Answers
Answer:
a.
Explanation:
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Related Questions
3. In the picture, a girl with a weight of 540 N is balancing on
force exerted by the ground on her front wheel is 200 N,h
back wheel?
Answers
Answer:
340 N
Explanation:
Force formula
The force formula is defined by Newton's second law of motion: Force exerted by an object equals mass times acceleration of that object: F = m ⨉ a. To use this formula, you need to use SI units: Newtons for force, kilograms for mass, and meters per second squared for acceleration.
Equilibrium
It is a state of rest or balance due to the equal action of opposing forces. equal balance between any powers, influences, etc.; equality of effect. mental or emotional balance; equanimity: The pressures of the situation caused her to lose her equilibrium.
HELP !! Which statement describes a periodic trend of electronegativity?
A. Electronegativity increases from right to left across a period.
B. Electronegativity increases from left to right across a period.
C. Electronegativity increases from top to bottom of a group.
D. Electronegativity remains the same within a period.
Answers
Answer:
B
Explanation:
Which of the following statements is true?
Answers
Answer:
option first is right answer
names the process which takes place when a red litmus paper turns white when dropped into chlorine water
Answers
Answer:
Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.
Explanation:
Answer:
Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process. If you are considering the colour change only - refer to it as bleaching. If you are considering the reaction mechanism and how the chemicals which provide the colour are changed, then refer to it as oxidation.
Explanation:
Ammonia is produced by the Haber process. The equation is shown.
N2 (g) + 3H2 (g) ⇔ 2NH3 (g)
The forward reaction is exothermic.
Which statement is correct?
Increasing pressure decreases the yield of ammonia, but speeds up the reaction.
Increasing temperature decreases the yield of ammonia, but speeds up the reaction.
Increasing the concentration of hydrogen and nitrogen results in a lower yield of ammonia.
Increasing the temperature increases the yield of ammonia and speeds up the reaction.
Answers
Answer:
option D
Explanation:
Increasing the temperature increases the yield of ammonia and speeds up the reaction as chemical reaction is affected by temperature.
Answer:
increasing the temperature decreases the yield of ammonia but speeds up the reaction
Explanation:
first pressure have no effect in chemical reaction
A student observes that a ray of light bends where it passes from glass into water. What best explains this phenomenon? O The properties of a wave change as it travels from one medium into another. O The energy of a liquid is greater than that of a solid and increases the amount of light in it. O The mass of a ray of light varies in proportion with the density of its surroundings. O A wave consumes energy in a solid but produces energy in a liquid.
Answers
Answer:
The correct answer is - The properties of a wave change as it travels from one medium into another.
Explanation:
The bending of the light from passing through the air into the liquid is called the refraction of the light due to change its direction as it slows down as water is more denser than air with a higher refractive index. They slow and the wavelength decreases but frequency remain same
Specific heat is a common name for which of the following?
Answers
Answer:
heat capacity. (another term used for specific heat)The amount of heat required to raise the temperature of a specified amount of a substance by 1°C or 1 K.
Explanation:
Specific heat is a common name for:
Massic heat capacitySpecific heat is the term that is used to describe the amount of heat which would be sufficient to change the temperature of a unit mass by one degree.
As a result of this, we can see that if the specific heat that is needed to change the temperature of water is found, then it can be easily determined if the water has reached its boiling point.
Therefore, another name for specific heat is also massic heat capacit
Please note that your answer is incomplete and as a result of this, i would be giving you a general overview which should help you get the correct answer.
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A scientist uses a scale of wind speed and barometric pressure to determine the category of a hurricane. According to the data in the table provided, as the barometric pressure continues to fall, the wind speed will
Answers
Whats the question??????????????????/
Which statement is true for nuclear reactions but not for chemical reactions?
O A. The total number of atoms stays the same throughout the
reaction.
B. The nuclei of the atoms are changed by the reaction.
C. The total mass of the products is the same as the total mass of
the reactants.
D. The nuclei of the atoms stay the same throughout the reaction.
Answers
Answer: B. The nuclei of the atoms are changed by the reaction.
