Answer: No
Explanation:
A periodic table can be defined as the table in which the row of chemical elements are present. All the elements of the row have same number of electron shells.
The arrangement of elements is based on atomic numbers, electron shell model and other chemical properties. The elements are placed in increasing order of atomic number.
This table does not give information about the occurrence of the elements.
Describe what is happening in this chemical equation: Al2(SiO3)3 + NaOH → Na(SiO3)3 + Al2OH Please Help ASAP
WILL MARK BRAINLIEST AND GIVE 5 STARS.
Answer:
Double replacement reaction
Explanation:
This is what is known as a double replacement reaction. The two parts of each molecule separate and recombine to form two new compounds. For instance, [tex]Al_2(SiO_3)_3[/tex] separates into [tex]Al_2[/tex] and [tex](SiO_3)_3[/tex], while [tex]NaOH[/tex] separates into [tex]Na[/tex] and [tex]OH[/tex], and then they recombine with the other compound.
Hope this helps!
Answer:
double replacment reaction
Explanation:
srry if it is wrong
PLS HELP ! 5.00 mL of a stock solution, containing 0.200 M of Na3PO4 was pipetted into a 25.00 mL volumetric flask and made up to the calibration mark with deionised water. A serial dilution was carried out for another two times to obtain the final solution of desired concentration. Calculate the concentration of the final solution, express in ppm (by volume).
Answer:
262 ppm of Na₃PO₄
Explanation:
In a dilution, the concentration of the initial solution is decreased. When you take 5.00mL of the solution that is diluted to 25.0mL The solution is diluted 25/5 = 5 times
If you make another two serial dilutions the final solution wil decrease its concentration 5*5*5 = 125 times
As original solution containing 0.200 M of Na3PO4, the final solution will have a concentration of:
0.200M / 125 = 1.6x10⁻³M
Molarity is defined as the ratio between moles and liters. 1.6x10⁻³ moles of Na3PO4 in 1L are:
1.6x10⁻³mol ₓ (164g/mol) = 0.262g Na₃PO₄ / L
Assuming density of Na3PO4 as 1g/mL the concentration of the solution is:
0.262mL Na₃PO₄ / L
As 1mL = 1000μL:
262μL Na₃PO₄ / L
μL of solute per L of solution is equal to ppm, that means the solution has:
262 ppm of Na₃PO₄What is the symbol, atomic number, atomic mass, # of protons, # of neutrons, # of electrons, ion charge for the beryllium ion?
Answer:
Symbol Be
atomic number 4
protons 4
neutrons 5
electrons 4
ion charge +2
Explanation:
Look at the periodic table and all the answers can be found there. If you would like to learn how to find them please message me below.
Question 4 (higher question)
Electrolysis of acidified water can produce hydrogen and oxygen.
The apparatus for the electrolysis is:
. water containing some dilute sulfuric acid
• two graphite rods
• a suitable container for the electrolysis reaction
. a suitable source of electricity
• test tubes
Describe how to use the apparatus to electrolyse acidified water, and how to test the gases to
show that they are hydrogen and oxygen. Include a diagram in your answer. [6 marks]
Answer:
Explanation:
Describe means you should recall facts, events or processes accurately. You might need to give an account of what something looked like, or what happened.
Explain means you need to make something clear, or state the reasons for something happening.
Compare means you need to describe similarities and differences between things. If you are asked to compare X and Y, write down something about X and something about Y, and give a comparison. Do not just write about X only or Y only.
Evaluate means you must use information supplied, or your own knowledge, to consider the evidence for and against or to identify strengths and weaknesses. You must then complete your answer with a conclusion, stating which is better and why, for example.
5. Which contains more nitrogen: 60g of urea, (NH2)2CO, or 100g of ammonium sulphate, (NH4)2SO4
Answer:
Urea contains more nitrogen
Explanation:
1 mole of Urea contains 2 moles of Nitrogen and 1 mole of ammonium sulfate contains, also, 2 moles of nitrogen.
60g of urea (Molar mass: 60g/mol) contains:
60g × (1mol / 60g) = 1 mole. As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 2.
100g of ammonium sulfate (Molar mass: 132g/mol) contains:
100g × (1mol / 132g) = 0.758 moles.
As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 0.758×2 = 1.516 moles.
That means, urea contains more nitrogen.
The concentration of which ion is increased when LiOH is dissolved in water?
1.hydroxide ion
2.hydrogen ion
3hydronium ion
4.halide ion
Answer: (1) Hydroxide ion
Explanation: Because LiOH is a base hydroxide ion is OH-
The answer is hydroxide ion.
When the hydronium ion concentration of an aqueous solution is increased?
Using this equation, we find the pH of pure water to be 7. This is considered to be neutral on the pH scale. The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic.
How will the concentration of OH ions be affected when an excess weak base will be added to the concentrated HCL solution?When an excess base is dissolved in a solution of sodium hydroxide. Sodium hydroxide dissociates into OH- ions and when the number of OH- increases then concentration also increases because concentration is the number of OH- ions present per unit volume.
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Molar mass if calcium nitrate
Answer:
About 164 grams
Explanation:
The molecular formula of calcium nitrate is [tex]Ca(NO_3)_2[/tex]. The molar mass of calcium is about 40, while the molar mass of nitrogen is about 14 and oxygen is about 16. Therefore, the molar mass of it is:
[tex]40+2(14+3(16))=40+2(14+48)=40+124=164[/tex]
Hope this helps!
84. A salution of a substance x is used
of a
for
il Name the sulsstance 'x' and the
white kashing
write its farmula
il y Write the reaction the substance
la' named in il above with water.
of
dne
Answer:
Following are the answer to this question:
Explanation:
(1) Calcium oxide (CaO) is also referred to as quicklime. It is the solution for the substance used for whitewashing.
Whenever it reacts with water ([tex]H_2O[/tex]) and absorbs carbon dioxide ([tex]CO_2[/tex]), it then formed calcium carbonate ([tex]CaCO_3[/tex]), which produced a hard laminate on the walls, to first be whitened by the production of calcium hydroxide (CaOH).
(2) Slackened lime or calcium hydroxide arises whenever the fast limestone reacts with water.
[tex]CaO(s) + H_2O(l) \rightarrow Ca(OH)_2(aq).[/tex]
If a substance changes its shape and size, is it a physical or chemical change? - chemical - physical - both
Which phrase describes the prime meridian
Answer:
It is a metaphorical line that divides the earth from north to south
Explanation:
In this reaction, how many grams of O2 are required to completely react with 110 grams of Al
Answer:
98 g
Explanation:
Start with the balanced equation. Then, make a little chart under the equation showing the information you have and need.
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M ___ ____
n ___ <= ____
"m" is for mass. "M" is for molar mass (some teachers use "MM"). "n" is for the number of moles.
To find the mass of oxygen:
Calculate the molar mass of oxygen ([tex]M_{O_{2}[/tex])Calculate molar mass of aluminum ([tex]M_{Al}[/tex])Use [tex]M_{Al}[/tex] to find the moles of aluminum ([tex]n_{Al}[/tex])With [tex]n_{Al}[/tex], use the mole ratio to find the moles of oxygen ([tex]n_{O_{2}}[/tex])Use [tex]n_{O_{2}}[/tex] and [tex]M_{O_{2}}[/tex] to find the mass of oxygen ([tex]m_{O_{2}}[/tex])To find molar mass, use the atomic mass on your periodic table. For each atom of an element, add on its atomic mass.
Molar mass of aluminum (one Al atom):
[tex]M_{Al} = 26.982 g/mol[/tex]
Molar mass of oxygen (two O atoms):
[tex]M_{O_{2}} = 16.000g/mol+16.000g/mol[/tex]
[tex]= 32.000g/mol[/tex]
Update the chart:
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M 32.000 g/mol 26.982 g/mol
n ___ <= ____
Find the moles of aluminum
[tex]n_{Al} = \frac{110g}{1} *\frac{1mol}{26.982g}[/tex] Multiply mass by molar mass to find moles.
[tex]n_{Al} = \frac{110}{1} *\frac{1mol}{26.982}[/tex] The units "g" cancel out.
[tex]n_{Al} = 4.0(7)mol[/tex] Keep one extra significant figure. (110 has 2 sig. figs.)
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M 32.000 g/mol 26.982 g/mol
n ___ <= 4.0(7) mol
Find the moles of oxygen using the mole ratio, which comes from the coefficients in the balanced equation.
The mole ratio of oxygen to aluminum is 3 to 4.
[tex]n_{O_{2}} = \frac{4.0(7)mol_{Al}}{1}*\frac{3mol_{O2}}{4mol_{Al}}[/tex] Multiply moles of aluminum by the mole ratio.
[tex]n_{O_{2}} = \frac{4.0(7)}{1}*\frac{3mol_{O2}}{4}[/tex] "molAl" units cancel out.
[tex]n_{O_{2}} = 3.0(52)mol_{O2}[/tex] Keep two sig. figs. when the first is a "5"
3O₂(g) + 4Al(s) → 2Al₂O₃(s)
m ? 110 g
M 32.000 g/mol 26.982 g/mol
n 3.0(52) mol <= 4.0(7) mol
Find the mass of oxygen
[tex]m_{O_{2}} = \frac{3.0(52)mol}{1}*\frac{32.000g}{1mol}[/tex] Multiply moles by molar mass.
[tex]m_{O_{2}} = \frac{3.0(52)}{1}*\frac{32.000g}{1}[/tex] The "mol" unit cancels out.
[tex]m_{O_{2}} = 97.(6)g[/tex] Keep one sig. fig. to round. "6" rounds up.
[tex]m_{O_{2}} = 98g[/tex] <= Final answer
∴ 98 grams of oxygen are required to completely react with 110 grams of aluminum.
Keeping in mind the rules for significant dig-
its, what is the product of 0.6906 m and 4.03
m?
Answer:
2.78
Explanation:
When multiplying, your answer will have the same amount of sig figs as the multicand or multiplier that has the lower number of sig figs. In this case, 4.03 is the one with the lowest number of sigs figs, which is 3 sig figs, so the answer should have 3 sig figs, so the answer is 2.78.
so ...this is the question and I hope you get it right one
Answer:
About 96 grams per mole
Explanation:
The chemical formula of ammonium carbonate is [tex](NH_4)_2CO_3[/tex]. This means that breakdown of moles of atom per mole of molecule is:
2 moles of nitrogen, with a molar mass of around 14
8 moles of hydrogen, with a molar mass of around 1
1 mole of carbon, with a molar mass of about 12
3 moles of oxygen, with a molar mass of about 16
The molar mass of ammonium carbonate is therefore:
2(14)+8(1)+1(12)+3(16)=28+8+12+48=about 96
Hope this helps!
) Based on your observations, what conclusion can you draw about the factors affecting the ability of an enzyme?
Answer:
Explanation:
Enzyme activity is affected by the increase in temperature.
enzyme activity is also affected by the change in ph.
enzyme activity is also affected when substrate concentration is not increased in a chemical reaction.
Based on your observations, enzyme activity is affected by the increase in temperature.Enzyme activity is also affected by the change in pH.
What are observations?
Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.
It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.
It is important to note down observations so that the testing of hypothesis is made easier.There are four types of observations .Observations need to be descriptive and must be written in complete sentences and should include all the numerical data of the experiment.
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If 119.5 g of iron is mixed with 279.50 g of copper (II) nitrate, what is the limiting reagent for the reaction?
Answer:
Copper ii nitrate is the limiting reagent
Explanation:
The first thing to write here is the equation of reaction;
Fe + Cu(NO3)2 ——> Fe(NO3)2 + Cu
When we talk of limiting reagent, we mean the reactant that is totally consumed upon the completion of the chemical reaction
To get the limiting reagent, we can know this by calculating the mass of a specific product formed from each of the masses of the reactants
Now, we can use the amount of copper solid deposited by each of the reactants to know the limiting reagent here.
Since the mole ratio in all cases is 1 to 1, this will be easy
For the iron, the number of moles reacted is mass of iron/ atomic mass of iron
That would be 119.5/56 = 2.134 moles
Now since the mole ratio is 1 to 1, 2.134 moles of copper will be formed
Thus, the mass of copper produced from the iron will be number of moles * atomic mass of copper = 2.134 * 64 = 136.57g
Now from the nitrate, the number of moles is
mass mixed/ molar mass of copper nitrate
molar mass of copper nitrate is 188g/mol
number of moles is thus 279.5/188 = 1.487 moles
Since the mole ratio is 1 to 1, it means that the number of moles of copper produced too is 1.487 moles
The mass of copper produced from this is number of moles of copper * atomic mass of copper
That will be 1.487 * 64 = 95.15g
Now, since the copper nitrate produces less amount of copper solid, it is the the reagent to be consumed first and thus it is our limiting reagent
Consider the equation below. CaCO3(S) CaO(S) + CO2(g) What is the equilibrium constant expression for the given reaction?
Answer:
Option B. Keq = [CO2] [CaO]/ [CaCO3]
Explanation:
The balanced equation for the reaction is given below:
CaCO3(s) —> CaO(s) + CO2(g)
The expression for the equilibrium constant, Keq is simply the ratio of the concentration of the products to that of the reactants.
The expression for the equilibrium constant, Keq is given below:
Keq = [CO2] [CaO] / [CaCO3]
Answer: c) Keq= [co2]
Explanation:
edge 2023
5. What volume would you need to dilute 0.2 L of a 15 M solution to obtain a 3 M
solution?
Answer:
IL
Explanation:
M_1 V_1 = M_2 V_2
M_1 = 15 M
V_1 = 0.2 L
M_2 = 3 M
V_2 = ?
15 x 0.2 = 3V_2
15 x 0.2 = 3
3 / 3V_2
1 L= V_2
1 L is the volume that would be needed to dilute 0.2 L of a 15 M solution to obtain a 3 M solution.
What is volume?A measurement of three-dimensional space is volume. It is frequently expressed quantitatively in SI-derived units, other imperial units, or US customary units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the overall size of a container is typically thought of as its capacity, or the quantity of fluid it could hold.
Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes.
Molarity₁×Volume₁=Molarity₂×Volume₂
15 x 0.2 = 3×Volume₂
15 x 0.2 = 3
3 / 3=Volume₂
1 L=Volume₂
Therefore, 1 L is the volume that would be needed to dilute 0.2 L of a 15 M solution to obtain a 3 M solution.
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Name two drying agents that can be use to dry hydrogen gas
Which statement best describes a solution containing a strong base?
A. the solution is dilute
B. The solution is concentrated
C. a small amount of the base dissociates in solution
D nearly all of the base dissociates in solution
How many neutrons are in one atom of the elemen, F-19?
Answer:
10
Explanation:
Answer: 10 neutrons
This isotope of fluorine has 9 protons, 9 electrons and 10 neutrons.
Explanation:
Determine the pH of 0.150 M magnesium hydroxide solution
PLEASE HURRRYYYY
A buffer is made using HCO2Na. Which other substance should the buffer contain?
HCO2Li
HCO2H
NaNO3
HCl
Answer:
HCO₂H
Explanation:
A buffer is defined as the mixture between a weak acid and its conjugate base, or vice versa, in an aqueous solution.
The HCO₂Na (Sodium formate), is the conjugate base of formic acid, HCO₂H, a weak acid of pKa = 3.75.
Thus, to make a buffer using HCO₂Na, the other substance the buffer should contain is HCO₂H
Answer:
HCO₂H
Explanation:
A battery has an electrical ______________ energy
Answer:
Electrical Energy
Explanation:
There are a variety of chemical and mechanical devices that are called batteries, although they operate on different physical principles. A battery for the purposes of this explanation will be a device that can store energy in a chemical form and convert that stored chemical energy into electrical energy when needed.
Consider the reaction below.
Zn(s) + Cu2+ (aq)--->Zn2+ (aq) + Cu(s)
Which half reaction correctly describes the oxidation that is taking place?
A)Zn(s)--->Zn2+ (aq) +e
B)Zn(s)--->Zn2+ (aq) + 2e-
C)Cu2+ (aq) + 2e--->Cu(s)
D)Cu2+ (aq)e Cuis)
Answer:
B
Explanation:
Oxidation
Zn---> Zn2+ 2e
Reduction
Cu2+ + 2e ---->Cu
What type of mixture scatters light and cannot be filtered easily?
Answer:
a colloid (heterogeneous mixture) that dispearses the particles intermediate in size.
particle size...1 to 10000nm, disperse, large molecules or aggregatesdoes not seperate on standingcannot be seperated by filtrationscatter light (Tyndall effect)Explanation:
What is the dependent variable for "how does changing your laundry detergent affect how clean your clothes are?"
Dependent variables receive this name because, in an experiment, their values are studied under the supposition. The dependent variable is the cleanliness of the clothes.
What is the dependent variable ?It is something on which other elements depend. A test score, for instance, may be a dependent variable because it could vary based on a number of variables, including how much you studied, how much sleep you got the night before the test, and even how hungry you were.
A dependent variable is one that is altered as a result of the modification of an independent variable. Your independent variable "depends" on the outcome you're interested in measuring. Dependent variables are also referred to as: response elements (they respond to a change in another variable)
There are often two different sorts of variables in analytical health research. We anticipate that independent variables will have an impact on dependent variables.
Thus,The dependent variable is the cleanliness of the clothes.
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give chemical tests to distinguish between saturated and unsaturated compound
bromine is used to distinguish between saturated and unsaturated compounds. when bromine water is added to the unsaturated compound, bromine that added to the unsaturated compound and the red brown colour of bromine water is discharged.
Unit Test
Active
TIME REMAINING
1
2
01:55:24
Which statement best describes the direction of heat flow by conduction between two samples of the same material?
Heat flows from faster molecules to slower molecules when they are near.
Heat flows from faster molecules to slower molecules when they collide.
Heat flows from slower molecules to faster molecules when they are near.
Heat flows from slower molecules to faster molecules when they collide.
Answer:
b
Explanation:
edge 2021
According to the concept of conduction,heat flows from faster molecules to slower molecules when they collide.
Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules .
There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
Heat is transferred from faster to slower molecules when they collide , thus the correct option is that heat flows from faster molecules to slower molecules when they collide.
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Using the periodic table, complete the table to describe each atom. Type in your answers. A B C D E F
Answer:
e
Explanation:
Answer:
A 20
B 40
C Ca
D 10
E 9
F F
Explanation:
Which particle has no charge
Answer:
Neutron
Explanation: