Answer:
23.33%
Explanation:
from
percent yield=(mass÷total mass )×100%
How would life be different if there were 10 hours in a day
Answer:
If there was only 10 hours in a day, including the night time it would be complexly new environment. Say you are up for 7 hours and sleep 3, in those 7 hours you would go to work for probably 4 hours, come home and do stuff for 3 then go to bed and do it all over again.
Displacement can be added to get the total
a) velocity
b) distance
c) speed
d) acceleration
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Ahhh helpppp:))))))))))
Answer:
HKOB
Explanation:
hope it helps
Na3(PO4) + HCl yields NaCl + H3(PO4)
Chemical Equation Balancer
Enzymes help the process of _digestion.
Answer: Yes they help you digest foods in your stomach
Explanation:
If you need a refresh of them: Enzymes create chemical reactions in the body. They actually speed up the rate of a chemical reaction to help support life. The enzymes in your body help to perform very important tasks. These include building muscle, destroying toxins, and breaking down food particles during digestion.
how many grams of solid silver nitrate would you need to prepare 200.0 mL of a 0.150 M AgNO3 solution
I WILL DIE I HAVE A KNIFE IN MY HAND. ANSWER WITH EXPLANATION. If the sound is high pitched, then the wave's frequency would have a:
A.high frequency, short wavelength
B. high frequency, long wavelength
C. low frequency, long wavelength
D. low frequency, short wavelength
Answer:
A
Explanation:
High frequency, short wavelength
A scientist thinks he found a new metal, so he published a paper about this metal. About 1 week after the scientist published the paper, you noticed a problem with the paper the scientist wrote. You noticed that this metal was not a new metal. In fact, this metal was discovered years ago. You determined this when you saw the atomic emission spectrum. As you read the article, you remembered that each atomic emission spectrum is unique to each element and the atomic emission spectrum matched one that was already discovered. Using the techniques from Chemistry, you ran a Flame Test with a piece of the metal (the metal is safe to use) that you had shipped to you. You found the metal turned the flame yellow. What metal did you have in your possession?
**ANSWER CHOICES**
*Barium
*Calcium
*Strontium
*Copper
*Sodium
Answer:
Sodium
because it burns with a yellow-orange flame.
Explanation:
It relates with Barium which burns with yellowish green flame
A science teacher asked students to calculate the density of a toy block. The mass of the block was 110 grams and the volume of the block was 8 cubic centimeters. What was the density of the toy block in cubic centimeters?
Answer:
13.75
Explanation:
Density is equal to mass divided by volume. 110/8 = 13.75
Which human activity can have the greatest positive effect on global climate change by helping to reduce the amount of carbon dioxide in the atmosphere
Answer:
C. Limiting internal combustion engines that power automobiles.
Explanation:
I majored in Chemistry
Which of the following may indicate that a chemical reaction has occurred?
a. release of energy as light
b. a color change
C. gas bubble formation
d. All of the above
Answer:
D, all of the above
Explanation:
A magnesium atom that loses 2 electrons becomes a
A) Positive ion with a smaller radius
B) Positive ion with a larger radius
C) Negative ion with a larger radius
D) Negative ion with a smaller radius
Answer:
A
Explanation:
because the atomic radius reduced by loosing one energy level leading to a positive ion in the resulting ion
The study of chemicals and their bond is called chemistry.
The correct answer is A.
The metals have the property to lose electrons to become stable compounds.
In magnesium, the total number of electrons is 12. In a valance shell, they have 2 electrons.
when they lose or donate the two electrons to the other. The outer shell will be empty and the force of the nucleus remains in the inner shell.
The loss of electrons leads to a decrease in the size of an atom and form positive ions.
Hence, the correct answer is A that is a Positive ion with a smaller radius.
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Use your knowledge of modern atomic theory and bonding to explain each of the following experimental observations. (Your explanations should be specific.) Refer to both substances when comparing. Within a family such as the alkaline earth metals, the ionic radius increases as the atomic number increases. The radius of the bromine atom is smaller than the radius of the bromide ion, Br-1. The first ionization energy of aluminum is lower than the first ionization energy of magnesium.
