Directions: Record the number of each atom in each molecule, then record the total number of atoms in the molecule.

Answer:

D

Explanation:

i might be wrong but im sorry if i am

Answer:

D

Explanation:

The roadrunner eats the scorpion. Thus, it's the predator and the scorpion is the prey

Answer:

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

Explanation:

Answer:

The galaxies outside of our own are moving away from us, and the ones that are farthest away are moving the fastest. This means that no matter what galaxy you happen to be in, all the other galaxies are moving away from you.

However, the galaxies are not moving through space, they are moving in space, because space is also moving. In other words, the universe has no center; everything is moving away from everything else. If you imagine a grid of space with a galaxy every million light years or so, after enough time passes this grid will stretch out so that the galaxies are spread to every two million light years, and so on, possibly into infinity. The universe encompasses everything in existence, from the smallest atom to the largest galaxy; since forming some 13.7 billion years ago in the Big Bang, it has been expanding and may be infinite in its scope. The part of the universe of which we have knowledge is called the observable universe, the region around Earth from which light has had time to reach us.

One famous analogy to explain the expanding universe is imagining the universe like a loaf of raisin bread dough. As the bread rises and expands, the raisins move farther away from each other, but they are still stuck in the dough. In the case of the universe, there may be raisins out there that we can’t see any more because they have moved away so fast that their light has never reached Earth. Fortunately, gravity is in control of things at the local level and keeps our raisins together.The American astronomer Edwin Hubble made the observations in 1925 and was the first to prove that the universe is expanding. He proved that there is a direct relationship between the speeds of distant galaxies and their distances from Earth. This is now known as Hubble’s Law. The Hubble Space Telescope was named after him, and the single number that describes the rate of the cosmic expansion, relating the apparent recession velocities of external galaxies to their distance, is called the Hubble Constant. It might be easier to explain about the beginning of the universe and the Big Bang Theory, than to talk about how it will end. It is possible that the universe will last forever, or it may be crushed out of existence in a reverse of the Big Bang scenario, but that would be so far in the future that it might as well be infinite. Until recently, cosmologists (the scientists who study the universe) assumed that the rate of the universe’s expansion was slowing because of the effects of gravity. However, current research indicates that the universe may expand to eternity. But research continues and new studies of supernovae in remote galaxies and a force called dark energy may modify the possible fates of the universe.

Explanation:

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The big bang theory states that the universe started from a single dense point. This single point stretched and inflated gradually because of the expansion. The light from the galaxy shows an increase in the wavelength due to this expansion.

By looking at ultraviolet light, astronomers can tell which stars are forming in different galaxies and where they’re forming inside those galaxies. The ultraviolet and visible light coming from the most distant galaxies is converted into infrared light on its way through the expanding universe.

As the universe is expanding the galaxies are moving away from us. There is a shift in the wavelength of the light coming from these galaxies. This shift in the wavelength is referred to as redshift. This is because an expansion of the universe causes an increase in the distance between the two crests of the wave which results in the wavelength increase.

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Answer:

The IUPAC name of given compound is 3−5−ethyl−5−−3−methylheptane. Explanation: The parental chain is of 7 carbons with single bonds hence it is heptane. Two substituents ethyl and methyl group are attached from an equal distance. Hence according to the alphabetical order preference, counting starts from carbon which is close to an ethyl group.

Answer:

An atom that has a negative or positive charge it is called an ion.

Answer:

It''s called a Cation

Explanation:

Answer:

It’s caused by a disturbance.

It carries energy.

Explanation:

A wave is a disturbance that transmits energy from one point to another. It does no necessarily carry the particles or matter of the medium.

Waves usually carries energy. It is this energy they use in creating disturbances.

Not all waves carries matter; a good example is electromagnetic waves. Also, electromagnetic waves do not require a medium for propagation.

Answer:

homogeneous solutions

Answer:

 When carbon dioxide is passed through lime water for a short time,it turns lime water milky due to formation of a white precipitate of calcium carbonate.

Explanation:

Carbon dioxide dissolves in water and slowly reacts with water to produce carbonic acid. The cloudy white solution observed when CO2 is bubbled into limewater results from a reaction between Ca(OH)2 and either CO2 or H2CO3 to form an insoluble calcium carbonate precipitate.

Considering the definiton of atomic number and atomic mass, the number of neutrons of the potassium is 21.

All atoms are composed of a central nucleus in which there are particles with a positive electric charge, the protons, and a neutral charge, the neutrons, around which other particles with a negative electric charge, which are electrons, move.

Atoms of different elements have different amounts of protons. The atomic number (which is identified by the letter Z) indicates the amount of protons that is present in the nucleus of an atom. This number is then responsible for defining the electronic configuration of the atom and the chemical properties of the element.

On the other side, the atomic mass (A) is defined as the sum of number of protons and number of neutrons:

Atomic mass = Number of protons  + Number of neutrons

In this case, the potassium (K) elements has atomic number 19. That means, the number of of protons is equal to 19. And the atomic mass is 40. So, the number of neutrons is calculated as:

40= 19  + Number of neutrons

Solving:

Number of neutrons= 40 - 19

Number of neutrons= 21

Hence, the number of neutrons of the potassium is 21.

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According to the electronic configuration, the most reactive metal in Period 4 of the periodic table is potassium.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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1. Q = 112.8 kJ

2. Q = 5.01 kJ

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

1. m=50 g=0.05 kg

Lv for water = 2256 kJ/kg

[tex]\tt Q=m.L_v\\\\Q=0.05\times 2256\\\\Q=\boxed{\bold{112.8~kJ}}[/tex]

2. m=15 g=0.015 kg

Lf for water = 334 kj/kg

[tex]\tt Q=m.L_f\\\\Q=0.015\times 334\\\\Q=\boxed{\bold{5.01~kJ}}[/tex]

Answer:

107.8682

Explanation:

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Answer: d        i just took the test

Answer:

it's ammonia. option a

Explanation:

a

Answer: The volume in the balloon at the higher altitude is 260 L

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 760 torr

[tex]P_2[/tex] = final pressure of gas = 511 torr

[tex]V_1[/tex] = initial volume of gas = 233 L

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = [tex]22.0^0C=(22.0+273)K=295K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]-52.0^0C=(-52.0+273)K=221K[/tex]

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

[tex]\frac{760\times 233}{295}=\frac{511\times V_2}{221}[/tex]

[tex]V_2=260L[/tex]

The volume in the balloon at the higher altitude is 260 L

Molarity of the solution = 0.08 M

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

0.5 lb=226,796 g

MW silver nitrat - AgNO₃ = 169,87 g/mol

mol AgNO₃ :

[tex]\tt mol=\dfrac{mass}{MW}=\dfrac{226.796}{169.87}=1.335[/tex]

Molarity :

[tex]\tt M=\dfrac{1.335}{16.75}=0.08[/tex]

Answer:

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Answer:

Neutral particles and positively charged particles

Answer:

True

Explanation:

Friction is defined as the force that opposes motion when an object is sliding over a surface.

As a result of friction, all objects moving over a surface eventually come to rest over time.If we were to successfully create a friction-less surface, an object will remain in motion forever because it will encounter no opposition to its motion.

Hence, the resistance to the motion of objects over  a surface which causes the objects to come to a halt after moving over the surface for some time is called friction.

Answer:

See explanation

Explanation:

A gene mutation can be defined as a permanent change in the DNA sequence that composes a gene, resulting in the observation that the sequence differs from what is obtainable in most individuals that make up the  population. Mutations range from a change in a single DNA building block (change in the sequence of base pairs) to changes in a large segment of a chromosome that includes multiple genes.

Mutation in the color of the wings of the housefly can be passed on to the next generation. If this trait enhances survival of the butterflies, the orange winged butterflies will eventual become extinct and become entirely replaced by the white winged butterflies. This implies that gene pool has been completely modified.

If same kind of mutation of pigmentation of wings is observed in the butterfly then they will result in a white butterfly.

If a gene of the DNA get damaged or changes in such a way that it also results in the changing of genetic message carried by that gene and this process is known by the name of mutation.

In the given question by breeding orange butterfly with a white butterfly in the latest generation of animals, notices a mutation in the genes that calls for pigment in the wings. If the mutation of pigmentation of wings is passed to the next generations with the  same changes in the gene of DNA, then after some generation we would get white butterfly.

Hence, if the same changes observed in the mutation of pigmentation of wings then we get a white butterfly.

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Answer:

C. Fluorine because the model has 9 protons which is represented by the atomic number

Explanation:

We usually identify an element by the number of protons in them. The number of protons is the atomic number of an atom.

Answer: CORRECT answer is A

Cl/S\Cl

Explanation:

A P EX

Answer:

A. VSEPR theory assumes each atom molecule has a geometry to help minimize the repulsion between the electrons within the valence shell of the central atom.

B. Repulsion determines the molecular shape as the electrons are negativley charged. The negativity makes the atoms spread out as much as possible.

C. Lone electron pairs have greater repelling effects as they are closer to the nucleus of the central atom unlike bonding pairs.

Explanation:

Answer: chemical substance

Explanation:

Answer:

C. kilojoules

Explanation:

The bond energy needed to break or create bonds is measured in units called kilojoules.

Bond energy is a form of enthalpy change of a reaction or physical change. The bond energy is the heat content of a covalent bond formed from its constituent elements in the gas phase.

The bond energy is the same in value as the bond dissociation energy and its unit is given in kilojoules.

Answer:

it is indeed a compound

Explanation: