Answer:
Charges that are opposite each other, such as positive and negative charges, draw each other. Like charges repel each other, such as two negative charges or two positive charges.
Explanation:
Answer:
Opposite electric forces attract each other.
Like if it's positive and negative they will come together.
If they are the same(positive and positive or negative and negative) they will repel each other.
Explanation:
What is a flame test?
A. A method for determining the products of combustion
B. A method of obtaining an emission spectrum from a sample
C. A method for testing the flammability of a sample
D. A method for determining the temperature of combustion
SUBMIT
Answer:
B. A method of obtaining an emission spectrum from a sample
Explanation:
Flame test is a method of obtaining an emission spectrum from a sample.
Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.
Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.Flame test is characteristic for each element as that of an emission spectrum.
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Carbon forms triple bonds with other carbon atoms in the
compound named
a ethane.
bethene.
C ethyne.
d two of the above
Answer:
C
Explanation:
In carbon- to- carbon compounds like ethyne,carbon forms triple bond with each otherCarbon forms triple bonds will form triple bonds with other carbon and forms ethyne. The triple bonded hydrocarbons are commonly called as alkynes. Hence, option C ethyne is correct.
What are alkynes?Carbon forms bond with other carbons and exhibit the property of catenation to form long chains. The backbone of hydrocarbons are the carbon - carbon bonds.
There are three types of hydrocarbons namely, alkanes, alkenes and alkynes. Alkanes are saturated hydrocarbon having single bond between carbon atoms. Eg. methane , ethane etc all having suffix of 'ane'. Alkenes are unsaturated hydrocarbons with double bond between two or more carbon atoms.
Alkenes are named with the suffix 'ene'. Hence, the names become ethene, propene etc. When triple bonds forms between carbon atoms they are called alkynes and are unsaturated. Alkynes are named with the suffix 'yne' like ethyne, propyne etc.. Hence, two carbon with triple bond between them is ethyne.
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Why is important for plants that all ammonium, nitrate and nitrite compounds are soluble
in water?
Answer:
Nitrites can be reduced to form nitrogen. Almost all nitrate salts are soluble in water. Almost nitrate are soluble in water and slightly soluble in primary alcohols. The oxidation number of nitrogen in the nitrates is +5. The oxidation number of nitrogen in nitrates is +3.
Explanation:
Ammonium nitrate readily dissolves in water by dissociating into its respective ions. This salt is acidic in nature. Ammonium nitrate is an important fertilizer required for the growth of plants.
Why ammonium nitrate needed for plants?The nitrogen is the most usually used limiting supplement in the development of crops. Nitrogen is essential for the vegetative development and it is involved in creating food through photosynthesis. The use of ammonium nitrate is the best way to provide nitrogen for the plants.
It is very essential to convert nitrogen into nitrate, in order to be used by the plants. The ammonium nitrate and nitrite are highly stable than urea and does not rapidly lose nitrogen to the atmosphere. So both the nitrites and nitrates of ammonium are soluble in water and plants can easily absorb them.
So ammonium nitrate has high nutrient content.
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The pressure in a bicycle tire is 1.34atm at 33.0 ° C. At what temperature will the pressure inside the tire be 1.60atm?
Answer:
92.37°C
Explanation:
Assuming the volume remains the same in both the states ( bicycle tire).
Then as per ideal gas equation
[tex]P_1/T_1 = P_2/T_2[/tex]
where P1, P2 are pressure at two different states and T1, T2 are temperature at these two states
Given:
P1 = 1.34 atm, T1 = 33.0 ° C = 306K
P2 = 1.60 atm, T2 = ?
1.34/306 = 1.60/T_2
⇒ T2 = 1.60×306/1.34
= T2= 365.37K= 92.37°C
chemistry:
plz help me:D
Answer:
the amswer to number 5 is 18g/ mol and the answer to number 6 is 8
A family is driving to a nearby city. If they traveled 224.4 miles for 3.3 hours how fast were they traveling?
What happens when you change the number of protons keeping the numbers of other particles the same?
Answer:
See explanation
Explanation:
The atomic number refers to the number of protons in the nucleus of an atom. We identify an element by its atomic number.
When the atomic number of an atom of an element is changed, we have changed the identity of that atom and transformed it into an atom of a different element.
For example, if we add a proton to a sodium atom, we create a magnesium atom. If we remove a proton from a sodium atom, we create a neon atom.
