Answer: Alex should get 300 Calories from carbohydrates, which is about 33 grams. This snack is almost 70% of her total grams of carbohydrates per day.
Answer:
B
Explanation:
I think
Which element is undergoing reduction?
1 Ag
2 Ag+
3 Pb
4 Pb+2
Answer:
Ag is under going reduction
which is not a correct ion?
li2+
cl-
Al3
O2-
Answer:
The answer is option 1.
Explanation:
Lithium is a Group 1 element. So the correct charge for lithium should be Li+.
Answer:
(a)[tex]Li^{2+}[/tex]
Explanation:
Answer is (a)[tex]Li^{2+}[/tex]
As lithium has only one valence electron, it will lose one electron to form a cation with charge 1+ . Thus the correct Li ion is [tex]Li^{1+}[/tex]
The type of substance has a pH lower than 7. They turn litmus paper red. They are sour and sharp-tasting. They react with metals. This type of substance is a...
1. Acid
2.Base
3. Neutral substance
Please help lol
The answer is Acid
Explanation:
It's acid, because from its definition we can say that acid turns blue litmus paper red, and it is also corrosive and has a sour taste.
Coming to the pH scale, which is a measure of the acidity and alkalinity of s substance.It is said to be acidic between the range of 1 - 6.9 and neutral at 7, and alkaline between the range of 7.1 - 14You can bake food in either a metal pan or an oven safe glass. Which would require more energy to heat up? Which would cool down the fastest? Explain your reasoning.
The kind of material used to bake food will influence how much energy is required to heat it up and how quickly it cools. Due to the fact that metal conducts heat more effectively than glass, heating up metal pans often takes longer than heating up glass ovenware.
What is the behavior of metal with the heat ?This implies that the metal absorbs heat from the oven more rapidly and effectively, needing more energy to attain the appropriate temperature. However, oven-safe glass will cool down more quickly than metal.
This is due to the fact that glass is a poor heat conductor, which means it takes more time for the heat to be absorbed by the glass. The glass will shatter after the dish is cooked and the heat is turned off.As the heat takes longer to dissipate, the metal cools down more quickly than the other materials.
In conclusion, glass cools more quickly than metal and requires less energy to heat up than oven-safe metal. This is because metal absorbs heat from the oven more rapidly and effectively than glass since metal is a stronger heat conductor than glass.
However, because glass is a poor conductor of heat, it takes longer for the food to cook and the heat to be absorbed. The glass cools down more quickly than the metal when the heat is gone.
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What is the final pH value of the solution at the end of the titration between strong acids and bases? Explain why that happens.
Answer:
pH of 7 (neutral)
Explanation:
At end of titration or equivalence point (point where you have added equal molar amounts of acids and bases) , the pH is 7.0 because the solution only contains water and a salt (which is a main characteristic of acid and base titrations/reactions).
The reason we only have water and salt is because H+ from acids neutralize OH- molecules in the solution, making water (which is neutral) and the salt does not affect the pH.
Since at equivalence point nor H+ or OH- reigns supreme (that is both are at equal molarity/concentration) the pH is neutral. The pH would be acidic or basic depending on if H+ was high or low, but here H+ is equal with OH- thus pH is neutral.
choose the correct structural formula for the alcohol formed in this reaction
Answer:
The formula is CnH2n+1OH
Explanation:
The Kelvin temperature of sample of 650 cm sample of ammonia gas is doubled what is the new volume of the gas
Answer:
1300cm3.
Explanation:
Step 1:
Data obtained from the question.
Initial temperature (T1) = K
Initial volume (V1) = 650 cm3
Final temperature (T2) = double the original = 2K
Final volume (V2) =..?
Step 2:
Determination of the new volume of the gas.
The new volume of the gas can be obtained by using Charles' law as follow:
V1/T1 = V2/T2
650/K = V2/2K
Cross multiply
K x V2 = 650 x 2K
Divide both side by K
V2 = 650 x 2K /K
V2 = 650 x 2
V2 = 1300cm3.
Therefore, the new volume of the gas is 1300cm3
The new volume of the gas is 1300cm³.
Calculation for volume:Given:
Initial temperature (T₁) = K
Initial volume (V₁) = 650 cm3
Final temperature (T₂) = double the original = 2K
To find:
Final volume (V₂) =?
