Will these groups of elements form ionic or molecular compounds? sodium and Iodine 

Answer: C2Br6

Explanation:

Answer:

PUT THE TOOTHPAST ON CABBAGE AND CHECK IT OUT AFTER A DAY

Answer:

What are the characteristics of a revolver?

Explanation:

The revolver features several firing chambers located within a revolving cylinder. The cylinder rotates as the revolver is fired, lining up each bullet mechanically.

Answer:

D)The Earth moves in an elliptical orbit around the sun

The  statement earth moves in an elliptical orbit around the sun best describes the movement of earth around the sun.

Earth is the third planet of the solar system and the only astronomical object known to support life.

The movement of the earth around the sun in a fixed path or orbit is called Revolution. The axis of the earth which is an imaginary line, makes an angle of 66½° with its orbital plane.

Hence, option D is the correct answer.

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Answer:

Gjvb

Explanation:

Using the combined gas law equation as follows:

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (kPa)

P2 = final pressure (kPa)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to this question;

T1 = 300K

T2 = -73 + 273 = 200K

P1 = 303kPa

P2 = 202kPa

V1 = 2L

V2 = ?

Using the above formula:

303 × 2/300 = 202 × V2/200

606/300 = 202V2/200

Cross multiply;

606 × 200 = 300 × 202V2

121200 = 60600V2

V2 = 121200/60600

V2 = 2L

The new volume is 2L

Answer:

1.13moles

Explanation:

Given parameters:

Number of atoms  = 6.777 x 10²³ atoms

Unknown:

Number of moles  = ?

Solution:

A mole of a substance contains the avogadro's number of particles

       6.02  x  10²³ particles   = 1 mole

      6.777 x 10²³ atoms will contain [tex]\frac{ 6.777 x 10^{23} }{6.02 x 10^{23} }[/tex]   = 1.13moles

Answer:

cool but can we have a little bit bigger

Explanation:

Answer:

Temperatures in the mesosphere decrease with altitude. There are few gas molecules in the mesosphere to absorb the Sun's radiation, the heat source is the stratosphere below. The mesosphere is extremely cold.

Explanation:

Explanation:

քʀa ʋċ ʀɛsքօռɖɛʀ ɛ sօ ʟɛʀ ɛ ɛռtɛռɖɛʀ օ զʊɛ ʋċ զʊɛʀ ʋɛʀ ռa քɛʀɢʊռta aɨ ʋċ քɛsզʊɨsaʀ օ զʊɛ ʋօċɛ զʊɛʀ ʋɛʀ ɛ ʀɛsքօռɖɛ օxɛ

Answer:

this describes rotation

Explanation:

rotation means spinning on an axis, revolution means going in a circle around an object. a year would be a revolution and a day would be a rotation.

Answer:

calcium chloride and water

Explanation:

the reaction absorbed energy which means endothermic

Answer:

This is false.

Explanation:

This statement directly opposes the first law of thermodynamics which states that energy can neither be created nor destroyed, but can transfer from one source to another.

Answer:

B. convention

Explanation:

hope you get the right answer

Answer:

You could classify nuclear energy as nonrenewable because uranium and similar fuel sources are finite. On the other hand, some people consider nuclear energy renewable because the element thorium and other new technologies may provide infinite fuel needed to power nuclear reactors.

The change in color might indicating the formation of a new product. Hence, the color change indicates a chemical change.

A chemical change involves the breaking/ making or both of chemical bonds. Chemical changes results in formation of new products that have different properties and structure from the initial substances.

A physical change include change in size, shape, state etc. All phase changes such as melting, boiling, freezing are physical changes. Evolution or absorption of heat, conductivity, solubility etc are physical changes.

A change in color indicates that a new product with different color is formed in the system. Therefore, option c color change indicates a chemical change.

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Answer:

Only protons and neutrons contribute to an atom's mass value

Explanation:

Answer:

6

Explanation:

Answer:

Explanation:

c. - vaccine

b. - immunity

d. - phagocyte

f. - b cell

e. - t cells

a. active immunity

Answer:

The elements in this family are fluorine, chlorine, bromine, iodine, and astatine. Halogens have 7 valence electrons, which explains why they are the most active non-metals.

Explanation:

Answer:

Selenium

Explanation:

Explanation:

Cations are positively charged ions with fewer electrons than protons. To partake in reaction, metals lose electrons to achieve a stable octet configuration. It has lost valence electrons and wold have a positive charge associated with it.

Potassium is a group 1 element. A metal.

Potassium has 1 valence electron so it loses the valence electron to form a stable octet.

A potassium ion has a positive charge and therefore cannot be an anion but is a cation.

The group number pretty much denotes the number of valence electrons.

Group 1 = 1

Group 2 = 2

Group 17 = 7

Group 18 = 8

Answer:

The smallest atom you have listed would be lithium (Li).  

Explanation:

Lithium is the third smallest atom listed on the periodic table of the elements.  It has an atomic number of three, meaning it has three protons in it's nucleus.

Atom size (Atomic radius) increases from UP to DOWN in the same COLUMN(group) of the periodic table. For example, in the first group, the Atomic radius trend from smallest to greatest is: H (smallest) -- Li  -- Na -- K -- Rb -- Cs -- Fr (greatest).

Reason is, the increasing energy level (increases from n=1 to n=7) causes the shielding effect increase dramatically. And since the size of atom is mostly consist of electrons, more energy level is filled, the larger the atom will be.)

However, in the same ROW from left to right, the atomic size decreases as the number increases.   For example, Li #3, is larger than Flourine (F) with an atomic number 9 because they are on the same ROW.

Answer:

The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius

Explanation:

Answer:

25000 is the answer

Explanation:

The answer is 25000 hope this helps you

25,000N is the total force, the train's engine need to create so the train is going uphill at a constant speed.

A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it can be a push or perhaps a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force (formerly P).

The net force exerted on an object approximately equal to the rate where its momentum varies over time, according to the original formulation of Newton's second law.

The force by the train weight Fw= 150,000N

The force creates by the friction Ff=25,000N

total force =Fw + Ff

                = 150,000N+25,000N

                = 25,000N

Therefore, 25,000N is the total force.

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Answer:

The answer I believe is B. Erosion

Explanation:

Just sounds better than all the other choices.

Answer:

erosion b

Explanation:

it breaks down the rocks i remembered this in 4th grade :)

Answer:

0.84

Explanation:

total heat energy =mass ×specific heat capacity (4.2kJ)×temp change

mass=25g convert to kg to get 0.025

specific heat capacity is 4.2

temp change=36.0-24.0=8.0

q = mC∆T

m=25.0

c=24.0

ΔT=36.0

25.0 * 24.0 * 36.0 = 21,600 jules

The equation q =   MC ∆ T, where m is the sample mass, c is the specific heat, and  ΔT is the temperature change, can be used to determine the amount of heat acquired or lost by a sample (q).

How can you figure out how much energy was consumed?

This is simple to perform; to calculate the amount of heat absorbed, multiply the substance's heat capacity by its mass and the temperature change.

The specific heat capacity of a substance is the amount of energy needed to raise the temperature of 1 gram of that substance by 1 degree Celsius. With a value of 4.18 J/g/°C, water has one of the highest heat capacities.

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Answer:

Atomic mass: 22.989769 u

Explanation: