Answer:16.02x1023 molec, Na₂SO4 = 119x1024 | 142.05g Na25041 Imol Naz Soy lec Na.
Explanation:
16.02x1023 molec, Na₂SO4 = 119x1024 | 142.05g Na25041 Imol Naz Soy lec Na.
The pH and pOH scales represent concentrations of [H3O+] and [OH−], respectively. What are the hydronium ion concentration and the hydroxide ion concentration of pure water at 25 °C?
Answer:n
Explanation:
2. Can you say that the matter which underwent a chemical change is still the
same substance as before? Why?
Answer:
No
Explanation:
A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.
The matter which underwent a chemical change is not still the same substance as before.
What is Chemical change?This is the type of change which occurs when two substances known as reactants react to form a new product.
The formation of a new product through bonding and other parameters thereby makes the substance to be different as it was before.
Read more about Chemical change here https://brainly.com/question/11987405
how to find the cube root of 1331
advantages of greenhill
Answer:
The correct answer is - explained below.
Explanation:
Greenhills are the home for the natural vegetation and animals that can be destroyed by the invasion of humans, however, there are many adavntages of Greenhills. The advantage of the Greenhill are as follows:
- Greenhills is the place that doesn’t flood easily
- these geographical areas are stable for the past hundred years
- It's a good building site because homes have already been built there
- Greenhills shows very less amount of weathering
- Buildings can erode easily
- Prevent erosion and helps in water for farming
-It’s not a flat area so it’s harder to farm
-These are near the nature and habitat of various animals
Which example describes biotic factors interacting with the environment?
sunlight shining through a window
O oxygen circulating in the atmosphere
O rain forming puddles on the sidewalk
O butterflies resting on the flower of a plant
Answer:
O butterflies resting on the flower of a plant
Answer:
The answer is butterflies resting on the flower of a plant.
Explanation:
A comb is rubbed with a piece of wool fabric and placed next to some scraps of paper.
The paper moves toward the comb. The movement of the paper is caused by —
static electricity
magnetic attraction
mechanical energy
chemical energy
Answer: static electricity
Explanation: rubbing the comb creates. Static charge to comb
Can someone please help a girl out and answer this plsss ...need this as soon as posible
Answer:
the anwser would be B obtain energy
Explanation:
Determine the empirical formula for the compound that has 71.98% C, 6.71% H and 21.31% O.
Thank you!
Answer:
Benzyl Acetate C9H10O2
Explanation:
Answer:
Np
Explanation:
No problem m8374893724873284972384823749832748937249873298478274923874983249872398479832497234
What pressure, in atm, would be equal to 798 mmHg?
Answer:
1.05 atm
It should be 1 atm = 760 mm; therefore, 798 mm x (1 atm/760) = about 1.05 atm.
The value of pressure in atm that would be equal to 798 mmHg is 1.05 atmospheric.
What is pressure?Pressure is a physical quantity or a kind of force which is perpendicularly applied on the surface area of any object so that force is equally distributed on that surface.
Pressure will be maesured by various unit and have relation with one another.
As we know that, 1 atm = 760 mmHg
Or 1 mmHg = 1/760atm
Given quantity of pressure is 798 mmHg and we calculate this quantity by multiply this value by 1/760 and we get,
798 mmHg = 798mmHg × 1/760atm/mmHg = 1.05 atm
Hence required value of pressure is 1.05 atm.
To know more about pressure units, visit the below link:
https://brainly.com/question/17386864
What happens when Ba (barium) and O (oxygen) combine?
Answer:
Barium reacts with oxygen when exposed to air, forming a thin passivating layer of BaO on the surface. When ingnited, barium reacts with both oxygen and nitrogen, forming a mixture of BaO, Ba 3N 2 and BaO 2.
Explanation:
Answer:
So, one ion of barium neutralizes one ion of oxygen, and so those two combine to form barium oxide, BaO .
Where can you find the atomic mass?
Answer:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Explanation:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Potato farmers in Ireland during the mid 1800s all grew the same type of potato. The potato plants were all produced as clones of one another. When a fungus infected the crop, all of the potatoes were destroyed. This occurred because these potato plants
Answer:
The crop failures were caused by late blight, a disease that destroys both the leaves and the edible roots, or tubers, of the potato plant.
A gas is collected at 20.0 °C and 725.0 mm Hg. When the temperature is
changed to 0 °C, what is the resulting pressure?
Answer:
676mmHg
Explanation:
Using the formula;
P1/T1 = P2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 725.0mmHg
P2 = ?