Determination of new volume:
V₁/T₁ = V₂/T₂
650/K = V₂/2K
K x V₂ = 650 x 2K
V₂ = 650 x 2K /K
V₂ = 650 x 2
V₂ = 1300cm³
Therefore, the new volume of the gas is 1300cm³.
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What does the electronegativity of an atom indicate?
O A. The energy required to gain or lose an electron
O B. The tendency of the atom to pull on electrons
O c. The measurement of the charge of an ion
O D. The effect the valence electrons have on core electrons
Answer:
b) the tendency of the atom to pull on electrons
Explanation:
a p e x
B. The tendency of the atom to pull on electrons. The electronegativity of an atom indicates its tendency to attract and pull electrons towards itself when it is part of a chemical bond.
It gauges how well an atom can draw and hold onto electrons in a chemical connection. In the periodic chart, electronegativity rises over a period (from left to right) and falls within a group (from top to bottom).
In a covalent bond, atoms with high electronegativity pull the shared electrons closer to their nucleus due to their higher attraction to electrons. The pull for electrons is weaker for atoms with low electronegativity, and thus are more prone to shed electrons to create positive ions during ionic bonding.
The difference in electronegativity between the two atoms in a bond also influences the kind of bond that is created. A strong difference in electronegativity will likely result in the formation of an ionic bond.
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1. X is a crystalline salt.On exposure to air ,there is a loss in mass of x (a)suggest a phenomenon exhibited by x. (b)mention 2 salts that x could be. 2 a)Define salt hydrolysis b)mention 2 examples of salts that produce alkaline solutions when dissolve in water.
Answer:
1. a) Crystalline hydrated salt lose their mass or moisture on exposure to the air and change into amorphous salt, the phenomenon is called efflorescence.
b) Two salts that x could be are gypsum (Caso4.H2O) and copper (II) sulfate (CuSO4.H2O).
Gypsum (Caso4.H2O) form anhydrite(CaSO4), when exposed to air and copper (II) sulfate (CuSO4.H2O) form a white layer of anhydrous copper (II) Sulfate when expose to sir.
2. a) Salt hydrolysis is defined as the ions from salts react with water and form either basic or an acidic solution.
b) Two examples of salts that produce alkaline solutions when dissolving in water are sodium bicarbonate (NaHCO3) and Calcium Carbonate (CaCO3).
90 grams of glucose, C6H12O6, is dissolved in 2 liters of solution. Determine the molarity (M).
Answer:
0.25
Explanation:
The first step is to determine how many moles of glucose there are, which means first finding out the molar mass of glucose. Carbon has a molar mass of about 12, hydrogen 1, and oxygen 16, so the total molar mass of glucose is about 6(12)+12(1)+6(16)=180 grams. This means that 90 grams is half a mole. Half a mole of substance divided by two liters of solution is (1/2)/2=1/4, or a molarity of 0.25. Hope this helps!
If you travel southeast from one city to another city that is 314 km away, and the trip takes you 4.0 hours, what is your average velocity?
Answer:
v = 78.5 km/h
Explanation:
It is given that, the distance between one city to another is 314 km. The overall trip takes 4 hours. We need ton find average velocity. It is equal to the total displacement divided by total time taken. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{314\ km}{4\ h}\\\\v=78.5\ km/h[/tex]
So, average velocity is 78.5 km/h.
A) Cu2+ + Bu?
Chemical Formula =
CuBuz
(Need 2 anions and 1 cation)
B) Fe2+
+02
Chemical Formula =
Feo
(Need 1 of each)
C) Fe3+ + Brl-
Chemical Formula =
(Need 3 anions and 1 cation)
D) Kl+ + S2-
Chemical Formula =
(Need 1 anion and 2 cations)
E) Ba2+ + O2-
Chemical Formula =
(Need 1 of each)
(Need 3 anions and 2 cations)
Fe2(SO3)3
(Need 1 anion and 2 cations)
(Need 1 of each)
(Need 1 anion and 2 cations)
F) Cr3+ + O2
Chemical Formula =
G) Fe3+ + (SO3)2- Chemical Formula =
H) Ca2+ + (SO3)2- Chemical Formula =
1) (NH2)++ +52- Chemical Formula =
) Mg2+ + Cl2 Chemical Formula =
K) AM+ +52
Chemical Formula =
L) Na+ + (CO3)2+ Chemical Formula =
M) Ba2+ + (PO4)3- Chemical Formula =
Answer:
I and K cannot be intepreted. I think theres something wrong in the scanning. Besides that i hope this helps
how many total bonds does carbon form with oxygen in carbon dioxide?
Answer:
2 bonds
Explanation:
because carbon dioxides is CO2
the carbon bond to the oxygen
then the same carbon to another oxygen making CO2
How do we know that K2CrO4 and Ba(NO3)2 are not solids?
TRUE OR FALSE
Measurement of the position and velocity of a particle cannot be measured simultaneously with the same precision and accuracy.
Answer:
True.
Explanation:
To describe the problem of trying to locate a subatomic particle that behaves like a wave, Werner Heisenberg formulated what is now known as the Heisenberg uncertainty principle: it is impossible to know simultaneously both the momentum p (defined as mass times velocity) and the position of a particle with certainty.
Making measurement of the momentum of a particle more precise means that the position must become correspondingly less precise. Similarly, if the position of the particle is known more precisely, its momentum measurement must become less precise.
The combustion of hydrogen and oxygen is commonly used to
power rocket engines:
2H2 (g) + O2 (g) → 2H20 (g)
If the final pressure of water vapor was 0.875 atm and the
temperature is 400. K, how many mols of H2O was produced
assuming that the reaction went to completion in a 250.L
engine?
mol
Answer:
6.66 mol
Explanation:
(atm x L) ÷ (0.0821 x K)
(0.875 x 250) ÷ (0.0821 x 400)
=6.66108
Para mejorar la combustión de la gasolina sin plomo se utiliza metanol ( CH3OH ) como aditivo, el cual reduce las emisiones nocivas de los vehículos. Calcular la cantidad de mililitros de agua ( densidad = 1 g/mL ) que se necesitan para preparar una disolución 4.12 molal, con 56.07 gramos de metanol.
Answer:
V = 426.76 mL
Explanation:
Para realizar este ejercicio, necesitas aplicar la siguiente expresion:
m = moles soluto / kg solvente (1)
donde:
m: molalidad.
Ahora bien, tenemos la molalidad de la solución la cual es 4.12 m y la masa de metanol que es 56.07 g. Obviamente, el agua es un solvente universal, por lo tanto en esta disolución, el soluto es el metanol y el solvente el agua.
Sabiendo eso, necesitamos ahora calcular los moles de soluto. Para ello usamos la siguiente expresión:
moles = masa / PM (2)
El peso molecular, es la suma de todos los pesos atómicos involucrados en el compuesto. En el caso del metanol que es CH3OH, los pesos atómicos son:
C = 12 g/mol; H = 1 g/mol ; O = 16 g/mol
Calculemos entonces el peso molecular:
PM = 12 + (4*1) + 16 = 32 g/mol
Con este valor, podemos calcular los moles de metanol o soluto:
moles = 56.07 / 32
moles soluto = 1.75 moles de metanol
Ahora usamos la expresión (1), para despejar los kg de solvente y quedaría:
kg solvente = moles soluto / m (3)
Reemplazamos los valores obtenidos y calculamos la masa de solvente en kilogramos:
kg agua = 1.75 / 4.12
kg agua = 0.42476 kg
Si este valor lo llevamos a gramos, que es simplemente multiplicar por 1000 o correr la coma 3 espacios a la derecha, tenemos:
masa de agua = 0.42476 * 1000 = 424.76 g
Finalmente, si la densidad del agua es 1 g/mL significa que el volumen de agua es igual a la masa de agua, por lo tanto
V = 426.76 mLY esta es la cantidad en mililitros de agua que se necesitan para preparar esta disolución con esa concentración.
