Answer: 3) metallic properties and atomic radius
Explanation: reference table s trust me lol
The metallic properties and atomic radius generally decrease when the elements in Period 3 on the Periodic Table are considered in order from left to right.
The correct option is (3) metallic properties and atomic radius.
As we move across Period 3 on the periodic table from left to right, the elements change from metals to nonmetals. Metallic properties generally decrease across the period because the electrons are added to the same energy level, resulting in increasing effective nuclear charge and stronger attractions between the nucleus and the valence electrons.
At the same time, the atomic radius generally decreases across the period due to the increasing effective nuclear charge, which pulls the electrons closer to the nucleus.
#SPJ3
Using the combined gas law, we find that the new pressure of the gas sample, after it's compressed and heated, is approximately 353.8 kPa.
The subject of this question is gas laws, specifically the combined gas law which states that the ratio of the product of pressure and volume and the absolute temperature of a gas is constant. We apply this law to calculate the new pressure of the gas sample. Starting from the conditions of STP (Standard Temperature and Pressure, defined as 273.15 K and 1 atm i.e., 101.325 kPa), the volume of gas is decreased from 700.0 mL to 200.0 mL and the temperature is increased from 273.15 K to 30.0 degrees Celsius (or 303.15 K in absolute terms).
We set up the equation P1*V1/T1 = P2*V2/T2, where P1 = 101.325 kPa, V1 = 700.0 mL, T1 = 273.15 K, V2 = 200.0 mL, and T2 = 303.15 K. Plugging in these numbers and solving for P2 (the new pressure), we get P2 = P1*V1*T2 / (T1*V2) = 101.325 kPa * 700.0 mL * 303.15 K / (273.15 K * 200.0 mL) = approximately 353.8 kPa.
#SPJ12
Answer:
Periodicity is best defined as:the repeating nature of physical and chemical properties with increasing atomic number.
Explanation:
The elements present in nature or discovered so far are arranged in the form of a table known as periodic table. This creation of table was started with previous scientists like
i) Dobereiner's law of triads: according to it the atomic mass of middle element is average of atomic mass of side elements.
ii) Newland's law of octave: the properties of elements are repeated after seven elements.
iii) Mendleev's periodic table: it was a regular arrangement of by then discovered elements based on their atomic mass.
Now
We have periodic table known as long form or modern periodic table. This table is based on atomic number. According to it , there is periodicity in the physical and chemical properties of elements if they are arranged in certain groups and periods based on their atomic number.
Carbonic acid dissolves limestone and other rocks. This is an example of chemical erosion. An example is in the caves. Caves are formed where rainwater as it falls through the atmosphere absorbs carbon dioxide. The carbon dioxide makes the rain acidic to react it with the limestone bedrock. The rainwater is absorbed by the soil into the ground. Then as it enters through the soil, the rainwater will absorb more carbon dioxide that is produced by the decomposers. The carbon dioxide with water reacts to form carbonic acid. The carbonic acid will react to limestone and dissolves it slowly. As the space become larger, water can enter into it.
Answer:
chemical errosion
Explanation:
A phospholipid is composed of a polar, hydrophilic phosphate group 'head' and two hydrophobic (non-polar) fatty acid tails, where one tail is unsaturated (meaning it has a double bond between carbons, leading to a kinked shape).
Phospholipids are amphipathic molecules consisting of a hydrophilic (water-attracting) head group that contains a phosphate and is attached to a glycerol molecule and a hydrophobic (water-repelling) tail that contains two fatty acid chains. This structure permits different interactions based on charge and is crucial in forming biological membranes.
A phospholipid is an amphipathic molecule, or a molecule with both hydrophilic and hydrophobic components. This structure consists of a hydrophilic phosphatase-containing group (the head), and two hydrophobic fatty acid chains (the tails). The hydrophilic head group is typically made up of a phosphate group attached to a glycerol molecule. The hydrophobic tails are generally long hydrocarbon chains comprising of either saturated or unsaturated fatty acids.
This pattern allows for the dual-loving character of the phospholipid to interact differently with substances based on their charges and allows phospholipids to play a crucial role in the formation of biological membranes such as the plasma membrane.
#SPJ11