The percentage composition of a substance is determined to analyze how much of an element is present in the substance and and why they needed.
The percentage composition of a compound or element in a mixture is the ratio of mass of the element to the total mass multiplied by 100.
here are many scenarios in daily life where calculating the percentage composition of something may be useful, such as:
Cooking and baking: When following a recipe, it may be necessary to calculate the percentage of ingredients used in a recipe to adjust the quantities.
Nutrition: When tracking your diet, you may need to calculate the percentage composition of macronutrients like protein, carbohydrates, and fat.
Finance: When creating a budget, you may need to calculate the percentage of income allocated to different expenses, such as housing, transportation, and food.
Chemistry: In chemistry, calculating the percentage composition of a compound is an essential step in determining its chemical formula and properties.
Manufacturing: In manufacturing, calculating the percentage composition of raw materials and finished products is important for quality control and cost analysis.
Medicine: In medicine, calculating the percentage of drugs in a medication is essential for prescribing the appropriate dose.
These are just a few examples, but there are many other scenarios where calculating percentage composition is useful.
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Answer:
Chemical change
Explanation:
This type of change is reversible, as the water vapor can condense back into liquid water under the right conditions.
B) look for presence or absence of wisdom teeth
C) multiply the internal distance in centimeters between the coronoid processes by the external distance in centimeters between the jaw angles(mandibular angles)
D) look for shovel shaped incisors
(It's not C)
Answer:
B) look for presence or absence of wisdom teeth
Explanation:
The only way to make a reliable guess if a victim was under 17 years old is by looking if he already had the wisdom teeth, this teeth are located in the back of the mouth, and are the third molars that humans develop after the age of 17 or 18 years on average, some could develop them after.
Answer:
MgO.
Explanation:
charges of both satisfy one another (balanced) -- producing a compound MgO.
The main cause of rising the surface temperature of the pacific ocean drought in the western united states, and flooding on the pacific coast of south america is the phenomenon called El-nino.
Surface temperatures in the equatorial Pacific rise during El Nino, while the east-west trade winds that blow close to the equator diminish. Typically, trade winds from the Americas move eastward towards Asia.
They sputter and alter course because of El Nino, becoming westerlies and carrying warm water from the western Pacific to the Americas.
Deeper seas are typically nutrient-richer, however under El Nino upwelling is limited, which reduces phytoplankton along the coast. Deeper waters typically rise to the surface.
Fish that consume phytoplankton are the first to be impacted, then organisms farther up the food chain. Additionally, tropical animals are transported by warmer water to colder regions, upsetting numerous ecosystems.
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What is the cause of rising surface temperatures of the pacific ocean, drought in the western united states, and flooding on the pacific coast of south america?
The cause of rising surface temperatures of the pacific ocean, drought in the western united states, and flooding on the pacific coast of south America is the carbon – producing companies.
a mixture of two common substances that can be separated by chemical means
a mixture of two common elements that can be separated by physical means
a pure substance that can be separated into different elements by chemical means
The second option is the answer. This is a mixture of two common substances that can be separated by chemical means.
NaCL is a compound that was formed through a chemical reaction between sodium and chlorine. In that reaction sodium which is a toxic metal combines with chlorine, a poisonous gas, to form a harmless but totally new compound NaCl or table salt.
Since the sodium ions have a positive charge and the chlorine ions have a negative charge, they are attracted to each other to form an ionic bond.
Sodium can only be separated from Chloride by chemical means e.g. electrolysis.
Answer: Option (d) is the correct answer.
Explanation:
A compound is defined as a substance which contains two different atoms that chemically combine together in a fixed ratio by mass.
A compound can be broken down into its constituent particles.
Pure substances are defined as the species which contains same type of atoms.
For example, NaCl is a pure compound and it can be separated into sodium and chlorine elements.
Thus, we can conclude that the statement a pure substance that can be separated into different elements by chemical means, best describes a compound such as sodium chloride.