Answer:
The correct answer is A
Explanation:
A radio telescope is used to detect, collect and focus radio waves from distant objects in the sky or space. While a compound telescope, by design, can both refract and reflect waves. A reflection telescope uses curved mirrors to reflect light to form an image. A refraction telescope forms an image using a lens as its objective.
From the above definitions, it can be deduced that option A is the correct answer.
An atom has an atomic number of 19 and mass number of 39 how many electrons and protons does it have?
Answer:
19 protons, 20 neutrons and 18 electrons.
Explanation:
The atomic number gives the number of protons 19
p = 19
The atomic mass is the sum of the protons and neutrons
p + n = 39 p = 19
put p into the equation and solve for n the neutrons.
19 + n = 39
Subtract 19 from both sides
19 − 19 + n = 39 − 19
n = 20
The number of electrons equals the number of protons in a neutral atom. The positive charge equals the negative charge. The negative charge is the number of electrons. This ion has a charge of +1. So solve for the negative charge.
− 19 + 1 = − 18
The negative charge is -18 so
e = 18
In the reaction
Cu° + 2 H2SO4 → CuSO4 + 2 H2O + SO2,
copper is
A) reduced and is the oxidizing agent
B) reduced and is the reducing agent
C) oxidized and is the oxidizing agent
D) oxidized and is the reducing agent
sucrose (sugar)crystals obtained from sugarcane and bet root are mixed together .with it be a pure substancesor a mixture ?give reasons
Answer:
It will be a pure substance (compound) because chemical composition of sugar crystals will be the same whether obtained from sugarcane or from beet root.
hope it's help you plz mark as brain list ...!!Define the boiling and evaporation using kinetic theory
Answer:
Explanation:
By the kinetic molecular theory (particle model), all matter consists of particles, there are spaces between the particles, the particles are in constant random motion, and there are forces of attraction and repulsion between the particles.
Furthermore, temperature is defined to be a measure of the average kinetic energy of the particles.
Evaporation is a change of phase from liquid to gas explained as follows :
When particles in the liquid phase are heated, they gain kinetic energy and move faster and further apart. Eventually they have enough energy to escape the forces of attraction holding them together in the liquid phase and they move very fast and far from each other and exist in the gaseous phase.
Which reaction occurs at the cathode of a galvanic cell that has an aluminum electrode in an electrolyte with aluminum ions and copper electrode in an electrolyte with copper ions ? The reduction potential for the reduction of Cu^ 2+ = 0.34 The reduction potential for the reduction of AP^ 3+ =-1.68V.
Answer:
[tex]{ \bf{Cu {}^{2 + } + 2e \: → \: Cu }}[/tex]
The reaction that occurs at the cathode of a given galvanic cell is:
Cu²⁺ + 2e⁻ → Cu
What is Galvanic Cell?A galvanic cell can be defined as an electrochemical cell that converts the chemical energy of spontaneous redox reactions into electrical energy. The galvanic cell makes use of chemical reactions to generate electrical energy.
A galvanic cell consists of two half-cells and a salt bridge. Each half-cell further contains an electrode dipped into an electrolyte. When both electrodes are dipped in the same electrolyte, then there is no need for a salt bridge.
At the anode, an oxidation reaction occurs at this electrode. At the cathode, reduction occurs at this electrode. The anode has a negative potential with respect to the solution while the cathode has a positive potential with respect to the solution.
As in the question, the reduction of Cu²⁺ has a positive reduction potential. Therefore, the reduction of the copper will occur at the cathode.
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What is the molarity of a solution prepared by adding enough water to 2 g of acetone to make a total volume of 1.60 l?
