Answer:
9.93 × 10²³ atomsExplanation:
The number of atoms of potassium can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 1.65 × 6.02 × 10²³
We have the final answer as
9.93 × 10²³ atomsHope this helps you
Boron- 11
Atomic #
Atomic mass
# of protons
# of neutrons
# of electrons
Answer: 5 protons 6 neutrons and 5 electrons. and atomic number is 5.
Hope this helps!
A student would like to test the effect of eating a lot of candy on
student hyperactivity. She sets up two groups for her experiment and
measures her results in the number of times a student jumps out of their
seat. What is the independent variable?
Answer:
Number of candies
Explanation:
The independent variable in this experiment is the number of candies eaten by the student.
An independent variable is best pictured as the cause in an experiment. It is the reason why the effects in experiments are produced.
In this experiment, the hyperactivity is the hyperactivity is the dependent variable. It is the effect that is produced in this set up.
Answer:
Just to make it short, its eating a lot of candy
Explanation:
Which of the following best describes the Valence Shell Electron Pair Repulsion Theory (VSEPR)?
Answer:
Electron pairs are arranged as far apart from each other as possible.
Explanation:
Like charges repel therefore, VSEPR theory is the "...repulsions between electron pairs present in the valence shell of the central atom."
What types of atoms typically form covalent bonds?
A. Metals with nonmetals, because their difference in electronegativity is above 1.7.
B.Metals with nonmetals, because their difference in electronegativity is below 1.7.
C.Nonmetals with nonmetals, because their difference in electronegativity is above 1.7.
D.Nonmetals with nonmetals, because their difference in electronegativity is below 1.7.
3. As a ray of white light passes through a prism, dispersion occurs. Which among the color of
the visible spectrum refracted the MOST?
C. Green
A. Yellow
B. Red
D. Violet
Your answer is option b
i.e. Red
because refractive index of red is more as compared to green, yellow and violet...
1. What is the electron configuration for zirconium?
1s 2s 2p 3s 3p 3d 10 452 4p 532 44?
132 232 2p 3s 3p 432 3410 4p6 552 44²
O 132 232 2p 3s 3p 3040 4p 58% 42%
O 1:2 232 2p 3s 3p 452 300 dp" 4d?
Answer:
nose Inglés
bssnsnnsnsnsnsnsks
Answer: I think its the first won
Explanation:
(copped and pasted from website)
Zirconium
Electronic configuration
1s22s22p63s23p63d104s24p64d25s2
1. Lauri conducts an experiment to investigate how the mass of a catalyst, manganese (IV) oxide, affects the rate of production of oxygen during the decomposition of hydrogen peroxide (H2O2). Water and heat are also produced during the decomposition.
(a) (i) Name TWO factors OTHER THAN a catalyst, which can affect the rate of a chemical reaction. (2mks)
(ii) Write a balanced equation to show the decomposition of hydrogen peroxide by manganese (IV) oxide, MnO2(s) (2mks)
a)(I)the concentration of the reactants
the temperature
ii)
Classify the triangle based on the side lengths 9, 40, and 41
Answer:
That's a right Triangle
Explanation:
algebra.com
Answer:
scalene triangle
Explanation:
Scalene triangles don't have any equal side lengths.
What is the ionic charge of elements in column 1?
Every element in the first column varieties a cation with charge 1+. Every component in the 2d column varieties a cation with charge 2+. Elements in the third to remaining column nearly all shape an anion with a 2- charge and factors dwelling in the 2d to closing column nearly all structure anions with a 1- charge.
A sample of which element could have a volume of 1.5 cubic centimeters (cm3) and a mass of 7.5 grams (g)?
Answer:
5 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{7.5}{1.5} \\ [/tex]
We have the final answer as
5 g/cm³Hope this helps you
I GIVE BRAINLIEST TO WHO EVER GETS IT RIGHT!
which two scientist proposed an atomic model with a nucleus?
A.) Thomson
B.) Bohr
C.) Dalton
D.) Rutherford
Answer: B. Bohr and D. Rutherford
Identify the major force between molecules of pentane and hexane
Answer:
induced-dipole induced dipole forces.
Explanation:
how many equivalent statements are needed to convert 23.4 Gm into mm? 20 points!
Answer:
23.4 x 10¹²mm
Explanation:
Given problem;
Convert Gm to mm;
Gm = Gigameters
mm = millimeters
1 Gigameter = 1 x 10⁹m
1000mm = 1 m
To convert from Gm to mm;
23.4 Gm x [tex]\frac{1 x 10^{9} m}{1Gm}[/tex] x [tex]\frac{1000mm}{1m}[/tex] = 23.4 x 1 x 10⁹ x 10³ =
= 23.4 x 10¹²mm
10. calcium fluoride ca
11. sodium nitride
12. magnesium chloride
In formulas
Answer:
10=CaF2
11=Na3N
12=MgCl2
Explanation:
Answer:
10. CaF2
11. Na3N
12. MgCl2
Explanation:
Which of these elements is the most chemically reactive?
