Answer:
B. hydrogen bonding
Explanation:
Waxy surfaces are non-polar while also water is polar. There is a difference in electronegativity between the atoms O and H, in which O is more electronegative than H. Such a difference in electronegativity causes the two covalent O-H bonds to become polar in water, where O atom has a partial negative charge, and the H atom has a partial positive charge.
Therefore from the above explanation the correct answer is B
What are the lines around the nucleus called?
Answer:
am can u pliz tell me more about ur qtn
Explanation:
like a nuclear of a what
maybe a plant or and animal
Answer:
Orbiting electrons
Explanation:
Which reaction is exothermic? CH4 + 2O2 Right arrow. CO2 + 2H2O + 891 kJ NH4NO3 + H2O + 25 kJ Right arrow. NH4+(aq) + NO3-(aq) 2H2O + 286 kJ Right arrow. 2H2 + O2 N2 + O2 + 181 kJ Right arrow. 2NO
Answer:
ch4 + 2o2 gives co2+2h2o +891kj
Explanation:
becoz 891kj heat energy is given out
exothermic process means heat energy is given out/ released
Among the given reactions the exothermic reaction is option a. The reaction between methane and oxygen giving out carbon dioxide and water with 891 KJ of heat energy.
What is exothermic reaction?An exothermic reaction is the reaction in which heat is evolved from the reaction system to the surroundings. The reaction container will be too hot to touch.
The enthalpy change for an exothermic reaction is negative. Whereas that for an endothermic reaction is positive where, heat is absorbed into the reaction system.
For the given reactions, all other reactions except option a are intaking some heat energy that's why written in the left side of arrow which are endothermic. Option a is the combustion of methane gas and it is exothermic.
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what do you mean by fractional column?
Answer:
Fractional column is an essential item used in distillation of liquid mixtures so as to seperate the mixture into its component parts, or fractions based on the differences in volatilities.
Explanation:
How many protons, electrons, and neutrons does the following isotope contain?
Answer:
Explanation:
An atom is composed of a nucleus and electrons orbiting around it,and the nucleus itself contains protons and neutrons (with the exception of protium, an isotope of hydrogen with only a proton in the nucleus) because each element contains a specific and unique number of protons, but the number of neutrons can vary,an element, therefore, can have several variants, called isotopes, which differ slightly in the composition of the nucleus,the number of electrons can also change in an atom, giving us positive or negative ions.
=Br-79 has 79 nucleons. 79 protons and neutrons. We know that bromine has 35 protons, and 35 electrons, so all we need to do is subtract. 79 nucleons - 35 protons = 44 neutrons,
Subtract the atomic number from the mass number,the result gives you the number of neutrons in the isotope,look to see if the isotope has a charge, denoted by a superscript number and a plus or minus sign next to it,subtract the charge from the atomic number if the charge is positive,the result is the number of electrons in the isotope,add the absolute value of the charge to the atomic number if the charge is negative,the result is the number of electrons in the isotope.
= 35 from 79 and you will get 44. 44 is the number of neutrons in the Br-79 isotope.
79-Br+, that means:
It’s still a Br (bromine) atom, so it doesn’t change the number of protons //because changing the number of protons, it won’t be bromine anymore//
So bromine atom has 35 protons
So, isotope means many forms of atoms with the same element, which are different from atomic mass (or more clearly, the number of neutrons) → 79 (this number is shown for the atomic mass) - 35 = 44 neutrons
It has 35 protons, 34 electrons and 44 neutrons. The way to figure this out is - the protons of an element never change. So when you say bromine, you look it up on the Periodic table and you see its atomic number (aka # of protons) is 35. It will always be 35 for bromine. Then you take the charge into account. In this case, the charge is +1. Since protons can’t change, electrons must. One more proton equals one less electron. So 34 electrons. The atomic weight of a number (79 in this case) is = # of protons + # of neutrons. So neutrons = 79 - 35 = 44.
