4) Type only the NUMBER answer to the question below (no units). Your
answer should have 4 significant figures.
How many grams of N202 are present in 4.5 x 1024 molecules of N2O2
[tex]10 {}^{ - 16} M \: HCL \text{ \: is \: divided \: to \: 100 \: times \: its \: pH \: will \: be}[/tex]
Please Help me with this
25 Points_
[tex] \text{Given, Concentration of HCl}= 10 {}^{ - 6} M[/tex]
[tex] \text{After Dilution conc. of HCl =} \frac{10 {}^{ - 6} }{100} = {10}^{ - 8}M [/tex]
[tex] \therefore \text{pH = - log[H}^{ + } ][/tex]
[tex] \therefore \text{ pH }= - \log [{} {10}^{ - 8}] = 8[/tex]
[tex] \text{But} \: \text{This} \: \text{Is} \: \text{Not True Because} \\ \text{ An Acidic Solution Cannot have} \text{pH Greater than 7.} \\ \text{ In this case} [ {H}^{ + } ] \text{ Ions Of Water Molecule} \\ \: \text {Cannot Be Neglected.}[/tex]
Thus,[tex] {[H}^{ + } ] = {[H}^{ + } ] _{HCl} +{ [H + }^{ } ] _{H_2 O}[/tex]
As we know, ionic product[tex][H {}^{ + } ][OH {}^{ - } ] = 10 {}^{ - 14} \\ [H {}^{ + } ] = {10}^{ - 7} \\ [H {}^{ + } ] \text{total} = {10}^{ - 8} + {10}^{ - 7} \\ = {10}^{ - 8} (1 + 10) \\ = 11 \times {10}^{ - 8} [/tex]
[tex] \text{Now from, pH} = - \text{log}[H {}^{ + } ] \\ = \text{ - log}(11 \times {10}^{ - 8} ) \\ = - \text{ log}11 - \text{ log} {10}^{ - 8} \\ = 6.957[/tex]
Hope This Helps!!Which metal in the fourth period is the least reactive? Explain your reasoning
Answer:
Krypton
Explanation:
It is a noble gas, so it isn't reactive since it already has 8 valence electrons.
i have a question so im working on a hydrology crossword puzzle and it says how acidic or basic a substance is and it only has 9 letters and its starts with p and the 3rd letter is b i need help
Answer: " PHBALANCE " .
_____________________
Explanation:
_____________________
The pH scale is logarithmic and indicates how acid or how basic a substance is.
ph balance ; as one word in a crossword puzzle,
with 9 letters ; P-H-B-A-L-A-N-C-E ; amounts to exactly 9 (nine) letters ;
And starts with a "P" ;
the 3rd letter is "B" .
_____________________
Source: Self-perception and tuition.
Hope this helps! Please let me know if the answer is correct; or if it makes sense!
_____________________
Please help!!
Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars. Which type of organic compound does the train most closely model?
A. an alkyl halide
B. an aldehyde
C. an ether
D. a carboxylic acid
Answer:
C. an ether
Explanation:
A compound containing only carbon and hydrogen is found to contain 80.0% carbon. It has a molecular weight of 30.0. What is its molecular formula
Answer:
(80.0, 20.0) The statement states that 80% of the compound is carbon. To acheive the amount of carbon in a 100 g sample, you need to multiply the weight of the sample by the percentage of carbon in the compound. Recall that 80%=80/100=.8 .8*100g=80g of carbon. The same process goes for the hydrogen. .2*100g=20g hydrogen. Explanation:
1.Which of these statements about the
conservation of mass is not correct?
A.The mass of the products will be equal to the
mass of the reactants.
B.During a chemical reaction, no mass is
created or destroyed.
C.There will be the same number and type of
atoms before and after a chemical reaction.
D.All of the above are correct.
what is a substance that doesn't dissole in water
Answer:
insoluble substances
Explanation:
How do we think that Mars lost atmospheric gas?
What basic planetary property would have had to be different for Mars to retain a thicker atmosphere?
the rocky planet was exposed to harsh and forceful solar winds, which blew the Martian atmosphere away.
Another option for thickening the atmosphere of Mars, and, in turn, raising the temperature of the planet, would be to set up solar-powered, greenhouse-gas producing factories.
How many atoms are in 1.14 mol of SO2?
2.05 x 10 ^24
Sofia is doing a presentation on the history of blood analysis. Who is she MOST likely to mention in her presentation?
A. Karl Landsteiner
B. Sir Edward Henry
C. Cora Crippen
D. Trenton Luminol
Answer:
A. Karl Landsteiner is the most likely for her to mention.
HELP PLEASE!!!!!! I will give 100 points!!!!!
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of H2SO4 can be made when 87 moles of HNO3 are consumed?
Answer:
what do you need help with .
Explanation:
?
Answer:
Based on stoichiometry HNO3 to H2O is 6:2
Use 9 grams to find the moles of HNO3
9 grams/63g/mol=0.143 moles of HNO3
HNO3:H2O
6:2
0.143*2/6=0.048
H2O moles is 0.048moles
Mass of water =0.048moles*18g/mol=0.864g
To the nearest tenth=0.9grams
( sorry if its not right)
Dispersed colloids systems have the same _________________ (on the particles) which keep the particles dispersed.
Answer:
The dispersed particles of lyophobic colloidal systems have the same kind of electric charge. Particles with like charge repel each other and their mutual repulsion prevents them from joining together and settling out. The accumulation of similar kind of charges on the suspended particles holds them part and thus stabilizes the system.
Explanation:
1. Which location (a, b, or c) would have the highest temperature?
2. Which location(a, b, or c) would have the lowest temperature?
3. Give reasoning to explain how and why the latitude of a place on Earth affects its average temperature.
WORTH 100 POINTS! WILL MARK BRIANLESIT
Answer:
1. B
2.C
3.The further out and the closer the the equator a place on Earth is the warmer it is due to the fact that the sun directly hits countries on the equator and takes in heat faster then the north and south pole. Countries on more of a curve are colder due to the fact they are more curved and it is harder for the heat to be taken in at a curve.
B is center point line passing through earth and it's placed right infront of sun so b would have highest temperature
#2
A and C both are poles so at a and c least sun light can reach hence lowest temperature.
#3
As far as the latitude is placed from equator lower the temperatureAs near as the latitude is located from equator higher the temperatureWhat is the density of a cube that has a mass of 25 grams and a volume of 125 cm3
To convert it in Kg/m³ divide by 1000 and multiple with 10⁶
[tex]Density = 0.2 \: \times \frac {{10}^{6} }{10 {}^{3} } = 0.2 \times {10}^{3} \\ Density = 200 \: kg \: m {}^{ - 3} [/tex]
Select the correct answer. A mixture consists of glucose and water. What is the percent composition of glucose in the mixture if it contains 1. 3 moles of glucose (C6H12O6) and the total mass of the mixture is 276 grams? A. 17. 7% B. 26% C. 35% D. 77% E. 85%.
Answer:
The percent composition of glucose in the mixture is 85 % (Answer E)
Explanation:
"percent composition of glucose = (mass of glucose / mass of the mixture) x 100
Step 1: calculate the mass of glucose ( C6H12O6)
mass of glucose = moles of glucose x molar mass of glucose
molar mass of C6H12O6 = [( 12 x6) + ( 1 x12) + ( 16 x6)= 180 g/mol
mass is therefore= 1.3 moles x 180g/mol = 234 grams
Step 2: calculate the percent composition
= mass of glucose /mass of mixture x 100
= 234 g/276 g x 100 = 85 %(answer E)"
Answer: the answer is E
Explanation: plato users
1.A space shuttle's wings are useless as it travels around the exosphere. Explain, in your own words, why the wings are so useless and how the shuttles can move around.
2.Explain, in your own words, the thermosphere and the stratosphere are our hottest atmosphere layers.
3.Explain, in your own words, how and why “shooting stars” occur. For example, why and what causes meteors to burn up.
4.Explain, in your own words, the importance of our ozone layer in the stratosphere.
5.Explain, in your own words, why weather only occurs in the troposphere.
PLEASE HELP!!!!! Use your own words please! I will give the brainiest to the person who answers it!
Thrust acts on the spacecraft and propels in the space.
How space shuttles move?1. The force created by the shuttle's engines in expelling the burning fuel produces an equal thrust in the opposite direction. This thrust acts on the spacecraft and propels in the space.
2. The thermosphere and the stratosphere are our hottest atmosphere layers because these two layers are present near the sun as compared to other layers of atmosphere.
3. When the meteors hit the atmosphere, meteors rub against air particles and create friction which is heating the meteors. The heat vaporizes most meteors, creating what we call shooting stars.