1.What is the maximum amount of the substance that will dissolve in 100 3
cm of water at 30°C?
A. 25 g
B. 33 g
C. 57 g
D. 125 g
2. The graph shows the solubility curve of an unknown salt. The four points on the diagram represent four solutions of the unknown salt.
Which point represents a supersaturated solution of the unknown salt? A. Q
B. R
C. S
D. T
3. The illustration below lists the pH of various substances.
Which of the following substances is the closest to a neutral pH?
A. milk
B. vinegar
C. ammonia
D. milk of magnesia
4. The figure below shows where solution X and solution Y fall on the pH scale.
Which statement correctly compares solutions X and Y?
-
A. Solution X has a higher concentration of hydroxide ions (OH ) than
solution Y.
3+
B. Solution X has a higher concentration of hydronium ions (H O ) than solution Y.
3+
C. Solution X and Y have equal numbers of hydronium (H O ) and
-
hydroxide (OH ) ions.
3+
D. Solution Y has a higher concentration of hydronium ions (H O ) than solution X.
5. The graph below shows the amount of salt that dissolves in 100
milliliters (mL) of water at various temperatures.
Based on the graph, what is the likely amount of salt that will dissolve in 200 mL of water at 90°C?
A. 35 grams
B. 40 grams
C. 80 grams
D. 100 grams
6. The graphic shows sugar in a cup before and after it has dissolved.
Which action most likely occurred in order for the sugar to dissolve?
A. The water was stirred.
B. The sugar was cooled.
C. The sugar settled to the bottom.
D. The water evaporated from the top.
7. Look closely at the illustration below showing where the compound
sodium hydroxide falls on the pH scale.
What type of compound is sodium hydroxide?
A. acid
B. base
C. element
D. salt
8.The graph shows the solubility of carbon dioxide (CO ) in water at
different temperatures.
Explain how temperature affects the solubility of carbon dioxide in water.
9.The graph shows solubility curves for four salts across different
Temperatures.
How many grams of NaCl will dissolve in 100 grams of water at 100°C?
A. 10 g
B. 33 g
C. 40 g
D. 42 g
10. The graphic shows an investigation being performed by four students.
Each student will pour 10 grams of sugar into 100 milliliters of water into
his or her container. They will stir the water gently for 20 seconds. Which
student's sugar will most likely dissolve the fastest?
A. Jennie
B. Al
C. Adriane
D. Marcus
11.Which of the following is NOT a way to increase the solubility of a solid
in water?
A. crushing the solid
B. shaking the mixture of solid and water
C. raising the temperature of the water
D. letting the mixture stand still a long time
12.The dissolved substance in a solution is the
A. solute.
B. solvent.
C. tincture.
D. suspension.
13.Which of the following refers to the concentration of a substance?
A. the size of the particles that make up a substance
B. the grams of solute dissolved per 100 g of solvent
C. the minimum volume of solvent dissolved per liter of solution at a
given pressure
D. the maximum amount of a solute that can be dissolved in a solvent
at a given temperature
14.A soil sample with a pH of 4.5 is
A. neutral.
B. acidic.
C. basic.
D. inconclusive.
15.Which of the following combinations would create the fastest chemical
reactions?
A. a whole antacid tablet and vinegar at 25 degrees Celsius
B. a whole antacid tablet and vinegar at 50 degrees Celsius
C. a crushed antacid tablet and vinegar at 25 degrees Celsius
D. a crushed antacid tablet and vinegar at 50 degrees Celsius
16.What substances change color when added to acids or bases?
A. indicators
B. electrolytes
C. insulators
D. capacitors
17.The table below shows four solutions that were prepared by dissolving
salt in water.
Which of the solutions has the highest salt concentration?
A. Solution A
B. Solution B
C. Solution C
D. Solution D
Answer:
FOr question 5, the answer is 80 gramas.
Explanation: According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.
(Will come back later for edits)
According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.
What does the graph shows?The graph shows the solubility curve of an unknown salt. The four points on the diagram represent four solutions of the unknown salt.The ratio of a constituent's abundance to the total volume of a mixture is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.
Salt in freshwater is less than that in salt water, and the concentration of salt in the Dead Sea is greater than the concentration of salt in the oceans. The Dead Sea has a salinity of 33.7 percent, and the second-saltiest lake in the world is the Dead Sea.
Therefore, According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.
