Answer:
NO OF NEUTRON =MASS NO -ATOMIC NO
=39-19
=20
bcz atomic no is equal to no of electrons
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Using the equation above, how many moles of Na are produced when 2.75 moles of H2 react with excess NaCl? will give BRAINLIEST
Answer:
5.5 moles of sodium are produced
Explanation:
Given data:
Number of moles of hydrogen = 2.75 mol
Number of moles of Na produced = ?
Solution:
Chemical equation:
H₂ + 2NaCl → 2HCl + 2Na
Now we will compare the moles of hydrogen and sodium from balance chemical equation:
H₂ : Na
1 : 2
2.75 : 2/1×2.75 = 5.5 mol
Thus, 5.5 moles of sodium are produced.
A temperature increase causes the particles to what ??!
Two different isotopes of an element have different?
For a chemical change to happen what must atoms be
Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
5. An element becomes an ion with a -3 charge. What is the most likely group on the periodic table that this elements belongs in? *
What role does valence electrons play in reactivity for an element?
Explanation:
The valence electrons within an atom is the number of electrons in its outermost shell.
These electrons are used by an atom to react with one another. They determine the extent to which an atom is ready to combine either by losing, gaining or sharing these electrons.
Every atom desires to have a completely filled outermost shell. Only the elements in group 8 have a complete octet. The need to attain stability is driven by the number of electrons in their valence shell. Therefore, some atoms are very reactive. Those needing one electrons to complete their octet and also those that must lose one electron are very reactive.What is the Molar Mass of Cl4
Answer:473.39626 g/mol
Explanation:
Answer:
153.82 g/mol
Explanation:
when the foil is negatively charged will all of the foil still be made up of aluminum atoms
Answer:
Yes.
Explanation:
Electric charge cannot change the elemental composition of a substance.
The application of charge to the aluminium foil does not change the composition of the foil and hence the foil will still be made up of aluminium atoms.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Isotopes are atoms of the same element that have the same chemical property but may not have the same physical properties A true B false
Answer:
false
Explanation:
Atoms of the same element that differ in their numbers of neutrons are called isotopes. Many isotopes occur naturally. ... Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and elec
Answer:
False
Explanation:
It says that it may not have the same physical properties but it always have the same physical properties.
what is the definition of base
While both comets and asteroids are found to orbit the sun in our solar system which system which choice correctly explain how they are different
Answer:
Comets are made of ice, dust, and rocky material. Asteroids are made of rock and metal material.
Explanation:
thats how they are different from each other
Guys please I need an answer for this asap
Mg+2HCl -> MgCl2+H2
0.2 mole of mg reacted with 0.2 of HCl
What is the mass of hydrogen gas produced?
Answer:
Mass of hydrogen gas produced = 0.2 g
Explanation:
Given data:
Number of moles of Mg = 0.2 mol
Number of moles of HCl = 0.2 mol
Mass of hydrogen gas produced = ?
Solution:
Chemical equation:
Mg + 2HCl → MgCl₂ + H₂
Now we will compare the moles of of hydrogen with Mg and HCl.
Mg : H₂
1 : 1
0.2 : 0.2
HCl : H₂
2 : 1
0.2 : 1/2×0.2 = 0.1
HCl produced less number of moles of hydrogen gas it will act as limiting reactant.
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 0.1 mol × 2 g/mol
Mass = 0.2 g
Will the average vibrational energy of nitrogen gas (N2) at 22 c be greater than, less than, or equal to the average vibrational energy of NaCl at 22 c?
The average vibrational energy of nitrogen gas (N₂) at 22 c be greater than the average vibrational energy of NaCl at 22 c.
The average distance between molecules of gaseous substance is greater than the average distance between molecules of liquid and solid substance.
The molecules of the gaseous substances always move with greater speed due to large distance between the molecules.
The molecules of a solid substance are closely packed together and this reduces the average speed of the molecules.
Nitrogen gas (N₂) is a gaseous substance while sodium chloride (NaCl) is a solid substance.
Thus, we can conclude that the average vibrational energy of nitrogen gas (N₂) at 22 c be greater than the average vibrational energy of NaCl at 22 c.
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What elements are pliable??
Answer:
Yttrium, Silver,Iron,Nickel and Copper I believe
HELP!!!! I NEED THE EQUATION FOR Neptunium-237 undergoes alpha, alpha, beta, gamma, alpha, beta, alpha, gamma, and alpha decay.
I WILL MARK BRAINLIEST!!!!!!!
Answer:
..
Explanation:
2
What is the weight of an object of mass 8.5 kg?
Answer:83.3 (kg*m)/s^2
Explanation:weight is the combination of the mass of an object and the gravitational force on it.
Weight=mass (kg) * gravity
Gravity=9.8 m/s^2
Weight= (8.5 kg)*(9.8 m/s^2)
There are 83.3N of weight in an object of mass 8.5 kg.
HOW TO CALCULATE WEIGHT:
The weight of an object is the mass of the object in relation to gravity. Weight is measured in Newton (unit of force). The weight can be calculated by multiplying the mass of the object by acceleration due to gravity on Earth i.e. Weight (N) = mass (kg) × gravity (m/s²)According to this question, an object with a mass of 8.5kg is given. The weight is calculated as follows:Weight = 8.5kg × 9.8m/s²Weight = 83.3NTherefore, there are 83.3N of weight in an object of mass 8.5 kg.Learn more at: https://brainly.com/question/8164654?referrer=searchResults
Who discovered electrons using Crookes tube?
a.) Democritus
b.) Ernest Rutherford
c.) Hantaro Nagaoka
d.) J. J. Thomson
e.) John Dalton
f.) Niels Bohr
Answer:
William Crookes????????????????
Help 15 points!!!
Complete the following combustion reaction.
Answer:
C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O
2C₈H₁₈ + 25O₂ —> 16CO₂ + 18H₂O
Explanation:
The reaction above is simply termed combustion reaction in which an organic compound react with oxygen to produce carbon dioxide and water. Thus, we can obtain the balanced equation for the reaction reaction as follow:
C₈H₁₈ + O₂ —> CO₂ + H₂O
There are 8 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 8 before CO₂ as shown below:
C₈H₁₈ + O₂ —> 8CO₂ + H₂O
There are 18 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 9 before H₂O as shown below:
C₈H₁₈ + O₂ —> 8CO₂ + 9H₂O
There are 2 atoms of O on the left side and a total of 25 atoms on the right side. It can be balance by writing 25/2 before O₂ as shown below:
C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O
Thus, the equation is balanced!
The above equation can also be written as follow:
C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O
Multiply through by 2
2C₈H₁₈ + 25O₂ —> 16CO₂ + 18H₂O
what do you meaning seachants? write with example.
Answer:
answer
Explanation:
simile is a figure of speech that compares two different things in an interesting way. The object of a simile is to spark an interesting connection in a reader's or listener's mind. A simile is one of the most common forms of figurative language. Examples of similes can be found just about anywhere from poems to song lyrics and even in everyday conversations.
Similes and metaphors are often confused with one another. The main difference between a simile and metaphor is that a simile uses the words "like" or "as" to draw a comparison and a metaphor simply states the comparison without using "like" or "as".
An example of a simile is: She is as innocent as an angel. An example of a metaphor is: She is an angel. Do you see the difference? The simile makes a direct comparison, the metaphor's comparison is implied but not stated.
In the sixteenth century, the geocentric theory was a daim with substantial evidence. Which of the following best describes why scientists began to regard the heliocentric theory as more acceptable?
Answer:
The heliocentric theory was better supported by data explaining the rotation of the planets and other bodies in the solar system.
Explanation:
3. Could a molecule
contain only one atom?
You add 7.8 g of iron to 23.20 mL of water and observe that the volume of iron and water together is 24.19 mL . Calculate the density of iron.
Answer:
7.88g/mL is density of iron
Explanation:
As water and iron are insoluble, the volume of displaced fluid (Water) is equal to the volume of the solid (Iron). That means volume of the iron is:
24.19mL - 23.20mL = 0.99mL is the volume of iron
As density is the ratio between mass -7.8g- and volume of a compound -0.99mL- the density of iron is:
7.8g / 0.99mL =
7.88g/mL is density of iron1.5 moles of N2 gas = ______L of N2 gas at STP
Answer:
33.6 lliter
Explanation:
volume in stp = no of moles *22.4
=22.4* 1.5=33.6liter
What are the 4 chambers and what is the function of each?
Answer:
Where are these Chambers located ], there is hundreds of them in the world
please help
if a molecule is polar, what is true about the distribution of its valence electrons
What are the coefficients that would correctly balance this reaction?
____Ni + ____C4H8N2O2 → ____Ni(C4H8N2O2)2
a.1,2,1
b.2,2,1
c.2,1,1
d.2,2,2
The coefficient of Ni+ in this reaction is 1 and that of C₄H₈N₂O₂ is 2 and the coefficient of the product Ni(C₄H₈N₂O₂ )₂ is 2. Hence option A 1,2,1 is correct.
What is a balanced reaction?A balanced reaction is represented by a chemical equation where all reactants and products are correct stoichiometry and their states are represented in brackets.
In a balanced chemical equation, each element have to equal in number on both side. For example, if there four oxygen in the reactant side then the product side must have four oxygens.
If the number is not equal we can balance them by multiplying with simple integers. These numbers are called coeffcients.
In the given reaction there are one nickel in both side but two C₄H₈N₂O₂ are there in the product side. Therefore we must multiply 2 for C₄H₈N₂O₂ in the reactant side.
Hence, we get the coefficient for C₄H₈N₂O₂ in reactant side 2 and in the product side for the nickel complex 1.Thus, option a 1,2,1 is correct.
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explain why even though it may be sunny outside its not as warm during the summer
For part of our orbit the northern half of Earth is tilted toward the Sun. This is summer in the northern hemisphere; there are longer periods of daylight, the Sun is higher in the sky, and the Sun's rays strike the surface more directly, giving us warmer temperatures.
Answer:
the sun is further away
Explanation:
ignore
Good quality water is needed for a healthy life.
In the United Kingdom, obtaining safe water for drinking is as simple as turning on a tap. The water is made safe to drink by what and companies.
However, in many parts of Africa and Asia, water used for drinking is contaminated and untreated. It is estimated that 2.2 million people die each year as a result of drinking contaminated water.
Explain why water for drinking is filtered and then treated with chlorine.
Answer:
Simply cuz so u can drink It without bacteries chlorine also changes a bit taste depends on RM
!Do not use this answer for cheating, please only use my answers to check your own!
Before tap water was found, people would use rocks, gravel, and sometimes even thick cloth to filter water. If you do not filter water, there is a huge chance that bugs, bacteria, viruses, and other things may be entering your body. Today some houses still have the past was of filtering, with rocks and gravel. Except chlorine is used to kill any bacteria that was left over the rocks and gravel may of missed.
Please help due today
A theory is accepted by scientists when
A. It becomes a law
B. It can be shown with a model
C. It describes how nature works
D. It is supported by adequate data
Answer:
D. It is supported by adequate data
Explanation:
A theory is a well-substantiated explanation
Hope this helps!
Have a great day. :)
