Answer:
69.036 g of Compound is required to obtain 48.45 g of Oxygen.
Explanation:
Let us assume that the total mass of the compound is 100 g. So it means that this compound weighing 100 is composed 70.18 % of Oxygen or among 100 g of this compound 70.18 g is constituted by oxygen only. Hence, we can make a relation as that,
70.18 g O is present in = 100 g of a Compound
So,
48.45 g of O will be present in = X g of a Compound
Solving for X,
X = 100 g × 48.45 g ÷ 70.18 g
X = 69.036 g of Compound
Calcium and Nitrogen
hydrogen, phosphorus, oxygen, calcium, nitrogen, sulfur
carbon, hydrogen, phosphorus, oxygen, nitrogen, sulfur
hydrogen, oxygen, potassium, calcium, nitrogen, sodium
Answer:
The correct option is C
Oxygen
Carbon
Hydrogen
Nitrogen
Sulfur
Phosphorus
Explanation:
Oxygen is considered to be the most abundant element to be found in the living cells. Usually, a living cell is made up of 65% oxygen.
Carbon is the element which forms the basis for life for all organisms which can be seen on the planet Earth.
Hydrogen combines with oxygen to form water which makes up 65 percent of the human body.
Nitrogen is an active constituent of molecules such as proteins which are of utter importance to an organism.
Phosphorus is present in the form of phospholipid layer which is an active constituent of the cell membranes.
Answer:
The correct option is C
Explanation:
In the given question, melting cheese is a type of physical change.
A physical change is defined as a change in the physical properties of a substance, such as its shape, size, or state, without changing its chemical composition.
When cheese is melted, it changes from a solid to a liquid state, but its chemical composition remains the same. The molecules in the cheese are simply rearranged as it is heated, causing it to melt.
Therefore, melting cheese is a physical change. This is because the cheese changes from a solid to a liquid state, but its chemical composition remains the same.
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Explanation:
Plasma is a state of matter which is a hot ionized gas and it contains molecules with positive ions and negative electrons.
Since there is high kinetic energy of molecules so, there is swirling gas of positive ions and negative electrons. As a result, there will be release of electrons.
For example, lightening is an example of partially ionized plasma.
When molecules gain significant kinetic energy, their collisions may cause ionization, releasing electrons and forming a plasma, the fourth state of matter. Similar processes can be observed in devices like a Van de Graaff generator or in nature, such as in the sun.
When the kinetic energy of molecules increases significantly, it can cause a phenomenon known as ionization. Energy fueling these molecules increases their pace, effectively leading to collisions among themselves and increasing their speed even more. As these collisions grow in strength, they can cause electrons to be released or ejected, thereby transforming neutral atoms into ions.
Visualize this using the concept of a Van de Graaff generator, which uses a source of positive charge and a moving belt to create a spray of positive charge that achieves high velocities. In conditions of intense kinetic energy, such as those induced by high temperature or light intensity, similar processes occur at the atomic level: atoms, ions, and molecules move and collide, breaking old bonds, forming new ones, and sometimes releasing electrons in the process.
The existence of a gas containing both positively charged ions and negatively charged electrons in this state is often referred to as a plasma. Plasmas are common in extremely hot environments and are considered the fourth state of matter alongside solid, liquid, and gas. Examples of plasmas include the sun and the colorful lights you see in neon signs.
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