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a piece of debris travelling through space which ranges in size from a grain of sand to over 100ft in diameter
Answer:
Meteoroids are tiny asteroids or the broken-off crumbs of comets and sometimes planets. They range in size from a grain of sand to boulders 3 feet (1 meter) wide. When meteoroids collide with a planet's atmosphere, they become meteors
pls give me brainliest lol :)
How many pennies do you need to stack for them to be as tall as a 2,300 mm door?
(1 penny = 1.52 mm)
*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Answer: 1513.15789 Pennies
Explanation:
2300 / 1.52 = 1513.15789
I hope this helped!
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What kind of energy is being transformed???
Answer:
Kinetic Energy
Explanation:
When we run we are using chemical energy in our bodies to produce movement ( kinetic energy ) .
Which statement describes particles of an ideal gas, based on the kinetic molecular theory?
Answer:
There are 5 steps/rules of the ideal gases based on kinetic theory.
Explanation:
1. Particles in a gas are constant moving in random motion.
2. combined volume of the particles is negligible.
3. particles exert no forces on one another
4. any collisions between the particles are completely elastic
5. the average kinetic energy of particles is proportional to temperature in kelvins.
(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)
A man pulled a food cart 4.5 m to the right for 15 seconds. What is the average speed of the food cart to the nearest tenth of a m/s?
The average speed of the food cart to the nearest tenth of a m/s is 0.3 meter per second.
How do we calculate speed?Speed of any moving body will be calculated by using the below formula as:
Speed = Distance / Time
Given that, Distance travelled to the right side = 4.5m
Time to travel = 15 sec
On putting values on the above equation, we get
Speed = 4.5 / 15 = 0.3 m/s
Hence required speed is 0.3m/sec.
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How many moles are present in 5.67x1025 atoms of Carbon (C)?
Answer:
94 moles of Carbon
Explanation:
From the question,
Using Avogadro's constant
1 mole of every element contains 6.03×10²³ atoms of the element
If 1 mole of Carbon contains 6.03×10²³ atoms of Carbon,
Then, x mole of Carbon will contain 5.67×10²⁵ atoms of Carbon
1 mole of C ⇒ 6.03×10²³ atoms of C
x mole of C ⇒ 5.67×10²⁵ atoms of C
solve for x
x = (1× 5.67×10²⁵)/6.03×10²³
x = 94.03 moles of Carbon
x ≈ 94 moles of Carbon
the transfer of thermal energy that causes a metal spoon in hot liquid to get hot.
Answer:
Conduction
Explanation:
Conduction can be regarded as transfer of thermal energy which exist
between two or more objects that are in contact with each other. From the question, the spoon touches the hot liquid and heat is transferred to the spoon through conduction
The H-R diagram is useful in
studying all of these about a star
A.except for its brightness b.location in the sky c.temperature
D.magnitude
Answer:
b.location in the sky (If the question is saying:The H-R diagram is useful in
studying all of these about a star except for)
Explanation:
The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.
In the reaction shown, 88.388.3 g salicylic acid, C7H6O3C7H6O3 , reacts with excess acetic anhydride, C4H6O3C4H6O3 , producing 62.062.0 g of aspirin, C9H8O4C9H8O4 . C7H6O3(s)+C4H6O3(l)⟶C9H8O4(s)+CH3CO2H(l) C7H6O3(s)+C4H6O3(l)⟶C9H8O4(s)+CH3CO2H(l) Calculate the percent yield of this reaction
Answer:
53.9%
Explanation:
The equation of the reaction is;
C4H6O3+C7H6O3→C9H8O4+C2H4O2
Number of moles of salicyclic acid reacted = 88.3 g/138.121 g/mol = 0.639 moles
1 mole of salicyclic acid yields 1 mole of aspirin
0.639 moles of salicyclic acid also yields 0.639 moles of asprin
Theoretical yield of asprin = 0.639 moles * 180.158 g/mol
Theoretical yield of asprin = 115.12 g
Percent yield = Actual yield/Theoretical yield * 100/1
Percent yield = 62.0 g/115.12 g * 100
Percent yield = 53.9%
A sample of gas occupies 2.30 L at 825 mmHg and 70.0°C. What is its volume at STP
Answer:
V₂ = 2.0 Liters at STP conditions
Explanation:
Solving problem using the combined gas law
Given:
Case I Conditions Cast II Conditions
P₁ = 825mmHg P₂ = 760mm
V₁ = 2.30 Liters V₂ = ?
