After heating the crucible, cooling, and weighing the sample as 0.739 g, the students should have heated the crucible again and then reweigh the sample until a constant weight is obtained.
Drying samples with cruciblesThe sample being heated, CaCl2 2 H2O, contains water of hydration.
In order to arrive at an anhydrous sample of the salt, all the water molecules must be completely evaporated off by heating.
To do so, the sample should have been heated to constant weight by repeated heating and weighing until there is no longer a change in the weight of the sample.
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2.0 L of Carbon dioxide is heated from -25.0 °C to Standard Temperature.
What is the final volume of the gas?
The final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L.
How to calculate volume?The volume of a given gas can be calculated using the Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volumeV2 = final volumeT1 = initial temperatureT2 = final temperatureV1 = 2LV2 = ?T1 = -25°C + 273 = 248KT2 = 273K2/248 = V2/273
273 × 2 = 248V2
546 = 248V2
V2 = 546/248
V2 = 2.2L
Therefore, the final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L
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what does SPDF Blocks represent on the periodic table?
Answer:
SPDF blocks represents the last electron of particular element entering into valance subshell.
example: oxygen is p block element because (1s2, 2s2 2p4) its last electron is in p block
A block of the periodic table is unified by the atomic orbitals in which valence electrons lie in.
What is the block in the periodic table?A block can be described as a set of elements in which the valence electrons lie in atomic orbitals. Each block in the periodic table is named after its characteristic orbital: s-block, p-block, d-block, and f-block.
The block names (s, p, d, and f) are derived from the value of an electron's azimuthal quantum number: sharp (0), principal (1), diffuse (2), and fundamental (3).
The s-block, where 's' stands for "sharp" and azimuthal quantum number 0, is on the left side of the periodic table. The p-block, where 'p' stands for "principal" and azimuthal quantum number 1, is on the right side of the modern periodic table and elements in groups 13 to 18.
The d-block, where 'd' stands for "diffuse" and azimuthal quantum number 2, is in the middle of the periodic table and elements from groups 3 to 12.
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Which one of the following pairs of atoms would form a non-polar covalent bond?
a. Cl and C1
b. Na and Cl
C. C.and o
d. N and O
How are gluons involved in forces within the atom?
A. Electrostatic forces use gluons to hold electrons together .
B. Gluons cause protons to repel each other in the nucleus.
C. Gluons are emitted as radioactive particles by the weak nuclear force .
D. Strong nuclear forces act through gluons in the nucleus.
Answer:
D
Explanation:
Took the test!
Gluons act as exchange particles and are known as gauge bosons. They are involved in the forces within the atom as a strong nuclear force that binds the nucleus. Thus, option D is correct.
What is a strong nuclear force?A strong nuclear force is a type of interaction that is present inside the atom and involves the nucleus. They bind the quarks to make the neutron and the proton, sub-atomic particles.
The strong nuclear force holds the atomic nucleus together and depends on the spin but not the charge. These forces are due to the interaction between the gluons and are stronger than the chemical bonds. The exchange of the mesons results in nucleons that lead to a strong nuclear force.
Therefore, option D. the gluons are responsible for the strong nuclear forces that bind the nucleus.
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Identify the molecule with the highest boiling point. A(.C 6H 6 B(. NH 3 C(. OF 2 D(. CHCl 3
Answer:
C6H6
Explanation:
benzene (C6H6) is 80.1°C. ammonia (NH3) is -33.3°Coxygen difluoride (OF2) is -144.7°C.chloroform (CHCI 3) is 61.2°C.How many joules of heat are giving off when 5.9 g of water cools from 75°C to 25 Celsius
Explanation:
The base form (or root) of a verb is the form listed in the dictionary. It is the version of the verb without any endings (endings such as -s, -ing, and ed). The base form is the same as the infinitive (e.g., to walk, to paint, to think) but without the to.
What state of matter has the most kinetic energy?
A gas
B liquid
C solid
Answer:
gaseous state.