T1 = 20°C = 20 + 273 = 293K
T2 = 0°C = 0 + 273 = 273K
Using P1/T1 = P2/T2
725/293 = P2/273
Cross multiply
725 × 273 = 293 × P2
197925 = 293P2
P2 = 197925 ÷ 293
P2 = 676mmHg.
The resulting pressure is 676mmHg
7. Marcie fills a graduated cylinder with 15.0mL of water. Paul finds the mass of a marble to be
2.21g, then drops the marble into the graduated cylinder. If the meniscus on the cylinder is
now at 16.3mL, what is the density of the marble?
Answer:
1.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
volume = final volume of water - initial volume of water
volume = 16.3 - 15 = 1.3 mL
We have
[tex]density = \frac{2.21}{1.3} = 1.7 \\ [/tex]
We have the final answer as
1.7 g/mLHope this helps you
A student argued that there is less gravity on the Moon than on Earth. The student explained, "You need an atmosphere to have gravity. The Moon doesn't have an atmosphere and therefore doesn't have a lot of gravity. Earth has a thick atmosphere and therefore has much more gravity." What do you think about the student's claim?
A. The student is correct because the atmosphere is what creates the gravitational pull on Earth
B. The student is correct because the mass of the object determines how thick the atmosphere will be
c. The student is incorrect because gravity is determined by the mass of the object and not the atmosphere
D. The student is incorrect because the thickness of the atmosphere will determine the amount of gravity on the object
Answer:
C
Explanation:
The student is incorrect.
The atmosphere weighs very little compared to the material the earth is made of. Gravity is effected by mass. The more mass, the more gravity. The only correct (and it is totally correct) answer is C
Please help with this chem question I’ll mark you brainiest. The answer isn’t A) I already tried that option.
La predicción de las propiedades de un elemento en función de la posición que ocupa en el sistema periódico es una
Answer:
Los elementos de la tabla periódica se distribuyen sobre la base de similitudes.
Explicación:
Los diferentes tipos de elementos se distribuyen en 8 grupos de tabla periódica en función de sus propiedades. Los elementos que tienen propiedades similares se colocan en el mismo grupo. Por ejemplo, el primer grupo de la tabla periódica son los metales alcalinos. Todos los metales alcalinos tienen algunas propiedades similares, es decir, un electrón en su capa más externa, alta reactividad y forma metálica, mientras que, por otro lado, los ocho elementos del grupo son gases nobles que tienen una capa más externa completa y no tienen reactividad.
Explain the difference between a covalent bond formed between two atoms of the same element and a covalent bond between two atoms of two different elements.
Answer:
Polarity
Explanation:
Covalent bonds between two atoms of the same element (diatomics) are nonpolar because neither atom is more electronegative. Covalent bonds between atoms of two different elements are often polar and must be polar to some extent because of differences in electronegativity between the two atoms involved.
why is detergent called soapless soap
Answer:
Detergents are referred to as soapless soaps because they have a washing action similar to soap but do not contain the typical chemical contents of soaps, such as sodium or potassium salts of long chain fatty acids.
Explanation:
How many grams are in 10 moles of ozone
Answer:
479.98199999999997
Explanation:
What is the general formula for alkanes?
Answer:
Alkanes have the general formula of CnH2n+2 where n is the number of carbon atoms.
Predict whether a reaction will occur when HClO and Sr(OH)2 solutions are mixed, if yes determine spectator ions in the ionic equation.
Answer:
[tex]ClO^-\\\\Sr^{2+}[/tex]
Explanation:
Hello there!
In this case, according to the reaction between hypochlorous acid and strontium hydroxide which yields stontium hypochlorite and water as a neutralization reaction:
[tex]2HClO(aq)+Sr(OH)_2(aq)\rightarrow Sr(ClO)_2(aq)+2H_2O(l)[/tex]
Thus, since HClO is a weak acid, it is not fully ionized so the complete ionic equation turns out to be:
[tex]2H^++2ClO^-+Sr^{2+}+2(OH)^-\rightarrow Sr^{2+}+2(ClO)^-+2H_2O(l)[/tex]
Whereas the spectator ions, which remain the same at both sides of the equation, are:
[tex]ClO^-\\\\Sr^{2+}[/tex]
Best regards!
Gallium is a metallic element in Group III. It has similar properties to aluminium.
(a) (i) Describe the structure and bonding in a metallic element.
You should include a labelled diagram in your answer.
Answer:
Gallium has Orthorhombic and forms ionic bonds with metals
Explanation:
The structure of gallium is Orthorhombic and it has a high neutron capture cross section. It is very stable in dry air but oxidizes in moist air. It reacts with oxygen to form Ga2O3. It has a valence of III. Its electronic configuration is
Ar 3d10 4s2 4p1
It is found in the 3A group of periodic table and it mostly forms ionic bonds with metal.
For the reaction
2 Al + 6 HCl → Al2Cl6 + 3 H2
how much hydrogen can be formed when 60 g
of aluminum reacts with excess hydrochloric
acid?
Answer in units of g.
Answer:
6.67 grams of hydrogen can be formed when 60 g of aluminum reacts with excess hydrochloric acid.
Explanation:
The balanced reaction is:
2 Al + 6 HCl → Al₂Cl₆ + 3 H₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al: 2 moles HCl: 6 moles Al₂Cl₆: 1 mole H₂: 3 molesBeing the molar mass:
Al: 27 g/mole HCl: 36.45 g/mole Al₂Cl₆: 266.7 g/moleH₂: 2 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al: 2 moles* 27 g/mole= 54 grams HCl: 6 moles* 36.45 g/mole= 218.7 gramsAl₂Cl₆: 1 mole* 266.7 g/mole= 266.7 gramsH₂: 3* 2 g/mole= 6 gramsYou can apply the following rule of three: if 54 grams of aluminum forms 6 grams of hydrogen, 60 grams of aluminum will form how much mass of hydrogen?
[tex]mass of hydrogen=\frac{60 grams of aluminum*6 grams of hydrogen}{54 grams of aluminum}[/tex]
mass of hydrogen= 6.67 grams
6.67 grams of hydrogen can be formed when 60 g of aluminum reacts with excess hydrochloric acid.
QUE VENTAJAS TIENE PARA LA PLANTA Y EL CULTIVO LA PERMANENCIA DEL POTASIO COMO CATION MONOVALENTE (K+)?
Explanation:
Son muchos los beneficios del catión monovalente (K+) en las plantas y cultivos, mencionaremos algunos:
-Interviene en el proceso de apertura y cierre de los estomas; el catión (k+) ayuda a que los estomas puedan realizar correctamente el proceso de la fotosíntesis es decir la absorción del dióxido de carbono para producir oxígeno y agua; este proceso ayuda a que la planta pueda fabricar su propio alimento es decir transformar materiales inorgánicos en orgánicos como azúcares y carbohidratos que son aprovechables por la planta para realizar diversas funciones catalíticas como la respiración celular,la fosforilación y la síntesis de proteínas; este proceso también contribuye a que la planta pueda almacenar y retener suficiente agua lo cual ayuda a evitar el estrés hídrico en la planta.
Por lo tanto si la planta tiene una buena concentración de potasio como catión monovalente(k+); es posible que tenga un buen crecimiento y desarrollo radicular ,así mismo la calidad de los cultivos será muy buena,seran cultivos muy nutritivos y saludables. Algunos cultivos que necesitan una alta cantidad de potasio son los cítricos y el banano.
How to find the number of protons in an element?
Answer:
Locate the element’s atomic number. The atomic number is located above the element symbol, in the upper left-hand corner of the square. The atomic number will tell you how many protons make up a single atom of an element.
Explanation:
Answer:
To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number. number of neutrons = mass number - atomic number.
Explanation:
i hope it helps and have a great day
What volume will 1000 grams of nitrogen dioxide occupy at 380 mmHg at 0°C
0.69(78)Explanation:
I didn’t study for this lol if your answer correct I’ll mark ur answer brainliest
Answer:
3
Explanation:
3 is the answer is did this a little while ago
which would more easily give up electrons during bonding?
Li
Si
I
Answer:
Lithium, Li
Explanation:
Metallic elements are elements which form ions by loss of electrons. They are electropositive elements. During the formation of compounds, they easily give up or donate their electrons to other atoms to become positively charged ions. Examples of metals include, sodium, lithium, magnesium, etc
The ionization process of metals is generally shown below:
X ---> X+ + e-
Where X is a metal, and e- rare electrons
Non-metals are elements which form ions by gain of electrons. They are electronegative elements. During the formation of compounds, they accept electrons from electropositive elements to form negatively charged ions or anions. Examples of non-metals include oxygen, chlorine, iodine, etc.
The ionization process of non-metals generally, is shown below:
Y + e- ----> Y-
Semi-metals like silicon, usually form compounds by sharing of electrons with other elements.
Please help me with this net ionic chem equation
Answer:
C) H+(aq) + OH-(aq) ---》 H2O(aq)