Answer:
Explanation:
[tex]N=N_0(\frac{1}{2} )^\frac{t}{T}[/tex] , T is half life , t is time taken to reduce N₀ to N .
1/3 = [tex](\frac{1}{2})^\frac{10}{T}[/tex]
taking log on both sides
-log3 = 10/Tx log.5
T = 10 x log .5 / - log 3
= 10 x -.3010 / - .4771
= 6.31 hours .
An element that has an electronegativity value of zero
Answer:
Noble gases
Explanation:
Noble gases
If the compound below is oxidized, the resulting product is ___. Select one: a. methane and propane b. butanal c. butanoic acid d. butane
The complete question is
If the compound below is oxidized, the resulting product is ___.
the compound given is Butanal
Select one:
a. methane and propane
b. butanal
c. butanoic acid
d. butane
Answer:
C. Butanoic Acid
Explanation:
When Butanal is oxidized using reagents like KMnO4, Tollens reagent etc.
When Aldehyde is oxidized corresponding Carboxylic Acid is produced
Butanal → Butanoic Acid
What does "Telescopically" mean?
A- to communicate via phone
B- To use a telescope
C- to viee close distances
D- To see without a device
Answer:
It is b to use a telescope
Answer:
B
Explanation:
If 342.2 grams of C12H22O11 (sucrose) is dissolved in 1.0 L of solution. What is the molar concentration of the solution? Report your answer with the correct number of significant figures.
Answer:
M = 1 M
Explanation:
Given data:
Mass in gram = 342.2 g
Volume of solution = 1.0 L
Molar concentration = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of sucrose:
Number of moles = mass/molar mass
Number of moles = 342.2 g/ 342.2 g/mol
Number of moles = 1 mol
Molarity:
M = 1 mol / 1.0 L
M = 1 mol/L
M = 1 M
The molar concentration of the solution is :
- M = 1 M
Check below to see the full solution.
Molar ConcentrationMolarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
What information do we have?
Mass in gram = 342.2 g
Volume of solution = 1.0 L
Molar concentration = ?
Number of moles of sucrose:
Number of moles = mass/molar mass
Number of moles = 342.2 g/ 342.2 g/mol
Number of moles = 1 mol
Molarity:
Molarity = number of moles of solute / L of solution
M = 1 mol / 1.0 L
M = 1 mol/L
M = 1 M
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1. The
in an atom of that element.
number of an element equals the number of protons
2. The exact position of the electrons of an atom cannot be determined because they are
in constant
to the nucleus of an atom have the least
3. The electrons
amount of energy
4. The number of
bonds that atom can form.
in an atom tells you how many chemical
Answer:
1. Proton = electron if the element is not in an ionic state
proton = atomic number
Which particles are equal in number for an atom with a neutral charge?
A mixture of propane and butane is burned with pure oxygen. The combustion products contain 46.7 mole% H2O. After all the water is removed from the products, the residual gas contains 69.0 mole% CO2 and the balance O2 a. What is the mole percent of propane in the fuel?
Answer:
28%
Explanation:
Basically, all o did was write the equations, balance it and solve for them. Also, at the place I stared, I used simultaneous equation to solve it. Multiplying by 8 and also 3.
It's a pretty straightforward question.
At the final step that's missing, I Did
(y)C3H8 = 2.8 / ( 2.8 + 7.1)
(y)C3H8 = 0.28
The Law of Superposition is most relevant when studying which type of rock?
A.
metamorphic
B.
granite
C.
sedimentary
D.
igneous
Answer:
Sedimentary
Explanation:
Sedimentary rock is formed when pieces of eroded earth are deposited in layers. These layers are piled upon one another, slowly pressed down into the earth, and pressurized to become rock. The Law of Superposition states that, of these layers, the younger are found on top of the older.
The Law of Superposition is most relevant when studying this type of rock: C. sedimentary.
A sedimentary rock can be defined as a rock that is typically formed as a result of the accumulation, lithification or deposition of sediments (minerals or organic particles) at or near Earth's surface.
According to Nicolas Steno, the four (4) laws of stratigraphy include the following:
Law of original horizontality.Law of cross-cutting relationships.Law of lateral continuity.Law of superposition.Steno's Law of Superposition states that within a sequence of rock layers (rock strata) in sedimentary rocks, the oldest (first) strata lies at the base (bottom) of the sequence while younger (newer) strata sit atop the older strata.
Hence, the sequence of rock layers (rock strata) in sedimentary rocks typically marks the time of deposition of each of the rock layers according to Steno's Law of Superposition.
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Complete the sentence by using "Direct", "Inverse", or equal. The pressure and volume of a gas change in opposite directions. This can be described as an " upside-down" relationship. We can also say that the relationship between the pressure and volume of a gas is a __________________ relationship
answer:
i believe the answer is inverse.
if i'm wrong sorry :(
if i'm right your welcome :)
What is the coefficient of oxygen (O_2) in the balanced equation for the reaction written below?
