Answer:
3)alpha decay because alpha particles have two protons and two neutrons
Explanation:
When a radioactive isotope undergoes a decay, a daughter nucleus or nuclei is/are formed. The mass number and atomic number of the daughter nucleus gives us an idea of the nature of radioactive decay that the parent nucleus underwent.
If the daughter mass number of the daughter nucleus is four units less than that of the parent nucleus and the atomic number of the daughter nucleus is two units less than that of the parent, then such a decay is an alpha decay.
An alpha particle has two protons and two neutrons thus it has a mass number of 4 and an atomic number of two.
50 extra if correct !!
Which of the following describes continental drift?
A. A continent moves very slowly.
B. The inner core rotates quickly.
C. The outer core causes magnetism.
D. The types of animals on a continent change.
Answer:
A.
Explanation:
the gradual movement of the continents across the earth's surface through geological time.
Answer:
a
Explanation:
meaning of black out
PLEASE HELP DUE IN 20 MINUTES NO LINKS PLEASE
Answer:
A
Explanation:
Electrolysis has to do with the decomposition of a solution by the passage of direct current through it. Current enters and leaves the electrolyte via electrodes.
The positive electrode is called the anode while the negative electrode is called the cathode. Positive ions move towards the cathode while negative ions move towards the anode.
Cu^2+ moves towards the cathode and accepts two electrons to be deposited on the cathode as metallic copper. Also, Cl^- ions move towards the anode and gives up electrons to become oxidized to chlorine gas.
Hence in the electrolysis of CuCl2, copper is obtained at the cathode while chlorine gas is obtained at the anode. Hence 1 and 3 are correct statements.
HELP ME PLEASE!! Which of the following is NOT an example of a chemical change ?
A. Mixing baking soda and vinegar together causing bubbles and foam.
B. A glass cup falling to the floor and breaking.
C. Lighting a piece of paper on fire.
D. Baking a birthday cake
The chemical equation for zinc in hydrochloric acid is: Zn + HCI = ZnCl2 + H2
Does the above equation demonstrate the law of conservation of mass as it is currently written? Explain why or why not.
Answer: No it does not
Explanation:
The law of conservation of mass states that mass is neither created nor destroyed and in this equation you start with 1 molecule of Cl and 1 of H, but on the reactants side you end up with 2 of each. To make it follow the law of conservation of mass you would have to balance the equation
Need help ASAP ( will give 50 points)
Select the correct answer. Which galaxies have light smoothly spread across the
galaxy? A. spiral galaxy B. irregular galaxy C. lenticular galaxy D. elliptical galaxy
Answer:
Your answer would be D, Hope this helps.
PLS HELP NO LINKS PLS
What is the pH of normal rainfall?
Answer:
between 5 and 5.5
Explanation:
Answer:
between 5.0 and 5.5
Explanation:
between 5.0 and 5.5
14. Which of the following is correct about cells?
O They are made of molecules that are made of atoms.
O They are made of organs that are made of organelles.
O They are made of tissues that are made of atoms.
O They are made of atoms that are made of molecules.
W
6NaBr+1AlO3=3Na2O+2AlBr3 How many grams of NaBr would be needed in order to make 23.5 grams of AlBr3
Answer:
23.5 grams of AlBr3 will be produced by 27.20 grams of NaBr
Explanation:
The balanced equation here is
6NaBr + 1AlO3 = 3Na2O + 2AlBr3
6 moles of NaBr are required to produce 2 moles of AlBr3
Mass of one mole of NaBr = 102.894 g/mol
Mass of one mole of AlBr3 = 266.69 g/mol
Mass of 6 moles of NaBr = 6*102.894 g/mol
Mass of two moles of AlBr3 = 2*266.69 g/mol
6*102.894 g NaBr produces 2*266.69 g of AlBr3
23.5 grams of AlBr3 will be produced by (6*102.894)/(2*266.69 )*23.5 = 27.20 grams of NaBr
If a mineral has a mass of 20 and a volume of 4, What is its density?
Answer:
5 g/cm^3
Explanation:
Density of a substance= mass/ volume
Given:
volume = 4,
mass = 20
Assume volume is in cm^3
Mass is in "g"
Then substitute the values
Density of the substance=( 20/4)
= 5 g/cm^3
Il give brainliest question in the picture
Answer:
Nitrogen and Argon
Explanation:
These gases are part of a class of "noble" gases because they don't react with anything.
One mole of water molecules contains how many molecules?
- One gram of water molecules.
- Avogadro's number multiplied by 3, so 1.8066 x 10 24
- Three molecules
- 6.022 x 1023 molecules.
Answer:
6.02x10^23
Explanation:
1 mole of water is equivalent to 1 molecule of 6.02x10^23
(2-2) Is the statement below true or false?
Pure water (H2O) can conduct electricity.
O True
O False
Answer:
its false..
Explanation:
pure water is an excellent insulator and does not conduct electricity. The thing is, you won't find any pure water in nature, so don't mix electricity and water.
hope it helps.
stay safe healthy and happy.....Answer:
False
Explanation:
Pure water does not conduct electricity. This is because pure water do not contain any salts. Pure water can conduct electricity when common salt is added to it, as salt solution is conducting in nature.
Indica el período, el grupo, el nombre y el número atómico de los elementos que se representan con las siguientes configuraciones electrónicas:
Answer:
have g8igcicg9ccgco
Explanation:
gcohogxzrxog floor. gi gi gi gi. r. uvgi7rz. g yde6ifkg. gg g goog oh g of ifz8fd8dti
Lee and some other students working with Dr. Yung were conducting an experiment and ended up with some confusing results. In the experiment, each student combined sodium and hydrogen chloride, but, as shown in the table below, each student ended up with different results. Lee is trying to determine what happened.
In a few minutes, you will see a video of what happened when Lee combined two substances. Before you watch the video, see if you can predict why each student ended up with different results.
Student's name Starting substances Ending substances
Lee sodium and hydrogen chloride hydrogen and sodium chloride
Vera sodium and hydrogen chloride hydrogen, sodium chloride, and sodium
Domingo sodium and hydrogen chloride hydrogen, sodium chloride, and hydrogen chloride
Why do you think Vera and Domingo ended up with three substances after the chemical reaction while Lee only ended up with two?
Answer:
chung long
Explanation:
cause 3 plus 2 =9
Which property of aluminium makes it a suitable metal for soft-drink can?
Answer:
Aluminium is malleable. It means it can be hammered or changed into other shapes easily. In this case, the shape of a soft drink can.
Explanation:
This is my answer.
Sound is created through vibrations in the air which causes the auditory sensation in your ear – making you able to hear the noises that we do. Sound produced by different sources have different characteristics like amplitude , wavelength and frequency. Analyze the diagrams to answer the following questions with suitable reasons. (A)Which represents the highest pitched sound?. Give reason.
Answer:
The answer is A
Explanation:
A had higher frequency and higher the frequency of an object the higher its pitch still be
The part of an atom that is responsible for the bonding of atoms is —
A. protons
B. valence electrons
C. neutrinos
D. neutrons
Answer:
B
Explanation:
Valence electrons only involve in chemical bonding, since they are farthest from the nucleus. Hope this helps!
WHAT DO THESE DIAGRAMS MEAN PLS HELP
Answer:
(I). Evaporation
(ii). Sublimation
Which process is represented by the label a?
Answer:
Sediment to sedimentary rock (and vice versa) is Compactation and Cementation.
Explanation:
This happens via Lithification, which is the compacting of sediments under pressure.
Find the number of moles in:
12.044 x 10^24 atoms
Explanation:
number of moles = number of particle/ 6.02X10^23
= 12.044 X 10^24/6.02×10^23
=20.0066 moles so round it up to 3 S.F
So
=20.0moles
PlEASE HELP ME QUICK PLEASE!!!
Answer:
first is c and second is a
O rendimento de determinada máquina térmica é de 5%. Sabendo que essa máquina obedece as leis da termodinâmica e que ela recebe da fonte quente 5000J de energia, então o trabalho realizado por essa máquina a cada ciclo é de:
Answer:
Trabalho realizado por máquina térmica = 250 J
Explanation:
Dado
Eficiência da máquina térmica = 5% = 0,05
A eficiência é igual à proporção do trabalho realizado pela máquina térmica para o calor fornecido a ela
Por isso,
0,05 = Trabalho realizado por máquina térmica / 5000 J
Trabalho realizado por máquina térmica = 5000 J * 0,05 = 250 J
5. The space around a magnet in which there is a magnetic effect is called
A. an electromagnet
B. a magnetic pole
C. lodestone
D. a magnetic field
Answer:
The space surrounding a magnet within which the magnetic effect is felt is called Magnetic field. A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetic materials.
