Give two similarities between Be and Be2+

Answer:

V = 43.8cm³

Explanation:

To calculate the volume of the sample we must first make sure the density and mass are in compatiple units. We can do this by changing the density to g/cm³ or the mass to kg.

[tex]\frac{921kg}{1m3}[/tex] × [tex]\frac{1000g}{1kg}[/tex] × [tex]\frac{1m3}{1000000cm3}[/tex] = 0.921g/cm³

Now we can use this and the mass given to get volume.

[tex]\frac{0.921g}{1cm3}[/tex] = [tex]\frac{40.3g}{V}[/tex]

40.3g = (0.921g)(V)

V = 43.8cm³

V = 43.8cm³

Mass per unit volume is known as density.

To calculate the volume of the sample we must first make sure the density and mass are in units. We can do this by changing the density to g/cm³ or the mass to kg.

[tex]921 kg/m^{3} /times\frac{1000\ g}{1\ kg} \times\frac{1\ m^{3} }{1000000\ cm^{3} } =0.921\ g/cm^{3}[/tex]

Now we can use this and the mass given to get volume.

[tex]\frac{0.921\ g}{1\ cm^{3} } =\frac{40.3\ g}{V} \\\\ V=43.8\ cm^{3}[/tex]

To know more about:-

brainly.com/question/25038476

Answer:

There is 1 lead (Pb) element, 2 nitrogen (N) elements and 6 oxygen (O) elements.

Explanation:

Brackets in chemistry work the same like in maths. You multiply each element in the bracket depending on the power. In this case, we have a nitrogen atom and three oxygen atoms, in brackets, with a power of 2. You multiply the nitrogen atoms by 2, ending up with 2 nitrogen atoms, and you multiply the oxygen atoms by 2, ending up with 6.

Answer: Pb2N4O12

Explanation: Pb = 1 X 2= 2 N = 2 x 2 = 4 O = 2+8+2 = 12

Answer:

Water

Explanation:

A compound can be defined as the bonding of two or more atoms, where at least two are different types of atoms. That is, they are atoms from more than one element. Water fits this definition as it is the bonding between two hydrogen atoms and one oxygen atom, with chemical formula H2O. Iodine and gold are elements and therefore are only single atoms. Sand is classified as a mixture and therefore is not the correct option.

Answer:

The length of the fence is 22.5ft and the width of the fence is 7.5ft.

Explanation:

To solve this problem we will turn this question into an equation.

The equation for the perimeter of a rectangle is 2l + 2w = perimeter.

In the question we were given the perimeter so we can go ahead and plug this in.

2l + 2w = 60

In the question we are also told that the fence is 3 times as long as it is wide. This means that 1l = 3w. We can now subsitute l for 3w so that we only have one variable.

2(3w) + 2w = 60

Now we can simply use algebra to solve for w.

6w + 2w = 60

8w = 60

w = 7.5

Now that we know the value of w we can find the value of l since we know 1l = 3w.

l = 3w

l = 3(7.5)

l = 22.5

The length of the fence is 22.5ft and the width of the fence is 7.5ft.

The total number of electrons that can occupy the d-sublevel is 10.

So, option third is correct one.

learn about subshell,

https://brainly.com/question/19221869

#SPJ2

These are three questions each with its complete answer.

Question 1. Something must have mass in order to create change.

A. True

B. False

Answer:

Explanation:

Two counter examples will prove that the statement is false.

Neither light nor fire have mass, so they are not considered matter, but yet both can create changes.

Light is an electromagnetic wave, so it is energy, and as such it, of course, can cause some changes. One example are the chemical reactions, like photosynthesis, which require light to happen.

Ligth may also be described either as quanta named photons. Although photons behave like particles they do not have mass.

So, that example contradicts the statement that something must have mass in order to create change.

Fire also contradicts the statement. Fire is a manifestation of energy, it does not have mass, and sure you know how fire create changes in living and no living things.

Question 2. Powdered medicine fills a pill capsule. Which of the following is the best description of the state of the powder?

A. It is a solid because all powders are solid.

B. It is a gas because it takes up the entire volume of the pill capsule.

C. It is a liquid because it does not hold a definite shape.

Answer: the best description is the choice A:

Explanation:

Indeed, although sometimes the powder may be very fine (dust), yet it is not liquid or gas. Powders are always solid.

There are four main states of matter: solid, liquid, gas, and plasma.

Liquids are able to take the form of the container but do not occupy the entire container. Gases do occupy the entire container.

When powder is very fine it could resemble some properties of liquid, but the structure of powders is not crystaline, this is it is not an ordered arrangement. The structure of powders is an ordered arrangement, so powders are solids and not liquids.

It is easy to discard that a powdered medicine could be a gas, because it definetly do not occupy the entire volume of the pill capsule.

Question 3. Find an example of something that you do NOT know the state of. Describe it, and tell me your best guess of what state it is. Explain your guess.

Answer:

Two examples come to my mind:

Explanation:

I will use the example of Nutella to complete the answer.

Nutella is not a gas because when you open the jar it will not escape and fill the room around it.

When you put Nutella in a plate it will not flow over the whole plate, is it a solid ? But yet you can spread it easyly over a cookie. Is it a liquid?

So, Nutella behaves like a solid until you apply some force over it and then it seems a liquid.

I would guess that pastes are solids because they should have an inner structure that keep the particles together.

If you do some research you will find that pastes are neither liquid nor solids, they are named gels. And gels may be seen as a dispersion of molecules of a liquid within a solid, i.e. in liquid particles dispersed in the solid medium

This sure meets the requirements of this question.

To find the grams of Hydrogen in 1.52 grams of acetic acid, calculate the fraction of acetic acid's weight that is made up of Hydrogen (approximately 6.7%), then multiply this by the weight of the acetic acid. Thus, there would be approximately 0.102 grams of Hydrogen in 1.52 grams of acetic acid.

In order to determine the grams of Hydrogen in 1.52 grams of acetic acid, we first need to know the molecular weight of acetic acid (C2H4O2), which is about 60.05 g/mol. Acetic acid has 4 Hydrogen atoms. Each Hydrogen atom has an atomic weight of approximately 1.01 g/mol. Therefore, the total weight of Hydrogen in one molecule of acetic acid is 4.04 g/mol.

Next, we find the fraction of the weight of acetic acid that is made up of Hydrogen by dividing the total weight of Hydrogen by the molecular weight of acetic acid. So, 4.04 g/mol divided by 60.05 g/mol equals approximately 0.067 or 6.7%.

Finally, we multiply the weight of the acetic acid (1.52 grams) by the fraction that is Hydrogen (0.067). That's about 0.102 grams. Therefore, in 1.52 grams of acetic acid, there would be approximately 0.102 grams of Hydrogen.

https://brainly.com/question/32423379

#SPJ11

Answer: 2, 4

Explanation:

Carbon varies, so it can have either 2 or 4 electrons

Answer:

2, 4

Explanation:

Answer:

A thermometer is the appropiate tool to use.

Explanation:

! !

your answer is !

(A theromometer!)

Hope this helps

Answer: divide by 946.353

= 1.58 x 10^-4 or 0.000159

Explanation:

Answer:

The answer is SiO2

Explanation:

Silocon dioxide is written without a 1 after the silocon and with a 2 after the oxygen.

Answer: Acceleration of the ball in the given system is 5 meter per Second Square

The laws of motion are used to determine various aspects of an object in motion.

Explanation:

Applying the first law of motion to calculate acceleration; if formula used in first law is given as [tex]v=u+at[/tex]

Here we have a final velocity as 40 meter per second and initial velocity as 20 meter per second and time span is given as 2 second applying the given values in the given equation and finding the value of a

                            [tex]30=20+a \times 2 = a=5 m/s^2[/tex]

Answer:

Centripetal acceleration is 47 m/s²

Explanation:

It is given that,

Radius of the circle, r = 1.8 meters

The velocity of the ball, v = 9.2 m/s

We have to find the centripetal force of a ball on a string that is whirled horizontally over a boy’s head. It is given by :

So, the centripetal acceleration of the ball on a string is 47 m/s². Hence, the correct option is (E).                        

Answer:

1.62 × 10²⁴ atoms are in 52.3 g of lithium hypochlorite.

Explanation:

To find the amount of atoms that are in 52.3 g of lithium hypochlorite, we must first find the amount of moles. We do this by dividing by the molar mass of lithium hypochlorite.

52.3 g ÷ 58.4 g/mol = 0.896 mol

Next we must find the amount of formula units, we do this be multiplying by Avagadro's number.

0.896 mol × 6.02 × 10²³ = 5.39 × 10²³ f.u.

Now to get the amount of atoms we can multiply the amount of formula units by the amout of atoms in one formula unit.

5.39 × 10²³ f.u. × 3 atom/f.u. = 1.62 × 10²⁴ atoms

1.62 × 10²⁴ atoms are in 52.3 g of lithium hypochlorite.

There are 1.62 × 10²⁴ atoms in 52.3 g of lithium hypochlorite.

First, we will convert 52.3 g to moles using the molar mass of LiClO (58.4 g/mol).

[tex]52.3 g \times \frac{1 mol}{58.4 g} = 0.896 mol[/tex]

Then, we will convert 0.896 moles to molecules using Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.

[tex]0.896 mol \times \frac{6.02 \times 10^{23} molecule }{1 mol} = 5.39 \times 10^{23} molecule[/tex]

According to the chemical formula, there are 3 atoms in each molecule of  LiClO. The number of atoms in 5.39 × 10²³ molecules of LiClO is:

[tex]5.39 \times 10^{23} molecule \times \frac{3 atom}{1 molecule} = 1.62 \times 10^{24} atom[/tex]

There are 1.62 × 10²⁴ atoms in 52.3 g of lithium hypochlorite.

You can learn more about Avogadro's number here: https://brainly.com/question/13302703

An ion is formed when an atom gains or loses electrons.

Answer:

lose or gain electrons

1,000 times the base unit is kilo

1/1,000,000 of the unit base is micro

1/100 of the base unit is centi

1,000,000 times the base unit is mega

1/1,000 of the base unit is milli

1/1,000,000 of the base unit is nano

hope this helps :)

Answer:

Answer : A

Explanation:

O

A baseball flying tough the air at 90 miles per hour

Answer:

option B= anion (-1)

Explanation:

The halogens are present in the P- block of periodic table. There are thirty five elements present in p-block. The halogens are present in group seventeen. Their are seven electrons are present in valance sheet. All halogens require one electron to complete the octet and form anion carry -1 charge.

Halogens include following elements:

Fluorine, chlorine, bromine, iodine and astatine.

The halogens mostly form single bond with the other elements by gaining one electron and -1 charge. These are most reactive non-metals.

Properties of some halogen elements:

Fluorine:

1. It is yellow in color.

2. It is flammable gas.

3. It is highly corrosive.

4. Fluorine has pungent smell.

5. It's reactions with all other elements are vigorous except neon, oxygen, krypton and helium.  

Chlorine:

1. It is greenish-yellow irritating gas.

2. Its melting point is 172.2 K.

3. Its boiling point is 238.6 K.

4. It is disinfectant and can kill the bacteria.

5. It is also used in manufacturing of paper, paints and textile industries.

Iodine:

1. It is present in solid form.

2. It is crystalline in nature.

3. It is very corrosive and has pungent odor.

4. It can not react with oxygen and nitrogen.

Final answer:

2 x 10²² atoms of copper take up a volume of approximately 1.44 x 10²¹ cubic meters.

Explanation:

Copper atoms are incredibly small, and a single copper penny contains approximately 2 x 10²² copper atoms. To calculate how much space these atoms take up, we need to consider their mass and volume. The atomic mass of copper is 63.54 g/mol, and the density of copper is 8.80 x 10³ kg/m³. Using these values along with Avogadro's number (6.02 x 10²³ atoms/mol), we can calculate the volume occupied by 2 x 10²² atoms of copper.

