Answer:
1. Dissolving powder in milk - Chemical
- It is chemical because the milk has changed on a molecular level
2. Toasting bread - Chemical
- It is chemical because adding heat to the bread cooks it, therefore
changing it on a molecular level
3. Melting cheese - Physical
- It is physical because the physical appearance was the only change
4. Slicing apples or bannanas - Physical
- It is physical because the physical appearance was the only change
5. Frying an egg - Chemical
- It is chemical because new particles were formed
6. Milk souring - Chemical
- It is chemical because it is forming a new product (lactic acid)
Explanation:
Physical Change occurs when the particles of a substance become rearranged, but do not change into different particles.
Chemical change occurs when a new substance is formed. This process is irreversable.
Answer:
Argon has 8 valence electrons making it non reactive.
Explanation:
Reactive chemicals are store in containers filled with Argon gas because the argon gas is non reactive. This is true because the argon gas has completely filled octet structure.
This can further be explained by writing the electronic configuration of argon.
The electronic configuration of argon is given below:
Ar (18) => 1s² 2s²2p⁶ 3s²3p⁶
Valence electron => 3s²3p⁶ = 2 + 6 = 8
From the above illustration, we can see that the outermost shell (i.e 3s²3p⁶) is having 8 electrons indicating that it is completely filled as the maximum number of electrons any shell can accommodate outside the first shell is 8 electrons. Thus, argon has 8 valence electrons ( i.e electrons in the outermost shell) and hence it is non reactive as the outermost shell is completely filled.
Answer:
27.4°C
Explanation:
Using the equation:
Q = m*C*T
<em>Where Q is heat added,</em>
<em>m the mass of water</em>
<em>C specific heat of water (4.18J/g°C)</em>
<em>And T the increase in temperature</em>
We can solve for the increase in temperature and thus, the final temperature of water:
Q = 88200J; m = 6500g:
88200J = 6500g*4.18J/g°C*T
3.2°C = T = increase in temperature
Final temperature is:
24.2°C + 3.2°C =
<h3>27.4°C</h3>
Advantages<span> of </span>nuclear power- <span>The generation of electricity </span>through nuclear energy<span> reduces the amount of </span>energy generated from fossil fuels, <span>Less </span>use of fossil fuels means lowering greenhouse gas emissions. <span>Another </span>advantage<span> is the required amount of fuel: less fuel offers more </span><span>energy
Disadvantages- </span><span>Like fossil fuels, </span>nuclear<span> fuels are non-renewable </span>energy <span>resources. And if there is an accident, large amounts of radioactive material could be released into the environment. In addition, </span>nuclear<span> waste remains radioactive and is hazardous to health for thousands of years.</span>
Soil is made out of all of these things and covers almost all landmasses. Even below sand and rock there is soil.
