Answer:
In a closed system, the total energy before an energy transformation is __equal to__ the total energy after it.
Explanation:
The Law of Conservation of Energy
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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
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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what is the mass of an electron?
0 amu
1 amu
2 amu
dependent upon the type of element
PLEASE HELP
Answer:
the answer is 0 amu I hope it helps
how do i open the link when i get a question answered
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:
What is the best synonym for "alloy?"
A: nonmetal
B: mineral
C:blend
D:stone
Why is knowing where volcanoes and earthquakes occur important?
Please help!!!!!
Calculate the molar mass
Answer:
52
Explanation:
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??
Answer:
C) closely arranged and in fixed positions
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
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.
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
Please answer the question
Answer: c
Explanation:
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?
Answer:
385
Explanation:
0.250m Converted to 250 mL then 250+135+ the answer
I'm not sure?
Why is it important to predict consequences when decision-making?
A.Considering the consequences can help you pick the option with the best outcome.
B.Predicting consequences isn’t a step in the decision-making process.
C.There usually aren’t any consequences when making decisions.
D.Consequences won’t help you make a decision.
what's different between fat molecules and carbohydrate and protein molecules
Answer:
ddwadadadadwd
Explanation:
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?
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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the element chlorine is a gas. it's formula is cl2 . how many different masses of the cl2 molecule would you expect to find in a sample of chlorine gas ? explain your answer
Answer:
the answer is 3.33⋅1023 molecules of Cl2. Note that 6.022⋅1023 is also known as Avogadro's number, and it can be referred to as the number of molecules in one mole of that substance. Also, I calculated 70.9 because 35.45 g/mol (the mass of one Chlorine atom) times 2 is 70.9 g/mol (Cl2 has two Chlorine atoms).
Explanation:
Adiabatic process is a process in which _ is constant (a) temperature (b)volume (c)pressure (d) heat
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
Can someone answer this pls
Answer:12
Explanation:
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
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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Number 8 plsssssssssss
Answer:
the correct answer is commensalism
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.
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 of the following has the LONGEST wavelength
A.) a lion growling at a frequency of 85 Hz
B.) a bass guitar playing a note at a frequency of 150 Hz
C.) a man speaking at a frequency of 520 Hz
D.) an opera singer singing at a frequency of 2100 Hz
Answer:
D.) an opera singer singing at a frequency of 2100 Hz
Explanation:
Wavelength is inversely proportional to frequency.
The one having the LONGEST wavelength is a lion growling at a frequency of 85 Hz and the correct option is option A.
What is Electromagnetic scale?The electromagnetic spectrum is a range of frequencies corresponding to wavelengths which are a few kilometres to a fraction of the size of an atomic nucleus in the spectrum of electromagnetic waves.
As a wave, light has several basic properties that describe it. One is frequency, which counts the number of waves that pass by a given point in one second.
Another is wavelength, the distance from the peak of one wave to the peak of the next. These properties are closely and inversely related: The larger the frequency, the smaller the wavelength — and vice versa.
A third is energy, which is similar to frequency in that the higher the frequency of the light wave, the more energy it carries.
Therefore, The one having the LONGEST wavelength is a lion growling at a frequency of 85 Hz and the correct option is option A.
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Un Hidrocarburo de peso molecuar 42g/mol contiene un 85,7 de carbono, ¿cual es la formula empirica y molecular?
Answer:
1 respuesta. fórmula empírica = CH2
Explanation:
Translatation: 1 Answer. empirical formula = CH2
1. 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
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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What connects bones and muscles together?
Ligaments
Cartilage
Glue
Tendons
Answer: Tendons.
Explanation: A tendon is a fibrous connective tissue which attaches muscle to bone.
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-?
what is the wavelength of a photon with an energy of 3.38 x 10-19J?
Answer:
C. 588 nm
Explanation:
Answer:
588 mm
Explanation:
1. How many molecules are there in 24 grams of iron (III) fluoride?
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?
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
Does somebody know the answer ?
how many grams are in 2 moles of copper
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