Explanation:
that's the answer
What is the specific heat of a mystery substance that requires 79 joules of energy to heat 4.52
grams of substance from 23 degrees Celsius to 54 degrees Celsius?
The specific heat of a mystery substance that requires 79 joules of energy to heat 4.52 grams of substance from 23 degrees Celsius to 54 degrees Celsius is 0.56 J/g°C.
How to calculate specific heat capacity?The specific heat capacity of a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or released (J)m = mass of substancec = specific heat capacity∆T = change in temperature (°C)c = Q/m∆T
c = 79 ÷ 4.52 × (54 - 23)
c = 79 ÷ 140.12
c = 0.56 J/g°C
Therefore, the specific heat of a mystery substance that requires 79 joules of energy to heat 4.52 grams of substance from 23 degrees Celsius to 54 degrees Celsius is 0.56 J/g°C.
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A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize. What was the molarity of the hydrochloric acid (M)? (Start by writing and balancing the reaction.)
A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize, then the molarity of HCl is 0.471 M.
How do we calculate molarity?Molarity will be calculated by using the below equation as:
M = n/V, where
V = volume of solvent
n is the moles of solute and it will be calculated by using the below equation:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Moles of Ca(OH)₂ = 0.506g / 74.093g/mol = 0.0068 mol
From the stoichiometry of the reaction:
0.0068 moles of Ca(OH)₂ = reacts with 2×0.0068 = 0.0136 moles of HCl
Given volume of HCl = 28.85mL = 0.02885 L
On putting values on the molarity equation, we get
M = 0.0136 / 0.02885 = 0.471 M
Hence required molarity of HCl is 0.471 M.
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The wet adiabatic lapse rate (or saturated adiabatic lapse rate) varies with temperature, is 0.5°C/100 m (5°C/km or 3.3°F/1,000 ft), and happens when the air is completely __________ with water vapor at its dew point.
This happens when the air is completely Saturated with water vapor at its dew point
What is wet adiabatic lapse rate ?Wet adiabatic lapse rate is the rate at which a saturated wet air cools down with increase in altitude through an adiabatic process. This is process is also known as saturated adiabatic lapse rate.
Hence we can conclude that This happens when the air is completely Saturated with water vapor at its dew point.
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Answer: saturated
Explanation:
How many moles of gas are present in the sample of gas occupies that 4.32 L at 1.45 atm pressure and -18oC? (Include your formula used and the set-up.)
The amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
Ideal Gas LawThe Ideal gas law states "that pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature of gas. It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant( [tex]R = 0.08206 Latm/molK[/tex]
Given the data in the question;
Volume; [tex]V = 4.32L[/tex]
Pressure; [tex]P = 1.45atm[/tex]
Temperature; [tex]T = -18^oC = 255.15K[/tex]
Amount of gas; [tex]n =\ ?[/tex]
To determine the moles of gas, we substitute our given values into the expression above.
[tex]PV = nRT\\\\1.45atm * 4.32L = n * 0.08206Latm/molK * 255.15K\\\\6.264Latm = n * 20.937609Latm/mol\\\\n = \frac{6.264Latm}{20.937609Latm/mol} \\\\n = 0.3mol[/tex]
Therefore, the amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
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A student is investigating the affect of different salts on melting points. Four patches of ice of equal size are roped off and a different type of salt is poured on each, one receives table salt (NaCl), one receives Calcium Chloride (CaCl2), one receives Potassium Carbonate (KCO3) and the fourth receives inert sand instead. Each patch receives an equal amount of salt or sand. What could the student investigate?
A. The air temperature near each ice patch.
B. How quickly the ice patches melt.
C. Amount of sand absorbed.
D. The amount of oxygen released as each ice patch melts.
Answer:
B
Explanation:
By finding how quickly the ice pathes melt you are able to tell how well the salt dissolves in water (ice is the solid form of H2O). Different types of salts will melt the ice at different speeds.
This is also the only answer choice that correlates with melting points so :)
What is the term used to describe why urban areas are warmer than surrounding rural areas?
Question 2 options:
Downtown island effect
Rural cooling effect
Global warming effect
Urban heat island effect
Answer:
urban heat island
Explanation:
occurs when a city experiences much warmer temperatures than nearby rural areas.
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A small rock with a mass of 13 g is dropped into a graduated cylinder containing 12 mL of water.
The water rises to 35 mL. What is the density of the rock?
The density of the rock with a mass of 13 g and is dropped into a graduated cylinder containing 12 mL of water is 0.57g/mL.
How to calculate density?The density of a substance can be calculated using the following formula:
Density = mass ÷ volume
According to this question, a small rock with a mass of 13 g is dropped into a graduated cylinder containing 12 mL of water. The water rises to 35 mL.
This means that the volume of the rock is 35 - 12 = 23mL
Density of the rock = 13g ÷ 23mL
Density = 0.57g/mL
Therefore, the density of the rock with a mass of 13 g and is dropped into a graduated cylinder containing 12 mL of water is 0.57g/mL.
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HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label for H2O?
Group of answer choices
ℓ
Answer:
Transcribed image text: Answer.
the following question for the mixing of gaseous hydrogen chloride with water to make hydrochloric acid. HCl) + H2O(2) → H30*) + Cl (2) What is the phase label on HCI? aq
In chemistry and biology, hydrolysis refers to a twofold decomposition reaction in which water participates.
The conjugate base in HCl H2O H3O+ Cl is what?HCl's conjugate base is Cl in the reaction HCl+H2O+H3O++.
An acidic solution is created when hydrogen chloride gas and water interact. The reaction's equation is displayed. Cl - + H3O + HCl + H2O
Hydroxide ion is base 2, and its conjugate acid (water) is acid1. Acid1 is HCl, and its conjugate base is base1.
The conjugate base of hydrochloric acid is the chloride ion. The hydroxide ion's conjugate acid is water
H3 O+1 is the conjugate acid of H2 O. The electrical charge on water increases by one when one hydrogen ion is added. Hydrogen is also known as H3 O+1.
In a reversible chemical reaction, H 2O and HCl join upon contact to create hydronium cations [H 3O] + and chloride anions Cl : HCl + H 2O [H 3O] + + Cl. The resulting mixture is a potent acid known as hydrochloric acid.
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Write the essential condition for the following reaction to take place:2AgBr—->2Ag+Br
This is the decomposition of silver bromide
Silver bromide decomposes to give silver and bromine
Sunlight is the decomposing agent .
The reaction takes place in sunlightHence it should be placed in sunlightAnswer:
Sunlight
Explanation:
For silver bromide (AgBr) to decompose into silver metal and bromine gas, it can only take place in the presence of sunlightThe balanced reaction :⇒ 2AgBr → 2Ag + Br₂Which of these are animal adaptations that help animals live in the deciduous forest biome? Select all that apply.
Round builds
Little feet for snow
Harder outer skin to reduce loss of water
Hibernation
Help fast!
Answer:
Hibernation
Explanation:
deciduous means trees that lose leaves during winter
match the following
Answer:
1 FOSSIL FUEL WITH A2 COMBUSTION WITH D3 PETROL WITH C4 GOBAR GAS WITH E5 FIRE EXTINGUISHER WITH B
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i need help
please help by looking at the link
Answer:
the image is not clear....
A reversible exothermic synthesis (combination) reaction produces one mole of gaseous product from two moles of gaseous
reactant. Which set of condtions will shift the reaction farthest toward the products?
A)
low temperature, low pressure
B)
low temperature, high pressure
9
high temperature, low pressure
D)
high temperature, high pressure
A 2.0g piece of Mg reacts with HNO3. Which conditions would produce the GREATEST reaction rate?
