.The 1" row of the periodic table has which two elements?
On the periodic table, hydrogen and helium are the only two elements in the first row, or period, which reflects that they only have electrons in their first shell. Hydrogen and helium are the only two elements that have electrons exclusively in the 1 s 1s 1s orbital in their neutral, non-charged, state.
Pls some one help
1 mark question
Answer:
See below
Explanation:
Helium belongs to group VIII of the periodic table "Noble gases". It has only 1 electronic shell and that too contains 2 electrons according to the accommodation of the shell. Hence, it's electronic shell is complete. This is the reason, Helium is chemically unreactive.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807What is the atomic mass, in amu, of this atom?
Answer:precisely 1/12 the mass of an atom of carbon-12.
Explanation:The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. In imprecise terms, one AMU is the average of the proton rest mass and the neutron rest mass.
All atoms of an element are______.
Points: 87
Answer:
Alike
Explanation:
After moving down a group in the periodic table, the number of valence electrons
the number of Valence electrons remains the same
Question 5 (Fill-In-The-Blank Worth 2 points)
(03.05 LC)
The number that represents a neutral pH is _______.
Numerical Answers Expected!
Answer for Blank 1:
Question 6(Multiple Choice Worth 2 points)
(03.05 MC)
Which item is made from an acidic ingredient?
Detergent
Soap
Ammonia
Vinegar
Question 7(Multiple Choice Worth 2 points)
(03.05 MC)
Which substances will make a salt when combined?
Vinegar and tea
Soda and wine
Soda and ammonia
Fertilizer and detergent
Question 8(Multiple Choice Worth 2 points)
(03.05 MC)
Which description is not a property of an acid?
pH lower than 7
Turns litmus paper blue
Sour taste
Corrosive
Question 9(Multiple Choice Worth 2 points)
(03.05 MC)
Complete the sentence. When an acid is added to water, hydrogen ions __________.
increase
decrease
stay the same
disappear
What does the answer of element 3Na2S2O3?
Answer:
Explanation:
3× 22+2×32+ 6×16=
66+64+96=236
What is the mass of 1.25 x [tex]10^{24}[/tex] atoms of nitrogen?
Answer:
i dont know
Explanation:
trolololololololololololololololol
How can you find each of the 4 blood vessels when dissecting?
Answer:
that's a weird question
Explanation:
why do you need to know that?
Calculate the number of moles in 1.622 grams of boron.
Answer:
0.147
Explanation:
Moles equals mass over AR/MR so 1.662 over 11 gives 0.147
How many aluminum atoms are in 4.18 g of aluminum?
Answer:
i believe its 91
Explanation:
As you go down group one of the periodic table, the reactions become and more
Answer:
vigorous
Explanation:
As you go down group one of the periodic table, the reactions become and more vigorous.
Which of the following is true for a nuclear reaction?
O Electrons are lost
Electrons are gained
O Identity of element changes
Oldentity of element remains same
True statement for a nuclear reactions is that it changes the identity of the element.
What are nuclear reactions?Nuclear reactions are those reactions in which changes in the nucleus of atoms take place in the form of fission and fussion.
As it is said that changes are taking place in nucleus so the electrons are not gained or lost in this reactions.Identity of the element changes as atomic number of element changes due to change in the number of protons.Hence identity of element changes.
To know more about nuclear reactions, visit the below link:
https://brainly.com/question/984564
how do you find a mole (i need an example) i hate chem pls help
Answer:
I'm pretty sure its just the mass of the sample divided by the molar mass
for example if I had like 7g of carbon and wanted to find the moles, I would divide the mass I have (7g) by the molar mass (the atomic mass value on your periodic table, in this case for carbon it would be 14g)
moles = [tex]\frac{mass}{molarmass} = \frac{7}{14} = 0.5\ moles[/tex]
Hope this helped
When magnesium ium is left in moist air for several hours, the metal Sur face taanishes?why
Answer:
due to the formation of an oxide or hydroxide layer
Explanation:
magnesium is a reactive metal...when left in air it reacts with oxygen to form an oxide layer of MgO and it can react with moisture to form Mg(OH)2 LAYER ON THE SURFACE.
what is the strongest interparticle force in a sample of so2?
Answer:
The strongest intermolecular force in sulfur dioxide is dipole-dipole forces.
Explanation:
The interparticle force in [tex]SO_{2}[/tex] (sulfur dioxide) is the dipole-dipole interaction.
What is dipole-dipole interaction?
Dipole-dipole interaction is a type of intermolecular force that occurs between polar molecules. Polar molecules have a permanent dipole moment, which means they have a partial positive charge on one end and a partial negative charge on the other end. This creates an electrostatic attraction between the partial charges of neighboring molecules. The stronger the dipole moment of a molecule, the stronger its dipole-dipole interaction will be with other polar molecules.
Dipole-dipole interactions are responsible for a variety of physical properties of substances, including their boiling and melting points. Substances with strong dipole-dipole interactions tend to have higher boiling and melting points than substances with weaker interactions. In addition, the strength of dipole-dipole interactions can affect solubility, as polar substances tend to dissolve better in other polar substances due to their ability to form dipole-dipole interactions.
Learn more about dipole-dipole interaction, here:
https://brainly.com/question/30510859
#SPJ2
what is the name of the compound whose formula is n,i,2o?
Answer:
Explanation:
Dinitrogen pentaoxide is a nitrogen oxide.
...
3.1Computed Properties.
Property Name Property Value Reference
Formal Charge 0 Computed by PubChem
1. Balance the following equation. Then, given the
moles of reactant or product below, determine
the corresponding amount in moles of each of
the other reactants and products.
