CHEMISTRY MIDDLE SCHOOL

The number of electrons in atoms can change when elements combine to formA. isotopes
B. molecules
C. compounds

Answers

Answer 1
Answer:

The number of electrons in an atom changes when elements combine to form compounds. The molecules are the combination of elements where the number of total electrons increases.

What are compounds?

Compounds are formed by the combination of atoms of different elements. The properties of compounds are different from that of the individual elements which constitutes the compound.

Molecules are the combination of same kind of elements . They are formed through chemical bonding. There are different types of bonding such as covalent bonding, ionic bonding etc.

Isotopes are atoms of same element having different mass numbers. When elements combines through   chemical bonding, the number of valence electrons surrounding the atom changes.

To find more on compounds, refer here:

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Answer 2
Answer: It can change in C. compounds to change when elements combine that will form 

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_____________________are the cules that the continents seem to fit together like pieces of a puzzles.

Answers

Continental Drift are the clues that the Continent seem to fit together like of a puzzle.
The Continental Drift are the cules that the continents seem to fit together like pieces of a puzzles. Abraham Ortelius discovered the Continental Drift in 1596.

What is the collection of protons and neutrons in the center of an atom called

Answers

If I am correct it should be nucleons

The collection of protons and neutrons in the center of the atom is called the nucleus.

After data are collected, they are often arranged in a(n) ___________???

Answers

Data are often arranged in some sort of table or spreadsheet. This allows the researcher(s) to be able to run statistical models on the data as a way of finding and understanding trends that may occur. This table also gives a form of proof for those looking to replicate the findings.

In a longitudinal wave the motion of a disturbance is _____ to the wave motionA.parallel
B.opposite
C.perpendicular
D. in the same direction

Answers

Answer: The correct answer is Option A.

Explanation:

Waves are characterized into two types:

  1. Transverse wave: These waves are the waves where, particles of the medium travel perpendicularly to the direction of the wave. These waves do not require any medium to travel and can travel in vacuum also. For Example: Light waves.
  2. Longitudinal waves: These waves are the waves, where particles of the medium move in the direction of the wave which means that the particles move parallel to the direction of the wave. These waves requires a medium to travel. For Example: Sound Waves.

Hence, the correct answer is Option A.
It is parallel. The direction of energy transfer is parallel to oscillation of particles in the medium. 

Ca(OH)2 + H3PO4
Double Replacement Reaction

Answers

3Ca(OH)2 + 2H3PO4➡️Ca3(PO4)2+6H20

Match each reaction to its correspond typeSynthesis/ Combustion
decomposition
single replacement
double replacement
combustion ​

Answers

Answer: A. synthesis or combination reaction

B. Double replacement reaction

C. Single replace ment reaction

D. Combustion

E. Decomposition

Explanation: A is synthesis since A + B --> AB. It produces a single product

B. is double replacement since Ca replaces Al and vice versa

C is single replacement where Mg kicks out Fe in the product formation

D is combustion where a hydro carbon rteacts with oxygen gas to form CO2 and H2O

E is decomposition ( AB) ---> A + B

Answer:

A. Synthesis

B. Double replacement

C. Single replacement

D. Combustion

E. Decomposition.

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