Is the rate of decay fastest at the beginning, middle, or end of the process?
Answer:
The beginning
Explanation:
In a nuclear reaction, the rate of decay is fastest at the beginning of the process.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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How does solubility impact the temperature?
Answer:
For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
Explanation:
Make sure to edit so you do get copy-writed
Does sodium satisfy the octet rule?
Answer:
The rule is especially applicable to carbon, nitrogen, oxygen, and the halogens, but also to metals such as sodium or magnesium. ... All four of these electrons are counted in both the carbon octet and the oxygen octet, so that both atoms are considered to obey the octet rule.
Heeeeelppppp! Serious answers only
Please :(
Answer:
1. A
2. C
Explanation:
Answer:
there are 3 elements in question 1 and 4 atoms in question 2
Explanation:
Polyacrylamide is used in manufacturing soft contact lenses. It consist of 50.69% carbon, 19.71% nitrogen, 7.09% hydrogen, and 22.51% oxygen. Calculate the empirical formula for polyacrylamide.
Answer: The empirical formula is [tex]C_3NH_5O[/tex].
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of C = 50.69 g
Mass of N= 19.71 g
Mass of H = 7.09 g
Mass of O = 22.51 g
Step 1 : convert given masses into moles.
Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{50.69g}{12g/mole}=4.22moles[/tex]
Moles of N=[tex]\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{19.71g}{14g/mole}=1.41moles[/tex]
Moles of H=[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{7.09g}{1g/mole}=7.09moles[/tex]
Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{22.51g}{16g/mole}=1.41moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C =[tex]\frac{4.22}{1.41}=3[/tex]
For N = [tex]\frac{1.41}{1.41}=1[/tex]
For H = [tex]\frac{7.09}{1.41}=5[/tex]
For O =[tex]\frac{1.41}{1.41}=1[/tex]
The ratio of C:N:H: O = 3:1:5:1
Hence the empirical formula is [tex]C_3NH_5O[/tex].
What mass of solute will dissolve in 100 grams of water at the following temperatures?
KCl at 80ºC
NaCl at 90ºC
NaNO3 at 10ºC
Answer:
D) NaNO3 at 10 °C
Explanation:
In this case, to know this, we need to watch the solubility curve of each compound to know which one is saturated or unsaturated in this case.
As you can see in the curve attached, let's analyze first what is an unsaturated solution.
An unsaturated solution is a solution where the quantity of solvent is in excess and the solute is completely dissolved in solution leaving no remains. This depends on the temperature of course. The solubility of one compound vary with the increase or decrease of temperature.
As you can see in the graph attached, what happens to the KCl? we can see that a 40 °C, you just need around g of solute to be dissolved, and be saturated so, this is not the correct choice.
If you watch NaCl, has similar behavior. You just need about 35 g of solute to be saturated.
Finally, the KNO₃ just need 60 g of solute to be dissolved in the solution, completely.
In the case of NaNO 10°C, we can see that at 40 °C it's not touching the curve, so we can assume that this is an unsaturated solution and it would be the correct choice.
Explanation:
Which is the role of the gall bladder? PLEASE HURRY I WILL MARK YOU BRAINLYEST
A:to provide physical digestion
B:to stored the liquid produce by the liver
C: to make the liquid that is stored in the liver
D: to decrease the chemical digestion
Answer:
The gallbladder is a pear-shaped, hollow structure located under the liver and on the right side of the abdomen. Its primary function is to store and concentrate bile, a yellow-brown digestive enzyme produced by the liver. The gallbladder is part of the biliary tract
Answer:
a.............................
Which of the following best describes H2(g) + Cl2(g) → 2HCl(9), AH = -184.6
kJ/mol?
A. The reaction requires heat.
B. The reaction has no activation energy.
C. The reaction is endothermic.
D. The reaction produces heat.
I’ll give ya brainliest
Answer:
D
Explanation:
ap
The statement that best describes the reaction [tex]\rm H_2(g) + Cl_2(g) \rightarrow 2HCl(9), AH = -184.6[/tex] is the reaction has no activation energy.
What is activation energy?Activation energy is the small amount of energy which is required to start a reaction.
This is the kinetic energy of the reactant molecules, which helps them to collide.
High activation energy means the reaction will be slow.
Low activation energy means a high rate of energy.
Thus, the correct option is B.
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If 8.2 g of sodium ethanoate produced 560 cm3 of methane (at s.t.p.). which one of the following is the percentage yield of the reaction;
A 2.5
B 4.0
C 12.0
D 25.0
The percentage yield of the reaction : 25%
Further explanationC₂H₃NaO₂(CH₃COONa)- Sodium ethanoate(MW=82,0343 g/mol)
Reaction
CH₃COONa + NaOH⇒CH₄+Na₂CO₃
mol CH₃COONa :
[tex]\tt \dfrac{8.2}{82.0343}=0.1[/tex]
mol CH₄=mol CH₃COONa = 0.1
mass CH₄ (MW=16.04 g/mol) :
[tex]\tt 0.1\times 16.04=1.604~g[/tex]⇒ theoretical
mol of 560 cm³(0.56 L) of methane (⇒1 mol = 22.4 L at STP) :
[tex]\tt \dfrac{0.56}{22.4}=0.025~mol[/tex]
mass CH₄ :
[tex]\tt 0.025\times 16.04=0.401~g[/tex]
[tex]\tt \%yield=\dfrac{0.401}{1.604}\times 100\%=25\%[/tex]
Why does the human eye see different colors?
Answer:
The human eye and brain together translate light into color. Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. ... Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors
Explanation:
i have advancedddd
What does the notation tt mean to geneticists? *
State whether the following are elements, compounds or mixtures
Salt
Sugar
Hydrogen
Oxygen
Tomato sauce
cake batter
Nitrogen
Aluminium
Gulab Jamun
Water
Salty water
Answer:
?
Explanation:
Answer:
hydrogen, nitrogen, oxygen, aluminium are elements
salt, sugar, tomato sauce, cake batter, salty water are mixtures
Explanation:
all the elements in the group halogens in the periodic table are compounds.
an_____is a trait that a organism inherits that makes it more suited to it's natural envormemt, helping it survive
adaptation may be i guess
Why do gases released by incinerators cause problems
Answer:
Waste incineration is one of many societal applications of combustion. ... Municipal solid-waste furnace designs have evolved over the years from ... To achieve complete combustion, gases produced must remain in the ... do not suffer rapping re-entrainment and dust layer back-corona problems associated with dry ESPs.
Explanation:
An ecologist is studying ecosystems in the rainforest biome. Which of the following is an
abiotic observation he would record?
Answer: any non-living thing
Explanation: abiotic means non-living
The Abiotic observation that the ecologist would record are ;
Soil type, Climate Precipitation and SunlightAbiotic factors in ecosystem are the non-living factors that play an essential role in determining how an ecosystem is different from other ecosystems. Some of the Abiotic factors that will distinguish ecosystems in the rainforest biome include ;
The temperature of the rainforestThe Soil type Climate conditions Precipitation and Amount of sunlight .Hence we can conclude that The Abiotic factors/observation that the ecologist would record are ; Soil type, Climate , Precipitation and Sunlight
The options to your question are missing hence a general answer is provided above
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Bromine has a higher ionization energy than chlorine
True or False
Answer:
Chlorine
Explanation:
Since chlorine is above bromine in the periodic table, following the trends of ionization energy in the periodic, the further up you go the more energy is required to ionize an atom.
For every action, there is an equal and opposite reaction.
Does the statement describe a scientific law?
Answer:
yeah its newton's third law
Explanation:
1. Raw egg to boiled egg.
2. Batter to idli.
3. Wet clothes to dry clothes.
4. Woollen yarn to knitted
sweater.
5. Grain to its flour.
6. Cold water to hot water.
7. Straight string to a coiled string.
8. Bud to flower.
9. Milk to Cheese.
10. Cowdung to biogas.
II. Ice cream to melted ice-cream.
12. Stretched rubber band to
its normal size.
13. Souring of milk.
14. Ripening of a mango.
15. Dissolving sugar in water.
these are reversible or Irreversible, chemical or physical, Natural or manmade, periodic or non periodic,desirable or undesirable?
Answer:
This is man made and natural
b) Calculate the relative atomic mass for magnesium using the information below (to 3
significant figures).
Magnesium has three common isotopes, magnesium-24, magnesium-25 and magnesium-26.
Their abundances are 79.0%, 10.0% and 11.0%, respectively.
Answer:
Relative atomic mass = 24.32 amu.
Explanation:
Given data:
Relative atomic mass of Mg = ?
Abundance of Mg-24 = 79.0%
Abundance of Mg-25 = 10.0%
Abundance of Mg-26 = 11.0%
Solution:
Relative atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Relative atomic mass = (79.0×24)+(10.0×25) +(11.0×26) /100
Relative atomic mass = 1896 + 250 + 286 / 100
Relative atomic mass = 2432 / 100
Relative atomic mass = 24.32 amu.
Question 4 (1 point)
How much energy is needed to melt 15.4 grams of water at 0 degrees Celsius? (AHrus-334 J/g)
b
21.7)
5.1)
5.1 kJ
21.7 kJ
с
d
How many atoms are there in 2.43 g of calcium?
Answer:
Explanation:
We're asked to calculate the number of atoms of
Ca
in
153
g Ca
.
What we must first do is convert the given mass of calcium to moles of calcium, using its molar mass (referring to a periodic table, this is
40.08
g
mol
):
153
g Ca
(
1
mol Ca
40.08
g Ca
)
=
3.82
mol Ca
Using Avogadro's number,
6.022
×
10
23
particles
mol
, we can calculate the number of atoms present:
3.82
mol Ca
(
6.022
×
10
23
atoms Ca
1
mol Ca
)
=
2.30
×
10
24
atoms Ca
What is the density of and object that is 100 grams and has a volume of 5 cubic centimeters?
J. 20 g/cm
K. 25 g/cm
L. 50 g/cm
M. 500 g/cm3
Explanation:
Density of object = gram/volume
= 100 g/ 5 cm³
= 20 g/cm³
The density of an object that is 100 grams and has a volume of 5 cubic centimeters is 20 g/cm³.
How do we calculate density?Density of any object will be calculated by using the below equation:
ρ = m/V, where
m = mass of object = 100g
V = volume of object = 5 cm³
On putting values we get,
ρ = 100/5 = 20 g/cm³
Hence required density is 20 g/cm³.
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What ion will be formed by the selenium atom shown below when it has a stable set of valence electrons?
Selenium atom
A. Se6+
B. Se2+
C. Se6-
D. Se2-
Answer:
Explanation:
D. Se2−
Selenium is in Group 16 of the periodic table, and it typically has 6 valence electrons. To achieve a stable set of valence electrons, it will either try to gain two more electrons to form Se²⁻or lose six electrons to form Se⁶⁺. Therefore, the correct option is option D.
An ion is an atom or a molecule that has gained or lost one or more electrons, resulting in an unequal number of protons and electrons. When an atom gains electrons, it becomes negatively charged and is called an anion. Conversely, when an atom loses electrons, it becomes positively charged and is called a cation.
Ions play a crucial role in chemical reactions and the formation of chemical compounds, as they are attracted to one another based on their opposite charges. This process helps stabilize the electron configuration and achieve a more stable, lower-energy state.
Thus, the ideal selection is option D.
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What do the colors represent?
Answer:
Dark Blue: Symbolizes integrity, knowledge, power, and seriousness. Blue: Peace, tranquility, cold, calm, stability, harmony, unity, trust, truth, confidence, conservatism, security, cleanliness, order, loyalty, sky, water, technology, depression, appetite suppressant.
Why are noble gases called "safe" gases?
Answer:
Noble gases are called "safe" gases because they are inert.
General Formulas and Concepts:
Reading a Periodic TableChemical Properties of Noble GasesExplanation:
Because Noble Gases have filled their outer shell electrons fully, they tend not to form compounds with other elements or react with others to produce another compound.
Take Ne (neon) for instance. It's electron configuration is 1s²2s²2p⁶. The outer most shell is the 2p sublevel, and according quantum numbers, the 2p sublevel only has 3 spaces for 2 electrons each that it can hold. Therefore, Ne has a full outer shell and no electron spots to create a bond with other elements.
A certain area receives a large amount of rain and some of it remained on top of the soil. What happened to the rest of the water
please help me with honors chem I will give brainliest answer
Answer:
see the pic for the answer
Our _____________ is affected by physical environment.
a.
pitch
b.
touch ethic
c.
behavior
d.
verbal communication
Answer:
is behavior
Explanation:
becuase behavior can be affected on the eviroment we are in
Our behavior is affected by physical environment.
What is physical environment?Individuals live, study, work, even play in their external surroundings. People's physical environments are influenced by the air those who breathe, the water they consume, the homes they reside in, and the vehicles they need to get to school and work.
What is behavior?The way someone acts was referred to as their behavior. That's what a person must do to make things happen, modify something, and maintain the status quo.
Our behavior is affected by physical environment.
Therefore, the correct answer will be option (c)
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can you help please??
Answer:
no
Explanation:
Answer:
The answer is B
Indicate the charge the following elements as they achieve the noble gas configuration.
Ga O Br P Rb As
S Mg Al Se Li I
Answer:
See explanation
Explanation:
Ga is in group 13 hence it must loose three electrons to form Ga^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
O is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form O^2- since oxygen has six electrons on its outermost shell.
Br in group 17 has seven electrons in its outermost shell hence it must form Br^- (gain one electron) in order to attain the noble gas configuration.
P in group 15 must accept three electrons and form P^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
S is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form S^2- since sulphur has six electrons on its outermost shell.
Mg in group 2 has two electrons on its outermost shell and must loose both to attain the noble gas configuration forming Mg^2+.
Al is in group 13 hence it must loose three electrons to form Al^3+ in order to achieve the noble gas configuration because it has three electrons on its outermost shell.
Se is in group 16 hence it must accept two electrons in order to attain the noble gas configuration to form Se^2- since selenium has six electrons on its outermost shell.
Lithium is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Li^+.
Rb is in group 1 and must loose its only outermost electron in order to attain the noble gas configuration to form Rb^+.
As in group 15 must accept three electrons and form As^3- in order to attain the noble gas configuration since it has five electrons on its outermost shell.
I in group 17 has seven electrons in its outermost shell hence it must form I^- (gain one electron) in order to attain the noble gas configuration.
