CHEMISTRY MIDDLE SCHOOL

What is a element what is a compound what is a moleculew

Answers

Answer 1
Answer:

Answer:

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Elements are made up of only one type of atom. For example, oxygen and hydrogen are elements.

A compound is a substance made up of two or more different elements chemically bonded together in a fixed ratio. The elements in a compound are held together by chemical bonds. For example, water (H2O) is a compound made up of hydrogen and oxygen atoms.

A molecule is a group of two or more atoms held together by chemical bonds. Molecules can be made up of atoms from the same element or different elements. For example, oxygen gas (O2) is a molecule made up of two oxygen atoms bonded together.

In summary, an element is a pure substance made up of only one type of atom, a compound is a substance made up of two or more different elements chemically bonded together, and a molecule is a group of atoms held together by chemical bonds.
Answer 2
Answer:

Answer: An element is the simplest substance. There are many unique elements but they are all different and cannot be broken down any further and still have their own characteristics. A molecule is 2 or more atoms that are chemically bound. A compound molecule is a molecule(2 or more atoms) that is made of 2 or more elements.

Explanation:  atoms that are chemically bound Molecule=2 or more

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What is a safety precaution that should be taken when investigating the electrolysis of lead bromide?

Answers

You should wear eye Protection

Wear Gloves and wash hands after the investigation.

Lead bromide is toxic and dangerous for the environment.

Bromine is corrosive, toxic and very dangerous for the environment.

What are two ways in which the suns energy can be captured and used?  How can both be used in a home?

Answers

The following exist:

Artificial photosynthesis: Plants can photosynthesize, but we can do it artificially to power anything requiring energy.

Solar thermal energy or STE is a process where the light is reflected from a mirror or lense to heat up anything. 

Photovoltaics or Heat collectors (Solar panels): they absorb the sun's electromagnetic energy and converts it into electricity. 

All of these technologies are very similar to each other... this was a good question

Photosynthesis is a great example: plants use the sun's energy to grow and reproduce. Solar energy-power from the sun is a vast and inexhaustible resource that people have recently discovered and it's used for light and heat.  

How do crystal systems differ from eachother

Answers

The different crystal systems differ from each other in the angles between the axes and the lengths of the axes.

There are seven crystal systems:

  • Cubic: The cubic crystal system has three axes that are perpendicular to each other and of equal length.
  • Tetragonal: The tetragonal crystal system has three axes that are perpendicular to each other, but one axis is longer than the other two.
  • Orthorhombic: The orthorhombic crystal system has three axes that are perpendicular to each other, but none of the axes are of equal length.
  • Monoclinic: The monoclinic crystal system has three axes, two of which are perpendicular to each other and the third is at an angle to the other two.
  • Triclinic: The triclinic crystal system has three axes that are not perpendicular to each other.
  • Trigonal: The trigonal crystal system has three axes that are equal in length and intersect at 120-degree angles.
  • Hexagonal: The hexagonal crystal system has three axes that are equal in length and intersect at 120-degree angles, and a fourth axis that is perpendicular to the other three axes.

The cubic crystal system has the highest symmetry, while the triclinic crystal system has the lowest symmetry. The symmetry of a crystal system determines the properties of the crystal, such as its hardness, density, and electrical conductivity.

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A crystal structure is composed of a unit cell, a set of atoms arranged in a particular way; which is periodically repeated in three dimensions on a lattice.
Crystal are classified according to the possible relations of the crystal axes.This classification is called as crystal system.

when gravity causes a huge amounts of rock or soil to be carried down a slope this form of erosion is referred to as a

Answers

Mudflow or landslide

Answer:

erosion

Explanation:

Which of the following is NOT correct about elements?(10 Points)

A. Elements cannot be broken down into simpler substances.

B. Elements are represented by chemical formulas.

C. Elements are pure substances.

D.Elements can combine chemically to form compounds.

Answers

Answer:

It is B.

All the other answers are true.

A element can not be simpler

Final answer:

The correct answer is B. Elements are represented by chemical formulas.

Explanation:

Out of the given options, the correct answer is B. Elements are represented by chemical formulas.

Chemical formulas are used to represent compounds, not elements. Elements are pure substances that are made up of only one type of atom and cannot be broken down into simpler substances. They are represented by their chemical symbols, such as H for hydrogen and O for oxygen.

For example, water is a compound made up of two elements: hydrogen and oxygen. The chemical formula for water is H2O, where H represents hydrogen and O represents oxygen.

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Which is a binary ionic compound?

Answers

there is no choices but A binary compound is a compound composed of only two elements. Binary compounds composed of a metal and a non metal and are named as ionic compounds.

Lithium fluoride  LiF  

Lithium chloride  LiCl  

Lithium phosphide  Li3P  

Beryllium fluoride  BeF2  

Beryllium chloride BeCl2  

Beryllium bromide BeBr2  

Beryllium iodide BeI2  

Beryllium phosphide Be3P2

Boron fluoride  BF3  

Boron chloride BCl3

hope this helped :) pls give branliest

A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal.
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