2KMnO4= K2MnO4+ MnO2+O2 how many grams of KMnO4 are required to produce 1.60 grams of O2
Answer: 15.8 g of [tex]KMnO_4[/tex] will be required to produce 1.60 grams of [tex]O_2[/tex]
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} O_2=\frac{1.60g}{32g/mol}=0.05moles[/tex]
[tex]2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2[/tex]
According to stoichiometry :
As 1 mole of [tex]O_2[/tex] is given by = 2 moles of [tex]KMnO_4[/tex]
Thus 0.05 moles of [tex]O_2[/tex] is given by =[tex]\frac{2}{1}\times 0.05=0.10moles[/tex] of [tex]KMnO_4[/tex]
Mass of [tex]KMnO_4=moles\times {\text {Molar mass}}=0.10moles\times 158g/mol=15.8g[/tex]
Thus 15.8 g of [tex]KMnO_4[/tex] will be required to produce 1.60 grams of [tex]O_2[/tex]
According to the Law of the Conservation of Matter, if you dissolve 25 grams of sugar into 150 grams of water, the mixture should weigh how much?
Answer:
According to the law of conservation of matter, the mixture should weigh 175 g
Explanation:
The law of conservation of matter is one of the basic guiding principles of chemical reactions.
It states that matter is neither created nor destroyed but can be converted from one form to another.
Although this law has been faulted with advances in science and technology, it is still found basically useful.
So applying the law to the question at hand, it is expected that all the mass of the sugar gets added to all the mass of the water
This brings the total mass to 25 + 150 = 175 grams
The weight of the mixture of sugar and water has been 175 grams.
The law of conservation of mass has been based on the fact that the mass has neither been created and nor destroyed.
The law of conservation of mass stated the combination of the two compounds results in the final solution being the sum of the two reactants.
For example, the mass of a solution of compounds A and B will be:
Mass of A + Mass of B = Mass of solution
The sugar solution formed has been consisted of:
Sugar = 25 grams
Water = 150 grams.
According to the law of conservation of mass, the weight of the mixture has been:
Weight of mixture = Weight of sugar + Weight of water
Weight of mixture = 25 grams + 150 grams
Weight of mixture = 175 grams.
The weight of the mixture of sugar and water has been 175 grams.
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Give one possible explanation for the car’s distance from the starting location at 9:00 a.m. and at 9:30 a.m.
Answer:
Temporary road closure or coffee break
Explanation:
Assume a car started on a trip at 08:00 and the graph below shows the total distance it travelled every half-hour.
We see that after 1 h (at 09:00) the car was a certain distance from the start.
A half-hour later (at 09:30) the car was still at the same distance.
The car was stopped.
There may have been a bad traffic accident that closed the road or the driver may have stopped for a quick cup of coffee.
1. What is the empirical formula of a compound that contains 0.783g of C, 0.196g of H and 0.521g of O?
Answer:
The empirical formula of the compound with the data in the question is C2H6O
Explanation:
What we need to do here is to divide the individual masses of the elements by their atomic masses.
The atomic mass of oxygen is 16 a.m.u
The atomic mass of hydrogen is 1 a.m.u
The atomic mass of carbon is 12 a.m.u
Thus, we proceed as follows;
C = 0.783/12 = 0.06525
O = 0.521/16 = 0.0325625
H = 0.196/1 = 0.196
What is next here is to divide each of the values we have gotten above by the smallest value we have obtained. The smallest value we have obtained is that of oxygen which is 0.0325625
Hence, we have;
C = 0.06525/0.0325625 = 2.00
O= 0.0325625/0.0325625 = 1
H = 0.196/0.0325625 = 6
Thus, the empirical formula will be C2H6O
These are the questions
Answer:
3) 1
4) 0.2
5) 2
6) 1
7) 0.2
Explanation:
3)
The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.
4)
CO2 has a molar mass of just about 44 grams, meaning that 44 grams of it would be about a mole. 5000mL of solution is 5 liters, meaning that the molarity of this solution would be 1/5=0.2.
5)
HF has a molar mass of about 20, meaning that 20 grams of it is about a mole. 1/0.5=2M.
6)
Calcium flouride has a molar mass of about 78 grams, meaning that 156 grams is about two moles. 2000mL is 2 liters, meaning that this has a molarity of 2/2=1.
7)
Glucose has a molar mass of about 180 grams, meaning that 360 grams of it would be about 2 moles. 2/10=0.2.
Hope this helps!
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88w88 *what have I caught here?
Which of the following is included in the measure of U.S. GDP?
the value of increase in business inventories.
what is the law of conversation of mass
Answer:
Law of conversation of mass
Explanation:
According to the law of conservation of mass, mass cannot be made or destroyed. The energy can only be transferred from one state of matter to another. When the mass is changed from one state of matter to another, the mass is rearranged and changed but is not destroyed. Thus it can be concluded that during a chemical reaction, the mass of the reactants and the products remain the same.
