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ahrayia [7]
3 years ago
8

mass number is the number of protons and neutrons in the nucleus of an isotope . how many electrons in an oxygen-18 atom ?

Chemistry
1 answer:
xenn [34]3 years ago
3 0

Answer:

In neutral oxygen atom 8 electrons are present

Explanation:

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Sadie knows that the school record for the 100-meter dash is 18 seconds. During last weekend's race, the track coach time
Tju [1.3M]

Answer: Keith and Aaron only

Explanation:

Since the school record for the 100-meter dash is 18 seconds, while

Juan did 19 seconds;

Hans did 16 seconds;

Keith did 17 seconds; and

Aaron did ILELE (unknown value)

Based on this illustration, only Keith and Aaron finished the 100-meter race at a lesser time than the school record.

Thus, Keith and Aaron only are the students that have broken the school record.

3 0
3 years ago
Read 2 more answers
When a scientific theory has been tested and proved by the scientific community, it becomes a law. True or False
LekaFEV [45]

Answer:

False

Explanation:

Because laws and theories are developed for different purposes, laws never become theories, and theories do not become laws.  

7 0
3 years ago
what is the new pressure acting on a 2.5 l balloon if its original volume was 5.8 l at 3.7 ATM of pressure
Ivan

Answer : The new pressure acting on a 2.5 L balloon is, 8.6 atm.

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

P\propto \frac{1}{V}

or,

P_1V_1=P_2V_2

where,

P_1 = initial pressure = 3.7 atm

P_2 = final pressure = ?

V_1 = initial volume = 5.8 L

V_2 = final volume = 2.5 L

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

3.7atm\times 5.8L=P_2\times 2.5L

P_2=8.6atm

Thus, the new pressure acting on a 2.5 L balloon is, 8.6 atm.

8 0
3 years ago
What is the chemical name of the compound Cu(NO3)2? Use the list of polyatomic ions and the periodic table to help you answer.
vlabodo [156]

Answer:

C. Copper (II) nitrate

Explanation:

It's an inorganic compound that forms a blue crystalline solid

8 0
2 years ago
Energy that is stored due to an object's height above the ground is __
mixas84 [53]

Answer:

Gravitational potential energy

Explanation:

it is

4 0
2 years ago
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