Answer: The report prepared is a nontestimonial hearsay.
Explanation:
The nontestimonial hearsay can be defined as the expert opinion or statement given casually and not for the purpose of keeping or considering it as record by the government agent or agency. Here the given conclusion provided by the chemical expert is an example of nontestimonial hearsay because it is not the output of experimental and analytical procedures instead it is a casual opinion. Testimonial hearsay include the evidences that are based on detailed and thorough analytic procedures.
EN LA MINA DE CHUQUICATAMA SE EXPLOTA DIFERENTES METALES COMO SER EL COBRE , AL ESTAR EN CONTACTO CON EL AIRE DICHO METAL SE LLEGA A OXIDAR FORMANDO DOS CLASES DE OXIDO¿CUALES SON ESTOS DOS OXIDOS?
Answer:
Los dos óxidos que forma el cobre son óxido de cobre (I) y óxido de cobre (II) (Cu₂O y CuO, respectivamente).
Explanation:
El cobre posee dos estados de oxidación más comunes, los cuales son +1 y +2.
En contacto con aire el cobre se puede oxidar para dar lugar al óxido cuproso u óxido de cobre (I):
4Cu + O₂ → 2Cu₂O
Dicha oxidación también puede dar lugar a la formación del óxido cúprico u óxido de cobre (II):
2Cu + O₂ → 2CuO
La formación del óxido cúprico se favorece a temperaturas mayores a la del ambiente (por encima de los 300 °C).
Por lo tanto, los dos óxidos que forma el cobre son óxido de cobre (I) y óxido de cobre (II) (Cu₂O y CuO, respectivamente).
Espero que te sea de utlidad!
1) The percentage of oxygen in dry air is _______
A. 0.1
B. 1.0
C. 21
D. 79
2) The composition of the Earth’s earliest atmosphere was different to that of the present atmosphere. Which of these gases was present in large amounts in the Earth’s earliest atmosphere?
A. Oxygen
B. Carbon dioxide
C. Ammonia
D. Nitrogen
Answer:
1) The percentage of oxygen in dry air is _______
C. 21
2) The composition of the Earth’s earliest atmosphere was different to that of the present atmosphere. Which of these gases was present in large amounts in the Earth’s earliest atmosphere?
B. CARBON DIOXIDE
Hope it helps
have a nice day
Answer: The percentage of oxygen in dry air is . 21
Explanation: Ammonia gases was present in large amounts in the easth7s earliest atmosphere
Hope it will help you
Please a little help in this I will really appreciate it
Answer:
b is your answer...........
Select the structure that corresponds
to the name:
decanoic acid
COOH
A.
B. CH3(CH2)7COOH
C. both
Answer:
b
Explanation:
Molecular formula of Decanoic Acid is C₁₀H₂₀O₂ therefore Option A is the right answer.
What is Decanoic Acid ?Decanoic Acid is a C10 , straight chain , saturated fatty acid . Its general formula is C₁₀H₂₀O₂ .
In the first option we can see a straight chain , saturated fatty acid and the molecular formula is also same as decanoic acid .
In second option the molecular formula is C₉H₁₈O₂ which is not same as Decanoic Acid.
Hence option A is the right answer.
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Can someone please do a True or false for these PLEASE
Answer:
true
false
false
true
false
true
true
false
false
true
true
if drop a watermelon from the top of one of the tower dorms at CSU, and it takes 3.34 seconds to hit the ground, calculate how tall the building is in meters and then convert into feet.
Answer:
179.5 feet
Explanation:
54.718 m converted to 179.5 feet.
Which is a possible consequence of decreasing air quality resulting from global warming? drying out of fertile lands flooding of low-lying coastal areas melting of glaciers and polar ice caps decrease in population due to health threats The correct answer is decrease in population due to health threats.
Answer: A decrease in population due to health threats is a possible consequence of decreasing air quality resulting from global warming.
Explanation:
When average temperature of Earth keeps on increasing for a longer period of time due to greenhouse gases, increased level of carbon dioxide and other gases etc then it is called global warming.
As humans use oxygen to sustain which is present in the air. So, when there will occur decrease in air quality that results from global warming then it means more illness or diseases will be there.
Hence, people will tend to die more often because of decrease in the air quality their health is getting affected.
Thus, we can conclude that a decrease in population due to health threats is a possible consequence of decreasing air quality resulting from global warming.
