Answer:
low I.E., high I.E
Explanation:
Ionic or electrovalent bonds are interatomic bonds that results from the transfer of electrons between atoms. It is usually between a metal, electron donor, and non-metals which accepts electrons readily.
For an ionic bond to be formed, a large electronegativity difference is required. This suggests that one atom has a large electronegativity value while the other, the donating atom, has a low value of electronegativity. Electronegativity of an element is a property that combines the ability of its atom to lose or gain electrons. So, with respect to electronegativity, atom X would have a low electronegativity value and Y, a very high electronegativity value.
Ionization Energy(I. E) is the readiness of an atom to lose an electron. Most metals have low I.E values and would readily want to lose electrons. This satisfies X. Y in an ionic bond would have a very high I.E value and would not readily want to lose electrons but gain electrons. Y is a non-metal to a large extent.
Answer:
Low I.E of atom X and high I.E of atom Y.
Explanation:
An ionic bond is formed when two ions are formed.
In ionic bond an atom loses electron and the electron is accepted by another atom. The atom losing electron acquires positive charge and the atom gaining electron acquires negative charge.
Now to lose an electron the atom should have low ionization energy (I.E.) and the other atom must not lose electron easily (high I.E.) and should have high electron affinity.
Why does the same side of the moon always face earth? A. The rotational period of earth is the same as that of the moon B. The rotational period of earth is equal to one revolution around earth C The rotational period of the moon is equal to one revolution around earth D. The rotational period of the moon is different than one revolution around Earth
Answer:
A. the rotational period of the earth is the same as that of the moon
Explanation:
I learned about this last year
The rotational period of the moon is equal to one revolution around the earth,so that the same side of the moon always face earth. Hence the option C is correct.
What is Earth?Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers.The rotational period of the moon is equal to one revolution around the earth,so that the same side of the moon always face earth. Hence the option C is correct.
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What is the reaction quotient?
A.It measures the [products] / [reactants]
B.It measures the concentration of the reactants.
C.It measures the concentration of the products.
D.It measures the [reactants] / [products]
Reset
Answer:
A. It measures the [products] / [reactants].
Explanation:
The reaction quotient aids in figuring out which direction a reaction is likely to proceed, given either the pressures or the concentrations of the reactants and the products.It is calculated from the concentration of the products and reactants at mixing up.Reaction quotient (Q) = [products] / [reactants]So, the right choice answer:
A. It measures the [products] / [reactants].
The reaction 2KClO3 (s) ->2KCl (s) + 3O2 (g) is a
Answer:
(C) Decomposition reaction
Explanation:
A decomposition reaction is a chemical reaction in which a single compound breaks down into two or more compounds or elements.
in this example
2KClO₃(s) ->2KCl (s) + 3O₂ (g)Potassium chlorate (KClO₃) decomposed to two smaller compounds KCl and O₂ gas.
So, the right choice is (C) Decomposition reaction
The speed of a note created by a flute will increase as the speed of sound increases. When a marching band goes outside on a cold day, what would you predict would happen to the note played on a flute?
A) It would decrease because the speed of sound and temperature are proportional.
B) It would increase because the speed of sound and temperature are proportional.
C) It would decrease because the speed of sound and temperature are inversely proportional.
D) It would increase because the speed of sound and temperature are inversely proportional.
Answer:
A.
Explanation:
Answer:
A
Explanation:
I just took the usatestprep
What is the concentration of the acid in this titration 1.2 m 2.4 m 1.95 m 0.98 m 1.98 m
Answer:
1.95
Explanation:
Just did the test and it was correct!
Answer: The correct answer is 1.95 M
Explanation:
To calculate the concentration of acid, we use the equation given by neutralization reaction:
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of unknown acid which is HCl.
[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of base which is [tex]Ca(OH)_2[/tex]
We are given:
[tex]n_1=1\\M_1=?M\\V_1=(45.5-0.0)=45.5mL\\n_2=2\\M_2=1.2M\\V_2=(37.5-0.5)=37mL[/tex]
Putting values in above equation, we get:
[tex]1\times M_1\times 45.5=2\times 1.2\times 37\\\\M_1=1.95M[/tex]
Hence, the concentration of unknown HCl solution comes out to be 1.95 M.
What can you conclude about these two reactions based on the chemical equations? Reaction A: 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g) Reaction B: 2H2(g) + O2(g) → 2H2O(g) + energy A. Reactions A and B are both exothermic. B. Reaction A is endothermic, and reaction B is exothermic. C. Reactions A and B are both endothermic. D. Reaction A is exothermic, and reaction B is endothermic.
Answer:
The correct answer is B: reaction A is endothermic and reaction B is exothermic.
Explanation:
A: 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g): is the photosynthesis reaction. Photosynthesis is an endothermic reaction, therefore it needs energy (sunlight) to take place.
B: 2H2(g) + O2(g) → 2H2O(g) + energy: is the formation of water. It is an exothermic reaction which releases energy as a result of the reaction.
So, the answer is option (B): Reaction A is Endothermic and Reaction B is Exothermic.
Answer: Answer: B. Reaction A is endothermic, and reaction B is exothermic
Explanation:
Endothermic reaction is a reaction that absorb energy from its surrounding.
Reaction A : 6H2O(l) + sunlight
Exothermic reaction is a reaction that releases energy to the surrounding.
Reaction B → 2H2O(g) + energy
How would a collapsing universe affect light emitted from clusters and superclusters? A. Light would acquire a blueshift. B. Light wouldn't be affected. C. Light would acquire a redshift. D. Light can't be measured from clusters and superclusters.
Answer:
Choice A: Light would acquire a blueshift.
Explanation:
When a universe collapses, clusters of stars start to move towards each other. There are two ways to explain why light from these stars will acquire a blueshift.
Stars move toward each other; Frequency increases due to Doppler's Effect.
The time period [tex]t[/tex] of a beam of light is the same as the time between two consecutive peaks. If [tex]\lambda[/tex] is the wavelength of the beam, and both the source and observer are static, the time period [tex]T[/tex] will be the same as the time it takes for light travel the distance of one [tex]\lambda[/tex] (at the speed of light in vacuum, [tex]c[/tex]).
[tex]\displaystyle t = \frac{\lambda}{c}[/tex].
Frequency [tex]f[/tex] is the reciprocal of time period. Therefore
[tex]\displaystyle f = \frac{1}{t} = \frac{c}{\lambda}[/tex].
Light travels in vacuum at a constant speed. However, in a collapsing universe, the star that emit the light keeps moving towards the observer. Let the distance between the star and the observer be [tex]d[/tex] when the star sent the first peak.
Distance from the star when the first peak is sent: [tex]d[/tex].Time taken for the first peak to arrive: [tex]\displaystyle t_1 =\frac{d}{c}[/tex].The star will emit its second peak after a time of. Meanwhile, the distance between the star and the observer keeps decreasing. Let [tex]v[/tex] be the speed at which the star approaches the observer. The star will travel a distance of [tex]v\cdot t[/tex] before sending the second peak.
Distance from the star when the second peak is sent: [tex]d - v\cdot t[/tex].Time taken for the second peak to arrive: [tex]\displaystyle t_2 =t + \frac{d - v\cdot t}{c}[/tex].The period of the light is [tex]t[/tex] when emitted from the star. However, the period will appear to be shorter than [tex]t[/tex] for the observer. The time period will appear to be:
[tex]\begin{aligned}\displaystyle t' &= t_2 - t_1\\ &= t + \frac{d - v\cdot t}{c} - \frac{d}{c}\\&= t + (\frac{d}{c} - \frac{v\cdot t}{c}) -\frac{d}{c}\\&= t - \frac{v\cdot t}{c} \end{aligned}[/tex].
The apparent time period [tex]t'[/tex] is smaller than the initial time period, [tex]t[/tex]. Again, the frequency of a beam of light is inversely proportional to its period. A smaller time period means a higher frequency. Colors at the high-frequency end of the visible spectrum are blue and violet. The color of the beam of light will shift towards the blue end of the spectrum when observed than when emitted. In other words, a collapsing universe will cause a blueshift on light from distant stars.
The Space Fabric Shrinks; Wavelength decreases as the space is compressed.
When the universe collapses, one possibility is that clusters of stars move towards each other. Alternatively, the space fabric might shrink, which will also bring the clusters toward each other.
It takes time for light from a distant cluster to reach an observer on the ground. The space fabric keeps shrinking while the beam of light makes its way through the space. The wavelength of the beam will shrink at the same rate. The wavelength of the beam of light will be shorter by the time the beam arrives at its destination.
Colors at the short-wavelength end of the visible spectrum are blue and violet. Again, the color of the light will shift towards the blue end of the spectrum. The conclusion will be the same: a collapsing universe will cause a blueshift on light from distant stars.
Answer:
Light would acquire a blueshift.
Explanation:
Just took the test and got it right.
1.
What would likely happen if you were to touch the flask in which an endothermic reaction were occurring?
The flask would probably feel warmer than before the reaction started.
The flask would probably feel cooler than before the reaction started.
The flask would feel the same as before the reaction started.
Answer:
The flask would probably feel cooler than before the reaction started.
Reasoning:
Endothermic is a process or reaction accompanied by or requiring the absorption of heat
If you were to touch the flask in which an endothermic reaction were occurring, the flask would probably feel cooler than before the reaction started.
Explanation:If you were to touch the flask in which an endothermic reaction were occurring, the flask would probably feel cooler than before the reaction started. This is because an endothermic reaction absorbs heat from its surroundings, including your hand, making it feel cooler. An example of an endothermic reaction is the dissolution of ammonium chloride in water.
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The website of a popular stargazers club notes that on Wednesday the moon will rise at 6:23 PM and set at 6:12 PM on Thursday. What is a mistake in this information?
A) The moon sets before 6:00 PM everyday
B) The setting time should have been 6:12 AM
C) The moon rises only after 9:00 PM everyday
D) It is difficult to predict when the moon would set
It's C that's correct because it's very true...
Answer:
the answer is B
Explanation:
Refrigerator technology now makes it possible to grow and then store food for the winter, as well as ship large amounts of food long distances. How has refrigerator technology changed society? A. Refrigerator technology has helped improve people’s nutrition. B. Refrigerator technology has helped people travel faster. C. Refrigerator technology has allowed people to work throughout the summer. D. Refrigerator technology has helped farmers grow more types of food.
Answer: A. Refrigerator technology has helped improve people’s nutrition.
Explanation:
Refrigeration technology has been transformative for society by enhancing food preservation, enabling long-distance transportation of fresh produce, and thereby improving overall nutrition and food variety available to people. Correct option is A.
Refrigerator technology has significantly changed society by improving how we store, transport, and consume food. With the advent of refrigeration technology, we're able to preserve the quality and nutritional value of food over longer periods and distances, helping to improve global nutrition levels. It's worth noting that refrigeration technology has also led to a greater variety of food being available to consumers, as produce can now be shipped safely across the world, and stored efficiently for later use.
The correct answer to the question of how refrigerator technology has changed society is A. Refrigerator technology has helped improve people’s nutrition.
How does a catalyst increase the rate of a reaction?
A) It decreases the enthalpy change of the reaction.
B) It lowers the potential energy of the reactants.
C) It provides a lower activation energy for the reaction.
D) It raises the potential energy of the products.
Answer: The answer would be C. Please give me a thanks :) bye!
Explanation:
Answer: C) It provides a lower activation energy for the reaction.
Explanation:
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.
The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.
Convert a pressure of 1.75 atm to kPa and to mm Hg
Answer:
Explanation:
1.75atm x 101.3kPa/1 atm
=177kPa
1.75 atm x 760 mmHg/1 atm
=1300 mm Hg
The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.
The correct answer is 1300mmhg
What is pressure?Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure. Various units are used to express pressure.According to the question, the formula is used as
[tex]1.75* 101.3[/tex] =177kPa
1.75 * 760=1300 mm Hg
Hence, the correct answer is 1300mmhg.
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How is the precision of a calculated result related to the precision of the measurement used in the calculation?
Answer:
The precision of a calculated answer is limited by the least precise measurements used in the calculation.
Explanation:
Copper conducts heat well.
physical
chemical
Alcohol has a sweet odor.
physical
chemical
The properties of copper conducting heat well and the sweet odor of alcohol are both physical properties. They describe the state of a physical system and do not indicate a change in the chemical composition of the substances.
Explanation:These properties you referred to are known as Physical Properties. A physical property is any property that is measurable whose value describes a state of a physical system.
The property of copper conducting heat well is a physical property. Metallic copper is highly conductive and allows for the fast transfer of thermal energy, which is a physical change, not a chemical one. It simply changes the temperature, not the chemical structure of the copper.
Similarily, the sweet odor of alcohol is also a physical property, distinct to specific alcohols, for instance, Ethanol. The odor or smell does not alter or define the chemical composition of the alcohol, thus it is not a chemical property.
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What does the principle of uniformitarianism state
Answer:
Explanation:
Uniformitarianism - "The Present is the Key to the Past"
Uniformitarianism is a geological doctrine. It states that current geologic processes, occurring at the same rates observed today, in the same manner, account for all of Earth's geological features. Thus, it assumes that geological processes are essentially unchanged today from those of the unobservable past, and that there have been no cataclysmic events in earth's history. As present processes are thought to explain all past events, the Uniformitarian slogan is, "the present is the key to the past.
Answer:
I hope this helps! <3
Explanation:
What would the potential of a standard hydrogen electrode (S.H.E.) be if it was under the following conditions?
[H+] = 0.88M Ph2= 1.7atm T=298k
Answer:
[tex]\boxed{\text{-8.5 mV}}[/tex]
Explanation:
The SHE is not under standard conditions, so we must use the Nernst Equation, which relates the cell potential to the standard potential and to the activities of the electroactive species.
[tex]E = E^{\circ} - \frac{RT}{zF}lnQ[/tex]
Step 1. Write the equation for the cell reaction
Anode: H₂(1 atm) ⇌ 2H⁺(1 mol·L⁻¹) + 2e⁻
Cathode: 2H⁺(0.88 mol·L⁻¹) + 2e⁻ ⇌ H₂(1.7 atm)
Overall: H₂(1 atm) + 2H⁺(0.88 mol·L⁻¹) ⇌ 2H⁺(1 mol·L⁻¹) + H₂(1.7 atm)
Step 2. Calculate Q
[tex]Q = \frac{1 \times 1.7 }{ 1 \times 0.88} = 1.93[/tex]
Step 3. Apply the Nernst equation
Data:
E° = 0 V
R = 8.314 J·K⁻¹mol⁻¹
T = 298 K
n = 2
F = 96 485 C/mol
Calculation:
[tex]E = 0 - \frac{8.314 \times 298}{2 \times 96 485}\ln1.93[/tex]
= -0.0128 × 0.658
= -0.0085 V
= [tex]\boxed{\text{-8.5 mV}}[/tex]
If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
A.It decreases.
B.It increases.
C.It stays the same.
Answer:
B. It increases.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
It is clear that, at constant P, the volume of the gas (V) is directly proportional to the temperature of the gas.
V ∝ T.
So, If a balloon is heated, the volume of the air in the balloon if the pressure is constant:
B. It increases.
An "arid" climate is very hot and dry.
True | False
Answer:
True
Explanation:
This is true!
Answer:
true
Precipitation (or the lack of) is the main factor that defines Arid climate. To have an Arid climate, an area must receive less than 10 inches of rain per year. However, many areas of arid climate receive far less than that. Some deserts around the world don't receive 10 inches of rain in 10 years!
What is the solute and solvent in an aqueous solution made from sugar and water?
An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a solution of table salt, or sodium chloride (NaCl), in water would be represented as Na+(aq) + Cl−(aq).
Sugar is the solute and water is the solvent.
What is the solution?A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
Solvent: the substance in which a solute dissolves to produce a homogeneous mixture.
Solute: the substance that dissolves in a solvent to produce a homogeneous mixture.
Hence, sugar is the solute and water is the solvent.
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Sodium chloride, NaCl, is formed when a sodium atom transfers its electron to a chlorine atom. The difference in charge between the two atoms creates a(n) ___________ attraction that bonds them together.
A) electrostatic
B) elementary
C) gravitational
D) nuclear
The reaction is extremely exothermic, producing a bright yellow light and a great deal of heat energy.
It is electrostatic attraction as it bonds the two atoms together.
which of the following would improve the experimental design of this investigation? why?
safety goggles
root vegetable, such as a large carrot or potato
two metal forks
an edge or thin wall to freely balance the vegetable on, such as a cardboard box with its flaps taped down
Stay safe! Always wear your safety goggles. Be careful while sticking the forks into the vegetable. If you’re working outside a lab, make sure the area is clean so you can save the vegetable when you’re done.
Part A
Stick a fork into each end of
Need help !!!!! ASAP
The answer is:
Hence, the new pressure will be 2.07 atm.
[tex]P_{2}=2.07atm[/tex]
Why?Since we know that the gas is inside of a rigid container, meaning that the volume will be kept constant, we can solve the problem using the Gay-Lussac's Law.
The the Gay-Lussac's Law establishes that when an ideal gas is kept at constant volume, the pressure and the temperature will be proportional.
We need to pay special attention when we are working with the Gay-Lussac's Law since its equations with absolute temperatures (Kelvin ), so, if we are working with relative temperatures such as Celsius degrees or Fahrenheit degrees, we need to convert the temperatures to Kelvin (absolute temperature)
We can convert from Celsius degrees to Kelvin using the following formula:
[tex]Temperature(K)=Temperature(C\°)+273[/tex]
Then we have the Gay-Lussac's equation:
[tex]\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}[/tex]
Therefore, we are given the following information:
[tex]T_{1}=30\° \\P_{1}=2atm\\T_{2}=40\°[/tex]
Therefore, converting the given temperatures from Celsius degrees to Kelvin, we have:
[tex]T_{1}=30C\°=30+273K=303K\\\\T_{1}=40C\°=40+273K=313K\\[/tex]
Now, calculating we have:
[tex]\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}[/tex]
[tex]P_{2}=\frac{P_{1}}{T_{1}}*T_{2}\\\\P_{2}=\frac{2atm}{303K}*313K=2.07atm[/tex]
Hence, the new pressure will be 2.07 atm.
[tex]P_{2}=2.07atm[/tex]
Have a nice day!
An element is?
A solid form of a substance
A substance only with one type of atom
The smallest particle of an atom
The smallest particle of matter
Answer:
A substance only with one type of atom
Explanation:
took test
How many grams are present in a 5.63 liter container filled with O2 at STP?
At STP,
22.4litre Oxygen=32 g of oxygen
so 1 litre oxygen=32/22.4=1.42 g of oxygen
hence 5.63 litre oxygen=1.42×5.63=7.99 g of oxygen
Which of the following happens during a lunar eclipse?
Select one:
a. Earth casts a shadow on the moon.
b. The moon casts a shadow on Earth.
c. Earth stops revolving in its orbit.
d. Earth starts revolving around the moon.
Answer:
a. Earth casts a shadow on the moon.
Explanation:
Lunar eclipse occurs when Earth comes in between sun and moon. The sunlight falling on moon is blocked by Earth and the shadow of earth falls on moon. This happens on full moon day when sun, earth and moon align in one line.The moon passes through the shadow of earth and appears dark.
Thus, the correct option is a.
Answer:
a
Explanation:
ANSWER FIRST GET BRAINLIEST
Which student is practicing heat and fire safety? A. Akari quickly touches a hot plate to see if it is hot yet. B.Clara leans over the open flame on her lab table. C. Aero leaves his plastic water bottle near a hot plate.D. Brenda picks up a hot beaker with insulated gloves.
Answer:
D
Explanation:
Its D because she had insulated gloves.
Answer:
D. Brenda picks up a hot beaker with insulated gloves.
During natural selection, which organisms are most likely to survive as the environment changes?
Are there any choices to your question? If so what are they? Then I can answer. :)
How much energy would a jeweler need to melt 4.4 g of copper to fix a broken necklace if the copper starts out at 25°C and melts at 1083°C
Answer:
1792 J.
Explanation:
To calculate the energy would a jeweler need, we use the relation:The amount of heat released from Cu = Q = m.c.ΔT.
where, m is the mass of Cu (m = 4.4 g).
c is the specific heat capacity of Cu = 0.385 J/g°C.
ΔT is the temperature difference = (final T - initial T = 1083°C - 25°C = 1058°C).
∴ The amount of heat released from Cu = Q = m.c.ΔT = (4.4 g)(0.385 J/g°C)(1058°C) = 1792 J.
I have 0.725 liters of a 1.500m solution of cacl2. How many grams of cacl2 are in the solution
Answer:
120.7 g.
Explanation:
Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.
M = (no. of moles of solute)/(V of the solution (L)).
∴ M = (mass/molar mass)of NaCl/(V of the solution (L)).
∴ mass of CaCl₂ = (M)(V of the solution (L))(molar mass) = (1.5 M)(0.725 L)(110.98 g/mol) = 120.7 g.
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Which statement best explains how cellular respiration helps maintain homeostasis in animals?
A.)It maintains body temperature by absorbing energy.
B.)It breaks glucose into energy required by the organism.
C.)It speeds up metabolism by making oxygen.
D.0It produces energy from hormones present in the organism.
Answer:
I am pretty sure it is D.
Cellular Respiration needs to assist Homeostasis in animals to make it easier for the animal to successfully complete the animals Physiological process. So that would make it D. It Produces energy from hormones present in the organism.
Cellular respiration helps maintain homeostasis in animals by producing energy from hormones present in the organism.
What is homeostasis?Homeostasis is a self-regulating process by which biological systems maintain stability while adjusting to changing external conditions.
Cellular Respiration to Produce Heat when the body gets too cold, it maintains temperature homeostasis by producing heat to warm itself.
The body can increase its internal temperature by making heat in skeletal muscle cells and brown fat cells.
Hence, cellular respiration helps maintain homeostasis in animals by producing energy from hormones present in the organism.
Hence, option D is correct.
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