Chemistry College

Isotopes have
Question 1 options:

A)

different numbers of both protons and neutrons in their nuclei.

B)

a different number of neutrons in their nuclei.

C)

a different number of protons in their nuclei.

D)

a different number of electrons.
Question 2 (5 points)
An aqueous solution
Question 2 options:

A)

must contain three or more substances.

B)

is a single-phase heterogeneous mixture.

C)

has water as the solvent.

D)

has water as the solute.
Question 3 (5 points)
Which of the following is a homonuclear diatomic molecule?
Question 3 options:

A)

NH3

B)

CO

C)

2CO2

D)

H2
Question 4 (5 points)
Given a container of a solution of 5% HCl, all samples tested from this same bottle will have the same mass ratio of hydrogen to chlorine. This is an application of
Question 4 options:

A)

the law of conservation of energy.

B)

the law of multiple proportions.

C)

the law of conservation of mass.

D)

the law of constant composition.
Question 5 (5 points)
Elements in the same period
Question 5 options:

A)

have the same principal quantum number.

B)

form bonds with the same type of elements.

C)

have the same number of valence electrons.

D)

have the same number of protons.
Question 6 (5 points)
Which of the following contribute(s) to most of the mass of an atom?
Question 6 options:

A)

Neutrons only

B)

Protons and neutrons

C)

Protons and electrons

D)

Protons only
Question 7 (5 points)
In a certain chemical reaction, the bonds of the products contain more energy than the bonds of the reactants. For the reaction to occur, which of the following best describes what occurred?
Question 7 options:

A)

Energy was released, so the reaction is endothermic.

B)

Energy was released, so the reaction is exothermic.

C)

Energy was added, so the reaction is endothermic.

D)

Energy was added, so the reaction is exothermic
Question 8 (5 points)
A solution
Question 8 options:

A)

is a single-phase homogeneous mixture.

B)

must contain water.

C)

is always a liquid.

D)

can contain more than two phases.
Question 9 (5 points)
Which of the following is true of alloys?
Question 9 options:

A)

They can only be composed of metals.

B)

They must be held together by chemical bonds.

C)

They're liquid solutions.

D)

They must contain a metal.
Question 10 (5 points)
Which of the following best describes an atomic number? An element's identity is defined by its atomic number; this means it represents the number of
Question 10 options:

A)

electrons in the element.

B)

neutrons in its nucleus.

C)

protons plus neutrons in its nucleus.

D)

protons in its nucleus.
Question 11 (5 points)
Electrons in the outermost shell of an atom that are available to bond with the electrons of other atoms are
Question 11 options:

A)

cations.

B)

free electrons.

C)

valence electrons.

D)

anions.
Question 12 (5 points)
Main group elements have valence electrons in which suborbitals?
Question 12 options:

A)

d and f

B)

s and p

C)

p and f

D)

s and d
Question 13 (5 points)
Molecules have
Question 13 options:

A)

only kinetic energy.

B)

only potential energy.

C)

both potential and kinetic energy.

D)

neither kinetic nor potential energy.
Question 14 (5 points)
The majority of elements are
Question 14 options:

A)

metalloids.

B)

nonmetals.

C)

metals.

D)

inert.
Question 15 (5 points)
A student found the mass of an object to be 26.5 g. To find the volume, the student submerged the object in a graduated cylinder of water. Submerging the object in the water in the graduated cylinder increased the water level by 24.1 mL. The density of the object is
Question 15 options:

A)

1.0906 g/mL.

B)

0.909 g/mL.

C)

1.10 g/mL.

D)

1.1 g/mL.
Question 16 (5 points)
Mass and energy are conserved
Question 16 options:

A)

only in chemical changes.

B)

in chemical changes and physical changes.

C)

always in physical changes and sometimes in chemical changes.

D)

only in physical changes.
Question 17 (5 points)
Which of the following can't be broken down any further chemically?
Question 17 options:

A)

Compounds

B)

Elements

C)

Matter

D)

Molecules
Question 18 (5 points)
A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.
Question 18 options:

A)

atom

B)

proton

C)

molecule

D)

electron
Question 19 (5 points)
The distance between consecutive peaks or troughs in a wave is
Question 19 options:

A)

frequency.

B)

displacement.

C)

amplitude.

