Answer:
the steel knife, because it's metal.
A) 400 gramos de disolución al 6 % m/m. R: 24 g sto. Y 376 g ste. b) 56 gramos de disolución al 30 % m/m. R: 16,8 g y 39,2 g c) 450 gramos de disolución al 10 % m/m R: 45 g y 405 g d) 200 gramos de disolución al 5 % m/m R: 10 g y 190 g e) 450 gramos de disolución al 20 % v/v R: 90 mL y 360 mL f) 980 mL de disolución al 25 % v/v R: 245 mL y 735 mL. g) 50 mL de disolución al 30 % v/v R: 15 mL y 35 Ml
Answer:
A) 24g soluto y 376g solvente.
B) 16.8g soluto y 39.2g solvente
C) 45g soluto y 405g solvente
D) 10g soluto y 190g solvente
E) 90mL soluto y 360mL solvente
F) 245mL soluto y 735mL solvente
G) 15mL soluto y 35mL solvente
Explanation:
El porcentaje masa/masa (% m/m) se define como la masa de soluto presente en 100g de solución (Soluto + solvente).
De la misma manera, el porcentaje volumen/volumen se define como el volumen de soluto en 100mL de solución:
A) 400 gramos de disolución al 6 % m/m.
400g solución * (6g soluto / 100g solución) = 24g soluto
400g solución - 24g soluto = 376g solvente
b) 56 gramos de disolución al 30 % m/m.
56 gramos de disolución al 30% m/m.
56g solución * (30g soluto / 100g solución) = 16.8g soluto
56g solución - 16.8g soluto = 39.2g solvente
c) 450 gramos de disolución al 10 % m/m
450 gramos de disolución al 10% m/m.
450g solución * (10g soluto / 100g solución) = 45g soluto
450g solución - 45g soluto = 405g solvente
d) 200 gramos de disolución al 5 % m/m
200 gramos de disolución al 5% m/m.
200g solución * (5g soluto / 100g solución) = 10g soluto
200g solución - 10g soluto = 190g solvente
e) 450 mL de disolución al 20 % v/v
450 mL de disolución al 20% m/m.
450 mL * (20mL soluto / 100mL solución) = 90mL soluto
450mL solución - 90mL soluto = 360mL solvente
f) 980 mL de disolución al 25 % v/v
980 mL de disolución al 25% m/m.
980 mL * (25mL soluto / 100mL solución) = 245mL soluto
980mL solución - 245mL soluto = 735mL solvente
g) 50 mL de disolución al 30 % v/v
50 mL de disolución al 30% m/m.
50 mL * (30mL soluto / 100mL solución) = 15mL soluto
50mL solución - 15mL soluto = 35mL solvente
-Carbon and Oxygen combine to from carbon dioxide
Answer:
Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12:16 and 12:32.
Of the following which atom pairs will form covalent bonds
Answer:
si and p
o and F
Explanation:
covalent bonds are formed between non metals
1 cannot be accepted as Na is a metal
3 cannot be accepted as Ca is a metal
5 cannot be accepted as Mg is a metal
what has changed in the atmosphere that give the rock strata the appearance of rust?(red/orange color).
Answer:
Explained below.
Explanation:
What has changed in the atmosphere is that oxidation has occurred where an oxidizing chemical specie has reacted with an oxygen containing compound.
Now these chemicals when they react with rain and fall on rocks react with the rocks to weaken them in a process known as chemical weathering.
Now when this weathering from the oxidizing chemicals from the rain react with rocks that contain iron, it leads to the rock having an appearance of rust.
A few Critical Thinking questions/creativity on the topic 'Particles of matter are very small'
Answer:
Any substance which occupies space and has mass is known as matter. States of matter: Matter exist in three different states that are Solid, Liquid and Gas. Matter is made up of very small particles
Explanation:
If 20. milliliters of 1.0 M HCl was used to completely neutralize 40. milliliters of an NaOH solution, what was the molarity of the NaOH solution?
A) 0.50 M B) 2.0 M C) 1.5 M D) 4.0 M
Answer:
a)0.50
Explanation:
took one for the team :
Please help i forgot how to do this
Answer:
2 significant figures
Explanation:
0.19312
0.19 or 0.2
Find the hydroxide ion concentration [OH-] of an HCl solution with a pH of 6.93.
Answer:
[OH-] = 1.8 x 10^-7
Explanation:
pH + pOH = 14 --> 6.93 + pOH = 14 *subtract 6.93 from both sides
pOH = 7.07
-->
10^pH => 10^-6.93 => 1e - 6.93 [H+]
-->
H+ x OH- = 1 x 10^-6.93 *divide H+ from both sides
-->
[OH-] = 1.17 x 10^-7 or 1.8 x 10^-7
Name the planet: Until recently, this stormy, blue-colored planet had a great dark spot on it, which was a high pressure cyclone.
Answer:
Explanation:
THE PLANET NAME IS NEPTUNE
Circle the solution with the highest concentration
a. 5.0M
c. 0.6M
b. 1.0M
d. 0.75M
Answer:
answer is option a..............
HELP ASAP PLEASE CHEMISTRY
The rate of reaction was measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would you expect after another 3 seconds?
The rate would be lower, and the concentration of products would be higher.
The rate would be lower, and the concentration of products would be lower.
The rate would be higher, and the concentration of products would be higher.
The rate would be higher, and the concentration of products would be lower.
Answer:
The rate would be higher, and the concentration of products would be lower.
Explanation:
The correct answer is The rate would be lower, and the concentration of products would be higher.
The rate of reaction refers to the speed with which reactants are converted into products.
The rate of reaction decreases as the reaction progresses because more reactants are being converted into products.
As such, the reactant concentration decreases and the concentration of products increases.
Hence, after three seconds, the rate would be lower, and the concentration of products would be higher.
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I have a flask filled with water and on top a stopper .
I heat it over a flame .
after some time what will happen to the stopper
Answer:
A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.

The typical design of a Thermos brand vacuum flask, used for maintaining the temperature of fluids such as coffee.

Laboratory Dewar flask, Deutsches Museum, Munich

Diagram of a vacuum flask

A cryogenic storage dewar of liquid nitrogen, used to supply a cryogenic freezer
Vacuum flasks are used domestically, to keep beverages hot or cold for extended periods of time, and for many purposes in industry.
pls make me as brainliest
Juan Carlos placed 35 grams of ice into a dry, 200-gram container. The top
of the container was attached tightly. When the ice was completely melted, the
student measured the mass of the container with the liquid water. What should the
mass of the liquid water in the container be?
A. 35 grams
B. 165 grams
C. 200 grams
D. 235 grams
Mass of the liquid water in the container is 35 grams-
Mass doesn't depends upon the state of compounds.The mass of the liquid water in the container should be 35 grams.
Mass would not change during a change of state because the number of particles does not change during a state change. It does not matter if a substances freezes, boils, melts, sublimates.
So, the mass of liquid water in the container is the same as ice. Hence, the correct option is (A).
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Which of the following elements has the lowest electron affinity?
a. Si
b. F
c. Cl
d. K
Answer:
k
Explanation:
electron affinity (EA) depends on various factors like effective nuclear charge (enc) , size of the atom, ellipticity of sub-shell (ep) , nature of configuration.
more is the enc more will be the EA
more is the size less will be the EA
more valance shell ellipticity (closer to the nuclei) more will the EA ( all given element posses P orbital in the valance shell)
Water flows more easily than syrup, which means water has
A. higher viscosity than syrup
B. lower viscosity than syrup
C. equal viscosity to syrup
Answer:
lower viscosity than syrup
Answer:
higher viscosity than syrup flows more easily than syrup.
Please give me Brainliest answer
What two things combine with oxygen to form ground-level ozone?
A) NOx and ODS
B) CFCs and halons
C) NOx and VOC
D) HFCs and HCFCs
Answer:
c) NOx and VOC
oxides of nitrogen (NOx) and volatile organic compounds (VOC)
Explanation:
-
16) What is the acceleration of an object with a mass of 31.5 kg when an unbalanced force
of 223 N is applied to it?
Answer:
a= 7.07 m/s^2
Explanation:
Newton's second law of motion states that the acceleration of an object is produced by the net force.
the formula to calculate the force: F=ma
you just rearrange it to solve for a
a= F/m a=223/31.5
=7.07
Which statement about hydrocarbons is FALSE?
a
The number one use of hydrocarbons is as a fuel
source.
b
Most hydrocarbons we use today come from
sustainable, renewable sources.
с
Hydrocarbons are useful in industries from
transportation to road work to cosmetics.
d
The bulk of hydrocarbons we use today were
formed hundreds of millions of years ago.
Answer:
b
Explanation:
Hydrocarbons provide 84% of the world's energy, but they are non-renewable. Hydrocarbons are the most economic form of energy.
What is the difference between light photons and infrared photons?
Answer:
Light Photons: Light behaves mainly like a wave but it can also be considered to consist of tiny packages of energy called photons. Photons carry a fixed amount of energy but have no mass. The energy of a photon depends on its wavelength: longer wavelength photons have less energy and shorter wavelength photons have more.
Infrared photons: Infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat. A remote control uses light waves just beyond the visible spectrum of light—infrared light waves—to change channels on your TV.
On the electromagnetic spectrum, visible light has a wavelength that falls between 380 nm and 750 nm, whereas infrared light, which marks the beginning of the non-visible spectrum, has a wavelength that falls between 700 nm and 1 mm. Because of this, infrared can only be viewed with specialized tools like security cameras.
What is infrared light ?A type of radiant energy that we experience as heat, but that is invisible to human eyes is infrared radiation (IR), often known as infrared light. The sun and fire are two of the most prominent sources of IR radiation, however all objects in the cosmos release some of it.
The energy of the photons determines the various types of radiation, starting with radio waves with low energies. In comparison to visible, ultraviolet, X-ray, and gamma ray photons, which are the most energetic of all, microwave photons have somewhat higher energy. Infrared photons have even more energy.
Cooler objects produce lower energy, longer wavelength photons, while hotter ones release higher energy, shorter wavelength photons.
Thus, On the electromagnetic spectrum, visible light has a wavelength that falls between 380 nm and 750 nm, whereas infrared light.
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what element does HgNo
Answer:
Mercury is a chemical element with symbol Hg and atomic number 80. Classified as a transition metal, Mercury is a liquid at room temperature.
...
Explanation:
Answer:
Mercurous nitrate!
which of the following does not contain a covalent bond ( please answer asap!! )
Answer:
Option 4
Explanation:
What is the major difference, in terms of weathering type, between Albany, NY and Washington, D.C.? What might explain this difference?
The breakdown or dissolution of rocks and minerals of the planet's surface is called weathering it can be chemical, biological or physical.
Chemical weathering occurs in regions with high rainfall and high temperature.
In Albany, NY the temperature is 9°C with 98 cm rainfall while in Washington, DC the temperature is 15°C with 111 cm rainfall that is Washington is hotter compared to Albany so it will have chemical weathering.Water (rainfall) and temperature is the main cause of weathering as they loosen and breaks the mineral of rock surfaces.The rocks and minerals get dissolved in the water bodies because of erosion by which they get carried in oceans.Therefore, Albany will have mechanical while Washington will suffer from chemical weathering.
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The total pressure of an 02-Ar-He gas mixture is 755 mmHg. If the partial pressure of Ar is 174 mmHg
and the partial pressure of He is 389 mmHg,
then the partial pressure of 02 is what?
In a neutral solution, the concentration of H+ is
Group of answer choices
Answer:
equal to [OH-]
Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−)
What is the mass of 34.6 L of oxygen? How many molecules of oxygen are in 34.6 L of oxygen?
Answer:
49.4 grams; 9.29 x 10^23 molecules O2
Explanation:
In order to solve for the mass of oxygen, you first must find out how many moles of oxygen there are in 34.6 L.
There are 22.4 L in one mole of gas, so to get amount of moles, divide 34.6 by 22.4.
34.6 / 22.4 = 1.544 mol
In order to calculate mass, multiply the amount of moles by the molar mass of oxygen, which is in this case 32.00 g/mol.
1.544 * 32.00 = 49.4 grams
To calculate the amount of molecules, multiply the amount of moles by Avogadro's number, 6.02 x 10^23, which basically represents how many atoms/molecules there are in a mole of any substance.
1.544 * (6.02 x 10^23) = 9.29 x 10^23 molecules O2
A 125 ml sample of gas is at STP how many moles of gas are in the sample
Answer:
5.58*10⁻³ moles of gas are in the sample.
Explanation:
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Being 1000 mL equivalent to 1 L, then 125 mL is equal to 0.125 L. Then you can apply the following rule of three: if by STP conditions 22.4 L are occupied by 1 mole, 0.125 L are occupied by how many moles?
[tex]amount of moles=\frac{0.125 L*1 mole}{22.4 L}[/tex]
aomunt of moles= 5.58*10⁻³ moles
5.58*10⁻³ moles of gas are in the sample.
Answer:
5.58×10⁻³ moles of gas
Explanation:
There is a rule that says, that 1 mol of any gas, at STP is contained at 22.4L of volume.
We can apply a conversion factor
0.125 L . 1 mol / 22.4 L = 5.58×10⁻³ moles
Notice we converted volume from mL to L
We can also aply the Ideal Gases Law.
At STP we have 1 atm of pressure and 273.15K of T°
We replace data: 0.125 L . 1 atm = n . 0.082 . 273.15K
(0.125 L . 1 atm) / (0.082 . 273.15 K) = n
n = 5.58×10⁻³ moles
Fusion reactions power the _____ in space. Humans currently use fusion in _____ , but researchers are seeking more applications.
Answer:
Sun and the stars, nothing humans don't use fusion at all
Explanation:
Nuclear fusion reactions power the sun in space. Humans currently use fusion in nuclear weapons by means of nuclear reactions, but researchers are seeking more applications.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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Which is true for a substance that releases energy?
OA. The energy release decreases the molecular motion and the kinetic energy of the substance.
B. The energy release decreases the molecular motion but increases the kinetic energy of the substance.
C. The energy release increases the molecular motion and the kinetic energy of the substance.
D. The energy release increases the molecular motion but decreases the kinetic energy of the substance.
E. The energy release is used only to change the state of the substance.
Tides are the rise and fall of surface levels of Earth's ocean water caused by the gravitational effects of which two celestial objects?
A)stars and planets
B)comets and meteors
C)earthquakes and volcanoes
D)moon and sun
Answer:
D)Moon and sunExplanation:
Because the gravitational pull of the moon is weaker on the far side of the Earth, inertia wins, the ocean bulges out and high tide occurs.
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In sexual reproduction, if each chromosome in a pair has the same genes, how is genetic variety possible?
Answer:
The same genes or slightly different versions of the same gene can be found on each chromosome in a pair. They form a line and split off bits of themselves, which they barter with one another. In sexual reproduction, crossing over is the first method that genes are shuffled to develop genetic variation.