HCl reacts with O2 as follows: 4HCl+O2→2Cl2+2H2O When 1.79 g of HCl reacts with 5.68 g of O2 , which statement applies?

Answer:

sitting n front of class

reading out loud

and being stressed

and being bullied

Explanation:

Answer:

C

Explanation:

There are roughly 454 grams for every pound. The conversion factor would look like this for converting 2 lbs of a sample into grams:

2lbs sample (454g sample/1lb sample) = sample in grams.

Answer:

Gas

Explanation:

I believe that it is usually a gas on Earth.

Answer:

-COOH

-CHO

-CO

-NH2

-X(-Cl, -Br, -I)

-RCOOR(R= Alkyl group)

-C6H5

Answer:

1 mol of cl2 contains 71 g

3 mol of cl2 will contain÷

3×71=213 g

Explanation:

There ;3

Answer:

213 g

Explanation:

multiply 3 moles by relative atomic mass of chlorine which is 35.45×2 because its two chlorines and your answer will be 213g

An experiment is performed to study how the change in some variables affects other related variables.

I can't see the diagrams but I can give you general answers for each statement.

1) We define a good experiment as an experiment where only one variable is tested at the time, this is because this allows the scientists to isolate the impact of that variable in the experiment.

"Since only one variable was changed in this experiment, this is called a good  experiment."

2) The independent variable is the variable that the scientists can change in an experiment, in this case, we know that she does change the hours of light that each plant gets, so we can conclude that the independent variable is the time of light exposition that each plant gets.

"The independent variable in this experiment is the time of light exposition"

3) The dependent variable in an experiment is the variable that reacts to the changes in the independent variable, it usually is the thing that the scientist wants to study. In this case, we know that she is studying the floration times of tobacco plants, so:

"The dependent variable in this experiment is the flowering time of tobacco plants"

4) Controlled variables are, in principle, independent variables, that are fixed for the whole experiment. We can't see the controlled variables because there are no graphs, but we can think about what we should fix in this type of experiment.

The temperature: All the plants should grow in the same temperature, as it can affect the flowering times.

The humidity: The humidity also could impact on the flowering of the plants, so we need to fix it for the 5 plants.

The strain: All 5 tobacco plants need to be from the same genetics, we know that different genetics from different parts of the world may react differently to changes in light or temperature, so the strains need to be equal.

Substrates: All the plants should be on the same substrate, so she can be sure that all the plants are getting exactly the same nutrients from the soil.

These are just some examples, if you were designing this experiment, you would see that there are a lot of variables that need to be controlled.

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Answer:

Oxygen tanks are used to store gas for: medical breathing at medical facilities and at home. breathing at altitude in aviation, either in a decompression emergency, or constantly (as in unpressurized aircraft) oxygen first aid kits.

Explanation:

Mark my answer as the brainliest!

Answer:

Alkali metals

Explanation:

Answer:

The answer should be Molecules.

Explanation:

Polymers are said to be synthetic or natural substances that are formed by joining the monomeric units together by bonds. They are long chains of molecules. Thus, option B is correct.

Polymers are macromolecules that are large and big in size that is composed of multiple chemical units of various molecules linked by chemical bonds. These substances can be natural or man-made.

The polymers are composed of monomeric units that are molecules like the starch polymer made of glucose monomeric units linked by the glycosidic linkages. They are complex and tough structures that often provide structural support and protection.

Proteins, carbohydrates, lipids, and nucleotides are polymers composed of amino acids, sugar, fatty acids, and nucleic acids. Polymers are involved in various functions in living organisms.

Therefore, option B. molecules make long chains of polymers.

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Answer:

ratio by mass

14 3

mass ratio atomic mass

14/14 = 1 3/1=3

Mass number=No of protons+No of neutrons

[tex]\\ \sf\longmapsto Mass\:No=30+30[/tex]

[tex]\\ \sf\longmapsto Mass\:No=60[/tex]

Explanation:

Here,

Protons(p+)=30

Neutrons(N⁰)=30

We know,

Atomic mass(z)=(P+)+(N⁰)

=30+30

=60

Moles of HNO  3

​  = 6.3/63 = 0.1 moles  

HNO3  has 1 atom of H , 1 atom of N , 3 atoms of O

No of atoms = moles of molecule × atomicity of atom × avogadro number

No of atoms of H =0.1×1×6.023×10^23

 = 6.023×10^22  

No of atoms of N =0.1×1×6.023×10^23

 = 6.023×10  ^22

No of atoms of O =0.1×3×6.023×10  ^23

 =  18.069×10 ^22

Answer:

the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.

Explanation:

G o o g l e

Explanation:

Stoichiometry is the calculation of reactants and products in chemical reactions in chemistry.

Answer:  80 grams

Explanation:  

2KMnO4 -> K2MnO4+MnO2+O2​

2 moles of KMnO4 would produce 1 mole of MnO2, so 1 mole of KMnO4 would produce 0.5 moles of MnO4.  The molar mass of MnO4 is 160 g/mole.  1/2 mole of KMnO4 would therefore be (160 g/mole)*(0.5 moles) = 80 grams.

Answer:

C. kilograms, seconds, moles, and Kelvin

Answer:

The water falls to the earth as precipitation, such as rain, hail, sleet, and snow. When precipitation reaches the earth's surface, some of it will flow along the surface of the land and enter surface water like lakes, streams, and rivers, as runoff. The rest of it soaks or percolates into the soil, called

Na:-

Sodium has 11 electrons so the EC followed by

[tex]\\ \sf\Rrightarrow 1s^22s^22p^63s^1[/tex]

Ca:-

Calcium has 20electrons so the EC followed by

[tex]\\ \sf\Rrightarrow 1s^22s^22p^63s^23p^63d^2[/tex]

Answer:

Option 2 is the correct answer

Explanation:

Ceramics, which mainly consist of oxides, carbides and nitrides, can withstand very high temperatures; furnaces are generally lined with such ceramics.

Answer:

Explanation:

-g

Answer:

Electronic configuration of an element gives the information of valence electrons and number of shell present in the element.

Explanation:

Electronic configuration of an element gives the information of valence electrons and number of shell present in the element. We get the information of group number after knowing valence electrons.  

The number of shells present in an element is equal to the period number. Thus, by knowing electronic configuration we know the group number and period number of an element, and the position of an element in the periodic table.

An element's electronic configuration, which identifies both its period and group, gives important details regarding its place within the periodic table.

The major energy level (shell) where the outermost electrons are found determines the period. In the electrical arrangement, the period number corresponds to the greatest energy level. The number of valence electrons, which are the electrons at the highest energy level, which are present in an element determines its group or family. Because they have the same valence electron configurations, elements in the same group exhibit comparable chemical characteristics. In conclusion, the electronic configuration helps us comprehend an element's chemical behavior and interactions with other elements by revealing an element's period based on energy levels and its group based on valence electrons.

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False is the correct answer.

Answer:

False

Explanation:

It is Energy that has the ability to cause change.

Answer:

d=m/v d=0.94

Explanation:

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