The student wants to test the conductivity of each solution. Prior to carrying out the investigation, the student needs to identify the variables being controlled and the variables being changed between the two solutions. Which identification of the variables is correct?
Options:
The volume of the solution and the concentration of the solution are being changed between the two solutions, but the number of solute particles is being held constant.
The number of solute particles and the concentration of the solution are being changed between the two solutions, but the volume is being held constant.
The number of solute particles is being changed between the two solutions, but the volume and concentration of the solution is being held constant.
The volume of the solution and the number of solute particles are being changed between the two solutions, but the concentration of the solution is being held constant.
Answers
Answer:b
Explanation: the particles will soon dissolve which means that the particles are changing but the volume is staying the same and the concentration is changing
The identification of the variables which is correct is that the number of solute particles is being changed between the two solutions, but the volume and concentration of the solution is being held constant.
What are variables?Variables are defined as any characteristics, number or quantity which can be measured . It can also be called as a data item . It is called as variable because they can vary and can have variety of values.
There are three types of variables 1) manipulated variable where in a condition is specified, 2) responding variable which is dependent on manipulated variable 3)controlled variable which do not change.
Example of manipulated variables are number of hours spent by a student studying , that of responding variable is result of a student and temperature is an example of controlled variable.
Learn more about variables,here:
https://brainly.com/question/17344045
#SPJ3
Related Questions
A student is dissolving sugar in water to make candy. She notices that sugar lumps are forming at the bottom of the pan. What could she do to help more of the sugar dissolve?
1. Heat the solution
2. Cool the solution
3. Add more sugar to the pan
4. Take some water out the pan
Answers
The solutes in a solvent can be make more soluble by heating. Thus upon heating the sugar lumps forming at the bottom of the water can be easily dissolved.
What is solubility?Solubility of substance is the fraction of its concentration which dissolves in a solvent. Solubility is affected by several factors such as temperature, pressure, molecular weight, bond type etc.
Water is known as universal solvent because, it can dissolve almost all the inorganic and organic compounds. The hydroxide ions in water forms hydrogen bonds with compounds and easily dissolve them.
By providing thermal energy the intermolecular attraction of the solute molecules can be weekend and they easily forms bonds with the solvent molecules results in dissolution. Thus option 1 is correct.
To refer more about solubility, find the link below:
https://brainly.com/question/8591226
#SPJ6
Neutral atoms of neon with atomic
number 10 have the same number of
electrons as
a o²+
b ca²+
c
Answers
Answer:
d. Mg²⁺
Explanation:
c. K⁺
d. Mg²⁺
Based on the Bohr's atomic model, the atom has electrons (Mass 0; Charge -1), protons (Mass 1; Charge +1) and neutrons (Mass 1; Charge 0).
The atomic number is equal to the number of protons. That means there are 10 protons. As the Neon is netural, the amount of electrons must be 10.
A neutral atom of Mg has 12 electrons, that means the Mg²⁺ has 10 electrons the same than Ne.
Right option is:
d. Mg²⁺a sample of gas X occupies 10 m^3 at a pressure of 120 kPa.if the volume of the sample is compressed to 3m^3 ,what is the new pressure of the gas?
Answers
Answer:
400 kPaExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we're finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
120 kPa = 120,000 Pa
We have
[tex]P_2 = \frac{120000 \times 10}{3} = \frac{1200000}{3} \\ = 400000[/tex]
We have the final answer as
400,000 Pa = 400 kPaHope this helps you
The following is an example of which type of boundary?
A subduction zone
B convergent boundary
C divergent boundary
D transform boundary. . also pls no links or random answes
Answers
Calculate the mass in grams of 2.56 × 10 −3 mol of iron.
Answers
Answer:
1.43 grams
Explanation:
Fe = 55.8 grams Fe = 1 mole Fe
2.56 • 10^-3 moles Fe / 1 • 55.8 grams Fe / 1 mole Fe = 1.43 grams Fe
Basically, you're just multiplying the molar mass of Fe (iron) by the moles of 2.56 • 10^-3 Fe, to find how many grams are in it.
2.56 • 10^-3 moles Fe = 1.43 grams Fe
Select the correct answer.
What effect does an increase in products have on the reaction rate of a mixture at equilibrium?
A.
The forward reaction rate increases.
B.
Both the forward and the reverse reaction rates decrease.
C.
Both the forward and the reverse reaction rates increase.
D.
The reverse reaction rate increases.
Answers
Answer:
Both the forward and the reverse reaction rates decrease.i hope I help you to day and have a good day
The speed of sound in water is 350m/s. If a sound wave has the frequency of 50Hz.
What would the wavelength of the wave be?
Answers
Answer:
Explanation
Let, Wavelength = W,
Given, frequency (f) = 50 Hz, wave velocity (V) = 342 m/s
We know, V = f × W
=> 342 = 50 × W
=> W = 342/50 metre
=> W = 6.84 metre
WILL MARK BRAINLEST
Explain one way that you could lower the amount of trash that your family produces. Be specific in your example. Explain how it will actually lead to a lower amount of trash
Answers
The total pressure is distinct from the individual partial pressures of a mixture.
