An atom of element Be has four protons, four electrons, and five neutrons.
Which element below could be an isotope of this atom?

Explanation:

An atom is the smallest indivisible particle of any substance that takes part in a chemical reaction.

All atoms are identified by the number of protons in them. Protons are the positively charged particles in an atom.

Therefore, atoms and ions are similar because the atom and ion of an element have the same number of protons but differs in the number of electrons they carry.

Answer:

0.206 mol H₂O₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

7.00 moles H₂O₂

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O₂ - 2(1.01) + 2(16.00) = 34.02 g/mol

Step 3: Convert

[tex]7.00 \ g \ H_2O_2(\frac{1 \ mol \ H_2O_2}{34.02 \ g \ H_2O_2} )[/tex] = 0.205761 mol H₂O₂

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

0.205761 mol H₂O₂ ≈ 0.206 mol H₂O₂

Answer:

238.14

Explanation:

2 H + 2O

2(1.01) + 2(16.00) = 34.02

34.02*7 = 238.14

238.14

Answer:

Number of moles = 2.72 mol

Explanation:

Given data:

Number of moles of H₃PO₄ present = ?

Molarity of solution = 18.1 M

Volume of solution = 150.0 mL (150/1000 = 0.15 L)

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

By putting values,

18.1 M = number of moles / 0.15 L

Number of miles = 18.1 M × 0.15 L

Number of moles = 2.72 mol

Answer:

ice.

Explanation:

it becomes a liquid

Answer:

They repel due to a force of repulsion

Answer:

Base

Explanation:

Answer:

C

Explanation:

It just is, if you look online and conduct research you will see that compounds look just like number 3. It cannot be A or B.

Answer:

8 Valence Electrons

Explanation:

Answer:

the answer is j

Explanation:

Answer:

J. All of the above

Explanation:

Since the sun is tilted on it's axis, then the rays of the sun fall on the equator, directly, and that causes it to heat the equator more than the other regions.

Sometimes the sun's rays are on two tropics, Cancer and Capricorn, and that causes the Earth to heat unevenly, which causes wind and ocean currents to form.

Answer:

deep ............................

Answer:

( A Heart) fragile clueless of what love is then one day... somebody comes, somebody comes and you get a feeling a feeling of happiness a feeling of pure love not like any crush! Then one day... you lose them, you lose them and they are gone at first you feel cold like a piece of you just left the person that mad you feel this joy! You were just having another normal day but then you met then after that day you were happy but that one person! That one person made you So happy if you lost them you cant imagine how you could go what was life Before. so the second they leave it feels like your heart lost a piece that could only be filled with love! over the days your'e heart starts to feel numb and feel so lost you wonder and wonder. ( The heart)

Explanation

Answer:

Every map is a representation of reality, thus a model in the broadest sense. Sometimes mapping is distinguished from modelling by stating that mapping is a simple representation of reality, while modelling is trying to cover more complexity in reality.

Explanation:

Answer:

C

Explanation:

Hope this helps Mrs. or Sir

Answer:

Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material.

Because particles within a solid are fixed in place, convection currents are seen only in gases and liquids. A temperature difference leads to an energy transfer from an area of higher energy to one of lower energy.

Answer:

Mass of CO₂ produced  = 5.72 g

Explanation:

Given data:

Mass of methane = 2.34 g

Mass of oxygen = 8.32 g

Mass of CO₂ produced = ?

Solution:

Chemical equation:

CH₄ + 2O₂    →      CO₂ + 2H₂O

Number of moles of methane:

Number of moles = mass/molar mass

Number of moles =  2.34 g/ 16 g/mol

Number of moles = 0.146 mol

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles =  8.32 g/ 32 g/mol

Number of moles = 0.26 mol

Now we will compare the moles of carbon dioxide with oxygen and methane.

                         CH₄             :              CO₂

                           1                 :              1

                        0.146            :           0.146

                         O₂                :               CO₂

                          2                 :                   1

                     0.26                :              1/2×0.26 = 0.13 mol

Less number of moles of CO₂ are produced by oxygen thus oxygen will react as limiting reactant.

Mass of CO₂:

Mass = number of moles × molar mass

Mass = 0.13 mol ×  44 g/mol

Mass = 5.72 g

Moles of Oxygen produced : 4.5 moles

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

The reaction coefficient shows the mole ratio of the reactants and products

Reaction

2KCIO₃ → 2KCl + 30₂

moles of KCIO₃ = 3

From equation, mol ratio of KCIO₃ : O₂ = 2 : 3, so mol O₂ :

[tex]\tt mol~O_2=\dfrac{3}{2}\times 3=4.5[/tex]

Answer:Twice a day, every day of the year, weather balloons are released simultaneously from almost 900 locations worldwide! This includes 92 released by the National Weather Service in the US and its territories. The balloon flights last for around 2 hours, can drift as far as 125 miles away, and rise up to over 100,000 ft.

Explanation:

Answer:

319

Explanation:

The molecular mass of C3H18 can be found by adding up the molecular weights of carbon and hydrogen so, (12.01 x 3) For Carbon and (1.008x18) for hydrogen. You will find it is 54.174g/mol.

To find grams muliply g/mol by mols so 5.9 x 54.174= 319 i didnt see any errors with my math so maybe you clicked 8 by accident but i may just be wrong

Answer:

0.553 J/g°C

Explanation:

From the question given above, the following data were obtained:

Heat (Q) required = 99.7 J

Mass (M) = 34.7 g

Temperature change (ΔT) = 5.20 °C

Specific heat capacity (C) =?

Thus, we can obtain the specific heat capacity of titanium as follow:

Q = MCΔT

99.7 = 34.7 × C × 5.20

99.7 = 180.44 × C

Divide both side by 180.44

C = 99.7 / 180.44

C = 0.553 J/g°C

Therefore, the specific heat capacity of titanium is 0.553 J/g°C.

Answer:

i think its  Hydrogen gas and oxygen gas react explosively to form water. and . Methane burns in air that contains oxygen.

Explanation: Mine was a little bit different than yours please forgive me if I'm wrong I chose answers that was similar to mine

Methane burns in air that contains oxygen and Hydrogen gas and oxygen gas react explosively to form water. These  two reactions are faster than the others.

Chemically speaking, methane has the formula CH4. The simplest alkane and the primary component of natural gas, it is a group-14 hydride. The amount of oxygen breathed from the air might be decreased by high methane levels. This may include headaches, facial flushes, slurred speech.

Unscented, colorless, and combustible, methane is a gas. It is mostly used as fuel to produce heat and light. It is also employed in the production of organic compounds. Methane is frequently found in landfills, marshes, septic tanks, sewers, and other places where natural materials decompose.

Suffocation can result from high methane concentrations in enclosed spaces because methane reduces the amount of oxygen in the air. Lack of oxygen can cause headaches, nausea, lightheadedness, and unconsciousness.

Thus, option A and D are correct.

To learn more about methane, follow the link;

https://brainly.com/question/2127750

#SPJ5

Answer:

biosphere

Explanation:

Living things need water (hydrosphere), chemicals from the atmosphere, and nutrients gained by eating things in the biosphere.

Answer:

No

Explanation:

If Teresa has a $100 Gift Card and her lunch is $8.50 everyday, $8.50 x 10 = 10 Lunchs for a total of $85 then add one more which = 11 Lunchs for a total of 93.50, this means she can not buy another lunch, Colin has a $75 gift card and his lunch is $6 everyday, so $6 x 10 = $60 for a total of 10 lunchs plus add 2 which is 12 lunchs for a total of $72 which means No Teresa's Gift Card Will Not Be Greater In Lunchs.

Answer:

Explanation:

1. To identify what's been oxidised and what's been reduced in a redox reaction

2. In naming compounds

3. To work out reacting proportions in titration reactions

Covalent bond is a type of chemical bond which is due to the sharing an electron from each and every atom that is participating in the bond.

Ionic bond is a type of bond which is formed due to the complete donation of an electron from one atom to another.

Ionic bond is formed between metals and non-metals. The group which provide the Metal are IA and IIA i.e. S block elements. The group which mostly provide non-metal is VII A i.e. halogens. The Metals give up their ONLY Valance shell electron which is accepted by the Non-metal. This results in formation of ions, The Metals gets the positive charge thus called cation and The non-metal gets a negative charge thus called anion. These Positive and Negative ion attract each other resulting in the formation of IONIC BOND.

The Ionic bond is formed between The metal and non metal because, the metals have low ionization energy due to which the valence shell is ejected out easily, and The Non-Metals have high electron affinity which means that  they attract an electron with greater force because they need one electron to complete their octet. As the non metal has high electron affinity and metal have low electron affinity thus the electronegativity difference between the non metal and metal is more than 2 thus they make ionic bond.

Electronegativity is the tendency of an atom to attract shared pair of electron. If there is electronegativity difference between the two atom more than 2 then it makes IONIC BOND. If the electronegativity difference is less than 2, it makes COVALENT BOND.

The question says, the KCl has ionic bond but HCl has covalent bond, why?

Answer is that KCl has electronegativity difference between K and Cl atom more than 2 thus it forms ionic bond. H and Cl has electronegativity difference of less than 2 thus it makes Covalent Bond. K donates its valence electron completely to the Chlorine atom because chlorine has much more electronegativity than potassium(K). H shares an electron with chlorine, it is not completely donated. H has pair of electron for sometime and chlorine has pair of electron for sometime, It is because the Chlorine and Hydrogen has less difference of electronegativity so they attract with almost same electronegativity.