Which determines the reactivity of an alkali metal?

A) its boiling and melting points

B) the shininess of its surface

C) the number of protons it has

D) its ability to lose electrons

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Answer:

Matter is conserved during all chemical reactions because matter cannot be created or destroyed.

Explanation:

Answer:

The type of plate boundary between the South American Plate and the African Plate is a divergent one.

The two plates move apart from each other.

Explanation:

The boundary between the South American Plate and the African Plate is a divergent boundary. The plates moved, and between them, there is an oceanic basin. The plates move on top of the mantle, and magma goes up the divergent areas creating new surfaces when it solidifies. The new surface is called a ridge.

Answer:

fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, ... Most fans are powered by electric motors

The balanced equation

2Na₃PO₄+3Ca(NO₃)₂⇒6NaNO₃+Ca₃(PO₄)₂

Given

Reaction

_Na3PO4+_Ca(NO3)2-->_NaNO3+_Ca3(PO4)2

Required

Balanced equation

Solution

Give a coefficient

aNa₃PO₄+bCa(NO₃)₂⇒cNaNO₃+Ca₃(PO₄)₂

Ca, left=b, right = 3⇒ b=3

P, left=a, right = 2⇒a=2

Na, left=3a, right=c⇒3a=c⇒3.2=c⇒c=6

The equation becomes :

2Na₃PO₄+3Ca(NO₃)₂⇒6NaNO₃+Ca₃(PO₄)₂

Yes, both of them are considered lewis structures

Lewis structures are ways in which the valence electron of a compound are arranged around its elements using dots. It represents and shows how electrons are arranged around individual atoms.

In lewis structure, electrons are represented as dots and if it is a bonding electron, it can be represented as lines. Since the elements in the compound given are both non-metals, they are covalently bonded. This shows the reason why one of the lewis structures contains lines.

National Association for the Advancement of Colored People  group helped Fred Korematsu defend himself in court,

Fred Toyosaburo Korematsu (January 30, 1919 – March 30, 2005) was an American civil rights activist who opposed Japanese American incarceration during WWII. Shortly after the Imperial Japanese Navy attacked Pearl Harbor, President Franklin D. Roosevelt issued Executive Order 9066, which authorised the removal of Japanese-Americans living on the West Coast from their homes and their mandatory imprisonment in incarceration camps, but Korematsu instead challenged the orders and fled.

The validity of Roosevelt's order was maintained by the United States Supreme Court in Korematsu v. United States. (1944). However, Korematsu's conviction for avoiding imprisonment was overturned in US District Court four decades later, following the emergence of fresh information questioning the necessity of internment.

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Answer:

-It is considered the modern atomic model.

-It describes the probable locations of the electrons

Explanation:

edge 2020

The correct answer is:

The electron cloud model is another name used to describe the modern wave mechanical model of the atom.

It is the atomic model introduced by Erwin Schrodinger in 1927 based on the principles of quantum mechanics. It was an advancement over the Bohr model of the atom.

In this model, the atomic orbital is described as a region in space where there is a high probability of finding an electron. Hence, the electron is not found in specific orbits according to the Bohr model, rather, we describe the probability of finding the electron. This is the contemporary approach to the study of atomic structure.

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The structural formula of butanol is C4H9OH. It consists of a chain of four carbon atoms, with a hydroxyl (-OH) group attached to one of the carbon atoms. Butanol has several structural isomers, which have the same molecular formula but different structural formulas.

A structural isomer is a compound that has the same molecular formula as another compound but has a different arrangement of its atoms. A string of 4 C atoms are bonded above, below, left, and right to H, except the second C, which is bonded below to O, which is bonded below to H is a structural isomer of butanol.

This is called butan-2-ol. The structural formula of butan-2-ol is CH3CH(OH)CH2CH3. In this isomer, the hydroxyl group is attached to the second carbon atom in the chain, whereas in butanol, the hydroxyl group is attached to the first carbon atom in the chain.

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To name Type 2 ionic compounds such as AuCl₃, you need to use the Stock system or Roman numeral system to indicate the oxidation state of the cation. Some steps are; Identify the cation, Determine the charge, Write the name, and combine two names.

Here are the steps to name AuCl₃; Identify the cation and anion. In this case, the cation is Au³⁺ and the anion is Cl⁻.

Determine the charge on the cation by using the anion's charge and balancing the charges to zero. Since Cl⁻ has a charge of -1 and there are three Cl⁻ ions in the compound, the total negative charge is -3. Therefore, the Au³⁺ ion has a charge of +3.

Write the name of the cation first, followed by the name of the anion with an -ide ending. Since the cation is Au³⁺, we use the name "gold(III)" to indicate the oxidation state of +3. The anion is Cl⁻, so we add the -ide ending to get "chloride".

Combine the two names to get the compound's name: "gold(III) chloride".

Therefore, the name of the Type 2 ionic compound AuCl₃ is "gold(III) chloride".

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Answer:

Bromine

Sodium

Explanation:

Bromine has a stronger electronegativity value, thus making it more able to attract electrons.

Sodium only has one valence electron (Cl has seven) so it's easier for sodium to give up it's one electron to obtain a noble gas configuration than it would be for it to find seven more electrons to add to it's shell.

Metals tend to lose electrons while nonmetals tend to gain electrons.

Answer:

192

Explanation:

24-8=16

16x60=960

960/5=192

The rock sample on the left is basalt, a type of igneous rock. Heat and intense pressure changed the basalt into blueschist, a type of metamorphic rock glaucophane schist

Blueschist facies is determined by the particular temprature and pressure condition required to metamorphose basalt to form blueschist and felsic rock and pelitic sediment which are subjected to blueschist facies condition will form different mineral assemblages then metamorphosed and blueschist facies rock are generally formed in subduction zones where oceanic crust is being stuffed into a trench that will become true blueschist once they were pressure cooked and also called glaucophane schist and is a metavolcanic rock that with similar composition at high pressure and low temprature

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Answer:

1.

a. Diagram A

b. Diagram A should stay still, but Diagram B should move/roll to the left.

__________________________________

2.

a. Diagram A and Diagram B are different because the object kg are different, one is 10kg and the other is 2kg.

b. Diagram B because its smaller making it lighter to move when Diagram A is 5 times larger, which will make it heavier.

__________________________________

3.

a. Diagram A and Diagram B compare because the object both equal 3kg.

b. Diagram A will have a greater acceleration because 80n > 40n

Answer:

Explanation:

what?

Answer:

hope it helps..

Explanation:

'Motile' (or moving) cilia are found in the lungs, respiratory tract and middle ear. ... These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation.

Answer: to keep airway clear of mucus and dirt allowing us to breathe easy

Explanation:

To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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Answer:

55.56 amu

Explanation:

Let A, B, C and D represent the four isotopes of iron.

The following data were obtained from the question:

Isotope A (Fe-54):

Mass of A = 53.940 amu

Abundance (A%) = 5.82%

Isotope B (Fe-56):

Mass of B = 55.935 amu

Abundance (B%) = 91.66%

Isotope C (Fe-57):

Mass of C = 56.935 amu

Abundance (C%) = 2.19%

Isotope D (Fe-58):

Mass of D = 57.933 amu

Abundance (D%) = 0.33%

Average atomic mass =.?

The average atomic mass of the iron can obtained as follow:

Average atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100] + [(mass of C × C%)/100] + [(mass of D × D%)/100]

Average atomic mass = [(53.940 × 5.82)/100] + [(55.935 × 91.66 )/100] + [(56.935 × 2.19)/100] + [(57.933 × 0.33)/100]

= 2.848 + 51.270 + 1.247 + 0.191

= 55.56 amu

Therefore, the average atomic mass of the iron is 55.56 amu

79942.6 calorie is the number of calories of energy absorbed by the water. The energy of an isolated system holds that energy could be transformed.

In physics, energy is indeed the quantitative quality that is imparted to a body or a physical system and is visible in the form of light and heat.

The energy of an isolated system holds that energy could be transformed in form but cannot be generated or destroyed. The joule is the International System of Units (SI) unit of measurement for energy (J).

Q = 2 kg × 4181 J / kg °C × 40°C

   = 334,480 J

   =79942.6 calorie

Therefore, 79942.6 calorie is the number of calories of energy absorbed by the water.

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Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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A = 2.86 x \(10^{23\) molecules of  \(KMnO_4\)

B = 323.76 grams of Al

C = 1.53 moles of Au

D = 7.71 x \(10^{23\) molecules of \(H_3PO_4\)

E = 4.52 x \(10^{23\) total atoms

According to Avogadro, a single mole of any substance contains 6.022 x \(10^{23\) molecules or atoms of the substance.

Also, the mole of a substance is the ratio of the mass of the substance and the molar mass of the substance. In other words;

mole = mass/molar mass

These theories are what we need to solve the outlined problems.

       Mole of 75 g of \(KMnO_4\):

       mass/molar mass = 75/158

                                     = 0.4747 mol

        Since 1 mole = 6.022 x \(10^{23\) molecules

         0.4747 mole = 0.4747 x 6.022 x \(10^{23\)

                                = 2.86 x \(10^{23\) molecules

       Since 1 mole =  6.022 x \(10^{23\) molecules or atoms

        7.23 x \(10^{24\) atoms = 7.23 x \(10^{24\) / 6.022 x \(10^{23\)

                                     = 12 moles

        Mass of 12 moles Al = 12 x 26.98

                                          =  323.76 grams    

                                    = 1.53 moles

                                   = 1.28 moles

         1.28 moles = 1.28 x 6.022 x \(10^{23\)

                            = 7.71 x \(10^{23\) molecules

                                        = 4.52 x \(10^{23\) atoms

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ANSWER

The heat of reaction of the above reaction is -234 KJ

EXPLANATION

Given information

Recall, that change in enthalpy of the reaction is the summation of the products - summation of the reactants

Mathematically,

The next step is to write the formula for calculating the enthalpy

The next step is to substitute the given data into the above formula

Hence, the heat of reaction of the above reaction is -234 KJ

Answer: come on lets link can do what i do

Explanation:

14 m/ s is the answer. mark me as brainliest

Answer:

\( \large{ \tt{❃ \: EXPLANATION}}: \)

\( \large{ \tt{❁ \: LET'S \: START}} : \)

\( \large{ \boxed{ \bf{❈ \: a = \frac{v - u}{t}}}} \)

\( \large{ \tt{⇾ \: 2 = \frac{v - 4}{5}}} \)

\( \large{ \tt{⇾v - 4 = 5 \times 2}}\)

\( \large{ \tt{⇾v - 4 = 10}}\)

\( \large{ \tt{⇾ \: v = 10 + 4}}\)

\( \large{ \tt{⇾ \: v = \large{ \boxed{ \tt{14 \: m {s}^{ - 1} }}✔}}}\)

\( \large{ \boxed{\tt{⟶OUR \: FINAL \: ANSWER : \boxed{ \underline{ \tt14 \: m {s}^{ - 1} }}}}}\)

✺ Who said grades doesn't matter ? - Your destiny is not going to work every time. Remember that !

\( \large{ \ \tt{ \# \: StayInAndExplore \: ☂}}\)

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Answer:

Explanation:

IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring. All deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities.

Answer:

4.4 mL

Explanation:

Methane gas and chlorine gas react to form hydrogen chloride gas and carbon tetrachloride gas. What volume of hydrogen chloride would be produced by this reaction if 1.1 mL of methane were consumed?

Step 1: Write the balanced equation

CH₄(g) + 4 Cl₂(g) ⇒ 4 HCl(g) + CCl₄(g)

Step 2: Establish the appropriate volume ratio

For gases under the same conditions, the volume ratio is equal to the molar ratio. The molar ratio of CH₄ to HCl is 1:4.

Step 3: Calculate the volume of HCl produced from 1.1 mL of CH₄

1.1 mL CH₄ × 4 mL HCl/1 mL CH₄ = 4.4 mL HCl

The particles that electromagnetic radiation consists of are called photons. These photons exhibit both wave and particle behavior. The greater the momentum of a photon, the shorter its wavelength.

Electromagnetic radiation is the emission of energy in the form of electromagnetic waves or photons from electrically charged particles. Electromagnetic radiation is classified according to its frequency or wavelength. The electromagnetic spectrum is a graphical representation of all the types of electromagnetic radiation, from gamma rays to radio waves.Photons have wave-particle duality, which means they behave like both particles and waves. This implies that they may have a certain amount of momentum as particles and can also exhibit diffraction as waves.The wavelength of a photon is inversely proportional to its momentum, and the greater the momentum of a photon, the shorter its wavelength. Photons, like all other particles, have momentum as a result of their mass and velocity. The energy and frequency of a photon are proportional to each other, with the frequency being inversely proportional to the wavelength.

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Answer:

[OH⁻] = 1.60 × 10⁻⁶ M

Basic

Explanation:

Step 1: Given data

Concentration of H₃O⁺: 6.25 × 10⁻⁹ M

Step 2: Calculate the concentration of OH⁻

We will use the following expression.

Kw = [H₃O⁺] × [OH⁻] = 1.00 × 10⁻¹⁴

[OH⁻] = 1.00 × 10⁻¹⁴ / 6.25 × 10⁻⁹ = 1.60 × 10⁻⁶ M

Step 3: Calculate the pH

We will use the following expresion.

pH = -log [H₃O⁺] = -log (6.25 × 10⁻⁹) = 8.20

Since the pH > 7, the solution is basic.

A stationary front is a boundary between two different air masses that aren't moving relative to each other, but instead are stationary.An air mass is a massive body of air with uniform temperature and moisture characteristics. An air mass takes on the qualities of the area where it forms. As an air mass moves from one place to another, it carries its temperature and moisture content with it.

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Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.