Explanation:
The statement which is true for nuclear reactions but not for chemical reactions is that the nuclei of the atoms are changed by the reaction.
There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus or nuclei respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
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What is the molarity of a solution that is made with 3 moles of Na and 2 L of water
Answers
Answer - 1.50 M Na
Explanation -
3.00 moles of Na over 2.00 L of water.
3.00/2.00 = 1.50 M Na
I cannot be entirely sure. But it's an educated guess.
Electrophilic aromatic substitution of furan favors addition to the 2-position because the intermediate cation is more stable than addition to the 3-position. Draw the mechanism arrows for the Friedel-Crafts acylation of furan. In steps 1-3 draw the curved arrows to show the formation of the acyliumion electrophile and acylation of furan. In steps 4 and 5 draw all resonance structures for the intermediate cation, then showing reaction of the last resonance structure with FeCl4 to generate the final product. Make sure to draw lone pairs of electrons for all species and nonzero formal charges.
Answers
Answer:
See picture below
Explanation:
In the attached picture, you have the mechanism of all this reaction.
In the first step, as this is Friedel Craft acylation, we need to use either AlCl₃ or FeCl₃. So, this compound (I will use FeCl₃) will attach to the Chlorine group of the CH₃COCl.
In the second step, the whole CH₃CO is attached to the furan, because of the attack of the double bond of the ring.
After this, it occurs several resonance structure, to give a more stable structure, and the Hydrogen in the 2 position is substracted to give the final product of acylation.
Hope this helps.
For the following, convert the word equation to a formula equation, BUT DO NOT BALANCE
BRAINLIEST AND POINTS PLEASE HELP!
Answers
its d dude this is so easy
Mr. Ragusa asks Hassan to make silver crystals from the following reaction.
2AgNO3 + Cu --> Cu(NO3)2 + 2Ag
Mr. Ragusa gives Hassan 51 g of silver nitrate to conduct the experiment. Hassan gives Mr. Ragusa 20 g of
silver crystals. What was Hassan's percent yield for his experiment?
Please round your answer to 2 decimal places
Answers
Answer:
Percentage yield = 61.7%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated:
2AgNO₃ + Cu —> Cu(NO₃)₂ + 2Ag
Next, we shall determine the mass of AgNO₃ that reacted and the mass of Ag produced from the balanced equation. This is illustrated below:
Molar mass of AgNO₃ = 108 + 14 + (16×3)
= 108 + 14 + 48
= 170 g/mol
Mass of AgNO₃ from the balanced equation = 2 × 170 = 340 g
Molar mass of Ag = 108 g/mol
Mass of Ag from the balanced equation = 2 × 108 = 216 g
SUMMARY:
From the balanced equation above,
340 g of AgNO₃ reacted to produce 216 g of Ag.
Next, we shall determine the theoretical yield of Ag. This can be obtained as follow:
From the balanced equation above,
340 g of AgNO₃ reacted to produce 216 g of Ag.
Therefore, 51 g of AgNO₃ will react to produce = (51 × 216)/340 = 32.4 g of Ag.
Thus, the theoretical yield of Ag is 32.4 g.
Finally, we shall determine the percentage yield of Ag. This can be obtained as follow:
Actual yield = 20 g
Theoretical yield = 32.4 g
Percentage yield =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 20 / 32.4 × 100
Percentage yield = 61.7%
Consider these two entries from a fictional table of standard reduction potentials.
X3++3e−⟶X(s)o=−1.95 V
Y3++3e−⟶Y(s)o=−0.19 V
What is the standard potential of a galvanic (voltaic) cell where X is the anode and Y is the cathode?
Answers
Answer:
+1.76 V
Explanation:
Ecell = Ecathode - Eanode
= -0.19 - (-1.95) = + 1.76 V
The standard potential of a galvanic (voltaic) cell is +1.76 V
How do we calculate the standard electrode potential?Standard electrode potential of galvanic (voltaic) cell will be calculated by using the following equation as:
Ecell = Ecathode - Eanode
Given that, electrode potential of cathode = -0.19 V
Electrode potential of anode = -1.95 V
On putting values in the above equation, we get
Ecell = -0.19 - (-1.95) = +1.76 V
Hence the resultant electrode potential is 1.76V.
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Which of the following statements is a true statement regarding a solution with [H1+] =1x10-5 M and [OH1-]= 1x10-9 M?
A. The [H1+] > [OH1-] and the solution is basic
B. The [H1+] >[OH1-] and the solution is acidic
C. The [OH1-] > [H1+] and the solution is basic
D. The [OH1-] > [H1+] and the solution is acidic
Answers
Answer:
B. The [H1+] >[OH1-] and the solution is acidic
Plzzz someone help me last question
Answers
Answer:
D -35 West
if this is correct plz mark me brainliest because this is my first question
How do you define nitrogen?
Answers
Answer:
nitrogen is a gas
Explanation:
nitrogen is a gas which consists of diatomic molecules and about 78%of it occupies the atmosphere
1. How many grams of potassium chloride (KCI)
can be dissolved at 10°C?
Answers
Answer:
At 10 ∘C , the solubility of potassium chloride is measured to be 31.2⋅g per 100⋅g of water.
Explanation:
EVALUATE
1. How many moles are in 3g of N atoms?
2. How many grams are in 4 moles K?
Answers
Answer:
1. 0.214moles
2. 156g
Explanation:
1. Mole = Mass ÷ molar mass
Molar mass of N = 14g/lol
mole = 3/14
mole of N = 0.214mol
2. mole = mass ÷ molar mass
Molar mass of K = 39g/mol
4 = mass/39
mass = 39 × 4
mass = 156g.
Ionisation enthalpy across the group (increase or decrease)
Give reasons??
Answers
Answer:
As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.
Answer:
[tex]\huge\boxed{Answer\hookleftarrow}[/tex]
Ionization enthalpy (IE) is the energy required to remove the highest-energy electron from a neutral atom. In general, ionization energy increases across a period and decreases down a group.So, for your question ⇻ IE decreases down the group.____________________
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# ꧁❣ RainbowSalt2²2² ࿐
I give brainliest
Why is the number of hours of daylight different in the summer for two regions located at different latitudes in the Northern Hemisphere?
Answers
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the differences in the path of the Sun and in sunrise and sunset times are due to the Earth's orbit on its axis and the Earth's curvature.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. The differences in the path of the Sun and in sunrise and sunset times are due to the Earth's orbit on its axis and the Earth's curvature.
Therefore, the differences in the path of the Sun and in sunrise and sunset times are due to the Earth's orbit on its axis and the Earth's curvature.
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Answer has to be in two significant figures
Answers
Answer: 2.186 m
Explanation:
formula for molality: (mol solute)/(kg solvent)
Na2CO3 = solute
510g Na2CO3 * ( 1 mol / 106 g) = 4.811 mol solute
ethylene glycol = solvent
2.2 * 10^3 g * ( 1 kg / 1000 g) = 2.2 kg
(4.811/2.2) = 2.186
Which molecule is used as a primary energy source by our bodies?
Answers
9. How much power is flowing into your house if the voltage is 120 V and the current is 50 A? Use the formula P = VI.
O A. 1200 Watts
O B. 240 Watts
O C. 6000 Watts
O D. 4800 Watts
Answers
Which statements comparing the Sun and a red supergiant are true? Select the two correct answers.(1 point)
The Sun and a red supergiant have similar luminosity.
The Sun and a red supergiant are of similar size.
The Sun's temperature is higher than that of a red supergiant.
The Sun will outlive a red supergiant.
Answers
Answer:
The sun will outlive the red supergiant and The Sun's temperature is higher than that of a red supergiant.
Explanation:
Just took the quiz
what is a characteristic of property acids pls help
Answers
Answer:
General Characteristics of Acids:
Sour taste (though you should never use this characteristic to identify an acid in the lab) Reacts with a metal to form hydrogen gas. Increases the H+ concentration in water. Donates H+ ions. Turns blue litmus indicator red.
also turns blue litmus red
How can you find density mathematically ?
