CHEMISTRY HIGH SCHOOL

Who developed the polio vaccine? George Marshall
Jonas Salk
Marie Curie
Carlos Finlay

Answers

Answer 1
Answer: Dr. Jonas Salk developed the polio vaccine.
Answer 2
Answer: Jonas Salk developed the polio vaccine.

Related Questions

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Which of the following chemical symbols represents the element silver?A. SB. AgC. AuD. Si
1. Use the chemical equation of Photosynthesis to answer the following prompts.Answer in complete sentences.6CO2 + 6H2O --> C6H12O6 +6021. Identify evidence that a chemical reaction has occurred.2. What element is the most abundant in this chemical reaction?3. Identify the number of protons, neutrons, and electrons found in the mostabundant element.4. Identify where we would find the protons, neutrons, and electrons in theatom of this element.5. Identify the group and period of the element on the Periodic Table.swer

Which formula represents a saturated hydrocarbon

Answers

Saturated hydrocarbons are organic compounds that contain only single bonds between the carbon atoms. They are known to be the simplest organic compounds. They are termed as such because they are saturated with water. Examples are the alkanes (ethane, methane, propane, butane, etc.).

Answer:

CH4

Explanation:

I got it wrong and it should me the right answer

Which of the following is a physical property of a substance?? A. Combustion B. Corrosion C. Tendency to tarnish D. Solubility

Answers

A physical property does not change the substance. 

Solubility would be the answer since all of the rest are changing the substance. They all deal with bonds except solubility. 

Answer: D. Solubility
A physical property is any property that doesnot concern with the change of the substance. The changes in the physicalproperty can be used to describe its transformations or evolutions from itsinitial state. They are often referred to as observables. Solubility is an example of a physical property.The solubility of substance describesa state of a dissolving a powdered form in a liquid. Combustion, Corrosion andtendency to tarnish are examples of a chemical change. They are substances thatchanges its physical state and composition resulting from a chemical reaction

how many grams of ca(po4)2 would be produced when 1.5 grams of (nh4)3po4 is reacted with an excess of ca(oh)2

Answers

Molar mass :

(NH₄)₃PO₄ = 149.0 g/mol

Ca₃(PO₄)₂ = 310.17 g/mol

2 (NH₄)₃PO4 + 3 Ca(OH)₂= Ca₃(PO₄)₂ + 6 NH₄OH

2 * 149 g --------- 310.17 g
1.5 g -------------- ?

mass = 1.5 * 310.17 / 2 * 149

mass = 465.255 / 298

= 1.561 g of Ca₃(PO₄)₂

hope this helps!

Is coffee a solution, colloid, or suspension?

Answers

Coffee is considered a colloid.

What is a colloid

A colloid is a type of mixture in which particles are dispersed throughout a medium, but they are not dissolved or settled. In the case of coffee, it is made up of small particles of coffee grounds suspended in water. These particles are not completely dissolved in the water but remain dispersed throughout, giving coffee its characteristic appearance and texture.

While some components of coffee, such as caffeine and other soluble compounds, are dissolved in the water, the presence of suspended coffee particles qualifies it as a colloid.

Read more on colloid here brainly.com/question/3003333

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Short Answer: Coffee are not solution but it is colloid and suspension.

Explanation:

The cream is a foam of air suspended in an emulsion composed of vegetable oils and water. Perhaps you decide to have an orange juice, rather than a coffee - that, too, is a colloid. It is a sol, a suspension of solid particles of pulp in an aqueous continuous phase.

Consider the following equilibrium:4KO2(s) + 2H2O(g) 4KOH(s) + 3O2(g)

Which of the following is a correct equilibrium expression?

A.
`"K"_("eq") = (["KOH"]^4["O"_2]^3)/(["KO"_2]^4["H"_2"O"]^2)`

B.
`"K"_("eq") = (["H"_2"O"]^2)/(["O"_2]^3)`

C.
`"K"_("eq") = (["KO"_2]^4["H"_2"O"]^2)/(["KOH"]^4["O"_2]^3)`

D.
`"K"_("eq") = (["O"_2]^3)/(["H"_2"O"]^2)`

Answers

Answer:

Answer is option D

Explanation:

The explanation is embedded in the word document attached

Answer:

Keq= [KOH]^4 [O2]^3/[[KO2]^4

Explanation:

4KO2(s) + 2H2O(l) → 4KOH(s) + 3O2(g)

Looking at the equation, the correct equilibrium expression is shown in the answer. The equilibrium constant for a reaction is given by the active masses of species involved in the reaction. The relative molar coefficients of species are raised to the power of their molar concentrations to give the active mass of each specie. This active mass now goes into the equilibrium equation.

Water is not included in the equilibrium equation because, as a solvent, it is present in large excess.

How do the energy and the most probable location of an electron in the third shell of an atom compare to the energy and the most probable location of an electron in the first shell of the same atom?(1) In the third shell, an electron has more energy and is closer to the nucleus.
(2) In the third shell, an electron has more energy and is farther from the nucleus.
(3) In the third shell, an electron has less energy and is closer to the nucleus.
(4) In the third shell, an electron has less energy and is farther from the nucleus.

Answers

The answer is (2). You can think about this question in terms of the Bohr's model of the atom or in terms of quantum chemistry. In the Bohr model, electrons exist in discrete "shells," each respresenting a fixed spherical distance from the nucleus in which electrons of certain energy levels orbit the nucleus. The larger the shell (the greater the "orbit" radius), the greater the energy of the "orbiting" electron (I use quotations because electrons don't actually orbit the nucleus in the traditional sense, as you may know). Thus, according to the Bohr model, a third shell electron should be farther from the nucleus and have greater energy than an electron in the first shell.The quantum model is differs drastically from the Bohr model in many ways, but the essence is the same. A larger principal quantum number indicates 1) greater overall energy and 2) a probability distribution spread a bit more outward.
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