Learn more about atmosphere here: https://brainly.com/question/24925283
2. When protein is digested by the body, what molecule do they become?
Answer:
Amino acid
Explanation:
When you eat food the body's digestive system breaks down the protein into the individual amino acids, which are absorbed and used by cells to build other proteins and a few other macromolecules, such as DNA
The ph of water is approximately 7 which means it is:.
Answer: Neutral
Explanation: This is because, in the ph scale, greater than 7 indicates base or alkaline (basic), while less than 7 indicates that it is acidic.
Please help me I just need the answers please no need for the explanation
Answer:
C = q / m x dT
Explanation:
By definition, specific heat, C = heat absorbed, q divided by mass, m and change in temperature, dT
So C = q / m x dT
Answer:
The specific heat capacity of a material is the energy required to raise one kilogram (kg) of the material by one degree Celsius (°C)
Formula:
energy (J) = mass (kg) * specific heat capacity (J/kg°C ) * change in temperature
required answer:
C = q / m * dTusing the formula:
C = [tex]\frac{102}{12.5*(55-22)}[/tex]
C = 0.2473 J/kg°C
↑
This is the specific heat capacity of copper
Question 1 (1 point)
Mackenzie adds sodium chloride and sucrose to water. Identify the solutes.
a
sodium chloride
b
water
с
sodium chloride and sucrose
d
sucrose
The solute in this case would be sodium chloride and sucrose.
SolutesSolutes are substances capable of dissolving in solvents to give homogenous mixtures known as solutions.
In this case, both sodium chloride and sucrose were added to water - water is acting as the solvent.
Sodium chloride is soluble in water and so also is sucrose.
Thus, a homogenous mixture of sodium chloride and sucrose would result.
More on solutes can be found here: https://brainly.com/question/7932885
If you have 1 mole of methane gas, how many liters of methane gas do you have?
I have 22.4 litre of methane gas
What could happen to nearby molecules if one side of a molecule has a temporary negative charge?
Answer:
The London dispersion force is a temporary attractive force that results when the electrons in two nearby atoms of two different molecules occupy positions that make the atoms form temporary dipoles (positive or negative charge).
Explanation:
Question 1 of 10
What does the pH of a solution represent?
A. The pH indicates how acidic or basic a solution is.
B. The pH represents the partial pressure of hydrogen gas.
C. The pH is an indicator of the salt content of a solution.
D. The pH tells how quickly a reaction reaches equilibrium.
At room temperature most elements are classified as.
I am assuming you are talking about their phase and in that case, they are mostly solid except for mercury and bromine.
Hope that helps!
SOMEONE HELP ME PLEASE
( multi choice) ( science)
What are the ways that oxygen enters our body?
A. nose
B. mouth
C. ears
D. eyes
Answer:
you can also get oxygen from the mouth but you get more from the nose so i would chose nose
How do plants affect the amount of carbon in Earth’s atmosphere?
Question 1 options:
Plants increase the levels of carbon dioxide in the atmosphere due to the process of photosynthesis.
Plants have no effect on the amount of carbon in the atmosphere
Plants decrease the levels of carbon dioxide in the atmosphere due to the process of photosynthesis.
Answer:
c
Explanation:
plants decrease the levels of carbon dioxide in the atmosphere due to the process of photosynthesis
Antibiotics are drugs used to kill bacteria. Some bacteria develop mutations that make them resistant to
antibiotics.
Which of the following BEST explains this mutation with respect to bacteria?
The mutation is a harmful mutation since many bacteria will be killed by antibiotics
The mutation has no effect since the bacteria cannot be targeted by an antibiotic.
The mutation is a helpful mutation since it helps bacteria to survive and reproduce.
The mutation is a helpful mutation since humans can survive longer.
The mutation is a helpful mutation since it helps bacteria to survive and reproduce.
What makes a person scientifically literate? In three to five sentences, explain your answer.
It means that a person has the ability to describe, explain, and predict natural phenomena. Scientific literacy entails being able to read with understanding articles about science in the popular press and to engage in social conversation about the validity of the conclusions. Scientific literacy implies that a person can identify scientific issues underlying national and local decisions and express positions that are scientifically and technologically informed. A literate citizen should be able to evaluate the quality of scientific information on the basis of its source and the methods used to generate it. Scientific literacy also implies the capacity to pose and evaluate arguments based on evidence and to apply conclusions from such arguments appropriately.
hope this helps and sorry if this is wrong