CHEMISTRY MIDDLE SCHOOL

What is the name of the large dome-shaped muscle under your lungs that helps you breathe?

Answers

Answer 1
Answer: It's Your Diaphragm!
Answer 2
Answer: That would be your diaphragm :)

Related Questions

Which of these elements is a metal?
Calculate the mass of barium sulphate formed when 500 cm3 of 1 mol dm sodium sulphate solution is reacted completely with barium chloride solution.[ Relative atomic mass : O = 16; S = 32; Ba = 1371​
Compare and contrast substances and mixtures with two examples
The following reaction shows the process of rusting. 4Fe + 3O2 2Fe2O3 This chemical reaction should be classified as _____.
A force that keeps objects in motion from going on forever

Atomic size generally______.A. decreases as you move from top to bottom within a group

B. remains constant within a period

C. decreases as you move from left to right across a period

D. increases as you move from left to right across a period​

Answers

Option C, decreases as you move from left to right across a period

As you move from left to right across a period, the atoms get more and more protons. These protons pull on the electrons, making the atoms progressively smaller and smaller because of the increasing pull.

Final answer:

Atomic size generally increases as you move from top to bottom within a group due to increase in the principal quantum number. However, atomic size generally decreases as you move from left to right across a period, as the added protons and electrons increase the effective nuclear charge and pull the electrons in closer.

Explanation:

In the context of atomic size on the periodic table, there are two primary trends to notice: Atomic size generally decreases as you move from left to right across a period. This happens because as we move from left to right, we add a proton to the nucleus and an electron to the valence shell with each successive element, thereby increasing the effective nuclear charge and pulling the electrons in tighter to the nucleus.

Atomic size generally increases as you move from top to bottom within a group. This is due to the increase in the principal quantum number, causing the atomic radius to grow as there are more electron shells.

These observations come from understanding the electronic structure of elements and how they influence the properties like atomic size, ionization energies and electron affinities that vary periodically as the electronic structure of the elements changes.

Learn more about Atomic Size here:

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How have the changing sea levels shaped Florida's landform?

Answers

This shaped FL into  7 regions, like lakes, rivers, separate lands, etc. 
Its shaped Florida into 7 regions through lakes, streams, rivers ect

How to do balancing equations

Answers

It's quite hard to explain without an example, but I'll give it a go:

Basically, you have to count the number of an element on one side of the equation, then count it on the other, and the aim of balancing the equation is to get the 2 values to be the same (as mass cannot be created or destroyed).

This involves multiplication of the molecule(s) on either side of the equation in order to balance the whole thing. Note this is not like maths, you dont have to do the same to both sides, but you do have to multiply out entire molecules - you cannot multiply just the H2 in H2O for example.

A reasonably basic example of this balancing is:

Fe + Cl2 = FeCl3

The first thing I notice is that there is an even number of Cl atoms on the left, and an odd number on the right, so the first thing I'll do is multiply the one on the right to get it to an even number, ie by 2.

Fe + Cl2 = 2(FeCl3)

Expanding that gives Fe2Cl6 (although you dont write it like that). So we need to get 6 Cl atoms and 2 Fe atoms by multiplying the left hand molecules by amounts if possible. If you look at that, we can achieve that, by multiplying Cl2 by 3, and Fe by 2.

2Fe + 3Cl2 = 2FeCl3
And there you have your balanced equation, you'll notice that the number of any given element has the same number of atoms on both sides of the equation.

What is my skeletal system made of

Answers

your skeletal system consists of all the 206 bones and the 360 joints in the human body. This includes the cells, protein fibers and minerals that make up your bones.

How much does a gold bar wiegh and how much is it wotrth

Answers

It depends on the gold bar.  Gold bars come in all diferent sizes.  However how much its worth depends on how big it is.  Gold is $1,320 per ounce.

Which gas law has the assumptions of a fixed amount and volume of a gas?Boyle’s law


Gay-Lussac’s law


Avogadro’s law


Charles’s law

correct answer is gay lussacs law

Answers

Gay lussac is the answer

Answer:

Gay-Lussac’s law

Explanation:

Gay's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.
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Please help!!!! A group of students is studying convection currents. They fill two identical balloons with the same amount of helium. One balloon is placed in a freezer and the other in an area with warm air. After 10 minutes, the balloons are released from a height of 1 meter. Which of the following do the students most likely observe? A. The balloons both rise. The cold balloon is larger than the warm balloon.B. The balloons rise at the same rate. Both balloons are the same size.C. The warm balloon expands and rises. The cold balloon shrinks and sinks.D. The cold balloon expands and rises. The warm balloon shrinks and sinks.
Most covalent compounds are very ______ electrolytes in solutions. A. Strong B. Weak C. Acidic D. Flammable
Henry divides 1.060 g by 1.0 mL to find the density of his water sample. How many significant figures should he include in thedensity value that he reports?