Phase change occur in substances when the they change from one state of matter to another due to the addition or removal of heat.
<h3>What are phase changes?</h3>
Phase changes refers to the changes that occur in substances in which they change from one state of matter to another due to the addition or removal of heat.
The phase changes that occur in substances are as follows:
- change from solid to liquid known as melting
- change from liquid to gas known as vaporization
- change from solid to gas known as sublimation
- change from gas to solid known as deposition
- change from gas to liquid known as condensation
- change from liquid to solid known as freezing
Therefore, phase change occur in substances when the they change from one state of matter to another due to the addition or removal of heat.
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The answer is d: Combustion, because it is the so-called combustion of methan. (Check your lesson)
<u>Answer:</u> The empirical formula for the given compound is 
<u>Explanation:</u>
We are given:
Mass of copper chloride in 1 L or 1000 mL of solution = 42.62 grams
<u>Taking Trial A:</u>
Volume of solution = 49.6 mL
Applying unitary method:
In 1000 mL of solution, the mass of copper chloride present is 42.62 grams
So, in 49.6 mL of solution, the mass of copper chloride will be = 
We are given:
Mass of filter paper = 0.908 g
Mass of filter paper + copper = 1.694 g
Mass of copper = [1.694 - 0.908] g = 0.786 g
Mass of chlorine in the sample = [2.114 - 0.786]g = 1.328 g
To formulate the empirical formula, we need to follow some steps:
- <u>Step 1:</u> Converting the given masses into moles.
Moles of Copper =
Moles of Chlorine = 
- <u>Step 2:</u> Calculating the mole ratio of the given elements.
For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0124 moles.
For Copper = 
For Chlorine = 
- <u>Step 3:</u> Taking the mole ratio as their subscripts.
The ratio of Cu : Cl = 1 : 3
Hence, the empirical formula for the given compound is
Answer:
Human activity is by far the biggest cause of habitat loss.
Humans are now responsible for causing changes in the environment that hurt animals and plant species. We take up more space on Earth for our homes and cities. We pollute habitats. ... Human activity often changes or destroys the habitats that plants and animals need to survive.
Explanation:
Human activities are the various actions for recreation, living, or necessity done by people. For instance it includes leisure, entertainment, industry, recreation, war, and exercise.
Over time, destruction of such habitats leads to reduced biodiversity, weakening the Earth's ecosystems, and ultimately posing a major threat to human life. While, significant tracts of habitat have been lost, and along with them many species of plant and animal, steps can be taken to slow and even reverse the process.
One of the most significant ways in which humans have impacted on the lives of other species is by causing climate change. Many animals, including birds and frogs, now breed much earlier in spring in Britain than they did 20 years ago. Whether or not this is having a harmful effect on them has yet to be determined.