T₁ = 70°C + 273 = 343K T₂ = 0°C = 273K
Substitute into combined gas law assuming moles of gas remains constant; solve for unknown volume under case 2 conditions
P₁·V₁/n₁·T₁ = P₂·V₂/n₂T₂ => V₂ = P₁·V₁·T₂ / P₂·T₁ => note: in this solution, moles of gas remains constant as is disregarded in final calculation.
V₂ = (825mm)(2.3L)(273K) / (760mm)(343K) = 1.987 Liters (calculator answer) ≅ 1.9 Liters (2 sig figs based on given volume (V₁)
V₂ = 1.987 Liters ≅ 2.0 Liters (2 sig figs based on given volume (V₁)
How many grams of carbon dioxide would be produced if we use 35 grams of methane in the reaction below? CH4 +2O2---- Co2 + 2H2O
Answer:
96g of CO₂ would be produced
Explanation:
Based on the reaction:
CH₄ + 2O₂ → CO₂ + 2H₂O
1 moles of methane, CH₄ produces 1 mole of carbon dioxide, CO₂.
To solve this question we must find the moles of methane added in the reaction. These moles added are equal to moles of CO₂ produced. With the molar mass of CO₂ (44.01g/mol) we can find the grams that would be produced:
Moles CH₄ -Molar mass: 16.04g/mol-:
35g * (1mol / 16.04g) = 2.182 moles of CH₄ are added = Moles CO₂ produced.
Mass CO₂ produced.
2.182 moles CO₂ * (44.01g / mol) =
96g of CO₂ would be producedcan someone at least help with one of these i will give brainliest
Answer:
1375 J/kg.°C
Explanation:
From the question First question,
Q = cm(Δt)................... Equation 1
Where Q = Heat released, c = specific heat capacity of the unknown metal, m = mass of the unknown metal, Δt = Change in temperature.
make c the subject of the equation
c = Q/mΔt.................. Equation 2
Given: Q = -5500 J (Since heat is released, Q is negative), m = 200 g = 0.2 kg, Δt = 10-30 = -20°C
Substitite these values into equation 2
c = -5500/[0.2×(-20)]
c = -5500/-4
c = 1375 J/kg.°C
Calculate the approximate volume of a 1.50 mol sample of gas at 15.0°C and a pressure of 3.75 atm
Answer
F 1.73 L
G 5.93 L
H 8.65 L
J 9.46 L
Answer:
The answer is J (9.46 L)
what are the possible
phenotypels for the offspring when you cross two heterozygous pink flowers? *
Answer:
the phenotype of the offspring will be pink
When a car starts rusting where there is a scratch on the paint, a redox reaction is happening
TRUE OR FALSE
Answer:
it is true
Explanation:
hope it helps :)
Answer: I think it is true
Explanation:
it is true because it will start rusting when there is a scratch on the paint!
I HOPE THIS HELPS YOU!!
Freshwater makes up about 90% of the Earth's surface.
Answer:
what is your question?
Explanation:
I don't understand
THIS IS FOR SCIENCE PLS HELP ME WRITE MY PROMPT How does the human population and human activity affect Earth?
using details and examples from the text explain how the digestive system helps your body obtain the energy it needs
Answer:
Explanation:
What is a sensitive device used to detect magnetic fields on the seafloor?
A. seismometer
B. geologist's compass
C. Glomar
D. magnetometer
Answer:
D. Magnetometer
Explanation:
A magnetometer is a device that measures magnetic field or magnetic dipole moment. Some magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location.
4. What was the original volume of a gas that expanded to 25
temperature change from 1 to 10 degrees Celsius?
Which statement is false? *
a.) Pressure must be exerted on a sample of a gas in order to confine it.
b.) Gases diffuse into each other and mix almost immediately when put into the same
container.
c.) The molecular weight of a gaseous compound is a non-variable quantity
d.) Gases can be expanded without limit.
e.) The density of a gas is constant as long as its temperature remains constant.
Answer:
d.) gases can be expanded without limit.
how is water treated for human use
Answer:
the water is first screened then filtered to remove undesolvable objects then passed into the sedimentation tank which is again filtered after leaving the tank. Chlorine is then added to the fine filtered water to kill viruses and bacteria. now the water is clean hope i ave help u enough
Explanation: