1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fittoniya [83]
3 years ago
6

Why is it important to make observations about the reactants? ​

Chemistry
1 answer:
Free_Kalibri [48]3 years ago
7 0

Answer:

Reason Down below

Explanation:

It is important because when you make observation you get a clue sometimes and it  reactants i feel like it also takes places with observation. :)

You might be interested in
What affects the nervous system? and how does it affect the nervous system?
vazorg [7]
When you get injured or hurt it affects the nervous system and let’s it react by the severity.
6 0
3 years ago
Read 2 more answers
When 21.45 g of KNO3 was dissolved in water in a calorimeter, the temperature fell from 25.00°C to 14.14 °C. If the heat capacit
pashok25 [27]

25.9 kJ/mol. (3 sig. fig. as in the heat capacity.)

<h3>Explanation</h3>

The process:

\text{KNO}_3\;(s) \to \text{KNO}_3\;(aq).

How many moles of this process?

Relative atomic mass from a modern periodic table:

  • K: 39.098;
  • N: 14.007;
  • O: 15.999.

Molar mass of \text{KNO}_3:

M(\text{KNO}_3) = 39.098 + 14.007 + 3\times 15.999 = 101.102\;\text{g}\cdot\text{mol}^{-1}.

Number of moles of the process = Number of moles of \text{KNO}_3 dissolved:

\displaystyle n = \frac{m}{M} = \frac{21.45}{101.102} = 0.212162\;\text{mol}.

What's the enthalpy change of this process?

Q = C\cdot \Delta T = 0.505 \times (25.00 - 14.14) = 5.4843\;\text{kJ} for 0.212162\;\text{mol}. By convention, the enthalpy change \Delta H measures the energy change for each mole of a process.

\displaystyle \Delta H = \frac{Q}{n} = \frac{5.4843\text{kJ}}{0.212162\;\text{mol}} = 25.8\;\text{kJ}\cdot\text{mol}^{-1}.

The heat capacity is the least accurate number in these calculation. It comes with three significant figures. As a result, round the final result to three significant figures. However, make sure you keep at least one additional figure to minimize the risk of rounding errors during the calculation.

4 0
3 years ago
The electron configuration of an element is 1s2 2s2 2p1. How many valance electrons does the element have. 1,2,3 or 4
kotykmax [81]

Answer:

3

Explanation:

5 0
3 years ago
Read 2 more answers
What is evaporation? Describe what happens at the molecular level during evaporation.
jasenka [17]
 Evaporation happens<span> when atoms or </span>molecules<span> escape from the liquid and turn into a vapor. Not all of the </span>molecules in a liquid have the same energy. <span>Sometimes a </span>liquid<span> can be sitting in one place (maybe a puddle) and its molecules will become a </span>gas<span>. That's the process called </span>evaporation<span>. It can happen when liquids are cold or when they are warm. It happens more often with warmer liquids. You probably remember that when matter has a higher temperature, the molecules have a higher </span>energy<span>. When the energy in specific molecules reaches a certain level, they can have a </span>phase change<span>. Evaporation is all about the energy in individual molecules, not about the average energy of a system. The average energy can be low and the evaporation still continues. </span>
6 0
3 years ago
If Jonathan went skateboarding from 4:00 PM to 4:30 PM and traveled 450 meters, what was his average speed?
mrs_skeptik [129]
20 m Increase by five
8 0
2 years ago
Other questions:
  • Classify each of the following as an exothermic or an endothermic reaction:
    14·2 answers
  • What is the density of 35 ml of a liquid that has a mass of 28.7 g?
    12·2 answers
  • The element copper exists in nature as two isotopes: has a mass of 62.9296 u and has a mass of 64.9278 u.The average atomic mass
    11·1 answer
  • When the partition is removed, the gas expands and fills both compartments. How many moles n of gas were initially contained in
    6·1 answer
  • An ideal gas cannot exist outside of ideal gas conditions<br><br> true or false ?
    7·1 answer
  • How much water should be added to 70ml of 60 percent acid solution to dilute it to a 50 percent acid solution?
    6·1 answer
  • How many ozone molecules can each chlorine atom in the stratosphere destroy
    12·1 answer
  • A(n)
    14·1 answer
  • Solution: Will give brainliest
    8·1 answer
  • What happens to the kinetic energy of the particles in a sample of gas as
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!