homogenous mixtures
A group in the periodic table has the same
A. number of protons.
B. number of neutrons.
C. number of outer shell electrons.
D. shell number.
Hey there! :)
Answer:
C. Number of outer shell electrons.
Explanation:
Groups consist of the vertical columns of the periodic table, such as 1A, 2A, etc. (Not including transition metal groups) which depict the number of valence electrons, or the number of electrons in the atom's outer shell.
For example, Oxygen, which is in group 6A, contains 6 valence (outer shell) electrons.
Answer:
number of outer shell electrons.
Explanation:
can anyone answer this because i’m kind of confused!!
You have the correct answer. It is choice D. Increasing the reactants will mean there is more matter to collide with one another to form chemical bonds. The more matter that collides, the faster the reaction rate.
The table shows the atomic number of four atoms.
Which one is NOT a metal?
Answer:
A. Argon
Explanation:
Argon is a nonmetal. It is a noble gas with an atomic number of 18.
Based on the periodic table of chemical elements, the atom which is not a metal is the atom with an atomic number (number of protons) of 18.
Given the following data:
Number of protons = 18Number of protons = 19Number of protons = 19Number of protons = 20An chemical element can be defined as a pure substance which is made up of atoms that are having the same atomic number (number of protons) in its atomic nucleus.
This ultimately implies that, an atomic number is equal to the number of protons in the nucleus of an atom of a chemical element.
In Chemistry, the following chemical elements have this atomic number:
Argon = 18 = 2:8:8Potassium = 19 = 2:8:8:1Calcium = 20 = 2:8:8:2Note: Both group 1 and 2 chemical elements are metals.
However, an atom with an atomic number of 18 is in group 8 of the periodic table and as such isn't a metal but a noble gas.
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Explore how the identity of reactants and products can be used to classify types of reactions
What precipitate sometimes forms during an acid-base neutralization reaction?
a)
sugar
b) water
c) salt
d) carbon
Answer:
B. water i think
Explanation:
The lead iodide forms what is called the precipitate, while the solvent (water) and soluble reactants and products are termed the supernate or supernatant. Formation of a precipitate drives the reaction in a forward direction as the product leaves the solution. Neutralization reactions are double displacement reactions between acids and bases.
PLEASE HELP FAST
Which is the number of moles of carbon dioxide produced from the complete combustion of 5.7 moles of ethanol?
C2H2O + O2 → CO2 + H2O
of
Select one:
O a. 11.4
O b. 17.1
O c. 2.85
O d. 22.8
The molar mass of H2O is 18.01 g/mol. The molar mass of O2 is 32.00 g/mol. What mass of H2O, ins grams, must react to produce 50.00 g of O2
Answer:
56.28 g
Explanation:
First change the grams of oxygen to moles.
(50.00 g)/(32.00 g/mol) = 1.5625 mol O₂
You have to use stoichiometry for the next part. Looking at the equation, you can see that for every 2 moles of H₂O, 1 mole of O₂ is produced. Convert from moles of O₂ to moles of H₂O using this relation.
(1.5625 mol O₂) × (2 mol H₂O/1 mol O₂) = 3.125 mol H₂O
Now convert moles of H₂O to grams.
(3.125 mol) × (18.01 g/mol) = 56.28125 g
Convert to significant figures.
56.28125 ≈ 56.28
The images below shows an electron orbital diagram for a
specific element. What is the element? (Hint: count the
number of arrows-- what do they represent?)
Answer:
Nitrogen
Explanation:
Each arrow counts as one electron so in total you have 7 arrows = 7 electron. From periodic table, we know Nitrogen has 7 electrons so the element here is nitrogen.
Answer:
Nitrogen
Explanation:
1 arrow is 1 electron. In total you have 7 arrows which means you have 7 electron. Nitrogen has 7 electrons.
