Answer:
Explanation:
\we must convert the mass of NaCl in grams into moles. We do this by dividing by the molecular weight of NaCl (58.4 g/mole). Then, we divide the number of moles by the total solution volume to get concentration. The NaCl solution is a 0.1 M solution.
Answer:
0.125
Explanation:
boom
Please i need help with this it is Which of the following is not a property of matter that you could use to distinguish one substance from another.
Answer:
I believe it's mass? I may be wrong though...
Compute the concentration (count per volume) of vacancies in copper at room temperature if the lattice parameter of FCC copper is 0.3615 nm at room temperature (25oC, 298 K), and the activation energy to form a single vacancy is 0.9 eV. Use 8.617x10-5 eV/(atom-K), exactly, as Boltzmann's Constant.
Note: You could look up the density and atomic weight of copper to compute room temperature atom concentration you need for this problem.
Answer:
5.1044844 x 10^7/cm^3 = 5E7
Explanation:
The atomic weight and density (at 25 ° C) for copper are 63.5 g/mol or 0.0635 kg/mol and 8,960 kg/m^3
First lets find the value of N, number of atomic sites per cubic meter for copper, from its atomic weight Acu, its density, and Avogadro’s number NA
N = NA x ρ / Acu = 6.023 x 10^23 x 8,960 kg/m^3 / 0.0635 kg/mol = 8.4985953 x 10^28 atoms / m3
Temperature dependency can be given as :
Arrhenius equation
Nv = N e^(-EA/KT)
N = no. of atoms initially
Ev = activation energy
Nv = 8.4985953 x 10^28 atoms / m^3 exp^-(0.9ev/atom /8.617x10-5 eV/(atom-K) x 298 K
Nv = 5.1044844 x 10^13 /m3
vacancies per cm^3 = 5.1044844 x 10^7/cm^3 = 5E7
pls help
1. write the complete chemical symbol for the ion with 14 protons 15 neutrons and 18 electrons
2. write the complete chemical symbol for the ion with 27 protons 32 neutrons and 25 electrons
Answer:
Particle Symbol Mass
electron e- 0.0005486 amu
proton p+ 1.007276 amu
neutron no 1.008665
Cli scipattern of by
a.
inceag dryn
b.
increasinnd Midwest.
Answer:
the answer is A don't put b Coz b is incorrect
Can the following reaction occur? Why?
Cl2 + Mg 2 - 12 + MgCl2
Answer:
yes
Magnesium (Mg) combines with chlorine (Cl2) to form a new product as magnesium chloride (MgCl2). Therfore its a combination reaction and the balanced equation can be written as: Mg(s)+Cl2(g)→MgCl2(s)
. A 300 kg Blue car is moving rightward at 3 m/s, about to collide with a 100 kg Red car. Adjust the
velocity of the Red car so that the total momentum of the system is 800 kg m/s. (Adjust the velocity
of the Red car so that the sum of the momentum of the Blue car and the momentum of the Red car
equal 800 kg m/s.) What happened?
Answer:
The velocity of the red car is 1 m/s.
Explanation:
Given that,
The mass of blue car, m₁ = 300 kg
The mass of red car, m₂ = 100 kg
The velocity of Blue car, v₁ = 300 kg
The total momentum of the system, p = 800 kg-m/s
The momentum of an object is given by :
p = mv
So,
[tex]m_1v_1+m_2v_2=p[/tex]
Where
v₂ is the velocity of red car. So,
[tex]v_2=\dfrac{p-m_1v_1}{m_2}\\\\v_2=\dfrac{800-300\times 3}{100}\\\\v_2=-1\ m/s[/tex]
So, the velocity of the red car is 1 m/s.
Which is considered a fruit?
acorn
squash
orange
beet
carrot
Answer:
an orange would be considered a fruit
Explanation:
fruits have seeds while vegetables do not
To make a solution for an experiment, Gunther needs to add 40 g of a solute to 100 g of water. When making the solution at room temperature, he could only add 34 grams before the solute settled out.
What could he do to dissolve the remaining 6 grams of the solute?
Answer:
B. Heat the solution, dissolve the solute, and let the solution cool verifying nothing settled out.
Explanation:
To dissolve more solute, the solution has been heated at a high temperature, and the cooling has been observed to verify proper dissolution.
The solubility of the compound has been the ability of the solvent to dissolve the solute molecules. For the solution formation, the intermolecular forces between the solute molecules have been broken in order to sustain the interaction between the solute and the solvent molecules,
The interaction between solute and solvent molecules results in the dissolution of the solute in the solvent.
When Gunther dissolves the 34 grams, of solute, the energy of the solvent molecules has been enough to break the solute interactions and dissolve the solute molecules.