Which human job is most similar to the role of a producer?
Answer:
Teaching
Explanation:
Teaching or tutoring is a type of human job that gives strength to other individuals by impacting them with the necessary knowledge or skills they required to survive in life.
Teachers or tutors are the people that carry out this task.
It should be understood that the most important thing that people need to survive in life is information. And when they are given the information they will do exploit.
The options, which are missing from this question are:
Business entrepreneurEnergy plant workerWaste management specialistRestaurant criticThe job of an energy plant worker is similar to the role of a producer.
WHAT A PRODUCER DOES:
A producer is an organism that is capable of synthesizing its own food either by using sunlight or chemicals. Producers are the pioneer organisms of an energy flow between organisms. This is because they produce the source of energy that is transferred from one organism to the other. Likewise, an energy plant worker is an individual (human) that works in a factory where energy is produced and transferred to other forms.Therefore, the job of an energy plant worker is similar to the role of a producer.
Learn more: https://brainly.com/question/1932868?referrer=searchResults
In an experiment, dilute hydrochloric acid reacts with a white solid and bubbles of gas are produced. If this gas is bubbled through limewater, the limewater turns milky. What is the gas that is produced? Give the name, not the symbols.
Answer:
Explanation:
Carbon dioxide reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Hope this helps you
How do scientists determine the type of bonds present in a chemical compound?
Answer:
The kind of bond formed depends on the identity of the bonding atoms and the shape of the molecule formed for covalent bonds.
Explanation:
There are various kinds of chemical bonds that could be present in a compound;
I) ionic bond
ii) covalent bond
iii) metallic bond
The kind of bond present in the compound depends on the elements involved in the bond. Metals and nonmetals mostly form ionic bonds win which electrons are transferred from metal to nonmetal.
Nonmetals commonly form covalent bonds with each other by sharing electrons in single, double and triple bonds. One may decide if the bond between two elements is ionic, covalent or polar covalent by looking at the electro negativity difference between the bonding atoms as well as the observed molecular geometry.
Finally, two metals are bonded by metallic bonds. This is the kind of bonds found in metallic crystals.
Chlorine gas has a pressure of 1.05 atm at 25°C. What pressure will it exert at 75°C?
Answer:
It will exert a pressure of 1.23 atm
Explanation:
To calculate the pressure it will exert, we shall be using the Gay Lussac pressure law
Here, we know that pressure and volume are inversely proportional.
Mathematically:
P1/T1 = P2/T2
From the question, P1 = 1.05 atm
P2 = ?
T1 = 25 which when converted to Kelvin scale will be 25 + 273 = 298
T2 = 75 + 273 = 348
Plugging these values, we have;
1.05/298 = P2/348
= P2 = (348 * 1.05)/ 298 = 1.226 which is approximately 1.23 atm
A cast iron grate is used to sear "grill marks" into food. If the grate has a heat capacity of 458.5 J/K, how much heat must be added to the grate to heat it from 292.5K to 459.7K?
Answer:
2.74 Joules
Explanation:
The heat capacity of the metal is the amount of heat needed to raise the temperature of the metal by 1 k
heat capacity c of the sear grill = 458.5 J/K
initial temperature T1 = 292.5 K
final temperature T2 = 459.7 K
temperature change ΔT= 459.7 - 292.5 = 167.2 K
since the heat capacity is heat energy needed per degree rise in Kelvin, then the heat to raise the metal by this temperature change will be
heat required = c/ΔT = 458.5/167.2 = 2.74 Joules
A 300 gram sample of pure water exerts a vapor pressure of 740 millimeters of mercury on the walls of its container. If 0.4 00 moles of glucose (C6H12O6) is added to the water, what will be the vapor pressure of the resulting solution?
723 mm Hg
738 mm Hg
739 mm Hg
743 mm Hg
The equation,P(solution) = X(solvent * P(solvent), can be used to determine vapor pressure lowering. 300 grams of water is 300g x 1 mole/18.0g = 16.67 moles water. Thus, X = 16.67 moles water/17.07 moles total = 0.977 and the new pressure = 0.977 x 740 mm Hg = 723 mm Hg.
