umm explanation pls so i answee
The fact that atoms and molecules are always in motion helps scientists explain how solids turn into liquids. What is this explanation an example of? A.
a hypothesis
B.
an observation
C.
a scientific law
D.
a scientific theory
Sulfur has an electronegativity of 2.58, while Cesium has a value of 0.79. Based on this information, they would have what kind of chemical bond?
Answer:
Ionic
Explanation:
Because sulphur is a non-metal and cesium is part of the group 1 Alkali Metals, this creates an ionic bond
Ionic bonds are created from one metal and one non-metal element.
This still is declared as Ionic despite the balance of this is Cs2S
the earth is 24,901 miles. how many hours would it take to travel around the earth if traveling 100 meters per second?
Answer:
24,901 x 1609.34 = 40074275
40074275/100 equals
400742.75 s
divided by 3600
111.31
Explanation:
How many grams of water (H2O) are produced from 34 grams of oxygen (O2)? *
Answer:
Explanation:
complete combustion reaction of ethane is given by the reaction
2C2H6+7O2..............4CO2+6H2O
no of moles in 34 grams of O2=34/32=1.063
7mole of O2 produced 6 moles of H2O
therefore 1.063 moles of O2 produced=1.063*6/7=0.9 moles
now 0.9 moles of H2O contain how much grams=0.9*18=16.2 grams
Which element is the most similar to calcium ca
Answer:
strontium
Explanation:
Answer:
Strontium
Explanation:
This is a earth metal, calcium is a reactive metal that forms a dark oxide nitride layer when exposed to air.
Regional Metamorphism occurs when great masses of rock are exposed to pressure. What does this typically form?
Answer:
Gneiss forms by regional metamorphism from both high temperature and pressure. Quartzite and marble are the most commonly used metamorphic rocks.
How did the instrument in the picture help to disprove part of Dalton's atomic model?
A)
It showed all matter is made of atoms and that atoms are indivisible and
indestructible.
B)
It showed that all atoms of a particular element are not identical.
C)
It showed that compounds are formed by a combination of two or more
different kinds of atoms.
D)
It showed that a chemical reaction is a rearrangement of atoms.
No
Answer:
It’s b;)
Explanation:
Answer:
B is correct
Explanation:
Write the net ionic equation for the reaction that occurs when equal volumes of 0.080 M aqueous acetic acid and sodium nitrite are mixed. It is not necessary to include states such as (aq) or (s).
Answer:
CH₃COO⁻ + NaNO₂ → CH₃COONa + NO₂⁻
Explanation:
When equal volumes of 0.080 M aqueous acetic acid and sodium nitrite are mixed (1:1), we have:
Acetic acid = CH₃COOH
Sodium nitrite = NaNO₂
The molecular equation is:
CH₃COOH(aq) + NaNO₂(s) → CH₃COONa(s) + HNO₂(aq)
The ionic equation is:
CH₃COO⁻H⁺ + Na⁺NO₂⁻ → CH₃COO⁻Na⁺ + H⁺NO₂⁻
The net ionic equation is:
CH₃COO⁻ + NaNO₂ → CH₃COONa + NO₂⁻
I hope it helps you!
List the pros and cons of combustion.
Answer:
burny stuff
Explanation:
Answer:
Explanation:
Majority of fuels are comprised of hydrocarbons or compounds that contain carbon and hydrogen atoms. In a perfect setting, oxygen is supposed to convert all the hydrogen to water while the carbon is transformed to carbon dioxide.
Unfortunately, achieving a perfect combustion process is near impossible in reality. Fuels burn when they react with the amount of oxygen in the air. With insufficient air, the combustion doesn’t push through normally and ends up as an incomplete or partial combustion. Instead of just carbon dioxide, water, and nitrogen, an impartial combustion process produces harmful byproducts like partially burned hydrocarbons (VOCs) and Nitrogen oxides. A loss in fuel economy also occurs because not all of the fuel is properly processed to produce energy.
Of the following, which element has the highest first ionization energy?
Li
Cs
At
F
how many moles are present in 10.0g aspartame
Answer:
Here is the answer:
Explanation:
What is the zonecreated if force of separation occurs?
9. What are the advantages of using an indicator to inform pH measurements? What are the advantages of using a pH meter?
Answer:
The advantages of using an indicator to inform pH measurements:
It gives a mathematically result of the pH, in addition, it gives the precise pH of solvent, and it also gives an idea of the straight of the solution also.
Now, the advantage of using a pH meter:
It is a rapid method to characterize between acids, bases. However, this method does not show how strong acid or base actually are, plus it tends to gives a range of acidity or basicity not quite accurate as a result.
Who can do my chemistry? It's due tonight, please! It’s about solubility interactive
Answer:
I can, i love chemistry
Explanation:
Is this an example of decomposition
2CH4 + 402 → 2C02 + 4H2O
Answer:
Identify each equation as a composition reaction, a decomposition reaction, or neither.
Fe2O3 + 3 SO3 → Fe2(SO4)3
NaCl + AgNO3 → AgCl + NaNO3
(NH4)2Cr2O7 → Cr2O3 + 4 H2O + N2
Solution
In this equation, two substances combine to make a single substance. This is a composition reaction.
Two different substances react to make two new substances. This does not fit the definition of either a composition reaction or a decomposition reaction, so it is neither. In fact, you may recognize this as a double-replacement reaction.
A single substance reacts to make multiple substances. This is a decomposition reaction.
Test Yourself
Identify the equation as a composition reaction, a decomposition reaction, or neither.
C3H8 → C3H4 + 2 H2
Explanation:
I hope I help :)))
Bromine gas in a container is heated over a flame. What happens to the average kinetic energy of the bromine particles? It decreases rapidly. It increases quickly. It remains the same. It decreases slowly.
Answer: B. It increases quickly
Explanation:
As the bromine gas in a container is heated over a flame, the average kinetic energy increases quickly.
Kinetic energy of gas moleculeThe temperature of gas molecules is the measure of average kinetic energy of the gas molecules.
The increase in temperature increases the heat gained by the gas molecules which in turn increases the average kinetic energy of the individual gas molecules.
Thus, as the bromine gas in a container is heated over a flame, the average kinetic energy increases quickly.
Learn more about average kinetic energy of gases here: https://brainly.com/question/952575
How many molecules are there in .0023kg of NH4SO2?
Answer:
Molar mass of NH4SO2=104gmol`
No of moles of NH4SO2=2.3g/104gmol`=0.022×(avagadro's constant)
Which is an example of a effect of geotropism
Answer:
An example of geotropism is the movement of nutrients. minerals and water in a plant. This transport is accomplished by specialized parts of the plant, the xylem which is pronounced zylem and the phloem which is pronounced flowem are the straw like parts of a plant’s stem that move the stuff up and down.
Explanation:
If the pressure on 36.0 mL of a gas at STP is changed to a pressure of 35.3 kPa at constant temperature, the new volume of the gas is:
The new volume of the gas : 103.334 ml
Further explanationBoyle's Law
At a constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
1 kPa = 0,00986923 atm
35.3 kPa = 0,3483839 atm
at STP ( 0°C, 1 atm) with volume 36 ml changed to 35.3 kPa :
P₁=1 atm
V₁=36 ml
P₂= 0,3483839 atm
The new volume(V₂) :
[tex]\tt V_2=\dfrac{P_1.V_1}{P_2}\\\\V_2=\dfrac{1\times 36}{0,3483839}=103.334~ml[/tex]
what is normality and molarity of the concentration of solution?
Answer:
Normality is the number of gram equivalents of solute divided by the volume in liters.
The molarity is the amount of moles in solute divided by the volume in liters.
Moles are the molar mass times grams if you're curious
I hope this helps and good luck!
Answer:
Molarity and normality describe the numbers (moles) of reactants or products dissolved in one liter of solution. Molarity: M = moles of solute contained in one liter of solution. ... Normality is always a multiple of molarity. It describes the “equivalent” moles of reactants involved in chemical reactions.
Explanation:
Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Gram equivalent weight is the measure of the reactive capacity of a molecule. The solute's role in the reaction determines the solution's normality. Normality is also known as the equivalent concentration of a solution.
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
Formula for Molar: M = [tex]\frac{n}{v}[/tex]
How many electrons are in the nucleus of an atom with an atomic number of
16?
O None. Electrons are not in the nucleus
08
O 16
O 32
Answer:
None. Electrons are not in the nucleus.
Explanation:
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral .
The atom having atomic number 16 have 16 electrons and these electrons are present out side the nucleus.
Q2 A solution has a (OH-) = 4.0x10^-5 M. What are the [H30+) and the pH of the
solution?
Answer:
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
pH = 9.6
Explanation:
Step 1: Given data
Concentration of OH⁻ in the solution ([OH⁻]): 4.0 × 10⁻⁵ M
Step 2: Calculate the concentration of H₃O⁺ in the solution
Let's consider the self-ionization of water.
2 H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)
The ion-product of water (Kw) is:
Kw = 1.0 × 10⁻¹⁴ = [H₃O⁺] × [OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/[OH⁻]
[H₃O⁺] = 1.0 × 10⁻¹⁴/4.0 × 10⁻⁵
[H₃O⁺] = 2.5 × 10⁻¹⁰ M
Step 3: Calculate the pH of the solution
We will use the following expression.
pH = -log [H₃O⁺]
pH = -log 2.5 × 10⁻¹⁰
pH = 9.6
Taking into account the definition of pH and pOH, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
First of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
The following relationship can be established between pH and pOH:
pH + pOH= 14
In this case, you know that [OH⁻]= 4×10⁻⁵ M. For this concentration, the pOH is calculated as:
pOH= - log (4×10⁻⁵ M)
pOH= 4.398
Then, pH can be calculated as:
pH + 4.398= 14
pH= 14 - 4.398
pH= 9.602
So, the [H₃O⁺] is calculated as:
9.602= - log [H₃O⁺]
[H₃O⁺]= 10⁻⁹ ⁶⁰²
[H₃O⁺]= 2.5×10⁻¹⁰ M
Finally, the pH and [H₃O⁺] of the solution is 9.602 and 2.5×10⁻¹⁰ M respectively.
Learn more:
brainly.com/question/13557815?referrer=searchResultsWhat is the pH value of distilled water?
Answer:
7
Explanation:
can someone help. posted this same question 3-4 times.
Alina wants to make some yummy sugar cookies. The recipe written in her book is: 2 3/4 cup flour + 1 cup butter + 1 1/2 cup sugar + 1 egg + 1 tsp baking soda + 1/2 tsp baking powder = 24 cookies But Alina has the following ingredients in her kitchen: 9 cups flour, 5 cups butter, 4.5 cups sugar, 8 eggs and a excess of baking soda and powder. 1. How many cookies can she make? 2. Which ingredient is her limiting reactant? 3. Besides, baking soda and powder, how many of each reactant will be left over in her kitchen?
(JSYK: this is all considering that only whole batches are included and fractional batches aren't)
Answer: 3 batches (72 cookies), her limiting reactant should be sugar since she only has enough to make three batches exactly, and she will also have 3/4 a cup of flour left over, 2 cups butter, and 5 eggs, in addition to the excess of baking soda and baking powder.
Hope this helps, if not, comment below please!!!
What are valence electrons? How would you determine the valence electrons of Oxygen?
Answer:
Valence electrons are the electrons located on the outer shell of the atom. To determine valence electrons of oxygen you can count how many electrons ae on the last shell of it's bohr diagram.
Explanation:
H2SO4(aq)+NaOH(s)> (neutralization of both acidic protons)
H2SO4(aq)+NaOH(s)----->NA2SO4 + H20
When acid and base reaction takes place, it will form salt formation takes place. I.e., neutralization reaction. H₂SO₄+2NaOH→ Na₂SO₄+ 2H₂O.
What is neutralization reaction?A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.
H₂SO₄ is an acid and NaOH is a base. Acid react with base to form salt and water. Salt will be neutral charge and net ionic charge is zero.
Neutralization takes place when, complete dissociation takes place. If any partial dissociation, it will form acidic salt or neutral salt.
Thus complete dissociation neutral reaction is
H₂SO₄+2NaOH→ Na₂SO₄+ 2H₂O.
To find more about acid and base, refer the link below:
brainly.com/question/3941445
#SPJ2
Which statement describes a way electromagnetic waves are different from
mechanical waves?
A. Electromagnetic waves can travel only through matter.
B. Electromagnetic waves can carry energy over a distance,
0 0
C. Electromagnetic waves can transfer matter through empty space.
D. Electromagnetic waves can travel through empty space,
Answer:
D. Electromagnetic waves can travel through empty space.
Explanation:
Answer:
its drum roll please D.) Electromagnetic waves can travel through empty space
Explanation:
please wash your hands and stay safe 2021
How many moles of carbondioxide are produced when 0.2mol of sodium carbonate react with excess hydrovhloric acid
Answer:
0.2 moles of CO₂ are produced
Explanation:
Given data:
Moles of CO₂ produced = ?
Moles of Na₂CO₃ react = 0.2 mol
Solution:
Chemical equation:
Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O
Now we will compare the moles of CO₂ with Na₂CO₃ .
Na₂CO₃ : CO₂
1 : 1
0.2 : 0.2
Thus, 0.2 moles of CO₂ are produced.
What kinds of things can we learn by studying atoms?
Answer:
how and why things react, like why something turns into a gas or why something explodes.
Explanation:
Why is Mg++ smaller than Mg atom?
Answer:
The magnesium ion is much smaller than the magnesium atom because magnesium atom contains more electrons as compared to magnesium ion. Explanation: ... Whereas when an atom tends to lose an electron then it acquires a positive charge and size of the atom tends to increase.
Answer:
Because it looses it two electrons to form a stable octet Ionic form..........