However, in order to dissolve more molecules, the solvent molecules are provided with the energy that has been able to increase the kinetic energy of the solvent for the dissolution of more solute.
The kinetic energy of the solvent has been increased with the increase in the temperature, thereby adding to the more dissolution of the solute.
Thus, to dissolve more solute in the solvent, the solution has been heated at a high temperature, and the cooling has been observed to verify the absence of precipitate thereby proper dissolution.
For more information about the dissolution of solute into solvent, refer to the link:
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Which of these outcomes is a positive effect of ecotourism on the
environment?
A. Ecotourism can harm delicate ecosystems.
O B. Ecotourism takes money away from conservation.
C. Ecotourism can exploit local peoples and increase crime.
D. Ecotourism helps pay for conservation efforts.
Answer: D- ecotourism helps pay for conservation efforts
Explanation:
says help and the others exploit and harm
[tex] \sf { \fcolorbox{green}{g}{What is \: the diffrence between alkali and base in simple defination}} [/tex]
Answer:
All alkalies are bases but all bases are not alkaliesall alkalies are soluble in water but all bases are not alkalies .hope it is helpful to you
Answer:
[tex] \sf { \fcolorbox{green}{g}{\: the diffrence between alkali and base in simple defination are:}} [/tex]
[tex] \sf { \fcolorbox{green}{g}{\:All alkalies are bases but all bases are not alkalies }} [/tex][tex] \sf { \fcolorbox{green}{g}{\:all alkalies are soluble in water but all bases are not alkalies. }} [/tex]matching will give brainliest. if you can answer any it help
1. element with atomic number greater than 92.
2. helium nucleus with and atomic number or 2 and a mass of 4.
3. unit for measuring exposure to radiation.
4. changing of one element to another due to alpha or beta decay.
5. caused by the decay of an electron.
6. atoms of the same element with different numbers of neutron.
7. the initial isotope before decay.
a. rem
b. alpha particle
c. beta particle
d. trans uranium element
e. transmutation
f. isotope
g. parent nuclide
Explanation:
In natural radioactive decay, three common emissions occur. When these emissions were originally observed, scientists were unable to identify them as some already known particles and so named them:
alpha particles ( α )
beta particles (β)
gamma rays (γ)
These particles were named using the first three letters of the Greek alphabet. Some later time, alpha particles were identified as helium-4 nuclei, beta particles were identified as electrons, and gamma rays as a form of electromagnetic radiation like x-rays, except much higher in energy and even more dangerous to living systems.
What's the most unreactive metal?
Answer:
gold and platinum
Explanation:
Very unreactive metals, such as gold and platinum, are found in the Earth's crust as pure metals. These are called native metals.
2 attempts len
Check my work
The density of sucrose, table sugar, is 1.56 g/ec. What volume (in cubic centimeters) does 19.0 g of
sucrose occupy?
cc
Answer:
12.18 cc
Explanation:
From the question given above, the following data were obtained:
Density = 1.56 g/cc
Mass = 19 g
Volume =?
The density of a substance can be defined as the mass per unit volume of the substance. Mathematically, it can be expressed as:
Density = mass / volume
With the above formula, we can obtain the volume of the sucrose as follow:
Density = 1.56 g/cc
Mass = 19 g
Volume =?
Density = mass / volume
1.56 = 19 / volume
Cross multiply
1.56 × volume = 19
Divide both side by 1.56
Volume = 19 / 1.56
Volume = 12.18 cc
Therefore, the volume occupied by the sucrose is 12.18 cc
A student is conducting molecular weight determination of an unknown diprotic acid. He first prepared a 250 mL of 0.15 M NaOH (39.997 g/mol) titrant solution, which he then standardized with 0.7625 g of KHP (204.22 g/mol) which consumed 26.32 mL of the titrant. After standardization, he weighed 0.0996 g of unknown diprotic acid and the titration reached the endpoint at a volume of 11.68 mL. What is the standardized concentration of titrant?
Answer:
0.0710
Explanation:
Basedon the data provided, the concentration of the standardized titrant is 0.142 M.
What is a standard solution?A standard solution is a solution of known concentration.
The concentration of the standardized titrant is calculated from the mole of KHP required.
Moles of KHP = 0.7625 g/ 204.22 g/mol
Moles of KHP = 0.00373 mol
Mole ratio of KHP and NaOH is determined from the equation of the reaction below:
NaOH + KHP → KNaP + H2OMole ratio is 1:1Therefore, moles of NaOH = 0.00373 moles
Molarity of a NaOH = moles/volume in L
volume of titrant = 26.32 mL = 0.02632 L
Molarity of NaOH = 0.00373/0.02632
Molarity of NaOH = 0.142 M
Therefore, the concentration of the standardized titrant is 0.142 M.
