which two elements are most likely to have similar physical properties?
pls help:)​

Answer:

They are made up of elements.

Explanation:

An atom is the smallest particle of matter that still retains the property of the element.

Two or more atoms combine to form elements or compounds. Elements are formed by two or more similar atoms, while compounds are formed by two or more different elements.

Atoms are made up of subatomic particles, protons, electrons and neutrons. Electrons are negatively charged, protons are positively charged while neutrons have no charge.

I hope this help! :)

Yes.Nuclear energy is renewable

Answer:

1.25 x 10^15Hz

Explanation:

c = frequency x wavelength

c is the speed of light, which is equal to 3.00 x 10^8 m / s

frequency = c /wavelength

= (3.00 x 10^8m /s) / (2.40 x 10^-5 cm x 1 m /100cm)

= (3.00 x 10^8 m/s) / 2.40 x 10^-7m

= 1.25 x 10^15/s 1 / s = 1Hz

So, the Frequency = 1.25 x 10^15Hz

I hope this helped :)

.Answer:

Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.

Explanation:

Answer:

A Transverse Wave

Answer:

it is C

Explanation:i had this on my test and got it right lol

Explanation:

Keq =[NO2] ^2 / [N2 O4]

4.64 x 10^-3

Answer:helium or the noble gases

Explanation: The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest ionizing energy

Answer:

When mensuration volume of air within the flask at the primary temperature, a volume of 250mil was recorded, referred to as V1. The temperature of the air within the flask in boiling water was recorded as 99ᵒC, referred to as T2. so as to seek out the right calculations, 99ᵒC must be born-again to Kelvin by adding 273.

the primary temperature in Kelvin is 372K. the worth of V1/T1, may be found by swing 250/372. This involves a complete of zero.67. the quantity of the air within the flask of the second temperature was 177 mil, referred to as V2.

The temperature of the air within the cooled flask is 7ᵒC, referred to as T2. 7ᵒC must be born-again to Kelvin by adding 273 that involves a final total of 280K. the worth of V2/T2, found by swing 177/280 involves a complete of zero.63.

The close to equality in numbers may be attributed to Charles Law. Charles Law states that “as the temperature will increase, thus will the quantity of a gas sample once the pressure is command constant”.

The results of V1/T1 and V2/T2 were terribly on the brink of one another. this can be because of the very fact that this experiment was worn out as a closed system. In Charles Law, if there's a closed system the 2 ratios ought to have equal numbers. {this is|this is often|this may be} why it can be expected for the magnitude relation numbers to be terribly equal.

Answer:

Explanation:

I can help you

Answer:

It is 12.00 g of carbon-12.

Explanation:

On yeeeeeeeeeeeee

Answer: False

Explanation: Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate

Answer:

-ite --> Anionite

Explanation:

Feel free to give brainliest.

Have an awesome day!

Answer:

false

Explanation:

Answer:

False.

Explanation:

The sum of potential energy and the kinetic energy of an object is mechanical energy.

Hope that this helps!!! :)

Answer:

B.

Explanation:

Mutualism is the idea that both organisms benefit from an interaction. In example B, the honeybee benefits because they receive nectar, while the flower benefits in being pollinated.

Answer:

True

Explanation:

Alkaline earth metals are found in the second group on the periodic table. They are made up of elements:

 Beryllium

 Magnesium

 Calcium

 Strontium

 Barium

  Radium

These elements have two valence electrons in their outer most shell. Together with group one elements they are s-block elements.

Answer:

Chlorine and Bromine are in the same group

Answer:

I think fluorine and neon

Answer:

43.84 g/mol

Explanation:

We use the ideal gas law to find the number of moles of gas present.

So PV = nRT where P = pressure of gass = 0.757 atm, V = volume of gas = 220 mL = 0.22 L, T = temperature of gas = 25 °C = 273 + 25 = 298 K and R = molar gas constant = 0.082 L atm mol⁻¹K⁻¹.

So, n = PV/RT = 0.757 atm × 0.22 L/(0.082 L atm mol⁻¹K⁻¹ × 298 K) = 0.16654 L atm/24.436  L atm mol⁻¹ = 0.00682 mol.

Since mass of gas m = 0.299 g

and n = m/M where M = molar mass of gas

So, M = m/n

\= 0.299 g/0.00682 mol

= 43.84 g/mol

So, the molar mass of the gas is 43.84 g/mol

Answer: Barium Oxide

We know that:

James mixed Ba + O²

Now, let's see what will happen when he does mix it.

The Barium will give it's electrons up to the oxide.

The Oxide and Barium will both reach noble gas status.

In the end, James will get Barium Oxide.

Best of Luck!

Answer: There are many ways. (Check Explanation)

Explanation: Electrons are found outside of the nucleus. Now in the middle of the nucleus there are protons in neutrons. The way to determine the number of neutrons in the Bohr Model are many ways.

Number one, if the neutrons, protons, and electrons were color coded, take away the electrons and you are left with the 2. Then find out which color corresponds to the neutron.

If it isn't color coded, then the protons and electrons should usually be marked with either + or - on it. The one without any of this and that is in the nucleus is the neutron. Last but not least, on some of the models, it can show many protons or neutrons are in the nucleus. For example the potassium bohr model. (Check image) On here, 19+ means 19 protons and 20N means 20 neutrons.

Answer:

23

Explanation:

According to the mole concept, there are 0.541 moles which are equal to 89.23 g of calcium nitrate.

A Mole is defined as the unit of amount of substance . Mole is the quantity  which is a measure of amount of substance of how many elementary particles are present in a given amount of  substance.

Mole is defined as exactly 6.022×10²³ elementary entities. The elementary entity can  either be a molecule, atom or an  ion depending on the type of substance in which it is present. Amount of elementary entities present  in a mole is called as Avogadro's number.

Mole is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For many of the the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound  which is measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles = mass/molar mass= 89.23/164.88=0.541 moles.

Thus, there are 0.541 moles which are equal to 89.23 g of calcium nitrate.

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The law of conservation of mass is also called the law of conservation of matter. When a chemical equation is balanced then it obey the law of conservation of mass.

The law of conservation of mass was postulated by the scientist A. Lavoisier. It states that in a chemical reaction, the total mass of the products is equal to the total mass of the reactants.

In a balanced chemical equation, the mass of the reactants and products on either side of the equation will be equal. In other words, matter is neither created nor destroyed in a chemical reaction.

A balanced chemical equation also contains the same number of atoms of reactants and products on both sides. An equation is balanced by adding stoichiometric coefficients to the reactants and products.

Thus it obey the law of conservation of mass.

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The reactant of a chemical reaction is one of the two or more substances in a chemical reaction. This image should help:

Answer:

B

Explanation:its the best answer

The most diverse offspring is produced when bees bringing pollen from the flower of one plant to the flower of another plant where, the new flower made will show a characteristic of both plants?

Pollination is the process of transferring pollen grains from the anther of the flower to the female stigma portion. This is a mechanism to create offsprings of the plants.

Pollination can be occurred through various agents such as insects, wind, water etc. Some plants contains both male and female flower within it and those are self pollinating.

Bees and butterflies are the main pollinating agents for plants. When they bring the pollen grains from one plant to another plant's flower the resulting offspring will have diverse properties which are mix of each plants.

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Answer:

It’s true ( pure).

Explanation:

An element is defined as a pure substance that is not chemically combined with any other elements. An element comprises of mainly the sane type of atoms.

While a compound is a substance that consists of two or more elements which are chemically combined together. This is the main difference between an element and a compound.

Answer:

4.7 x 10^14 Hz

Explanation:

From Bohr's theory, the energy absorbed or emitted (ΔE) by an atom transiting from one energy level to another is given as;

ΔE = E4 - E2

Where;

E4 = energy corresponding to the energy level n=4

E2 = energy corresponding to the level n= 2

ΔE = (-2.10 x 10-19) - ( - 5.20 x 10-19)

ΔE =3.1 x 10-19

But

ΔE = hf

h = Plank's constant

f= frequency of photon absorbed

f = ΔE/h = 3.1 x 10-19/6.6 x 10-34

f = 4.7 x 10^14 Hz

Answer: Scientists generally thought atoms were the smallest particles that could not be broken down any further.

Explanation: Trust me

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Scientists generally thought atoms were the smallest particles that could not be broken down any further.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

Before J.J. Thomson began gathering evidence about electrons in 1897. Scientists generally thought atoms were the smallest particles that could not be broken down any further.

Therefore, Scientists generally thought atoms were the smallest particles that could not be broken down any further.

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Answer:

2Mg + O2 = 2MgO

Explanation:

Al + 3F2 = AlF3 ..... F has 6 on the left and 3 on the right.

Na + F2 = 2NaF ..... Na has 1 on the left and 2 on the right.

2Al + 3O2 = Al2O3 .... O has 6 on the left and 3 on right.