C

As specific heat is characteristic of each metal and thus the metal is calcium which has  specific heat of 0.65J/g^0C

5 0
2 years ago
To three significant figures, the measurement 1246 g should be reported as [number] g.
katrin2010 [14]

Answer:

  • <u>1250 g</u>

Explanation:

The measurement <em>1246g</em> shows four figures. To show this measurement to <em>three signficant figures</em> you must change the last digit to 0 and round properly.

To report the measurement 1246g to three significant figures you must replace the last digit (the 6) with 0 and round the previous one (the 4) to the closest integer: 1250 is closest to 1246 than 1240, so the correct rounding is 1250.

In an integer number, the zeros after the last none zero digit are not sginificant figures; that is why the zero in 1250 g is not significant and this number has just three significant figures.

4 0
3 years ago
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