Answer:
A synthesis reaction is a reaction that occurs when two or more reactants combine into one product.
Explanation:
A reaction that occurs when two or more reactants combine into one product is called a synthesis reaction.
A reaction that occurs when one element within a compound is exchanged with another element is called a single replacement reaction.
A reaction that occurs when a substance combines with molecular oxygen, releasing light and energy is called combustion.
A reaction that occurs when a single substance breaks apart and forms two or more new substances is called decomposition.
Write the molecular formula of poly(glycine)
Answer:
C2H5NO2
Explanation:
Glycine | C2H5NO2 - PubChem.
weight of glycine= 75.07 g/mol
Why are infants and children often more susceptible to the effects of toxic substances than adult? (Explain)
From what I know personally from learning about this type of subject in the past is that children are more susceptible to the effects of toxic substances more than adults are, certain scientific data specifically indicate that children actually are for all intents and purposes more basically susceptible to toxic exposure than adults because they for the most part have proportionally definitely more intake of food contaminants, basically active developmental processes, basically multiple exposure pathways and really susceptible kind of socio-behavioral activities in a particularly major way.
Iodine-131 half life 8.040 how long will it take for a 40 gram sample of iodine-131 to decay to 0.75 grams
Answer:
See explanation below
Explanation:
To get this, we need to apply the general expression for half life decay:
N = N₀e(-λt) (1)
Where:
N and N₀ would be the final and innitial quantities, in this case, masses.
t: time required to decay
λ: factor related to half life
From the above expression we need λ and t. To get λ we use the following expression:
λ = t₁₂/ln2 (2)
And we have the value of half life, so, replacing we have:
λ = 8.04 / ln2 = 11.6
Now, we can replace in (1) and then, solve for t:
0.75 = 40 exp(-11.6t)
0.75 / 40 = exp(-11.6t)
ln(0.01875) = -11.6t
-3.9766 = -11.6t
t = -3.9766 / -11.6
t = 0.34 daysA 125.0-g sample of a metal heated to 100.0 ∘C and placed in a calorimeter that contains 250.0 g of water. The temperature rises from 24.3 ∘C to 27.2 ∘C. What is the specific heat capacity of the metal? Ignore the calorimeter in your analysis. Group of answer choices
Answer:
0.333J/g°C is the specific heat of the metal
Explanation:
The heat that the metaal gives is equal to the heat that water is absorbing. The equation is:
S(metal)*ΔT(metal)*Mass(metal) = S(H2O)*ΔT(H2O)*Mass(H2O)
Where S is specific heat, ΔT is change in temperature and mass the mass in grams of the metal and water.
Replacing:
S(metal)*(100.0°C-27.2°C)*125.0g = 4.184J/g°C*(27.2°C-24.3°C)*250.0g
S(metal) = 4.184J/g°C*(27.2°C-24.3°C)*250.0g / (100.0°C-27.2°C)*125.0g
S(metal) = 0.333J/g°C is the specific heat of the metal
Please help is for my final An example of a chemical change is-
evaporation of seawater
о
sublimation of dry ice (CO2)
melting of aluminum
burning wood reducing it to ashes
Explanation:
Souring of milk
Baking of cake
Which is the correct Lewis dot structure of NH2?
H-N-H
H-N-H
A.
B.
N-H-H
H-N-H
C.
D.
-H-N-H
E.
ОА А
ов. В
C C
OD D
ОЕ Е
Answer:
D
Explanation:
Would an alkali metal make a good replacement for tin in a tin can? Explain.
Answer:
No
Explanation:
If tin is heated, it can react with alkalis' with the release of hydrogen.
Tin is a great metal that is used for packaging purposes.
It does not react with any acid that may be present in the food material stored inside the tin can which makes it a useful metal. It keeps the food safe.However, if the tin in the tin can is replaced with alkali metals then they will readily react with the acid present in the food materials stored inside, thereby rendering the food unsafe.
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calculate the ph of the solution [oh-] = 1x 10-11 m
a. 11.0
b. 12.0
c. 2.7
d. 3.0
Answer:
d. 3.0
Explanation:
First we calculate the pOH of the solution, using the following formula:
pOH = -log[OH⁻]pOH = -log[1x10⁻¹¹ M]pOH = 11.0Using the pOH we can calculate the pH of the solution, keeping in mind the relationship between pH and pOH:
pH = 14.0 - pOHpH = 14.0 - 11.0pH = 3.0The answer is option d.
How is a radioactive element different from a stable element?
Radioactive elements are the elements into which an atom is very unstable or highly reactive because it is having more energy in its nucleus. stable elements are those who have stable and there shell are properly filled with electrons.
What are radioactive elements and stable elements?Most radioactive chemical elements have one or more radioactive isotopes on the other hand some chemical elements only have one type of radioactive isotopes.
A radioactive element has an unstable nucleus that emits particles in the form of alpha, beta, or gamma radiation and stable element have stable nucleus with no effect of any radiation or energy due to fully filled orbitals.
Bombarding of these radiations has to be done in the nucleus of the element after this the desired element will become a radioactive element. And there is no effect of these rays on stable elements beacuse they are unreactive to this.
The ray of alpha beta and gamma consists of some charges within them and they are radioactive radiations harmful to human eyes.
Learn more about radioactive elements, here:
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What can be different between the products and reactants in a balanced chemical equation?
Answer:Reactants are starting materials and are written on the left-hand side of the equation. Products are the end-result of the reaction and are written on the right-hand side of the equation.
Explanation:
The reactants in a balanced chemical reaction are the starting material which reacts together to give the products in by the regrouping of atoms in the reactants.
What is a balanced chemical equation?The balanced chemical equation of a reaction represents the perfect stoichiometry of each reactants and products with their states of matter in brackets.
In a balanced reaction, the number of each element in the reactant side must be equal to their number in the product side. The number of each elements and groups in a reaction can be balanced by multiplying with suitable integers.
The atoms in the reactants are regrouping to form the products. Thus, the identity of the new products is entirely different form that of reactants in the reaction.
To find more on balanced reactions, refer here:
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Name the sub atomic particles in part Z of a boron atom give the relative charges of these sub atomic particles
Answer:
Neutrons and protons
Explanation:
There are three fundamental subatomic particles, these are;neutrons protons and electrons.
Ernest Rutherford successfully showed that every atom does possess a central core that contain positively charged particles (protons) called the nucleus. Chadwick later discovered the existence of neutrons.
Both protons and neutrons are found in the nucleus. Z represents the nucleus of the boron atom and houses the neutrons and protons of the boron atom.
PLS HELP FOR FINAL!!!!!!!!!!!!!!
Answer:
The answer is Ernest Rutherford.
Answer :
Ernest RutherfordHope I helpGood Luck
Balance the following equations.
Answer:
A) Mg + H2SO4 → MgSO4 + H2
B) CaCO3 + 2HCl → CaCl2 + H2O + CO2
C) CaO + H2O → Ca(OH)2
D) 3Ag + 4HNO3 → 3AgNO3 + H2O + NO2
Explanation:
A) Mg + H2SO4 → MgSO4 + H2
The equation is already balanced because the number of each element in the left hand side is already equal to that in the right hand side.
B) CaCO3 + 2HCl → CaCl2 + H2O + CO2
This equation is balanced by putting 2 in front of HCl on the left hand side to balance the elements on the right hand side.
C) CaO + H2O → Ca(OH)2
Thus equation is already balanced because the number of each element in the left hand side is already equal to that in the right hand side.
D) 3Ag + 4HNO3 → 3AgNO3 + H2O + NO2
This equation is balanced by putting 3 in front of Ag and 4 in front of HNO3 on the left hand side while we put 3 in front of AgNO3 on the right side to balance the elements on the right hand side.
How many days does it take the moon to orbit the Earth once.
Answer:
27.3 days
Explanation:
I really have no explanation lol.
Answer:
Hope thia helps
Explanation:
it takes 27.3 days!!!
M
Mass can be measured in local units like dharni pau eto. Discuss the advantages of using
standard units of mass over the local units of mass. (Any two points)
N2 Points)
soup answer
Answer:
1.They are reliable.
2.They dont vary from person to person
what type of reaction is Pb + CuCl2 ---> PbCl2 + Cu
The above reaction is a Single displacement reaction , in which lead (Pb) being more reactive displaces Copper (Cu) from its compound [tex](\mathrm{CuCl_2})[/tex] and forms Lead Chloride [tex](\mathrm{PbCl_2})[/tex].
[tex] \boxed{\mathrm{Pb + CuCl_2 \rightarrow PbCl_2 + Cu}}[/tex]
_____________________________
[tex]\mathrm{ \#TeeNForeveR} \: ☃[/tex]
During a combustion reaction, 9.00 grams of oxygen reacted with 3.00 grams of CH4.
What is the amount of the leftover reactant?
0.74 grams of methane
0.89 grams of methane
1.22 grams of oxygen
1.45 grams of oxygen
Answer:
0.74
Explanation:
this is the correct answer. I followed a correct answer that had the same probelm with different values, swithxed it with mine, and got 0.75. So its basically 0.74
Describe the law of conservation of mass in your own words *DO IT IN YOUR OWN WORDS PLEASE*
Answer:
Chemical reactions and physical transformations do not create or destroy mass in an isolated system, according to the law of conservation of mass. The mass of the products in a chemical reaction must equal the mass of the reactants, according to the conservation of mass law. The law of conservation of mass can be used to solve for unknown masses, such as how much gas is consumed or produced during a reaction.
Collisions only result in a reaction if the particles collide with a certain maximum energy called the activation energy of the reaction.
Answer: The statement collisions only result in a reaction if the particles collide with a certain maximum energy called the activation energy of the reaction, is false.
Explanation:
Activation energy is the minimum amount of energy required to initiate a chemical reaction.
So, when activation energy for a reaction is lower then molecules with lower energy can also participate in the reaction. As a result, more number of collisions will take place due to which an increase in the rate of reaction will takes place.
When activation energy for a reaction is larger then molecules with higher energy will not be able to participate in the reaction. As a result, less number of collisions will take place due to which a decrease in rate of reaction will occur.
Therefore, we can conclude that the statement collisions only result in a reaction if the particles collide with a certain maximum energy called the activation energy of the reaction, is false.
Answer:
true
Explanation:
particularly must collide with energy equal to or greater the
The best way to increase the amount of a solid solute dissolved in a saturated solution would be to
Answer:
The solubility of a saturated solution can be increased by increasing the temperature.
Explanation:
Temperature -- Generally, an increase in the temperature of the solution increases the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water than in cold water. A few solid solutes, however, are less soluble in warmer solutions.
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C.
Show that the results of these dulys
Calculate the oxidation state of Manganese in the following
i. KMnO4 ii. Mno4-
i) KMnO4
lets calculate using x method
1+x+ 4(-2) = 0
1+x-8 =0
x= 7
ii)MnO4‐
x+4(-2) = -1
x-8 = -1
x = 7
Is sulfur pentoxide a ionic or covalent bond?
pls help it's about density
PLSSS HELP WITH THIS ASAP
Answer:
the property of air shown in the figure describe A.mass
0.630 moles of sodium chloride are how many grams (with calculation)
Answer:
Heyaa!! Im Pinky and Im here to inform you that your answer is...
Explanation:
!!! 36.8189451 Grams !!!
Have an amazing day!!!
~Pinky~!!
How many moles are in a solution with a concentration of 5 M and a volume of 0.25 L?
Answer:
160 mL
Explanation:
A sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure
were changed to 760 mmHg at the same temperature?
show work
P1: 741 mmHg
V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L
P2: 760 mmHg
V2: ? L
If a book has a weight of 23.2 N on Earth, what is its mass?
Answer: Mass is 2,37 kg
Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.
m = W/g = 23.2 N / 9.81 m/s²
Will lithium become a cation or anion?
Answer:
Lithium Cation is a monovalent cation that is metabolized much like sodium and is important in many cellular functions inside or on the surface of cells. lithium has a single valence electron that is easily given up to form a cation. Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals
a concentrated solution of sulfuric acid, H2SO4, has a concentration of 18.0 M. How many mL of the concentrated acid would be required to make 250. mL of a 1.00 MH2SO4 solution?
Answer: A 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.
Explanation:
Given: [tex]M_{1}[/tex] = 18.0 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 1.00 M, [tex]V_{2}[/tex] = 250 mL
Formula used to calculate the volume of concentrated acid is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\18.0 M \times V_{1} = 1.00 M \times 250 mL\\V_{1} = \frac{1.00 M \times 250 mL}{18.0 M}\\= 13.88 mL[/tex]
Thus, we can conclude that 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.