Answer:
First Choice
it produces offspring with a large amount of genetic variation
Answer: i think this is correct.
Explanation: it occurs in simple organisms, such as bacteria, but not in multicellular organism such as plants and animals
1 mole of hydrochloric acid reacts with 1 mole of sodium hydroxide to give _______ g of sodium chloride.
Answer:
58,5
Explanation:
The rate of gas diffusion is ---Select--- proportional to temperature because a higher temperature means a/an increase in the kinetic energy of molecules. The rate of gas diffusion is ---Select--- proportional to the molecular weight of the gas because gas particles with higher masses require ---Select--- energy to move compared to gas particles with lower masses.
Answer:
The rate of gas diffusion is directly proportional to temperature
Explanation:
The rate of gas diffusion is
a) directly proportional to square root of temperature
b) inversely proportional to the square root of density
c) directly proportional to pressure
d) inversely proportional time and square root of molecular mass
Thus, option A is correct
Is this an alpha or beta decay?
The half-life of iodine-131 is 8 days. How many milligrams of iodine-131
remain after 24 days if the original amount was 4.00 mg?
A. 1.33 mg
B. 0.667 mg
C. 0.500 mg
D. 0.444 mg
Answer:
The correct answer is - C. 0.500 mg.
Explanation:
In this case, the half-life of the iodine-131 is 8 days and the initial amount is given 4 mg. According to this after every 8 days, half of the initial value of the iodine-131 remains only.
8 days or 1st half-life = A(i)* 1/2
16 days or two half-life = A(i)* 1/4
24 days or three half-life = A(i)* 1/8
and the remaining amount A would be
= A(i)*1/2^n
= 4 * 1/2^3
= 4 *1/8
= 0.500 mg
What volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide, all bromide ions in 35.0 mL of 0.064M of calcium bromide?
2AgNO3(aq) + CaBr2(aq) → 2AgBr(s) + Ca(NO3)2(aq)
a
3.04 mL
b
10.8 mL
c
21.6 mL
d
43.2 mL
Answer:
im pretty sure its d
Explanation:
The volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
What is Molarity ?
Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l .
[tex]\rm M=\dfrac{n}{V}[/tex]
where n is the number of moles
and V is the volume in litres.
We can rearrange this equation to get the number of moles:
n= M * V
The molarity of calcium bromide is 0.064 M and the volume given is 35 ml,
the moles will be n = 0.064 * 35 = 2.24 moles
2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)
From the reaction we can see that for every 1 mole of Calcium Bromide 2 moles of Silver Nitrate is needed , so for 2.24 moles 4.48 moles will be needed.
The molarity is given as 0.415 M and the number of moles is 4.48 so the volume required can be calculated from the above formula
[tex]\rm V=\rm\dfrac{n}{M} \\\\V=\rm\dfrac{4.48}{0.415} \\\\V= 10.8 ml\\[/tex]
Hence the volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
To know more about Molarity
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How many joules of heat is needed to heat 68.00 grams of aluminum foil from 55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C? 2871 J 9058 J 2326 J 3420 J
Answer:
2326 J
Explanation:
93-55
You get the temperature increased.
Then the answer (x)
Mass *(x) *specific heat
LINO3 +
CaBr2 → ____ Ca(NO3)2 +
LiBr
Answer:
2LiNO3 + CaBr2 → Ca(NO3)2 + 2LiBr (balanced equation)
Answer:
2LiNO3 + CaBr2 → Ca(NO3)2 + 2LiBr
Explanation:
in which statement are the particles close together and slowly moving past each other
Answer
A-air
B-ice
C-steam
D-water
Answer:
Water particles are close together and move slowly past each other
if 22.1g of CH4 reacts with 31.9g of O2 what is the limiting reactant?
timed test! will mark brainliest please help!!!
Answer:
CH4
Explanation:
because it CH4 have lesa mass than that of O2
Guys pls HELP ME PLS I WOLL GIVE BRAINLIEST PLS
What is the volume of NaOH used in each Titration??
Answer:
Titration 1=33.9ml
Titration 2=33.45ml
Titration 3=33.35ml
Explanation:
Volume of NaOH used =Final reading - Initial reading
Titration 1:
Final reading =35.5ml
Initial reading=0.6ml
Volume of NaOH used =34.5ml -0.6ml=33.9ml
Titration 2:
Final reading =34.3ml
Initial reading=0.85ml
Volume of NaOH used =34.3ml -0.85ml=33.45ml
Titration 3:
Final reading =33.8ml
Initial reading=0.45ml
Volume of NaOH used =33.8ml 0.45ml=33.35ml
Hope it helps:)
What is the mass of oxygen in 1 mole of NaHCO3?
Answer:
48.00
Explanation:
3 oxygen (15.99 x 3)= 48
An electric current is produced when ______________________ move continuously batteries magnets electric charges wires
Answer:
electric charges.
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.
An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
30. A5.30 g of Na2CO3 is dissolved in a 400.0 mL solution. What is the molarity for this solution?
A. 0.0133 M
B. 0.0500 M
C. 0.125 M
D. 13.3 M
Can someone help me with this?
How many grams of AlCl3 are needed to completely react with 2.25 of NaOH?
Answer:
omg my friends name is Noah
Explanation:
What happens when the limiting reactant of a reaction runs out?
O excess reactants begin combining.
O reaction stops
O reaction slows down.
O reaction speeds up.
conclusion on friendship
Explanation:
Conclusion. A good friendship is very difficult to come across. That is why we should appreciate this divine relationship that is based on understanding and feelings. ... A true friend is one of the most precious possessions that one can have in his life.Hope it's helpful for Yuh bro!!
Answer:
Friendship is, in many respects, a "comfortable" love relationship. Friendships involve as little or as much intimacy as the partners are inclined to express at any given time. Friends are not normally obligated to exchange benefits, but do so in ways that are often so natural as to be unwitting. The ties that bind them are by unfettered mutual consent. In spite of its being so comfortable, in fact because of it, friendship contributes in unique ways .
When calcium metal is placed in water a vigorous single replacement rection occurs, releasing hydrogen gas. What will happen to the pH of the solution that forms as this chemical reaction proceeds
Answer:
The pH of the solution increases
Explanation:
One of the properties of metals is that they react with water to yield hydrogen gas and the hydroxide of the metal.
Calcium is a metal in group two of the periodic table and also undergoes such reaction.
The equation of the reaction is;
Ca(s) + 2H2O(l) -----> Ca(OH)2(aq) + H2(g)
Since Ca(OH)2 is alkaline, the pH of the solution increases.
Suggest a substance that can be used to neutralise sulfuric acid.
answer this please
Sodium Carbonate, Sodium Bicarbonate or Sodium Hydroxide.
Identify the correct formula for each of the following acids. Click here to use the common polyatomic ion sheet if needed.
Hydrochloric acid
HClO2
HClO3
HCl
Answer:
HCl
H3PO4
Explanation:
The formula of hydrochloric acid is HCl. It contains one hydrogen and one chlorine atom. And thus all other options with O is wrong and option C is correct.
What is hydrochloric acid?
Hydrochloric acid is a strong acid having the formula HCl. Thus one mole of hydrochloric acid contains one hydrogen atom and one chlorine atom. No other elements such as oxygen is present in it.
The electronegativity of chlorine is very higher compared to hydrogen and they attracts by hydrogen bond. Each atom shares one electron with the other atom and thus it can also said as they are covalently bonded.
Hydrochloric acid is used in many industrial uses and it is present even in our stomach to aid digestion. Since it is very strong acid it may cause sever damages to skin if and its vapor causes respiratory issues when comes in contact.
Therefore, the correct formula of hydrochloric acid is HCl, option C is correct.
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Select all examples that apply as a physical changes in properties (please help)
A 2.0 mL sample of air in a syringe exerts a pressure of 1.02 atm at 22 C. If that syringe is placed into boiling water at 100 C and the pressure in the syringe increases to 1.27 atm, what is the new volume of the air in the syringe?
Answer: The new volume of the air in the syringe is 7.3 mL.
Explanation:
Given: [tex]V_{1}[/tex] = 2.0 mL, [tex]P_{1}[/tex] = 1.02 atm, [tex]T_{1} = 22^{o}C[/tex]
[tex]V_{2}[/tex] = ?, [tex]P_{2}[/tex] = 1.27 atm, [tex]T_{2} = 100^{o}C[/tex]
Formula used to calculate the new volume in syringe is as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{1.02 atm \times 2.0 mL}{22^{o}C} = \frac{1.27 atm \times V_{1}}{100^{o}C}\\V_{1} = 7.3 mL[/tex]
Thus, we can conclude that the new volume of the air in the syringe is 7.3 mL.
Can the excess reactant control the percentage yield?
Please answer
Answer:
Yes, it can.
Explanation:
The percentage yield is decreased if the reactants do not completely form the products. To make a given mass of product, a process with a low percentage yield requires more of the reactants than a process with high percentage yield.
which type of star will have the longest lifespan
Answer:
Red dwarfs
Explanation:
Hope it helps!
hellppp i have a quiz please
hindi ko po maintindihan
what physical and social systems are involved in the service industry
Answer:
Hey mate.....
Explanation:
This is ur answer........
For example, the communications industry includes all of the physical and social systems that produce books, newspapers, magazines, radio and television broadcasts, billboard advertisements, Internet websites, telephones, and telecommunications, such as the GPS.
Hope it helps!
Brainliest pls!
Follow me! :)
my chem test is tomorrow!! please help
Answer:
The pH of the pure water is not always neutral but actually sometimes it can be slightly acidic but not of the same extent or value as HCl obviously. However ,it is enough to result to a color change in the presence of phenolphthalein.
Explanation:
I will try to be brief and spare the boring details .Basically ,this is caused by the reaction of water and CO2 that is naturally present in the atmosphere to produce a weak acid known as carbonic acid.
~Hope this helps:)
please look at the attached photo
When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO2 and 1.01 g of H2O were produced. What is the empirical formula of the compound?
Answer:
C₂H₆O
Explanation:
Empirical formula is the simplest ratio of atoms present in a molecule. To solve this question we must find the moles of C, H and O in order to find the simplest ratio of this atoms.
To solve this question we must find the moles of C from CO2, moles of H from H2O and moles of O from the difference of masses of C and H and the sample:
Moles C:
1.64g CO2 * (1mol / 44g) = 0.03727 moles CO2 * (1mol C / 1mol CO2) = 0.03727 moles C
0.03727 moles C * (12g / mol) = 0.4473g C
Moles H:
1.01g H2O * (1mol / 18g) = 0.05611 moles H2O * (2mol H / 1mol H2O) =
0.1122 moles H
0.1122 moles H * (1g / mol) = 0.1122g H
Moles O:
0.860g - 0.1122g H - 0.4473g C = 0.3005g O * (1mol / 16g) =
0.01878 moles O
The ratio of the moles of atoms regard to the moles of O (Lower number of moles) is:
C = 0.03727 moles C / 0.01878 moles O = 1.98 ≈ 2
H = 0.1122 moles H / 0.01878 moles O = 5.97 ≈ 6
O = 0.01878 moles O / 0.01878 moles O = 1
Empirical formula is:
C₂H₆OHI! I REALLY NEED HELP, THANK YOU!!
Answer:
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles. The difference in mass between the reactants and products is manifested as either the release or the absorption of energy.
Explanation: Read this and you might be able to figure it out for yourself ☺️☺️☺️