Chlorophyll is essential to photosynthesis because it traps the _______________ needed.
A. oxygen
B. water
C. carbon dioxide
D. sunlight

Hello!! My answer would be that they should add the solar panels that faces the south. Since the sun rises in the east and sets in the west, the south portion would get both sunlight from the east and west sides. I hope this helps!!

In the northern hemisphere in order to get maximum solar gain, the solar house should face south side as the sun's heat energy falls maximum there.

The following compounds are soluble in water and will dissociate when dissolved in water.

A) barium hydroxide

B) ethanol  

C) glucose

D) silver nitrate  

E) dichloromethane

F) postassium chloride

The other compounds ethanol and glucose  are also soluble in water but do not dissociate when dissolved in water.

A lot of compound do dissociate when dissolved in water. The following compounds are soluble in water and will dissociate when dissolved in water. They are;

A lot of compounds do dissociate when dissolved in water. The  Substances that dissolve in water is said to produce ions called electrolytes.

Electrolytes can chemically react with water to produce ions  or they may be ionic compounds that dissociate to yield cations and anions, when they have been dissolved.

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CaCo3 was the correct answer.

The most likely composition of the precipitate is CaCo3

A homogenous combination of two or greater materials in relative amounts that can be varied continuously up to what is referred to as the limit of solubility. The term solution is commonly applied to the liquid country of matter, but solutions of gases and solids are feasible.

Limewater is the commonplace call for a saturated aqueous answer of calcium hydroxide. Calcium hydroxide, Ca(OH)2, is moderately soluble at room temperature in water (1.5 g/L at 25 °C).

Calcium hydroxide, additionally known as slaked lime, Ca(OH)2, is obtained by the movement of water on calcium oxide. when combined with water, a small proportion of it dissolves, forming an answer known as limewater, the relaxation final as a suspension referred to as milk of lime.

A saturated solution of Ca(OH)2 can be prepared with the aid of the response of calcium metal with water. Calcium is oxidized through water, yielding calcium hydroxide and hydrogen fuel.

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"There are three rules on determining how many significant figures are in a number: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant."

Final answer:

In chemistry, significant figures are used to indicate the precision or certainty of a measurement. There are five rules for determining the number of significant figures in a measurement.

Explanation:

In chemistry, significant figures are used to indicate the precision or certainty of a measurement. There are five rules for determining the number of significant figures in a measurement:

All non-zero digits are significant.

Zeroes between non-zero digits are significant.

Leading zeroes (zeros to the left of the first non-zero digit) are not significant.

Trailing zeroes (zeros to the right of the last non-zero digit), if there is a decimal point, are significant.

Trailing zeroes (zeros to the right of the last non-zero digit), if there is no decimal point, may or may not be significant.

Examples:

a. 5.87 has three significant figures (rule 1)

b. 0.031 has two significant figures (rule 1 and rule 4)

That would be the emission of an electron.

Beta decay can be described by the emission of an electron.

Beta decay happens when an atom has too many protons or too many neutrons in its core. This causes the atom to be unstable and release an electron in the process.

Answer:

2-

Step-by-step explanation:

An O atom is neutral because it has the same  number of protons as electrons.

O is in Group 16, so it adds two electrons to get a complete octet.

Since it has two extra electrons, the charge on an oxygen ion is 2-.

The best example of a country that is dependent on other countries is a country that has very little or less fertile soil to make its resources.

Vietnam, a peripheral nation, greatly depends on core nations for industrialization, jobs, and aid. The 19th-century U.S. also showed dependency by borrowing heavily from abroad for economic development. This is a reflection of how nations are interconnected in the global marketplace.

A prime example of a country that heavily depends on other countries is Vietnam. It is considered a peripheral nation, which means it has little industrialization and relies on more industrialized nations, called core nations, for jobs and aid. Their industries are often owned or leased by companies from these core nations, which causes a shift in power and resource distribution.

Another example can be seen in the United States during the 19th century. The country borrowed heavily from abroad, showing its dependency on external aid for its economic prosperity. This is basically a result of the interdependence of economies in our global marketplace.

Everyday items like food, clothes, and electronic gadgets are often products of international trade, giving rise to the intertwined economic systems of nations. For instance, the car you drive may be from Japan, while the fuel comes from the Middle East. Countries, therefore, rely heavily on one another to meet their needs and continue business operations.

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The thermal energy heats up the energy in the ice cube causing it to melt and cool off the drink slightly.

5,200

dozen = 12

pair = 2

gross = 144

ream =  500

Pair, dozen, gross, ream, 5,200

Final answer:

To find the number of moles in 7x10⁵⁶ formula units of CaCl2, divide the given formula units by Avogadro's number.