Answer:
(1) In the modern day periodic table the atomic size is increasing when we move down the group and it decreases when we move along the period from left to right. that's why Within a family such as the alkaline earth metals, the ionic radius increases as the atomic number increases. Alkaline earth metals have loosely held electrons which results in its increased size.
(2) The radius of the bromine atom is smaller than the radius of the bromide ion, Br-1 this happens because bromine is a non metal, and it also has a high electronegativity among other group elements as halogen group has high electronegativity. when the bromine acquires one extra electron and forms [tex]Br^-[/tex] ion, the configuration of bromine earlier was [tex]1s^22s^22p^63s^23p^64s^23d104p^5[/tex] but on addition of the electron the p shell will now have 6 electrons resulting in [tex]1s^22s^22p^63s^23p^64s^23d104p^6[/tex]the newly added electron repels the former neutral orientation and as a result of repulsion the size increases.
(3) The first ionization energy of Aluminum is lower than that of the first ionization energy of magnesium because magnesium has fully filled [tex]3s^2[/tex] orbital whereas Aluminum has one electron in the 3p orbitals, fully filled 3s orbitals has strongly held by the nucleus in case of Mg whereas 3p orbitals is shielded from the nucleus therefore it becomes easy to take out 3p electron that 3s electron.
which of the following compressed air?
a)car tyres be)Aerosol cans c)Air guns d)all of these
Answer:
option A.car tyres be
Explanation:
does anyone know the answer to this riddle???
Answer:
babe where are u???????!
Explanation:
babe plz text me im lowkey freaking out rn
Which of the following does NOT
have large coal deposits?
Answer:
Mexico
Explanation:
The top five countries with the largest proven coal reserves
United States – 249 billion tonnesRussia – 162 billion tonnesAustralia – 149 billion tonnesChina – 142 billion tonnesIndia – 106 billion tonnes.Mexico isn't on this list
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PLEASE HELP ASAP
Which two reactions are slower than the others?
A. Silver tarnishes in air that contains hydrogen sulfide.
B. Lead nitrate and potassium iodide react to form a yellow
precipitate.
C. Black powder in fireworks burns explosively to produce white
light
D. Iron metal reacts with oxygen in air to form rust.
Answer:
A and D takes much slower
Explanation:
Here, we want to select, out of the four given reactions, the one that is slower than the other two
The answers in these case are reactions 1 and 4 ( A and D)
The two reactions show what is called rust (as directly seen in reaction 4)
When we speak of rust, we simply mean a reaction that occurs over time
For example, non coated roofings of houses doesn’t get to change color at an instant
The color degradation that occurs is something that takes some time from the initial time they were used to roof the house
Hence, from these analogy, we can see that these reactions need an an external support to thrive or to come into existence
These external supports are natural forces and they contributing efforts occur over time and cannot be seen immediately
These reactions are thus ones that take much slower time than conventional laboratory reactions in the case of the formation of the precipitate or a reaction that requires a low flash point temperature such as that of black powder to produce such explosive effects
So in conclusion, what we are saying is that the two selected reactions are subjected to the availability of some conditions and may take time to manifest and these absolutely differentiates them from reactions that are spontaneous such as the one having an explosive effect or the other one leading to the formation of a precipitate which takes far less times
7. Base your answer to the following question on the information below and on your knowledge of biology A student designed an experiment to investigate a claim that athletes would have lower heart rates than nonathletes during exercise. After the students classified themselves as an athlete or a nonathlete, their resting pulses were determined. Then all the students performed the same exercise for four minutes and their heart rates were determined by recording the pulse rate in beats per minute. The students continued to measure their pulse rates for an additional four minutes. The average heart rate per minute for each group was determined. The data were recorded, as shown on the table below Average Heart Rate Response to Exercise (beats per minute) Time (minutes) Athlete Students Nonathlete Students Resting Pulse 68 72 1 76 78 2 82 90 Exercising Period 3 115 95 110 4 130 5 100 125 6 95 120 After Exercise 7 85 100 8 68 95 2.4 To improve the validity of the conclusion reached in this experiment, the students should repeat the experiment A) disregarding any data that don't fit the hypothesis B) with a larger number of athletes and nonathletes C) comparing the heart rates and breathing rates of males and females D) with the athletes doing different exercises than the nonathletes
What is the bond order for a single covalent bond?
Answer:
We typically represent covalent bonds with a dash ( - ) between the atoms. This indicates a single bond. Ex: Cl - Cl
Single bond, double bond, triple bond.
Explanation:
We call it a single covalent bond because the atoms are sharing a single pair of electrons.
Answer: If you have this question: The bond order for a single covalent bond is ____.
Then the answer is oneExplanation:
first to answer correctly gets brainleist
Which lunar phase will occur approximately 7 days after a first quarter moon?
a
New moon
b
Full moon
c
Waxing crescent
d
Waning crescent
Answer:
c. Waxing crescent
- I hope this helps have a great night
Which of these are an atom's valence electrons?
Answer:
The Outer-most Electron shell contains the valence electrons.
Bonus Info:
Valence Electrons are used by atoms to make ionic bonds.
Answer:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.
Explanation:
ur welcome
i was doing this in school and i watched a video
Is honors high school chemistry hard? Is it hard mathematically? please answer ASAP i have to put in my courses for next year.
Explanation:
yes its hard if you don't pay attention.
Yes, the math is harder but chemistry is not it's really fun the math does get harder tho.
Which substance in this redox reaction is the oxidizing agent?
Which of the following metals is
obtained from its ore by heating?
A Aluminium
B. Calcium
C Iron
D. Lead
F Mercury please heeeeeeelp
Answer:
c. iron I hope it helped.....
Answer:
I think soon mercury ..........
The Guarantee Clause gives the legislature the power to make all necessary and proper laws.
Answer:
True
Explanation:
Answer:
True ;)
Explanation:
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Answer:
Nice! If only....
Explanation:
Answer:
omg lol what even is this
What causes these H-bonds to form?
Answer: It is caused by the tendency of some atoms in molecules to attract electrons more than their accompanying atom.
Help needed: Which of the following is the correct name for N2S5?
A. Dinitrogen sulfide
B. Dinitride pentasulfur
C. Dinitrogen pentasulfide
D. Nitrogen sulfide
Answer:
dinitrogen pentasulfide
Explanation:
The correct name for the compound N₂S₅ is Dinitrogen pentasulfide and the correct option is option C.
Naming of compounds refers to the systematic process of assigning names to chemical compounds based on their composition and structure. It involves following certain rules and conventions to generate appropriate names that accurately represent the chemical formula and characteristics of the compound.
In inorganic chemistry, naming compounds often involves identifying the elements present and specifying their respective oxidation states or charges. Various naming conventions, such as the Stock system and the common system, are used depending on the type of compound and the specific elements involved.
Thus, the ideal selection is option C.
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In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium sulfide?
A. one
B. two
C. three
D. four
E. none
Also, state why.
There are none
Further explanationGiven
a molecule of calcium sulfide
two valence electron of Calcium(Ca)
six valence electrons of Sulfur(S)
Required
number of lone pairs of electrons
Solution
Lewis structure shows the form of bonds that occur in the valence electrons of an element or compound
Valence electrons are electrons used in a chemical bond
To achieve stability, the element S needs 2 more electrons which are obtained from 2 electrons from the Ca element,
A lone pair electron means refers to an unshared pair of electrons(not bonding to the other atoms)
This condition usually occurs in covalent bonds
As we know, the bond between Ca, which is a group 2 (metal) with Sulfur in group 16, is an ionic bond because it occurs between metal and non-metal ions, so there is no sharing of electrons, but there is a release of electrons from Ca ions to S ions to form an octet. , so all the valence electrons in S are paired