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In a lab, students measured the mass of an unknown metal to be 46.4g The metal sample releases 769 J when it is cooled from 101.0°C to 30.00 "C, the
meal is most likely?
Lead
Copper
Mercury
Silver
Answers
Note: The value for Q was written as a negative value in the equation as heat energy was given off by the metal when the metal was cooled (from the metal’s point of view, it’s losing heat energy).
Related Questions
how do i open the link when i get a question answered
Answers
Answer:
Just click on the answer, if it is an external link DO NOT CLICK IT. it may contain dangerous stuff including h*cked stuff.
Explanation:
Adiabatic process is a process in which _ is constant (a) temperature (b)volume (c)pressure (d) heat
Answers
Answer: Adiabatic process is a process in which heat is constant
Explanation:
The processes in which temperature remains constant is called isothermal process.
The process in which Volume remains constant is called isochoric process.
The process in which pressure remains constant is called isobaric process.
The process in which no heat is gained or lost by the system, Hence heat remains constant is called as adiabatic process.
Thus option d) heat is correct
How many moles of HCl can be neutralized by 0.1 liter of 0.5 M NaOH? A. 0.1 B. 0.05 C. 0.5 D. 0.4
Answers
Answer:
B. 0.05
Explanation:
The reaction that takes place is:
HCl + NaOH → NaCl + H₂OAs 1 mol of NaOH reacts with 1 mol of HCl, to solve this problem what we need to do is calculate the number of NaOH moles contained in 0.1 liters of a 0.5 M solution:
Molarity = Moles / litersMoles = Molarity * liters0.5 M * 0.1 L = 0.05 molThe moles of Hydrogen chloride required to neutralize the 0.1 liter of 0.5 M Sodium hydroxide is 0.05 moles.
How do we calculate moles?Moles (n) of any substance will be calculated by using the molarity (M) as:
M = n/V, where
V = volume
Given chemical reaction is:
NaOH +HCl → NaCl + H₂O
Moles of 0.5M NaOH will be calculated as:
n = (0.5)(0.1) = 0.05 moles
From the stoichiometry of the reaction it is clear that:
1 mole of NaOH = react with 1 mole of HCl
0.05 mole of NaOH = react with 0.05 mole of HCl
Hence option (B) is correct.
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explain why decomposition uses solar energy
Answers
Answer:
Without the sun's energy, biological life would not be able to exist to decompose. Many microbes and fungi do their best work out of direct sunlight.
In an ecosystem, microbes make use of solar energy to decompose dead plant and animals.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.
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Cd(s)+2HCI(aq)---- H2(g)+CdCl2(aq). what volume in liters of 0.81m HCI solution would be needed to fully react with 32.71g Cd. answer only please
Answers
Answer:
0.718L of 0.81M HCl are required
Explanation:
Based on the reaction:
Cd(s)+2HCI(aq) → H2(g)+CdCl2(aq)
1 mol of Cd reacts with 2 moles of HCl
To solve this question we must, as first, find the moles of Cd. With the moles of Cd we can find the moles of HCl needed to react completely with the Cd. With the moles and the molarity we can find the volume:
Moles Cd -Molar mass: 112.411g/mol-:
32.71g * (1mol / 112.411g) = 0.2910 moles Cd
Moles HCl:
0.2910 moles Cd * (2 moles HCl / 1mol Cd) =
0.5820 moles HCl
Volume:
0.5820 moles HCl * (1L / 0.81moles) =
0.718L of 0.81M HCl are required1. Pressures up to 3000 bar are measured with a dead-weight gauge. The piston diameter is 4 mm. What is the approximate mass in kg of the weights required
Answers
Answer:
The approximate mass of the weight required is 348.3 kg
Explanation:
The dimensions of the dead-weight gauge are;
The pressure up to which the dead-weight gauge measures, P = 3,000 bar
The diameter of the piston of the dead-weight gauge, D = 4 mm = 0.004 m
The dead-weight gauge pressure formula is given as follows;
Pressure, P = The weight applied, W ÷ The area the weight is applied, A
∴ The weight applied, W = P × A
Where;
P = Pressure
A = The area the weight is applied
W = The weight applied to the piston
The area the weight is applied, A = The area of the piston = π·D²/4
Where;
D = The diameter of the piston
∴ A = π × (0.004 m)²/4
When P = 3,00 bar, and A = π × (0.004 m)²/4, we have;
The weight applied, W = P × A
∴ W = 3,000 × π × (0.004 m)²/4 ≈ 3,769.9118 N
W ≈ 3,769.9118 N
W = m·g
Where;
m = The mass of weight
g = The acceleration due to gravity ≈ 9.81 m/s²
m = W/g
∴ m = 3,769.9118 N/(9.81 m/s²) ≈ 384.3 kg
The approximate mass of the weight required, m = 348.3 kg.
We started by Solving for the force and then the area of the piston, we then applied the formula for force using the constant for acceleration due to gravity and the mass was found to be 384.34 kg
Given Data
Pressure = 3000 bar
Diameter = 4mm
Let us convert bar to N/mm^2
1 bar = 0.1 N/mm^2
3000 bar = x N/mm^2
= 0.1*3000
= 300 N/mm^2
We know that pressure P = Force/Area
Let us find the area of the piston
Area = πd^2/4
Area = 3.142*4^2/4
Area = 3.142*16/4
Area = 50.272/4
Area = 12.568 mm^2
Let us find the force F
F = P*Area
F = 300*12.568
F = 3770.4 Newton
We know that Force = Mg
g = 9.81 m/s^2
Hence, m = F/g
m = 3770.4/9.81
m = 384.34 kg
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A rubber ball contains .570 mL of gas at a pressure of 2.05 atm. What volume will the gas Couoh at 7.47 atm?
Answers
Answer:
the volume that the gas occupy at 7.47 atm is 0.1564 liters
Explanation:
The computation of the volume that the gas occupy at 7.47 atm is shown below:
As we know that
P1V1 = P2V2
Now
V2 = P1V1 ÷ P2
= 2.05 atm × 0.570 liters ÷ 7.47 atm
= 0.1564 liters
Hence, the volume that the gas occupy at 7.47 atm is 0.1564 liters
So the same would be considered and relevant
Which of the following is a correct description for solids?
A) closely arranged and vibrate in fixed positions
B) closely arranged and can move around
C) closely arranged and in fixed positions
Can you help me Please??
Answers
Answer:
C) closely arranged and in fixed positions
Why do North and South Pole have different winter times?
The two poles have different location.
North Pole is found in the Western Hemisphere.
The tilt of the Earth towards the Sun changes throughout the year.
North Pole is found in the Northern Hemisphere.
Answers
Answer:
Explanation:
Both the Arctic (North Pole) and the Antarctic (South Pole) are cold because they don't get any direct sunlight. The Sun is always low on the horizon, even in the middle of summer. In winter, the Sun is so far below the horizon that it doesn't come up at all for months at a time.
Answer:
The tilt of the Earth towards the Sun changes throughout the year.
Explanation
Which ionization process requires the most energy? which ionization process requires the most energy? f(g) → f +(g) + e- o(g) → o +(g) + e- f +(g) → f 2+(g) + e- o +(g) → o 2+(g) + e-?
Answers
1. How many molecules are there in 24 grams of iron (III) fluoride?
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Does somebody know the answer ?
Answers
Just a caveat: this equation isn’t balanced.
6. A piece of solid gold was heated from 274K to 314K. 35.73 of energy was needed to raise the temperature.
What mass of gold was present?
Answers
From Q = mcΔT, we can rearrange the equation to solve for mass, m = Q/cΔT. The specific heat capacity, c, of solid gold is 0.129 J/g °C. I'm assuming that the energy is given in joules, as it's not specified in the question as written.
m = Q/cΔT = (35.73 J)/(0.129 J/g °C)(40.85 °C - 0.85°C)
m = 6.92 g of gold was present
The heat of the substance depends on the mass, specific heat, and temperature change of the system. The mass of gold that was present was, 6.92 g.
What is mass?Mass of the substance in the thermodynamic system is the ratio of the heat to the product of the specific heat and the temperature change. It is given as,
[tex]\rm m = \rm \dfrac{Q}{c \Delta T}[/tex]
Given,
Heat (Q) = 35.73 J
Specific heat (c) = 0.129 J/g °C
Temperature change = 40 degrees celsius
Mass of gold is calculated as:
35.73 ÷ (0.129) (40) = 6.92 gm
Therefore, 6.92 gms of gold is present.
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Un Hidrocarburo de peso molecuar 42g/mol contiene un 85,7 de carbono, ¿cual es la formula empirica y molecular?
Answers
Answer:
1 respuesta. fórmula empírica = CH2
Explanation:
Translatation: 1 Answer. empirical formula = CH2
A full moon appears on July 1: On what date is the next full moon likely to appear in the night sky?
А July 15
B July 29
C August 14
D August 28
Answers
A full Moon chances roughly every 29.5 days, so it may be possible the next full moon likely to appear in the night sky of Earth on July 29, hence the option B is correct.
The lunar phase during which the Moon is completely lit from Earth's viewpoint is known as the full moon.
When Earth is situated halfway between the Sun and the Moon, this happens. This indicates that the near side of the moon, which faces Earth, is fully illuminated by the sun and appears as a roughly round disc.
A full Moon chances roughly every 29.5 days, so it may be possible the next full moon likely to appear in the night sky on July 29.
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What is the equilibrium constant for the chemical equation:
1. N2 (g) + 3H2 (g) ↔ 2NH3 (g)
At equilibrium, the concentration of N2 is 2.5 x 10-4 M, the concentration of H2 is 6.4 x 10-3 M, and the concentration of NH3 is 5.3 x 10-2 M.
Write out the equilibrium constant, Keq, and show you work.
2. Mg3P2 (s) ↔ 3Mg+2 (aq) + 2P-3 (aq)
At equilibrium, the concentration of Mg3P2 is 5.5 x 10-6 M, the concentration of magnesium ions is 7.2 x 10-5 M, and the concentration of phosphide ions is 9.8 x 10-8 M.
Write out the equilibrium constant, Keq, and show you work.
Answers
Answer:
beaner
Explanation:
Answer:
x= 1 /5 y+ 4 /5
Explanation:
Let's solve for x.
10x−2y=8
Step 1: Add 2y to both sides.
10x−2y+2y=8+2y
10x=2y+8
Step 2: Divide both sides by 10.
10x /10 = 2y+8 /10 x= 1 /5 y+ 4 /5
Please answer the question
Answers
Answer: c
Explanation:
Gas density can be calculated by dividing the mass of gas by its volume. If you took a balloon of gas and then warmed the balloon in a sunny window, what can now be said about the density of the gas in the balloon? Gas density can be calculated by dividing the mass of gas by its volume. If you took a balloon of gas and then warmed the balloon in a sunny window, what can now be said about the density of the gas in the balloon? The gas density will decrease. The gas density will remain the same. The gas density will increase. The density of gases is independent of temperature. none of the above
Answers
Answer: The density will decrease
Explanation: Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density.
3.
Which quantity of salt will form an
unsaturated solution in 100 g of water
at 50°C?
(1) 43 g of KCI
(2) 50 g of NH4Cl
(3) 100 g of KNO,
(4) 116 g of NaNO,
Answers
Answer:
Option D, 116 g of NaNO3
Explanation:
An unsaturated solution is the one in which the amount of salt dissolved in more than the maximum amount of salt that can be dissolved in it.