NH3 + O2 ———> N2 + H2O
a. 4 mol NH3 b. 4 mol N2 G. 4.5 mol O2
Answer:
[tex]to \: know \: the \: answer[/tex]
[tex]refer \: to \: the \: above \: attatchment[/tex]
Hope this helps you !!Which of the following is true for the percentage yield of a reaction?
А. It is the combined yield from the excess reactant and the limiting reactant.
B. It is the calculated yield of the product based on stoichiometry alone.
C. It is calculated based on stoichiometry as well as experimentation.
D. It is the yield of the product from the limiting reactant alone.
Answer:
It is always less than the theoretical yield
Explanation:
For many chemical reactions, the actual yield is usually less than the theoretical yield. This is due to possible loss in the process or inefficiency of the chemical reaction.
Is sweat a chemical? I am curious to know! NO LINKS OR TROLLS
Answer:
no
Explanation:
stop troll hate
Can anyone pls answerrrrt
Answer:
wdym
Explanation:
hmm
The MSDS for propane gives it a health rating of 1, a flammability rating of 4, and a reactivity rating of 0. According to the MSDS, which best describes propane? highly corrosive highly toxic highly flammable highly reactive.
Propane has MSDS rating for flammability 4, thus the compound has been highly flammable. Thus, option C is correct.
The MSDS has been the Material Safety Data Sheet . It has been given for the compounds hazardous levels. The compounds have been checked on various parameters and ranked on the scale of 0 to 4.
The compounds being less value in the parameter has 0 value, while 4 has been the maximum value.
The MSDS rating for propane has been able to deliver the compound to be:
Health rating: 1The compound has been less positive towards the health.
Flammability: 4The compound has been highly flammable.
Reactivity: 0The compound has been least reactive.
Since, propane has MSDS rating 4 for flammability, the compound has been highly flammable. Thus, option C is correct.
For more information about the MSDS rating, refer to the link:
https://brainly.com/question/2852656
Answer:A) Highly corrosive but not highly flammable
Explanation:
right on edge :)
7. Balance the following reaction under basic conditions: Al (s) + Cr2O72- (aq) -> Al3+ (aq) + Cr3+ (aq)
8. What is the ^o of the following balanced redox reaction (use the reduction potentials provided in Table 11.1
below)?
Fe3+ (aq) + Au (s) -> Fe (s) + Au3+ (aq)
9. What is G for the reaction below – calculate it from the ^o ?
Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s)
The free energy change of the reaction; Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s) is calculated to be -443.83KJ/mol.
For the reaction shown in question 7, we can divide it into half equations as follows;
Oxidation half equation;
6 Al (s) -------> 6Al^3+(aq) + 18e
Reduction half equation;
3Cr2O7^2-(aq) + 42H^+(aq) + 18e -----> 6Cr^3+(aq) + 21H2O(l)
The balanced reaction equation is;
6Al(s) + 3Cr2O7^2-(aq) + 42H^+(aq) -----> 6Al^3+(aq) + 6Cr^3+(aq) + 21H2O(l)
The E° of this reaction is obtained from;
E° anode = -0.04 V
E°cathode = +1.50 V
E° cell = +1.50 V - (-0.04 V) = 1.54 V
Given that;
ΔG° = -nFE°cell
n = 3, F = 96500, E°cell = 1.54 V
ΔG° = -(3 × 96500 × 1.54)
ΔG° = -443.83KJ/mol
Learn more: https://brainly.com/question/967776
Desperate Please Hurry
What was the evidence that Earth was round before there were photos from space?
Answer:
Explanation:
Are there any awnser choices?
1. How many centimeters are in 13.4 inches?
34.036 Thats how many
Answer:
34.036
Explanation:
There are 2.54 centimeters in one inch so you multiply 13.4 and 2.54 to get 34.036.
1. what property of gas does not change?
2. Name two gases besides oxygen found in Earth's atmosphere
Answer:
hydrogen and nitrogen or something?
Explanation:
Answer:
nitrogin and i forgot the other one srry!!
Explanation:
HELPPPPP ASAP PLSSSS !!!!!!!!!
Answer:
maybe i can help for you where the question
(BRAINLIEST AND 50 POINTS) no links
Name one organ system that isn't the Nervous system, Respiratory system, Skeletal system, and Circulatory system, and explain how can that system help keep you safe during a forest fire.
Answer:
Endocrine system
Explanation:
Endocrine system influences the function of the body's hormones via internal glands that are secreted into the circulatory system.
in a forest fire, your endocrine system would trigger the release of adrenaline which is the fight or flight hormone. it would affect your heart rate, metabolism, oxygen intake, and blood flow allowing you to move quicker and escape the fire
How many oxygen atoms
in a molecule of table sugar (C12H22011)?
ОА 45
ООО
В. 22
с 12
Op. 11
SUBMIT
Answer:
6.6242 x 10 ^ 24
Explanation:
This is the correct answer because you know there is 11 oxygen moles in 1 mole of sugar so using dimensional analysis you can solve it. You start will 11 moles of oxygen, and multiply by Avogadro's number(6.022 x 10 ^23) to get the amount of atoms. I don't see it as an answer, but I am confident in this, so I would ask your teacher specifically.
Hope this helps!
How can I increase the time over which the collision occurs?
Explanation:
The laws of physics determine that the force of impact increases with the square of the increase in speed. So, if you double the speed of a car, you increase its force of impact four times. If you triple the speed, the impact is nine times as great.Observe that the greater the time over which the collision occurs, the smaller the force acting upon the object. Thus, to minimize the effect of the force on an object involved in a collision, the time must be increased.
