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Tems11 [23]
3 years ago
7

I need help with 14 and 15 please!

Chemistry
1 answer:
Dima020 [189]3 years ago
8 0
Isotopes of an element will contain the same number of protons and electrons but will differ in the number of neutrons they contain. In other words, isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons.
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If a 50 kg student is pushed in a rolling chair with a force of 20 N, what is the student’s acceleration?
Leokris [45]

Answer:

0.4m/s²

Explanation:

Given parameters:

Mass of student = 50kg

Force  = 20N

Unknown:

Acceleration = ?

Solution:

From Newton's second law of motion,

          Force  = mass x acceleration

   Acceleration  = \frac{Force }{mass}   = \frac{20}{50}    = 0.4m/s²

8 0
2 years ago
How do we turn petroleum into energy we use?
arlik [135]

You don't "turn" it into energy; petroleum HAS stored energy (chemical energy).However, you can turn it into ANOTHER TYPE OF ENERGY; usually this is done by burning the petroleum, and using it to drive machinery.

Since burning fuels is wasteful (the efficiency is limited, in theory, to the Carnot efficiency of a heat engine), other options are being explored, such as chemical reactions in a fuel cell. But such technology is not yet used on a large scale.

7 0
3 years ago
How might social interactions help lower the risk of alzhemers diseases
arlik [135]
Social interactions help lower the risk of Alzheimer diseases by stimulating the brain. Many studies show that if you use your brain more you have a lower chance of getting Alzheimer's. 
3 0
3 years ago
Read 2 more answers
During photosynthesis, the following reaction takes place: carbon dioxide + water + light energy → sugar + oxygen During cellula
Pachacha [2.7K]

Answer:

It cost Evan $17.70 to send 177 text messages. How many text messages did he send if he spent $19.10?

Explanation:

I cant do this

7 0
2 years ago
The graph shows the changes in the phase of ice when it is heated.
kow [346]

Answer:

A) 0 °C, because it is the melting point of ice.

Explanation:

  • Point B is the temperature at which the water is converted from ice (solid phase) to liquid water (liquid phase), which is the melting transition of water.

Melting point of the water is at 0.0°C.

<em>So, the right choice is: A) 0 °C, because it is the melting point of ice. </em>

<em></em>

6 0
3 years ago
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