Answer: A
Explanation:
The density of a material is a/an
which sample is a pure substance?
a. a test tube of zinc oxide
b. a container of zinc and oxygen
c. a flask of pond water
d. a jar of soil
Answer:
The answer is A. Test Tube of zinc oxide
Two chemicals A and B are combined to form a chemical C. The rate, or velocity, of the reaction is proportional to the product of the instantaneous amounts of A and B not converted to chemical C. Initially, there are 100 grams of A and 50 grams of B, and for each gram of B, 2 grams of A is used. It is observed that 10 grams of C is formed in 7 minutes. How much is formed in 28 minutes? (Round your answer to one decimal place.) grams What is the limiting amount of C after a long time? grams How much of chemicals A and B remains after a long time? A grams B grams At what time is chemical C half-formed? t = min
Answer:
Follows are the solution:
Explanation:
A + B = C
Its response decreases over time as well as consumption of a reactants.
r = -kAB
during response A convert into 2x while B convert into x to form 3x of C
let's y = C
y = 3x
Still not converted sum of reaction
for A: 100 - 2x
for B: 50 - x
Shift of x over time
[tex]\frac{dx}{dt} = \frac{-k(100 - 2x)}{(50 - x)}[/tex]
Integration of x as regards t
[tex]\frac{1}{[(100 - 2x)(50 - x)]} dx = -k dt\\\\\frac{1}{2[(50 - x)(50 - x)]} dx = -k dt\\\\\ integral\ \frac{1}{2[(50 - x)^2]} dx =\ integral [-k ] \ dt\\\\\frac{-1}{[100-2x]} = -kt + D \\\\[/tex]
D is the constant of integration
initial conditions: t = 0, x = 0
[tex]\frac{-1}{[100-2x]} = -kt + D \\\\\frac{ -1}{[100]} = 0 + D\\\\D= \frac{-1}{100}\\\\[/tex]
hence we get:
[tex]\frac{-1}{[100-2x]}= -kt -\frac{1}{100}\\\\or \\\\ \frac{1}{(100-2x)} = kt + \frac{1}{100}[/tex]
after t = 7 minutes , [tex]C = 10 \ g = 3x[/tex]
[tex]3x = 10\\\\x = \frac{10}{3}[/tex]
Insert the above value x into [tex]\frac{1}{(100-2x)}[/tex] equation [tex]= kt + \frac{1}{100}[/tex] to get k.
[tex]\to \frac{1}{(100-2\times \frac{10}{3})} = k \times (7) + \frac{1}{100} \\\\ \to \frac{1}{(100- 2 \times 3.33)} = \frac{700k + 1}{100} \\\\ \to \frac{1}{(100-6.66)} = \frac{700k + 1}{100}\\\\ \to \frac{1}{93.34} = \frac{700k + 1}{100} \\\\[/tex]
[tex]\to 100 = 93.34(700k + 1) \\\\ \to 100 = 65,338k + 700 \\\\ \to 65,338k = -600 \\\\ \to k = \frac{-600}{ 65,338} \\\\ \to k= - 0.0091[/tex]
therefore plugging in the equation the above value of k
[tex]\to \frac{1}{(100-2x)} = kt +\frac{1}{100} \\\\\to \frac{1}{(100-2x)} = -0.0091t + \frac{1}{100}\\\\\to \frac{1}{(100-2x)} = \frac{1 -0.91t}{100}\\\\\to \frac{1}{2(50-x)} = \frac{1 -0.91t}{100}\\\\\to \frac{1}{(50-x)} = \frac{1 -0.91t}{50}\\\\\to 50= (1-0.91t)(50-x)\\\\\to 50 = 50-45.5t-x-0.91tx\\\\\to x+0.91xt= -45.5t\\\\\to x(1+0.91t)= -45.5t\\\\\to x=\frac{-45.5t}{1+0.91t}[/tex]
Let y = C
, calculate C:
y = 3x
[tex]y =3 \times \frac{-45.5t}{1+0.91t}[/tex]
amount of C formed in 28 mins
[tex]x = \frac{-45.5t}{1+0.91t} ,[/tex] plug t = 28
[tex]\to x = \frac{-1274}{1+25.48} \\\\\to x = \frac{-1274}{26.48} \\\\\to x= -48.26[/tex]
therefore amount of C formed in 28 minutes is = 3x = 144.78 grams
C: [tex]y =3 \times \frac{-45.5t}{1+0.91t}[/tex]
y= 136.5 =137
if 20 ml of carbon dioxide diffuse in 100 second what volume of ozone will diffuse in the same time under similar condition
volume of ozone : 19.15 ml
Further explanationGraham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
[tex]\tt \dfrac{r_{CO_2}}{r_{O_3}}=\dfrac{\sqrt{M_{O_3}} }{\sqrt{M_{CO_2}}} }[/tex]
rate of CO₂ , M CO₂ = 44,01 g/mol
[tex]\tt r~CO_2=\dfrac{20~ml}{100~s}[/tex]
rate of O₃, M O₃ = 48 g/mol[tex]\tt r~O_3=\dfrac{x}{100~s}[/tex]
volume of ozone
[tex]\tt \dfrac{r~{CO_2}}{r~O_3}=\dfrac{\sqrt{48} }{\sqrt{44.01} }\\\\\dfrac{20}{x}=\dfrac{\sqrt{48} }{\sqrt{44.01} }\\\\x=\dfrac{20.\sqrt{44.01} }{\sqrt{48} }=19.15~ml[/tex]
Describe how the particle motion is different from state to state.
Answer:
The particles in a gas are moving very quickly in random directions.
The particles in a solid are tightly packed and locked in place, and they are vibrating in their place.
The particles in a liquid are close together (touching) but they are able to move/slide/flow past each other.
brainliet please?
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This element has 2 fewer protons than Titanium. What element is it?
Answer:
calcium.
Explanation:
because of
thanks
Similarities and Differences in the order in which electrons are filled in s and d subshells.
Answer: Each orbital is found on different areas of the periodic table. The s sublevels are found on the first(left) and last(right) columns of the period table which hold a maximum of two electrons since it only has one orbital. First, each orbital can hold a maximum of two electrons. The other three sublevels: p, d, and f respectively have more orbitals, which is why they can hold more electrons. These sublevels of orbitals stand for sharp(s), principle(p), diffuse(d), and fundamental(f) (these are simply the categories of orbitals).
p has 3 orbitals so it can hold 6 electrons max. d has 5 orbitals so it can hold 10 electrons max. f has 7 orbitals so It can hold 14 electrons max.
Here is a picture of these orbital groups so you can understand a little better:
plz help meeeeeeeeeeeee
What are the seven most abundant elements?
Answer:
the seven most abundant elements are
oxygen
carbon
hydrogen
nitrogen
calcium
phosphorus
Explanation:
hope this helps
good luck:)
Answer:
oxygen
carbon
hydrogen
nitrogen
calcium
phosphorus
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FLINE JE PELENE BI
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SELFS EEE
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Answer:
WOWKFBBAI9AIEHEBFKCOAKQQ
What are the different parts of a comet?
Answer:
the nucleus, the coma, the ion tail, and the dust tail
Explanation:
A comet is made up of four visible parts: the nucleus, the coma, the ion tail, and the dust tail. The nucleus is a solid body typically a few kilometres in diameter and made up of a mixture of volatile ices (predominantly water ice) and silicate and organic dust particles.
Please help me with this question after I have help with my questions i will be giving away 50 points to 4 people to keep on the look out on my page xxx
Answer:
I swear I would help if I knew what the hell was going on on that picture XD
Answer:
D
Explanation:
factors like heat on mcls work on a bell curve, meaning they peak and go down
Does temperature have the same effect on gases as it does on liquids when it comes to viscosity? Explain.
When the temperature of a liquid (fluid) decreases, its viscosity increases. What happens to this fluid?
As the temperature of a liquid (fluid) increases, its viscosity decreases. What happens to this fluid?
Why does ketchup flow faster when heated?
Answer: Explanation:
With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. The gas viscosity will increase with temperature. ... With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more mobile. The attractive binding energy is reduced and therefore the viscosity is reduced.
liquids show a reduction in viscosity with increasing temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
PLS HELP!! ASAP!! 10 POINTS!!
From Dalton's atomic theory, a few parts were disproven over the course of years of experiments. Which part was modified by the discovery of subatomic particles?
That matter is made of atoms.
If the same elements are in a two different compounds, their ratio will always be the smallest whole number ratio for that compound.
That atoms cannot be divided.
That all atoms of an element are exactly the same
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. ... According to Dalton, the atoms of same element are similar in all respects. However, atoms of some elements vary in their masses and densities. These atoms of different masses are called isotopes.
Which of the following is the unit of measurement used to describe the severity of an earthquake?
Answer:
Try magnitude.
Explanation:
Answer:
The Richter scale measures the largest wiggle (amplitude)
Explanation:
The Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. ... Intensity is a measure of the shaking and damage caused by the earthquake; this value changes from location to location.
A substance is at a temperature and pressure that places it directly on the liquid-vapor equilibrium line of its phase diagram. Which phase will it become if the temperature increases while the pressure remains constant?
I WILL GIVE U BRAINLIEST
Answer: YEAH ITS the third one
Explanation: duhh
N(p+) = 12, N(n0) = 14, N(e-) = 10
Answer:
Mg[tex]^+2[/tex]
Explanation:
Es el elemento que buscas.
Which example best demonstrates stewardship of the atmosphere
Incomplete question. However, I provided a specific example of stewardship of the atmosphere.
Explanation:
First, note that the term stewardship refers to the belief that humans are obligated to take care and look after our environment (which includes the atmosphere.
An example of this is: deciding to change our mode of transportation: What this entails is that we may decide to switch to riding a bicycle to places rather than going by car. By so doing you will be reducing the number of greenhouse gases emitted into the environment as bicycles do not emit harmful gases when used.
What do you call an idea or explanation that you test through study and experimentation?
calculate the oxidation number of s in S2O8^2-
Given problem:
S₂O₈²⁻
Find the oxidation number of S;
Oxidation number presents the extent of oxidation of each atom of elements a molecular formular or formula unit or an ionic radical.
For radicals:
"the algebraic sum of all the oxidation numbers of all atoms in an ion containing more than one kind of atom is equal to the charge on the ion "
S₂O₈²⁻; oxidation number of O is usually -2
2(S) + 8(-2) = -2
2S - 16 = -2
2S = -2 + 16
2S = 14
S = +7
The oxidation state of S in the radical is +7
what are two things that affect gravity?
Answer:
When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.
Explanation:
What is the pi of 80,000 and 400000
Answer:
london I'm not dead -yet-
Explanation:
thank u for being there for me when no one else was
btw she visited me last night "I made sure to punch her in da nose but my fist hit the wall instead of her face so yea funnn" good luck in this life
you need 16.66ml (+-0.01) of 53.4 (+-0.4)wt% of NaOH with a density of 1.52 (+-0.01)g/mL to prepare 2.00L of 0.169M of NaOH. What is the uncertainty in the molarity of NaOH. FM of NaOH=39.9971 g/mol. Neglect the uncertainty in the final volume and FM.
Answer:
The absolute uncertainty is approximately 1.69 × 10⁻³
Explanation:
The volume needed for NaOH needed to make the solution = 16.66 ml
The wt% of the added NaOH = 53.4 wt%
The volume of the NaOH to be prepared = 2.00 L
The concentration of the NaOH to be prepared = 0.169 M
The molar mass of NaOH = 39.997 g/mol
Therefore, 100 g of sample contains 53.4 g of NaOH
The mass of the sample = 16.66 × 1.52 = 25.3232 g
The mass of NaOH in the sample = 0.534 × 25.3232 = 13.5225888 g ≈ 13.52 g
Therefore;
The number of moles of NaOH = 13.52/39.9971 = 0.3381 moles
Therefore, we have 0.3381 moles in 2.00L solution, which gives;
The number of moles per liter = 0.3881/2 = 0.169045 moles/liter
The molarity ≈ 0.169 M
The absolute uncertainty, u(c) is given as follows;
[tex]u(c) = \sqrt{ \left (\dfrac{0.01}{16.66} \right )^2 + \left ( \dfrac{0.4}{53.4} \right )^2 + \left ( \dfrac{0.01}{1.52} \right )^2 } \times 0.169 \approx 1.69 \times 10^{-3}[/tex]
The absolute uncertainty, u(c) ≈ 1.69 × 10⁻³.
What mass of the calcium carbonate, to the nearest hundredth of a gram, is decomposed in this reaction.
Answer:
28.00 g is the answer
Answer:200
Explanation:
It’s is the answer
Calculate number of moles in 42g of silicon.
Answer:
[tex]\frac{3}{2}[/tex]
Explanation:
No of moles : [tex]\frac{given mass}{atomic mass}[/tex]
so the given mass is 42 gm and atomic mass of silicon is 24 when u solve it u get 3/2
Is wax ionic or covalent? why?
Answer:
Candle wax will melt to a liquid and burn as a gas. Only covalent compounds can be liquid or gas!
Explanation:
Question: Is Wax Ionic Or Covalent? - Ceramicsexpandusceramics.com
In the given question, wax is a covalent compound because it is composed of nonmetal atoms that share electrons to create covalent bonds.
Covalent compounds are formed when two or more nonmetal atoms share electrons in order to achieve a stable electron configuration.
Wax is made up of long-chain hydrocarbons, which are molecules that contain only carbon and hydrogen atoms. The carbon and hydrogen atoms in these molecules share electrons to form covalent bonds.Ionic compounds, on the other hand, are formed when a metal and a nonmetal react.Therefore, wax is a covalent compound because it is made up of non-metal atoms sharing electrons to form covalent bonds.
Learn more about covalent compounds here:
https://brainly.com/question/11632372
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describe what you think will happen to a balloon that has been fully inflated and Port into a hot place explain your prediction
Answer:
Explanation:
A balloon if fully inflated and then placed close to a hot place is likely to blow. This would result from the increased air pressure inside the balloon. Increase in temperature leads to an increase in the energy of the air molecules which move at a higher speed and more collisions.May 11, 2018
The equation, reactants
product + thermal energy, describes a(n)_____
reaction.
Answer: Here you go
Explanation:
The general equation for an exothermic reaction is: Reactants → Products + Energy.
Flowering plants are the most successful group of land plants. This is due, in part, to the trait that could be the label for point C. in the cladogram. Consider the organization of the cladogram. What trait, besides flowers, is unique to this group of plants?
Answer:
seeds are protected in fruits in such kind of plants.
Explanation:
The flowering plants are also known as Angiospermae, or Magnoliophyta. Flowering plants are plants that grow flowers. Such plants use seeds to reproduce, or make more plants like them.
Seeds are protected in fruits in such kinds of plants.
Examples of flowering plants are daisies, tulips, oaks, apples.
Answer:
Seeds are protected by a fruit
Explanation: