How are gases and liquids different from each other? O A. Liquids can change volume, and gases cannot. B. Gases can change shape, and liquids cannot. C. Liquids can change shape, and gases cannot. D. Gases can change volume, and liquids cannot.​

Answer:

It is one and two

Explanation:

When you burn something it lights up  

Answer:

coochie man? lol it's probably D or B :D

Answer:

The cube

Explanation:

When the cube is put on the triple beam balance it gives the mass of 429.3

Answer:

You included no options however the elements with 6 Valence electrons are;

Valence electrons refer to the electrons an element has on its outermost shell. The number of these electrons determines the charge that an electron will carry as it seeks stability.

It also determines which group the element will be in in the Periodic table. Elements with 1 valence electron for instance will be in Group 1 and elements in Group 16 will have 6 valence electrons.

Answer:

there are three different subatomic particles inside them: the protons, neutrons, and electrons

Answer : The correct option is A: 20 km/h, B: 10 km/h

Explanation :

Speed : It is defined as the distance traveled per unit time.

Formula used:

[tex]S=\frac{d}{t}[/tex]

where,

S = speed

d = distance

t = time

First we have to calculate the speed of vehicle A.

Given:

Distance of vehicle A = 50 km

Time of vehicle A = 2.5 hr

Now putting all the given values in the above formula, we get:

[tex]S=\frac{50km}{2.5hr}=20km/hr[/tex]

Now we have to calculate the speed of vehicle B.

Given:

Distance of vehicle B = 50 km

Time of vehicle B = 5 hr

Now putting all the given values in the above formula, we get:

[tex]S=\frac{50km}{5hr}=10km/hr[/tex]

Therefore, the speed of vehicle A and B is 20 km/hr and 10 km/hr respectively.

Scientists use a two-name system called a Binomial Naming System. Scientists name animals and plants using the system that describes the genus and species of the organism. The first word is the genus and the second is the species.

Answer:

b

Explanation:

jus bc

Fluorine F₂ is the correct formula for two atoms in sharing of electrons as they have covalent bond among them. Therefore, option (A) is correct.

A covalent bond is created through sharing of electrons between different or the same kinds is known as a covalent Bond.

A covalent bond has equal sharing of electrons among bonded atoms. The pair of electrons which is shared between atoms is known as shared pair.

Sharing of electrons will help atoms to attain stability in their valence shell as noble gases. Atoms share their electrons with the other atoms in a way so that both atoms can gain octet configuration in their valence shell.

The bond between two fluorine atoms is a covalent bond formed by sharing of electrons. The Bond between sodium and chlorine in NaCl, KBr, and CaCl₂ is an ionic bond formed by the complete transfer of electrons.

Learn more about the covalent bond, here:

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Answer:

See detailed explanation.

Explanation:

Hello.

In this case, since the electron configuration of potassium whose atomic number is 19 turns out:

[tex]K^{19}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^1[/tex]

We can see that the last level is 4 which has one electron, meaning that potassium has one valence electron. Moreover, since bromine's atomic number is 35, its electron configuration is:

[tex]Br^{35}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^5[/tex]

We can see that the last level is also 4 and it has 2+5 = 7 valence electrons. In such a way, we infer that the valence electrons are computed by the electrons at the outer or last energy level of an element.

Regards.

Answer:

7

Explanation:

Answer:

s=d/t

s=speed

d=distance traveled

t=time elapsed

Answer:

Explanation:

Thank you ☺️☺️

Answer:

true

Explanation:

Answer:

False

Explanation:

Answer:

0.639

Explanation:

Pouring cold water into your hot coffee is convection. Therefore, option B is correct.

Convection can be explained as the transfer of heat from one place to another because of the movement of fluid. Convective heat transfer can be defined as the combined processes of conduction and advection.

Gases as well as liquids are not good conductors of heat under normal pressure and temperature conditions, but they can easily transfer heat from one region to another region.

Convection takes place through diffusion but does not take place in solids substances, as there is no movement of constituent particles takes place. The diffusion of heat energy that occurs in solids is called thermal conduction.

Heat energy transfer that takes place between a surface and a liquid when they come in contact with the surface is called convection heat transfer.  Therefore, heat transfer takes place through convection when pouring cold water into hot coffee.

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Answer:

the answer is 53.524 kg

Group 17 elements called halogens . All halogens have the same number of valence

electrons

Answer:

C02+2CL2 = O2+CCL4​

Explanation:

the co2 gave its carbon atom to the CL2 + CCL4​

Answer:

d. ii and iii

Explanation:

Both the Bohr model and the wave (quantum) mechanical  models of the atom recognize the principal quantum number n. The principal quantum number shows the shell or energy level where an electron may be found.

The energy levels are arranged in increasing order of magnitude. That is n=1 >n=2=n=3 etc

Answer:

0.01 M

Explanation:

The chemist is performing a serial dilution in order tyo obtain the calibration curve for the instrument.

First we must obtain the concentration of the solution in the 250ml flask from

C1V1 = C2V2

Where;

C1 = concentration of the stock solution

V1 = volume of the stock solution

C2 = concentration of the diluted solution

V2= volume of the diluted solution

2.61 × 10 = C2 × 250

C2 = 2.61 × 10/250

C2 = 0.1 M

Hence for solution in 100ml flask;

0.1 × 10 = C2 × 100

C2 = 0.1 × 10/100

C2 = 0.01 M

Answer:

Carotenoids absorb light in the blue-green and violet region

Explanation:

Carotenoids are organic pigments of yellow, orange, and red colour that are produced by plants and algae, bacteria, and fungi. Such organic pigments give the characteristic colour to pumpkins, corn, tomatoes, shrimp, and lobster. Carotenoids are also called as tetraterpenoids.

Beta-carotene and lutein are carotenoids. Carotenoids absorb light in the blue-green and violet region.

Answer:

C) Covalent bonds come about because of a sharing of electrons; ionic bonds do not.

Explanation:

There are two main types of chemical bonds- covalent and ionic/electrovalent bonds.

Ionic bond: Ionic or electrovalent bonds are characterized by the transfer of electrons from electropositive atoms (metals) to electronegative atoms (non-metals). The metal atoms after donating their electrons become positively charged ions (cations) while the non-metal atoms after accepting electrons become negatively charged ions (anions). Strong electrostatic forces of attraction constitutes ionic bonds.

Covalent bond: Covalent bonds are formed by the sharing of electrons by the atoms involved in the bond; usually between atoms of comparable electronegativities or atoms of the same element. The shared electrons are contributed by each of the atoms involved in the bonding or may be contributed by only one of the atoms. In covalent bonding, molecules rather than ions are formed.

Answer:

From 22.9 g of HF 0.575  moles of tin(II) fluoride are produced.

Explanation:

Given data:

Moles of tin(II) fluoride produced = ?

Mass of hydrogen fluoride react = 22.9 g

Solution:

Chemical equation:

SnO + 2HF    →    SnF₂ + H₂O

Number of moles of HF:

Number of moles = mass/ molar mass

Number of moles = 22.9 g/ 20 g/mol

Number of moles = 1.15 mol

Now we will compare the moles of SnF₂ with HF.

              HF           :             SnF₂

               2             :               1

            1.15            :             1/2×1.15 = 0.575 mol

Thus, from 22.9 g of HF 0.575  moles of tin(II) fluoride are produced.

Answer:carbin dioxide co^2

Explanation:

Answer:

[tex]k=2.45M^{-2}s^{-1}[/tex]

Explanation:

Hello.

In this case, considering the given specific orders of reaction, we can write the rate law as:

[tex]r=k[A][B]^2[/tex]

Thus, considering the concentrations of A and B to be 0.200 M and 0.350 M respectively and a rate of 0.060 M/s, the rate constant turns out:

[tex]k=\frac{r}{[A][B]^2}\\ \\k=\frac{0.060M/s}{(0.200M)(0.350M)^2} \\\\k=2.45M^{-2}s^{-1}[/tex]

This is what we know as a third-order reaction since the specific orders both add to 3.

Best regards.

A balanced chemical equation for the standard formation reaction of gaseous hydrogen iodide is H₂(g) + I₂(g) → 2HI(g).

Balanced chemical reactions are those in which equal amount of each entities will present on both sides of the reaction.

Formation of gaseous hydrogen iodide takes place by the mixing od hydrogen gas and iodine gas and balanced chemical equation for the formation of HI will be represented as:

H₂(g) + I₂(g) → 2HI(g)

So, required equation is H₂(g) + I₂(g) → 2HI(g).

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