A pool owner adds a compound containing chlorine to the pool to disinfect it. However, too much of the compound is added. As a result, the water becomes too acidic. What could the pool owner do to reduce the acidity of the pool
The question is incomplete, the complete question is;
A pool owner adds a compound containing chlorine to the pool to disinfect it. However, too much of the compound is added. As a result, the water becomes too acidic. What could the pool owner do to reduce the acidity of the pool?
He could add another acid to the pool to compete with the existing acid.
He could add a metal salt to the pool to precipitate the acid.
He could add a base to the pool to neutralize the acid.
Answer:
He could add a base to the pool to neutralize the acid.
Explanation:
The reaction between an acid and a base is called a neutralization reaction. A neutralization reaction is defined as a reaction between an acid and a base leading to the formation of salt and water only.
If the owner of the pool discovers that the pool has become too acidic, all that needs to be done is to introduce a base into the pool that will neutralize the acid according to the reaction;
Acid + base ------> salt + water
What is Radical. Write it types also.
Answer:
Radical is a charged ion
the types are cation and anion.
cation is positively charged and anions are negatively charged
Explanation:
5 moles of oxygen gas is equal to how many grams?
Answer:
160 g
Explanation:
1 mole of oxygen atom = 16 g
Number of moles of oxygen given = 5 mole
Molecular weight of oxygen molecule = 32 g/ mole
Weight of oxygen in gram = 5 mol x 32 g/mol= 160 g
Therefore, 160 g of oxygen is present in 5 moles.
1. El sorbitol, utilizado como edulcorante en algunos alimentos "sin azúcar" tiene un peso molecular de 182 g/mol y una composición porcentual en masa de 39,56% de Carbono, 7,74% de Hidrógeno y 52,70% de Oxígeno. ¿Cuál es la fórmula molecular del Sorbitol? 2.- Se determina que una muestra de benzoato de metilo, un compuesto empleado en la elaboración de perfumes, contiene 70,57% de carbono, 5,93% de hidrógeno y 23,49% de oxígeno. Obtenga la fórmula molecular de esta sustancia si su peso molecular es de 136,1 g/mol. 3.- El etilenglicol, la sustancia empleada en los anticongelantes para automóvil, se compone de 38.7% en masa de Carbono, 9.7% en masa de Hidrógeno y 51.6% en masa de Oxigeno. Su masa molar es de 62.1 g/mol. Determine la fórmula molecular. 4.- El compuesto paradicloro se empleó a menudo como bola de naftalina. Si su análisis es 49.02% de C, 2.743% de H, y 48.24% de Cl, y su masa molecular, 147.0 g/mol. ¿Cuál es su fórmula molecular?.
Answer:
nnnnaaaoooo. seeeeiiii!!!!!!b k ibhhgj
1) An unlabeled laboratory solution is found to contain a H+ ion concentration of 1 x 10-4
M. What is the OH concentration, [OH-], in the solution?
A) 1 x 10-18 M.
B) 1x 10-14 M.
C) 1 x 10-10 M
D) 1x 10-7 M
Answer:
C) 1 x 10-10 M
Explanation:
To solve this question we must use the equation:
Kw = [H+] [OH-]
Where Kw is the equilibrium dissociation of water = 1x10-14
[H+] is the molar concentration of hydronium ion = 1x10-4M
[OH-] is the molar concentration of hydroxyl ion
Replacing:
1x10-14= 1x10-4 [OH-]
[OH-] = 1x10-14 / 1x10-4M
[OH-] = 1x10-10 M
Right option is:
C) 1 x 10-10 MIt takes 32.35 mL of a 0.0895 M hydrochloric acid solution to reach the equivalence point in the reaction with 25.00 mL of barium hydroxide. 2HCl(aq) Ba(OH)2(aq) 2H2O(l) BaCl2(aq) What is the molar concentration of the barium hydroxide solution
Answer:
[tex]M_{base}=0.0579M[/tex]
Explanation:
Hello there!
In this case, according to the given information in the undergoing chemical reaction, it is possible for us to realize that barium hydroxide reacts with hydrochloric acid in a 1:2 mole ratio, which means that at the equivalence point, we have:
[tex]2n_{base}=n_{acid}[/tex]
That can be written in terms of molarity and volume:
[tex]2M_{base}V_{base}=M_{acid}V_{acid}[/tex]
Thus, we solve for the molarity of the barium hydroxide to obtain:
[tex]M_{base}=\frac{M_{acid}V_{acid}}{2V_{base}} \\\\M_{base}=\frac{0.0895M*32.35 mL}{2*25.00mL}\\\\M_{base}=0.0579M[/tex]
Regards!