Hope this helps!
A chemist wants to examine specific chemical reactions and isolate certain products using a controlled experiment. How would the chemist perform this experiment?
Answer:
in a laboratory
Explanation:
A controlled experiment refers to the one where everything is an experiment except a single variable is held constant. A collection of information is typically taken as a control group, which is generally the ordinary state, and another group is analyzed( such as chemical reaction as per the question) in which all conditions are similar to the control group except for the variable under examination. The main benefit of a controlled experiment is that confusion over the accuracy of the results can be eliminated more easily.
where did the mass of the forest tress come from? What happen to that mass when the forest burns?
Answer:
The mass of the forest comes from carbon and carbon is retrieved from carbon-dioxide that trees used during the process of photosynthesis. In the process of photosynthesis, carbon-dioxide is utilised from the atmosphere by trees and release oxygen and ATP.
When the forest burns the mass again releases to atmosphere in the form of carbon which causes air pollution and increases carbon content in the atmosphere.
Question 9
9. A substance has no definite shape or form.
True
False
Answer:
it us false
Explanation:
air and gas don`t have definite shape
but solid have all definite
A snail can crawl 160 cm at an average speed of 4cm/min. if it crawled at an average speed of 5 cm/min instead , how much sooner would it take to reach the destination ?
when The appearance of a system changes does the mass of the system also change why why not
Your question has been heard loud and clear.
Well , if youre talking about chemistry , then yes youre right , Appearance and mass are totally different concepts , appearance of any substance only depends on how the surfaces absorb and relfect light. Mass , well it is constant for a system and will never change , appearance of a system may change but not because of mass.
Thank you
A galaxy is a system of celestial bodies, such as stars, planets, several solar systems, and interstellar gas and dust. Our solar system is a part of a galaxy called
Answer:
The Milky Way
Explanation:
Answer:
The Milky Way
Explanation:
what is the mass of carbon dioxide which contain the same number of molecules as are contained in 14 gram of oxygen?
Answer:
Mass of CO2 WILL BE ~ 9.33 g
Explanation:
Moles of O2 = 14/18
Let the mass of CO2 be x
Then moles of CO2 will be = x/12
moles of CO2 = moles of O2
x/12 = 14/16
x = 9.33 grams
9. What lab equipment is used to spread heat when heating to prevent glassware from cracking
breaking?
When a scientist uses reasoning to explain or interpret the things they observe
Answer:
Inferring is when a scientist uses reasoning to explain or interpret the things they observe
what do you understand by Gas oline
Answer:
It is petroleum-derived product comprising a mixture of liquid aliphatic and aromatic hydrocarbons, ranging between C4 and C12 carbon atoms with the boiling range of 30–225°C
Explanation:
Gasoline is a mixture of paraffins, naphthenes, aromatics and olefins.
Which term describes the process of making an economic decision by considering both the advantage and the problems that might arise from the decision
Answer:Cost benefit analysis
Explanation:
Production, distribution, exchange, consumption, saving, and investment of economic resources are all a part of economic decisions. Public and private objectives. Economic choices are made in order to further the interests of both the general public and private persons and organizations (public goals).
The purchase of a device at a specific price is a straightforward illustration of an individual economic decision. This person will have to decide whether it is worthwhile to use his or her limited financial resources to purchase a device. A family's financial decision is virtually analogous, except that it involves more people this time.
The laws of supply and demand are used in the marketplace to guide economic decisions. The term describes the process of making an economic decision as a cost-benefit analysis.
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1. Review the information in the table below. Use the information to calculate rate of how many sandwiches are made in a 10-minute period. The first calculation has been done for you.
Answer:
The answer to your question is given below.
Explanation:
Rate is simply defined as quantity per unit time. Mathematically it is represented as:
Rate = Quantity /time
Thus, we can obtain the rate as follow:
1. Quantity = 20 sandwich
Time = 10 mins
Rate =?
Rate = Quantity /time
Rate = 20/10
Rate = 2 sandwich per mins
2. Quantity = 30 sandwich
Time = 10 mins
Rate =?
Rate = Quantity /time
Rate = 30/10
Rate = 3 sandwich per mins
3. Quantity = 40 sandwich
Time = 10 mins
Rate =?
Rate = Quantity /time
Rate = 40/10
Rate = 4 sandwich per mins
4. Quantity = 50 sandwich
Time = 10 mins
Rate =?
Rate = Quantity /time
Rate = 50/10
Rate = 5 sandwich per mins
Thus, the complete table is given as follow:
Quantity >> Unit of measure >> Rate
10 >>>>>>> 10 min >>>>>>>>>> 1
20 >>>>>>> 10 min >>>>>>>>>> 2
30 >>>>>>> 10 min >>>>>>>>>> 3
40 >>>>>>> 10 min >>>>>>>>>> 4
50 >>>>>>> 10 min >>>>>>>>>> 5
About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter
Which step should be next in this procedure? List the materials that are needed. Write a conclusion for the experiment. Write a hypothesis for the results. Draw a table for the observations.
Question 3 (1 point)
There are 4 slices of pepperoni pizza, 1 slice of sausage pizza, and 3
slices of cheese pizza left. Without looking, Mr. Sanchez took his first
slice of pizza, ate it, and then took another slice. What is the
probability of getting the first slice pepperoni and the second cheese.
Answer make sure yu read bk the answer is in the question
Explanation:
Answer:
4/8 for pepperoni and 3/8 for cheese
Explanation:
Try these!
the atomic mass of the element cobalt is 58.933 atomic mass units. if a scientist measures the mass at 57.514 atomic mass units, what is the percent error?
Answer:
The percentage error is -2.4 %
Explanation:
The percentage error is calculated by the following formula;
[tex]Percentage \ error = \dfrac{Approximate - Exact }{Exact}[/tex]
The given parameters are;
The atomic mass of cobalt = 58.933 amu. = The exact value
The mass of cobalt as measured by the scientist = 57.514 = The approximate value
Therefore, the percentage error is given plugging in the values into the above equation for percentage error as follows;
[tex]Percentage \ error = \dfrac{(57.514- 58.933 )}{58.933 } \times 100 = -2.41\%[/tex]
The percentage error = -2.4 %.
Mendeleev's arrangement of elements in the periodic table was based on the observations and experiments of his predecessors who studied the mass and properties of elements. (2 points) True False
Answer: True
Explanation:
Mendeleevs periodic classification is based on the atomic masses of the elements.
Air has a mass of 1.2g and a volume of 4,555ml. What is the density
Answer:
Hey there!
Density=Mass/Volume
Density=1.2/4555
Density=2.63e-4g/cm^3
Let me know if this helps :)
The symbol of the element with atomic number 114.
Answer: Fl
Explanation:
If you go onto the periodic table, you find the element that has the atomic number 114. It is located in period 7 and Group 14.
Answer:
[tex]\huge \boxed{\mathrm{Fl}}[/tex]
Explanation:
In the periodic table, the element with an atomic number of [tex]\sf 114[/tex] is Flerovium.
The symbol for the element Flerovium is [tex]\sf Fl[/tex] .
Why are there so many substances?
Answer:
first conclusion was that the whole world is made up of only 4 elements but as the time passed more elements were discovered... if the world would not contain more elements... you wouldn't be alive.
Which of the following statements most likely
explains why Einstein thought forming a problem
is more important than solving it?
It is harder to think of a problem to solve than
to solve the actual problem.
Forming a problem requires the scientist to
use creativity to imagine new solutions.
It is hard to think of new questions to answer
because so many have already been
answered.
Scientists who are not imaginative are not
very good problem solvers.
Answer:
Forming a problem requires the scientist to use creativity to imagine new solutions.
