Answers
Answer:
3
Explanation:
Related Questions
Anna is conducting an experiment to determine how weather affects cell phone reception. She is trying to decide the best way to conduct her experiment in order to collect meaningful data.
Answers
The question is incomplete, the complete question is;
Anna is conducting an experiment to determine how weather affects cell phone reception. She is trying to decide the best way to conduct her experiment in order to collect meaningful data. Which of the following experiments would help Anna collect the best data? A. Test different cell phones in different locations on days with clear weather. B. Test different cell phones in different locations on days with rainy weather. C. Test a cell phone's reception in one location with clear weather and in another location with rainy weather. D. Test a cell phone's reception in the exact same location under various atmospheric conditions.
Answer:
D. Test a cell phone's reception in the exact same location under various atmospheric conditions.
Explanation:
In this experiment that Anna intends to carry out, the independent variable is the atmospheric condition. The dependent variable must be the cell phone reception, it is expected to change with atmospheric conditions.
In order to obtain valid results, other factors such as such as type of cellphone and location (control variables) must be held constant so as to collect the best data.
In order to become stable, Potassium, K, will _______ and have a resulting charge of _____.
A)gain an electron, +1
B)gain 7 electrons, +7
C)lose an electron , +1
D)gain 7 electrons, -7
Answers
Answer:
D
Explanation:
it doesn't matter how many protons k has all the answers have electron with the positive charge when is negative the question is trying to distract you D is the only one that would use the electrons sign correctly
Fill in the coefficients that will balance the following reaction: (Note: Use 1 as coefficient where appropriate.) C3H7OH+O2-- CO2 +H2O
Answers
The balanced equation :
2C₃H₇OH+9O₂⇒ 6CO₂ +8H₂O
Further explanationGiven
The following reaction(combustion of Propanol) :
C₃H₇OH+O₂⇒ CO₂ +H₂O
Required
Balanced equation
Solution
Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
• 1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.
• 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product
• 3. Select the coefficient of the substance with the most complex chemical formula equal to 1
1. Give coefficient
C₃H₇OH+aO₂⇒ bCO₂ +cH₂O
2. Make an equation
C, left=3, right=b⇒b=3
H, left=8, right=2c⇒2c=8⇒c=4
O, left=1+2a, right=2b+c⇒1+2a=2b+c⇒1+2a=2.3+4⇒1+2a=10⇒2a=9⇒a=9/2
The equation becomes
C₃H₇OH+9/2O₂⇒ 3CO₂ +4H₂O x 2
2C₃H₇OH+9O₂⇒ 6CO₂ +8H₂O
Na2S2O3 + AgBr NaBr + Na3ſAg(S203)2] What is
the mass of NaBr that will be produced from 42.7 g of AgBr?
Answers
Answer:
Mass of NaBr produced = 23.67 g
Explanation:
Given data:
Mass of AgBr = 42.7 g
Mass of NaBr produced = ?
Solution:
Chemical equation:
2Na₂S₂O₃ + AgBr → NaBr + Na₃(Ag(S₂O₃)₂
Number of moles of AgBr:
Number of moles = mass/molar mass
Number of moles = 42.7 g/ 187.7 g/mol
Number of moles = 0.23 mol
now we will compare the moles of AgBr with NaBr.
AgBr : NaBr
1 : 1
0.23 : 0.23
Mass of NaBr:
Mass = number of moles × molar mass
Mass = 0.23 mol × 102.89 g/mol
Mass = 23.67 g
9.
How would your mass and weight differ on the moon? (The gravitational force on the
moon is 1/6 the force on Earth).-
Answers
Answer: Your mass would be the same, but you would weigh less because the gravity on the moon is less than it is on Earth.
Explanation:
Why does oxygen have stronger attractive forces between its nucleus and valence electrons than nitrogen?
Answers
If hydrochloric acid has a [H+] of 1.2 x 10-2 M, what is the pH?
1.9
0 1
1.2
O
8
Answers
Answer:
1.9Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]pH = - log(1.2 \times {10}^{ - 2} ) \\ = 1.920818...[/tex]
We have the final answer as
1.9Hope this helps you
Answer:
1.9
Explanation:
How many electrons does an atom have if the mass number is 31 and the number of neutrons is 16?