Factors that will increase product formation are;
low temperature and high pressure increasing the surface area and concentrationWhat factors affect chemical equilibrium?The position of chemical equilibrium is affected by the following factors:
temperature concentration pressure for gasesWhen equilibrium is altered by an external factor, the reaction shifts to annul the effect of that change.
For the reversible exothermic synthesis, low temperature and high pressure will shift the reaction farthest toward the products.
For the reaction of the 2.0g piece of Mg with HNO3. increasing the surface area of magnesium metal as well as increasing the concentration of HNO3 would produce the GREATEST reaction rate.
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Write a balanced equation for the precipitation reaction that was used to separate Ba2+ from Ca2+ and Mg2+.
Answer:
[tex]{\rm Ba^{2+}} \, (aq) + {\rm {SO_4}^{2-}}\, (aq) \to {\rm BaSO_{4}}\, (s)[/tex].
Explanation:
Make use of the fact that calcium sulfate [tex]{\rm CaSO_{4}}[/tex] and magnesium sulfate [tex]{\rm MgSO_{4}}[/tex] are much more soluble in water than barium sulfate [tex]{\rm BaSO_{4}}[/tex].
When sulfate ions [tex]{\rm {SO_{4}}^{2-}}[/tex] are added to dilute solutions containing [tex]{\rm Ba^{2+}}\, (aq)[/tex], [tex]{\rm Ca^{2+}}\, (aq)[/tex], and [tex]{\rm Mg^{2+}}\, (aq)[/tex], precipitation would be visible only in the solution with [tex]{\rm Ba^{2+}}\, (aq)\![/tex]. Barium sulfate would be the precipitate.
[tex]{\rm Ba^{2+}} \, (aq) + {\rm {SO_4}^{2-}}\, (aq) \to {\rm BaSO_{4}}\, (s)[/tex].
This ionic equation is balanced as it conserves both the atoms and the charges on the ions.
This is my question
Answer:
[tex] \\ [/tex]
refer the three attached images for the respective answers.
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If the oh- of a solution is 2.7x10-4m the poh of the solution is
Answer:
i dont knoe but yea just on here
Explanation:n:
hi hi hi hi
A sample 0.5 mole sample of NO2 gas occupies a 0.620 L container at 25 °C. What is the pressure of this gas?
The pressure of the sample of the gas in the container at 25 °C occupying 0.62 L is 19.73 atm
Data obtained from the question Volume (V) = 0.62 L Temperature (T) = 25 °C = 25 + 273 = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 0.5 mole Pressure (P) = ?Using the ideal gas equation, the pressure of the gas can be obtained as follow:
PV = nRT
Divide both side by V
P = nRT / V
P = (0.5 × 0.0821 × 298) / 0.62
P = 19.73 atm
Thus, the pressure of the gas is 19.73 atm
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Your car breaks down. As your friends help
you puch it, it begins to move and speed
up.
try stopping putting the car in park before fixing
How are Jupiter, Saturn, and Uranus similiar? How are Jupiter, Saturn, and Uranus similiar?
Question 5 options:
a They are all large, gaseous planetary bodies.
b They are all planets that are the exact same size.
c They are all the same distance from the sun.
d They all have the exact same surface temperature.
Answer:
a
Explanation:
because they all are gasses
What is the numbers of molecules for 65.8g of CO2?
Answer:
One gram of carbon dioxide contains 13.6 x 10²¹ number of molecules.
Explanation:
Answer:
1.50 moles
Explanation:
use dinemential analysis
find the molar mass
what would you expect to happen if you put a red blood cell in a glass pure water distilled water g
A science teacher asked her students to calculate the density of a toy cube. The mass of the cube was 120 grams and the height of the cube was 4 centimeters.
What was the density of the cube in cubic centimeters? (**At least 2 decimal places)
Explanation:
density=> ro=m/V
m=0,12kg
V=0,04m³=6,4.10^-5
=>0,12/6,4.10^-5=1875 kg/m³
What is the unit of force
Answer:
the unit of force is newton represented with symbol "N"
