What is a main reason why the scientific model of atoms is considered a theory rather than a law? It has been proven as a fact. It has been changed over time. It predicts but does not explain. It has stayed the same for a long time.

Answers

Answer 1

Answer: It has been proven as a fact

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Which is an example of pseudoscience? A. use of X-rays to observe the bones of the arm B. use of DNA analysis to determine paternity C. use of vaccines to prevent the occurrence of disease D. use of astrology to predict the personality of a child
Which of the following is not found in the nucleus of an atom? A. Neutron B. Electron C. Proton D. Quark
PLEASE HELP The arrows in the chart below represent phase transitions.Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid.Which arrows represent the phase transitions in which heat energy is gained?1, 2, and 32, 3, and 53, 4, and 54, 5, and 6
Molecules of 1-bromopropane and 2-bromopropane differ in(1) molecular formula(2) structural formula(3) number of carbon atoms per molecule(4) number of bromine atoms per molecule
Which is true about the dissolving process in water? Nonpolar solutes dissolve easily in water. Solute molecules surround water molecules. Molecules or ions of a solute spread throughout the water molecules. Water molecules are repelled by solute ions at the surface of the solute.

A scientist can explain how the brain recognizes odors.
True
False

Answers

True, that's because of the receptors one have got to sense the changes in the environment .

Explain why ionic compounds are formed when a metal bonds with a nonmetal but covalent compounds are formed when two nonmetals bond.

Answers

Two nonmetals have enough electrons to share some for completing, so the bonds are covalent. A metal doesn't have that much, so it gives the few electrons on its outer layer more easily than a nonmetal (there must be a nonmetal to get them). This bond is ionic.
I'm still unaware of possible bonds between 2 metals (are there any? :) )

Final answer:

Ionic compounds form when a metal and nonmetal bond, as the metal loses its valence electrons which the nonmetal gains, resulting in an ionic bond. Covalent compounds form when two nonmetals bond, as they tend to share electrons allowing them to complete their valence shells resulting in a covalent bond.

Explanation:

The formation of ionic and covalent compounds depends on the elements involved and their properties. Metals, generally, have few valence (outer shell) electrons, while nonmetals have more. When a metal and nonmetal bond, the metal tends to lose its valence electrons, becoming a positively charged ion or cation, and the nonmetal gains these electrons, becoming a negatively charged ion or anion. This transfer of electrons results in an ionic bond.

On the other hand, when two nonmetals bond, they tend to share electrons because neither atom can completely overcome the other's attraction for electrons. These shared electrons allow them to complete their valence shells. This sharing of electrons results in a covalent bond.

Learn more about Ionic and Covalent Compounds here:

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Explain by referring to the atomic structure of carbon. Compare between carbon fiber and iron (Fe) in terms of durability and performance.

Answers

Carbon is a chemicalelement with a chemical symbol "C". It has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6electrons. Since carbon is in the second row (or second period), it has 2 electron orbits. Use the clay to make your protons and neutrons in the nucleus.

However, some factors do influence its durability, like its matrix. Furthermore, the intense use of composites and environmental factors could affect its durability and potential applications.

Difference between carbon fiber and iron

Carbonfiber is five-times stronger than iron( FE ) and twice as stiff. Though carbon fiber is stronger and stiffer than Iron (Fe) it is lighter than steel; making it the ideal manufacturing material for many parts. These are just a few reasons why carbon fiber is favored by engineers and designers for manufacturing.

Steel with more carbon is harder and stronger than pure iron, but it also breaks more easily (brittle).

Answers

Capillary action is defined as the ability of a liquid to go up a narrow space without the help or opposition of external forces. One of the most important factors affecting capillary action is the intermolecular forces within a substance. The higher the IMF, the greater the capillary action. The H-bonding in water gives it greater IMF than acetone, so water has greater capillary action.

Liquid going up a thin space without the assistance off an opposite or opposing force

Properties that do not depend on the amount of matter present are called _________________.a.intensive property
b. extensive property

Answers

the answer is b) extensive just took the test.

Answer:

a.intensive property

Explanation:

Properties that do not depend on the amount of matter present are called

But B answer is not correct

chloetoder is wrong answer

In the same science fair,Tina ask the question "does caffeine increase the heart rate of an earthworm?" In test 1,she measures the heart rate by looking at the earthworm under a microscopes, the heart rate if 50 beats per minute. In test 2,she places a few drops of caffeine on the earthworms skin and measures the rate again.in this test the heart rate is 68beats per minuteWhat is the independent variable in this experiment
What is the dependent variable in this experiment
Tina's experiment should have included a hypothisis .in a complete sentence,suggest a hypothesis for Tina's experiment

Answers

The independent variable is the one that does not change depending on other variables - so here it would be the presence or the absence of caffeine - this is dependent on Tina's actions, but not on other variables in the experiment. The dependent variable is the heart rate - it is assumed to depend on the presence or absence of caffeine. A hypothesis could be that "Caffeine causes an increase of heart rate in earthworms" - and this hypothesis is what the experiment is testing.

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A sample of vinegar has a pH of 5, and a sample of rainwater has a pH of 6. Which of the following statements best describes these two substances?A. Both samples are bases, and vinegar is more basic.B. Both samples are acids, and vinegar is more acidic.C. Both samples are bases, and rainwater is more basic.D. Both samples are acids, and rainwater is more acidic.

Which subatomic particle is not found in the nucleus of an atom

The relatively high boiling point of water is due to water havingA) hydrogen bondingB) metallic bondingC) nonpolar covalent bondingD) strong ionic bonding

A brick has a volume of 475 cubic centimeters and a mass of 912 grams. Calculate itsdensity.Write your answer to the hundredths place