Answers
Answer:
I'm pretty sure it's 15 electrons. Hope this helps :).
Explanation:
help me pleaseeee, if you do tyy :)
Answers
in one molecule we have one oxygen atom so we will have 4 oxygen atoms in 4 molecules
A sample of 2.00 moles of oxygen at 45°C and 98.6 kPa occupies what volume?
Answers
Answer:
V = 53.83 L
Explanation:
Given data:
Number of moles = 2.00 mol
Temperature = 45°C (45+273 = 318 K)
Pressure = 98.6 KPa (98.6/101 = 0.97 atm)
Volume of gas = ?
Solution:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
0.97 atm × V = 2.00 mol × 0.0821 atm.L/mol. K × 318 K
V = 52.22 atm.L/0.97 atm
V = 53.83 L
the Central value of the set of observation is called.
Answers
Answer:
The central value of the sets of observation can be mean, median or mode depending upon the kind of data provided as all are measure of central tendency.
Explanation:
About Salva Chapter 14
1.Why isn’t Nya happy when the borehole water starts flowing?
2.How much time has now passed since Salva fled from his school?
3.What was life like in the Kakuma and Ifo refugee camps?How did they compare?
4.What does Salva mean when he thinks,”It was hard to keep hope alive when there was so little to feed it?”
5.Where does Salva finally find this hope?
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Answer:
Because it is muddy and dirty.9 yearsDreadful / Compared The Ifo and Kakuma camps: Isolated areasThere was no way Salva could ever reach his goal of branching out into the world if he was stuck at the camp.When he hears that 3000 boys will be chosen to go to America.What happens to brain cells when we sleep?
Answers
Answer:
What happens is...
Explanation:
Specifically, it allows your neurons, or nerve cells, to reorganize. When you sleep, your brain's glymphatic (waste clearance) system clears out waste from the central nervous system. It removes toxic byproducts from your brain, which build up throughout the day. This allows your brain to work well when you wake up.
Consider the reaction H2O(g)+Cl2O(g)=2HClO(g). At equilibrium,the concentrations of the different species:[H2O]=0.077M,[Cl2O]=0.077M,[HClO]=0.023M. What is the equilibrium constant for the reaction at this temperature?
Choices: 0.089, 0.26, 3.9, or 11
Answers
The equilibrium constant K : 0.089
Further explanationGiven
Reaction
H₂O(g)+Cl₂O(g)⇔2HClO(g)
[H2O]=0.077M,[Cl2O]=0.077M,[HClO]=0.023M
Required
the equilibrium constant
Solution
The equilibrium constant or Kc is the value of the concentration product in the equilibrium state of the substance in the right segment divided by the product of the substance in the left section, each of which has a reaction coefficient raised
[tex]\tt K=\dfrac{[HClO]^2}{[H_2O][Cl_2O]}\\\\K=\dfrac{0.023^2}{0.077\times 0.077}\\\\K=0.08922[/tex]
A student was tasked with experimentally determining the mole ratio of strontium chlorate hexahydrate. The students data follows below. Determine the experimental molar ratio for strontium chlorate hexahydrate to proper significant figures (4) based on the data below. Calculate the students percent error.
Mass of clean dry crucible – 21.05 g
mass of crucible and sample – 23.36 g
mass of crucible & sample after heating – 22.49 g
Answers
The pH scale measures ___.
A. The concentration of hydrogen ions
B. The strength of solutions from 1 to 12
C. The concentration of bases
D. The concentration of acids
Answers
Answer:
a
Explanation:
it is the concentration of the hydrogen ion, more hydrogen ion more acidic less hydrogen ion less acidic and alkaline.
ine element and compound with example.
What is symbol? Write its significance.
Define mixture. Write its types.
Write the difference between mixture and compound.
What is a chemical equation? What are the essentials of
chemical equation? What information is conveyed by
chemical equation? What are its limitations and how are they
removed?
What do you understand by balancing of a chemical equation
Why 'partial equation method' is considered to be better than
"hit and trial method'?
What information is
Answers
Explanation:
an element is a substance which cannot be spilt upto two or more simple substances.For eg gold,silvera compound is the substance produced by the union of two or more elements in a definite proportion by weight .For eg water,carbon dioxideI dont knowA mixture is a substance formed by mixing two or more elements are compounds in any proportion by mass .Its types are:Hetregeneous mixture and homogeneous mixture.the difference between mixture and compound is that a mixture is a substance formed by mixing two or more elements are compounds in any proportion by maths and compound is a substance produced by the union of two or more elements in a definite proportion by weight.chemical equation is defined as the symbolic representation of a chemical reactionAccording to Valence Shell Electron Pair Repulsion (VSEPR) theory, which statement is correct? If a molecule has four pairs of electrons, it will always have a tetrahedral structure. If a molecule is made up of three atoms, it will always have a linear structure. If a molecule is bent, it will always have unpaired electrons around the central atom. If a molecule has three atoms around a central atom, it will always be trigonal planar.
Answers
Answer: Option 1
Explanation: hopes it helps
Valence Shell Electron Pair Repulsion (VSEPR) theory is employed in prophesying the geometrical organisation of the specific molecule with the aid of electron sets found encompassing the atom.
The correct answer is:
Option A. If a molecule has four pairs of electrons, it will always have a tetrahedral structure.
This can be explained as:
To reduce the electron repellence atom having four pairs of electrons will always accommodate to a tetrahedral structure.An atom comprising four pairs of electrons will have no lone pairs and hence, tetrahedral geometry.An example of tetrahedral geometry is methane (CH4).Therefore atom containing four pairs of electrons will have a tetrahedral shape.
To learn more about VSEPR theory follow the link:
https://brainly.com/question/12775505
the term pH was discovered by which scientist
Answers
Answer:
Such was the case with the concept of pH, introduced in 1909 by Søren Sørensen as a convenient way of expressing acidity—the negative logarithm of hydrogen ion concentration.Jan 8, 2018
Profession: Chemist
Can someone please help me and explain how to do this :')
How many moles of O₂ are needed to produce 3.17 mol of carbon monoxide from it's elements by a synthesis reaction?
Answers
Answer:
this is the answer explanation of previous question. as what you say in comment i do that
what information does a chemical equation contain
Answers
Answer:
Chemicals should involve information about properties and reactants.
Describe two ways the material in illustrates the importance of creativity in scientific investigations
Answers
Answer:
J.J Thompson make use of creativity to explain cathode ray tube experiment.
Also, creativity was used by Daltons to explain Joseph Proust's work.
Explanation:
This problem is all about the the beginning part of chemistry that is the atomic theory. The atomic theory was starts from the time of people like Democritus and down to people like J.J Thompson and John Dalton. Although it has been registered and credited that Dalton is the father of atomic theory many people has also worked on it before him for instance person like Joseph Proust. The reason behind this because some works that has been done by other people such as Democritus[who was the first person to start atomic studies] does not have any scientific evidence.
Creativity is needed when it concerns scientific research and investigation. This is what scientists such as John Daltons and J.J Thompson have used. J.J Thompson make use of creativity to explain cathode ray tube experiment. Also, creativity was used by Daltons to explain Joseph Proust's work.
Write out the chemical equations showing how a buffer solution made from H2PO4- and HPO42- would react to the addition of an acid (H+ ions) or a base (OH- ions).
Answers
Answer:
kindly check the explanation section.
Explanation:
The two ions given in the question above that is Dihydrogenphosphate, H2PO4- and HPO42- are so important when it concerns buffering. During intracellular pH balancing the ions that is H2PO4- and HPO42- reacts with OH⁻ and H⁺ respectively. The equation for the chemical reaction is given below for both ions.
H₂PO₄⁻ + OH⁻ < =====================================> HPO₄²⁻ + H₂O.
HPO₄²⁻ + H⁺ <===========================================> H₂PO₄⁻.
which metal can be obtain from calvertie ores?
Answers
Answer:
Ore
hope this helps
thanks for the points
a)Calculate the mass of NaNO3 that heated strongly and produced 4.5 dm3(cubic decimeter) of O2 gas.
The chemical equation for a chemical reaction is given below (2)
2NaNO3 ---> 2NaNO2 +O2
b) Calculate the concentration of HCl solution formed by dissolving 200 g HCl in 300 CM3 of water.(2)
Answers
Answer:
a) 34 g
b) 18.33 moldm^-3
Explanation:
a) The equation of the reaction is;
2NaNO3----------> 2NaNO2 + O2
Let us recall that 1 mole of a gas occupies 22.4 dm^3. Since 1 mole of O2 is produced in the reaction, we can write;
2 moles of NaNO3 yields 22.4 dm^3 of O2
x moles of O2 yields 4.5 dm^3 of O2
x = 2 * 4.5/22.4
x = 0.4 moles of NaNO3
But number of moles = mass/molar mass
molar mass of NaNO3 = 85 g/mol
Mass of NaNO3 = 0.4 moles * 85 g/mol
Mass of NaNO3 = 34 g
b)
Number of moles in 200g of HCl = mass/molar mass
molar mass of HCl = 36.5 g/mol
Number of moles = 200g/36.5 = 5.5 moles
From;
Number of moles = concentration * volume in dm^3
concentration = Number of moles/ volume in dm^3
But volume = 300 cm^3 or 0.3 dm^3
concentration = 5.5/0.3 = 18.33 moldm^-3
What is the correct order of the scientists in order of their work related to the structure of an atom from earliest to most recent?
Neils Bohr, Ernest Rutherford, JJ Thomson, John Dalton, Democritus and Erwin Schrodinger
Erwin Schrodinger, JJ Thomson, John Dalton, Neils Bohr, Ernest Rutherford and Democritus
Democritus, John Dalton, JJ Thomson, Ernest Rutherford, Neils Bohr and Erwin Schrodinger
John Dalton, Neils Bohr, JJ Thomson, Democritus, and Ernest Rutherford and Erwin Schrodinger
PLEASE HELP !!!
Answers
Answer:
C. democritusm John dalton, JJ Thomason, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.
The correct order of the scientists in order of their work related to the
structure of an atom from earliest to most recent include Democritus, John
Dalton, JJ Thomson, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.
Democritus was regarded as one of the earliest scientist who first proposed
atomic theory around 460 BC which was then modified and used by others
such as John Dalton, JJ Thomson, Ernest Rutherford and Neils Bohr.
The most recent of them all was Erwin Schrodinger which was the wave
equation for electron movements in the 20th century.
Read more on https://brainly.com/question/20339664
Would this be point D or point E? (Picture)
Answers
help me pleaseeee, ty if you doo :))
Answers
List six elements with only 1 electron in an s orbital
Answers
Answer:
[tex]Lithium=Li2s^1\\Sodium=Na3s^1\\Potassium=K4s^1\\Rubidium=Rb5s^1\\Cesium=Cs6s^1\\Francium=Fr7s^1[/tex]
Explanation:
When it comes to electron configuration and orbitals, it's important to first identify what exactly we are trying to identify. Below is a given example:
[tex]He1s^2[/tex]
[tex]He=element[/tex]
[tex]1=level[/tex]
[tex]s=orbital[/tex]
[tex](exponent)^2=electrons[/tex]
Looking at the periodic table, identify the alkali metal family on the periodic table, or group one elements:
[tex]Lithium=Li2s^1\\Sodium=Na3s^1\\Potassium=K4s^1\\Rubidium=Rb5s^1\\Cesium=Cs6s^1\\Francium=Fr7s^1[/tex]
Notice how each configuration has an exponent of [tex]1[/tex], representative of a single electron in their s-orbital.
How is Zinc chloride formed in the lab and please tell the steps
Answers
Answer:
When zinc metal is reacted with hydrochloric acid, hydrogen gas is released and an aqueous solution of zinc chloride is produced. ... It is important that all of the zinc used be reacted and that large excess amounts of hydrochloric acid not be used.
Anhydrous zinc chloride is synthesized by treating zinc with hydrogen chloride. Whereas, hydrated and aqueous forms of zinc chloride are prepared by treating zinc with hydrochloric acid. Zinc metal could either be in the form of zinc sulfide or zinc oxide
Have a nice Day , Hope this helped you I would appreciate it if you could mark my answer brainliest
Merry Christmas
Answer: Anhydrous zinc chloride is synthesized by treating zinc with hydrogen chloride. ... Zinc metal could either be in the form of zinc sulfide or zinc oxide. ZnS(s) + 2 HCl(aq) → ZnCl2(aq) + H2S(g) There are impurities present in zinc chloride samples due to hydrolysis.
got this from goo.gle
Hope this helps.......... Stay safe and have a Merry Christmas!!!!! :D