The answer is A
The bacteria that cause disease are known as pathogens. The term pathogen is used to refer to all types of disease causing microorganisms. These include bacteria, fungi, protozoa and fungi.
Bacteria. Microscopic organisms that come in many shapes and sizes. Some bacteria that cause disease in man are Salmonella typhi which causes typhoid and Streptococcus pyogens which causes sore throat.
Virus. A virus is a microscopic entity much smaller than even bacteria and can only exist inside a host such as a cell. It cannot live on its own. Some viruses that cause disease are HIV which causes AIDS and Rhino virus which causes colds.
Fungi. These are a group of unicellular or multicellular microscopic organisms that live by feeding on organic matter. A type of fungus that causes disease is Trichophyton mentagrophyte which is responsible for athlete's foot.
Protozoa. A group of one celled organisms which live in water. Entamoeba histolytica is a protozoa, an amoeba which causes amoebic dysentery in man.
b. limited life.
c. difficulty in raising capital.
d. double taxation of the corporation s income and of dividends paid to shareholders.
Option D. A major disadvantage of a corporation is double taxation of the corporation's income and dividends paid to shareholders.
A major disadvantage of a corporation is the double taxation of the corporation's income and dividends paid to shareholders. This means that not only is the corporation subject to income tax on its profits but the dividends distributed to shareholders are also taxed as the shareholders' personal income. This results in a higher overall tax burden for shareholders, making it a major disadvantage of a corporation.
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a pure substance that has a fixed volume and shape.
B.
a pure substance that does not have a fixed volume or shape.
C.
an unevenly distributed mixture of two or more components.
D.
an evenly distributed mixture of two or more components.
Answer:
A chemical reaction is a process in which one or more substances (reactants) are transformed into one or more different substances (products). During a chemical reaction, chemical bonds between atoms in the reactants are broken, and new bonds are formed to create the products. This transformation often involves the rearrangement of atoms and the exchange of energy.
Key characteristics of a chemical reaction include:
1. **Reactants:** These are the substances that undergo the chemical transformation. They are present before the reaction begins.
2. **Products:** These are the substances that result from the chemical reaction. They are formed as a result of the rearrangement of atoms from the reactants.
3. **Chemical Equations:** Chemical reactions are typically represented using chemical equations, which show the reactants on the left side and the products on the right side. For example, the reaction between hydrogen and oxygen to form water is represented as: 2H2 + O2 → 2H2O.
4. **Conservation of Mass:** In a closed system, the total mass of the reactants is equal to the total mass of the products, according to the law of conservation of mass.
5. **Energy Changes:** Chemical reactions may release or absorb energy. Reactions that release energy are exothermic, while those that absorb energy are endothermic.
Chemical reactions are fundamental to chemistry and play a crucial role in various natural and industrial processes. They are involved in everything from the digestion of food in our bodies to the combustion of fuel in engines, and they underlie the synthesis of a wide range of substances, from pharmaceuticals to materials used in everyday life. Understanding and controlling chemical reactions is essential in fields such as chemistry, biology, and engineering.
Answer:
a chemical reaction is a process in which two or more chemicals react with each other
A. The FDA is the only organization that can test if health actually improves.
B. Tests that are performed by any company which benefits financially are considered unreliable.
C. The FDA tests give reliability to the results of improved health obtained by each company.
D. Tests performed by the FDA follow established scientific methods, but those performed by companies do not.
Answer is: C. The FDA tests give reliability to the results of improved health obtained by each company.
The FDA (The Food and Drug Administration) is a federal agency of the United States Department of Health and Human Services.
The FDA controls food safety, tobacco products, dietary supplements, prescription, pharmaceutical drugs, vaccines, biopharmaceuticals, blood transfusions, medical devices, electromagnetic radiation emitting devices, cosmetics and animal food.
Answer: 61%
The reaction equation should be
CaF2 + H2SO4 → 2HF + CaSO4
For every 1 molecule CaF2 used, there will be 2 molecules of HF formed. The molecular mass of CaF2 is 78/mol while the molecular mass of HF is 20g/mol. If the yield is 100%, the amount of HF formed by 112g CaF2 would be: 112g/(78g/mol) * 2 * (20g/mol)=57.43g
The percentage yield of the reaction would be: 35g/57.43g= 60.94%
Vegetation slows and prevents sediment loss in rivers and streams by binding the soil together and slowing down the flow of water. Shade from plants also helps reduce phytoplankton growth.
Vegetation plays a crucial role in slowing and preventing sediment loss in rivers and streams. The roots of plants help bind the soil together, reducing erosion caused by the force of water. As water flows through vegetation, it is slowed down, allowing sediment to settle out. Additionally, plants provide shade, which helps keep the water temperature lower, creating an environment less suitable for phytoplankton growth.
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