Answer:
Density, [tex]d=0.82\ g/cm^3[/tex]
Explanation:
It is given that,
Mass of an unknown liquid, m = 20.5 g
The volume of unknown liquid is 25 mL
We need to find the volume of the brass object. Mass per unit volume of an object is called its density.
We know that, 1 mL = 1 cm³
So, 25 mL = 25 cm³
[tex]d=\dfrac{m}{V}[/tex]
Putting the values, we get :
[tex]d=\dfrac{20.5\ g}{25\ cm^3}\\\\d=0.82\ g/cm^3[/tex]
So, the density of this substance is [tex]0.82\ g/cm^3[/tex]
What is the natural phenomenon that moves the
cough droplets through the air?
Answer:
For a mild human cough in air at 20 °C and 50% relative humidity, we found that ... larger droplets are dispersed into smaller ones gradually while moving away from the ... Complex phase change and transport phenomena such as evaporation and ... Natural Ventilation for Infection Control in Health-Care Settings
Explanation
true or false .Heat is the movement of thermal energy from one place to another.
Answer:
true.................
Answer:
Thermal energy that is transferred from one substance to another,moves from warmer to cooler objects. So True.
Explanation:
water has density of 1.0 g/L. What volume of water has mass 250 g?
Answer:
Examine the units: If the density is 1 g/mL, how many mL do you need to make 250 g?
X mL * 1 g/mL = 250 g
Solve for X
x mL = 250 g / 1 g/mL = 250 mL
Hope this helps :)
The volume of water = 250 L
The formula for density:
[tex]density = \frac{mass}{volume}[/tex]
Given, density = 1.0 g/L = 0.001 kg/L
mass = 250 g = 0.25 kg
Putting the values in the equation
[tex]0.001 = \frac{0.25}{volume}[/tex]
[tex]volume = \frac{0.25}{0.001}[/tex]
[tex]volume = 250 L[/tex]
Hence, the volume of the water is 250 L.
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What is the shape of s-subshell?
Thus, the s subshell may contain only one orbital and the p subshell may contain three orbitals. Each orbital has its own distinct shape. An s orbital found in a s subshell is spherical, p orbitals found in p subshells are two-lobed, and d orbitals found in d subshells are four-lobed.
Answer:
The s-subshell may contain only one orbit and the p-subshell may contain three orbits . Each orbit has it own distinct shape
May this helps you
Frank has a sample of steel that weighs 80 grams. If the density of his sample of steel is 8 g/cm3, what is the sample’s volume? The sample’s volume is cm3.
Answer:
The volume of the steel is 10cm3
Explanation:
Density is defined as the mass contained per unit volume.
Density= Mass
volume
Given : Mass of steel = 80 grams
Density of steel = 8g/cm3
Putting in the values we get:
8g/cm3 = 80g
Volume
Volume=80/8
=10
Thus the volume of steel is 10cm3
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the volume of sample of steel is 10cm³ if the density of his sample of steel is 8 g/cm³.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically, the formula for density can be given as
Density = Mass of the metal ÷volume marked on the graduated cylinder
Mass of steel = 80 grams
Density of steel = 8g/cm³
substituting all the given values in the above equation, we get
Volume of steel=80/8
On calculations, we get
Volume of steel =10cm³
Therefore, the volume of sample of steel is 10cm³.
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Make a circle graph for each set of data. Top 5 Most Linked-To Sites on the World Wide Web Site Hits (millions) America Online (www.aol.com) 93.0 Microsoft (www.msn.com) 83.8 Yahoo! (www.yahoo.com) 80.2 Terra Lycos (www.lycos.com) 40.3 About (www.about.com) 36.6 Source: Scholastic Kid’s Almanac, 2001 a. A circle graph. America Online is about 25 percent; Microsoft, 25 percent; Yahoo 23 percent; Terra Lycos, 15 percent; About, 10 percent. c. A circle graph. America Online is about 27 percent; Microsoft, 27 percent; Yahoo 22 percent; Terra Lycos, 12 percent; About, 10 percent. b. A circle graph. America Online is about 12 percent; Microsoft, 10 percent; Yahoo 27 percent; Terra Lycos, 17 percent; About, 23 percent. d. A circle graph. America Online is about 12 percent; Microsoft, 10 percent; Yahoo 25 percent; Terra Lycos, 25 percent; About, 20 percent. Please select the best answer from the choices provided A B C D
Answer:
A
Explanation:
Which of the following BEST states the Law of Conservation of Matter?
Your answer:
B. The total mass of the reactants in a reaction is double the total mass of the product(s).
C. The total mass of the reactants in a reaction is less than the total mass of the product(s).
D. The total mass of the reactants in a reaction is greater than the total mass of the product(s).
Answer: there is not any correct answer but the law of conservation of matter states that the sum of the mass of the reactants should be equal to that of the product
do cfcs break down ozone
Answer:
Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up. So true.
Hope this helps! （づ￣3￣）づ╭❤～
A sample of ground beef contains 21.3% protein and 16.9% fat, both by mass. What mass of this ground beef, in grams, contains 350 Calories? Assume all Calories come from protein and fat.
Answer:
147.5 grams
Explanation:
Let the required mass of ground beef be m .
protein in it = .213 m
fat in it = .169 m
1 gram of protein gives 4 cals .
1 gram of fat gives 9 cals .
cals given by .213 m protein = 4 x .213 m .
cals given by .169 m fat = 9 x .169 m .
4 x .213 m + 9 x .169 m = 350
.852 m + 1.521 m = 350
2.373 m = 350
m = 147.5 grams Ans
Which of the following describes the characteristics of a plasma? (3 points) a Particles are packed closely together, have low compressibility, and usually maintain their organized, set shape. b Particles are positively and negatively charged, have high compressibility, and spread out to fill a container. c Particles move around in a semi-organized way, take the shape of a container, and fill a container from the bottom up. d Particles move freely, have high compressibility, and spread out evenly to fill a container.
Answer:
The correct option is;
b. The particles are positively and negatively charged, have high compressibility, and spread out to fill a container
Explanation:
Plasma are gases that contain positively and negatively charged particles. Therefore, plasma flow drift in space such that plasma. like gases has no characteristic shape or volume but takes the shape and fills the entire volume of a container in which it is placed
Other characteristics of plasma are that plasma is a conductor of electricity and magnetic fields can therefore exist in plasma due to the fact that plasma are made of atoms in which part or all of the electrons have been removed leaving the ions to roam freely in a container.
each electron in an atom has a charge of -1 and each proton has a charge of 1. what is the overall charge of atom that contains 2 electron and 2 proton
Answer:
0
Explanation:
Positive Change of 2 cancels the negative charge of 2
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The overall charge of atom that contains 2 electron and 2 proton is zero.
Therefore, the overall charge of atom that contains 2 electron and 2 proton is zero.
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Which of the following equations best describes the energy at point C.
assuming energy is conserved?
OA. PEA = KEC
O B. PEA = KEc+PEC
OC. PER = KEc+ PEC
OD. PEB = PEC
Answer:
B. PEA = KEC. +PEC
Explanation:
From the figure it is clear that there is interconversion between potential energy ( PE ) and kinetic energy ( KE ) , so that total mechanical energy is conserved .
At A only potential energy exists . Kinetic energy is zero .
At B only kinetic energy exists . Potential energy is zero .
At C both potential and kinetic energy exist .
So Potential energy at A is equal to potential energy at C and kinetic energy at C
Ie , PEA = KEC + PEC .
Option B is correct .
what is the mass of 5.3 litres of carbon dioxide gas at STP
Answer:
Explanation:
given volume =5.3 litres
as we know that 1 litre =1 dm3
therefore 5.3 litres =5.3 dm3
now moles =given mass /molar mass
so mass =moles*molar mass
in order to find mass of carbon we need to find moles
therefore moles=given volume/standard volume standard volume at STP is 22.4 dm3
moles= 5.3/22.4
moles=0.236=0.24
now mass of carbon dioxide =moles*molar mass
mass = 0.24*44
mass=10.56kg
12 Calculate An object has a mass of 77 kg and
an acceleration of 2.3 m/s2. Use the equation
F=
= ma to calculate the net force acting on the
object. Show your work.
Answer:
F=ma.
mass=77, acceleration=2.3.
77×2.3=177.1Newton
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, calculate the mass in grans of the cylinder. (Assume pi=3.14
Answer:
we use: V = pi*(r^2)*h
V = 3.14*(12.0cm^2)*44.0 cm
V = 19895.04 cm^3
Therefore, mass = (8.90g/cm^3) * (19895.04 cm^3) = 177065.856 g
Explanation:
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, the mass of the cylinder is 180687.62g
What is density?Density is defined as the degree to which a material is packed together.
It is also defined as the measurement of the relative "heaviness" of objects with a fixed volume.
It is mass per unit volume.
Volume = ∧r²h
Volume = 3.14 x 12² x 44.9
= 20301.98 cm³
Density = mass / volume
So, mass = density x volume
= 8.90 g/cm³ x 20301.98
= 180687.62 g
Thus, a copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, the mass of the cylinder is 180687.62g.
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23. A certain sample of nitrogen gas consists of 9.26 1022 nitrogen atoms.
(a) How many moles of N atoms are present in this sample ?
(b) If the gas is entirely in molecular form, how many molecules are present in this
sample?
(c) What is the mass of the sample in gramme?
Answer:
a) 0.154 moles of N2
b) 9.27 × 10^22 molecules
c) 4.312 g
Explanation:
a)
1 mole of N2 contains 6.02 × 10^23 atoms
x moles of N2 contains 9.26 × 10^22 atoms
x= 9.26 ×10^22/6.02 × 10^23
x= 1.54 ×10^-1
x= 0.154 moles of N2
b)
1 mole of N2 contains 6.02 × 10^23 molecules
0.154 moles of N2 contains 0.154 moles × 6.02 × 10^23 = 9.27 × 10^22 molecules
c)
Molar mass of the nitrogen gas= 28 gmol^-1
Number of moles of nitrogen gas = 0.154 moles
Number of moles = mass/molar mass
0.154 moles= mass/28 gmol^-1
Mass= 0.154 moles × 28gmol^-1
Mass= 4.312 g
Which statement regarding serum magnesium (Mg ++) is true? (Select all that apply.) Alcohol-related diseases frequently cause low Mg+ levels. Vomiting is not generally seen as a major cause of Mg+ loss. Mg++ levels present similarly to calcium (Ca++) levels in the blood. Mg+ deficiencies often result in low serum potassium (K+) levels. Mg+ deficiencies must be treated before potassium (K+) deficiencies.
Answer:
-
Alcohol-related diseases frequently cause low Mg+ levels.
- Mg+ deficiencies must be treated before potassium (K+) deficiencies.
- Mg+ deficiencies often result in low serum potassium (K+)
- Mg++ levels present similarly to calcium (Ca++) levels in the blood.
- Vomiting is not generally seen as a major cause of Mg+ loss
Could somebody please help this is really hard
Answer:
The answers to your questions are given below
Explanation:
1. 3 Na2SO4
Molecules of Na2SO4 = 3
Na (sodium) = 3 x 2 = 6
S (sulphur) = 3 x 1 = 3
O (oxygen) = 3 x 4 = 12
2. 4 Pb(NO3)2
Molecules of Pb(NO3)2 = 2
Pb (lead) = 4 x 1 = 4
N (nitrogen) = 4 x 2 x 1 = 8
O (oxygen) = 4 x 3 x 2 = 24
Wk-14
Date
Page
Assignment
1. Calculate the percentage of iron in K3 Fe (CN)
[K= 39, Fe =56, C= 12, N =14]
Answer:
The mass percentage of iron in [tex]\rm K_3[Fe(CN)_6][/tex] (potassium ferricyanide) is approximately [tex]17\%[/tex].
Explanation:
Start by finding the formula mass of potassium ferricyanide, [tex]\rm K_3[Fe(CN)_6][/tex], using relative atomic mass data from the question:
[tex]\begin{aligned} & M(\mathrm{K_3[Fe(CN)_6]}) \\ &\approx 3 \times 39 + 56 + 6 \times (12 + 14) \\ &= \rm 329 \; g \cdot mol^{-1}\end{aligned}[/tex].
In other words, every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units have a mass of approximately [tex]329\; \rm g[/tex].
On the other hand, note that there is one iron [tex]\rm Fe[/tex] atom in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. Hence, there would be exactly one mole of iron atoms in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. The mass of that one mole of iron atoms is approximately [tex]56\; \rm g[/tex] (again, from the relative atomic mass data of the question.)
Therefore:
[tex]\begin{aligned}& \text{Mass percentage of $\mathrm{Fe}$ in $\mathrm{K_3[Fe(CN)_6]}$} \\ &= \frac{\text{Mass of $\mathrm{Fe}$ in one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}{\text{Mass of one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}\times 100\% \\ &= \frac{M(\mathrm{Fe}) \times (\text{Number of $\mathrm{Fe}$ atoms in each $\mathrm{K_3[Fe(CN)_6]}$ formula unit)}}{M(\mathrm{K_3[Fe(CN)_6]})} \times 100\%\end{aligned}[/tex]
[tex]\begin{aligned}&\approx \frac{1 \times 56\; \rm g \cdot mol^{-1}}{329\; \rm g \cdot mol^{-1}}\end{aligned}[/tex].
What gas makes up 73% of earth's atmosphere?
Answer: nitrogen
Explanation:
What is 745000 nanometers converted to millimeters?
Answer:
0.745 millimiters
i looked it up on google and this is the right answer
Calculate the answers to the appropriate number of significant numbers
32.567
135.0
+ 1.4567
—————
Answer:
32.567+135.0+1.4567=169.027
to significant figures is 16
Which statement accurately describes the universe?
Answer: The universe consists of all the energy made by the Sun and stars. The universe consists of all physical objects on Earth and in space. The universe consists of all matter and energy. The universe consists of solar systems which contain galaxies.
Explanation: That's because the Universe does consists of all the energy made by the Sun and Stars. That is how we get our energy is from the Sun and Stars, and the Solar System contains Galaxies.
In order to survive, plants absorb sunlight, water, and nutrients from the soil. 1. Does this represent a physical or chemical change? 2. Justify why this is this type of change. What property is this?
How many sig figs does the answer to the following calculation have?
1.90 + 2.3 +5.700 = ?*
Answer:
The answer is 2 significant figures.
1.90+2.3+5.700=9.9
25,000cg is equal to _g
Answer:
250 g
Explanation:
Two Nitrogen atoms bonded together is what? *
O Atom
O Molecule
Help me please
Why the bromine and air can mix together?
A. Bromine is denser than air
B. Bromine is lighter than air
C. Bromine molecules moved upwards and molecules in air moved downwards
D. Molecules in bromine and air moved randomly
Chooses the correct statement from the above
Answer:
D. Molecules in bromine and air moved randomly
Explanation:
The molecules of both bromine and air are in the gas phase.
Since the molecules of gases are far apart and moving randomly, the bromine and air molecules can easily mix together.
A is partially correct. bromine is denser than air, but that doesn't explain why they mix.
B is wrong. Bromine is denser than air.
C is partially correct. The molecules of bromine and air moved upwards and downwards, but the also moved randomly in many other directions.
can you pls tell me the word equations for all these equations
Answer:
Below
Explanation:
Balanced form;
[tex]2C_6H_6 +15O_2 -> 12CO_2+6H_2O\\\\ Ca_3(PO_4)_2 +8C -> Ca_3P_2 +8CO\\\\2HNO_2+O_2 -> 2HNO_3\\\\Ca(OH)_2 + CO_2 -> CaC0_3+H_2O\\\\2K +Br_2 ->2KBr\\\\2NaOH+FeSO_4 -. Na_2SO_4 +Fe(OH)_2[/tex]
1.Benzene + Dioxygen = Carbon Dioxide + Water
2.Tricalcium phosphate +Carbon = Calcium phosphide + carbon monoxide
3.Nitrous acid react with oxygen to produce nitric acid.
4.This means that the carbon dioxide and limewater react to produce calcium carbonate and water.
5.Potassium react with bromine to produce potassium bromide
6. An aqueous solution of ferrous sulphate reacts with aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in the solution.
You are attempting to determine the thermodynamic properties of an unknown compound. You’ve already determined delta H fusion to be 5.56 kJ/mol and delta H vaporization to be 21.99 kJ/mol. In one of these previous experiments, 2.56 g of this compound was placed in a glass bulb and vaporized by placing the glass bulb into 200. g of hot water initially at 68.25 degrees Celsius, which resulted in a final water temperature of 67.91 degrees Celsius. You are now attempting to determine the enthalpy of solution of this compound. To this end, you dissolve 55.6 g of this compound in 495 g of water initially at 25.2 degrees Celsius. The final temperature of the solution is 19.4 degrees Celsius. What is the enthalpy of solution of this compound in kJ/mol?
Answer:
The heat of solution of the compound = 42.75 kJ/mol
Explanation:
Here we have;
The heat of vaporization = 21.99 kJ/mol
2.56 g of the compound is then placed in 200 g. of water
The temperature of the water reduces from 68.25°C to 67.91°C
The specific heat capacity of water = 4.19 kJ/kg = 4.19 J/g
Mass of the water = 200 g
Heat lost by the water ΔH = m × c × Δθ = n × ΔH vaporization of the compound
Where;
m = The mass of the water = 200 g
c = The specific heat capacity of water = 4.19 kJ/kg = 4.19 J/g
Δθ = The change in temperature = 68.25°C - 67.91°C = 0.34°C
n = The number of moles of the compound
ΔH = m × c × Δθ = 200×4.19×0.34 = 284.92 J = 0.28492 kJ
∴ n × ΔH vaporization of the compound = 0.28492 kJ
n = 0.28492 kJ/( ΔH vaporization of the compound) = 0.28492/21.99≈0.013 moles
∴ 2.56 g = 0.013 moles
1 mole = The molar mass of the compound = 2.56/0.013= 197.6 g/mol
Therefore;
The number of moles in 55.6 g of the compound = 55.6/197.6 = 0.2814 moles
The heat given by the water = ΔH = 495 × (25.2 - 19.4) × 4.19 = 12029.49 J
Therefore;
0.2814 × ΔH(solution) = 12029.49 J = 12.02949 kJ
ΔH(solution) = 12.02949/0.2814 = 42.75 kJ/mol
The heat of solution of the compound = 42.75 kJ/mol.