This unknown element could most likely be a part of which of the following
familles?
A Alkall metals
B Alkaline earth metals
C Halogens
D Noble Gases

Explanation:

Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. When an equal number of atoms of an element is present on both sides of a chemical equation, the equation is balanced.

Answer:

there it is fella tried on ma own consciousness

Answer:

103.98 kpa

Explanation:

Pv= nRT

Where

P= pressure of the system=

n= number of moles= 3 moles

T= temperature= 250 K

Volume of the container= 60 liters

R= 0.0821L.atm/K.mol

Substitute the values

Pv= nRT

P= nRT/ V

= (3×0.0821×250)/60

= 1.026 Atm

1atm= 101325 Pascal

1.026 atm= X

= 103984 pasca

Convert to kilopascal

= 103984 pasca /1000

= 103.98 kpascal

Answer:climate change

Explanation:

Answer:

one piece and jujutsu kaisen

Explanation:

what your favorite?

Answer:

aot, noragami, yuukoku no moriarty and promise never land only season 1 tho

The big bang is characterized by an expanding universe.

The scientists hold the theory that the universe is the result of a massive explosion that marked the beginning of the universe. Since the big bang, matter has been spreading.

Hence, one thing that has become associated with the big bang is the idea of an expanding universe.

Learn more about the universe:https://brainly.com/question/9724831

Answer:

In Alpha Decay the nucleus is split into 2 parts with one of these parts – the alpha particle – zooming off into space. The nucleus has its atomic number reduced by 2 and its mass number is reduced by 4 (2 protons and 2 neutrons are removed). In Beta Decay (minus) a neutron turns into a proton.

Explanation:

Answer:

The carbon returns to the atmosphere as carbon dioxide. Cars, factories, and power plants rely on these fossil fuels to operate. In the year 2000, vehicles were the source of one-third of all carbon dioxide emitted in the United States.

Explanation:

Answer:

16

Explanation:

Metals in group 2 form ions of the sort M^2+. If they must form ionic compounds of general formula MX, then the non metal (X) must have a valency of 2 and form the ion X^2-.

Among the options listed, only elements of group 16 form ions of the sort  X^2-, hence they are able to form compounds of general formula MX with group 2 cations. Examples of such compounds include; CaS, MgS etc

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The Balanced Chemical Equation for above reaction is :

[tex] \small \mathrm{Cu(OH)_2+ 2HCI\rightarrow CuCl _ 2 + 2H2O}[/tex]

_____________________________

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Explanation:

Answer:

15.06 L

Explanation:

Using the ideal gas law equation:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

According to the information provided in this question,

P = 3.50 atm

n = 1.9 moles

V = ?

T = 65°C = 65 + 273 = 338K

Using PV = nRT

V = nRT/P

V = (1.9 × 0.0821 × 338) ÷ (3.5)

V = 52.725 ÷ 3.5

V = 15.06 L

Answer: 4.999 moles of excess reactant will be left over.

Explanation:

Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.

Excess reagent is defined as the reagent which is left behind after the completion of the reaction.

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]       .....(1)

Given mass of aluminium carbide = 112 g

Molar mass of aluminium carbide = 143.96 g/mol

Putting values in equation 1:

[tex]\text{Moles of aluminium carbide}=\frac{112g}{143.96g/mol}=0.778mol[/tex]

For the given chemical reaction:

[tex]2Al_4C_3(s)+12H_2O(l)\rightarrow 3CH_4(g)+4Al(OH)_3(s)[/tex]

By the stoichiometry of the reaction:

2 moles of aluminium carbide reacts with 12 moles of water

So, 0.778 moles of aluminium carbide will react with = [tex]\frac{12}{2}\times 0.778=4.668 mol[/tex] of water

Given mass of water = 174 g

Molar mass of water = 18 g/mol

Putting values in equation 1:

[tex]\text{Moles of water}=\frac{174g}{18g/mol}=9.667mol[/tex]

Moles of excess reactant (water) left = 9.667 - 4.668 = 4.999 moles

Hence, 4.999 moles of excess reactant will be left over.

What is genetic modification (GM) of crops and how is it done? GM is a technology that involves inserting DNA into the genome of an organism. To produce a GM plant, new DNA is transferred into plant cells. Usually, the cells are then grown in tissue culture where they develop into plants.

Answer:

GM is a technology that involves inserting DNA into the genome of an organism. To produce a GM plant, new DNA is transferred into plant cells. Usually, the cells are then grown in tissue culture where they develop into plants. The seeds produced by these plants will inherit the new DNA.

Answer:

Cell Wall, Cell Membrane, Nucleus, Endoplasmic Reticulum (ER), and Ribosome.

Explanation:

Hopefully this helps :).

Answer:

the nucleus the largest organelle in eukaryotic cells is surrounded by the cells

Explanation:

dolly was cloned I guess

Answer:

Royal jelly is a honey bee secretion that is used in the nutrition of larvae and adult queens.

Nuptial flight: a flight of sexually mature social insects (as bees) in which mating takes place and which is usually a prelude to the forming of a new colony; especially : the mass flight and mating of winged sexual forms of ants after leaving the parent nest.

Cocoon: a silky case spun by the larvae of many insects for protection in the pupal stage.

Group B:

Not sure) a- Keep in cold places because when there are changes in weather, it could help the silkworm come out faster.

b-They live together in a large, well organized group and bees engage in complex activities that required works from other community members in the bee society.

c- i dont know this part sorry =(

d-The larvae of a silk moth secrete the silk thread which is used to make clothes. Honey bees produce and store honey which is nutritious food. Silkworm is a creamy white colored insect which is about 2-3 cm long and shining in nature Bee larvae have been shown to be an excellent food source for rearing insects

Explanation:

Answer:

For group A

Explanation:

1. A royal jelly is a substance that is secreted by the worker honeybee's. This is fed to a potential queen bee to help them grow.

2. The nupital flight is part of reproduction for ants, termites, and most bee species.

3. A cocoon is used for the resting pupal stage in the life cycle of animals like butterflies and moths. It is a protective covering and is silky.

4. They feed on mulberry leaves.

Answer:

-191.7°C

Explanation:

P . V = n . R . T

That's the Ideal Gases Law. It can be useful to solve the question.

We replace data:

2.5 atm . 8 L = 3 mol . 0.082 L.atm/mol.K . T°

(2.5 atm . 8 L) / (3 mol . 0.082 L.atm/mol.K) = T°

T° = 81.3 K

We convert T° from K to C°

81.3K - 273 = -191.7°C

Answer:

The temperature is 81.3 K.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.

In this case:

Replacing:

2.5 atm* 8 L= 3 moles* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] *T

Solving:

[tex]T=\frac{2.5 atm* 8 L}{3 moles* 0.082\frac{atm*L}{mol*K}}[/tex]

T= 81.3 K

The temperature is 81.3 K.

Answer:

See explanation

Explanation:

Let us consider the two compounds carefully. Carbon dioxide is purely a non-polar molecular compound while the bond between the C2^2- ion and Ca^2+ is ionic thereby making CaC2 an ionic compound.

Recall that ionic compounds have high melting and boiling points due to strong ionic interactions in the structure of the compound.

On the other hand, CO2 is a non-polar substance whose molecules are held together only by weak dispersion forces.

As a result of the reasons outlined above, carbon dioxide has a low boiling point and calcium carbide has a high boiling point.

Answer:

In thes structure of PO43- there are a total of 32 valence electrons. For the structure for PO4 3- you should take formal charges into account to find the best  structure for the molecule. Remember, PO4 3- has a negative three charge on the molecule.

Explanation:

Answer:

5/8 M

Explanation:

NaOH + HCl ====> NaCl + H2O

in 25 mL of 0.5M acid, we have 1/80 Mol of HCl

it mean we must have 1/80 Mol of NaOH.

20 mL = 1/50 L

(1/80)Mol / (1/50)L = 5/8 M