Answer:
A decrease in population due to health threats is a possible consequence of decreasing air quality resulting from global warming.
Explanation:
Hope this helps.
Iron reacts with copper (I) sulfate to produce copper and iron (II) sulfate. If 4.32x10^25
particles of copper (I) sulfate react, how many moles of copper will be produced?
Fe + Cu2504 --> FeSO4 + 2Cu
Answer: 143.48 moles of copper will be produced.
Explanation:
We are given:
Number of particles of copper (I) sulfate = [tex]4.32\times 10^{25}[/tex]
According to the mole concept:
[tex]6.022\times 10^{23}[/tex] number of particles is contained in 1 mole of a compound
So, [tex]4.32\times 10^{25}[/tex] number of particles will be contained in = [tex]\frac{1}{6.022\times 10^{23}}\times 4.32\times 10^{25}=71.74mol[/tex] of copper (I) sulfate
The given chemical equation follows:
[tex]Fe+Cu_2SO_4\rightarrow FeSO_4+2Cu[/tex]
By the stoichiometry of the reaction:
If 1 mole of copper (I) sulfate produces 2 moles of Cu
So, 71.74 moles of copper (I) sulfate will produce = [tex]\frac{2}{1}\times 71.74=143.48mol[/tex] of Cu
Hence, 143.48 moles of copper will be produced.
The number of Atoms present in one mole of an element is equal to Avogadro Number. Which One Of the Following contains the greatest number of Atoms? (1)4g He (2)46g Na (3)0.40g Ca (4) 12g He
Answer:
Thus, the element containing the greatest number of atoms is 12 g He. Thus, the correct option is (4) 12 g He. Note: The number of atoms of a compound is Avogadro's number for 1 mole of compound. The number 6.022×1023 is known as Avogadro's number.
Explanation:
(4)✔️ 12 g He
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iammallikaAnswer:
120gram I think so this is the answer if the answer is correct plz mark me as brainliest.
If you refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to:
Answer: Revoke the driver's license for at least 12 months
Explanation:
Chemical tests are used in order to measure the amount of drugs or alcohol that is in the body of a person when the person was arrested. To do this, samples of the urine or blood of the person can be taken and the result will be used to know if the person was driving under the influence of alcohol or not.
If the person refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to revoke the the driver's license of the person for at least 12 months.
Describe what is happening within the system when it is at equilibrium in terms of concentrations, reactions that occur, and reaction rates.
Answer:
Describe what is happening within the system when it is at equilibrium in terms of concentrations, reactions that occur, and reaction rates.
Explanation:
The chemical equilibrium state is the state where the rate of forward reaction becomes equal to the rate of backward reaction.
At this stage the change in concentration of reactants becomes equal to the change in concentration of products.
The reaction will never cease.
That is the reason chemical equilibrium is called dynamic equilibrium.
So, forward and backward reactions will be taking place continuously at equal rates.
What pollutants can contribute to acid precipitation and how are these pollutants generated?
Answer:
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
hope it helps
stay safe healthy and happy...Sulfur dioxide and nitrogen oxides can contribute to acid precipitation.
What are pollutants?A pollutant is a chemical or biological substance which harms water, air, or land quality.
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
Learn more about the pollutants here:
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solve this question please! it have 3 options which one of them is correct option
Answer:
I think option two (2) is the correct answer
What is the difference between a continuous spectrum and a line spectrum? Give a source of each
kind of spectrum!
¿Qué características distinguen a los coloides de otras mezclas?
What phrase describes a good scientific question?
has a wide focus
addresses a gap in knowledge
does not lead to a testable hypothesis
O has a simple yes or no answer
vious Activity
a) The bubbles must be negatively charged.
b) The bubbles must be positively charged.
c) The bubbles must have the opposite charge to the charge on the student.
d) The bubbles must have the same charge as the charge on the student.
Answer:
C
Explanation:
like charges repel each others so if they have the same charge they will move away from each other
Oxygen is a diatomic element.why give reason.
Answer:
Diatomic molecules contain two atoms that are chemically bonded. If the two atoms are identical, as in, for example, the oxygen molecule (O2), they compose a homonuclear diatomic molecule, while if the atoms are different, as in the carbon monoxide molecule (CO), they make up…
Explanation:
yei hoo arko aaxaina ...
the chemicals used in the preparation of carbondioxide gas are???