Learn more about standard solution at: https://brainly.com/question/24549357
Name two elements, compounds and mixtures that are essential for living organisms. Also write why are they essential?
elements:
calcium : for strong bones
Iron : maintaining haemoglobin for metabolism
compunds
sodium chloride : to maintain blood pressure and other life processes
Adenosine Triphosphate: for metabolism, to maintain rate of inhalation and exhalation of oxygen and to supply energy
Mixture:
I) gasoline : used as fuel
ii) cement : used in construction
Answer:
Elements-
Oxygen is essential for living organisms to survive. Carbon dioxide is essential for the survival, growth and reproduction of living things. Plants obtain carbon from the atmosphere in the form of carbon dioxide, which they need for photosynthesis. They convert inorganic carbon into organic carbon in the form of sugar and starch, which they add to their tissues.Compounds-
Water is essential for living organisms to stay hydrated.Carbohydrate and protein- These compound are used to form new cells and tissues and to repair.Mixtures-
Blood is very much important for the transportation of oxygen in living organisms.Blood plasma is an example of a homogeneous mixture. This is a colourless fluid that holds the blood cells in suspension. It makes up a little more than half of the volume of human blood.If cobalt is emitting radiation but there is no change in its atomic number, what type of radiation is being emitted? A. Gamma B. Beta C. Delta D. Alpha
Answer:
(A) Gamma
Explanation:
They are emitted during radioactive decay and have no mass and no electrical charge meaning no change in atomic number or mass number.
Hope it helps :)
Answer:
A. Gamma
Explanation:
Answers Via Educere/Founders Education.
What is the final temperature of the metal?
What is the temperature change of the water?
What is the temperature change of the metal?
"C
Answer:
1. The final temperature of the metal is 111 °C.
2. The change in the temperature of the water is 6.2 °C
3. The change in the temperature of the metal is 40.6 °C.
Explanation:
From the question given above, the following data were obtained:
Initial temperature of metal (Tₘ₁) = 70.4 °C
Initial temperature of water (Tᵥᵥ₁) = 23.6 °C
Equilibrium temperature (Tₑ) = 29.8 °C
1. Determination of the final temperature of metal.
We'll begin by calculating the change in temperature of the metal. This can be obtained as follow:
Initial temperature of metal (Tₘ₁) = 70.4 °C
Equilibrium temperature (Tₑ) = 29.8 °C
Change in temperature of metal (ΔTₘ) =?
ΔTₘ = Tₘ₁ – Tₑ
ΔTₘ = 70.4 – 29.8
ΔTₘ = 40.6 °C
Finally, we shall determine the final temperature of the metal. This can be obtained as follow:
Initial temperature of metal (Tₘ₁) = 70.4 °C
Change in temperature of water (ΔTₘ) = 40.6 °C
Final temperature of metal (Tₘ₂) =?
40.6 = Tₘ₂ – 70.4
Collect like terms
40.6 + 70.4 = Tₘ₂
111 = Tₘ₂
Tₘ₂ = 111 °C
Thus, the final temperature of the metal is 111 °C
2. Determination of the change in the temperature of the water.
Initial temperature of water (Tᵥᵥ₁) = 23.6 °C
Equilibrium temperature (Tₑ) = 29.8 °C
Change in temperature of water (ΔTᵥᵥ) =?
ΔTᵥᵥ = Tₑ – Tᵥᵥ₁
ΔTᵥᵥ = 29.8 – 23.6
ΔTᵥᵥ = 6.2 °C
Therefore, the change in the temperature of the water is 6.2 °C
3. Determination of the change in the temperature of the metal.
The change in the temperature of the metal is 40.6 °C.
Please solution 1 above for explanation.
Answer:
29.8 C
6.2 C
-40.6 C
:)
Explanation:
How can heat change matter from a solid to a liquid to a gas?
Help ima mark Brainlyest!!
When applying heat the solid will eventually reach its melting point. Its then that the solid will slowly start to turn into a liquid due to the heat transfer. The process will only continue with even more heat piling up causing it to evaporate and become a gas.
Heat transfer comes in different ways depending on the solid:
either-
| | |
conduction
convection
or
radiation
- - - - -
this is all I know for now.
-------------------------------------------
Lucky me! We actually learned this in class today
I hope I helped in some way! :)
What is the pH of a 4.5 x 10 M HI solution?
Answer:
ik ppl sy no links but https://courses.lumenlearning.com/cheminter/chapter/the-ph-scale/
Explanation: it should help you
how does salinity differ in a river, estuary, and an ocean?
Answer:
Because fresh water flowing into the estuary is less salty and less dense than water from the ocean, it often floats on top of the heavier seawater. ... For example, a heavy spring rain, or a sustained shift in local winds, can drastically affect the salinity in different parts of an estuary.
Answer:
Because fresh water flowing into the estuary is less salty and less dense than water from the ocean, it often floats on top of the heavier seawater.For example, a heavy spring rain, or a sustained shift in local winds, can drastically affect the salinity in different parts of an estuaryWhat is the percent composition of a copper chloride compound if a 269 g sample contains 127 g of copper and 142 grams of chlorine.
Answer:
Explanation:
The whole sample is 269
%copper = 127/269 * 100 = 47.2%
%chlorine = 142/269 * 100 = 52.8%
That's all you are asking. Is there more?
What do the observations for changes to volume and pressure show you about the
relationship between the volume and pressure of a gas? Explain using the data! Does
this demonstration support Boyle's Law or not?
(Hint: pressure is not being measured in this video, but think what would happen to a
balloon if it was squeezed or compressed. Would it get larger or smaller?)
Answer: The given demonstration does not support Boyle's Law.
Explanation:
According to Boyle's law, at constant temperature the pressure of an ideal gas is inversely proportional to the volume of gas.
[tex]P \propto \frac{1}{V}[/tex]
Therefore, an increase in volume of gas will lead to a decrease in pressure and vice-versa.
Now, according to the given data of volumes there is occurring an increase on moving from final volume 1 to final volume 3. This means that pressure is decreasing.
As a result, if a balloon was squeezed or compressed then it would get smaller. But in the given demonstration pressure is not given.
Thus, we can conclude that the given demonstration does not support Boyle's Law.
Nitrogen is important for _____. plant growth weather and temperature animals to breathe photosynthesis
Answer:
building amino acids in proteins
Explanation:
Lisa has a glass that has a mass of exactly 100 grams. She puts exactly 45 grams of acid in the glass, and then she adds 15 grams of crushed limestone. When the limestone touches the acid, it makes bubbles. Lisa waits until the reaction stops, and then she weighs the glass and its contents. What should Lisa expect to find about the mass of the glass and its contents when she puts it on a scale?
Answer:
She should expect for the scale to say 145 grams.
Explanation:
Limestone is mostly made up of the mineral calcium carbonate (CaCO3). But if you add an acid, you add hydrogen ions (H+), which will react with the carbonate to form hydrogen carbonate HCO3- ions, which are very soluble in water, and the limestone will dissolve. So, if you add 100+45 you get 145.
9. a) What is an isotope?
Answer:
Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element. Hope this helps, have a good day! :)
Answer:
atoms with the same number of protons and electrons but different numbers of neutrons
Explanation:
how many moles of hydrogen fluoride to make 16 moles of hydrogen
Answer: You can view more details on each measurement unit:
Explanation:
molecular weight of Hydrogen Fluoride or mol The molecular formula for Hydrogen Fluoride is HF. The SI base unit for amount of substance is the mole. 1 grams Hydrogen Fluoride is equal to 0.049984147027929 mole.
In carbonated water, when carbon dioxide bubbles are
thoroughly mixed into the water, they become invisible. What
type of mixture is carbonated water?
a solution
b compound
C colloid
d suspension
Answer: IT’S SOLUTION!!
Explanation:
I’m taking ck-12
The carbonated water is a type of solution. The correct option is a.
What is a solution?A solution is a uniform mixture of one or more dissolved solutes in a solvent.
A solvent is a substance that dissolves a solute to produce a homogeneous mixture. The substance that dissolves in a solvent to form a homogeneous mixture is referred to as a solute.
Because carbonated water is a mixture, it contains two or more different chemicals. Carbonated water is made up of both water and carbon dioxide.
The amount of each ingredient in carbonated beverages is fixed. All of the components, such as sweetener, water, and carbon dioxide bubbles, are distributed evenly. Homogenous mixtures are those in which the amount of each component is uniform.
Thus, as in carbonated water, when carbon dioxide bubbles are thoroughly mixed into the water, they become invisible, it can be considered as solution, means option a is correct.
For more details regarding solution, visit:
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please help me! ASAP
Answer:
(1) 4- ethyl -6 methyl -2 octyne
which statements describe what happen in a redox reaction?
a. one atom gains electrons and one loses electrons
b. the cations on two substances trade places
c. electrons move from one substance to another
d. there are two oxidation reactions
Answer:
A or C
Explanation:
I don't know if I'm correct but I think it's A or C you don't have to choose them.
How many moles are in 18.3 grams of Carbon?
Answer:
1.5236414197340638