3. Elements in the s and p blocks of the periodic table are called
a. alloys.
b. main-group elements.
C. metals.
d. transition metals.

Answers

Answer 1

Answer:

The answer is B: main-group elements.

Explanation:

Answer 2

Answer:

b

Explanation:


Related Questions

Please help!! I don’t know what to do.

Answers

Answer:

C

Explanation:

No reaction because not enough moles of silver are present for the reaction to occur.

3. What must you have when you pray?​

Answers

Answer:

when you pray you will feel a peace and happiness in your heart

This element has an atomic number lower than aluminum and is in group 14

Answers

Answer:

that is impossible. the atomic number can only go up each group



Four substances at the same temperature absorb equal

amounts of energy. The specific heat of the four

substances are listed below.

Substance

A. 1.45 J/g °C

B. 2.32 J/g °C

C. 0.98 J/g °C

D. 1.95 J/g °C

Which substance would show the GREATEST increase in

temperature?

A

B

C

D

Answers

Answer:

its that DDDDDD

Explanation:

i know this because its that DDDDDDDD

11. If a hypothetical element consisted of three isotopes in the following relative abundance, what would the atomic
mass of the element be?
30.00% 30.00 amu
50.00% 32.00 amu
20.00% 35.00 amu

A. 33.00 amu
B. 32.25 amu
C. 32.00 amu
D. 31.50 amu
E. 31.00 amu

Answers

Answer:

hiroghlipical

Explanation:

new word i just made

Give one example of a pure substance.

Answers

Answer:

some example includes:

gold, copper, oxygen, chlorine, diamond

Explanation:

Which of the following correctly compares the radii of Na and Na+? (4 points)

Group of answer choices

Na has a smaller radius than Na+ because Na has expanded its electron cloud.

Na has a larger radius than Na+ because Na has lost its outermost energy shell.

Na has a smaller radius than Na+ because Na+ has expanded its electron cloud.

Na has a larger radius than Na+ because Na+ has lost its outermost energy shell.

Answers

Answer:

D. Na has a larger radius than Na+ because Na+ has lost its outermost energy shell.

Explanation:

The radius is larger because the diameter of Na+ is larger.

Sodium has smaller atomic  radius than sodium cation because sodium has expanded electron cloud.

What is atomic radius?

Atomic radius is defined as the  distance between outermost shell and the nucleus. Atomic radius varies across the periodic table where in groups it increases due to the fact that new shells are added on moving sown the group.

While in a period it decreases from left to right across the periodic table as electrons are added to the same shell which causes contraction of the atom.In case of comparison between an atom and a cation an atom has smaller atomic radius due to presence of electrons while in case of ions atomic radius is smaller as they have less number of electrons.

Atoms have expanded electron cloud while the electron cloud in case ions is small , the reason being the presence of large number of electrons in case of atoms and less number of electrons in case of ions.

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What do you predict would happen if you brought a negatively charged balloon next to an uncharged piece of paper?

A. The balloon will attract the paper.
B. The balloon will repel the paper.
C. Nothing will happen.
D. The paper will repel the balloon.

Answers

Answer: A

Explanation:

Answer:

B. The ballon will repel the paper

If an object absorbs all the light that hits it, the object appears to be

Answers

reflective

make me brainliest pls

A wave is moving towards shore with a velocity of 5.0 MS if it’s frequency is 2.5 Herz what is the wave length

Answers

Answer:

2 m

Explanation:

The wavelength of a wave can be found by using the formula

[tex]\lambda = \frac{c}{f} \\[/tex]

where

c is the speed of the wave

f is the frequency

From the question

c = 5 m/s

f = 2.5 Hz

We have

[tex] \lambda = \frac{5}{2.5} = 2 \\ [/tex]

We have the final answer as

2 m

Hope this helps you

What property determines whether an acid is a strong acid or a weak acid?
The dissociation of the ions
The total number of molecules
The pH of the acid

Answers

Answer:

the pH of the acid is the property that determines whether an acid is a strong acid or a weak acid

How much mass does 1 mol of O2 gas have?

Answers

Answer: 15.99 x2g

Explanation:

please anyone please this is due today!! help for a BRAINLIEST
For today's assignment, you need to balance and classify each of the following equations as synthesis, decomposition, single replacement, double replacement, or combustion.

Answers

Answer:

Explanation:

Im sorry all i know is that #3 is for sure combustion

What's a suitable assumption for a simple distillation lab?​

Answers

Answer:

Must be stable and relatively insoluble in boiling water.

Explanation:

it must be stable and relatively insoluble in boiling water and a must-have vapor pressure in boiling water that is of the order atmosphere at or more compound satisfy these conditions that will generally not separate from each other but we'll be separated from everything else.

How many eggs are in 3 dozen eggs? Use the dimensional analysis for this for practice.

Answers

Answer:

36 eggs

Explanation:

12 eggs in each carton

12 + 12 + 12 = 36 eggs

or 3 * 12 = 36 eggs

Hope this helps, have a nice day/night! :D

The difference between Physical/Chemical properties and Physical/Chemical changes

Answers

Physical changes can be reversed and chemical changes can’t be reversed. A physical property is a characteristic which can be identified without changing the substance but to identify a chemical property, you do have to change the substance.

Physical changes can be reversed and chemical changes can’t be reversed. A physical property is a characteristic which can be identified without changing the substance but to identify a chemical property, you do have to change the substance.

how many moles of iron are present in 3.15 × 10^24 atoms of iron?

Answers

Answer:

5.23 moles

Explanation:

How many moles of iron are present in 3.15 × 10^24 atoms of iron?

1 mole has 6.02 X 10^23 particles

so

3.15X10^ 24 atoms =( 3.15 X 10^24)/(6.02 X 10^23) =(3.15/6.02 )X 10 =

5.23 moles

at 25°c the heat of fusion of aluminum is 10.6 kj/mol and the heat of sublimation is 326.4 kj/mol. what is the heat of vaporization of aluminum at 25°c?

Answers

The heat of vaporization of aluminium at 25 °C is 315.8 kilojoules per mole.

The sublimation is the phase change of a substance from solid to gas, the fusion is the phase change of a substance from solid to liquid and the vaporization is the phase change of a substance from liquid to gas. The heat of vaporization is the difference between the heat of sublimation and the heat of fusion, that is to say:

[tex]h_{v} = 326.4\,\frac{kJ}{mol}-10.6\,\frac{kJ}{mol}[/tex]

[tex]h_{v} = 315.8\,\frac{kJ}{mol}[/tex]

The heat of vaporization of aluminium at 25 °C is 315.8 kilojoules per mole.

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82. How many moles of calcium are in 3.82g of calcium?

Answers

Moles= mass/Mr
Moles= 3.82/40
Moles= 0.0955 mol

What increases the concentration of H+ in water ?

Answers

Answer:

Acid

Explanation:

acid
Non-neutral pH readings result from dissolving acids or bases in water. An acid is a substance that increases the concentration of hydrogen ions (H+) in a solution, usually by having one of its hydrogen atoms dissociate.


What will be the primary result of the continuation of the
geologic processes indicated at this location?
Earth's magnetic field will reverse direction.
New oceanic crust will form.
o Continental crust will be forced downward.
Earth's circumference will increase.

Answers

Answer:

B

Explanation:

new oceanic crust will form.

The formation of a new oceanic crust will be the primary result of the continuation of the geologic processes. Therefore, option (B) is correct.

What is the oceanic crust?

The oceanic crust can be described as the uppermost layer of the oceanic portion of the tectonic plates. The oceanic crust is composed of the upper oceanic crust, with pillow lavas complex, and the lower oceanic crust, made of troctolite, and ultramafic cumulates.

The oceanic crust lies above the rigid uppermost layer of the mantle. The crust and the rigid upper mantle layer together compose the oceanic lithosphere.

The oceanic crust is rich in iron and magnesium and composed of mafic rocks. It is thinner than the continental crust less than 10 Km thick but it is denser with 3.0 g/cm³ as opposed to the continental crust.

The oceanic crust displays a symmetrical pattern of positive and negative magnetic lines emanating from the mid-ocean ridge.

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The majority of which type of dancing was created in African American communities? Tap Ballet Ballroom Swing. Plz help thx <3

Answers

Answer: if it’s a multiple choice then it should be swing dances

Explanation:While the majority of swing dances began in African American communities as vernacular African American dances, some influenced swing-era dances, like Balboa, developed outside of these communities.

1. Which of these is an agent of chemical weathering?

copper patina
iron oxide
acid rain
iron

Answers

Answer:

Test answers

1. Water carving out a limestone cave

2. Oxidation

3. Acid rain

(Got 100%)

Explanation:

The primary agents of chemical weathering are water, oxygen and acids. So acid rain is an agent of chemical weathering. Option C is correct.

Which are the agents of chemical weathering ?

Water, and many chemical compounds found in water, is the main agent of chemical weathering.  One of the most abundant rock-forming minerals, chemically reacts with water and water-soluble compounds to form clay.

Water contains many weak acids such as carbonic acid. The primary agents of chemical weathering are water, oxygen and acids.

These react with surface rocks to form new minerals that are stable in, or in equilibrium with, the physical and chemical conditions present at the earth's surface.

Hence, option C is correct.

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Plz help I’m pretty confused on this question

Answers

Answer:

Bohr model A

Explanation:

It has more valance electrons therefore has more interaction between the atoms and has more electronegativity.

What is the relationship between Avogadro number, mole, and mass number?

Answers

Avogadro's number is a proportion that relates molar mass on an atomic scale to physical mass on a human scale. Avogadro's number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance. It is equal to 6.022×1023 mol-1 and is expressed as the symbol NA.

please help me

Type the correct answer in the box. Spell all words correctly.

What does Dalton's atomic theory propose?

A ______ causes rearrangement of atoms.​

Answers

chemical reaction :)

given that the radiusof anion a2- is 0.290 nm, what would you expect the radius of a and a2+ to be

Answers

This problem is providing the ionic radius of an anion, A²⁻ as 0.290 nm and asks for that of the cation A²⁺ in comparison to the former.

Firstly, we need to recall the concept of ionic radius, as the distance between the nucleus and the outermost electron shell of an ion. In such a way, we can have two scenarios:

1. Anions result from the gain of electrons exhibited by a nonmetal, which means they turn out bigger than the neutral atom.

2. Cations result from the loss of electrons exhibited by a metal, which means they turn out smaller than the neutral atom.

With the aforementioned, we infer that the cation A²⁺, will me smaller than the anion A²⁻, which means it will have an ionic radius smaller than 0.290 nm.

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A sample of H2 gas (12.28 g) occupies 100.0 L at 400.0 K and 2.00 atm. A sample weighing 9.49 g occupies ________ L at 353 K and 2.00 atm.

Answers

Considering the ideal gas law, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P× V = n× R× T

In this case, you know:

P= 2 atmV= ?n= [tex]9.49 gramsx\frac{1 mole}{2 grams} = 4.745moles[/tex] being 2g/mole  the molar mass of H2, that is, the amount of mass that a substance contains in one mole.R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 353 K

Replacing:

2 atm× V = 4.745 moles× 0.082[tex]\frac{atmL}{molK}[/tex]× 353 K

Solving:

V = (4.745 moles× 0.082[tex]\frac{atmL}{molK}[/tex]× 353 K)÷ 2 atm

V= 68.67 L

Finally, a sample weighing 9.49 g occupies 68.67 L at 353 K and 2.00 atm.

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The same quantity of each solute is added to water. Which solution will have the greatest number of H30+ ions at equilibrium?
(1 point)
O weak acid
O strong acid
O strong base
O weak base

Answers

Answer is strong acid

Calculate the energy of a photon of light emitted from a hydrogen atom when an electron falls from level n

Answers

Answer:  E

1

E

4

=

Δ

E

=

2.18

×

10

18

J

(

1

n

2

f

1

n

2

i

)

=

2.18

×

10

18

J

(

1

1

2

1

4

2

)

=

2.18

×

10

18

J

(

15

16

)

=

 

2.04

×

10

18

J

After you obtain the energy, then you can realize that that energy has to correspond exactly to the energy of the photon that came in:

|

Δ

E

|

=

E

photon

=

h

ν

=

h

c

λ

where  

h

is Planck's constant,  

c

is the speed of light, and  

λ

is the wavelength of the incoming photon. Thus, the wavelength is:

λ

=

h

c

E

photon

=

(

6.626

×

10

34

J

s

)

(

2.998

×

10

8

m/s

)

2.04

×

10

18

J

=

9.720

×

10

8

 

m

=

 

97.20 nm

Explanation:

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A pool with a square bottom is to have a volume of 2000 cubic feet. The owners plan to use a fancy tile to complete the pool. The sides of the pool will cost $80 per square foot and the bottom of the pool will cost $40 per square foot. Find the pool dimensions that will minimize the cost of construction. What is a settlement pattern What is the answer to the first one? births that take place prior to ________ weeks of gestation are considered to be preterm births. I already Have the answer but can u guys show the work? True or False: Increases in the width of long bones is a result of bone modeling. Which number is a zero of the given function?g(x) = (x^2 36) (x + 7) Imagine if Rutherford conducted his scattering experiment, and his prediction about the movement of alpha particles held true Which of the other models or scientificobservations would have also been confirmed?The Bohr model would have been confirmed because it shows electrons spinning around a nucleusThe plum pudding model would have to be true as well because it shows that electrons are scattered within an atom,The Bohr model would have been confirmed because it shows electrons occupying random positions inside the electron cloud.The plum pudding model would have to be true as well because it shows that all positive charge is concentrated at the center of the atom Complete the following paragraph about the Founders.The Founders is a collective term used to refer to the people, all white men, who were important in the creation of the United States. This meant they were seeking independence from Great Britain at the same time many of the Founders held people in bondage. This reflects a BLANK . About BLANK of the Founders were enslavers.BLANK1 OPTIONS 1. Contradiction, Collaboration, CongruenceBLANK2 OPTIONS 2. Half, 75%, 10% Select the correct answer. What does the passage imply about children and learning? A. Children are usually rowdy so teachers need to be strict disciplinarians. B. Children are overly passive in school and therefore do not learn well. C. Children who learn facts and conform will likely succeed in life. D. Children would be best served if allowed to develop as individuals. PLS NEED HELP!!!!!!Read the sentence below and then answer the question:"Kyle and his frog were happily eating a slice of yellow cake."What part of speech is the word "eating" in this sentence?adjectivenounverbadverb Explain The element lithium has two common isotopes: Li6 and Li7 If the average atomic mass of lithium is 6.94004 u, determine its percent isotopic step by step please urgently Examine the model here showing the Milky Way galaxy. Which statements are accurate regarding the galaxy? Select all THREE thatapply. Matthew Bishop from the book the cradle is what type of character A fighterB heroC dangerousD lovingE All of the above 2/5+3/10/7/9pls hlp Sensory adaption.What's a personal experience you've had with this?Easy pts.! Feel free to make it up if you want :)It's for my Psychology class and I dk wt to write lolI will give Brainliest too Which statement describes the sequence -9, -3, 3, 9, 15, ...?O A.an arithmetic sequence with common difference -9OB.an arithmetic sequence with common difference 3C.an arithmetic sequence with common difference 6O D. not an arithmetic sequence All of the following are loss of control risks except ________. (1pts) Question 36 - All of the following are loss of control risks except ________. high unit cost forever vendor in driver's seat identity changes technology direction enhancements in wrong priority Define radical ?Wite its type with example. Name 5 considerations the president must take when picking the cabinet