D)

wavelength.
Question 20 (5 points)
The phase transition of dry ice (frozen carbon dioxide) to gas is an example of
Question 20 options:

A)

condensation.

B)

sublimation.

C)

deposition.

D)

vaporization.

I WILL GIVE BRAINLIEST IF YOU CAN ANSWER THEM

Answers

Answer 1

Answer:

b

Explanation:

dueto isotopes haveno thesame neutral numbee hence b iscorrect

Answer 2

Answer:

b

Explanation:

Related Questions

will mark brainliest, please hurry! :>
When a hydroxyl group is substituted for a hydrogen atom in a hydrocarbon, what type of molecule results?
a.
an alcohol
c.
a carboxylic acid
b.
an amine
d.
a polymer

Answers

Answer:

ans. will be a. an alcohol

Which of the following representations shows the correct placement of trophic levels?
Secondary Consumers
Primary Consumers
Producers

Answers

You have to start listing from the bottom :

3. Secondary Consumers

2. Primary Consumers

1. Producer

Briefly explain why the bulk temperature of the water remains low (at room temperature)

Answers

If the humidity of the room is low, the water that contacts the air directly could evaporate and takes some energy from the bulk thus decreasing its temperature steadily. This allows the water to have a lower temperature.

C2H6O
Percent Composition with work shown

Answers

Answer:

50 percent

Explanation:

percentage

When ignited, a uranium compound burns with a green flame. The wavelength of the light given off by this flame is greater than that of _____.

Answers

Answer:

Ultraviolet light.

Explanation:

Uranium is a natural radioactive chemical element with the chemical symbol "U" and an atomic number of 92. Uranium is used for generating nuclear fuels which are typically used in powering atomic bombs and nuclear reactors in the field of electricity generation.

When ignited, a uranium compound burns with a green flame. The wavelength of the light given off by this flame is greater than that of ultraviolet light which typically ranges from 100nm to 400nm. Where, nm is represents nanometer.

Basically, when ignited, a uranium compound burns with a green flame having a wavelength of 4.30 x 10^-7m to 5 x 10^-7m.

A student conducting a calorimetry investigation determines a negative ∆H. What does the negative value indicate about the reaction?

A. The reaction synthesized a single product.

B. The reaction was exothermic.

C. The reaction absorbed energy.

D. The reaction involved decomposition.

Answers

Answer:

a

Explanation:

correct

When two or more different elements unite chemically, they form a

A) compound
B) mixture
C) metalloid
D) solution

Answers

Answer:

compound ahhhhhhhhhhhhhgh

Which statement best describes how to predict the formula of a stable ionic compound? Use the same number of cations as anions so that the compound is neutral. Use more cations than anions so that the compound is positively charged. Use enough cations and anions so that the total charge is zero. Use fewer cations than anions so that the compound is negatively charged.
IT's C

Answers

Answer:

Option C: Use enough cations and anions so that the total charge is zero

Explanation:

In a stable ionic compound, to get a predict the formula, the positive and negative ions on one side need to cancel out so that the compound becomes neutral.

For example, let's take consider an ionic compound known as Potassium Chloride. It has a formula KCl. Now , breaking it down, the charges will be; K+ and Cl-. This means Potassium (K) has +1 charges and Chloride has -1 charges. Thus, they will cancel out to give a total neutral charge of 0.

Thus, the correct answer is to use enough a ions and cations so that the total charge is zero.

Answer:

C

Explanation:

edge 2020 unit rev


The human eye cannot see anything less than 40 micrometers in size. What is this length in meters?

Answers

Answer:

4e-5 is the length in meters

Have a nice day! :)

Help asap!!!!
What are elements in the tall columns of the periodic table called?
A. Representative elements
B. Valence elements
C. Atomic elements
D. Period elements

Answers

The elements in the tall columns of the periodic table are called representative elements or main group elements. They exhibit similar chemical properties within their respective groups due to their shared number of valence electrons. The terms "valence elements," "atomic elements," and "period elements" are not commonly used or recognized in the context of the periodic table.

The correct answer is option  A.

The elements in the tall columns of the periodic table are called "A. Representative elements," also known as the "main group elements" or "group A elements." These elements are found in groups 1, 2, and 13 to 18 (excluding the transition metals) on the periodic table.

Representative elements are characterized by having similar chemical properties within their respective groups. This similarity arises from the fact that elements within the same group have the same number of valence electrons, which are the electrons in the outermost energy level of an atom. Valence electrons play a crucial role in determining the chemical behavior and reactivity of an element.

The representative elements include the alkali metals (Group 1), alkaline earth metals (Group 2), boron group (Group 13), carbon group (Group 14), nitrogen group (Group 15), oxygen group (Group 16), halogens (Group 17), and noble gases (Group 18). These elements exhibit a wide range of properties, from highly reactive metals to nonmetals and inert gases.

The term "valence elements" mentioned in option B is not commonly used in the context of the periodic table. Valence electrons are indeed significant in determining chemical properties, but they are not specific to the elements in the tall columns. Valence electrons are found in elements across the periodic table.

"Atomic elements" mentioned in option C is a vague term and does not specifically refer to the elements in the tall columns. All elements on the periodic table are atomic in nature, as they are composed of atoms.

"Period elements" mentioned in option D is not a recognized term in the context of the periodic table.

In conclusion, the elements in the tall columns of the periodic table are known as representative elements or main group elements. These elements exhibit similar chemical properties within their respective groups due to their shared number of valence electrons.

Therefore, from the options provided the correct one is A.

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Air masses that form over large bodies of water are moist. What process determines the amount of moisture in an air mass?

Answers

Answer:

I don't know if this is right but try it. The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity. This amount of space in air that can hold water changes depending on the temperature and pressure.

KEEP GETTING THIS WRONG PLZ HELP

Answers

Answer:

1 224.24242 kg/ m to the 3rd power

Please answer 3 and 2

Answers

Answer:

3 is c but im unable to see the 2nd questions picture

Explanation:

A student heats 25 mL of water from 20°C to 96°C in a glass beaker. The
model represents the motion of the water molecules during heating.
Explain why some of the water molecules shown in the model have
longer arrows than other water molecules during heating.

Answers

Answer:

Because the have acquired energy from the heating process, that is why the start moving faster.

Explanation:

Hello.

In this case, since the  initial liquid water molecules have a certain energy content, which makes them move with the relatively medium velocity characteristic in liquid-phase substances, once energy starts being added, it is evidenced that the molecules acquire more energy which is able to make them move faster.

In such a way, since the initial water molecules velocity is marked by a medium range arrows, meaning that the molecules are moving not-so-fast, not-so-slow but the heated  water molecules are marked by longer arrows, meaning that they move faster, we infer that such velocity increase is due to the addition of heat due to the heating process from 20 °C to 96 °C (just before boiling).

Regards!

Molecular motion is the action of motion of the molecules or the particles in a specific direction. The molecules start moving faster due to the energy given by the heat.

What are the factors affecting molecular motion?

The movement of the molecules or the particles in the system is affected by the temperature and the heat given to the system by the external source.

The initial molecules have relative speed and motion in the system and after the addition of the factors the energy of the motion of the particles gets affected.

When the temperature of the water in the beaker is increased then the average kinetic energy of the molecules also increases and hence the motion of the molecules increases.

The medium ranged arrows depict the average speed of the molecule movement in the medium, while the longer arrows suggest the fast-moving molecules of the water.

Therefore, the heat increases energy and in turn the molecular motion.

Learn more about molecular motion here:

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Which among the given combinations below represent a set of isotopes?

1.40 protons and 40 neutrons
II. 41 protons and 39 neutrons
3.42 neutrons and 48 protons
4 40 protons and 42 neutrons
V. 41 protons and 40 neutrons

A. I, II, III
B. III, IV
C.1, IV and II, V
D. 1, V and II. V
E.1. V​

Answers

Look for the ones with the same number of protons and different neutrons number

7. The image shows the effects of exposing the plants to different color of
lights. The size of the plant was measured and the number of leaves were
counted if they are alive or dead. Size of plants and number of leaves are
Size of Plant
Number of Leaves
Living or Dead?
science or
What’s the answer?

Answers

Answer:

An apple, potato, and onion all taste the same if you eat them with your nose plugged

Explanation:

Why can stars be called element factories?

Answers

Answer:

They came from the element factories we call stars. Stars are mostly hydrogen throughout most of their lifespans. They are driven by massive and continuous thermonuclear reactions and gravity. ... This extra heat begins to fuse helium atoms into heavier elements like carbon and oxygen and gives new life to the star.

Explanation:

Nearly all elements heavier than hydrogen were not created by the Big Bang. They came from the element factories we call stars. ... This extra heat begins to fuse helium atoms into heavier elements like carbon and oxygen and gives new life to the star. BTW I GOT THIS FROM SAFARI :)

What change would you expect on the rate of the SN2 reaction of 1-iodo-2-methylbutane with cyanide ion if the nucleophile concentration is halved and the alkyl halide concentration is doubled

Answers

Answer:

The rate of reaction remains the same, no change is observed

Explanation:

Remember that for an SN2 reaction, the rate of reaction depends both on the concentration of the alkyl halide and the concentration of the nucleophile.

Hence we can write; Rate = k [Alkyl halide][NaI]

This implies that if we half the concentration of the nucleophile and double the concentration of the alkyl halide, the rate of reaction just remains the same since the reaction is bimolecular and first order in both alkyl halide and nucleophile

WHAT IS A NEWTON!! specifically the definition!!!!

Answers

Answer:

Explanation:

the SI unit of force. It is equal to the force that would give a mass of one kilogram an acceleration of one meter per second per second, and is equivalent to 100,000 dynes.

Which pair of elements are most likely to form a molecular compound?

Nitrogen and Hydrogen

Calcium and Copper

Chlorine and Neon

Please help! I will mark brainliest if correct!

Answers

Answer: Two nonmetals.

Explanation:

Answer:The only pair of nonmetals is sulfur and fluorine.

Explanation:The pair of elements most likely to form a molecular compound with each other are two nonmetals.

The diagram illustrates photosynthesis. Which best describes what is happening in the area marked X?

Answers

Answer:

You forgot to include the diagram use snipping tool to take a picture and upload it

Explanation:

An aqueous solution is in equilibrium with a gaseous mixture containing an equal number of moles of helium, carbon dioxide, and nitrogen. Rank the relative concentrations of each gas in the aqueous solution from highest to lowest. An aqueous solution is in equilibrium with a gaseous mixture containing an equal number of moles of helium, carbon dioxide, and nitrogen. Rank the relative concentrations of each gas in the aqueous solution from highest to lowest.
[CO2][CO2] > [He][He] > [N2][N2] [N2][N2] > [CO2][CO2] > [He][He] [CO2][CO2] > [N2][N2] > [He][He] [He][He] > [N2][N2] > [CO2][CO2]

Answers

Answer:

[CO2] > [N2] > [He]

Explanation:

The relative concentration of CO2, N2 and He depends on the solubility of each gas in water. The more soluble in water a gas is, the greater its concentration in aqueous solution.

Among the gases listed, CO2 is most soluble in water hence it is expected to have the greatest concentration in solution followed by N2. Helium gas is insoluble in water hence it has the least concentration in the aqueous solution.

If a feather and in Marble are dropped at the same time from the same height explain. Which object would hit the floor first based on air resistance?​

Answers

Answer:

the marble would hit the floor first because the feather would be effected by air resistance

How is the periodic table generally arranged?

Answers

Answer:

It is generally arranged by the atomic number

Explanation:

What is the difference in drawing Lewis Dot
Structures for ionic and covalent bonds?

Answers

Answer:

In Lewis Dot Structure of Covalent compound it never contain any charge and for Ionic compounds always contain charges.

The Lewis Dot Structure for ionic compounds must demonstrate how the electrons are transported to create the ions in the compound. The Lewis Dot Structures of covalent compounds must demonstrate how the electrons are being shared to finish the octets of each atom in the molecule.

What is an ionic compound ?

A chemical compound known as an ionic compound is one that contains ions bound together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions, or cations and anions, the molecule is generally neutral.

The term "ionic bonding" refers to a bond in which the ionic character is greater than the covalent character, i.e., when there is a significant difference in the electronegativity of the two atoms, which makes the bond more polar (ionic) than in a covalent bond, where the electrons are distributed more evenly.

The Lewis structures are not frequently drawn for ionic compounds due to the electrical motion of electrons.

Thus, The Lewis Dot Structure for ionic compounds must demonstrate how the electrons are transported to create the ions in the compound.

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Which is the larger atom S or K

Answers

Answer:

I'm pretty sure k

Explanation:

I'm not for sure I'm trying to help

Answer:

Potassium

Explanation:

Atomic size decreases across a Period, from left to right as we face the Table, and INCREASES down a Group, a column of the Periodic Table.

Im confused please help :(

1.) When kinetic energy is high, velocity is high.
true or false

2.) When potential energy is high, velocity is at its highest.
true or false

Answers

Answer: #1: true

#2: false

Explanation: I’m not 100% sure though!

What is the first step when using a microscope?


A. Place the microscope slide on the stage

B. Plug the microscope in and turn it on

C. Switch to the low power objective lens

D. Secure the slide to the stage clips

Answers

Answer:

I think the answer is B :)

Answer:

the first step is B

Explanation: I'm on this lesson

The purpose for witch something is designed or exists

Answers

Answer:

to help

Explanation:

to help

The strength of an acid is affected by the polarity of the bond connected to the acidic hydrogen. The more highly polarized this bond, the more easily the hydrogen is ionized. Electronegative atoms or groups of atoms present in the structure of an acid can act to withdraw electrons and produce additional polarization. Two common groups of acids to which this principle can be applied are oxyacids and carboxylic acids. Arrange the following oxyacids in order of decreasing acid strength. Rank from strongest to weakest acid.

a. HBrO
b. HClO
c. HClO3
d. HClO2

Answers

Answer:

Explanation:

Oxyacids are acid containing oxygen; they are also known as acid-alcohol or acid-phenol. As said earlier, the strength of these acids increases with increases in the polarity of these compounds. So, what makes the polarity is as a result of the electronegative substituents attached to it. Halogen family possesses the highest electronegativity in the periodic table, and electronegativity decreases down the group.

The ranking of the oxyacids in order of decreasing acid strength from strongest to weakest acid is:

HClO3 > . HClO2 > HClO > HBrO

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Identify the correct sentence.A.The short poem Harlem by Langston Hughes is very powerful.B.The short poem Harlem by Langston Hughes is very "powerful."C.The short poem Harlem by Langston Hughes is "very powerful."D.The short poem "Harlem" by Langston Hughes is very powerful. Decide if the reflexive verb is conjugated correctly in the following sentence.Cmetelo! (comerse) Need help ASAP! Which sentence uses an objective tone?A-We will plant the best garden of any school in the area.B-The new campus garden will surely be envied by other schools.C - A garden would provide numerous benefits to the students.D-You will probably agree that gardens have many benefits. 7m-3n-4m-7n+3can someone tell me what is the answer please Find the slope of the given linear function shown in the graph? 20)German priest and professor of theology who started the Protestant Reformation.- Revolutionized the Christian faith when he criticized the Catholic Church and its practices.Published The Ninety-Five Theses in 1517.Which Christian leader and reformer is being described by these statements?A)John CalvinB)Martin LutherJohann TetzelD)Desiderius Erasmus Which force requires contact?A. The force of attraction between two massesB. The force produced by interactions between electrically charged objectsC. The force exerted by air as an object moves through itD. The force producers by interactions between magnetic objects Which list shows all the factors of 72?OA) 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72OB) 1, 2, 3, 4, 6, 9, 12, 18, 24, 36, 72OC) 1, 2, 3, 4, 5, 6, 8, 9, 12, 18, 24, 36, 72OD 1, 2, 3, 4, 6, 7, 8, 9, 12, 18, 24, 36, 72 What is the value of (2,820 8) 5? A weight lifter raises a mass of 50kg through a height of 2m. He does this 25 times in one minute. Find hisaverage power. Find the number which when increased by 12 % becomes 168. I NEED HELP ASAPPPPP!!!!!!! In the expression shown, nrepresents a rational number.7nWhat value of n makes theexpression a number less than7?A. 3/2B. 6/6C. 4D. 714 someone help me!!!?? Which number produces a rational number when added to 0.5? A. 1.73205081 B. 1/4 C. 0.54732871 D. 3 what year do you think C19 will end hopefully *PLEASE ANSWER, I NEED HELP*Which of the following graphs shows the solution set to t > 4 or t < -1? In which situation would osmosis most likely occur If three times a number is at least four or more than eight times the number, which of the following is true? A-The number is at least negative four-fifths. B- the number is at most four-fifths. C-The number is at least four-fifths. D-The number is at most negative four-fifths . HELP ASAP!!!One crate can store 12^3 toys. A warehouse receives 12^7 toys. Enter the number of cratesneeded to store all the toys the warehouse received.