A zinc (Zn)
B. iron (Fe)
C. potassium (K)
D. germanium (Ge)
Answer:
a zinc is the most reactive
In the cell, amino acid molecules combine to form
Answer:
A polypeptide chain!
Explanation:
Hopefully this helps! If this wasn't the answer you were looking for please don't hesitate to comment here or private message me! Have a nice day/night! :))
Amino acids are the fundamental building blocks of proteins. In the cell, amino acid molecules combine to form polypeptide chain or protein.
What are amino acid ?The term amino acids are defined as the building block of the protein. Amino acids are the fundamental building blocks of proteins. Their molecule contains both an amino and a carboxylic group.
Alpha-amino acids are amino acids that have an amino and a carboxyl group attached to the same carbon atom, i.e., an alpha-carbon atom. Glycine, Alanine, etc.
Proteins are made up of monomers called amino acids. A protein is composed of one or more linear chains of amino acids, each of which is referred to as a polypeptide.
Thus, In the cell, amino acid molecules combine to form polypeptide chain or protein.
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Brian is making a cake for his friend's birthday. He combines the ingredients for the cake and then pours the batter into two pans and bakes them for 45 minutes in the oven. While the pans are in the oven, he combines butter, sugar, and milk and mixes them together to make the icing. What type of changes created the cake and the icing?
A. Both the icing and the cake are formed by physical changes.
B. Both the icing and the cake are formed by chemical changes.
C. The icing is formed by a chemical change and the cake is formed by a physical change.
D. The cake is formed by a chemical change and the icing is formed by a physical change.
Answer:
it’s D.The cake is formed by a chemical change and the icing is formed by a physical change
Explanation:
It’s because when the cake was baking there was nothing physical about it so it was a chemical change the icing is formed by a physical change because all you did was mix three ingredients together
The type of changes that created the cake and the icing is;
Option D; The cake is formed by a chemical change and the icing is formed by a physical change.
This is about understanding type of changes in chemistry.
Physical change is defined as a change that affects the form of a compound or element but it doesn't affect its' chemical composition.Meanwhile, chemical change is defined as a change that affects the composition of a compound and a new substance is formed.Now, for brian's cake he has combined raw ingredients into two pans and bakes the cake. For the cake to be baked, it means the ingredients mixed have changed from liquid to solid and also a new substance has been formed. Thus, we can say that the cake was formed from chemical change.Meanwhile, the icing was formed by physical change because it did not undergo any chemical process and no new substance was formed as only butter, sugar and milk were mixed together.Read more at; https://brainly.com/question/19046658
Which terms are used to identify pure substances?
Answer:
mabey c or d
Explanation:
color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
How many grams of aluminium chloride are produced when 123.2g of chlorine react with aluminium
Answer:
Mass = 154.67 g
Explanation:
Given data:
Mass of aluminum chloride produced = ?
Mass of chlorine = 123.2 g
Solution:
Chemical equation:
2Al + 3Cl₂ → 2AlCl₃
Number of moles of chlorine:
Number of moles = mass/molar mass
Number of moles = 123.2 g/ 71 g/mol
Number of moles =1.74 mol
Now we will compare the moles of aluminum chloride and chlorine.
Cl₂ : AlCl₃
3 : 2
1.74 : 2/3×1.74 = 1.16 mol
Mass of AlCl₃:
Mass = number of moles × molar mass
Mass = 1.16 mol × 133.34 g/mol
Mass = 154.67 g
Alguien me puede hacer el favor de ayudarme con estos 3 ejercicios de balanceo de ecuaciones por oxido reducción por favor 1. Fe2O3 + CO → Fe + CO2 2. Al2O3 + C + Cl2 → CO + AlCl3 3. H2S + O2 → SO2 + H2O
Answer:
1. Fe₂O₃ + 3CO → 2Fe + 3CO₂
2. Al₂O₃ + 3C + Cl₂ → 3CO + 2AlCl₃
3. 2H₂S + 3O₂ → 2SO₂ + 2H₂O
Explanation:
Para balancear ecuaciones redox se acostumbra a usar el método ion-electrón, hay que determinar qué elemento se oxida y cual se reduce lo que a la vez significa, aumento del número de oxidación o descenso del mismo.
1. Fe₂O₃ + CO → Fe + CO₂
Para este caso, el hierro se reduce, pasando de Fe³⁺ a Fe⁰ o lo que se dice estado fundamental.
Fe³⁺ + 3e⁻ → Fe
El carbono del CO se oxida a CO₂ donde el carbono pasa de C²⁺ a C⁴⁺
C²⁺ → C⁴⁺ + 2e⁻
Como los electrones quedaron desbalanceados multiplicamos por 2 y 3 las semi reacciones
(Fe³⁺ + 3e⁻ → Fe ) . 2
2Fe³⁺ + 6e⁻ → 2Fe
(C²⁺ → C⁴⁺ + 2e⁻) . 3
3C²⁺ → 3C⁴⁺ + 6e⁻
Ya podemos balancear la ecuacion final:
Fe₂O₃ + 3CO → 2Fe + 3CO₂
(como ya tenemos 2 atomos de hierro en el oxido, no haría falta agregar el 2 en la estoquiometría)
2. Al₂O₃ + C + Cl₂ → CO + AlCl₃
En este caso el carbono se oxida, y el cloro se reduce
C → C²⁺ + 2e⁻
Cl₂ + 2e⁻ → 2Cl⁻
Como el cloro es una molécula diatómica por cada cloro que se reduce, tendremos dos cloruros, tomando los 2 electrones que libera el C.
En este caso los electrones están balanceados
Al₂O₃ + C + Cl₂ → CO + 2AlCl₃
Han quedado desbalanceados el C y el O, asi que no queda otra que completar con la estequiometría
Al₂O₃ + 3C + Cl₂ → 3CO + 2AlCl₃
3. H₂S + O₂ → SO₂ + H₂O
El O₂ se está reduciendo, pasando de 0 a -2
El S del ácido se oxida de +2 a +4
O₂ + 4e⁻ → 2O⁻²
Son dos atomos de O, que cada átomo puede atrapar dos electrones, por ende, consigue enlazar 4 electrones en total
S⁺² → S⁴⁺ + 2e⁻
Como los electrones quedaron desbalanceados, completamos multiplicando la segunda semi reaccion x2
2S⁺² → 2S⁴⁺ + 4e⁻
O₂ + 4e⁻ → 2O⁻²
2H₂S + O₂ → 2SO₂ + 2H₂O
Ya que el oxigeno quedó desbalanceado en el lado producto, completamos con la estoquimetría
2H₂S + 3O₂ → 2SO₂ + 2H₂O
What’s the best answer?
Compression is the type of stress that deforms rock at which location ?
Answer:
Compression is common at convergent boundaries, tension in divergent boundaries, and shear at transform boundaries.
Explanation:
The three main types of stress go along with the three types of plate boundaries. Rocks can bend and fold. Rocks can also fracture and break.
How many elements do all the “s” orbital span (go across) in each period?
a) 2
b) 6
c) 10
d) 14
The elements do all the “s” orbital span (go across) in each period is 2. Thus option a is correct.
What are elements?Elements are defined as a pure substance made up of only one sort of atom with the same number of protons in its nucleus.
It can also be defined as the a substance that can't be broken down into anything else.
Sublevels are defined as a quantum theory-defined energy level Sublevels are energies associated with electrons in chemistry.
There are mainly four sublevels
s sublevelp subleveld sublevelf sublevelThus, the elements do all the “s” orbital span (go across) in each period is 2. Thus option a is correct.
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help me plsssss ))):
Answer:
crushing an ice cube
Explanation:
crushing an ice cube can be redone by freezing it again in its position
The smallest unit of life is a _____, and all organisms have at least one.
Answer:
cell
Explanation:
hdjdjdjjsisidjsjsjjsisisiisjsjsjs
Answer:
cell
Explanation:
That is the smallest unit of life, and every living thing has at least one cell, such as unicellular living things.
What type of waves transmit signals in satellite communication?
A. Microwaves
B. X-rays
C. Gamma Rays
D. Radio Waves
Answer:
satellites communicate by using radio waves to send signals to the antennas on the Earth. the antennas then capture those signals and process the information coming from those signals.
hope this helps:)
Answer:
D
Explanation:
Kind of self explanatory don't you think?
1) Protons have what kind of charge?
2) Electrons have what kind of charge?
3) Neutrons have what kind of charge?
The question asks me to classify the reaction
CO2 (g)+H20(1) H2CO3 (aq)
The mixture in the large beaker still looked clear like water, but when the students, one at a time, carefully touched the outside of the large beaker, it felt warm to the touch.
Why did the large beaker most likely feel warm?
Answer:
A chemical reaction produced a new substance.
Explanation:
I just answered this on the study island quiz.
Answer:
A chemical reaction produced a new substance or "A"
Explanation:
What is the temperature of a gas if the container has a volume of 2,300 mL, with a pressure of 932 mmHg and 3.51 moles?
Answer:
The preceding temperature is equivalent to approximately 9.6 K => -263.5 °C
Explanation:
Given the provided problem, the formula may be substituted by the corresponding values:
Pressure (P)= 932 mmHg ==> 1.2 atm
Volume (V) = 2,300 mL ==> 2.31 L
Moles (n) = 3.51 moles ==> 3.51 mol
Proportional constant of ideal gas constant: (R) = 0.08206
Therefore, we can equate the following:
T= (PV)
nR
T= (1.2 atm · 2.31 L)
(3.51 mol · 0.08206)
T= 9.6 K ==> -263.5 °C
Thus, the cumulative temperature given the substituents/substance is equivalent to -263.5 °C.