Answer:
Q = 8100 J.
Explanation:
Hello there!
In this case, according to the given information, we can infer this is a question about calorimetry, and we can use the general heat equation to solve this one:
[tex]Q=mC(T_2-T_1)[/tex]
Thus, we plug in the given mass, specific heat and temperatures to obtain the energy involved in this heating process:
[tex]Q=400g*0.11\frac{cal}{g\°C} (65\°C-21\°C)\\\\Q=1936cal[/tex]
Which converted to Joules turns out to be:
[tex]Q=1936cal*\frac{4.184J}{1cal} \\\\Q=8100J[/tex]
Regards!
21. What type of cells are found on the retina and provide signals to the brain about incoming light?
A photoreceivers
B optic cells
C photoreceptors
D retina cells
Answer:
Explanation:
have a good day
A gas has a pressure of 3.33 kPa at 343 K. What will the new pressure be at 655 K if the volume does not change?
Is this an alpha or beta decay?
Answer:
alpha decay
Explanation:
The pressure of a sample of helium in a 200. ml container is 2.0 atm. If the helium is compressed to a pressure of 40. atm without changing the temperature, what would be the new volume of the gas
Answer:
[tex]V_2=10mL[/tex]
Explanation:
Hello there!
In this case, according to the given information, it will be possible for us to solve this problem by using the Boyle's law as an inversely proportional relationship between pressure and volume:
[tex]P_2V_2=P_1V_1[/tex]
In such a way, we solve for the final volume, V2, and plug in the initial volume and pressure and final pressure to obtain:
[tex]V_2=\frac{P_1V_1}{P_2} \\\\V_2=\frac{2.0atm*200.mL}{40.atm}\\\\V_2=10mL[/tex]
Regards!
If 250. ML of water are poured into the measuring cup, the volume reading is 8.45 oz . This indicates that 250. ML and 8.45 oz are equivalent. How many milliliters are in a fluid ounce based on this data?
Answer:
[tex]1oz=29.589ml[/tex]
Explanation:
From the question we are told that:
Initial Volume [tex]v_1=250ml[/tex]
Final Volume [tex]v_2=8.45oz[/tex]
Generally the equation for one ounce is mathematically given by
[tex]1oz=\frac{v_1}{v_2}[/tex]
Therefore
[tex]1oz=\frac{250}{8.45}[/tex]
[tex]1oz=29.589ml[/tex]
Phenolphthalein meaning
Answer:
Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
Answer:
Phenolphthalein is a chemical compound, a colorless crystalline solid, though pink in a alkaline solution, and is also used as an acid-base indicator.
Explanation:
I'll give brainless! no l!nks!!!
1. Imagine a very warm 60 degree day in January with a steady rain. What type of air mass would you expect to be bringing in this weather pattern?
2. Imagine a very cold 20 degree day in January with lots of blue sunny skies. What type of air mass would you expect to be bringing in this weather pattern?
Answer:
Maritime tropical air mass
Continental polar air mass
how does a flourmill work?
Explanation:
Answer ⬇️
These mills employed millstones that rotated against one another to crush grains into flour mill machine. They rely on a process of crushing grain between two rapidly rotating rollers, then separating the ground grain into individual components, including bran, germ and endosperm.
➡️dhruv73143(⌐■-■)
what are the environmental impacts of coal
Answer:
Look down below
Explanation:
Environmmetal impacts that coal can cause is Sulfur dioxide (SO2), which contributes to acid rain and respiratory illness.
AND.....
Nitrogen oxides (NOx), which contribute to smog and respiratory illnesses. Particulates, which contribute to smog, haze, and respiratory illnesses and lung disease
A metal object with mass of 29.0 g is heated to 97.0 °C and then transferred to an insulated container containing 95.8 g of water at 20.5 °C. The water temperature rises and the temperature of the metal object falls until they both reach the same final temperature of 23.7 °C. What is the specific heat of this metal object? Assume that all the heat lost by the metal object is absorbed by the water.
Answer:
0.603J/g°C is the specific heat of the metal object
Explanation:
To solve this question we must know the heat given by the metal is equal to the heat absorbed by the water. The change in heat follows the equation:
Q = m*S*ΔT
Where Q is heat in Joules, m is the mass of the substance, S its specific heat and ΔT change in temperature
The equation to solve the problem is:
m(Object)*S(Object)*ΔT(Object) = m(Water)*S(Water)*ΔT(Water)
Where:
m(Object) = 29.0g
S(Object) = ??
ΔT(Object) = (97.0°C - 23.7°C = 73.3°C)
m(Water) = 95.8g
S(Water) = 4.184J/g°C
ΔT(Water) = (23.7°C - 20.5°C = 3.2°C)
29.0g*S(Object)*73.3°C = 95.8g*4.184J/g°C*3.2°C
S (Object) * 2125.7g°C = 1282.6J
S(Object) = 0.603J/g°C is the specific heat of the metal object
How many grams are in 3.14 moles of PI₃?
Answer:
[tex]\boxed {\boxed {\sf 1290 \ g \ PI_3}}[/tex]
Explanation:
We want to convert from moles to grams, so we must use the molar mass.
1. Molar MassThe molar mass is the mass of 1 mole of a substance. It is the same as the atomic masses on the Periodic Table, but the units are grams per mole (g/mol) instead of atomic mass units (amu).
We are given the compound PI₃ or phosphorus triiodide. Look up the molar masses of the individual elements.
Phosphorus (P): 30.973762 g/molIodine (I): 126.9045 g/molNote that there is a subscript of 3 after the I in the formula. This means there are 3 moles of iodine in 1 mole of the compound PI₃. We should multiply iodine's molar mass by 3, then add phosphorus's molar mass.
I₃: 126.9045 * 3=380.7135 g/mol PI₃: 30.973762 + 380.7135 = 411.687262 g/mol 2. Convert Moles to GramsUse the molar mass as a ratio.
[tex]\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]
We want to convert 3.14 moles to grams, so we multiply by that value.
[tex]3.14 \ mol \ PI_3 *\frac {411.687262 \ g \ PI_3}{ 1 \ mol \ PI_3}[/tex]
The units of moles of PI₃ cancel.
[tex]3.14 *\frac {411.687262 \ g \ PI_3}{ 1 }[/tex]
[tex]1292.698 \ g\ PI_3[/tex]
3. RoundThe original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tens place.
1292.698The 2 in the ones place tells us to leave the 9.
[tex]1290 \ g \ PI_3[/tex]
3.14 moles of phosphorous triiodide is approximately equal to 1290 grams of phosphorus triodide.
Calculate the number of atoms in 6.5 moles of NaCI
Answer:
[tex]1 \: mole = 6.02 \times {10}^{23} \: atoms \\ 6.5 \: moles = (6.5 \times {6.02 \times 10}^{23} ) \: atoms \\ = 3.913 \times {10}^{24} \: atoms[/tex]
where do fossils live
The concentration of carbon-14 in a piece of wood from an ancient burial mound indicates that two half-lives of this radioisotope have passed. If the half-life (t 1/2) for carbon-14 is 5730 years, approximately how many years ago did this sample of wood die?
If the half-life for carbon-14 is 5730 years, then it will take 11,460 years to complete die of this sample.
What is half life period?Half life period is a time of decay in which concentration of reactant is left half of its initial concentration, means half of the reactant will convert into product.
Total time of decay will be calculated as:
T = (t)ⁿ, where
t = half life time = 5730 years
n = number of half lives = 2 (given)
On putting values, we get
T = (5730)² = 11,460 years
Hence required time for decay is 11,460 years.
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Answer:
The first part is 5 and the second part is 28,650
Which will decrease the rate of a reaction?
changing the temperature from 90ºC to 40ºC
adjusting the concentration from 30 ng to 60 ng
placing the substance in a smaller container
grinding the substance into a powder
Explanation:
The reaction rate decreases with a decrease in temperature. Catalysts can lower the activation energy and increase the reaction rate without being consumed in the reaction. Differences in the inherent structures of reactants can lead to differences in reaction rates.
what does Avogadro's law state and what is the formula
The law is approximately valid for real gases at sufficiently low pressures and high temperatures. The specific number of molecules in one gram-mole of a substance, defined as the molecular weight in grams, is 6.02214076 × 1023, a quantity called Avogadro's number, or the Avogadro constant.
Answer:
Hello There!!
Explanation:
The answer is that it states that under the same pressure and temperature conditions, equal volumes of all gases contain the same number of molecules.
Formula:Vn=k
hope this helps,have a great day!!
~Pinky~
3. How is the equilibrium position of this reaction affected
by the following changes?
2802 (g) + O2 (g) <-------------→ 2 S03(g) + heat
a. Lowering the temperature.
b. Decreasing the pressure
c. Removing oxygen
d. Adding sulfur trioxide (SO3).
Answer:
Explanation: a) Reaction is exothermic because heat is released
If temperature is lowered, amount of products is increased,
equilibrium transfers to right
b) If pressure decreases, equilibrium transfers to direction in which amount of gas moles is greater, also in left (reactants)
c) If Oxygen is removed, reaction which produces more oxygen is favoured, also balance changes to reactansts (left)
d) Adding product causes equilibrium transfer to left (reactansts)
How can the coefficients in a balanced chemical reaction be used to convert from moles of a reactant to moles of a product?
The coefficients in a balanced equation can be used as molar ratios, which can act as conversion factors to relate the reactants to the products. These conversion factors state the ratio of reactants that react but do not tell exactly how much of each substance is actually involved in the reaction.
explain how lithium atom is positive charge
plz help me solve this question is it A,B,C or D
Answer:
B - To increase the rate of the reaction
Explanation:
Catalysts speed up the reaction without being reactants or products, so aren't used up in the reaction.
If I have 1.9 moles of gas held at a pressure of 5 atm and in a container with a volume of 100 liters, what is the temperature of the gas? 3205K
Answer:
T = 3206.89 K
Explanation:
Given that,
Number of moles, n = 1.9 moles
Pressure, P = 5 atm
Volume, V = 100 L
We need to find the temperature of the gas. Let the temperature is T. We know that,
PV = nRT
Where
R is gas constant, R = 0.08206 L-atm/mol-K
Put all the values,
[tex]T=\dfrac{PV}{nR}\\\\T=\dfrac{5\times 100}{1.9\times 0.08206 }\\\\T=3206.89\ K[/tex]
So, the temperature of the gas is 3206.89 K.
Which oxide is covalent?
A. AsO2 B. K2O
C. CuO D. ZnO
Answer:
A.
Cu Zn K is are metals which form ionic bond with oxygen
List and describe two differences between pure substances and mixtures. Check all that apply. Check all that apply. The composition of a pure substance depends on the source, but the composition of a mixture doesn't depend on the source. The composition of a pure substance is always the same, regardless of the source, but the composition of a mixture can vary. The state of a pure substance is always the same, but the state of a mixture can vary. Mixtures can be separated into their components only by chemical changes; some pure substances can be separated into components by physical change. Mixtures can be separated into their components by physical changes; some pure substances can be separated into components by chemical change.
Answer:
The composition of a pure substance is always the same, regardless of the source, but the composition of a mixture can vary.
Mixtures can be separated into their components by physical changes; some pure substances can be separated into components by chemical change.
Explanation:
A chemically pure substance has a well defined and constant composition. The composition of a chemically pure substance remains the same irrespective of its source. Also, the components of a chemically pure substance may be separated by chemical changes.
Mixtures have a variable composition depending on their respective sources. The composition of a mixture varies with the source of the mixture and mixtures are separated by physical processes.
significant figures to 2.3 x 4.50
Answer:
10.35= 4 sig figs but change it to 2 since it's 2.3 is the lowest number
10.
hope this helps
have a good day :)
Explanation:
Which of the following single replacement reactions will take place?
O Al + Mg(NO3)2 -->
O Cu + Mg(NO3)2 -->
Ca + Mg(NO3)2 -->
O Zn + Mg(NO3)2
-->
Answer:
O Al + Mg(NO3)2 -->
Explanation:
2Cr^3 + 3Zn(s) -> 2Cr(s) + 3Zn^2 + (aq) which reactant is reduced and which is oxidicided
Answer:
Cr is oxidised
and
Zn is reduced
[ Reduced reactant ] :
Cr^( + 3 ) + 3 e^( - 1 ) ===》 Cr^( 0 )
_____________________________
[ Oxidicided reactant ] :
Zn^(0) ===》Zn^( + 2 ) + 2 e^( - 1 )
Two hundred liters of helium at 2.00 atm and 28.0 °C is placed into a tank with an internal pressure of 5.92 atm. Find the volume of the helium
after it is creleased into the tank when the temperature of the tank.remains 28.0°C.
liters (Round to three sig figs)
Answer:
27*6 dkfkdh hshsnnsbssshs ss. hhshsns svs s ssjssgsyz
Explanation:
ysgshssbs
Which pair of formulas represents the empirical formula and the molecular formula of a compound?
Answer:
CH2O and C6H12O6
Explanation:
To find an empirical formula, take a molecular formula and divide the subscript of each element by the greatest common factor of all the subscripts. In this case, the only pair that works is CH2O,C6H12O6, which can be verified by dividing the coefficients of the molecular formula by 6.
5.(08.02 MC)
A 0.0400 M NaCl solution was formed when 32.0 grams of NaCl was dissolved in enough water. What was the total volume of the solution formed? (5 points)
O 7.20 liters
9.80 liters
13.7 liters
18.1 liters
Answer:
13.7 liters
Explanation:
I took the test and got it right
The total volume of the NaCl solution whose molarity is 0.04 M is 13.7 liters.
What is molarity?Molarity of any solution is define as the number of moles of solute present in per liter of the solution and it will be represented as:
M = n/V
Mass from moles will be calculated as:
n = W/M, where
W = given mass of NaCl = 32g
M = molar mass of NaCl = 58.44g/mol
mole = 32g / 58.44g/mol = 0.547 mol
Molarity of solution = 0.04 M
On putting values on the above equation, we get volume as:
V = 0.547 mol / 0.04mol/L
V = 13.67 L = 13.7L
Hence required value of volume is 13.7 L.
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A dead tree is not an important part of an ecosystem. T or F