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OLga [1]
3 years ago
7

9. Which of Earth’s sphere consists of all living things? A. hydrosphere B. geosphere C. biosphere

Chemistry
1 answer:
Anna007 [38]3 years ago
3 0

Answer:

i think its b

Explanation:

i took it

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This beaker contains an aqueous solution of copper II nitrate.
alexgriva [62]

Answer:

See the answer below

Explanation:

<em>Aqueous solution of copper II nitrate contains solute of copper II nitrate dissolved in water</em>. The equation for the reaction is as below:

Cu(NO_3)_2 (s) + H_2O (l) --> Cu(NO_3)_2 (aq)

Hence, the solute chemical is copper II nitrate while the solvent is water.

Chemical formula of copper II nitrate - Cu(NO_3)_2

Chemical formula of water - H_2O

8 0
3 years ago
What is the empirical formula for a molecule containing 46.8% Si and 53.2% O?
Over [174]
Assume there are 100 g of the substance.
Masses:
Si: 46.8 g
O: 53.2 g
Moles:
Si: 46.8 / 28 = 1.67
O: 53.2 / 16 = 3.32
Dividing by the smaller number:
Si: 1.6 7/ 1.67 = 1
O: 3.32 / 1.67 = 2
Thus, the formula:
SiO2
4 0
3 years ago
Order the theories from oldest to most recent.
rjkz [21]

Answer:

Explanation:

The following are the order of point from oldest to most recent

1. Atoms are tiny indivisible particles that make up all mater.

it is Postulate of Dalton's atomic theory. this theory was put forward in 1803

2.  Negatively charged electrons are embedded in a mass of positive charge.

In 1897 J.J Thomson discovered that atom consist of tiny negatively charged particles called electrons that are uniformly spread in +vely charged matrix this model called as plum pudding model.

3. Atoms consist of mostly empty space with a dense nucleus of positive charge.

While doing experiment on gold foil Rutherford presented a model in 1909 and stated that atom consist mostly empty space with dense nucleus.

4. Electrons occupy specific energy levels surrounding a positively charged nucleus.

Niels Bohr in 1913 put forward a model to explain atomic orbitals/energy level. This is a postulate of Bohr model.

5. Electrons move about a positively charged nucleus in clouds that are defined by probabilities.

In 1926 Erwin Schrödinger explain the wave function of electrons and its probability.

5 0
3 years ago
Which is most likely to provide the best data on volcanic activity over the last 2000 years?
dimaraw [331]

Answer:

By the time the Vesuvius eruption sputtered to an end the next day, Pompeii was buried under millions of tons of volcanic ash. About 2,000 Pompeiians were dead, but the eruption killed as many as 16,000 people overall. By

the time the Vesuvius eruption sputtered to an end the next day, Pompeii was buried under millions of tons of volcanic ash. About 2,000 Pompeiians were dead, but the eruption killed as many as 16,000 people overall.

Explanation:

5 0
3 years ago
How does intertia affect gymnastics
Olegator [25]
Inertia is resistance to changes in motion. Which means if you are at rest it takes an external force to get you moving. And once you are moving it takes an external force to change the direction of that motion. 

<span>For a person doing gymnastics the point that is subject to the above statement is her center of mass (roughly her belly button) . </span>

<span>So for example, once you launch into the air, gravity is the only significant force on you. It keeps you from traveling out into space by pulling you down and the trajectory of your belly button is a parabola. Now there is nothing you can do with your muscles (internal forces) to change that trajectory, even though you can do twists & turns about the center of mass. The height and range of the parabolic trajectory is determined by the angle & speed at which you initially launch yourself.
_____________________________________________________________
</span><span>inertia is one of newtons laws of motion so an object in motion tends to remain in motion until another force acts upon it that is what newton said when you are doing a back hand spring it is easier to keep going then to stop
</span><span>_____________________________________________________________

Hope this helps!!! :D 
I love gymnastics!!!!</span>
6 0
3 years ago
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