Explanation:

To find the number of moles in 7x10⁵⁶ formula units of CaCl2, we need to know the molar mass of CaCl2. The molar mass of CaCl2 is 110.98 g/mol. To convert formula units to moles, we can use Avogadro's number, which is 6.022 × 10²³ particles/mol. So, we can calculate the number of moles as follows:

7x10⁵⁶ formula units * (1 mol / 6.022 × 10^23 formula units) = 1.16x10³³ moles

Answer: Rate law=[tex]k[A]^1[B]^2[/tex], order with respect to A is 1, order with respect to B is 2 and total order is 3. Rate law constant is [tex]3L^2mol^{-2}s^{-1}[/tex]

Explanation: Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

[tex]Rate=k[A]^x[B]^y[/tex]

k= rate constant

x = order with respect to A

y = order with respect to A

n = x+y = Total order

a) From trial 1: [tex]1.2\times 10^{-2}=k[0.10]^x[0.20]^y[/tex]    (1)

From trial 2: [tex]4.8\times 10^{-2}=k[0.10]^x[0.40]^y[/tex]    (2)

Dividing 2 by 1 :[tex]\frac{4.8\times 10^{-2}}{1.2\times 10^{-2}}=\frac{k[0.10]^x[0.40]^y}{k[0.10]^x[0.20]^y}[/tex]

[tex]4=2^y,2^2=2^y[/tex] therefore y=2.

b) From trial 2: [tex]4.8\times 10^{-2}=k[0.10]^x[0.40]^y[/tex]    (3)

From trial 3: [tex]9.6\times 10^{-2}=k[0.20]^x[0.40]^y[/tex]   (4)

Dividing 4 by 3:[tex]\frac{9.6\times 10^{-2}}{4.8\times 10^{-2}}=\frac{k[0.20]^x[0.40]^y}{k[0.10]^x[0.40]^y}[/tex]

[tex]2=2^x,2=2^1[/tex], x=1

Thus rate law is [tex]Rate=k[A]^1[B]^2[/tex]

Thus order with respect to A is 1 , order with respect to B is 2 and total order is 1+2=3.

c) For calculating k:

Using trial 1:  [tex]1.2\times 10^{-2}=k[0.10]^1[0.20]^2[/tex]

[tex]k=3 L^2mol^{-2}s^{-1}[/tex].

Answer is: D. ΔH is negative for reaction A and ΔH is positive for reaction B.

There are two types of thermochemical reactions:  

1) endothermic reaction (chemical reaction that absorbs more energy than it releases).

For example, ΔH(reaction) = 150 kJ/mol; this is endothermic reaction.

2) exothermic reaction (chemical reaction that releases more energy than it absorbs).

For example, ΔH(reaction) = -225 kJ/mol; this is exothermic reaction.

the change in enthalpy = the total bonding energy for the products of a reaction - the bonding energy of the reactants.

Bacteria, archaea, eukarya This is all I know. Hope it helps.

In 1735 Carlous Linneaus a Botanist said that there needs to be a way to classify organisms and living things. He decided that he'll sort organisms into seven major taxa, or groupings. He called the highest taxa kingdom and the lowest taxa species. This is known as the first idea in the process of Linnaean Taxonomy.

Then in 1990 Carl Wossen a microbiologist and biophysicist added to this idea saying that he Linnaean taxonomy works well, but it could be better. Thta there could be a better way into classifying and grouping kingdoms. He then created 3 domains: Bacteria, Archaea, and Eukarya, aka, regular bacteria, extreme bacteria, and everything else.

This furthermore is the method we use in classifying living things.

The answer is: B, Domain.

∆Grxn = sum of ∆Gf (products) -  sum of ∆Gf(reactants)

The reaction is

4NH3(g)+ 5O2  ---> 4NO(g)+6H2O(g)

∆Grxn = [ 4 X ∆Gf(NO) + 6 X ∆Gf(H2O)] - [ 4∆Gf(NH3) + 5 ∆Gf(O2)]

∆Grxn = [4 X (86.7) + 6 ∆Gf(H2O)] -[ 4 (-16.66) + 5(0)]

∆Grxn = [346.8 + 6∆Gf(H2O)] - [-16.66 + 0]

∆Grxn = -957.9 =  [346.8 + 6∆Gf(H2O)] - [-66.64 + 0]

-957.9 =  [346.8 + 6∆Gf(H2O)] - [-66.64 + 0]

∆Gf(H2O) = -90.74

This is based on information provided by you.

However the answer should be nearly -241.8

Answer:

- 228.6 kJ/mol.

Explanation:

I got bandz

C. gravitational force

C.) Gravitational Force

[tex]V=\frac{nRT}{P} [/tex]

Ideal gas equation:-

[tex]PV=nRT[/tex]

Here, [tex]P[/tex] is the pressure, V is the volume, R is the gas constant, n is the number of moles, T is temperature.

So, from the above equation, the ideal gas law would you use to calculate the volume of a gas is as follows:-

[tex]V=\frac{nRT}{P} [/tex]

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Hello.

The answer is: protons and nutrons

Have a nice day

The answer is speed of light. All kinds of light waves travel at 3.00 m/s.

Visible light, X Rays, infrared radiation, and radio waves are all forms of electromagnetic radiation. They vary in terms of their wavelength and frequency. Despite these differences, they share the same basic characteristic: the ability to travel in wave form.

Visible light, X Rays, infrared radiation, and radio waves are all types of electromagnetic radiation. They may vary in wavelength and energy, but they share the same basic nature: they are all forms of energy that travel in waves and do not need a medium to propagate.

For instance, the key difference between these types of electromagnetic radiation is their wavelengths and frequency: radio waves have long wavelengths and low frequencies, while X-rays have short wavelengths and high frequencies. Visible light exists somewhere in the middle of this spectrum, with wavelengths longer than X-rays but shorter than radio waves.

Infrared radiation, on the other hand, has photons with energies slightly less than red light, has wavelengths on the order of a micron (um), and sits right next to visible light on the radiation spectrum.

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The given statement is True.

This is single replacement reaction.

As reactivity decreases down the group,

Iodine is less reactive than Chlorine.  

And so Iodine cannot replace chlorine from FeCl2.

I2 + FeCl2 ---> no reaction (Iodine is less reactive than chlorine)

Answer:

yes the answer is true

Explanation:

The first answer would be:

Measure the sequence of events on earth over time.

I believe the second answer would be:

The age of earth. ( I say this because geological time is used to describe timing and the relationship of events in earths history)

I’m not sure about number 3 but I hope this was somewhat useful!!

This laws states,

The volume of a given gas which is held at constant pressure is directly proportional to temperature. which means, as volume increases temperature also increases.[tex]V\alpha T\\\frac{V}{T} =C\\\frac{V_{1} }{T_{1} } =\frac{V_{2} }{T_{2} }[/tex]

Volume in litres or mL

Temperature in Kelvin.

Charles's Law states that the volume of a gas is directly proportional to its temperature in Kelvins, provided that the pressure and the amount of gas remain constant.

In the field of Chemistry, Charles's Law is a principle that describes the direct proportionality between the volume and temperature of a gas at constant pressure. This law was articulated by French Scientist Jacques Charles around 1787 and was later published by Joseph Louis Gay-Lussac.

According to Charles's Law, as the temperature of a gas increases, so does its volume, and conversely, as the temperature decreases, the volume decreases. This relationship holds true as long as the amount of gas and the pressure remain constant.

It is crucial to note that temperature measurements must be made on the Kelvin scale when applying Charles's Law, because the Kelvin scale starts at absolute zero, which is the point at which there is no molecular motion. Therefore, the law can be expressed mathematically as V ∝ T, where V represents volume and T represents temperature in Kelvins.

To summarize, Charles's Law is an essential part of gas laws, which contributes significantly to our understanding of how gases behave under varying temperatures while the pressure is kept constant.

Given:

Wavelength used by the satellite (λ) = 7.807 cm

To determine:

The frequency (ν) in MHz

Explanation:

Frequency is related to the wavelength by the following equation:

ν = c/λ

where c = speed of light = 3*10¹⁰ cm/s

ν = 3*10¹⁰ cm.s⁻¹/7.807 cm = 3843 *10⁶ s⁻¹

Now, the SI of frequency is Hertz (Hz) where:

1 Hz = 1 s⁻¹

Therefore, ν = 3843 * 10⁶ Hz

Since 1 Megahertz (MHz) = 10⁶ Hz,

ν = 3843 MHz

Ans: The frequency of light is 3843 MHz

  The balanced equation is as below

 2 N₂O₃ →  2N₂ + 3O₂

Explanation

According  to the law  of mass conservation the  number of atoms  in reactants side must  be equal  the to the number of atoms in products  side.

 Therefore the  balanced reaction  above is balanced  since the number of atoms  in reactants side  are equal to number of atoms in products side.

For  there 4 atoms  of N   in reactants  side and  4 in products side.

The balanced equation is  2 N₂O₃ →  2N₂ + 3O₂

180 Joules; The specific heat for water (amount required to raise 1 gram 1 oC) is ,4.184. So just multiply that with the mass of the substance (in grams)

9x20=180

The scientific method is a sequential process that uses predictions from hypotheses to derive observations and conclusions. It helps scientists to collect empirical evidence to prove the theory.

The scientific method has been defined as an empirical approach to using acquired knowledge to draw observations and conclusions from the hypothesis. It helps scientists to answer questions by performing research and experiment.

It allows the establishment of a hypothesis that can be proved true or false by conducting experiments and making observations based on analysis.

The observation allows the findings to be concluded. The data can be interrupted by scientists to conclude their research study with credibility.

Therefore, scientific methods are useful for scientists.

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C is an inference. The phrase "they must have" shows that someone tied information together to form a conclusion.

300 degrees Kelvin = 300 - 273 = 27 degrees Celsius.

So what you need to do is find out how many degrees Fahrenheit that is.

F = 9/5(27) + 32

F = 48.6 + 32

F = 80.6

You are at 55oF. You need to go from 55 to 80.6 or 25.6 degrees F.

Your closest answer is B. <<<<<< Answer

Answer:

B) increase the room temp by 26°F

Explanation:

From the given information:

Room temperature = 55 °F

Required temperature = 300 K

Conversion from K to °F:

[tex]F = 9/5(K-273) + 32\\\\For T = 300 K\\\\F = 9/5(300-273)+32 = 80.6F[/tex]

The required temperature in °F = 80.6°F

Therefore, the lab temperature must be increased by:

[tex](80.6-55)F = 25.6 F[/tex]

what are the statements that you are able to choose from or do you just have to know?