At 50 degree Celsius, 37 grams of salt can be dissolved in 100 ml of water. Hence, 116 gram of salt is the correct answer
*Urgent*
A balloon has a volume of 31.8 L at a temperature of 46 degrees C. What is the new temperature
of the balloon in degrees C if the volume is changed to 49.2 liters?
Round answers to 0.1 decimals
Answers
Answer:
The new volume will be
0.7 L
Explanation:
This is an illustration of Charles' law, some of the time called the temperature-volume law. It expresses that the volume of a gas is straightforwardly corresponding to the Kelvin temperature, while pressing factor and sum are held steady. The condition is V 1 T 1 = V 2 T 2 , where V is volume and T is temperature in Kelvins. Known V 1 = 0.5 L T 1 = 20 ∘ C + 273.15 = 293 K T 2 = 150 ∘ C + 273.15 = 423 K Obscure V 2 Arrangement Revise the condition to confine V 2 . Substitute the known qualities into the condition and address. V 2 = V 1 T 2 T 1 V 2 = ( 0.5 L × 423 K ) 293 K = 0.7 L adjusted to one huge figure
GUYS HELP PLS QUICK LOTS OF POINTS AND BRAINLIEST!
A 0.250 M solution was prepared from 135 mL of a 7.00 solution. What volume of water (in mL) was required for dilution?
Answers
Answer:
385
Explanation:
0.250m Converted to 250 mL then 250+135+ the answer
I'm not sure?
A compound found in the athletes urine had a percent composition of 80.8% carbon, 8.97% hydrogen and 10.3% oxygen. What is the Empirical formula of the compound? What is the molecular formula of the compound if the molar mass of the compound is 312g/mol?
Answers
Answer:
C21H2802
Explanation:
C=12g/mol
H=1g/mol
O=16g/mol
Part (C) of compound-80.18%
(0.8018 x 312)/12=21
Part (H) of compound-8.97%
(0.897 x 312)/1=28
Part (O) of compund-10.3%
(0.103 x 312)/16 = 2
Therefore the emp. formula is C12H28O2
Question is in picture! Will give extra points and BRAINLIEST! Promise!!! No links or I will report. Make sure it’s a legitimate answer and not a link
Answers
6. Which two regions of Earth in the illustration are experiencing winter?
N
Sun
Position
A. Northern and Southern Hemispheres at position A
B. Northern Hemisphere at position A and Southern Hemisphere at position B
C. Northern and Southern Hemispheres at position B
D. Northern Hemisphere at position B and Southern Hemisphere at position A
Answers
Answer:
B
Explanation:
Guys im going to be going over these with my teacher tomorrow so please help me if u have a little bit of humanity inside you ASAP
Answers
Answer:
5. Amplitude.
6. 344.8 meters/second
Explanation:
5. The energy is proportional to the amplitude is all I remember. Sorry :/ Been a long time since I took these classes.
6. Traveling to the wall & back is 200m
100 + 100 = 200m total traveled
The time is 0.58s so, we can use the speed formula to solve [ s = d/t ] where s = speed, d = distance, and t = time.
s = 200/0.58
s = 344.82758
I don’t know if they’ll have you round, but I would say the speed of the sound is 344.8 m/s.
Number 8 plsssssssssss
Answers
Answer:
the correct answer is commensalism
What is the best synonym for "alloy?"
A: nonmetal
B: mineral
C:blend
D:stone
Answers
The answer is c
Blend
what is the mass of an electron?
0 amu
1 amu
2 amu
dependent upon the type of element
PLEASE HELP
Answers
Answer:
the answer is 0 amu I hope it helps
Why is knowing where volcanoes and earthquakes occur important?
Please help!!!!!
Answers
how many grams are in 2 moles of copper
Answers
Answer:
In 2 moles of copper, there are 319.2172 grams.
Explanation:
Quick conversion chart of moles Copper(II) Sulfate to grams 1 moles Copper(II) Sulfate to grams = 159.6086 grams 2 moles Copper(II) Sulfate to grams = 319.2172 grams