what is the most important thing to know about the general term "discrepant event"?
Answer:
Discrepant events — demonstrations that produce unexpected outcomes — are used in science to capture students' attention and to confront their beliefs about a “phenomenon by producing an outcome which is contrary to what their previous experiences would lead them to believe is true” (Misiti, 2000, p.
The substance that dissolves the solute
A) Solubility
B) Solvent
C) Solute
Answer:
Solvent
Explanation:
Solvent dissolves solute resulting in the formation of a solution.
Answer:
B) Solvent
Explanation:
In forming a solution, the substance which dissolves the solute is called the solvent.
When the equation
_Pb2+ + Au²+ →__pb4+ + _Au
is correctly balanced using the smallest whole-number coefficients, the coefficient of Pb2+ will be
1.1
2.2
3.3
4.4
Submit Answer
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The answer is option 2 , the smallest whole-number coefficients, the coefficient of Pb²⁺ will be 2.
What is a Balanced Chemical Equation ?
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
There are two types of numbers that appear in chemical equations.
There are subscripts, which are part of the chemical formulas of the reactants and products;
and there are coefficients that are placed in front of the formulas to indicate how many molecules of that substance is used or produced.
Balance The Equation:
Pb²⁺ + Au²⁺ = Pb⁴⁺ + Au
Label Each Compound With a Variable
Label each compound with a variable to represent the unknown coefficients.
aPb²⁺ + bAu²⁺ = c Pb⁴⁺ + d Au
Create a System of Equations
Create an equation for each element where each term represents the number of atoms of the element in each reactant or product.
Pb: 2a + 0b = 4c + 0d
Au: 0a + 2b = 0c + 1d
e: 0a + -1b = -1c + 0d
2a - 4c = 0
2b - 1d = 0
-1b + 1c = 0
Solve For All Variables
Use substitution,
Substitute Coefficients and Verify Result
2Pb²⁺ + Au²⁺ = Pb⁴⁺ + 2 Au
So the answer is 2 , option 2
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What is the molarity of Na, SO, if you have 5 mol in 2.5 L?
When a solution is saturated, and additional solid solute is added, what happens?
Answer:
super saturation takes place.
what is the molarity of a solution in which 0.0142 mole of Mn2(SO4)3 is dissolved in 26ml of water
Answer:
.546 M
Explanation:
.0142 M / .026 = .546 M
A grain of sand weighs approximately 0.0102 grams. How many molecules of SiO2 are in a grain of sand? Assume that sand is 100% SiO2.
Answer:
0.5
Explanation:
mol = mass : MM SiO₂
mol = 0.0102 : 60 g/mol = 0.00017
molecules = 0.00017 x 6.02 x 10²³ = 1.0234 x 10²⁰
what is the molarity of a solution in which 0.381 moles of CuCl is dissolved in 1039ml of water
Answer:
= 0.366 M
Explanation:
data;
moles = 0.381 moles
volume = 1039ml
= 1039 / 1000
= 1.039dm^3
molarity = ?
solution
molarity = [tex]\frac{moles}{volume in dm^3}[/tex]
= 0.381 / 1.039
molarity = 0.366 M
A gas at 131.0 kPa and 28.0°C fills a flexible container with an initial volume of 2.88 L. If the temperature
is raised to 69.4°C and the pressure increased to 451.0 kPa, what is the new volume in Liters?
(Show all work)
0.837
0.723
0.952
O 0.761
Apply combine gas law
P1V1/T1=P2V2/T2131(2.88)/(273+28)=451V2/(273+69.4)131(2.88)/301=451V2/341.6V2=10.2LYou place a large pear on a scale and it shows a mass of 200 grams. What is the mass of that pear in centigrams? Remember: King Henry Doesn’t Usually Drink Chocolate Milk! 2 centigrams 20,000 centigrams 2,000 centigrams 20 centigrams
Answer:
20,000 centigrams
Explanation:
A truck tire at 82.0L at 32.5°C and 1.9 atm has a temperature change to-15.4°C and a pressure change to 770.0 mmHg. Calculate how much the volume of the
air in the tire will change.
Answer:
+ 47.68 Liter change in volume to final volume 129.68 L
Explanation:
P1V1/T1 = P2V2/T2 RE-ARRANGE TO:
P1V1/T1 * T2/P2 = V2 (T must be in Kelvin)
1.9 * 82 / (273.15 + 32.5) * (273.15-15.4)/ (770/760) = 129.68 L
129.68 - 82=47.68 L change
The concentration of an unknown protein sample was determined as 8.3 mg/ml. Calculate the concentration of the unknown protein in mM (millimolar) if: Average molecular mass of an amino acid = 118 g/mol The protein is 64 amino acids in length.
Based on the molar mass of the protein, the concentration of the unknown protein is 0.0011 mM (millimolar).
What is concentration?Concentration is the amount of a solute present in a given volume of substance.
Concentration = moles/volumeMoles of protein = mass/molar mass
molar mass of protein = 118 × 64 = 7552 g/mol
Moles of protein in 8.3 g = 8.3/7552 = 0.0011 moles
Concentration = 0.0011 mole/mL = 0.0011 mM.
Therefore, the concentration of the unknown protein is 0.0011 mM (millimolar).
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Which of the following environments are low-level areas that can be temporarily or seasonally filled with water?
Rainforest
Swamp
Tundra
Wetland
Answer:
is D :)
Explanation:
1
2
3
4
5
LO
6
7
B
8
9
10
Which functional group is found in an ester?
O=0
R R
O=0
o
с
/
R
OR'
R- OH
O
Answer:
second option
O=C-OR
R
Explanation:
ester: A compound most often formed by the condensation of an alcohol and an acid, with elimination of water. It contains the functional group C=O. joined via carbon to another oxygen atom.
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what occurs when the moon moves through Earth's shadow
Answer:
A Lunar eclipse
Explanation:
A Lunar eclipse occurs only when the sun,earth and moon are exactly aligned with earth .
This can be viewed twice in calendar years.
It's a Lunar Eclipse.
A lunar eclipse is the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon. A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
What mass of Al2O3 is formed in the reaction of 4700 kg of aluminum?
Answer in units of kg
Answer:
2350kg of Al₂O₃
Explanation:
Step 1 : Write the balanced chemical equation:
4Al + 3O₂ → 2Al₂O₃
Step 2: Find the Ratio of Al : Al₂O₃
Al : Al₂O₃
4 : 2
2 : 1
4700: 2350
= 2350kg of Al₂O₃
DIRECTIONS: Solve the following problems by using G.R.E.S.A (Given, Required,Equation, Solution, and Answer).
1. At constant temperature, the volume of a gas was found to be 500cm³ at a pressure of 760mmHg. If the pressure of the gas is doubled what will be the new volume of the gas?
Answer:
SEE BELOW
Explanation:
Given 500 cm^3 = V1 760 mm = P1 (760*2) = P2
Required V2
P1V1 = P2V2
RE-ARRANGE TO P1V1/P2 = V2
(760)(500) /(760*2) = V2
V2 = 250 ML
According to Boyles law
[tex]\\ \rm\Rrightarrow P\propto \dfrac{1}{v}[/tex]
So if pressure is increased volume will be decreased and vice versaNow pressure is doubled means multiplied by 2
The volume will be divided by two of get halved .
New volume
500/2250cm³
A sample of argon (Ar) gas has a volume of 7.31 L at a pressure of
735 mm Hg and a temperature of 45 C. Determine the volume in
liters when the temperature changes to 55 C and the pressure
changes to 325 mm Hg.
Answer:
17.1 L
Explanation:
P1V1/T1 = P2V2/T2 T is in K
P1V1/T1 * T2/P2 = V2
735 * 7.31 / (45+273.15) * (55+ 273.15)/325 = V2
V2 = 17.1 L
How many grams of LiOH are needed to make 25 mL of a 0.125 M solution?
Please explain because I have no idea how to solve this
Answer:
0.0734 grams LiOH
Explanation:
The molarity formula looks like this:
Molarity (M) = moles / volume (L)
You are given the molarity and volume (in mL). Therefore, you can plug these values into the equation and solve for moles (after you convert from mL to L).
25 mL / 1,000 = 0.025 L
0.125 M = moles / 0.025 L
(0.125 M) x (0.025 L) = moles
0.003125 = moles
After using the molarity formula, we know that 0.003125 moles LiOH are needed to satisfy these conditions. Now, we can convert this to grams using the molar mass of LiOH. This can be determined using the values from the periodic table. Remember to write your conversion in a way that allows for the units to cancel out.
Molar Mass (LiOH) = 6.941 g/mol + 16.00 g/mol + 1.008 g/mol
Molar Mass (LiOH) = 23.499 g/mol
0.003125 moles 23.499 g
------------------------ x ------------------- = 0.0734 grams LiOH
1 mole
0.074 grams of lithium hydroxide are needed to make 25 ml of 0.125 M solution, according to the concept of molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Here , in the problem mass is to be determined, hence the formula used is the first one mentioned.
Substituting values in the formula,mass=molar concentration×molar mass×volume in liters
∴0.125×23.95×0.025=0.074 g.
Hence, 0.074 g of lithium hydroxide are required to prepare 25 ml of 0.125 M solution.
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100 POINTS! HELP ME IF YOU LOVE JESUS!
A solution contains 150 g of water and 55 g of sodium chloride is at 80℃. Will all of the salt be dissolved into the water? Mathematically explain your answer.
What branch of chemistry studies the flow of electrons?
A. Inorganic chemistry
B. Electrochemistry
C. Quantum chemistry
D. Organic chemistry
Answer:
Your answer is B, Electrochemistry!
Explanation:
This is the part of chemistry that studies the chemical process in which electrons flow. This flow is called electricity. Electricity is generated by the flow of electrons, from one element to another element. This reaction is called oxidation reduction.
Answer: B
Explanation:
HCI (aq) + Ba(OH)2 (aq) →
+
-
Which of the following reactions shows a correctly balanced chemical
equation for the titration being performed?