First, we calculate the mass of 2 x 10²² atoms of copper:

Mass = Number of atoms x Atomic mass = 2 x 10²² x 63.54 g/mol = 1.27 x 10²⁴ g

Next, we use the density of copper to calculate the volume:

Volume = Mass / Density = 1.27 x 10²⁴ g / (8.80 x 10³ kg/m³ x 1000 g/kg) = 1.44 x 10²¹ m³

Therefore, 2 x 10²² atoms of copper take up a volume of approximately 1.44 x 10²¹ cubic meters.

Answer:

28.497 cm3

Explanation:

Formula

D=m/v

Given data:

density = 19.3g/cm3

mass = 550 g

Now we will put the values in formula:

V=m/d

V=550 g/ 19.3 g/cm3  = 28.497 cm3

So the volume of gold is 28.497 cm3.

Answer:

2

Explanation:

The change of state occurs at a constant temperture and pressure. In the grahp we can see while the time passes, the temperature doesn't change.

The rect number 4 correspond to a liquid-gas phase

Answer : The stage 2 shows the substance in both the solid phase and the liquid phase.

Explanation :

In the given phase diagram,

Stage 1 : It shows the solid state of a substance.

Stage 2 : It shows the melting and freezing process of a substance. It means that when the phase changes from solid state to liquid state at constant temperature is know as melting process and when the phase changes from liquid state to solid state at constant temperature is know as freezing process.

Stage 3 : It shows the liquid state of a substance.

Stage 4 : It shows the evaporation and condensation process of a substance. It means that when the phase changes from liquid state to gaseous state at constant temperature is know as evaporation process and when the phase changes from gaseous state to liquid state at constant temperature is know as condensation process.

Stage 5 : It shows the gaseous state of a substance.

Hence, from the above information we conclude that the stage 2 shows the substance in both the solid phase and the liquid phase.

Answer:

Herbivores

Members of the same species living in the same plac at the same time

Abiotic Factors

grasses → shrubs → softwood trees → hardwood trees

lichens → grass → shrubs → trees

the sustainability of ecosystems is decreasing regardless of protected areas.

an increase in the islanders' consumption of land and migratory birds, resulting in a decrease in the bird population

More access to renewable resources

Emigration

Can open or limit possibilities of future generations

Amount of food produced in an area

Clear Cutting

To create the soil

Endangered

Clumped

Explanation:

Answer:

As given below.

Explanation:

1. herbivores.

2. By all the types of organisms living in the same place.

3. Abiotic factors.

4. the hardwood trees to shrubs and softwood trees then to mosses.

5. From lichens to grass to shrubs and trees.

6. sustainability of the ecosystems is increasing more in protected areas.

7. the erosion of topsoil, leading to decreased crop production.

8. an increase in food supplies and better access to clean water.

9. emigration

10. will not limit any kind of possibilities for future generations.

11. It is the amount of land needed for a crop.

12. clearcutting

13. to create the soil.

14. threatened.

15. clumped

Answer:

Explanation:

The new product is a compound which is a product of combination of two reactants. This form of reaction is called Synthesis or combination. It involves the formation of compounds from the union of constituent elements in a reaction.

A compound is composed of two or more kinds of elements that are joined together in a definite grouping.

Answer:

Option C cooking oil is not heterogenous mixture

Explanation:

Mixture is a combination more than two substances and are not chemically combined.

It is of two types Homogenous mixture and heterogenous mixture

Homo means “same”.

Hetero means” different”

Homogenous mixture is a mixture which looks uniform throughout

Examples Cheese, salt solution, air, 18 carat gold

Heterogenous mixture is a mixture which looks non uniform throughout

.Examples Pizza, trail mix, salad, A mixture of oil and water

The maximum number of electrons that can occupy the third (n=3) shell is 18

Answer: Option E

Explanation:

Every shell can only have a certain number of electron: the first shell have up to 2 electrons, the second have up to 8 (2 + 6) electrons, up to eighteen electron for third shell like (2+6+10), etc. The formula to calculate is,

For nth shell, it can generally contain up to [tex]2 n^{2}[/tex] electrons.

We make use of the formula [tex]2 n^{2}[/tex] where “n” is the number of the shell, to find the number of electrons a shell occupies.

So, if n=3 then using the value in the formula, we have [tex]2 \times 3 \times 3=18[/tex] electrons . Hence, third shell holds up to 18 electrons.

The maximum number of electrons that can occupy the third (n=3) shell is 18. Option E is correct.

The maximum number of electrons that can occupy a given electron shell can be calculated using the formula [tex]2n^2,[/tex]where "n" is the principal quantum number of the shell. For the third shell (n=3), the maximum number of electrons would be:

[tex]2 * 3^2[/tex]= 18

The maximum number of electrons that can occupy the third (n=3) shell is 18

Therefore, Option E is correct.

Learn more about electrons here : brainly.com/question/26084288

#SPJ3

Answer:

V1= 0.305L

Explanation:

To find the initial volume of 1.25M potassium fluoride needed to make tge dilution specified in the question, we can use: C1 × V1 = C2 × V2

Since the question wants the volume in litres, convert 455 mL to L

455/ 1000

= 0.455 L

Now make the substitution

1.25 × V1 = 0.838 × 0.455

Rearrange to make V1 the subject

V1=

[tex] \frac{0.838 \times 0.455}{1.25 } = 0.305 [/tex]

Answer:

0.305

Explanation:

0.305

Answer:

3700 mL; 3700 cm³

Explanation:

1. Volume in millilitres

[tex]V =\text{3.70 L} \times \dfrac{\text{1000 mL}}{\text{1 L}} = \text{ 3700 mL}[/tex]

2. Volume in cubic centimetres

1 mL = 1 cm³, so

[tex]V = \text{3700 mL} \times \dfrac{1\text{ cm}^{3}}{\text{1 mL}} = \text{3700 cm}^{3}[/tex]

The volume of the liquid in mL is 3700mL and in cm3 is 3700 cm3.

First, to change the unit of a value from liters to milliliters, it is necessary to follow the following relationship:

                                           [tex]1 L = 1000mL[/tex]

Thus, the calculation can be performed:

                                           [tex]3.70L \times 1000 = 3700 mL[/tex]

Finally, to change the unit from mL to cm3 we have:

                                           [tex]1 cm^{3} = 1 mL[/tex]

                                         [tex]3700 mL \times 1 = 3700 cm^{3}[/tex]

So, the volume of the liquid in mL is 3700mL and in cm3 is 3700 cm3.

Learn more about measurement transformation in: brainly.com/question/10667910

Answer:

The option which best describes the riders is :

Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating

Explanation:

Franklin is not accelerating as the final velocity (50 km/h) is equal to the initial velocity (50 km/h) , rather he is moving at a constant speed.

Acceleration = (final velocity - initial velocity) / (final time - initial time)

According to acceleration formula given above , the rate at which Gabriella is slowing down is 2.3 km/h and the rate at which Kendall is speeding up is also 2.3 km/h.

Hence the option stating "Gabriella is is slowing down at the same rate that Kendall is speeding up and Franklin is not accelerating"  is true and it best describes the riders.

Answer: B.

B. Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating.

Answer:

From the arrangement of electrons

Explanation:

The atomic numbers of the elements in the various groups differ because they contain different numbers of protons.

Atomic number of an element is the number of protons in that element and it is a property that is used to distinguish one element from another.

Elements are substances that contains atoms which cannot be broken down further into any smaller substances.

Periodic table is a structured table that arranged these elements according to the number of atoms they contain in their shells.

In a periodic table, these elements appear in periods and in groups.

The groups contain elements that share the same number of atoms in their outermost shell.

Therefore, group 1, 2, 13 and 18 contain elements that vary because they contain different numbers of protons.

Learn more here:

https://brainly.com/question/24674837

Answer:

what are stars made of?

Explanation:

that's what google says