Answer:
1 is your coefficient of oxygen
Explanation:
hope it helps
List four observations that suggest chemical change is occurring
Answer:
Examples of Chemical Changes
Burning wood.
Souring milk.
Mixing acid and base.
Digesting food.
Cooking an egg.
Heating sugar to form caramel.
Baking a cake.
Rusting of iron.
Which of the following is NOT a
homogenous mixture?
Answer:blacks screen. No answers to choose from. Thanks for the points:))
Explanation:
yeha so i went to ther e htctct
Answer:
hi
Explanation:
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
you cool
and what is this about?
How many electrons (total number) are in the ion, CO3(2-) ?
Select one:
a.30
b. 24
c. 32
d. 16
1. Consider the reaction of magnesium metal with hydrochloric acidity produce magnesium chloride and hydrogen gas. If 36.03g of magnesium and 55.10g of hydrochloric are reacted , how many grams of hydrogen gas are produced?
2. How many magnesium chloride are formed from the previous reaction?
Answer:
Mass magnesium chloride produced = 71.88g
Mass of hydrogen gas produced = 1.51 g
Explanation:
Given data:
Mass of magnesium = 36.03 g
Mass of HCl = 55.10 g
Mass of hydrogen gas produced = ?
Mass of magnesium chloride produced = ?
Solution:
Chemical equation:
Mg + 2HCl → MgCl₂ + H₂
Number of moles of Mg:
Number of moles = mass/molar mass
Number of moles = 36.03 g/ 24.3 g/mol
Number of moles = 1.48 mol
Number of moles of HCl:
Number of moles = mass/molar mass
Number of moles = 55.10 g/ 36.5 g/mol
Number of moles = 1.51 mol
Now we will compare the moles of hydrogen and magnesium chloride with HCl and Mg.
Mg : H₂
1 : 1
1.48 : 1.48
HCl : H₂
2 : 1
1.51 : 1/2×1.51 = 0.755
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 0.755mol × 2 g/mol
Mass = 1.51 g
Mg : MgCl₂
1 : 1
1.48 : 1.48
HCl : MgCl₂
2 : 1
1.51 : 1/2×1.51 = 0.755
Mass of magnesium chloride:
Mass = number of moles × molar mass
Mass = 0.755mol × 95.211g/mol
Mass = 71.88g
Based on the synthesis reaction, what would the product of the reaction be? NaPO3 + CuO → ? NaO + CuPO3 Na + P + Cu + O4 NaCuPO4 NaCu + PO4
Answer:
C
Explanation:
Based on the synthesis reaction,the product of the given chemical equation is NaCuPO4 .
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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What does “circulate” mean in this passage?
Sentence : “When certain mosquitoes bite someone, marlaria enters that persons blood, allowing the disease to circulate.”
Answer:
Below
Explanation:
Move or cause to move continuously or freely through the blood.
A student is building an electrical circuit. Which material should she choose for the wires, and why?
A. A noble gas such as krypton, because its atoms are far apart and it is nearly inert
B. A nonmetal such as carbon, because its atoms have tightly bound electrons
C. A metalloid such as germanium, because only some of its atoms have mobile electrons
D. A metal such as copper, because its atoms have very mobile electrons
Answer:
d
Explanation:
Answer:
d
Explanation:
Would you expect Nio to dissolve in an aqueous solution of NaNO3?
Answer:
NiO Does Not Dissolve In An Aqueous Solution Of NaNO3.
Explanation:
The function of hair is to:
a. protect skin from ultraviolet light
b. regulate temperature
C. help keep particles out of eyes and nose
d. all of the above
Answer:
D I think. I'm not sure. I think it's all of them
lab
table b:eyedrop of blue water in cold water
table c:eyedrop of red water in hot water
table d:see how temperature changes on white + black paper with light shining on them
plz help
brainliest for 1st correct answer
Answer:
lol, I just did this assignment, cold water
0:30: slowly expand
1:00: still expanding
1:30: expanding is continued
2:00: still expanding slowly
2:30: expanding slowly
3:00: expanded twice the size from the first time
hot water
0:30: expanding quickly
1:00: still expanding
1:30: starts to reach the surface and still expanding
2:00: almost all the of the dye reached the top
2:30: the dye reached the top and is starting to split
3:00: the dye split appart and is moving down again
radiation
white paper
0:30: at a low temp. at around 3.3 C
1:00: still at a low temp. around 4.4 C
1:30: slowly rising temp. around 5.5 C
2:00: still slowly rising temp. around 7.2 C
2:30: still at a low temp. around 8.3 C
3:00: ends at a low temp. around 10 C
black paper
0:30: at a resonable temp. at around 6.6 C
1:00: temp. rises quicker at around 13.3 C
1:30: temp. stil rising quickly at around 17.7 C
2:00: temp. is getting hotter at around 21.6 C
2:30: temp. is still getting hotter at around 26.1 C
3:00: temp. ends at a hot temp. at around 30 C
Explanation:
- What part of the ocean absorbs a large amount of solar energy?
Answer:
artic ocean
Explanation:
what is the form of light
Answer:
most likely Energy that's what I'm thinking
At his favorite restaurant, Dylan orders a soda with his dinner. The ice in his drink has a mass of 6 g and a volume of 20 cm3. What is the density of the ice? Explain the steps you took to solve this problem, showing your work.
What is the pH after two solutions are mixed: 1. A 0.155 M H2SO4 solution with a volume of 35.0 mL and 2. A 0.225 M solution of KOH with a volume of 35.0 mL. The volumes are additive.
Answer:
[tex]pH=1.67[/tex]
Explanation:
Hello.
In this case, since the reaction between the sulfuric acid and the potassium hydroxide is:
[tex]2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O[/tex]
We can see a 2:1 mole ratio between them, thus, we compute the moles of acid and base that are present in the solution by using the employed volume and its concentration:
[tex]n_{H_2SO_4}=0.155mol/L*0.0350L=0.005425molH_2SO_4\\\\n_{KOH}=0.225mol/L*0.0350L=0.007875molKOH\\[/tex]
Next, we use the 2:1 mole ratio to compute the consumed moles of acid:
[tex]n_{H_2SO_4}^{consumed}=0.007875molKOH*\frac{1molH_2SO_4}{2molKOH}=0.0039375molH_2SO_4[/tex]
It means that the leftover of sulfuric acid is:
[tex]n_{H_2SO_4}^{leftover}=0.005425-0.0039375=0.001488molH_2SO_4[/tex]
Therefore, since sulfuric acid is a strong acid, the pH is defined in terms of its concentration which is actually equal to the concentration of hydrogen ions in solution, which is computed considering the total additive volume:
[tex][H^+]=[H_2SO_4]=\frac{0.001488mol}{0.070L}=0.02125M[/tex]
So the pH turns out:
[tex]pH=-log(0.02125)\\\\pH=1.67[/tex]
Best regards.
C. If an electron is added to the outer shell, how will this affect the charge and volume of the atom?
if an electron is added on the outer shell
Answer:
An atom that gains or loses an electron becomes an ion. If it gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion.
Answer:
when an atom gains an electron, it gains a negative charge . it's volume increases as well due to the increase in repulsion between the electrons
How is emission spectra produced?
Answer:
emission spectra are produced by thin gases in which the atoms do not experience many collisions (because of the low density). The emission lines correspond to photons of discrete energies that are emitted when excited atomic states in the gas make transitions back to lower-lying levels.
Explanation:
A dark-line, or emission spectrum, will be formed when light passes through a cloud or gas at a temperature lower than the temperature of the light source.
What is emission spectra ?
An atom's electrons usually are arranged in a way that keeps the atom's energy as low as possible. The atom's lowest energy state is the atom's ground state. The electrons in those atoms take up the energy and move to a higher energy level when it is given to them. Atomic electrons must move from one energy level to another in discrete steps rather than continuously because these energy levels are quantized. An atom is in an excited state when its potential energy is greater than that of the ground state. In the excited state, an atom is unstable. The energy it gained previously is released as electromagnetic radiation when it returns to the ground state.Atoms initially acquire energy. One way is to pass an electric flow through an encased example of a gas at low strain. Every gas discharge tube will glow in a unique color depending on the gas's identity because the electron energy levels are unique to each element.Atomic emission spectra, also known as line-emission spectra, could not be explained by classical theory. A ground state atom would be capable of absorbing any amount of energy rather than just discrete amounts, as predicted by classical physics. Similarly, any amount of energy could be released when the atoms relaxed back into a lower energy state. A continuous spectrum, in which all wavelengths and frequencies are represented, would emerge as a result of this.To know more about emission spectra check this:
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According to the nissani what can be some possible ways to save the forest of third world countries
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, there are ways to save the forest of third world countries - this includes
1) Creating of forest reserves: Wide areas of land that are still forested can still be preserved and converted to forest reserves which can prevent these areas from being deforested as a result of human activities or industrialization.
2) Government policies: Government can put policies in place to prevent people from embarking on deforestation of certain lands. This is because some parts of the third world countries still rely on wood for cooking and other sources of daily activities.
3) Replanting of deforested areas: Replanting of trees can also help third world countries in saving the forest.
Why do we need to identify matter?
Answer:
It's important for scientists to know the properties of matter because all things are made up of matter. Each type of matter has different physical characteristics and scientists need to know and understand these characteristics to make calculations. ... The main phases of matter are solid, liquid, and gas
Explanation:
^^
True or false, physical properties are distinguished by the way something looks, taste, smell, and feels.
Answer:
True
Explanation:
Physical properties are based on all of our five senses, so yeah