Answer:
ZnCl²=135
5H²O=23
have a great day
heterogeneous mixture homogeneous
How are they similar?
Answer:
By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers. Each of the layers is called a phase.
Explanation:
Using the ruler, what is the value of A considering significant
figures?
Answer:
13.7 cm
Explanation:
If the number is between two whole numbers then that means it is going to be a decimal, how to determine the decimal is by how many ticks/lines are between it, so if you count from 13 cm and count each line as 1 you get to the number 7 and since that number is between the whole number it becomes 13.7
Latanya brown is a nine-year old african american who is hospitalized with acute sickle cell crisis. the pharmacist is preparing intravenous fluids for this patient. she adds 2 grams of potassium chloride to 1 l of d5w/1/2 normal saline. what is the estimated osmolarity per liter (mosm/l) of this solution assuming the final volume is 1L (mw of sodium =23, potassium=39, chloride=35.5, and dextrose is 198)?
Answer:nb mhvj
Explanation:
hvvmjhv
Solid calcium oxide and gaseous water are produced by the decomposition of solid calcium oxide hydroxide. Write a balanced chemical equation for this reaction.
[tex]\boxed{\sf {Ca(OH)_2(s)\atop Calcium\:Hydroxide}\longrightarrow {CaO(s)\atop Calcium\;oxide}+{H_2O(g)\atop water}}[/tex]
On reactant side
Hydrogen= 2atomsOxygen=2atomsCalcium=1atomOn product side
Hydrogen=Oxygen=2atomsCalcium=1atom.hence balanced.
How to find out how many neutrons an isotope has
Answer:
To find the number of neutrons in an isotope, subtract the number of protons from the atomic mass of the isotope. The atomic number of the element equals the number of protons.
What is the reason for the emission of light after the gas in a discharge tube is excited?
A)
photo-electric emission
Eliminate
B)
spontaneous radioactive reaction
C)
energy jumps by electrons due to excitation
D)
high energy reaction of the gas inside the tube
Answer:
c
Explanation:
took test on usa testprep
When gas in a discharge tube is excited to higher energy level after some seconds they return to the ground level by releasing energy in the form of light. Thus energy jumps by electron due to excitation is correct option.
What is gas discharge tube?A gas discharge tube is an electronic devise containing inert gases that ionizes and conducts results in emission of light.
When a potential is applied between the electrodes in a gas discharge tube, and the pressure is reduced, the gas particles inside forms a plasma of ions.
The electrons released when excited to higher energy level by absorbing energy and returns to the initial state by emitting energy in the form of light, the discharge tube glows.
The color emitted by the discharge tube vary based on the gas in the tube. Each type of gaseous ions emit different colors.
Therefore, the light emission in gas discharge tube is due to energy hike during electron excitation and then relaxing by emitting the light energy. Thus, option c is correct.
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How many joules are equivalent to 450 calories?
Answer:
Below
Explanation:
To convert calories to joules, you need to multiply the value by 4184
450 x 4184 = 1882800 J
If your teacher requires you to round to significant figures, you would round to 2 sig figs as 450 only has 2 sig figs
450 x 4184 = 1.9 x 10^6
Hope this helps! Best of luck <3
Someone answer this tysm
Answer:
1.Fire energy.
2.Heat energy.
3.Light energy.
4.Chemical potential energy.
Hehe someone help I have put down heat but I think there is another
Answer:
chemical potential enery
Mark brainliest
calculate the volume of CO₂ at NTP occupied by 44.4g of heat
We know at NTP each gas has 22.4L of volume .
[tex]\boxed{\sf 1mol\:of\:CO_2=22.4L=44g}[/tex]
Hence 1g of CO2 contain
[tex]\\ \sf\longmapsto \dfrac{22.4}{44}[/tex]
[tex]\\ \sf\longmapsto 0.5L[/tex]
Now 44.4g of CO_2 has
[tex]\\ \sf\longmapsto 0.5\times 44.4=22.2L[/tex]
When 47.1 J of heat is added to 14.0 g of a liquid, its temperature rises by 1.80 ∘C. What is the heat capacity of the liquid?
Answer:
[tex]\boxed {\boxed {\sf 1.87 \J/g \textdegree C}}[/tex]
Explanation:
We are asked to find the specific heat capacity of a liquid. We are given the heat added, the mass, and the change in temperature, so we will use the following formula.
[tex]q= mc\Delta T[/tex]
The heat added (q) is 47.1 Joules. The mass (m) of the liquid is 14.0 grams. The specific heat (c) is unknown. The change in temperature (ΔT) is 1.80 °C.
q= 47.1 J m= 14.0 g ΔT= 1.80 °CSubstitute these values into the formula.
[tex]47.1 \ J = (14.0 \ g) * c * (1.80 \textdegree C)[/tex]
Multiply the 2 numbers in parentheses on the right side of the equation.
[tex]47.1 \ J = (14.0 \ g * 1.80 \textdegree C)*c[/tex]
[tex]47.1 \ J = (25.2 \ g*\textdegree C) *c[/tex]
We are solving for the heat capacity of the liquid, so we must isolate the variable c. It is being multiplied by 25.2 grams * degrees Celsius. The inverse operation of multiplication is division, so we divide both sides of the equation by (25.2 g * °C).
[tex]\frac {47.1 \ J}{(25.2 g *\textdegree C)} = \frac {(25.2 g *\textdegree C)*c}{{(25.2 g *\textdegree C)}}[/tex]
[tex]\frac {47.1 \ J}{(25.2 g *\textdegree C)} =c[/tex]
[tex]1.869047619 \ J/g *\textdegree C = c[/tex]
The original measurements of heat, mass, and temperature all have 3 significant figures, so our answer must have the same. For the number we found that is the hundredth place. The 9 in the thousandth place to the right tells us to round the 6 up to a 7.
[tex]1.87 \ J/ g * \textdegree C =c[/tex]
The heat capacity of the liquid is approximately 1.87 J/g°C.
13. Find the total number of atoms present in the following molecules.
a. 5 H₂O
b. Zn Cl₂
Answer:
zxcdfzdg
Explanation:
zszghzd
Which statement describes a property of a proton?
O is found outside the nucleus
O has a positive charge
O has less mass than an electron
O is repelled by electrons
Answer:
has a positive chargeExplanation:
An atom is an indivisible particle and it is composed of mainly three sub atomic particles, they are protons, electrons and neutrons. The proton has a positive charge. The correct option is B.
What are sub subatomic particles?The particles which are smaller in size than an atom are defined as the subatomic particles. The positively charged subatomic particles are called the protons whereas the negatively charged particles are called electrons and neutrons are chargeless.
It is the protons and neutrons which together make up the nucleus of an atom and hence they are called the nucleons. The number of protons or electrons in an atom is known as the atomic number and the mass of proton is 1.676 × 10⁻²⁴ grams.
It was Rutherford who discovered the protons and the charge of proton is + 1.602 × 10⁻¹⁹ Coulombs.
Thus the correct option is B.
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A popular car has a gas tank that holds a maximum of 14.5 gallons of fuel. What is
the size of the tank in liters ?
Answer:
54.883, so rougly about 54.9 liters.
Explanation:
To convert gallons to liters, multiply the amount of gallons by 3.785.
14.5 * 3.785 = 54.883
Taking into account the change of units, the size of the tank is 54.88 liters.
In first place, the rule of three is a tool used to quickly solve problems involving a proportional relationship between two variables.
The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three should be applied.
The rule of three is applied as follows, with A, B and C being known values and D being an unknown value: if A maintains a certain relationship with B, and it is known that C and D have the same relationship, it is possible to calculate the unknown value D using the following expression:
[tex]D=\frac{CxB}{A}[/tex]
In this case, the rule of three can be applied as follows: if 1 gallon is equal to 3.785 liters, 14.5 gallons are equal to how many liters?
[tex]D=\frac{14.5 gallonsx3.785 liters}{1 gallon}[/tex]
Solving:
D= 54.88 liters
In summary, the size of the tank is 54.88 liters.
Learn more with this example:
https://brainly.com/question/17839792?referrer=searchResultshttps://brainly.com/question/14586541?referrer=searchResultsHELP! 100 points if you give a valid answer and brainliest if it's detailed!
Explanation:
The extract of plant is not done in fixed proportion
it is heterogeneous
How many decigrams (dg) are in 0.779 kg?
Answer:
7790
Explanation:
Answer:
7790 decigrams
Explanation:
Which of the following best describes the make up of Saturn's rings?(1 point) solid bands of sand and dust that formed from the start of the universe solid bands of sand and dust that formed from the start of the universe material from comets that have passed through Saturn's atmosphere material from comets that have passed through Saturn's atmosphere dust, rock, and ice particles that orbit due to Saturn's gravity dust, rock, and ice particles that orbit due to Saturn's gravity debris and rocks from other planets that orbit around Saturn
Answer:
Which of the following best describes the make up of Saturn's rings?(1 point) solid bands of sand and dust that formed from the start of the universe solid bands of sand and dust that formed from the start of the universe material from comets that have passed through Saturn's atmosphere material from comets that have passed through Saturn's atmosphere dust, rock, and ice particles that orbit due to Saturn's gravity dust, rock, and ice particles that orbit due to Saturn's gravity debris and rocks from other planets that orbit around Saturn
The make up of Saturn's ring are dust, rock, and ice particles that orbit due to Saturn's gravity"
Saturn is one of the 9 planets of the solar system. It is considered to be the second largest planet.
Saturn has seven large rings orbiting around it. These rings are believed to be pieces of comets, asteroids, or shattered moons that broke up before they reached the planet. And this shattered comets or asteroid are believed to be torn apart by Saturn's powerful gravity.
These comets or asteroids are made of billions of small chunks of ice and rocks which are covered or coated with other small materials such as dust particles.
Thus, the correct option that matches the above explanation is "dust, rock, and ice particles that orbit due to Saturn's gravity"
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Describe what must be happening to the particles above as the change is happening
Answer:
d
Explanation:
solids the modicual are tightly packed
liquid, more room to move around aka not so tightly packed
gas, can move where ever it wants aka not paked at all
The following picture would be best described us
Answer:
I think its B because yeah lol but I hope you get it right
The following can be best described as a gaseous compound. The correct option is C.
What are states of matter?A state of matter is one of the various forms that matter can take in physics. In everyday life, four states of matter are visible: solid, liquid, gas, and plasma.
The elements those are gases basically at standard temperature as well as pressure are referred to as gaseous elements. The periodic table contains 11 gaseous elements.
A gas is a sample of matter that conforms to the shape of the container in which it is held and acquires a uniform density inside the container, even when gravity is present and regardless of the amount of substance in the container.
The given image depicts that the molecules of particles are at some distance from each other, this usually implies for gaseous compound.
Thus, the correct option is C.
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Bella wants to know which mode of transportation is the fastest for getting from her home to the grocery store. She can drive her car, ride her bike, walk, or charter a helicopter. What is the Independent, dependent, controlled variables and hypothesis
Answer
I think a helicopter would be fastest, just sayin.
Explanation:
What structure of the earth that cover the mantle and is the hard outer shell, the surface on which we are living.
Answer: Hello There!....................
Lithosphere
The lithosphere is the rocky outer part of the Earth. It is made up of the brittle crust and the top part of the upper mantle. The lithosphere is the coolest and most rigid part of the Earth.
Explanation:
Mark me brainest please. Hope this helps. Anna ♥
what happens when an acid dissolves
Explanation:
When an acid is dissolved in water it forms hydrogen ions (H+) that combine with water to form the hydronium ion (H3O+) .
Answer:
Acids are substances that when dissolved in water release hydrogen ions, H+(aq). ... When dissolved, bases release hydroxide ions, OH-(aq) into solution. Water is the product of an acid and base reacting. Chemists say that the acid and base cancel or neutralise each other, hence the reaction is known as "neutralisation".
Explanation:
6. How many meters are in 0.00253 kilometers?
Answer:
2.53 kilometers
How many moles of Al2O3 are contained in 45.1 g of Al2O3?
Answer:
0.44mol
Explanation:
1mol/102g=xmol/45.1g
-> x=(45.1x1)/102
x=0.44mol
This picture shows students working in a
chemistry laboratory. What could they do to make
their lab safer?
Label the test tubes and plastic cups.
Move the fire extinguisher closer to their
table.
Wear chemical protective gloves.
Reduce the clutter on the table.
Stand at the table instead of sitting. Tie long hair back.
DONE
Answer:
yes it is true they apply necessary safety measures
Answer: Label the test tubes, wear chemical protective gloves, tie long hair back
Explanation:
Just got it wrong
HELP!!
Which of the following statements best explains why oil does not dissolve in water?
A.
Polar water molecules attract each other more strongly than they attract nonpolar oil molecules.
B.
Polar water molecules attract each other less strongly than they attract nonpolar oil molecules.
C.
Water molecules and oil molecules are both polar and attract each other equally well.
D.
Water molecules and oil molecules are both nonpolar and attract each other equally well.
Answer:
A.
Explanation:
Water molecules are polar molecules and oil molecules are non polar molecules. Non polar molecules only mix well with othet polar molecules
As discussed during the lecture, the enzyme HIV-1 reverse transcriptae (HIV-RT) plays a significant role for the HIV virus and is an important drug target. Assume a concentration [E] of 2.00 µM (i.e. 2.00 x 10-6 mol/l) for HIV-RT. Two potential drug molecules, D1 and D2, were identified, which form stable complexes with the HIV-RT.
The dissociation constant of the complex ED1 formed by HIV-RT and the drug D1 is 1.00 nM (i.e. 1.00 x 10-9 mol/l). The dissociation constant of the complex ED2 formed by HIV-RT and the drug D2 is 100 nM (i.e. 1.00 x 10-7 mol/l).
1. Compute the total concentration of [D1]tot that is needed to bind 90% of the HIV-RT at the given concentration [E]tot. Provide your answer as a numerical expression with 3 significant figures in the unit mol/l. You do NOT have to consider competition betwwen the drugs D1 and D2! They are administered separately.
2. Compute the total concentration of [D2]tot that is needed to bind 90% of the HIV-RT at the given concentration [E]tot. Provide your answer as a numerical expression with 3 significant figures in the unit mol/l.You do NOT have to consider competition betwwen the drugs D1 and D2! They are administered separately.
Answer:
C)[D]/[ED] = 5.20
D)[D]/[ED] = 5.20
E)[D']_T = 1.495* 10 ^-7 M
F)[D'] / [ED'] = 0.0579
Explanation:
E = 250 nM =2.5* 10 ^-7 mol/L , T=298.15 K
Dissociation constant of K_D = 1.3 μM (1.3 *10 ^-6 M)
E + D ⇄ ED → K_a = [ED] / [D][E] (association constant)
ED ⇄ E + D → K_D = [E][D] / [ED] (dissociation constant)
C)
[E] =2.5*10^-7 mol/L
K_D = 1.3* 10^-6 M
K_D = [E][D] / [ED] → [D]/[ED] = K_D / [E]
= [D]/[ED] = 1.3* 10 ^-6 / 2.5 *10^-7
= 13/25 * 10
=130/25 = 5.20
[D]/[ED] = 5.20
D)
ΔG =RTln Kd
ΔG_2 for E and D = 1.987 * 298.15 * ln 1.3*10^-6
ΔG_2 592.454 * [ln 1.3 +ln 10^-6]
ΔG_1 = 592.424 [0.2623 - 13.8155]
ΔG_2 = -592.424 * 13.553
ΔG_1 = -8184.633 cal/ mol
ΔG_1 = -8184.633 * 4.18 J/mol = -34244.508 J?mol
ΔG_1 = -34.245 KL/mol
so, ΔG_2 = ΔG_1 - 10.5 KJ/mol
ΔG_2 = -34.245 - 10.5
ΔG_2 = -44.745KJ / mol
ΔG_2 =RT ln K_D
-44.745 *10^3
=8.314 *298.15 lnK_D
lnK_D' = - 44745 / 2478.81 g
ln K_D' = -18.051
K_D' = -18.051
K_D' = e^-18.051
[D]/[ED] = 5.20
E)
[E] = 2.5* 10 ^-7 mol/ L = a
K_D' = [E][D] / [ED'] E +D' → ED'
K_D' = a/2(x-(a/2) / (a/2)
KD' = x - a/2
=2.447 *10^-8 = (2.5/2) * 10^-7
x=2.447 * 10^-8 + 1.25 * 10^-7
x = 2.447 *10^-8 + 1.25 * 10 ^-7
x= 10^-7 [1.25 + 0.2447]
x = 1.4947 * 10^-7
[D']_T = 1.495* 10 ^-7 M
F)
K_D' = [E][D'] / [ED']
[D'] / [ED'] = KD' / [E]
[D'] / [ED'] = 1.447 *10^-8 / 2.5* 10^-7
[D'] / [ED'] = 0.5788 * 10^-1
[D'] / [ED'] = 0.0579
Explanation:
...
Someone answer this please
To convert something in kilojoules to joules, you need to:
Multiply by 1,000
1
Divide by 1,000
2
Multiply by 1,000,000 3
Divide by 1,000,000
4
Answer:
Divide by 1000
Explanation:
Have a good day
Hope I helped
Multiply by 1000 .
I HOPE IT WILL HELP YOU.
HOPE your day goes great.
If you change the number of neutrons in an atom, you will also change its -
charge
element.
o
number
d
isotope.
Calculate the maximum mass of iron that can be obtained from 240 tonnes of iron oxide
Answer:
167.86 tonnes
Explanation:.
I am assuming the iron oxide is Fe2O3 (Haematite) which is the most common form of iron oxide.
From the atomic masses:
Maximum Mass of iron = 240 * 2*55.845 / (2*55.845 + 3*15.999))
= 240 * 111.69 / (159.687)
= 167.86 tonnes
