Which expression represents the percent by mass of nitrogen in NH 4 NO 3 ?
a. 28 g N / 80 g NH 4 NO 3 × 100%

b. 14 g N / 80 g NH 4 NO 3 × 100%

c. 80 g NH 4 NO 3 / 28 g N × 100%

d. 80 g NH 4 NO 3 / 14 g N × 100%

 MgCl₂  +Na₂O  →MgO + 2NaCl

the type of reaction above  is double replacement reaction

explanation

Double  replacement  reaction   is type of chemical reaction in which  two compound   react  where  positive  ion (cation)  and negative ion (anion) switch  places forming two new  compounds.

in reaction  above the  new  compounds  formed is MgO  and NaCl as Mg²⁺  and O²⁻ switch their place to form MgO  ,  while   Na⁺  and Cl⁻   switch their place to form NaCl

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].

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]

Answer: HCOOH OR METHANOIC ACID

Explanation:

The titration graph  displays the running of alkali or base into an acid. The start of the graph displays a rapid or quick rise in pH but this slows down as a buffer solution contains HCOOH  and the unknown base or alkali are produced.

[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

Answer is: 4. it increases the average kinetic energy and there are more collisions per minute.

The average kinetic energy of molecules depends on the temperature.

As temperature increases, molecules gain more energy from surrounding and move faster and have more collisions.

Kinetic energy (standard unit is the joule J) depends on speed of the molecule.  

The collision theory states that when suitable particles of the reactant hit each other, only a certain fraction of the collisions cause any noticeable or significant chemical change. These successful changes are called successful collisions.

Answer: OH-

Explanation:

The awnser is OH- trust me. I learned it in school.

Answer:

1,2,4

Explanation:

As trash, synthetic polymers are not biodegradable.

Landfills can easily fill up with synthetic polymers.

Recycling synthetic polymers is costly.

These are the correct ones not the ones the other dude said.

The main problems with synthetic polymers are that they aren't biodegradable, contributing to landfill issues, and recycling them can be quite expensive.

The primary limitations of using synthetic polymers, such as plastics, are that they are not biodegradable, which can lead to accumulation in landfills, and recycling them can be costly. Synthetic polymers, while versatile in application, present serious issues when disposed of. Synthetic polymers do not easily decompose and can persist in the environment for many decades, greatly contributing to landfill overflow. Additionally, the process to recycle polymers is intricate, involving sorting, cleaning and melting materials to be reused. This tends to be expensive and often not economically viable at larger scales.

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The correct answer is the experimental group.  

A group in an experiment, which receives the variable being tested is known as an experimental group. One variable is being examined at a time. The experimental group is compared with a control group that does not get the test variable. In this manner, experimental groups are used to determine the answers in an experiment.  

The experimental group is the group in an experiment that is exposed to the variable being tested. This group undergoes the experimental manipulation, while the control group does not. Any differences observed between the two could be attributed to the experimental manipulation.

In a typical experimental design, the group that is exposed to the variable being tested is known as the experimental group. This group undergoes the experimental manipulation, whereas the counterpart, the control group, does not. Both of these groups are sent through all phases of the experiment. However, the experimental group experiences a different level of the independent variable due to the experimental manipulation.

For example, if a researcher were testing the effect of a new tutoring approach on student performance, the experimental group would receive this new method of tutoring, while the control group would continue with the traditional method. After a set period, the researcher would compare the performances, looking for differences that could be attributed to the new tutoring approach, i.e., the experimental manipulation.

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Each column is called a group.

The elements in each group have the same number of electrons in the outer orbital

The columns each one in the periodic table is called groups. The elements in each group contains the same number of electrons in the outer orbital.

for example, every element in the first column has one electron in its outer shell. In the second column,two electrons in outer shell.

low temperature and high pressure so oxygen gas behave least like an ideal gas

Answer:High temperature and low pressure.

Explanation:

The ideal gas equation presupposes that the molecules of a gas are at infinite distances from each other hence they do not interact at all. This condition can only be satisfied at very high temperature and low pressure. At high temperature, the average kinetic energy of gas molecules is maximum hence they can move apart at great distances from each other. At low pressure, the gasses are relatively free from any kind of intermolecular forces. Hence oxygen will behave as an ideal gas at high temperature and low pressure.

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

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.

Answer: The skin lotion is a colloidal mixture of water and various oils.

Explanation:

Mixture: Blend of of two or more components which are chemically unreactive to give any product.

Mixture are defined as  of three types:

Solutions : Mixture in which one component is completely distributed in an other component resulting in clear mixture. They cannot be separated into its components on standing or by filtration.

Suspensions: Mixture in which one component is not completely or uniformly distributed in another component.They separate out into layers when kept undisturbed.

Colloids: Mixture in which one component is uniformly distributed in another component but the mixture formed is not clear. The color of mixture appears turbid or cloudy. They cannot get separated by filtration. They also cannot get separated into its components when left standing.

A skin lotion is a fine mixture of water and oils. it is a cloudy mixture and cannot be separated with help of filtration. Also its components also not separates out on standing. All these properties shown by skin lotion is of colloidal mixture.

What are the options you have?

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

Answer:

True

Explanation:

How much force is applied & how far the force causes the object to move

This is case of favoritism

vertical relationship is the relationship in a hierarchy, like up down relation

harmony: working in accordance with each other

Socializing: making social relationships with each other

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.

An ionic bond forms between two atoms due to significant electronegativity difference. One atom loses electrons to become a cation while the other gains these electrons to become an anion. These oppositely charged ions attract each other to form the bond.

An ionic bond is a type of chemical bond that forms between two atoms with significantly different electronegativity values. This difference causes one atom (usually a metal) to lose electrons, becoming a positively charged cation, while the other atom (usually a non-metal) gains these electrons, becoming a negatively charged anion. The attraction between these two opposite charges is what forms the ionic bond. For example, in sodium chloride (NaCl), sodium (Na) loses one electron to become Na+ and chlorine (Cl) gains this electron to become Cl-, forming an ionic bond.

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An ionic bond is formed by the transfer of electrons between atoms with significant differences in electronegativity, typically a metal and a non-metal.

This results in the formation of positively and negatively charged ions that are attracted to each other by electrostatic forces.

The resulting Na+ and Cl- ions are attracted to each other, forming a stable ionic compound.

Final answer:

To oxidize 3 moles of zinc to zinc sulfide, 3 moles of sulfur are needed based on the 1:1 molar ratio of the balanced chemical equation Zn + S → ZnS.

Explanation:

The question, 'how many moles of sulfur will be needed to oxidize 3 moles of zinc to zinc sulfide?' involves a stoichiometric calculation based on a balanced chemical reaction. The reaction between zinc (Zn) and sulfur (S) to form zinc sulfide (ZnS) is represented by the balanced equation:

Zn + S → ZnS

According to the equation, the molar ratio of zinc to sulfur is 1:1. This means that for every mole of zinc, one mole of sulfur is required. Therefore, to oxidize 3 moles of zinc, 3 moles of sulfur will be needed to produce zinc sulfide (ZnS).

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:

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.

when one mole of barium nitrate dissociates into ions it forms 1 mole of Ba2+ and 2 moles of NO3-. The balanced equation is ,

[tex]Ba(No_{3} )_{2}[/tex]→[tex]1Ba^{2+} +2NO_{3} ^{-1}[/tex]

Answer: The chemical equation is given below.

Explanation:

We are given a equation that represents ionization of barium nitrate salt.

Ionization reaction is defined as the reaction in which a salt breaks into its respective ions. The chemical equation for the ionization of barium nitrate is given as:

[tex]Ba(NO_3)_2\rightarrow Ba^{+2}+2NO_3^-[/tex]

By Stoichiometry of the reaction:

1 mole of barium nitrate ionizes to produce 1 mole of barium ions and 2 moles of nitrate ions.

Hence, the chemical equation is given above.

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.

Learn more about scientific methods, here:

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