CHEMISTRY MIDDLE SCHOOL

What’s the molar mass of Lead-208

Answers

Answer 1
Answer: Lead is a basic metal and almost 11 isotopes of Lead are reported. The isotopes with greater natural abundance are as follow;

1) ²⁰⁸Pb with abundance 52.4 %

2) ²⁰⁶Pb with abundance 24.1 %

3) ²⁰⁷Pb with abundance 22.1 %

4) ²⁰⁴Pb with abundance 1.4 %

Molar mass of ²⁰⁸Pb:

Molar mass of any element is the total of number of protons, neutrons and electrons.
As, number of protons in Lead are 82 then in ²⁰⁸Pb isotope number of neutrons are...

# of Neutrons  =  M.mass - # of protons

# of Neutrons  =  208 - 82

# of Neutrons  =  126

Result:

Molecular Mass of Lead (²⁰⁸Pb) is 208 amu.

# of Protons in ²⁰⁸Pb  = 82

# of Neutrons in ²⁰⁸Pb = 126

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How many carbon dioxide molecules are needed to produce 5 glucose molecules?

Answers

For each molecule of glucose produced: 6 water water molecules are oxidized, and become the source of electrons for carbon dioxide reduction. 6 molecules of carbon dioxide are required, one for each carbon atom in glucose. 6 molecules of oxygen are produced as a by product of water oxidation.

Which describes how radiation moves?A:Radiation moves from a cooler object to a warmer object
B:Radiation moves from a warmer object to a cooler object
C:Radiation moves from a warm object to an object of the same temperature.
D:Radiation moves from a cool object to an object of the same temperature

Answers

Hey wademcelroy2005, thanks for submitting your question to Brainly!

The answer to your question is B:Radiation moves from a warmer object to a cooler object

Answer: B

Explanation:LATE IM LATE BUT ITS

Convert 11 degrees ° Fahrenheit to Celsius. (Round to the nearest tenth.)

Answers

Answer:

-12

Explanation:

11 degrees fahrenheit = -11.6667

Rounded it the nearest thenth is -12

Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”What topic is the teacher most likely talking about?

Answers

Explanation:

The teacher is most likely talking about the fractional distillation process.

Fractional distillation: It is a separation technique used to separate different components of the given mixture on the basis of their difference in boiling points of the different components. The component with lowest boiling point will get separate out first from the mixture and the vapors formed from boiling are condensed in a separate container.

So, when the fractional distillation of mixture of oils and fuels is carried out  gasoline will separate out first due to lower boiling temperature and then kerosene followed by diesel and others (fuels and oils).

Answer:

distillation of a mixture

Explanation:

Which of the following best describes a mixture? *two or more substances combine and cannot be separated

two or more substances combine chemically

two or more substances combine but keep their physical properties

two or more substances combine and create an irreversible reaction

Answers

Mixtures are combination of two or more substances which can be separated based on their physical properties. Hence, option c best describes a mixture.

What are mixtures?

Mixtures are substances formed by the combination of two or more individual components. The mixing can be of physical or chemical type. The individual components can be separated using some techniques based on their physical properties.

There are both homogenous mixtures and heterogenous mixtures. In homogenous mixtures the components are uniformly mixed and form a single phase.

Heterogenous mixtures are composed of components forming different phases. They can be easily separated using simple techniques. Irrespective of the type of mixing, the physical properties of the components are maintained as such in a mixture. Hence, option c is correct.

Find more on mixtures:

brainly.com/question/24898889

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Answer: two or more substances combine but keep their physical properties or two or more substances combine and create an irreversible reaction.

Explanation: Because i tried the other two and they didnt work so yeah thats life and i got a d on my test thx for the wrong info person before me.

Which quantity represents the number of protons in an atom?(a) atomic number
(b) oxidation number
(c) number of neutrons
(d) number of valence electrons

Answers

The atomic number is equal to the number of protons in an element.
The oxidation number and valence electrons can vary depending on whether it is an ion or not. The number of neutrons can also vary depending on what isotope the atom is. However, the number of protons cannot be changed without changing the identity of the base atom itself.
The answer is (a) atomic number

Atomic number = no. of protons = no. of electrons
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