Al, Si, Mg
All other elements seem more necessary in life
Answer:
See explanation
Explanation:
Calcium carbide reacts with water to yield acetylene gas and calcium hydroxide as follows;
CaC2(s)+2H2O(g)⇋Ca(OH)2(s)+C2H2(g)
This now shows us that the equation as written in the question is wrong. Since the equation for the reaction of calcium carbide and water as shown in the question is wrong, the equation can not be balanced.
Hello!
So, we are given a ball with a density of 1100 kg/m³, and two liquids: water (1000 kg/m³) and honey (1400 kg/m³). Our goal is to determine if the ball will sink or float in the given liquids.
Let's take two common substances: water and ice. Water has a density of 1000 kg/m³ and ice has a density of about 917 kg/m³. You would notice that the ice is always floating when you put ice and water together. This would occur if you have other substances.
Here's what you should know:
- If the density of an object is greater than the liquid it is in, then that object will sink.
- If the density of an object is less than the liquid it is in, then that object will float.
Since the ball has a density of 1100 kg/m³, and water's density is 1000 kg/m³, then the ball will sink. If the ball is placed in honey, then it will float because the density of honey (1400 kg/m³) is greater than the ball's density.
Therefore, objects with a greater density than the surrounding liquid sink, while objects with a smaller density than the surrounding liquid float, which is the fourth choice.
The given question is incomplete. the complete question is:
The electron arrangement ions 
and 
are 2, 8, and 2, 8, 8 respectively.
Write the electronic arrangement of the elements X and Y.
Write the formula of the compound that would be formed between X and Y.
Answer: 1. The electronic arrangement for X and Y are 2,8, 3 and 2,8,5 respectively.
The formula of the compound formed is 
Explanation:
Electronic configuration is the arangement of electrons in an atom in order of increasing energies.
Cations are formed when electrons are lost by atoms and anions are formed when electrons are gained by atoms.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced.
Here element X is having an oxidation state of +3 called as cation and is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral
Answer:
D
Explanation:
Identifying unique features of evidence
