Answer:
proton number for element X is 6
while proton number for element Y is 7
X and Y are in the same row but not the same family on the periodic table cause element X belongs to group 6 also known as carbon family while Y belongs to group 7 also known as nitrogen family
How many grams are in 0.50 moles of LiBr?
What general trend does electronegativity follow on the periodic table?
Answer:
On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.
Find the number of protons, neutrons, and electrons in 6429Cu.
Answer:
bottom :)
Explanation:
Question: How Many Protons, Neutrons, And Electrons Are In A Neutral Atom Of Copper, Cu, With An Atomic Number Of 29 And Mass Number Of 64? A. Protons = 64, Neutrons = 29, Electrons = 29 B. Protons = 35, Neutrons = 29, Electrons = 35 C.
Using a pipette, dispense a drop of water on a level glass surface. Compare the shape of this drop with the shape of the water drop on the waxed paper.
Oil drop on waxed paper is less dispersed since it has non-polar interactions therefore occurs circular in shape.
What is polar interaction?Polar interactions are the strong and long-range interactions between molecules that are based on electrostatic attraction.
In this case, the shape of this drop with the shape of the water drop on the waxed paper is that the oil drop on waxed paper is less dispersed since it has non-polar interactions
Also, oil and water do not have any interactions so the oil drop is more dispersed and occurs to be oval in shape.
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49. How much precipitate would result if you have 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation
a. 5g
b.70 g
c. 35g
d. 13g
Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.
What is Solubility ?the maximum quantity of a substance that will dissolve in a certain quantity of water at a specified temperature.
From the Solubility Graph of NaCl , we can see that the solubility of NaCl at 10 C is around 36.5gm/L.
If it is cooled down to saturation we will see the precipitate forming and that will be equal to the difference of solute present and the solubility.
As it is given that 50gm of solute is present
The precipitate will be 50- 36.5 gm, = 13.5 gm.
Therefore Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.
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A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution
[tex]~~~~~\text{pH} + \text{pOH} = 14\\\\\implies \text{pOH} = 14- \text{pH}\\\\\implies \text{pOH} = 14 - 11.8\\\\\implies \text{pOH} = 2.2\\\\\text{Now,}\\\\~~~~~~~\text{pOH}= -\log\left[\text{OH}^{-1}\right]\\\\\implies \left[\text{OH}^{-1} \right] = 10^{-\text{pOH}} = 10^{-2.2}~ = 0.006309~M\\\\\text{Hence the concentration of OG}^{-1}~ \text{is 0.006309~M}[/tex]
During dehydration synthesis, an enzyme removes a ____________ functional group from the monomers of one organic molecule and a hydrogen from another monomer, linking monomers together to form a ____________ . This chemical reaction also forms ____________ .
Linking monomers together to form a polymer .This chemical reaction also forms water molecules.
What is Polymerization?This is a type of reaction which involves the linking of two or more monomers to form a polymer.
Dehydration reaction forms water molecules as part of the product thereby making it the most appropriate choice.
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How much iodine (I2), in grams, should be added to water to produce 2.5L of solution with a molarity of 0.56M?
Molarity=Moles of solute/Volume of solution in L
So
0.56M=moles/2.5Lmoles=0.56(2.5)moles of Iodine=1.4molMads of Iodine
Moles(Molar mass)1.4(126.9)177.66g4 FeS₂ + 11 0₂ → 2 Fe₂O3 + 8 SO₂
How many moles of O2 are required to react completely with 10.5 moles of FeS2
From the equation, we see that for every 4 moles of pyrite consumed, 11 moles of oxygen are consumed.
So, the answer is (10.5/4)(11) = 28.875 mol
Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can't balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.
The strategy for balancing the equations is by looking at the number of atoms on each side of the equation and adding coefficients to the molecules.
What is a balanced equation?A balanced equation is an equation for a chemical reaction where the number of atoms for each element in the reaction and the total charge is the same for the reactants and the products,
A strategy that will help balance equations more quickly is balancing by inspection. Here, you look at how many atoms you have on each side of the equation and add coefficients to the molecules to balance out the number of atoms.
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can you guys please help me on these 2 questions im stuck
Answer:
O2 is limiting reactant
Explanation:
4 x Al = 107.924 gm
6 x O = 95.994 gm
you need ALMOST as many grams of O2 as Aluminum....
you are short of O2 <======the limiting reactant
How many moles of Calcium Oxide are needed to produce 4 moles of Calcium Hydroxide?
Taking into account the reaction stoichiometry, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
Reaction stoichiometryIn first place, the balanced reaction is:
CaO + H₂O → Ca(OH)₂
By reaction stoichiometry (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:
CaO: 1 mole H₂O: 1 moleCa(OH)₂: 1 moleMoles of CaO requiredThe following rule of three can be applied: If by stoichiometric reaction 1 mole of Ca(OH)₂ is produced by 1 mole of CaO, 2 moles of Ca(OH)₂ are produced by how many moles of CaO?
