The tendency of an element to react is closely related to the number of valence electrons in atoms of the element (answer C).
Explanation
Valence electrons are outer shell electrons of an atom.They govern the bonding behavior of an element.
when element react to form compound, valence electron are involved.
Valence electrons are involved in a reaction either by sharing among atoms or may be transferred from one atom to another.
For example in formation of NaCl bond there is transfer of valence electron between Na and Cl. Na donate 1 valence electron while Cl accept 1 electron to form NaCl
The scientists use one of their five senses to gather information, they are making an observation.
The active gathering of data from a primary source is observation. Observation of living things makes use of the senses. Using scientific tools to perceive and record data is another way that observation may be used in science.
A technique for gathering information through observation of individuals, situations, or physical qualities as they are occurring naturally.
Using one or more senses, our observational abilities provide us with knowledge about things, occasions, attitudes, and occurrences. Being able to see and learn about the outside world is crucial because it forms the basis of effective communication.
Thus, option A is correct.
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In scientific endeavors, when one of the five senses is used to gather information, it constitutes making an observation. Observations can involve both qualitative and quantitative data, and they provide evidence that scientists use to form conclusions.
When scientists use one of their five senses to gather information, they are A. making an observation. Scientists usually perform observations by using one or more of their five senses to gain an understanding of the properties or behaviors of a substance or a system. These data can be qualitative (descriptive) or quantitative (consisting of numbers). For instance, seeing a plant growing (observation) and measuring its growth over weeks (data collection). From these observations, the scientist can infer conclusions based on the evidence collected. In brain studies, the activity in the brain during specific tasks is observed, which could be the basis for conclusions about brain functionality.
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Answer: c. It decreases the phosphate ion concentration, forcing the equilibrium to the left.
Explanation:
The calcium phosphate in water is dissociated according to the following equilibrium:
Ca₃(PO₄)₂ ⇄ 3Ca²⁺ + 2PO₄³⁻
A neutralization reactionis one in which an acid reacts with a base. In the reaction a salt is formed and in most cases water is formed.
Phosphate is the complementary base of phosphoric acid, so when adding acid to the solution, we will neutralize the phosphate present according to the following reaction:
PO₄³⁻ + 3H⁺ ⇄ H₃PO₄
Therefore, when adding acid we increase the solubility of calcium phosphate since we are neutralizing the phosphate present in the salt, decreasing the concentration of phosphate, displacing the first equilibrium shown to the left and favoring the dissolution of calcium phosphate.
The addition of acid to calcium phosphate decreases the phosphate ion concentration, causing a shift in equilibrium to the right, resulting in increased solubility of calcium phosphate.
The addition of acid increases the solubility of calcium phosphate because it decreases the phosphate ion concentration. This process forces the equilibrium to shift to the right, as per Le Chatelier's principle. This principle states that when a stress (in this case, acid addition leading to decreased phosphate ion concentration) is applied to a system at equilibrium, the system responds by shifting in a direction that minimizes that stress. In this case, the equilibrium shifts to the right, resulting in the dissolution of more calcium phosphate to replace the phosphate ions that were removed due to the addition of acid.
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Answer:
Explanation:
The scale on a map represents the actual distance of any geographical or man made entity with respect to the map units. For example a scale of 1:10000 states that 1 unit of any mode of measurement on map is equal to 10,000 mode of measurement on ground. This mode of measurement could be cm, km , feet etc. Thus 1 cm of map may represent 1000 m, 10000 km , 200000 feet etc.
The scale is used to represent the relative distance in both horizontal and vertical directions.
The scale on a map provides a reference for understanding distances and spatial relationships of geographical features present in the map.
The scale on a map serves the purpose of representing the relationship between distances on the map and the corresponding distances in the real world.
It allows users to accurately measure distances and understand the relative sizes and proportions of features represented on the map.
The scale is typically depicted as a line or a bar, usually located in the corner of the map.
It is accompanied by numerical values indicating the units of measurement, such as kilometers, miles, or meters.
Thus, the scale on a map provides a reference for understanding distances and spatial relationships of geographical features present in the map.
Learn more about scale on maps here: brainly.com/question/3269934
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volume and temperature
pressure and temperature
volume and number of molecules of gas
pressure and volume
burette
ruler
graduated cylinder
Answer: Balance
Explanation: Got it right on my test