Answers
Option D - They are negatively charged and located outside the nucleus is the correct alternative.
We have electrons.
We have to determine which of the given statements are true about electrons.
What are Electrons ?An electron is a negatively charged subatomic particle that can be either bound to an atom or free (not bound).
According to the question -
The role of electrons inside the atom is as follows -
Electrons are outside nucleus and revolve around it in circular orbit.Electrons are negatively - charged.Electrons are outside nucleus.Hence, Option D is the correct alternative.
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Related Questions
Roasting battle, Bored xD
Answers
Answer: ok lets battle XD
Explanation:
Answer:
hmmmmm
Explanation:
seems kinda sus
If a mixture of 50% liquid water and 50% ice is at zero degrees Celsius, which of the following will change if a small amount of heat is added to the mixture? (There may be more than one correct answer.) a. A small amount (not all) of the ice will melt.
b. The ratio of liquid to solid water will increase.
c. The temperature of the mixture will increase. d. The melting point for the remaining solid ice will change.
Answers
Due to the latent heat of fusion, when a modest amount of heat is added, ice will transform into water without changing the temperature. Therefore, a portion of the ice may melt (but not all of it). The right answer is A.
What exactly is fusion?The sun and stars are both powered by fusion. Fusion is the process by which two hydrogen atoms join, or fuse, to create a helium atom. Throughout the process, a portion of both the hydrogen's energy is converted into energy.
What takes place when fusion?When multiple light nuclei combine by fusion, a heavy nucleus is produced. The process results in the production of energy because as the size of the single nucleus that forms is less than the sum of the masses of the two original nuclei. Every leftover mass is transformed into energy.
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the table below gives the atomic number of elements w x and y and z.The the letters do not represent the actual symbols of the elements .
W. X Y. Z
9. 10. 11. 12
which one of the element is less reactive explain .
Answers
Element w is less reactive than elements x, y, and z. The element with the lower atomic number is typically less reactive.
Element w has an atomic number of 9, element x has an atomic number of 10, element y has an atomic number of 11, and element z has an atomic number of 12. Based on this information, we can conclude that element w is less reactive than elements x, y, and z.
This is because the reactivity of an element is largely determined by the number of valence electrons it has. Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical reactions. Elements with fewer valence electrons are less reactive because they are more stable. Element w has only one valence electron, while elements x, y, and z have two, three, and four valence electrons, respectively.
In general, elements with a full outermost shell of electrons, such as the noble gases, are the least reactive because they are highly stable. Elements that are close to having a full outermost shell, such as element w, are also relatively stable and less reactive. On the other hand, elements with only a few valence electrons, such as the alkali metals, are highly reactive because they are trying to gain or lose electrons in order to achieve a full outermost shell.
Overall, the reactivity of an element is determined by its electronic structure, with elements having fewer valence electrons generally being less reactive than those with more. In the case of the elements w, x, y, and z, we can see that element w has the fewest valence electrons and is therefore the least reactive.
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Chemistry (Chemical Bonding Test)
Which of the following molecules is non-polar?
Select one:
O a. HF
O b. NH3
O c. CH₂F2
O d. CF4
O e. HCN
Answers
Put the elements in order from easiest to hardest to remove an electron. Ba,Be,Ca,Sr.
Answers
Answer:
Ba,Sr,Ca,Be
Explanation:
as atomic size increases ionisation potential decreases
How is possible for you to feel heat coming from the sun ?
Answers
Answer: The Sun is so hot that it radiates most of its light in visible wavelengths, and these photons heat the Earth including the people on it. The photons that aren't reflected are absorbed. The absorbed photons transfer their energy to the skin, increasing its temperature, and again, we feel the sensation of heat.
Explanation:
A Hertzsprung-Russell diagram shows the relationship between star's luminosity and surface temperature. The Sun is shown as a 1 on the scale along the main axis. Which information can be inferred about the Sun according to the graph? Select ALL that apply. A) The Sun is the hottest star on record. B) The Sun is the brightest star in the galaxy. C) The Sun is the largest star in the universe. D) The Sun is a star with an intermediate temperature. E) Many stars are thousands or millions of times brighter than the Sun.
Answers
Answer:
Its D and E
Explanation:
i took the test and the other guy who answered gave u half of the answer
hope this helps
pls mark brainliest
The information which can be inferred about the Sun according to the graph include:
The Sun is a star with an intermediate temperature.Many stars are thousands or millions of times brighter than the Sun.What is a Graph?This is defined as a pictorial representation of data in an organized manner.
From the graph, we can infer that the Sun has an intermediate temperature and is less brighter than most stars.
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What element does “X” represent in Figure 1?
Helium
Krypton
Neon
Argon
Answers
Answer:
Argon
Explanation:
It's atomic number is 18
hope that's it
12. 5.6g of solid copper was heated with 476.2 J at room temperature (25°C). Given that
copper has a C of 0.38 J/g°C, what would its final temperature be?
Answers
Answer:
The final temperature of the copper would be 311.3°C.
I hope this helps you
I need help figuring it out the answers were wrong I put in
Answers
Please help. Will give brainliest.
Answers
Answer:
B.
Explanation:
i think its B
A galvanic cell consists of a Mg electrode in a 1 M Mg(NO3)2 solution and another metal electrode X in a 1 M X(NO3)2 solution.
The galvanic cell has an E°cell value of 1.61 V. Which of the following elements fits the identity of X. (Use table table 18.1)
Select one:
a.
Pb
b.
Zn
c.
Ni
d.
Fe
e.
Mn
Answers
Answer:
To determine the identity of metal X, we need to compare the standard reduction potentials of the possible metals with the standard reduction potential of the Mg half-reaction.
From Table 18.1, we can find the standard reduction potentials for each of the metals listed:
Pb: -0.13 V
Zn: -0.76 V
Ni: -0.25 V
Fe: -0.44 V
Mn: -1.18 V
The reduction half-reaction for the Mg electrode is:
Mg2+ + 2e- → Mg E° = -2.37 V
The overall reaction for the galvanic cell is:
Mg(s) + X2+(aq) → Mg2+(aq) + X(s)
The standard cell potential is given by:
E°cell = E°(cathode) - E°(anode)
where the cathode is the reduction half-reaction and the anode is the oxidation half-reaction.
Substituting the given values, we get:
1.61 V = E°(X2+/X) - (-2.37 V)
Simplifying, we get:
E°(X2+/X) = 1.61 V + 2.37 V = 3.98 V
Comparing E°(X2+/X) with the standard reduction potentials in Table 18.1, we see that only zinc (Zn) has a reduction potential that is more negative than 3.98 V. Therefore, the metal X is zinc (Zn).
Therefore, the answer is (b) Zn.
Carbon-14 has a half-life of 5730 years. If an original sample was 100g of C¹4 and it is now 0.781g of C14, how old is your sample?
Answers
Answer:
40,113 years
Explanation:
To find the age of the sample, you need to use the half-life formula:
\(N(t)=N_0(\frac{1}{2})^{t/h\)
In this formula:
------> N(t) = current mass (g)
------> N₀ = initial mass (g)
------> t = time passed (yrs)
------> h = half-life (yrs)
You can plug the given values into the equation and rearrange the formula to find "t".
N(t) = 0.781 g t = ? yrs
N₀ = 100 g h = 5730 yrs
\(N(t)=N_0(\frac{1}{2})^{t/h\) <----- Half-life formula
\(0.781=100(\frac{1}{2})^{t/5730}\) <----- Insert values
\(0.00781=(\frac{1}{2})^{t/5730}\) <----- Divide both sides by 100
\(log_{1/2}(0.00781)=log_{1/2}((\frac{1}{2})^ {t/5730})\) <----- Take \(log_{1/2}\) of both sides
\(7.00 = \frac{t}{5730}\) <----- Solve \(log_{1/2}\)
\(40,113 = t\) <----- Multiply both sides by 5730
The given sample is 40,113 years .