Calculate the number of moles in each of the following:
a. 82.0 g of Ag
b. 0.288 g of C
c. 15.0 g of ammonia, NH3 d. 7.25 g of CH4
e. 245 g of Fe2O3

Answer:The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elem
Explanation:
Scientific evidence shows that Earth's diameter, and thus overall size, does
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
O c. Contracting Earth
D. Continental drift
U
SUBMIT
Answer:
The evidence goes against A. Expanding Earth and B. Contracting Earth
hi :) why do ionic compounds conduct electricity in aqueous solution? I’m afraid it’ll be tested as I’m not sure how to explain :/ anyone able to help ? Thank you!!
Explanation:
Ionic compounds do conduct electricity in aqueous or molten state but not in solid state. In solid state the ions are held together and they cannot move, so cannot conduct electricity. In molten or aqueous form the lattice breaks and ions are free to move so can conduct electricity.
I know this is so late. But anyone who comes across this type of a question, I hope this is helpful.
hi :) why must litmus paper be moistened to test for ammonia ?
Answer:
Ammonia is gas.
Explanation:
If not moistened, there will be no change in color of litmus paper. That is why littmus paper is being moistened before testing the pH of a gas.
Hope it helps.
Bromine water was added dropwise to test tubes containing aqueous solutions of bromide, chloride, and iodide. lodide was oxidized to iodine; bromide and chloride gave no reaction Arrange Br 2 ,Cl 2 ,I 2 in order of their strength as an oxidizing agent.
Answer:
Cl₂ > Br₂ > I₂
Explanation:
An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.
Oxidizing ability decreases down the group.
Therefore Cl₂ > Br₂ > I₂
One atomic model describes electrons moving in clouds around the nucleus.
How does this model fit into the history of atomic theory?
A. It was the first atomic model.
O B. It has been changed to show that electrons are scattered
throughout the nucleus.
O c. It has been changed to show that electrons travel in circular orbits
around the nucleus.
OD. It is the currently accepted atomic model.
Answer: D. It is the currently accepted atomic model.
Explanation:
It is the mordern atomic model, also known as the Electron Cloud Model. Indicating that the nucleus of an atom is surrounded by a cloud of electrons.
Answer:
Explanation:
d
HELP ME PLZ!!!! An artist follows this formula for making a special tricolored bracelet: 8 orange beads + 3 red beads + 4 green beads + 1 string → 1 bracelet How many special tricolored bracelets could be formed from 15 orange beads, 86 red beads, 92 green beads, and 17 pieces of string? 1 bracelet 10 bracelets 17 bracelets 23 bracelets
Answer:
1 bracelet.
Explanation:
For one bracelet: 8 orange, 3 red, 4 green, 1 string.
The artist has: 15 orange, 86 red, 92 green, 17 string.
No matter how much of the red and green beads she has, if she only has 15 pieces of orange beads, that will only allow her to make 1 bracelet.
Answer:
1 bracelet
Explanation:
8 orange beads + 3 red beads + 4 green beads + 1 string = 1 bracelet
15 orange beads + 86 red beads + 92 green beads + 17 string = ?
For 1 bracelet the artist needs 8 orange beads. To make two, the artist would need 16 orange beads, but the artist only has 15.
Therefore, the artist can only make 1 bracelet.
Could you guys help me with these questions pls. Thank you
Answer:
8.4) 27.1 cm³
8.5) 0.217 mol/dm³
Explanation:
Please see attached picture for full solution.
8.4) Since the results from titrations 3-5 are within 0.10cm³ from each other, these 3 results are concordant.
8.5) Find mol of sulfuric acid to find mol of NaOH using mole ratio. Equation has already been balanced for you, so mole ratio of NaOH to H2S04 is 2:1. To find concentration of NaOH, divide the number of moles by the volume in dm³ since the units for concentration is mol/dm³, which you can think of as the number of moles of NaOH in a dm³ of solution.
1 dm³ = 1000cm³
Thus, 1cm³= 1/1000 dm³
How did the change of stress (adding or removing reactants or products) cause a shift in the equilibrium system of your solutions? Use data to support your answer. Make sure you discuss all four stress changes: Adding a reactant Adding a product Removing a reactant Removing a product
Answer:
When reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. When a product is added, the equilibrium moves in order for reactants to reduce the stress.
Explanation:
:)
It should be noted that when a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product.
It should be noted that a reactant simply means a substance that takes part in a chemical reaction to form products.
When a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. Also, when a product is added, the equilibrium moves in order for reactants to reduce the stress. This is vital for the reaction.
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Which statement about acids is true?
a) Weak acids have a pH of less than 2.
b) The pH value of acids can only be measured in aqueous form.
c) The stronger the acid, the higher the pH value.
d) Strong acids have a low percent ionization.
Answer:
weak acids have a pH of less than 2
In the reaction Ca + Cl2 → CaCl2, what is the mole ratio of chlorine to calcium chloride?
Select one:
O a. 2:3
O b. 2:1
O c. 1:2
O d. 1:1
PLEASE HELP ME
Answer:
D. 1:1
Explanation:
For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).
So, the mole ratio of chlorine to calcium chloride is 1:1.
Hope this helps. :)
The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.
What is the stoichiometry?Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.
Given chemical reaction is:
Ca + Cl₂ → CaCl₂
From the stoichiometry of the given reaction it is clear that,
1 mole of chlorine = reacts with 1 mole of calcium chloride
So, mole ratio = Chlorine / calcium chloride = 1:1
Hence required mole ratio is 1:1.
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Write the net ionic equation describing the reaction between aluminum metal and Fe3+ ions in solution that produces dissolved Al3+ and Fe2+ ions. Be sure to include all states of matter.
Answer:
Al (s) + 3Fe3+ (aq) ---> Al3+ (aq) + 3Fe2+(aq)
Explanation:
atoms become positive (or less negative) ions when they lose electrons. They become negative (or less positive) ions when they gain electrons, since each electron (e-) has a charge of -1.
So, since Al changes to Al3+ which is positive, it loses electrons. And when Fe3+ changes to Fe2+, it becomes less positive, so it gained electrons.
Now, write the half (balanced) equations:
Al ---> Al3+ + 3e-
Fe3+ + e- ----> Fe2+
To combine both equations, we have to eliminate electrons. To do so, make sure both half equations have the same no. of electrons. We can multiply the equation of Fe by 3 so that it has 3 electrons.
3Fe3+ + 3e- ----> 3Fe2+
Finally, we can combine both equations (remember to eliminate the electrons).
Al (s) + 3Fe3+ (aq) ---> Al3+ (aq) + 3Fe2+(aq)
Check to see if both sides of the equation have equal charges. Ions always have an aqueous state.
In order from left to right, what are the coefficients (front numbers) needed to
balance the following equation? H2O2(aq) → H2O(1) + O2(g)*
Answer:
2H2O2 → 2H2O + O2
Explanation:
Florine is the most electronegative element on the periodic table. Explain why the element fluorine will not give up electrons when forming a chemical bond.
Answer:
Fluorine will not give up electrons when forming a chemical bond because since it is so electronegative, it pulls electrons from other elements closer to it. Fluorine also has seven valence electrons and needs just one electron to fill its outer shell and gain stability.
Hope this helps. :)
The information regarding the element fluorine is explained below:
The following information should be considered:
Fluorine should not give up electrons at the time when forming a chemical bond since it is so electronegative, it pulls electrons from other elements nearer to it. Fluorine also contains seven valence electrons and required just one electron to fill its outer shell and gain stability.Learn more:https://brainly.com/question/17429689?referrer=searchResults
You are conducting an
experiment on how increasing
pressure during a deep sea div
affects gases in the blood. Whi
unit would be appropriate for
your measurements?
A. Pascals
B. Centimeters cubed
C. Liters
D. Kelvin
Reset Selection
Answer:
A. Pascals
Explanation:
A unit Pascal is an SI unit used for internal pressure.
Centimeters cubed is volume.
Liters is measurement.
Kelvin is temperature.
Answer: A. Pascals
Explanation: Founders Educere answer
For each of the esters provided, identify the alcohol and the carboxylic acid that reacted.
52. Methyl propanoate+_________
53. Ethyl methanoate+__________
Answer:
52. The alcohol USED => methanol, CH3OH
The carboxylic acid USED => propanoic acid, CH3CH2COOH.
53. The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
Explanation:
52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:
CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O
The alcohol used: methanol, CH3OH
The carboxylic acid used: propanoic acid, CH3CH2COOH.
53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react
Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:
HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O
The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
Ionic compounds dissolved in water are better conductors of electricity than when they are in solid form. Why is this true?
Answer: In their bonded, solid states, molecules like salt don't conduct electricity. But when they're dissociated in a solution or through melting, they can carry a current. This is because electrons can't move freely through water (in the same way they do in a conductive wire), but ions can move freely
Explanation:
the sun is 73% hydrogen and 25% helium the rest is other elements what is the percentage of other elements in the sun
Answer:
12%
Explanation:
Which one has a greatest mass, one atom of carbon, one atom of hydrogen, or one atom of litium
Water exists as a simple molecule. Describe the bonding present in water and how the electrons are involved in these bonds.
The table lists the lattice energies of some compounds.
Compound
Lattice Energy (kJ/mol)
LiF –1,036
LiCl –853
NaF –923
KF –821
NaCl –786
Which statement about crystal lattice energy is best supported by the information in the table?
The lattice energy increases as cations get smaller, as shown by LiF and KF.
The lattice energy increases as the cations get larger, as shown by LiF and LiCl.
The lattice energy decreases as cations get smaller, as shown by NaCl and NaF.
The lattice energy decreases as the cations get smaller, as shown by NaF and KF.
Answer:
The lattice energy increases as cations get smaller, as shown by LiF and KF.
Explanation:
Lattice energy is the change in internal energy that accompanies the formation of one mole of the solid from its constituent gas phase ions at 0 K. In calculating the lattice energy, we assume an electrostatic model where the ions are regarded as point charges.
The size of the ions determines the magnitude of the lattice energy. If the anion is the same, then the magnitude of the lattice energy depends on the the size of the cation, the smaller the cation the greater the lattice energy.
Since Li^+ is smaller than K^+, it is expected that LiF will have a greater lattice energy than KF, hence the answer.
The statement about crystal lattice energy that is supported by the information in the table is A. The lattice energy increases as cations get smaller, as shown by LiF and KF.
It should be noted that lattice energy simply means the change in internal energy that occurs after the formation of one mole of the solid from its constituent gas phase ions.
The magnitude of the lattice energy is determined by the size of the ions. From the table, the lattice energy increases as cations get smaller, as shown by LiF and KF.
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Which statement is correct about the rate of a chemical reaction? A. It increases when the concentration of reactants increases. B. It does not depend on the concentration of reactants. C. It increases when the temperature decreases. D. It does not depend on the temperature.
Answer:
A) It increases when the concentration of a reactants increases.
Explanation:
I took the test :)
Answer:
Given the data, the correct statement is:
It increases when the concentration of reactants increases (option A)
What is rate of reaction?This is simply defined as the amount of reactants converted or the amount of products formed per unit time. It is expressed as
Rate = (change in reactant or product) / time
Factors affecting rates of reactionVarious factors tends to affect the rate of a chemical reaction. This includes
Temperature Concentration and pressure (for gases) Nature of reactants Surface Area of reactants Light CatalystWith the above information about reaction rates, we can conclude that the correct answer to the question is:
It increases when the concentration of reactants increases (option A)
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