Answers
Answer:
d=m/v
Explanation:
density equals mass over volume. you take your mass and put it in the numerator and your volume in the denominator. You then divide the numbers and round to the nearest tenth or hundredth.
Which of the following polyatomic ions will form an ionic compound with a single sodium ion?
CO3 2-
HCO3 1-
SO4 2-
SO3 2-
Answers
Answer:
Option B, HCO3 1-
Explanation:
The valence of Sodium ion is +1 and the valence of HCO3 is -1. Thus, sodium ion has an extra electron to be donated to complete its outer shell while HCO3 needs an electron to complete its outer shell
Hence Na will combine with HCO3 to form NaHCO3
Option B is correct
The polyatomic ion which will form an ionic compound with a single sodium ion is; HCO3 ¹-
In chemical bonding between ions;
The major criteria is a balance of charges within the compound formed.
As such, all polyatomic ions in the option are di-ionic except for HCO3 1- which can perfectly form an ionic compound with 1 single sodium ion.
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An aqueous solution was made by dissolving 0.543 g of an unknown, monoprotic acid into 25.00 mL of water in an Erlenmeyer flask. After an acid/base indicator was added, 41.21 mL of 0.150 M NaOH was used to reach the end point.
a)Find the molar mass of the acid.
b)Determine the identity of the acid based on the following data:
PLEASE HELP ME
Answers
Answer:
a. 87.8g/mol is the molar mass of the acid.
b. The answer is in the explanation.
Explanation:
To solve this question we must find the moles of the monoprotic acid using the reaction with NaOH (1mole of monoprotic acid reacts with 1 mole of NaOH). With the moles and the mass of the unknown we can find the molar mass.
Moles of NaOH added:
0.04121L * (0.150moles / L) = 6.1815x10⁻³ moles NaOH = Moles monoprotic acid
Molar mass is:
0.543g / 6.1815x10⁻³ moles = 87.8g/mol is the molar mass of the acid
b. I can't see the image you are giving because has a low resolution. But the identity of the acid can be obtained because the acid:
Has the same molar mass.
Is a monoprotic acid.
(a) The molecular mass of the unknown monoprotic acid will be 87.84 g/moles.
(b) The acid can be butyric acid, as it is a monoprotic and have mass near about 87.84 g/mol.
(a) The endpoint by the addition of NaOH has been reached when the monoprotic acid has been completely utilized. Since the NaOH has been monobasic. The moles of NaOH will be equal to the moles of acid.
Moles of NaOH = moles of acid
The molarity of NaOH = 0.15 M
Volume of NaOH = 41.21 ml
Molarity = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]
Moles = molarity [tex]\times[/tex] volume (L)
Moles of NaOH = 0.15 [tex]\times[/tex] 0.04121 L
Moles of NaOH = 0.00618 moles
Moles of NaOH = moles of acid
moles of acid = 0.00618 moles.
Mass of acid dissolved = 0.543 grams
Molecular weight of acid = [tex]\rm \dfrac{weight}{moles}[/tex]
Molecular weight of acid = [tex]\rm \dfrac{0.543}{0.006815}[/tex]
Molecular weight of acid = 87.84 g/moles.
(b) The acid with the molecular mass of 87.84 g/mol with being the monoprotic acid can be butyric acid. The butyric acid has a molecular weight of 88 g/mol.
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Which of the following terms describes a transfer of energy?
a. internal energy
b. heat
c. temperature
d. kinetic energy
Answers
The term that best describes the process of transfer of energy is known as heat. Thus, the correct option for this question is B.
What is the transfer of energy?The process of transfer of energy is known as conduction. It occurs when a significant amount of energy can be transferred or migrated between two or more objects in a closed system where the term heat involves the transfer of thermal energy.
Heat represents the process of transfer of energy from one source to another in a thermodynamic system. It significantly involves the mechanism that constitutes other thermodynamic work in order to reveal the transfer of energy into matter.
Therefore, heat is the term that best describes the process of transfer of energy. Thus, the correct option for this question is B.
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