What do you mean by half-life ?Half-life, in radioactivity, is the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.
Half-life formula,
\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\) .......(1)
where,
N(t)=current mass
N₀=initial mass
t=time period
h=half -life
Given,
N(t)=0.781g, t=? yrs, N₀=100g, h=5730 years
\(\rm N(t)\;=N_0(\dfrac{1}{2})^\frac{t}{t1/2}\)
put the values, in ......(1)
0.781=100(1/2) \(t/5730\\\)
log₁/₂(0.00781)=log₁/₂ ( 1/2)\(t/5730\)
7=t/5730
40,113=t
Hence, the given sample is 40,113 years .
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5. Where would you find the focus of an earthquake?
Earth Science .
Answers
Answer:
below the surface
Explanation:
A slime mold is one of the slowest-moving organisms, traveling at top speeds of 1.02 millimeters per hour. What is the speed of a slime mold in inches per day?
Answers
We are given a speed of 1.02 mm/hr and we have to convert that speed into inches/day. To find the answer to our problem we can use a 2 steps conversion. First we can convert mm into inches and then the hr into days.
We know that there are 25.4 mm in 1 inch. So let's convert it.
25.4 mm = 1 inch
Speed = 1.02 mm/hr * 1 inch / (25.4 mm) = 0.04016 inch/hr
Speed = 0.04016 inch/hr
Then we know that there are 24 hours in 1 day.
24 hrs = 1 day
Speed = 0.04016 inch/hr * 24 hr/(1 day) = 0.964 inch/day
Speed = 0.964 inch/day
The speed of a slime mold in inches per day is 0.964.
Which could be the missing reason in Step 3?
alternate interior angles are congruent
alternate exterior angles are congruent
vertical angles are congruent
corresponding angles are congruent
Answers
Answer:
a) alternate interior angles are congruent
Explanation:
on edgen
How are ionic compounds named?
Answers
Answer:
Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions.
Explanation:
For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.
The structures of D-ribose and D-arabinose are shown below. These two molecules are
Tautomers
Enantiomers
Anomers
Epimers
Answers
The structures of D-ribose and D-arabinose are epimers as the configuration of only one asymmetric carbon is different. Therefore, option (D) is correct.
What are epimers?In stereochemistry, an Epimer can be specified as one of a pair of stereoisomers. Two isomers present in the molecule differ at the stereogenic center while the rest remain identical.
A molecule contains many stereocenters leading to different stereoisomers. Stereoisomers are molecules that contain the same constitution and molecular formula in the three-dimensional orientations of their atoms in space.
D-ribose and D-arabinose epimers create a single difference at the C-2 asymmetric carbon atom. Therefore, the given two molecules are epimers.
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3 What is used to test for chlorine?
A a glowing splint
B) damp litmus paper
C limewater
D potassium manganate (VII) solution
Answers
Answer:
B. Litmus paper
Explanation:
The test for chlorine can use either type of litmus paper, but blue litmus paper is used most commonly. The litmus paper must be damp - the water dissolves some of the chlorine so that it can react with the indicator on the litmus paper. This test shows that chlorine is a powerful bleach.
Periodic trends answer key chemistry 10th grade
Answers
Trends in modern periodic table are:
variation of valency, atomic size , metallic properties and electronegativity
Valency - number of valence electrons . Elements of each group have same number of valence electrons. So, they have the same valency.
Atomic size- It is distance from the centre of the nucleus to the valence shell of the atom.
Along the period – Atomic radius decreases as effective nuclear charge increases . It pulls valence electrons closer to the nucleusDown the group – Atomic radius increases because new shells are added , thus the distance between nucleus and valence electrons increases.Metallic properties -
Along the period – Metallic character decreases because tendency to lose valence electrons decreases due to the increasing nuclear charge.Down the group – As the distance between nucleus and outermost electron increases, nuclear pull decreases. This increases the tendency of an atom to lose valence electrons, thus metallic character increases.Electronegativity-
Along the period – Electronegativity increases as the tendency to gain electrons in valence shell increases due to increasing nuclear charge. Down the group – Since distance between the nucleus and valence shell increases, nuclear pull decreases. This decreases tendency of atom to gain an electron, thus electronegativity decreases.So we can conclude that periodic trends are specific patterns which are present in the periodic table, that illustrate different aspects of a certain element
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Aerogel or "solid smoke" is a novel material that is made of silicon dioxide, like glass, but is a thousand times less dense than glass
because it is extremely porous. Material scientists at NASA's Jet Propulsion Laboratory created the lightest aerogel ever in 2002, with
a density of 0.00011 pounds per cubic inch. The material was used for thermal insulation in the 2003 Mars Exploration Rover. If the
maximum space for insulation in the spacecraft's hull was 2921 cm", what mass (in grams) did the aerogel insulation add to the
spacecraft?
Answers
The mass that the aerogel insulation added to the aircraft, with respect to glass, is 8.8 × 10³ g.
The density of the aerogel is 0.00011 lb/in³. We will convert it to g/cm³ using the following conversion factors:
1 lb = 454 g1 in³ = 16.4 cm³\(\frac{0.00011lb}{in^{3} } \times \frac{454g}{1lb} \times \frac{1in^{3} }{16.4cm^{3} } = 0.0030 g/cm^{3}\)
If the maximum space for insulation in the spacecraft's hull was 2921 cm³, the mass that would occupy the aerogel with a density of 0.0030 g/cm³ is:
\(2921 cm^{3} \times \frac{0.0030g}{cm^{3} } = 8.8 g\)
Glass is about 1000 times denser than aerogel. That is,
\(0.0030 g/cm^{3} \times 1000 = 3.0 g/cm^{3}\)
If the maximum space for insulation in the spacecraft's hull was 2921 cm³, the mass that would occupy the glass with a density of 3.0 g/cm³ is:
\(2921 cm^{3} \times \frac{3.0g}{cm^{3} } = 8.8 \times 10^{3} g\)
The mass that would add the aerogel with respect to the glass is:
\(8.8 \times 10^{3} g - 8.8 g \approx 8.8 \times 10^{3} g\)
The mass that the aerogel insulation added to the aircraft, with respect to glass, is 8.8 × 10³ g.
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Suppose that instead of a 6 M solution, only 2 M NaOH was available in the laboratory
to prepare the 0.3 M NaOH needed for your titration. Describe how you would prepare
≈ 0.3 M NaOH from a 2 M NaOH solution.
Answers
Suppose 100 ml of 2 M NaOH solution is available in the laboratory. To prepare 0.3 M of NaOH, take the 100 ml of 0.2 M solution and dilute it to 666.6 ml.
What is molarity?Molarity is a term used to represent the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in liter. Molarity is the most common term used to express concentration.
We can prepare a certain molar solution from a stock solution of different molarity by proper dilution. We have the formula for volume and molarity of solutions.
M1V1 = M2V2.
Consider the 2 M NaOH is taken in 100 ml. Thus the volume to which this solution has to be diluted to form the 0.3 M solution is calculated as follows:
2 M × 100 ml = 0.3 × V2
V2 = 2 × 100 / 0.3
= 666.6 Ml.
Therefore, 100 ml of 2 M solution has to be diluted to 666.6 ml to obtain a solution of 0.3 M.
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A \pu{1.60 g}1.60 g1, point, 60, space, g calcium supplement contains 37.8\%37.8%37, point, 8, percent \ce{Ca}CaC, a by mass. The calcium is present in the supplement as \ce{CaCO3}(s)CaCOX 3 (s) (molar mass \pu{100.09 g/mol}100.09 g/mol100, point, 09, space, g, slash, m, o, l). How many grams of \ce{CaCO3}(s)CaCOX 3 (s) are in the calcium supplement?
Answers
A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.
We want to calculate the mass of CaCO₃ in a 1.60 g supplement. We need to consider the following relationships.
The mass percent of Ca is 37.8%, that is, there are 37.8 g of Ca every 100 g of supplement.The molar mass of Ca is 40.08 g/mol.The molar ratio of Ca to CaCO₃ is 1:1.The molar mass of CaCO₃ is 100.09 g/mol.\(1.60gSup \times \frac{37.8gCa}{100gSup} \times \frac{1molCa}{40.08gCa} \times \frac{1molCaCO_3}{1molCa} \times \frac{100.09gCaCO_3}{1molCaCO_3} = 1.51gCaCO_3\)
A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.
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A 1.60 g calcium supplement contains 37.8% Ca by mass. The calcium is present in the supplement as CaCO₃(s) (molar mass 100.09 g/mol). How many grams of CaCO₃(s) are in the calcium supplement?
Using the Cell Size and Scale Interactive, tell me which of the following is correct. They are in order of size, left to right, from smallest to largest:
tRNA > influenza virus > E. coli bacterium
Hepatitis virus > hemoglobin > phospholipid
Ribosome > amoeba proteus > carbon atom
Answers
Using the cell size and scale Interactive, the correct order of size, left to right, from smallest to largest is tRNA > influenza virus > E. coli bacterium Hepatitis virus > hemoglobin > phospholipid. The correct option is a.
What is t-RNA?t-RNA is transfer RNA. It helps in transferring information from RNA to DNA or DNA to RNA.
t-RNA is present in viruses, so it will be smaller than the virus because they are present inside the virus. Phospholipids are chains of lipids. They are macromolecules.
Therefore, the correct option is a. tRNA > influenza virus > E. coli bacterium Hepatitis virus > hemoglobin > phospholipid.
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Which example represents a point source of pollution?
O acid rain caused by exhaust from vehicles
O chemical runoff from lawns
O oil and gasoline discharged from cars
heated water released from a power plant
Answers
Answer:
It is pollution that comes from many places, all at once. The United States Environmental Protection Agency (EPA) defines point source pollution as any contaminant that enters the environment from an easily identified and confined place. Examples include smokestacks, discharge pipes, and drainage ditches
A dam constructed to produce tidal power does so by _____. reducing the range between high tide and low tide harnessing water flow to drive turbines and electric generators protecting a coastal area from large ocean waves preventing saltwater from moving from the ocean into a bay
Answers
A dam constructed to produce tidal power does so by harnessing water flow to drive turbines and electric generators .
What purposes does tidal energy serve?Tidal energy was employed in grain mills to crush grains mechanically, just like wind energy was. grain crushing Here, the tidal energy generated by the turbines was used. Hydroelectric dams, which serve as significant energy storage, also employ tidal energy to store energy.
Tidal power can harm marine life because tidal turbines' whirling blades can cause marine organisms to perish. Fish habitations in tidal power settings may be impacted by noise from the turbines' rotation. Tidal energy can also affect how sediment and water are processed.
Therefore, option B is correct.
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Which of the following has the most number of atoms
Answers
Answer:
Explanation:
where is the pic?
Answer:
what are the following? if you can provide them I can try to answer it for you
Explanation:
Which type of reaction is represented by this graph?
Potential energy
Reaction progress
A. Synthesis
B. Endothermic
C. Decomposition
D. Exothermic
Answers
Answer:
D. Exothermic .
Explanation:
Hello there!
In this case, since the potential energy versus reaction progress diagrams are related to the energetic profile of a chemical reaction, we can set the initial point at the beginning of the reaction as the energy of the reactants and the final point as the energy of the products.
Next, since the change in the enthalpy of a reaction is quantified by subtracting products minus reactants, we can see that the products have less energy than the reactants and therefore ΔH for this reaction is negative, which matches with the definition of D. Exothermic reaction.
Regards!
What is a reaction rate?
Answers
Answer:
A reaction rate is generally the speed (or rate) at which a chemical reaction takes place. It is usually expressed in terms of volume or a unit of time.
Answer:
the speed at which a chemical reaction takes place
How many electrons are in a neutral atom of Platinum-196?
Answers
Answer:
9
Explanation: