Answer:
Concentration
Explanation:
Quizlet
The atomic number of sodium (Na) is 11. The element phosphorus (P) is the fourth element to the right of sodium in the periodic table.
The atomic number of phosphorus is ____. It has zero charge because it had ____ electrons.
Answer:
atomic number of phosphorous is 15. It has zero charges because it has equal number of protons and electrons
Explanation:
QUESTION 20
A slice of pizza contains 17 g of fat, 25 g of carbohydrate, and an unknown amount of protein. If the piece of pizza contains a total of 750 kcal,
how many grams of protein does the slice of pizza contain? (The accepted caloric values for foods are 4.0 kcal/g for carbohydrate, 9.0 kcalg
for fat, and 4.0 kcal/g for protein.) Report the answer to 2 significant figures.
429
O Can not be determined from the given information.
O 649
O 749
120 g
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MacBook Pro
Answer:
Explanation:
Let the protein contained in pizza be m gram .
calories contained by 17 g of fat = 17 x 9 kcals = 153 kcals .
calories contained by 25 g of carbohydrate = 25 x 4 kcals = 100 kcals .
calories contained by m g of protein = m x 4 kcals = 4 m kcals .
Total calories of slice of pizza = 153 + 100 + 4m kcals
= 253 + 4m kcals
Given ,
253 + 4m = 750
4m = 497
m = 124.25 g .
120 g ( rounded to two significant figures )
A photon of light has an energy of 1.83 x 10-18). What is the wavelength of this light? Does this light fall in the IR, visible, or UV region of the electromagnetic spectrum?
Answer:
1.09 × 10⁻⁷ m
UV region
Explanation:
Step 1: Given and required data
Energy of the photon of light (E): 1.83 × 10⁻¹⁸ J
Planck's constant (h): 6.63 × 10⁻³⁴ J.s
Speed of light (c): 3.00 × 10⁸ m/s
Step 2: Calculate the wavelength (λ) of this photon of light
We will use the Planck-Einstein's relation.
E = h × c/λ
λ = h × c/E
λ = 6.63 × 10⁻³⁴ J.s × (3.00 × 10⁸ m/s)/1.83 × 10⁻¹⁸ J = 1.09 × 10⁻⁷ m
This wavelenght falls in the UV region of the electromagnetic spectrum.
How much 2.0 M NH4NO3 is needed to make 0.585 L of 1.2 M NH4NO3 solution?
a
0.176 L
b
0.351 L
c
0.301 L
d
0.140 L
e
0.234 L
Answer:
b . 0.351 L.
Explanation:
Hello!
In this case, since diluted solutions are prepared by adding an extra amount of diluent to a stock-concentrated solution, we infer that the number of moles of solute remains the same, therefore we can write:
[tex]C_1V_1=C_2V_2[/tex]
Thus, solving for the volume of the stock solution, V1, we obtain:
[tex]V_1=\frac{C_2V_2}{C_1}[/tex]
Now, by plugging in the given data we obtain:
[tex]V_1=\frac{1.2M*0.585L}{2.0M}\\\\V_1=0.351L[/tex]
Therefore, the answer is b . 0.351 L.
Best regards!
A covalent bond forms when
What is the answer to this?
one if them is phosphate
What was a key discovery in the advancement me up early information transfer
Answer:
The transfer was essential to understand the mutation and the possibility of new, more resistant strains in microorganisms.
Explanation:
the transfer of microorganisms is based on the transfer of genetic data through conductive pathways that penetrate the membranes, called pili or genetic bridges.
These mutated genes with higher resistance are transmitted and resistance is generated in entire populations and even species.
can u pls help me with this question
Answer:
I think the answer is b
Explanation:
the paragraph states, that it is an experiment to see if there is any oxygen in the water
a helium balloon at 28 C has a volume of 1.8 L and a pressure of 102 kPa. what is the volume of the balloon when is rises into the atmosphere where the pressure is 85 kPa and the temperature is 4 C?
Answer:
V₂ =1.99 L
Explanation:
Given data:
Initial volume = 1.8 L
Initial temperature = 28°C (28+273.15 K= 301.15 k)
Initial pressure = 102 KPa
Final volume = ?
Final pressure = 85 KPa
Final temperature = 4°C (4+ 273.15 K = 277.15 K)
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
V₂ = 102 KPa × 1.8 L × 277.15 K / 301.15 K × 85 KPa
V₂ = 50884.74 KPa .L. K / 25597.75 K.KPa
V₂ =1.99 L
Most sulfide compounds of the transition metals are insoluble in water. Many of these metal sulfides have striking and characteristic colors by which we can identify them. Therefore, in the analysis of mixtures of metal ions, it is very common to precipitate the metal ions by using dihydrogen sulfate (commonly called hydrogen sulfide), H2S. Suppose you had a mixture of Fe2+, Cr3+, and Ni2+. Complete the net ionic equations for the precipitation of these metal ions by the use of H2S. (Type your answers using the format Fe2+ for Fe2+.)
Answer:
See explanation
Explanation:
For Fe;
Fe2+(aq) + 2H+(aq) + S2-(aq) ----> FeS(s) + H2(g)
For Ni
Ni2+(aq) + 2H+(aq) + S2-(aq) ----> NiS(s) + H2(g)
For Cr
2Cr3+(aq) + 6H+(aq) + 3S2-(aq) ----->Cr2S3(s) + 3H2(g)
We must remember that in writing these equations, the number of electrons lost or gained must be balanced. The number of electrons lost by the metal must equal the number of electrons gained by hydrogen. This rule was followed in writing all the equations above.
Explain two ways that photosynthesis helps a predator like a wolf or
tiger.
Answer: Photosynthetic organisms take light energy and use it to make their own "food". In this process they use carbon dioxide and light to make sugars and oxygen. This is great for other animals that utilize this oxygen and eat the plants for food.
HOPE THIS HELPS
Photosynthesis is the source of energy in the ecosystem. Without this energy source, there will be no food available to predators such as wolf or
tiger.
In the ecosystem, energy is transferred along the food chain. The food chain shows the feeding relationships among living organisms in the ecosystem.
The green plants are the primary producers. They are able to trap energy directly from the sun and make their own food through the process of photosynthesis.
It is this energy from the food that they make through photosynthesis that is passed along the food chain as herbivores eat green plants and are in turn eaten by the predators.
Also, green plants produce oxygen during photosynthesis which is taken in by animals such as wolf or tiger and is used in the breakdown of complex food materials.
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Suppose 2.27g of lead(II) nitrate is dissolved in 300.mL of a 52.0mM aqueous solution of ammonium sulfate. Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the lead(II) nitrate is dissolved in it.
Answer:
0.0457M is molarity of nitrate anion in the solution.
Explanation:
Molarity is defined as the ratio between moles of solute (In this case, nitrate ion) and liters of solution (The total volume of the solution is 300.0mL = 0.300L).
Thus, we need to convert mass of Lead(II) nitrate to moles using its molar mass (Molar mass Pb(NO₃)₂: 331.2 g/mol). Moles of Pb(NO₃)₂ = 1/2 Moles of NO₃⁻:
Moles Pb(NO₃)₂ and moles of NO₃⁻:
2.27g * (1mol / 331.2g) = 0.006854 moles Pb(NO₃)₂ * (2moles NO₃⁻ / 1mol Pb(NO₃)₂) = 0.0137moles NO₃⁻
Molarity is:
0.0137 moles NO₃⁻ / 0.300L =
0.0457M is molarity of nitrate anion in the solutionWhat is the percent composition of oxygen in
beryllium nitrate, Be(NO3)2?
The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.
What is percent composition ?
Percent composition is very straightforward. Percent composition indicates the percentage of each element in a compound by mass. A chemical compound is made up of two or more elements.
Percent composition is important because it allows us to calculate the percentage of each element in a compound. Here, the quantity is measured in terms of grams of the elements present.
For example, if we know the mass and chemical composition of a substance, we can find out the number of moles and calculate the number of atoms or molecules in the sample.
In Be(NO3)2 the percent composition of Beryllium (Be) is 6.775%, Nitrogenium (N) is 21.060% and Oxygenium (O) is72.166%.
Thus, The percent composition of oxygen in beryllium nitrate, Be(NO3)2 is 72.166%.
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Question 1 of 10
Where is a tomado most likely to form?
O A. Where warm, moist air masses traveling north collide with cool,
dry air masses traveling south
O B. On the northwestern side of a low-pressure system
C. Where a high-pressure system is lingering over an area
OD Over warm, tropical ocean water
SUBMIT
Answer:
A Where warm, moist air masses traveling north collide with cool,
dry air masses traveling south
A nonmetal in the third period that should have chemical properties similar to oxygen.
Answer:
Sulfur
Explanation:
A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.
