Draw the Lewis structure for the compound beryllium nitride, with chemical formula Be3N2

Answer:

Magnesium has valency equal to 2 +

Explanation:

because the electronic configuration of Mg is [2,8,2]. The nearest noble gas to magnesium is neon with electronic configuration of [2,8], to achieve this stable electronic configuration Mg can lose 2 valence electrons, hence its valency is 2 + .

Answer:

Number of moles = 0.51 mol

Explanation:

Given data:

Mass of CO₂ = 22.4 g

Number of moles = ?

Solution:

Number of moles of CO₂:

Number of moles = mass/molar mass

Molar mass of CO₂ = 44 g/mol

by putting values,

Number of moles = 22.4 g/ 44 g/mol

Number of moles = 0.51 mol

The specific heat of the substance  : c = 0.235 J/g  °C

Given

Heat absorbed by substance = 419.7 J

m = mass = 23.5 g

Δt = Temperature difference : 76 °C

Required

The specific heat

Solution

Heat can be formulated

Q = m.c.Δt

Input the value :

419.7 = 23.5 x c x 76

c = 419.7 : (23.5 x 76)

c = 0.235 J/g  °C

Answer:

a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.

Explanation:

The empirical formula and the molecular formula are the same : C₁₇H₁₉NO₃

Given

3.22 g of carbon, 0.300 g of hydrogen, 0.221 g of nitrogen, and the rest is oxygen.

Required

The empirical formula and then the molecular formula.

Solution

Mass of Oxygen = 4.5 - (3.22+0.3+0.221)=0.759 g

Mol ratio of elements C : H : N : O =

3.22/12 : 0.3/1 : 0.221/14 : 0.759/16 = 0.268 : 0.3 : 0.016 : 0.047

Divide by 0.016 :

16.75 : 18.75 : 1 : 2.9375 = 17 : 19 : 1 : 3

(C₁₇H₁₉NO₃)n = 285

(12.17+19+14+3.16)n = 285

(285)n = 285

n = 1

Then the empirical formula and the molecular formula are the same

Answer:

p=5.0g/cm³

Explanation:

density formula

p=m/v

And if im not mistaken the stone weighs 200grams

The Volume of the tube increases by 40

So

p=200/40

p=5.0g/cm³

Answer:

Covalent bonds

Explanation:

Answer:

Covalent bonds

Explanation:

Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms.

Hope this helps :)

Answer:

an ion is an element that carries either positive or negative charge. the example are cation which has a positive charge e.g H+ and anion which had a negative charge eg Cl-.

Answer:

Thermal conductivity (often denoted by k, λ, or κ) refers to the intrinsic ability of a material to transfer or conduct heat.

Thermal conductivity is the ability to transfer heat.

Thermal conductivity is the measure of the capacity of a material to conduct heat. Materials with high thermal conductivity can transmit heat quickly, while materials with low thermal conductivity will transmit heat slowly or resist its movement altogether. Heat transfer is the movement of heat from one object or substance to another because of a difference in temperature. Heat can move by conduction, convection, and radiation.

The rate at which heat is transferred through a unit cross-section area of a material by conduction when a temperature gradient exits perpendicular to the area is known as thermal conductivity.

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Answer:

Ok 15 miles NO2 you need the salt and pepper trick so mix it add water sit in it when you get cold write down uh temperature then you need to get out or it may kill you when it starts to get cold then go to the y- axis then you need to ask your teacher for help after you do the y-axis

Answer:

salt water heterogeneous mixture , pure substance compound,element solut8on

Answer:

made to fit a specific function

Answer:

10 hours

Explanation:

Answer:

10

Explanation:

The type of wave is shown in the image is transverse wave and the correct option is option B.

A transverse wave is a wave in which particles of the medium vibrate at right angles, or perpendicular, to the direction that the wave travels.

Transverse waves commonly occur in elastic solids, oscillations, in this case, are the displacement of solid particles from their relaxed position, in the direction perpendicular to the propagation of the wave.

Transverse waves can travel through empty space as electromagnetic waves or be mechanical waves.

Therefore, The type of wave is shown in the image is transverse wave and the correct option is option B.

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Answer:

it is a replacement reaction

Answer:

I believe it is Spruce, because of the shape of the leaves

Answer:

Explanation:

Spruce

Answer:

Metamorphic rocks can also be formed in ocean floors.

Explanation:

The ocean floor is made up predominantly of basalts and are derived by the cooling an solidification of magma in this environment.

Answer: a is incorct

Explanation:

Answer: a) copy tissue

Explanation:

Tissue and cells in general get damaged, or just break down from wear and tear. So the cells divide to make up for this shortcoming, effectively replacing any broken parts with fresh new ones.

Answer:9%

Explanation:

When the tin atom is excited, then the tin atom absorbs energy. As a result, an electron in the 5s orbital jumps to the 5pz orbital.

The electron configuration exists in the distribution of electrons of an atom or molecule in atomic or molecular orbitals.

When the tin atom is excited, then the tin atom absorbs energy. As a result, an electron in the 5s orbital jumps to the 5pz orbital.

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Answer:

Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid).

Explanation:

Your welcome

Answer:

Antioxidants such as vitamin C are preservatives by inhibiting the degradation of food by oxygen. Bulking agents such as starch are additives that increase the bulk of a food without affecting its taste.

Answer:

2.8J

Explanation:

Given parameters:

Specific heat capacity  = 0.129J/g°C

Mass  = 0.7g

Initial temperature  = 53°C

Final temperature  = 22°C

Unknown:

Quantity of heat released  = ?

Solution:

To solve this problem, we use the expression below;

       H  = m c Ф

 H is the quantity of heat released

m is the mass

 c is the specific heat capacity

  Ф is the change in temperature

Now,

  Insert the given parameters and solve;

  H  = 0.7 x 0.129 x (22  - 53)  = -2.8J

The amount of heat released is 2.8J, the negative depicts the heat released.

Answer:

Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus. Because opposite electric charges attract each other, negative electrons are attracted to the positive nucleus