If a light ray strikes a flat mirror at an angle of 27 degrees, what will the reflected ray be?

Answer:

the temperature of a substance while changing often times while rise or fall depending on what is happening. Say you have an ice cube and you put it into a hot soup to cool the soup down the ice cube melts due to the surrounding temperature. In other cases if you want to cool something hot like say hot water you can 1:put it in a cool place such as a refrigerator or freezer or 2:you can leave it out to cool to room temperature.

If something I said didnt make sense plz dont get mad or anything I am only in jr.high in 8th grade and the school year is still fresh so I'm trying to catch up on somethings.

Answer:

When any substance changes its state, the temperature remains constant.

Explanation:

It happens so because the amount of heat supplied during the change of state of any substance is utilized to break the intermolecular forces of attraction or other kinds of forces.

Answer:

2RbNO³ --> 2Rb + N² + 30²

Hope this helps!

The decomposition of RbNO3 can result in different products depending on the reaction conditions, and alkali metal nitrates typically decompose into their metal oxides, nitrogen dioxide, and oxygen. For an accurate balanced equation, specific details regarding the decomposition conditions are necessary.

The decomposition of RbNO3 (rubidium nitrate) would lead to the formation of rubidium nitrite (RbNO2) and oxygen (O2). However, typical nitrates of alkali metals like rubidium do not decompose into nitrites and oxygen as do nitrates of heavier metals; instead, they usually decompose into the nitrate's corresponding metal oxide, nitrogen dioxide, and oxygen. Therefore, since this behavior can be complex and context-dependent, I would need more specific information about the conditions of the decomposition to provide a precise equation.

Let's take a more generic example for illustrative purposes:

In case of RbNO3, if we were to speculate a similar simple decomposition, a balanced chemical equation might be:

2 RbNO3 → 2 RbNO2 + O2.

However, this is just a hypothetical example and should not be taken as the actual decomposition of rubidium nitrate. Understanding the decomposition of such compounds requires knowledge of the specific conditions under which the reaction occurs.

Answer:

C) mixture

Explanation:

Mixture : It is defined as the substance that is made by the combination of two or more different components.

Hence, they can be separated. Answer - C

Pure substance : It is defined as a substance that is made by the combination of only one type of atom or only one type of molecule.

Compound : It is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Element : It is a pure substance which is composed of atoms of similar elements.

Solution: It is the special type of the homogeneous mixture which is composed of more than one substances.

Answer:

See explanation

Explanation:

In yogurt are usually found, (several ) types of gram- positive bacteria. Those bacterias are used to made yogurt, and don't bring negative effects on the human body. These bacterias are Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus bacteria.

When doing a gram-staining on a yogurt sample, this staining will show a positive result if there are gram- positive bacteria present, what is most likely to happen.

In a yogurt sample, normally, no gram-negative bacteria will occur. Although, if gram - negative bacteria will be found. This means the yogurt sample is infected. Those bacteria are (probably) diarrhea causing bacteria such as E. coli and Salmonella.

If gram-negative bacteria are found in the sample, the gram-staining will be negative and show red/pink bacteria.

Answer:

400.15 kelvin

Explanation:

Explanation:

To convert from moles to molecules we simply multiply the number of moles by Avagadro's number, 6.02 × 10²³.

For example if we have 1 mol of a substance we have 6.02 × 10²³ molecules of that substance.

1 mol × 6.02 × 10²³ = 6.02 × 10²³ molecules.

To convert moles to molecules, multiply the number of moles by Avogadro's number, which is 6.022 x 10²³ molecules/mole.

To convert moles to molecules, you need to use Avogadro's number. Avogadro's number is 6.022 x 10²³, which is the number of molecules (or atoms, ions) in one mole of a substance.

Here are the steps for the conversion:

First, identify the number of moles you want to convert.

Next, multiply the number of moles by Avogadro's number (6.022 x 10²³ molecules/mole).

For example, if you have 2 moles of a substance, the number of molecules is calculated as follows:

Molecules = Moles x Avogadro's number

Molecules = 2 moles x 6.022 x 10²³ molecules/mole

Molecules = 1.2044 x 10²⁴ molecules

So, 2 moles of a substance contain 1.2044 x 10²⁴ molecules.

Answer:

If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.

If the gas particles move more quickly, they will collide more frequently with the walls of the container  and pressure will increase.

If the gas particles move more quickly, they will collide with the walls of the container more often and  with more force, and pressure will increase.

Explanation:

The temperature of gases is a measure of the average kinetic energy of the molecules. With increasing temperature comes more kinetic energy for the gaseous particles. If temperature of the system is reduced, the particles will have less kinetic energy and would not be able to move. Temperature is directly proportional to average kinetic energy.

Pressure of gases increases when there is more frequent collision between their particles. The usual case is for gases to move more rapidly as a result of increase in kinetic energy of the system. The particles collides more frequently with one another and the walls of the container if the kinetic energy is raised.

Answer:

If the container is cooled, the gas particles will lose kinetic energy and temperature will decrease.

If the gas particles move more quickly, they will collide more frequently with the walls of the container and pressure will increase.

If the gas particles move more quickly, they will collide with the walls of the container more often and with more force, and pressure will increase.

Explanation:

Answer:

Assuming that the Alleles are uppercase Y for the dominant yellow and lowercase y for the recessive green, the alleles present in the hybrid plant will be Yy, and the color would be yellow as it is a dominant trait.

Answer:

We need to use a Punnett Square to figure this out.

Explanation:

Let's say that for the pea plants, Big Y represents the color yellow while Little y is the color green. If Big Y is dominant (which determines the plant's color) it means the plant is yellow. If Little y is dominant, the plant is green.

A phenotype (the genetic makeup of the offspring) would be green if it's genotype was Yy , or YY. It would be yellow if it was yy.

Both "parent" plant's genotype is "pure" which I'd presume means homozygous (two big letters). We need to use a mono-hybrid cross (4 squares, 1 trait) and cross the parents to see what we get.

MOM PEA PLANT - yy (green, homozygous recessive)

DAD PEA PLANT - YY (yellow, homozygous dominant)

OFFSPRING - 100% Yy (yellow, heterozygous)

There is no way that the parents could make a green plant with their genotypes. So the probability is that 100% of their offspring would be yellow, with the phenotype Yy.

Answer:

Ionization energy is the energy needed to remove an electron from an atom or ion in a gas phase.

HOPE THIS HELPED!!!!!!!!!!!!!! XDDDDDDD

Answer:

Are there multiple choices if they're is please show them for example

A.Apple

B.Banana

C.Carrot

D.Plums

Answer:

C

Explanation:

This is because you are guessing that since Mrs. Sparks always carries around books, she must be a great reader. All the other answers are just facts that you see. For c, you are guessing this.

Answer:

C

Explanation:

Must is the key word. An inference is a guess, you guess Ms. Sparks must be a great reader because she is always carrying around books. You don't know for sure she is a great reader which makes it an inference. Hope this helps!

Answer:

NO2

Explanation:

Molar mass of Nitrogen (N) is 14g/ mole . Molar mass of O is 16g/ mol. So the ratio of atoms of each is  :

Moles of O = mass of O / Molar mass O = 12 / 16 = 0.75 = 3/4 mole of O

Moles of N = mass of N / Molar mass N = 7 / 14 = 0.5 = 1/2 mole of N

So to scale these fractions to a whole number, multiply both by 4.

4 x 3/4 = 3 moles of O; 4 x 1/2 = 2 moles of N. This confirms your first answer: N2O3.

Do the same for the ratio 16:7.

Moles O: 16 / 16 = 1 mole of O

Moles of N: 7 / 14 = 1/2 mole of N

This means for each 1/2 mole of N we have 1 mole of O; or for each mole of N we have 2 moles of O : the ratio is 2.

Multiplying both by 2: N = 1 mole; O = 2 moles. So the molecule is NO2.

Answer:

Explanation:

An element is a _distinct____ substance represented by a __chemical____ symbol. Chemical symbols have _one__ or _two__ letters. The first letter of a chemical symbol is always a _Capital_____ letter and the second letter is always a _small_____ letter.

Elements are distint substances that cannot be split up into simpler substances. Such substances are made up of one kind of atom. Each of them is usually symbolised by a capital letter or a capital letter followed by a small letter derieved from the English or latin or greek name of the element.

An element is a chemical substance that cannot be divided or changed into other chemical substances. Chemical symbols are one- or two-letter designations of elements, with the first letter always capitalized and the second letter (if present) in lowercase. Symbols may be based on English or Latin names.

An element is a chemical substance that can't be divided or changed into other chemi-cal substances by any ordinary chemical means. The smallest unit of an element is the atom.

A chemical symbol is a one- or two-letter designation of an element. Some examples of chemical symbols are O for oxygen, Zn for zinc, and Fe for iron. The first letter of a symbol is always capitalized. If the symbol contains two letters, the second letter is lower case. The majority of elements have symbols that are based on their English names. However, some of the elements that have been known since ancient times have maintained symbols that are based on their Latin names, as shown in Table 4.5.2.

Each element is designated by its chemical symbol, which is a single capital letter or, when the first letter is already “taken” by another element, a combination of two letters. Some elements follow the English term for the element, such as C for carbon and Ca for calcium. Other elements' chemical symbols derive from their Latin names; for example, the symbol for sodium is Na, referring to natrium, the Latin word for sodium.

To find the number of oxygen atoms in a sample of calcium carbonate, calculate the number of moles of calcium carbonate and multiply by the number of oxygen atoms per molecule. The sample contains approximately 29.331 oxygen atoms.

To determine the number of oxygen atoms in a sample of calcium carbonate, we need to know the number of moles of calcium carbonate and the formula of calcium carbonate. The formula for calcium carbonate is CaCO3, which means there is one calcium atom (Ca), one carbon atom (C), and three oxygen atoms (O) in each molecule of calcium carbonate.

First, we need to find the volume of the cube. The volume of a cube is given by V = s3, where s is the length of the sides of the cube. In this case, the length of the sides of the cube is 2.805 in. Therefore, the volume is V = 2.8053 = 22.124 in3.

Next, we need to convert the volume from cubic inches to cubic centimeters, as the density is given in g/cm3. Since 1 in3 = 16.3871 cm3, the volume in cm3 is 22.124 in3 * 16.3871 cm3/in3 = 362.274 cm3.

Finally, we can calculate the mass of the sample of calcium carbonate using the density formula: density = mass/volume. Rearranging the formula, mass = density * volume. Plugging in the values, mass = 2.70 g/cm3 * 362.274 cm3 = 978.780 g.

Now, we know the mass of the sample, which is equal to the molar mass of calcium carbonate multiplied by the number of moles. The molar mass of calcium carbonate (CaCO3) is calculated by adding the atomic masses of calcium, carbon, and three oxygen atoms: 40.08 g/mol + 12.01 g/mol + (3 * 16.00 g/mol) = 100.09 g/mol.

Using the equation: mass = molar mass * moles, we can solve for the moles of calcium carbonate in the sample. Rearranging the equation, moles = mass / molar mass. Plugging in the values, moles = 978.780 g / 100.09 g/mol = 9.777 mol.

Since there are three oxygen atoms in each molecule of calcium carbonate, the total number of oxygen atoms in the sample is calculated by multiplying the number of moles of calcium carbonate by the number of oxygen atoms per molecule: 9.777 mol * 3 = 29.331 oxygen atoms.

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Answer:

Explanation:

There are three undefined terms in geometry:

They are referred as undefined terms because they are not defined in a formal way, i.e. using mathematically defined words. At the end these terms are abstractions (ideas).

The point has no dimensions, it can be represented by the tip of a sharp pencil.

The line is referred as an infinite set of joined points that extend indefinitely in one direction (from right to left, from north to south), so it has one dimension. The intersection of of two perpendicular walls is an example of what a line is.

Finally, the term to which the question is referred is the plane: an infinite set of joined points that extends in two dimensions. An example of plane is the surface of quite water. The plane does not have depth, only extension; that is why it has only two dimensions.

So, you should remember: points do not have dimensions, lines have one dimension, and planes have two dimensions.

Answer:

The answer to your question is below:

Explanation :

The combined gas law as it name says it combines three gas laws: Boyle's law, Charles' law and  Gay Lussac Law. It states that at initial conditions of pressure, volume and temperature, it there is a change in one of this variables

the equilibrium will be equivalent to a second equilibria of pressure, volume and temperature.

                        [tex]\frac{P1V1}{T1}  =  \frac{P2V2}{T2} \\[/tex]

"1" indicates initial conditions

"2" indicates final conditions

The combined gas law is represented by the equation P1V1/T1 = P2V2/T2 and is used to model the behavior of gases when the number of moles and the ideal gas constant are constant.

The equation that represents the combined gas law is:

P1V1/T1 = P2V2/T2

This law combines Boyle's law, Charles's law, and Gay-Lussac's law, and it is used when the number of moles (n) of a gas and the ideal gas constant (R) are held constant. The combined gas law allows us to predict how a gas will behave under different sets of conditions in terms of pressure (P), volume (V), and temperature (T), assuming the amount of gas in moles does not change.

Examples of Gas Laws:

Boyle's Law: P1V1 = P2V2 (at constant n and T)

Charles's Law: V1/T1 = V2/T2 (at constant n and P)

Gay-Lussac's Law: P1/T1 = P2/T2 (at constant n and V)

Each can be derived from the combined gas law depending on which variables are held constant.

Answer:

The momentum is 999 Kg.m/s.

Explanation:

Momentum:

It is the product of mass and velocity of moving object.

Formula:

P = m . v

P = momentum

m = mass

v = velocity

Unit:

Its unit is Kg. m/ s.

Given data:

mass = 90 Kg

velocity = 11.1 m/s

Solution:

p = m.v

p = 90 Kg × 11.1 m/s

p = 999 Kg.m/s

Answer:

0.004012km

Explanation:

Problem:

Conversion of millimeters(mm) to Kilometers:

value given = 4012mm

Here, we are converting from a submultiple unit to a multiple unit.

Millimeter depicts 10⁻³m and kilometer stands for 10³m

Now, we must find how many exponents will take us from 10⁻³ to  10³

careful examination shows that if we multiply a power of 10⁶ to 10⁻³ it will give a 10³:

   i.e 10⁻³ x 10⁶ = 10⁻³⁺⁶ = 10³

Therefore,

       10⁶mm = 1km

      4,012mm = [tex]\frac{4012}{1000000}[/tex] = 0.004012km

To convert millimeters to kilometers, we have to remember that 1 kilometer equals 1000 meters and 1 meter equals 1000 millimeters, hence 1 kilometer equals 1,000,000 millimeters. So, 4012 millimeters is equal to approximately 0.004012 kilometers.

The subject of this question pertains to unit conversion within the metric system. Given a distance measured in millimeters (mm), we want to convert this to kilometers (km). To convert, we will utilize the fact that 1 kilometer equals 1000 meters and 1 meter equals 1000 millimeters. Therefore, 1 kilometer equals 1,000,000 millimeters.

To convert 4012 millimeters into kilometers, we divide 4012 by 1,000,000, which gives us approximately 0.004012 kilometers. So, the distance between the two milkweed plants on the caterpillar's map, when converted to kilometers, is 0.004012 kilometers.

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Answer:

C in the middle with 2x F and 2x Cl bound to it. Both F and Cl have 7 valence electrons. ( See photo)

Explanation:

Of the three ( C, F and Cl) carbon has the lowest electro negativity so we expect it to be in the middle.

C: 4e-  

F: 7e-  x 2 = 14e-

Cl: 7e-  x2 = 14e-

4+14+14 = 32 electrons : octet rule

CF2CL2 = Dichloro Difluoro Methane,

To draw the Lewis dot structure for CF2Cl2, begin by calculating the total number of valence electrons, arrange the atoms with Carbon in the center, then create bonds and distribute the remaining electrons to observe the octet rule. The final Lewis structure would satisfy the octet rule for all atoms in the molecule.

To draw the Lewis dot structure for CF2Cl2, we need to follow certain steps. Firstly, find the total number of valence electrons. Carbon (C) has 4, Fluorine (F) has 7 each, totaling 14 for the pair, and Chlorine (Cl) also has 7 each, totaling 14 as well for both atoms in the compound. This gives us a total of 32 valence electrons. Next, arrange the atoms with Carbon in the middle and fluorine, and Chlorine atoms surrounding it.

Now, draw a single bond between the Carbon and Fluorine atoms, and also the Carbon and Chlorine atoms to signify shared electrons and subtract the shared electrons from the total of 32. Each bond contains two electrons. The remaining 24 electrons should be distributed among the Fluorine and Chlorine atoms to satisfy the octet rule (each atom should have 8 electrons in its outer shell). This means adding three lone pairs to each Fluorine atom and each Chlorine atom.

The final notation would look like CF2Cl2 with each non-carbon atom surrounded by eight electrons, fulfilling the octet rule. The atom in the center, Carbon, also shares eight electrons, therefore, the octet rule is satisfied for every atom in the molecule.

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A metalloid is an element that has properties that are intermediate between those of metals and nonmetals. Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, are considered to be metalloids.

Final answer:

Metalloids are elements with intermediate properties between metals and nonmetals, found along the staircase line of the periodic table and exclude aluminum and polonium. They are semiconductors with applications in electronics, as their conductivity increases with temperature. Silicon is a well-known metalloid, which is used for its semiconductor properties.

Explanation:

Metalloids are elements that exhibit properties intermediate between those of metals and nonmetals. These elements, sometimes referred to as semimetals, are located on the periodic table along a staircase line starting from element 5B (boron) and ending at 85At (astatine), excluding aluminum and polonium which are classified as metals. Metalloids such as boron, silicon, germanium, arsenic, antimony, and tellurium display a combination of metallic and nonmetallic characteristics, for instance, they tend to look metallic, but they do not conduct electricity as well as metals and thus are considered semiconductors.

These elements find numerous applications in the field of electronics due to their unique ability to control electrical conductivity. Their conductivity increases with temperature, a property that distinguishes them from metals and makes them valuable in electronic devices. The intermediate electronegativity and chemical behaviors are due to their electron structure, making them versatile in reactions; they form covalent crystals unlike metals but do not form monatomic anions like nonmetals. Silicon, a prominent metalloid, is particularly noted for its luster and brittleness.

Answer:

0.449  10^(-8)  meters

[tex]0.449 * 10^{-8}[/tex] meters

Explanation:

Use the deBroglie equation for the wavelength (lambda):

[tex]lambda = \frac{h}{m*v}[/tex]

where h stands for the Plank constant: [tex]6.6261 * 10^{-34} J[/tex]

m stands for the mass of the electron: [tex]9.109 * 10^{-31} kg[/tex]

and v is the given velocity: [tex]v = 1.62 *  10^5 \frac{m}{s}[/tex]

Evaluating lambda for these values:

[tex]lambda = \frac{h}{m*v}= \frac{6.6261 * 10^{-34} }{9.109 * 10^{-31} * 1.62 * 10^{5}} = 0.449* 10^{-8} m[/tex]

Answer : The wavelength of an electron is, [tex]4.39\times 10^{-9}m[/tex]

Explanation :

According to de-Broglie, the expression for wavelength is,

[tex]\lambda=\frac{h}{p}[/tex]

and,

[tex]p=mv[/tex]

where,  

p = momentum, m = mass, v = velocity

So, the formula will be:

[tex]\lambda=\frac{h}{mv}[/tex]

where,

h = Planck's constant = [tex]6.626\times 10^{-34}Js[/tex]

[tex]\lambda[/tex] = wavelength  = ?

m = mass  of electron = [tex]9.31\times 10^{-31}kg[/tex]

v = velocity = [tex]1.62\times 10^5m/s[/tex]

Now we have to calculate the wavelength.

Now put all the given values in the above formula, we get:

[tex]\lambda=\frac{h}{mv}[/tex]

[tex]\lambda=\frac{6.626\times 10^{-34}Js}{(9.31\times 10^{-31}kg)\times (1.62\times 10^5m/s)}[/tex]

[tex]\lambda=4.39\times 10^{-9}m[/tex]

Therefore, the wavelength of an electron is, [tex]4.39\times 10^{-9}m[/tex]

Answer:

Yes, you can determine which one.

Explanation:

Hi, there are many factors that can be used to compare the atomic radius of to elements but the most important is the amount of electrons each atom has.

The atomic number represents the amount of protons and electrons (if the element isn't ionized) that the atom has.

The more electrons the atom has, the more energy levels it completes. And each of this levels has a longer radius than the one before it.

So, higher levels completed represent longer atomic radius.

In conclusion, a element with an atomic number 20 greater than the other has 20 more electrons, completed more energy levels and its radius will be longer

Answer:

[tex]1.21\times 10^4[/tex] cal would be needed to heat 5.0 lbs of copper from 22 degrees C to 80.0 degrees C.

Explanation:

[tex]Q=m \times c \times \Delta T[/tex]

where

[tex]\Delta T[/tex] = Final T - Initial T

Q is the heat energy in calories

c is the specific heat capacity (for copper 0.092 cal/(g℃))  

m is the mass of water

plugging in the values

[tex]$Q=5.01 b s \times 0.092 \frac{c a l}{g^{\circ} \mathrm{c}} \times\left(80.0^{\circ} \mathrm{C}-22^{\circ} \mathrm{C}\right)$[/tex]

Please Note:

1 lb = 453.592grams  

So,  

5 lbs = 5 × 453.592g  = 2268 g

[tex]$\begin{aligned} Q &=2268 g \times 0.092 \frac{c a l}{g^{\circ} \mathrm{C}} \times 58^{\circ} \mathrm{C} \\\\ Q &=12102 \mathrm{cal} \end{aligned}$[/tex]

[tex]=1.21\times10^4[/tex] cal (Answer)

Answer:    Greater than 21 °C because heat energy is formed from the energy used in shaking

Explanation:    I got this test and i got it right

The temperature of the water will be greater than 21 °C because the shaking converts the kinetic energy into thermal energy. The kinetic energy of the skier at a height of 60 meters is 20,000 units.

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. In the experiment described, the shaking of the flask converted the kinetic energy of the students' motions into thermal energy, thereby increasing the temperature of the water. Therefore, the temperature of the water after shaking will be greater than 21 °C because heat energy is formed from the energy used in shaking.

The kinetic energy of the skier can be calculated by subtracting the potential energy at the height of 60 meters from the potential energy at the height of 100 meters. Since the potential energy at the height of 100 meters is 50,000 units and the potential energy at the height of 60 meters is 30,000 units, the difference is 20,000 units. Therefore, the kinetic energy of the skier at a height of 60 meters is 20,000 units.

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Answer:

10

Explanation:

the capacity for each shell for the first 20 elements can be given by

2.8.8.2

2 electrons in the first shell

8 in the 2nd and in the 3rd

and 2 in the 4th

so if both the first and 2nd shells are full,

2+8=10 electrons

Answer:

10 is the total number of electrons present in that atom.

Explanation:

The formula for total number of electron in nth shell is given by :[tex]2n^2[/tex]

First shell = 1

Number of electron in first shell,n = 1:

= [tex]2(1)^2= 2[/tex]

Number of electron in first shell,n = 2:

= [tex]2(2)^2= 8[/tex]

Total number of electrons in the atom with full first shell and second shell:

2 + 8 = 10

Answer:

Explanation:

An independent variable is a variable in which does not rely on how other variables. It is usually cause in an experiment. From Sara Lilia experiment, we can identify the different music genres as her independent variable.

The dependent variable here is her ability to concentrate in her study. Here, we should know that the dependent variable is often the result of the effects of the independent variable.

There is no control in the experiment. In the controlled set up, we would have put all other know factors that would make concentrations easier into consideration. It could be the environment, the arrangement of the room and a particular time of the day. None of such was stated in the experiment.

The constant variable is the variable that was held fixed throughout the experimental procedure. Here the time of study was fixed at 5minutes. What would happen to concentration if this time was shorter or much more?

Answer:

electrons

Explanation:

they are composed of negatively charged particles also known as electrons

Cathode rays are made up of electrons, which are particles with a negative charge and mass. This was determined through historical experiments that demonstrated cathode rays' deflection by magnetic and electric fields and measured their charge-to-mass ratio.

Cathode rays are composed of particles known as electrons. Historical experiments conducted by scientists like J. J. Thomson and William Crookes revealed the nature of these rays. Using a cathode ray tube, Crookes observed that a paddle wheel placed between the electrodes moved from the cathode towards the anode upon the commencement of the tube, suggesting that the rays had mass. Similarly, Thomson's experiments, which involved deflecting the cathode ray with magnetic and electric fields, established that these rays are indeed made up of charged particles with a negative charge and have a specific mass-to-charge ratio.

The discovery that cathode rays are deflected away from a negatively charged electrical field and toward a positively charged field, along with their response to magnetic fields, was crucial in determining their particle nature. Thomson's calculation of the electron's charge-to-mass ratio further cemented the understanding of cathode rays, leading to the realization that electrons are fundamental components of all atoms, not just specific types of gases or metals used in the experiments.

Answer:

Hot air rises

Explanation:

Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.

Answer: Option (c) is the correct answer.

Explanation:

A compound is defined as the substance in which different elements are chemically combined together in a fixed ratio by mass.

For example, [tex]MgSO_{4}[/tex] is a compound and elements are present in 1:4 ratio.

A compound can be divided into its constituent or simpler substances.

Hence, a chemical formula shows the elements involved in it along with their identity and relative proportion.

But a chemical formula does not tell how atoms are joined together as it can be done by structural formula and not by chemical formula.

Thus, we can conclude that the chemical formula of a compound does not indicate how elements are joined in the compound.

Answer:

Explanation: This is Quite matching Answer. The formula for pH is pH = -log[H+]. This means pH is the negative base 10 logarithm ("log" on a calculator) of the hydrogen ion concentration of a solution. To calculate it, take the log of the hydrogen ion concentration and reverse the sign to get the answer.

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The limiting reactant in the reaction is NH3. The maximum mass of HCN that can be produced is approximately 180.63 g.

To find the limiting reactant, you firstly convert the mass of each reactant to moles. For CH4, the molecular weight is approximately 16.04 g/mol, so 123 g CH4 is 123/16.04 = about 7.67 moles. For NH3, the molecular weight is approximately 17.03 g/mol, so 114 g NH3 is 114/17.03 = about 6.69 moles. For O2, the molecular weight is approximately 32 g/mol, so 423 g O2 is 423/32 = about 13.22 moles.

The balanced equation shows that the reaction consumes CH4, NH3 and O2 in a 2:2:3 ratio. So for the given amount of reactants, the number of mole ratios is 7.67/2 = 3.84 for CH4, 6.69/2 = 3.35 for NH3 and 13.22/3 = 4.41 for O2. The smallest value is NH3’s which is 3.35, so NH3 is the limiting reactant.

The balanced equation shows that 2 moles of NH3 will produce 2 moles of HCN. Therefore, 6.69 moles of NH3 will produce 6.69 moles of HCN. As the molar mass of HCN is 27 g/mol, the maximum mass is 6.69 moles * 27 g/mol = approximately 181.63 g of HCN.

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