Explanation:
Albert Einstein remains a critically prominent figure who conducted remarkable, ground-breaking research that not only formed the foundations of modern physics but also strongly affected the scientific world. It is difficult to teach imagination but it can be harnessed and accepted. Nothing incites our imaginative impulses we love more than the prospect of immediate creative inspiration. And creativity hits its full potential when paired with the experience, insights, and skills people gained by questioning the real-life problems.
Answer:
Your answer would be B, forming a problem requires the scientist to use creativity to imagine new solutions.
Explanation:
Got it right on Edge 2020. Hope this helps you!
A car is traveling at 88 ft/sec. What is the car's speed in miles/hour?
write the IUPAC name the following
Answer:
1. Chloro(methylchloranuidyl)methane
2. 1-Chloro-3,3-dimethylbutane
3. 2-bromobutane
What is the ph of 0.00035 M KOH
Answer:
13.5
Explanation:
Potassium hydroxide fully ionizes when dissolved in water according to the following equation:
K
O
H
→
K
+
+
O
H
−
Now, let's find the relationship between
K
O
H
and
O
H
−
1
:
1
ratio
⇒
[
K
O
H
]
=
[
O
H
−
]
=
6.7
×
10
−
3
M
In any aqueous solution,
[
H
3
O
+
]
and
[
O
H
−
]
must satisfy the following condition:
[
H
3
O
+
]
[
O
H
−
]
=
K
w
[
H
3
O
+
]
=
K
w
[
O
H
−
]
[
H
3
O
+
]
=
1.0
×
10
−
14
6.7
×
10
−
3
[
H
3
O
+
]
=
1.5
×
10
−
12
M
Now, after finding the concentration of the hydronium ion, the pH of the solution is determined:
p
H
=
−
log
[
H
3
O
+
]
p
H
=
−
log
[
1.5
×
10
−
12
]
p
H
=
11.83
Other Method
Find the pOH using the concentration of the hydroxide ion, then use the formula
p
H
+
P
O
H
=
14
to find the pH.
The -Hasselbalch equation may be used to get the pH of 0.00035 M KOH.
What is the way for calculating the pH ?According to this formula, the pH of a solution is determined by adding the pKa of the acid and the logarithm of the base to acid ratio. KOH has a pKa of 14.0.
Therefore, the following formula can be used to determine the pH of the 0.00035 M KOH solution: pH = 14.0 + log (0.00035/1) pH = 14.0 - 3.46 As a result, the pH of the KOH solution at 0.00035 M is 10.54. Since KOH is a strong base, it completely dissociates in water, forming a solution that is made up of K+ and OH- ions.
Water reacts with hydroxide ions to make hydronium ions (H3O+), which are created when a strong base is introduced. The amount of hydronium ions in the solution rises as a result of this reaction, which lowers the pH of the liquid.
A KOH solution with a pH of 0.00035 M has a value of 10.54, which is higher than the pH of pure water (7.0). This is because when KOH dissociates in water, hydronium ions are produced. A solution's acidity or alkalinity can be determined using the pH of a 0.00035 M KOH solution.
A solution's pH is measured between 0 and 7, with 7 being neutral or alkaline and 0 being acidic. Since 0.00035 M KOH has a pH of 10.54, which is higher than 7, the solution is either basic or alkaline.
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HeLp ASAP pls need it rn
Answer:
I'm pretty sure is a mixture
Which bond is intermediate in terms of strength? why is it weaker than the strongest? ap bio?
Answer:
Ionic bond is the intermediate in strength.
Explanation:
Ionic bond is weaker than covalent bond and stronger than hydrogen bond in strength because in ionic bond, the atoms attract each other due to opposite in charge. Ionic bond is a type of bond in which one atom losses electron completely and become cation (positive charge) while the other atom receive the electron and become anion (negative charge). so they attract each other due to opposite charges.