Answer:
Calcium carbonate and hydrochloric acid
Explanation:
The reaction of Calcium carbonate and Hydrochloric acid leads to the formation of Calcium Chloride and Carbon (IV) Oxide gas.
CaCO3 + 2HCl => CaCl2 + CO2 + H2O
HELPPPPPPPP i accidentally pressed on c
Answer:
a
Explanation:
I'm not completely sure tho veary sorry if it's wrong
Answer:
the answer is C
Explanation:
as the yeast feeds on sugar and yields the ATP per glucose molecule and Carbon dioxide
Ecstasy is one example of which of the following?
Depressants
Narcotics
O Club drugs
Stimulants
Answer:
Narcotics
I think ans is
Explanation:
tropicaia
Ecstasy, also known as MDMA, is used recreationally, so it can be called a club drug. However, it is illegal in the US, so it would be considered a narcotic as well. The effects it has are also of the stimulant variety, so they would fall under that category as well. It is definitely not a depressant.
If the sky is actually black, and the water is actually clear, where does the blue color for the sky and water come from?
Answer:
that the water is blue because of the way water absorbs light, the way particles in the water scatter light, and also because some of the blue light from the sky is reflected
help sdfghrthfbfdve aahhhhhhhh
WHAT IS PHOTOSYNTHESIS??
Answer:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Answer:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
In which of the following will the density increase?
Group of answer choices
An iron bar is heated.
A lead weight is moved from sea level to the top of a high mountain.
A sample of water is frozen.
A diamond is submerged in water.
A sample of chlorine gas is compressed.
How many bonds can a carbon atom form?
O A. 1
B. 2
C. 4
O D. 3
Calculate the molecular weight of a dibasic acid.0.56gm of which is required 250ml of N/20 sodium hydroxide solution for neutralization.
Answer: The molecular weight of the dibasic acid is 89.6 g/mol
Explanation:
Normality is defined as the amount of solute expressed in the number of gram equivalents present per liter of solution. The units of normality are eq/L. The formula used to calculate normality:
[tex]\text{Normality}=\frac{\text{Given mass of solute}\times 1000}{\text{Equivalent mass of solute}\times \text{Volume of solution (mL)}}[/tex] ....(1)
We are given:
Normality of solution = [tex]\frac{1}{20}=0.05N[/tex]
Given mass of solute = 0.56 g
Volume of solution = 250 mL
Putting values in equation 1, we get:
[tex]0.05=\frac{0.56\times 1000}{\text{Equivalent mass of solute}\times 250}\\\\\text{Equivalent mass of solute}=\frac{0.56\times 1000}{0.05\times 250}=44.8g/eq[/tex]
Equivalent weight of an acid is calculated by using the equation:
[tex]\text{Equivalent weight}=\frac{\text{Molar mass}}{\text{Basicity}}[/tex] .....(2)
Equivalent weight of acid = 44.8 g/eq
Basicity of an acid = 2 eq/mol
Putting values in equation 2, we get:
[tex]44.8g/eq=\frac{\text{Molar mass}}{2eq/mol}\\\\\text{Molar mass}=(44.8g/eq\times 2eq/mol)=89.6g/mol[/tex]
Hence, the molecular weight of the dibasic acid is 89.6 g/mol
determine the number of oxygen in 1.60 moles of sodium hydrogen phosphate
Answer:
6.40 is the answer to your question
The number of moles of oxygen in 1.60 moles of sodium hydrogen phosphate is 6.4 moles
Let's represent the chemical formula of the compound. The chemical formula of sodium hydrogen phosphate is as follows:
Chemical formula
The chemical formula of a compound is a symbolic expression use to signify the number of atoms present in a molecular substance. Therefore,
sodium hydrogen phosphate = Na₃PO₄
Therefore,
1 mole of Na₃PO₄ = 4 moles of oxygen
1.60 moles of Na₃PO₄ = ? moles of oxygen
cross multiply
number of moles of oxygen = 1.60 × 4
number of moles of oxygen = 6.4 moles
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SI units is an improved version of MKS system.
Answer:
the S.I unit
Explanation:
is the best unite
What kind of reactions are redox reactions
A reaction in which reduction and oxidation take place simultaneously known as a redox reaction.