A. True
B. False
Answers
Answer:
the answer is true :)
HOW DO THE STATES OF MATTER FIT INTO THE K-M THEORY? PLS NO LINKS
Answers
Answer:Matter can exist in one of three main states: solid, liquid, or gas. Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around.
Explanation:
Which explains why mixtures can be separated?
A The components have different properties.
B The components have the same properties.
C The components are always made of small particles.
D The components are always made of large particles.
Answers
Answer:
A
Explanation:
In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.
Answer:
A
Explanation:
Mixtures can be separated because the different substances have different properties
Study the map. Then use the drawing tool to create a model of how the two air masses look when they interact at front 1.
Answers
Answer: Picture
Explanation: I got it right
Answer:
2 and 3 look like a cold front in front of 1.
Explanation:
3 is an occluded front which occurs when a cold air mass devours a warm air mass and then collides with another cold mass. 2 is a warm air mass, and 1 is a cold air mass.
ILL GIVE BRAINLEST
What does the half-life of a radioisotope correspond to?
Answers
Answer:
To describe the rate at which the isotope will decay and give off radiation.
Explanation:
Which of the following is a symptom of mycoplasmosis in birds?
A. itchy rash
B. white ulcers
C. cloudy eyes
D. swollen joints
Answers
Answer:
Cloudy eyes
Explanation:
The article talks about eye infection
Which of the following is not a force
A. Weight
B. Friction
C. Acceleration
D. Air resistance
Answers
Answer:
Acceleration
Explanation:
Acceleration doesn't change one moment to the next, and therefore, doesn't count as a force.
The answer option which is not a force is: C. Acceleration.
What is a force?A force can be defined as a push or pull of an object or physical body, which typically results in a change of motion (acceleration), especially due to the interaction of the object with another.
The examples of a force.In Science, the three (3) most common examples of a force include the following:
WeightFrictionAir resistanceIn conclusion, acceleration is not an example of a force but a change in the rate of velocity of an object with respect to time.
Read more on force here: brainly.com/question/1121817
If you put 100g of NaOH in cube form and 200g of NaOH in powered form which will react with HCl at a faster rate? Explain why
Answers
Answer:
200g of NaOH in powered form will react with HCl at a faster rate
Explanation:
200g of NaOH in powered form will react with HCl at a faster rate because it is in powdered form and it will have high surface area to volume ration and hence high reactivity and rate of reaction as compared to the cube NaOH.
what were the first 25 elements that found in the earth?
answer it plz.
Answers
Answer:
Copper, Lead, Gold, Silver, Iron, Carbon, Tin, Sulfur, Mercury, Zinc, Arsenic, Bismuth, Phosphorus, Cobalt, Platinum, Nickel, Magnesium, Hydrogen, Oxygen, Nitrogen, Barium, Chlorine, Manganese, Molybdenum, Tungsten.
Explanation:
Hope This Helps :b
Answer:
Vanadium
V
Chromium
Cr
Manganese
Mn
Aluminum
Al
Silicon
Si
Phosphorus
P
Sulfur
S
Chlorine
Cl
Argon
Ar
Potassium
K
Calcium
Ca
Scandium
Sc
Titanium
Ti
Lithium
Li
Beryllium
Be
Boron
B
Carbon
C
Nitrogen
N
Oxygen
O
Fluorine
F
Neon
Ne
Sodium
Na
Magnesium
Mg
francium phosphate
+ cesium acetate
Answers
Answer:
[tex]Fe_3PO_4+3Cs(CH_3COO)\rightarrow Cs_3PO_4+3Fr(CH_3COO)[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to illustrate the complete double displacement reaction between francium phosphate and cesium acetate as given on the question:
[tex]Fe_3PO_4+Cs(CH_3COO)\rightarrow Cs_3PO_4+Fr(CH_3COO)[/tex]
Which must the balanced due to the nonequal francium and cesium atoms:
[tex]Fe_3PO_4+3Cs(CH_3COO)\rightarrow Cs_3PO_4+3Fr(CH_3COO)[/tex]
Best regards!
Using this illustration, what is the chemical formula? Picture and possible answers are below.
Answers
The answer is It is NH3.....
What is the mass of 8.23 x 10^23 atoms of Ag
Answers
Answer:
[tex]\boxed {\boxed {\sf Approximately \ 147 \ g\ Ag}}[/tex]
Explanation:
Convert Atoms to Moles
The first step is to convert atoms to moles. 1 mole of every substance has the same number of particles: 6.022 ×10²³ or Avogadro's Number. The type of particle can be different, in this case it is atoms of silver. Let's create a ratio using this information.
[tex]\frac{6.022*10^{23} \ atoms \ Ag}{1 \ mol \ Ag}[/tex]
We are trying to find the mass of 8.23 ×10²³ silver atoms, so we multiply by that number.
[tex]8.23 *10^{23} \ atoms \ Ag *\frac{6.022*10^{23} \ atoms \ Ag}{1 \ mol \ Ag}[/tex]
Flip the ratio so the atoms of silver cancel. The ratio is equivalent, but places the other value with units "atoms Ag" in the denominator.
[tex]8.23 *10^{23} \ atoms \ Ag *\frac{1 \ mol \ Ag}{6.022*10^{23} \ atoms \ Ag}[/tex]
[tex]8.23 *10^{23} *\frac{1 \ mol \ Ag}{6.022*10^{23} }[/tex]
Condense into one fraction.
[tex]\frac{8.23 *10^{23} }{6.022*10^{23} } \ mol \ Ag[/tex]
[tex]1.366655596 \ mol \ Ag[/tex]
Convert Moles to Grams
The next step is to convert the moles to grams. This uses the molar mass, which is equivalent to the atomic mass on the Periodic Table, but the units are grams per mole.
Ag: 107.868 g/molLet's make another ratio using this information.
[tex]\frac {107.868 \ g \ Ag}{1 \ mol \ ag}[/tex]
Multiply by the number of moles we calculated.
[tex]1.366655596 \ mol \ Ag*\frac {107.868 \ g \ Ag}{1 \ mol \ ag}[/tex]
The moles of silver cancel out.
[tex]1.366655596 *\frac {107.868 \ g \ Ag}{1 }[/tex]
[tex]1.366655596 * {107.868 \ g \ Ag}[/tex]
[tex]147.4184058 \ g\ Ag[/tex]
Round
The original measurement of atoms has 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.
147.4184058The 4 in the tenths place tells us to leave the 7 in the ones place.
[tex]147 \ g\ Ag[/tex]
8.23 ×10²³ silver atoms are equal to approximately 147 grams.
PLEASE HELP QUICKLY!! How many moles of NH4OH are in 0.125L of a 1.4 M solution of NH4OH?
Answers
Answer:
0.175mol
Explanation:
Molarity of a solution can be calculated thus:
Molarity (M) = number of moles (n) / volume (V)
According to the information provided in this question, volume of NH4OH = 0.125L, molarity = 1.4M
Using; Molarity = n/V
1.4 = n/0.125
n = 0.175mol
What volume of solution is required to produce a 7.8M solution containing 23.6g of LiBr?
Answers
Answer:
34.9 mL
Explanation:
First we convert 23.6 g of LiBr into moles, using its molar mass (86.845 g/mol):
23.6 g ÷ 86.845 g/mol = 0.272 mol LiBrNow we can calculate the required volume, using the definition of molarity:
Molarity = moles / litersliters = moles / Molarity0.272 mol / 7.8 M = 0.0349 LWe can convert L into mL:
0.0348 L * 1000 = 34.9 mLA catalyst increases the rate of a chemical reaction by
Lowering the heat of reaction
Increasing the activation energy
Lowering the activation energy
Changing the position of equilibrium
Answers
Answer:
Lowering the activation energy
Explanation:
A catalyst does not participate in the reaction, instead it offers the reaction an alternative pathway by lowering the activation energy. This new pathway is faster and the rate of reaction is increased.
At a fixed pressure, if the temperature is doubled, the volume of a gas will be
Answers
Answer:
Doubled.
Explanation:
The relationship between the temperature and the volume of a gas at a constant pressure can be described using Charles' law:
V₁*T₂ = V₂*T₁That means that the temperature and the volume of a gas are directly proportional: The higher the temperature, the higher the pressure. If one of those factors is increased twofold, the other one will be increased twofold as well.
Please help me out this is a test.
The imaje shows a plate baundary. Arrows have been added to indicate the movement if the plates.
Answers
Which type of ion usually undergoes reduction?
No ion
All ions
Anion
Cation
Answers
Answer:
anion
Explanation:
anion undergoes reduction.
cation undergoes oxidation.
The ions are categorized according to the process of oxidation and reduction. The ion usually undergoes reduction is an anion.
What is reduction?A process involving the partial or complete gain of electrons and loss of oxygen. The ions acquire a net negative charge on them.
Thus, anions usually undergo a reduction.
Learn more about Reduction.
https://brainly.com/question/14698511
#SPJ2
Earth's polar regions have cold, dry climates because the sun's rays are at a ?
Answers
Answer:
not reaching to the polesExplanation:
Answer:
the rays strike at a low level in the polar region
Explanation:
okay so since the polar zones lie between 66.50 north or south the polar regions are always so cold is because strike the low parts
hope this helped!
which of the following subject area contains questions that can be answered by science?
Answers
Answer:
ASTRONOMY
Explanation:
im taking that test right now
i hope this helps :0
Answer:
forensics
Explanation:
took the test yay
This diagrams represents...
a
a pure substance containing diatomic molecules
b
a pure substance containing compounds
c
a mixture containing compounds
d
a mixture of atoms
Answers
TRUE OR FALSE? what is similar about the structure of all atoms is that they all have a nucleus made up of one or more protons and neutrons. Than electrons are located outside each nucleus
Answers
Answer:
the answer is true
Explanation: