Answer:
Concentration AgBr at saturation = 7.07 x 10⁻⁷M
Explanation:
Given AgBr(s) => Ag⁺(aq) + Br⁻(aq) ; Ksp = 5 x 10⁻¹³ = [Ag⁺][Br⁻]
I --- 0 0
C --- +x +x
E --- x x
[Ag⁺][Br⁻] = (x)(x) = x² = 5 x 10⁻¹³ => x = SqrRt(5 x 10⁻¹³) = 7.07 x 10⁻⁷M
Michelle learns in science class that simple machines such as an inclined plane can change the amount of force needed to lift heavy objects. She decides to test this with an experiment.
Michelle chooses a 10 kg weight. She sets up a ramp made of smooth metal that makes an angle θ with the floor. She attaches a spring scale to the weight and the top of the ramp in order to hold the weight in place. She records the force from the spring scale, then changes θ and records it again. She repeats this several times.
In this experiment, what is the outcome variable (dependent variable)?
A.
the angle θ between the ramp and the ground
B.
the mass of the weight
C.
the material the ramp is made of
D.
the amount of force on the spring scale
PLEASE I NEED HELP ON THIS RN AND IT'S DUE TODAY!!!!!!!!
IF YOU POST ANY LINKS THAT ARE PERM-BLOCKED, I WILL REPORT YOU, TAKE YOUR POINTS AWAY, DELETE YOUR ANSWER, AND PROBABLY BAN YOU! IF YOU DO NOT KNOW, DON'T ANSWER!!!!!!!
Answer: the amount of force on the spring scale
Explanation:
In the set up below, which air should show an increase in temperature?
Answer:
My guess is A.
Explanation:
the volume of alcohol present in 409ml of 11%
Answer:
Amount of Alcohol volume present in solution = 44.99 ml
Explanation:
Given:
Total volume of solution = 409 ml
Amount of Alcohol percentage present in solution = 11%
Find:
Amount of Alcohol volume present in solution
Computation:
Amount of Alcohol volume present in solution = Total volume of solution x Amount of Alcohol percentage present in solution
Amount of Alcohol volume present in solution = 409 x 11%
Amount of Alcohol volume present in solution = 409 x 0.11
Amount of Alcohol volume present in solution = 44.99 ml
1.1.2 Differentiate between a micro and macro mineral element,
Explanation:
Macro minerals are present at larger level in the animal body or required in large amount in the diet. Such as calcium, chlorine, magnesium, potassium, sulphur, and sulfur.Micro minerals are often referred to as trace minerals i.e; they are present at low levels in the body and required in smaller amounts in the animal diet. Such as zinc, iron, iodine, cobalt, copper, flurion, etc.2. Which answer is NOT the definition for one of these terms: volcano,
lava, magma?
O a crack or fracture in the Earth's crust where movement occurs
molten rock stored beneath Earth's surface
magma that erupts on Earth's surface
vents in Earth's crust through which molten rock flows
Find the number of moles in 1.00 x 1023 atoms of chromium.
Answer:
0.17 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.00 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1}{6.02} \\ = 0.166112[/tex]
We have the final answer as
0.17 molesHope this helps you
Life cycles are:
random
divided into two stages
predictable
exactly the same for all species
10 examples of salt in chemistry
Answer:
nacl cacl kcl mgcl k2so4 na2co3 na2so4 kno3 nahco3 naco3
Explanation:
I need help, I just need someone to answer the question today or tomorrow!
Answer:first one is carbon
Explanation:
Other than that I don’t know
Convert 25 g CO2 to moles CO2
Solution (a) has a hydrogen ion concentration of 2.7 x 10^-3 and solution (b) has a hydrogen ion concentration of 4.1 M. What are their pH and say if they are acids or bases.
Answer: a) pH = 2.56 , acidic
b) pH = 2.38, acidic
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
a) [tex][H^+]=2.7\times 10^{-3}[/tex]
Putting in the values:
[tex]pH=-\log[2.7\times 10^{-3}][/tex]
[tex]pH=2.56[/tex]
Thus as pH is less than 7, the solution is acidic.
b) [tex][H^+]=4.1\times 10^{-3}[/tex]
Putting in the values:
[tex]pH=-\log[4.1\times 10^{-3}][/tex]
[tex]pH=2.38[/tex]
Thus as pH is less than 7, the solution is acidic.
Molecular geometry of AX2E
Answer:
This molecule is made up of 3 equally spaced sp2 hybrid orbitals arranged at approximately 120o angles. The shape of the orbitals is planar triangular. One orbital contains a lone pair of electrons.
Earth's atmosphere mainly gives off (radiates) which form of energy?
Answer:
infrared energy
Explanation:
4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g) Using the balanced equation calculate the mass of N2 produced from 100 grams of NH3 racing with an unlimited supply of NO.
Here's link to the answer:
bit.[tex]^{}[/tex]ly/3a8Nt8n
In which state of matter does an object have a fixed volume and a fixed shape?
Need ASAP
What is the mass of NaCl required to make 160 grams of a 32% solution of NaCl in water?
Answer: 19.20 g. Explanation: ∵ mass % = [mass of solute/mass of solution] x 100.Apr 30, 2019
Explanation: I don't know if this helped but uh yeah.
You are given a stock solution of 500.0 mL of 1.00M magnesium chloride solution. Calculate the volume of the stock solution you would need to use to prepare 250.0 mL of 0.20 M solution.
Answer:
[tex]50\; \rm mL[/tex] of the stock solution would be required.
Explanation:
Assume that a solution of volume [tex]V[/tex] contains a solute with a concentration of [tex]c[/tex]. The quantity [tex]n[/tex] of that solute in this solution would be:
[tex]n = c \cdot V[/tex].
For the solution that needs to be prepared, [tex]c = 0.20\; \rm M = 0.20\; \rm mol \cdot L^{-1}[/tex]. The volume of this solution is [tex]V = 250.0\; \rm mL[/tex]. Calculate the quantity of the solute (magnesium chloride) in the required solution:
[tex]\begin{aligned}n &= c \cdot V \\ &= 0.20\; \rm mol \cdot L^{-1} \times 250.0\; \rm mL \\ &= 0.20\; \rm mol \cdot L^{-1} \times 0.2500\; \rm L \\ &= 0.050\; \rm mol\end{aligned}[/tex].
Rearrange the equation [tex]n = c \cdot V[/tex] to find an expression of volume [tex]V[/tex], given the concentration [tex]c[/tex] and quantity [tex]n[/tex] of the solute:
[tex]\displaystyle V= \frac{n}{c}[/tex].
Concentration of the solute in the stock solution: [tex]c(\text{stock}) = 1.00\; \rm M = 1.00\; \rm mol \cdot L^{-1}[/tex].
Quantity of the solute required: [tex]n = 0.050\; \rm mol[/tex].
Calculate the volume of the stock solution that would contain the required [tex]n = 0.050\; \rm mol[/tex] of the magnesium chloride solute:
[tex]\begin{aligned}& V(\text{stock}) \\ &= \frac{n}{c(\text{stock})} \\ &= \frac{0.050\; \rm mol}{1.00\; \rm mol \cdot L^{-1}} \\ &= 0.050\; \rm L \\ &= 50\; \rm mL\end{aligned}[/tex].
Aluminum reacts with chlorine gas to form aluminum chloride according to the reaction below.
2 Al(s)
+
3 Cl2 (g)
2 AlCl3 (s)
How many moles of aluminum chloride can be produced from 2.12 L of chlorine gas at a
temperature of 24 °C and a pressure of 2.27 atm?
Answer:
0.131mol
Explanation:
Firstly, we need to find the number of moles of chlorine gas (Cl2) by using the formula:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas constant (0.0821 Latm/molK)
T = temperature (K)
Using PV = nRT
n of Chlorine = PV/RT
Based on the information provided in this question, V = 2.12 L, P = 2.27atm, T = 24°C = 24 + 273 = 297K
n = 2.27 × 2.12/ 0.0821 × 297
n = 4.8124/24.3837
n = 0.197
number of moles of Chlorine gas = 0.197mol
The balanced chemical equation provided in this question is as follows;
2 Al(s) + 3Cl2 (g) → 2AlCl3 (s)
3 moles of Cl2 produce 2 moles of AlCl3
0.197moles of Cl2 will produce;
0.197 × 2/3
= 0.394/3
= 0.131mol of AlCl3.
12 Mixture 1 contains sand and water
Mixture 2 contains salt and water
Which method of separation could be used to obtain each of the required products from each
mixture?
mixture 2
10 ottain sand
to obtam water
to obtain salt
to obtain water
crystalisation
distillation
filtration
fiftration
B
crystalisation
filtration
fitration
distillation
Ty tallation
Crystallisation
Answer:
B i tyink
Explanation:
brainlyest plssss
To obtain sand and water from mixture 1 , filtration process will be used.
To obtain salt from water in mixture 2 , crystallisation will be done.
What is physical treatment process?Physical wastewater treatment processes include use of racks, screens, clarifiers (sedimentation and flotation), and filtration. Chemical or biological reactions are important treatment processes, but not part of a physical treatment process.
It is given that the mixture contains
Mixture 1 contains sand and water
Mixture 2 contains salt and water
To obtain sand and water from mixture 1 , filtration process will be used.
To obtain salt from water in mixture 2 , crystallisation will be done.
To know more about Physical Treatment Process
https://brainly.com/question/23858244
#SPJ2
Rank the following elements by decreasing metallic character: Cesium (C's), Bromine (Br), Osmium (Os), Tin (Sn)
Answer:
Cs, Os, Sn, Br
Explanation:
Metallic character increases to the left and down the periodic table.
What is the correct formula for the compound made of magnesium and nitrogen
Answer:
Mg3N2
Explanation:
it has an inorganic compound for Magnesium and Nitrogen. if you put this two together it will the compound Magnesium nitride.
d. 2 5. How many moles of HCl are needed to produce 25 moles of KCl in the presence of excess potassium permanganate? a. 16 b. 32 c. 5 d. 200
Answer:
d. 200.
Explanation:
The reaction is:
2KMnO4 + 16HCl ----> 2KCl + 2MnCl2 + 8H2O + 5Cl2
So 2 moles of KCL are produced form 16 moles of HCL
So 25 moles KCL are made from 25 * (16/2) HCl.
= 25 * 8
= 200 moles. HCl.
explain why hydrogen molecules can form on earth but do not exist as a star explode
Answer:
hey!
Explanation:
Hydrogen is the abundant in the Sun and in the large outer planets and hydrogen is the most abundant element in the universe as a whole, so at first sight it may seem strange that there is no significant gaseous hydrogen in earth’s atmosphere.
Hydrogen molecules can form on earth but do not exist as a star explode because because it's a very low density gas.
A molecule of hydrogen is made up of two hydrogen atoms. A molecule of hydrogen has two protons as well as two electrons which are being held by electrostatic forces.It should be noted that when hydrogen molecules in the atmosphere reach the top, the cosmic rays energizes them which leads to the fast movement which enables them to escape from the Earth's gravity. This is the reason for the significant percentage of the hydrogen gas that we've in the atmosphere.On the other hand, the gravitational pull is stronger for the gas giants. Also, they are colder than Earth, therefore the hydrogen molecules will be less energetic in such condition. Therefore, hydrogen molecules do not usually exist as a star explode.Read related link on:
https://brainly.com/question/20986803
3. Look at the reaction below:
H2O + C —— CO+ H2
AH = +130kJ mol^-1
Explain what happens to the position of equilibrium if we:
a. increase the pressure
b. increase the concentration of hydrogen gas
c. increase the temperature
d. add a catalyst
Explanation:
a. pressure always favors the side with fewer molecules. in this reaction as both the sides have equal number of molecules, there won't be any change in the position of the equilibrium.
b. when the concentration of the hydrogen gas is increased. more particles would take place in the reaction and so, the rate of reaction would increase favoring the reaction concerning hydrogen gas molecules (backward reaction in this case) therefore, equilibrium would shift to the backward reaction (left).
c. as forward reaction is endothermic, when temperature is increased the equilibrium will shift to the forward reaction (right).
d. catalyst would not have any effect on the position of the equilibrium. it will only increase the rate of reaction.
hope it helps. :)
2) What is the mass of a sample that produces -1,500 J if the specific heat is 1.0 and the temperature decreases by 30℃?
3) What is the specific heat (C) of silver if we heat a 16g cube from 45 oC to 80 oC and it absorbs 41.3 J of thermal energy?
Answer:
(2) 50 kg
(3) 73.75 J/kg.K
Explanation:
(2) From the question,
Using,
q = mcΔt........................ Equation 1
Where q = amount of heat, m = mass. c = specific heat capacity, Δt = change in temperature
make m the subject of the equation
m = q/(cΔt)..................... Equation 2
Given: q = 1.500 J, c = 1.0 J/kg.K, Δt = 30°C
substitute these values into equation 2
m = 1500/(1×30)
m = 50 kg
(3) using
q = cm(t₂-t₁).
Where t₁ and t₂ = initial and final temperature respectively
making c the subject
c = q/m(t₂-t₁)................ Equation 3
Given: q = 41.3 J, m = 16 g = 0.016 kg, t₂ = 80°C, t₁ = 45°C
Substitute these values into equation 3
c = 41.3/0.016(80-45)
c = 41.3/0.56
c = 73.75 J/kg.K
Which of the following has the highest induced dipole interactions in its molecule?
a. He
b. Ar
c. Ne
d. Kr
Answer:
Option A
Explanation:
In Dipole -induced dipole forces/interactions a polar and a non polar molecule group together to form a bond.
The higher is the electronegativity, the higher is the Dipole-Induce dipole.
As electronegativity defines the ability of an atom to attract a pair of electron in any chemical bond.
The smaller the atom, the higher is the electronegativity and hence the higher is the Dipole -induced dipole forces/interactions
Option A
On a job application how should you list the schools you attended
Answer:
Usually, you should lay down your educational background by listing the most recent or advanced degree first, working in reverse chronological order. But there are exceptions. Say you earned a degree in geography, but are now working in the field of online marketing. If you more recently completed coursework specific to social media or digital marketing, list that first to grab the reviewer’s attention.
Explanation:
Answer:
Start with the most recent or advanced degree first, working in reverse chronological order.
Explanation:
please help!
Which of the following will an Arrhenius base always produce?
A) H2
B)H2O
C)H+
D)OH-
Answer: D. OH- (Edmentum)
Explanation: Took the test and got it right!
12. Label Each part of the atom:
Answer:
Atom Labeling
Explanation:
Y- neutron
Z-protron
X - electron
W- nucleus
what is unique about an elements structure?
Explanation:
Atomic Number and MassEach element has its own unique properties. Each contains a different number of protons and neutrons, giving it its own atomic number and mass number. The atomic number of an element is equal to the number of protons that element contains.