Explanation:
answer is in photo above
When an Li atom becomes an Li+ ion, the Li atom
Answer:When a lithium atom forms an Li+ ion, the lithium atom (1) gains a proton (2) gains an electron (3) loses a proton (4) loses an electron
Se trata 50 g de aluminio que posee 10% de impurezas con suficiente cantidad de ácido sulfúrico ¿qué peso de sulfato de aluminio se obtiene si el porcentaje de rendimiento fue de 70%? P.A. (uma): Al: 27, S = 32, O = 16
Respuesta:
199.5 g
Explicación:
Paso 1: Escribir la reacción balanceada
2 Al + 3 H₂SO₄ ⇒ Al₂(SO₄)₃ + 3 H₂
Paso 2: Calcular la masa pura de 50 g de Al
Aluminio tiene 10% de impurezas, es decir, 10% de 50 g = 5 g. Luego, tiene 50 g - 5 g = 45 g de Al puro.
Paso 3: Calcular la masa teórica de Al₂(SO₄)₃ obtenida a partir de 45 g de Al
La relación de masas de Al₂(SO₄)₃ a Al es 342:54.
45 g Al × 342 g Al₂(SO₄)₃/54 g Al = 285 g Al₂(SO₄)₃
Paso 4: Calcular la masa real de Al₂(SO₄)₃ obtenida
El rendimiento de la reacción es de 70%.
285 g × 70% = 199.5 g
is it true that the most reactive metals are quite plentiful in the Earth's crust?
Answer:
yes
Explanation:
as it had got crushed down in the dinosaurs age
Which of the following pairs lists a substance that can neutralize H2SO4 and the salt that would be produced from the reaction?
O CaOH2 and Ca(SO4)2
OLIOH and Li2SO4
ONH, and NH,SO4
O NH3 and (NH3)2SO4
sh
Answer: b
Explanation:
I took the test
The correct answer is LiOH and Li2SO4.
A strong acid is neutralized by a strong base to yield a normal salt.
A neutralization reaction is a reaction between an acid and a base to yield salt and water only.
An acid can be strong or weak. A base can also be strong or weak. "Strong" or "weak" has to do with the extent of ionization of the acid or base in water. Usually, a strong acid is neutralized by a strong base.
Since H2SO4 is a strong acid, it will require a strong base such as LiOH to neutralize it and the product will be the normal salt Li2SO4.
https://brainly.com/question/16255996
17. (1.09 x 102) x (2.79 x 10')
18. (5.75 x 104) / (4.71 102)
19.(3.38 x 106) x (7.80 x 104)
20. (7.04 x 10) / (9.45 x 10-)
Answer:
17. 3,101.922
18. 1.2447441822
19. 288,057.12
20. 0.74497354
1. A(n) bond forms when one atom gives up one or more electrons to another atom. 2. Atoms or molecules with a net electric charge due to the loss or gain of one or more electrons are . 3. A(n) bond involves the sharing of electron pairs between atoms, also known as a molecular bond. 4. When one pair of electrons is shared between two atoms, a bond is formed. 5. When two pairs of electrons are shared between two atoms, a bond is formed. 6. A bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms. As a result, one end of the molecule has a slightly negative charge and the other a slightly positive charge.
Answer:
For 1: Ionic
For 2: Ions
For 3: Covalent
For 4: Single
For 5: Double
For 6: Polar
Explanation:
For 1:An ionic compound is formed when the complete transfer of electrons takes place from one element usually, metals (forming cation) to another element usually, non-metals (forming anions).
Hence, an ionic bond forms when one atom gives up one or more electrons to another atom
For 2:An ion is formed when an element loses or gains an electron. Two types of ions are formed which are cations and anions.
Hence, atoms or molecules with a net electric charge due to the loss or gain of one or more electrons are ions.
For 3:A covalent bond is defined as the bond which is formed by the sharing of electrons between two atoms.
Hence, a covalent bond involves sharing electron pairs between atoms, also known as a molecular bond.
For 4:A single bond is defined as the bond in which 1 bond is present between the two atoms or 1 pair of electrons (two electrons) are shared between the atoms.
Hence, when one pair of electrons is shared between two atoms, a single bond is formed.
For 5:A double bond is defined as the bond in which 2 bonds are present between the two atoms or 2 pairs of electrons (four electrons) are shared between the atoms.
Hence, when two pairs of electrons are shared between two atoms, a double bond is formed
For 6:A polar bond is defined as the bond where unequal sharing of electrons takes place. This creates a dipole within a molecule.
Hence, a polar bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms.
Bacteria, viruses, parasites, and mold are examples of which category of hazard-causing agents?
Answer:
abiotic infectious agent
Explanation:
not sure tho
1-bromo-1-2-diphenylpropane
Answer:
Aldehyde
Explanation:
1-bromo-1-1diphenylpropane
A gardener decides to use only part of their garden in the spring. What will most likely happen first in the unused part of the garden?
Answer:
Growth of weeds and grasses
Explanation:
The part of the garden, probably left to rest by the Gardner, would start experiencing a legion of invasive plants. Giant weeds and grasses could be seen, and brambles and tree seedlings could also sneak in.
Some Gardeners would recommend the use of herbicides to restore order to an abandoned garden even though certain scientists are of the opinion that chemicals may not offer a sound solution to the problem.
What would happen to the entropy in the reaction 203(9) ► 302(9)?
A. It is impossible to tell.
B. It stays the same.
C. It decreases.
D. It increases.
bez number of particles in reaction increases so randomness or entropy increase.
as entropy is the degree of randomness of particles in a system
The reactants of two chemical equations are listed.
Equation 1: CuSO4 and NaOH
Equation 2: Fe and CuSO4
Based on the type of reaction, which reaction can be used to extract copper metal from copper sulfate solution?
A - Equation 2, because Fe being more reactive, replaces Cu from CuSO4
B - Equation 2, because Fe being more reactive, replaces S from CuSO4
C - Equation 1, because Na being more reactive, exchanges position with Cu in CuSO4
D - Equation 1, because Na being more reactive, exchanges position with S in CuSO4
The reaction that can be used to extract copper metal from copper sulfate solution would be equation 2.
Fe will displace Cu from CuSO4 because it is more reactive. In other words, Fe ranks higher than Cu in the reactivity series.
Thus: [tex]Fe + CuSO_4 ---> Cu + FeSO_4[/tex]
Even though Na will displace Cu from CuSO4, equation 1 will result in the formation of Cu(OH)2 instead of free Cu because it is a double replacement reaction.
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Please answer the question
Answer:
Oxygen is the nearest noble gas
URGENT HELP
26. A solution of hydrogen peroxide is 23.3% H2O2 by mass and has a density of 1.11
g/cm”. The molarity of the solution is:
a) 7.14 M
b) 0.259 M
c) 7.60 M
d) 7.93 M
e) none of these
Use the average acceleration obtained in Activity 1 to determine how far the ball should drop at 0.3 second, 0.5 second, and 0.7 second. Using the simplified formula y = 1/2 at2 (because y0 = 0 and v0 = 0), calculate y to one decimal place.
Answer:
0.3 sec : -0.4 m
0.5 sec: -1.2 m
0.7 sec: -2.3 m
Explanation:
0.3 sec: 1/2(-9.3 m/s^2)(0.3 s)^2 = -0.4 m
0.5 sec: 1/2(-9.3 m/s^2)(0.5 s)^2 = -1.2 m
0.7 sec: 1/2(-9.3 m/s^2)(0.7 s)^2 = -2.3 m
What is pH?
O A. A measurement indicating how acidic a solution is
B. A concentration of total ions dissolved in solution
C. A level of dissolved gases that are in solution
O D. A component of solutions that makes them acidic
Answer:
Awnser is A
Explanation:
Answer:
Hello There!!
Explanation:
The answer is↬O A. A measurement indicating how acidic a solution is.
hope this helps,have a great day!!
~Pinky~
What is the structure of an amino acid? A. Amino group, phosphate group, pentose sugar, nitrogen base B.Amino group, R group, carboxylic acid group C. Amino group, disulfide group. R group D. Phosphate group, pentose sugar, nitrogen base
Amino acids are the monomers that make up proteins. Each amino acid has the same fundamental structure , which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.
Amino group, R group, and the carboxylic acid group. Hence, option B is correct.
What are Amino acids?Amino acids are the monomers that makeup proteins.
Each amino acid has the same fundamental structure, which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.
Hence, option B is correct.
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Please help please help
Answer:
The mass percentage of chlorine is 60.66 % chlorine in the compound sodium chloride.
Explanation:
Which statements are true of the reaction below? 2Na(s) + Cl2(g) ---> 2NaCl(s)

A.
Na(s) is a reactant.

B.
NaCl is a product.

C.
NaCl is a liquid.

D.
Cl2 is a solid.
Answer:
A and B are both true
Explanation:
Na is REACTING with Cl2 to PRODUCE NaCl
Our solar system is more than _________ in diameter.
Answer: 287.46 billion km
Explanation: calculated it myself. nah but thats the answer
Which statements are correct regarding the Law of Conservation of Matter and Energy?
Matter or energy can create itself.
Matter or energy was created by known principles of physics and chemistry.
Matter or energy can change from one form to the other.
The law agrees with the Biblical account of Creation
(more than one answer)
Answer:
Matter or energy can change from one form to the other
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed but can only be transformed i.e. changed from one form to another. For example, mechanical energy can be changed to electrical energy.
Likewise, the law of conservation of mass/matter states that matter can not be destroyed or created but can change via physical or chemical means to conserve it. For example, matter can change from liquid state to gaseous state.
From the above two laws, it can be said that "matter or energy can change from one form to the other".
The ksp of StS04 is 3.2x10-7 What is the equilibrium concentration of sulfate lon a 1.0-L solution of strontium sulfate to which 0.10 mol of Sr(CH3CO2)2 has been added?
Answer:ehwusvudhwdvwxkwvbxbwxbxiwhxjvwxjvxwjxvjxvwxiwvxiwzgiwxvwjsbwis
HOPE IT HELPS IF YOU LIKE MY ANSWER THEN MARK ME AS BRAINLIEST ;-);-)
Heavy rains fill a reservoir, causing the dam that holds the water to break. As a result, the areas downstream are suddenly flooded. Which question would a scientist seek to answer?
Answer:
"How to prevent the collapse of the dam that contains water from heavy rains?"
Explanation:
Scientists must work to create innovations capable of bringing benefits to human life and combating disadvantageous and harmful situations. The overflow of dams is something very harmful, as the resulting flooding can cause structural, economic and even public health problems. When this overflow is caused by natural elements, such as heavy rains, the work of scientists in solving these issues is even more important and necessary. In order to resolve the dam failure caused by excess rainwater, scientists must work to answer the following question:
"How to prevent the collapse of the dam that contains water from heavy rains?"
Which of the following would be expected to have the lowest boiling point?
CH3CH2CH2CH3, CH3CH2NHCH3, NH2CH2CH2NH2, CH3CH2CH2NH2
O CH3CH2NHCH3
O NH2CH2CH2NH2
O CH3CH2CH2NH2
O CH3CH2CH2CH3
Answer:
CH3CH2CH2CH3
Explanation:
The boiling point of a compound depends on the nature of intermolecular interaction between the molecules of the compound.
If a molecule is nonpolar and has a low molecular mass, then its molecules are most likely held together only by weak intermolecular bonds such as dispersion forces. These forces are easily broken and the molecules move apart hence the molecule possess a low boiling point.
Polar molecules and molecules having higher molecular mass tend to have higher boiling points.
Among all the compounds listed, CH3CH2CH2CH3 is non polar and has the lowest molecular mass hence it exhibits the least boiling point.
A student who is performing an experiment must measure out 0.02-mL of 0.50-M HCl. The most accurate piece of equipment to measure the quantity would be a?
A) 50 mL buret
B) 25 mL graduated cylinder
C) 10 mL cylinder
D) 1 mL pipet
Answer:
Choice D) 1 mL pipet
Explanation:
If you are trying to extract 0.02 mL of HCl, you are going to need a piece of equipment that can measure very small units. Thus, Choice D would be the correct answer.
