In which concentration of sulfuric acid solution would the reaction occur the fastest?

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.

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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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

Potassium chlorate (KClO₃) decomposed to two smaller compounds KCl and O₂ gas.

So, the right choice is (C) Decomposition reaction

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.

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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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.

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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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

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:

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.

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.

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.

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.

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.

Answer: Question #1) The formation of a precipitate

Question # 2) ? Insufficient information

Question # 3) when you mix baking soda (sodium bicarbonate) with vinegar (acetic acid) the baking soda is the base and the vinegar is the acid, the baking soda takes a proton from the acid and the products of the reaction are H2O and CO2. The initial two products are carbonic acid and sodium acetate and the second part of the reaction is the decomposition reaction with the carbonic acid immediately decomposing into water and carbon dioxide gas. The CO2 rises to the surface creating bubbles.

Question #4) when sodium hydroxide, a strong base reacts with copper sulfate an acidic salt as a blue precipitate of copper hydroxide is produced with ions of sodium sulfate in solution. This represents a double displacement reaction as well as a precipitation reaction.

Explanation:

Answer:

A substance only with one type of atom

Explanation:

took test

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

Answer:

A.

Explanation:

Answer:

A

Explanation:

I just took the usatestprep

Out of the options, the best indicator is a color change since it is the only one that can't really be blamed on a physical change.  you will eventually notice that during qualitative labs and some quantitative labs, usually the thing that you are looking for is either color change or the production of a precipitate to indicate the presence of a chemical reaction  

The correct answer is 2) change of color

Explanation:

A chemical change occurs when a new substance is formed or the original substance changes its identity and composition due to a chemical reaction. This is the opposite of a physical change that modifies only physical properties such as state or shape. Moreover, a chemical reaction can be identified because if often leads to a change in color, odor, the formation of bubbles or temperature change. This implies the only one that suggests a chemical change is a change of color because this occurs if the composition of a substance or substances change.

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

Answer:

A. It measures the [products] / [reactants].

Explanation:

So, the right choice answer:

A. It measures the [products] / [reactants].

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.

Answer:

The precision of a calculated answer is limited by the least precise measurements used in the calculation.

Explanation:

Answer:

D

Explanation:

Its D because she had insulated gloves.

Answer:

D. Brenda picks up a hot beaker with insulated gloves.

Answer:

B. It increases.

Explanation:

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.

The answer is:

Hence, the new pressure will be 2.07 atm.

[tex]P_{2}=2.07atm[/tex]

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!

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.

Are there any choices to your question? If so what are they? Then I can answer. :)

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.

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!

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]

Answer:

1792 J.

Explanation:

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.

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.

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

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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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.

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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