[tex]moles of CaO=\frac{2 moles of Ca(OH)_{2}x1 mol of CaO }{1 mole of Ca(OH)_{2}}[/tex]
moles of CaO= 2 moles
Finally, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
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Select the correct answer. Which statement is true of a chemical change? A. It involves changes in the molecular structure. B. It involves changes in phase but not changes in the molecular structure. C. It involves dissolving one substance into another. D. It involves a change in the state, or phase, of a substance. E. It involves the process of separating two or more dissolved substances.
Which of the following is an engineer's solution to a problem?
OA. Searching for the existence of planets around a distant star
OB. Designing shatter-resistant windows for a car
C. Observing the reaction when two substances are combined
D. Recording species of plants that inhabit an island
An engineer's solution to a problem would involve designing shatter-resistant windows for a car.
Who is an engineer?An engineer is a person who applies the knowledge of science to design tools and equipment which are used to solve the problems facing man.
An engineer specializes in the scientific field of engineering.
Some tools or devices produced by engineers are machines and vehicles such as cars and aeroplanes.
Therefore, an engineer's solution to a problem would involve designing shatter-resistant windows for a car.
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A bottle contains 3.100 ml of a liquid. the total mass of the bottle and the liquid together is 6.300 g. the mass of the empty bottle is 4.240 g. what is the density of the liquid?
The density of the liquid in the bottle will be 0.665 g/mL
What is density?Mathematically, density is given as:
Density = mass/volume
Mass of liquid = mass of bottle + liquid - mass of empty bottle
= 6.3 - 4.24 = 2.06 g
volume of liquid = 3.100 mL
Density of liquid = 2.06/3.100 = 0.665 g/mL
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which of the following is not balanced equation
Answer: (2)
Explanation:
There are 16 oxygen atoms on the reactant side but only 10 on the products side.
Which two factors decrease as the averagespeed of the particles in a sample
of matter decreases?
o a. the average mass of the particles
b. the temperature of the sample
o c. the weight of the sample
d. the average kinetic energy of the particles
Answer:
d the average kinetic energy of the particles
Which structure is the Lewis structure for ammonia (NH3)?
Answer:
C
Explanation:
Because NH3 has 8 valence electrons, and Hydrogen can only have 1 bond
Calculate the molarity of an HCl solution if 23.88 mL of it reacts with 6.5287 grams of sodium carbonate (106 g/mol) according to
2HCl + Na2CO3 → 2NaCl + H2O + CO2 Answer in units of mol/L.
I NEED HELP
Answer:
5.158 mol/L
Explanation:
To find the molarity, you need to use the formula:
Molarity (M) = moles / volume (L)
You have been grams sodium carbonate. You need to (1) convert grams Na₂CO₃ to moles (via molar mass), then (2) convert moles Na₂CO₃ to moles HCl (via mole-to-mole ratio from equation), then (3) convert mL to L (by dividing by 1,000), and then (4) use the molarity equation.
Steps 1 - 2:
2 HCl + 1 Na₂CO₃ ----> 2 NaCl + H₂O + CO₂
6.5287 g Na₂CO₃ 1 mole 2 moles HCl
-------------------------- x ------------- x ------------------------- = 0.12318 mole HCl
106 g 1 mole Na₂CO₃
Step 3:
23.88 mL / 1,000 = 0.02388 L
Step 4:
Molarity = moles / volume
Molarity = 0.12318 mole / 0.02388 L
Molarity = 5.158 mole/L
**mole/L is equal to M**
Fe(no3)3 + na0h > fe(oh)3 + nano3 is balanced or unbalanced?
Answer:
Unbalanced
Explanation:
[tex]\text{Fe}(\text{NO}_3)}_3+ \text{NaOH} \rightarrow \text{Fe(OH)}_3 + \text{NaNO}_3\\\\\text{Balanced reaction:}\\\\\text{Fe}(\text{NO}_3)}_3+ 3\text{NaOH} \rightarrow \text{Fe(OH)}_3 + 3\text{NaNO}_3[/tex]
Which describe beta decay? check all that apply. in beta decay, a proton becomes a neutron and a positron. in beta decay, a neutron becomes a proton and an electron. in beta decay, a neutron becomes a proton and a gamma ray. beta decay releases energy. beta decay releases a helium-4 nucleus.
The statements which best describe beta decay are: option 1, 2 and 4.
What is a beta particle?A beta particle can be defined as an isotope which typically undergoes radioactive decay through the emission of a radiation with a -1 charge.
Based on scientific information and records from radioactivity, we can infer that the statements which best describe beta decay are:
During beta decay, an atom of proton becomes a neutron and a positron. During beta decay, an atom of neutron becomes a proton and an electron.Beta decay releases energy.Read more on beta decay here: https://brainly.com/question/12448836
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Answer:
1,2,4
Explanation:
help me plss ty in advanced
Answer:
See below ~
Explanation:
The respective pairs are :
× Ribose ⇒ The sugar of RNA
× Double helix ⇒ Structures of DNA
× Watson & Crick ⇒ Proposed the double helix model
× Base pair ⇒ Adenine - Thymine pair
× Cytosine ⇒ The nucleotide pair of Guanine
You wish to make a 0.285 M hydroiodic acid solution from a stock solution of 12.0 M hydroiodic acid. How much concentrated acid must you add to obtain a total volume of 50.0 mL of the dilute solution
The amount, in mL, of the concentrated acid required, would be 1.1875 mL
DilutionFrom the dilution equation:
m1v1=m2v2 where m1 and m2 = molarity before and after dilution, and v1 and v2 = volume before and after dilution.
m2 = 0.285M, m1 = 12.0M v2 = 50.0 mL
v1 = m2v2/m1 = 0.285x50/12 = 1.1875 mL
Thus, 1.1875 mL of the acid would be taken and diluted with water up to the 50 mL mark.
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6. a sample of nitrogen gas occupies 28.5 l at stp. how many moles of nitrogen are present?
Answer:
1 mol of N2
Mole of N2= 28.5 L × -------------------
22.4 L of N2
=1.272 mole of N2
please help!
What happens when a hot metal rod with a temperature of 100 degrees is placed in 10 degree cold water ?
1) the temperatures of the rod & water will both decrease
2) heat will travel out of the metal rod & into the water
3) the temperatures of the rod & water will both decrease
4) the temperatures of the rod & water will both increase
Answer:
What happens when a piece of hot metal is dropped in room temperature water. Over time the metal will cool and the water will heat up. Eventually the two objects will have the same temperature. They are then said to be in thermal equilibrium with one another.
Explanation:
i hope this helps you!!
Explain what is meant by the phrase 'the heat death of the universe."
Answer:
See explanation.
Explanation:
Are you literally posting your entire you chemistry homework on this site, one question at a time? Anyways, the heat death refers to the second law of thermodynamics and entropy. Heat is constantly flowing from warmer to cooler objects and never the other way around. This heat flow increases entropy, which is constantly increasing. The universe will eventually disperse all of its heat energy away to continuously increase entropy and reach a limit as the temperature reaches 0 K at which point all molecular motion will cease and so will the life of the universe.
Answer:
hypothesis on the ultimate fate of the universe, which suggests the universe would evolve to a state of no thermodynamic free energy and would therefore be unable to sustain processes that increase entropy.
Explanation:
How many grams of aluminum chloride can be produced from 7.32g of ammonium perchlorate?
Answer:
2.77g of [tex]AlCl_{3}[/tex] can be produced.
Explanation:
Use stoichiometry.
Balanced equation: [tex]3Al + 3NH_{4} ClO_{4}[/tex] ⇒ [tex]Al_{2} O_{3} + AlCl_{3} +3NO + 6H_{2} O[/tex]
[tex]NH_{4} ClO_{4} : AlCl_{3}[/tex]
3 : 1 **[tex]n=\frac{m}{M}[/tex]
0.0623** : [tex]x[/tex] [tex]n=\frac{7.32}{117.49}[/tex] = 0.0623
[tex]3x=0.0623\\x=0.020767[/tex]
[tex]n=\frac{m}{M}[/tex]
[tex]m=nM[/tex]
m= (0.020767)(133.34)
m= 2.77g
Part A
Look at the graphical display for the group 1 elements. What pattern do you observe about atomic radii as you move from
ydrogen at the top of the table to francium at the bottom?
The atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.
What is atomic radii ?The total distance from the nucleus of an atom to the outermost orbital of its electron is known as its atomic radii or atomic radius.
As we go down the group, the number of orbits or shell increases.
Hence, atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.
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What is the name of this structural formula?
Answer:
2-methylbutane
Explanation:
First, you want to identify the largest number of sequential carbons. In this case, the parent chain is made up of 4 carbons. This makes the base name, butane.
Next, you want to identify any branches. There is a branch made up of 1 carbon, and these are referred to as a methyl group. The lowest possible carbon on the parent chain this branch is attached to is the second carbon.
When you put these factors together, you are left with the name: 2-methylbutane.
What is the name of this structural formula?
Answer:
3-methyl pentane
Explanation:
The longest chain of carbons is 5, so it will have the prefix pent-.
The first branch is on the 3rd carbon, and it is a 1 carbon branch. This means the branch will be called 3-methyl.
Now to find the suffix we need to count the carbons and the hydrogens. There are 6 carbons and 14 hydrogens, which follows the formula for an alkane ([tex]C{_n}H{_{n+2}}[/tex]). This gives it the suffix -ane.
Now we can name the compound:
3-methyl pentane
That is the answer
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