A 2 HCl (aq) + Ba(OH)2 (aq) → BaH2 (aq) + 2 CIOH (aq)
B 2 HCl (aq) + Ba(OH)2 (aq) → BaCl2 (aq) + 2 H20 (1)
CHCl (aq) + Ba(OH)2 (aq) → BaCl (aq) + H2O2 (1)
DHCl (aq) + Ba(OH)2 (aq) → Bao (s) + H3CIO (aq)
Answer:
B. 2 HCl (aq) + Ba(OH)2 (aq) → BaCl2 (aq) + 2 H20 (1)
Explanation:
When you combine an acid and a base, the products are water (H2O), and an ionic compound, or salt.
Option B is the only one that contains an ionic compound (BaCl2) and water as the products.
7. Which is an example of a good insulator?
iron
copper
silver
rubber
Answer:
Rubber is an insulator.
Remaining three are metals and hence conductors.
How many moles of carbon are in a sample of C4H10 that also contains 200 g of hydrogen?
Select one:
O a. 80.0
O b. 800
O c. 41.6
O d. 416
e.
960.8
The number of moles of carbon in a sample of C4H10 that also contains 200 g of hydrogen is 80 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
According to this question, a sample of C4H10 was given meaning that the ratio of carbon to hydrogen is 4:10.
If 200 g of hydrogen is contained in the sample, then 200 × 4/10 = 80g of carbon is present.
no of moles of C = 80
Therefore, the number of moles of carbon in a sample of C4H10 that also contains 200 g of hydrogen is 80 moles.
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Select the correct structure that
corresponds to the name.
2,2,3-trichloro-3-fluorohexane
A.
B.
CI
CI
CI
CI
F
חד
CI
C. both
Answer:
C
Explanation:its right
The correct structure that corresponds to the name 2,2,3-trichloro-3-fluorohexane is both. Thus option C is correct.
What is chemical structure?Chemical structure is defined as the physical configuration of atoms within a molecule. The molecular geometry of the molecule is determined by its chemical structure. By illustrating how the atoms and chemical bonds are arranged in space within the molecule, chemical structure can be used to establish the molecular geometry of a product. Chemists can now see a crucial visual depiction of a chemical formula thanks to this.
2,2,3-trichloro-3-fluorohexane structure given is both are correct as one of the structure is trans form and the other is cis form of the structure. Option A is trans form while option B is cis form of structure.
Thus, the correct structure that corresponds to the name 2,2,3-trichloro-3-fluorohexane is both. Thus option C is correct.
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Name the following carboxylic acid
COOH
A. 3-ethyl-2-methylheptanoic acid
B. 2-ethyl-1-methylhexanoic acid
C. 2-methyl-3-ethylheptanoic Acid
The name of the carboxylic acid would be 2-methyl-3-ethylheptanoic acid.
Naming or carboxylic acids
Carboxylic acids are named based on the longest carbon chain and the counting starts from the carboxylic acid's functional group.
Thus, in this case, the compound would be a heptanoic acid because the longest chain towards the functional group has 7 carbons.
This means 2 branches exist in the compound. The first one has a single carbon while the second one has 2 carbon atoms. This means they are methyl and ethyl groups respectively.
The branches are located on the second and third carbon on the main chain. Thus the compound's name is 2-methyl-3-ethylheptanoic Acid.
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Help with Chemistry Thank You To Who Ever Helps Things Have Been Hard For Me.
Answer:
1.The electonic configuration of elements and their position in the periodic table are related to each other, From the electronic configuration of the elements, we can determine the period and the group to which the element belongs
Let's consider, sodium with atomic number 11 and k, l, and M shells have 2,8,and 1 electrons. since, there are 3 principal energy levels so we concluded sodium belongs to third period M Shell(valance shell) has only 1 electrons. so sodium belongs to group 1.
2. Entire D-block elements are known as Transition Elements.
3. Group 17 is the halogen group.
4. Main group of elements are...... 1,2, and 13 through 18.
5. Group 18 are the noble gas elements .
12. a). Smaller
b). Increases
c). More reactive
d). Softer
7. a). k › Ca › Ge › Br › Kr
b). Ra › Ba › Sr › Ca › Mg › Be
9. a). Ca(calcium) ion is smaller.
b). Cl(chlorine) atom is smaller.
c). Mg(magnesium) atom is smaller.
10. a). F(fluorine)
b). Sr(strontium)
c). Pb(lead)
d). At(Astatine)
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy and move farther apart. Is she correct why or why not
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy is False.
What is Freezing?This is the type of matter change which is characterized by a liquid turning into a solid.
The particles lose energy and the molecules move closer to each other which is why False was chosen.
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A substance was analyzed and found to have a pH of 3 and turn blue litmus paper to red. The substance is most likely
Which conclusion is true based on the information in this passage
Food webs are connected to each other and sensitive to any changes.
What is food web?A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
From the information given in the passage, we can conclude the following based on the meaning of food webs.
Food webs are connected to each other and sensitive to any changes.Complete question is below:
Changing one organism in a food web would not have any effect on any other food web.
It is easy to see all the ways that food webs are connected.
Food chains are always separate from each other.
Food webs are connected to each other and sensitive to any changes,
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