Freezing point depression is when a substance must be colder than normal in order to freeze.
Freezing point is that temperature where a liquid substance becomes a solid i.e. freezes. Freezing point depression is the process whereby the temperature at which a substance freezes is lowered.Freezing point depression often occurs when a solute is added to a solvent. This reduces its freezing point. Since temperature is reduced, in other words, this means that the substance must become colder than normal for it to start freezing.
Hence, freezing point depression is when a substance must be colder than normal in order to freeze.
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D. When a substance must be colder than normal in order to freeze.
Explanation:
hey love, I just took the quiz on this for founder's education. I hope this helped.
aquien le elimina las respuestas
Which of these is a chemical property of a substance?
Answer:
A chemical property is a characteristic of a substance that may be observed when it participates in a chemical reaction. Examples of chemical properties include flammability, toxicity, chemical stability, and heat of combustion
Who discovered how gravity affects objects on Earth quizlet?
Answer:
Gravity, Isaac Newton discover
Based on the Lewis/electron dot representation
of the two atoms, predict the ratio of metal
cationic (+) atom to nonmetal anionic (-) atom in
the compound.
.Ca.
.P.
A. 1:1
B. 3:2
C. 2:1
D. 3:1
Can someone plz tell me how to do this.
Answer:
B or C think so
If a photon dropping from the n = 7 to the n = 1 level hit the surface of Ag, what would be the wavelength of the ejected electron in inches?
Answer:
366 inches
Explanation:
From;
1/λ = RH(1/nf^2 - 1/ni^2)
Given that;
nf= 1, ni= 7, RH= Rydberg constant for hydrogen
1/λ = 1.097 × 10^7(1/1^2 - 1/7^2)
1/λ = 1.097 × 10^7(1 - 0.02)
λ = 9.3 × 10^-8 m or 366 inches
Write the correct IUPAC name for each of the following structures (3 marks per
structure, 1 mark deduction per error):
Answer:
Methyl group
Explanation:
From the diagram shown, we can see that the family group CH3 is attached to the structure.
This is simply called a methyl group because it is derived from me than and written that way to show the direct bonding between carbon and the 3 hydrogen atoms.
The flask was placed in a water bath for the entire duration of the experiment. The purpose of this was to___.
A. heat up the flask to maximize the gas pressure
B. cool down the flask to maximize the gas pressure
C. keep the temperature constant so the collected
gas will not expand
Answer:
C. keep the temperature constant so the collected gas will not expand
Explanation:
A water bath is an instrument in the laboratory used for controlled temperature experiment. It is used to maintain a constant temperature of volume of samples of water, air or chemicals. It consist of water being heated at a regulated and required temperature. Where the volume of the sample is placed in the water bath during an experiment so as to avoid unnecessary expansion of the sample.
In the question given, the purpose of putting the flask in a water bath during the experiment is to ensure that the content of the flask is at a constant temperature and avoid unnecessary expansion. Thus the correct option is C.
why do scientists classify living things? ( I need 4 reasons why) thank you take care x
Answer:
1. To be able to easily name organisms
2. To ease communication among scientists
3. To give knowledge about the broad variety of organisms
4. To make the study of organisms easier
To begin the experiment, Xavier washed his hands and put on safety goggles. He then measured 120 milliliters of tap water, 2.5 milliliters of baking soda, and 2.5 milliliters of citric acid. The initial temperature of the water was 23.5°C.
Next Xavier added the baking soda and citric acid to the water. The mixture immediately began to bubble vigorously, which lasted for about 30 seconds. The new temperature of the mixture was 17.7°C.
Is a chemical reaction taking place during Xavier’s experiment? How do you know?
WILL GIVE BRAINLIEST!!!!!!!!!!!!!!!
Answer:
Yes a chemical reaction is taking place.
Explanation:
There is a change in temperature along with bubbling. All signs of a chemical reaction.
helpe pls I will mark brainlest
Answer:
What is the question needing to be answered?
Explanation:
Usually with a scientific hypothesis, you ask the question in an if, then statement. For example: If it rains outside, then the ground will be wet. It's kind of like a cause and effect statement.
- Write equations for (a) the decomposition of carbon monoxide-
co_to produce carbon--and oxygen gas and (b) the synthesis reaction for the formation of carbon monoxide from carbon and Oxygen.
Explanation:
here's the answer to your question about
A free-moving neutron is absorbed by the nucleus of an atom. This can
cause:
A. the protons in the nucleus to begin to search for more protons.
B. the atom to become unstable and rip apart.
C. the bonds in the nucleus to become stronger and release heat.
O D. the atom to absorb more neutrons to balance the protons.
Answer:
the atom to become unstable and rip apart.
Explanation:
We define radioactivity as the spontaneous disintegration of atoms. It could occur naturally or artificially.
Artificial radioactivity occurs either by the process of nuclear fusion (combination of two light nuclei) or nuclear fission(bombarding of a heavy nucleus with a small particle such as a neutron).
When a heavy nucleus is bombarded with a neutron, the nucleus becomes unstable and rips apart producing a daughter nucleus/nuclei and more neutrons hence the process continues. This is otherwise called a chain reaction.
What happen when:
a. Magnesium Burns in oxygen.
b. Calcium carbonate is heated.
c. Hydrogen reacts with nitrogen at necessary condition.
d. potassium hydroxide reacts with nitric acid.
e. Carbon dioxide is treated with limewater.
Please help me to do this problem.
a. Magnesium Burns in oxygen.
--⟩it produces light bright enough to blind you temporarily.
b. Calcium carbonate is heated.
--⟩ form calcium oxide and evolve carbon dioxide gas.
c. Hydrogen reacts with nitrogen at necessary condition.
----⟩some of the hydrogen and nitrogen will react to form ammonia.
d. potassium hydroxide reacts with nitric acid.
---⟩When potassium reacts with nitric acid then, potassium displace hydrogen from its solution and becomes colorless liquid.
e. Carbon dioxide is treated with limewater.
---⟩to form a white precipitate (appears milky) of calcium carbonate, CaCO 3.
Hope it is helpful to you
The diagram shows three isotopes. What element is represented?
hydrogen
helium
lithium
Answer:
The diagram shows three isotopes. What element is represented?
A. hydrogen
B. helium
C. lithium
A. hydrogen
A. Is The Correct Answer
In an experiment, a student wants to increase the rate of a reaction that involves gases. Which change to the
reactants would accomplish this?
Increase the volume to decrease pressure and to increase concentration.
O Increase the volume to increase pressure and to decrease concentration.
O Decrease the volume to decrease pressure and to increase concentration.
O Decrease the volume to increase pressure and to increase concentration.
Answer:
Decrease the volume to increase pressure and to increase concentration.
Explanation:
Increasing the concentration will increase the number of collisions per second and therefore the rate of reaction.
Pls mark me as brainliest.
Answer:
The last option: Decrease the volume to increase pressure and to increase concentration.
Explanation:
You can support your choice on basis of the collision theory. According to the collision theory, chemical reactions happen when the molecules collide with each other, in the correct orientation and with enough kinetic energy to overcome the activation energy. As a consequence, the larger the number of collisions the larger the rate of a reaction. In the case of a reaction that involves gases, decreasing the volume will increase the pressure and the concentration (volume is inversely related to both the pressure and the concentration) causing the molecules to be closer to each other and to collide with higher frequency, this is you will expect more collisions, and so an increase on the rate of the reaction. That is expressed by the last choice: decrease the volume to increase pressure and to increase concentration.
when carbon is heated in a limited supply of oxygen, a gas is obtained.
1 .what is the name of this gas
Answer:
carbon monoxide
I think its correct but I am not sure
Answer: when carbon is heated in air carbon dioxide is formed, so is incomplete combustion which results in carbon monoxide.
Explanation: but when carbon dioxide reacts with more oxygen carbon monoxide is formed i guess.
I AM A BIT SURE BUT HOPE THIS HELPSSSS!!!!
At a distance of more than three feet from gun to target, there will generally not be signs of gunpowder on the target.
True
False
What is the product of the unbalanced equation below?
Al(s) + Br2(g) →
The Periodic Table
O A. Al(s) + Br2(g)
B. AlBr(s)
C. Al2Br3(s)
O D. AlBr3(s)
Answer:
D
Explanation:
The answer is D. I'm not sure that it is a solid. I don't think it is a ppte, which is the only way it can be a true solid. It is ionic if the reaction is taking place in water and there is someway to start the reaction. Be that as it may, the internal balace numbers of the chemical produced is the only possible answer. The balanced eq;uatioon is
2Al + 3Br2 ==> 2AlBr3
3. ¿Cuál de las siguientes operaciones es correcta para calcular el número de moles de hidrógeno necesarios para producir 6 moles de NH3 según la siguiente ecuación? 3H2+N2-> 2NH3 pliss necesito ayuda :(
a)6molesNH3 x2molesNH3 /3molesH2
b) 6molesNH3 x3molesNH3 /2molesH2
c)6molesNH3 x3molesH2 /2molesNH3
d) 6 moles NH3 x 2 moles H2 / 3 moles NH3
Answer:
the answer is d that is 6×2/3
A sample of 17.0 M concentrated H2SO4 stock solution with a volume of 25.0 cm3 was diluted to final concentration of 5.0 M H2SO4 solution. Calculate, what is the amount of water that would be required to dilute the concentrated H2SO4 solution to a final concentration of 5.0 M?
Answer:
60 cm³ of water
Explanation:
We'll begin by calculating the volume of the diluted solution. This can be obtained as follow:
Concentration of stock solution (C₁) = 17 M
Volume of stock solution (V₁) = 25 cm³
Concentration of diluted solution (C₂) = 5 M
Volume of diluted solution (V₂) =?
C₁V₁ = C₂V₂
17 × 25 = 5 × V₂
425 = 5 × V₂
Divide both side by 5
V₂ = 425 / 5
V₂ = 85 cm³
Thus, the volume of the diluted solution is 85 cm³
Finally, we shall determine the volume of water needed to dilute the solution. This can be obtained as follow:
Volume of stock solution (V₁) = 25 cm³
Volume of diluted solution (V₂) = 85 cm³
Volume of water =?
Volume of water = V₂ – V₁
Volume of water = 85 – 25
Volume of water = 60 cm³
Therefore, 60 cm³ of water is needed to dilute the solution.
The plasma membrane is made up of a double layer of
Answer: yes
Explanation:
bilayer of lipids, oily substances found in all cells
The structure of copper is described as a lattice of positive ions in a 'sea of electrons'.
Which statements are correct?
1 Copper has a high melting point because of the strong electrostatic attraction
between the positive ions and the 'sea of electrons'.
2 Copper is malleable because the layers of atoms in the lattice can slide over each
other.
3 Copper atoms can be oxidised to form copper ions by losing electrons.
A
1, 2 and 3
B
1 and 2 only
с
1 and 3 only
D 2 and 3 only
Answer:
A
Explanation:
Metal atoms are held together by metallic bonds. The metallic bonds are composed of a lattice of positive ions in a 'sea of electrons'.
The metal atoms are held together by strong electrostatic attraction between the positive ions and the 'sea of electrons' leading to high melting point of metals including copper.
Similarly, when a metal undergoes stress, the layers of the metal roll over each other but the lattice remains in place. Hence for metals such as Copper, layers of atoms in the lattice can slide over each other thereby making the metal malleable.
Metals oxidize by electron loss. Since Copper is metal, it can also be oxidized to form copper ions by loosing electrons.
Using the idea of Dobereiner's triads, what conclusion could have been made about magnesium,
had beryllium and calcium already been discovered?
Answer:
Explanation: Using the idea of Dobereiner's triads, what conclusion could have been made about magnesium,
had beryllium and calcium already been discovered?
Which of these is correct please help
Answer:
NH4+
Explanation:
NH4+ is the acid and NH3 is the base, so NH4+ is the stronger acid.
P +2 Fe +1 N+1 S+6 Mg +2
Answer:
= P + 2eF + N + S + 6gM + 2
Explanation:
Multiply: 1 . N = N
= P + 2eF + N + 1 . S + 6gM + 2
Multiply: 1 . S = S
= P + 2eF + N + S + 6gM + 2
Hope This Helps!
______ exhibits the highest
intermolecular forces of the states of matter.
A. Solid
B. Liquid
C. Gas
D. Vacuum

Why Don't Birds Get Electrocuted When They Land on Electric Wires?
Answer:
Birds are able to sit on electrical power lines because the electrical current essentially ignores the bird's presence and continues to travel through the wire instead of through the bird's body. A bird's body is not a good conductor of electricity.
hope i helped
How many Hydrogen (H) Atoms are in Methylene?
Answer:
FOUR HYDROGEN ATOMS
Explanation:
Two C atoms, four H atoms, and two O atoms can also be arranged to form a methyl formate, which is used in manufacturing, as an insecticide, and for quick-drying finishes. Methyl formate molecules have one of the oxygen atoms between the two carbon atoms, differing from the arrangement in acetic acid molecules.
The Methylene group has 2 hydrogen. -CH2
the valency of both Oxygen and magnesium is 2 give reason
Answer:
the valency of an element is its combining capacity that is the number of electrons it requires to lose, gain or share in order to become neutral.
[ An element can become neutral if it completes it's octet. That is if an element has 8 electrons in it'd outermost shell then it is considered neutral ]
The valence of Magnesium is 2 because it requires to lose 2 electrons to become neutral. whereas, the valence of Oxygen is 2 because it needs to gain 2 electrons to become stable.Hence they both have the same valence.
One may say that oxygen's valence is -2 while that of Magnesium is + 2. It's meaning is still the same but "-" sign indicates that oxygen will be gaining electrons in the process of becoming stable.
Under which conditions do
metamorphic rocks form during regional metamorphism?
Answer:
Under regional metamorphism, metamorphic rocks are formed as a result of transformation of large areas of previously existing rocks under the influence of a large amount of heat and pressure which are created by tectonic forces.
Explanation:
Metamorphism is the phenomenon in the formation of metamorphic rocks whereby rocks are changed by heat and pressure. Now, during this process called metamorphism, rocks are bound to change either physically and chemically into a new rock. Now, there are two types of metamorphism namely;
Contact metamorphism and regional metamorphism.
We are concerned with regional metamorphism and it is defined as metamorphic rocks formed as a result of transformation of large areas of previously existing rocks under the influence of a large amount of heat and pressure which are created by tectonic forces.