This is because elements in the same group/family have similar chemical properties.
Chemical properties is predicated on the number of valence electrons within an atom. The number of valence electrons is the number of outermost shell electrons within an atom. Elements combines with one another using these valence shell electrons. Since sulfur is in the third period and the same vertical group as oxygen, they have similar chemical properties.PLZ HURRY GIVING 35 POINTS
If the average basal rate of oxygen consumption for an adult is 15 L/hour, then calculate how many hours of oxygen use will you get from the 4.7 L tank? Round your answer to 1 decimal place.
Answer:
0.3 hours of oxygen use will be obtained from the 4.7 L tank.
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
To solve a direct rule of three, where a, b and c are known data and x is the value to be calculated the following formula must be followed:
a ⇒ b
c ⇒ x
So [tex]x=\frac{c*b}{a}[/tex]
A value of 15 L/hour indicates that 15 L is consumed in 1 hour. The following rule of three can then be applied: if the average basal rate of oxygen consumption for an adult is 15 L in 1 hour, then 4.7 L in how long will it be consumed?
[tex]time=\frac{4.7 L*1 hour}{15 L}[/tex]
time= 0.3 hours
0.3 hours of oxygen use will be obtained from the 4.7 L tank.
In the Lewis symbol for a sulfur atom, there are __________ paired and __________ unpaired electrons. A) 2, 2 B) 4, 2 C) 2, 4 D) 0, 6 E) 5, 1 Answer: B
Answer:
C) 2, 4.
Explanation:
Hello!
In this case, since the sulfur atom has six electrons at its outer shell, it suggests it needs to gain two electrons in order to attain a complete octet, that is why it has 2 paired electrons.
Moreover, since two electrons are paired, then 4 electrons will remain unpaired; therefore the answer would be C) 2, 4.
Best regards!
Which of these can be found in a plant cell but not in an animal cell?
A.) chromosome
B.)nucleus
C.)chloroplast
D.)cell membrane
i would really like it if u could help me out with this. please and thank u :)
Answer:
C.)chloroplastExplanation:
The plant cell has a cell wall, chloroplasts, plastids, and a central vacuole—structures not found in animal cells. Plant cells do not have lysosomes or centrosomes.
What type of energy does the
mitochondrion provide the cell?
chemical energy (ATP)
light energy
thermal energy
sound energy
The answer is multiple choice
Answer:
Thermal
Explanation:
I think im not quite sure but since thermal is basically heat energy, I assume it would be thermal energy
what would be a logical explanation for why carbon dioxide increased over the time shown in the graph.
A. the area of land for crops incresed
b. the amount of plants eaten by animal increased
c. the amount of fossil fuels being burned increased
d. the amount of wood being burned by pepole increased
Answer:
c. the amount of fossil fuels being burned increased
Explanation:
Carbon dioxide gas concentration increased over the time due to burning of fossil fuels increased. Fossil fuels are organic compounds which releases carbondioxide gas as a result of burning of fossil fuels in the engines of vehicles and industries. With the passage of time, number of vehicles increases in the world which needs more fossil fuels and due to burning of that fossil fuels, more carbondioxide gas is released.
Is it more difficult to remove a valence electron from a Magnesium (Mg) atom or a Chlorine (Cl) atom
Answer: It is more difficult to remove a valence electron from a Chlorine (Cl) atom
Explanation:
Ionization energy is the energy required to remove the valence electron from an isolated gaseous atom.
Magnesium (Mg) is the 12th element of periodic table and has an atomic number of 12. The electronic configuration is 2, 8, 2. It can easily lose its valence 2 electrons to attain stable configuration.
Chlorine (Cl) is the 17th element of periodic table and has an atomic number of 17. The electronic configuration is 2, 8, 7. It has a tendency to gain electron to attain stable configuration. It cannot lose its valence electron easily as the valence electrons experience more nuclear charge.
Thus it is more difficult to remove a valence electron from a Chlorine (Cl) atom
Chlorine(Cl) is the more difficult to remove a valence electron from which is
because it needs one electron to achieve a stable octet configuration.
Magnesium (Mg) is an element which has an atomic number of 12. The
electronic configuration is 2, 8, 2. This means it has to lose its 2 valence
electrons needed to attain a stable octet configuration.
Chlorine (Cl) is an element which has an atomic number of 17. The electronic
configuration is 2, 8, 7. This means it has to gain one valence electrons
needed to attain a stable octet configuration.
Thus it is more difficult to remove a valence electron from a Chlorine (Cl)
atom than Magnesium atom.
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For the following reaction, 22.5 grams of iron are allowed to react with 35.0 grams of chlorine gas . iron(s) chlorine(g) iron(III) chloride(s) What is the maximum mass of iron(III) chloride that can be formed
Answer:
53.31g of FeCl3
Explanation:
The equation of the reaction is given as;
2Fe(s) + 3Cl2(g) --> 2FeCl3(s)
From the stochiometry of the reaction;
2 mol : 3 mol : 2 mol
112g : 213g : 324.4g
Converting the masses given to moles;
Number of moles of Fe = mass / molar mass = 22.5 / 56 = 0.4018
Number of moles of Cl2 = mass / molar mass = 35 / 71 = 0.4930
In this reaction, the limiting reactant is Cl2
213 g of Cl2 produces 324.4g of FeCl3,
35g of Cl2 would produce xg of FeCl3
213 = 324.4
35 = x
x = (35 * 324.4) / 213 = 53.31g
Part II: Covalent Bonding 1. Now, you will investigate diatomic molecules, those that are made up of two of the same type of atom. Select 2 fluorine atoms. a. How many valence electrons are in each fluorine atom
Answer:
Seven electrons.
Explanation:
There are seven valence electrons in each fluorine atom because it belongs to halogens. Fluorine atom requires one electron to complete its valence shell to become stable so for that it form both ionic and covalent bonds with different atoms. It makes ionic bond with alkali metals by accepting one electron to complete its valence shell and also make covalent bond by sharing of electrons.
In the following pair, determine whether the two represent resonance contributors of a single species or depict different substances. If two structures are not resonance contributors, explain why. Select the single best answer.
N-N ≡ N: and N=N=N:
Answer:
They are resonance contributors
Explanation:
Resonance structures are structures that differ only in the distribution or placement of electrons.
Considering the two structures, we can easily see that the two species have the same total number of bonds and electrons differing only in the distribution of these electrons.
Hence, they are resonance contributors.
Please help me thanks so much....I’ll mark you?!?!:)))) ( 32 points)
Answer:
I believe it's chemical
Answer:
physical
Explanation:
it's not changing form or substance
Xander is gaining weight. Which best describes what he can do to prevent obesity? exercise every day and also make healthy choices in his diet excercise once a week but make no change in his diet exercise once a week and also make healthy choices in his diet exercise every day but make no change in his diet
Answer:
exercise every day and also make healthy choices in his diet
Explanation:
This is going to prevent Xander from getting more overweight and will help him lose some pounds.
This is also something I need to do lol
<3
Answer:
A
Explanation:
Exercise every day and also make healthy choices in his diet
Analysis of a salt results in the following composition: 3.47 g of Sodium; 2.12 g of Nitrogen; and 7.27 g of Oxygen. What is the simplest formula for this salt
Answer:
NaNO₃
Explanation:
Data obtained from the question include:
Mass of sodium (Na) = 3.47 g
Mass of nitrogen (N) = 2.12 g
Mass of oxygen (O) = 7.27 g
Simplest (empirical) formula =?
The simplest formula for the salt can be obtained as follow:
Na = 3.47 g
N = 2.12 g
O = 7.27 g
Divide by their molar mass
Na = 3.47 / 23 = 0.151
N = 2.12 / 14 = 0.151
O = 7.27 / 16 = 0.454
Divide by the smallest
Na = 0.151 / 0.151 = 1
N = 0.151 / 0.151 = 1
O = 0.454 / 0.151 = 3
Simplest formula = NaNO₃
Thus, the simplest formula for the salt is NaNO₃
3) An object accelerates 7.2 m/s2 when a
force of 4.0 Newtons is applied to it.
What is the mass of the object?
Answer:
0.56 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{4}{7.2} \\ = 0.5555555...[/tex]
We have the final answer as
0.56 kgHope this helps you
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 3.00 molesmoles of aluminum sulfate, Al2(SO4)3Al2(SO4)3. Express the number of moles of AlAl, SS, and OO atoms numerically, separated by commas.
Answer:
[tex]n_{Al}=6.00molAl\\\\n_{S}=9.00molS\\\\n_{O}=36.0molO[/tex]
Explanation:
Hello!
In this case, when analyzing the moles of an element inside a compound, we need to keep in mind that a mole ratio should be set up; thus, for aluminum sulfate, we have the following ones:
[tex]\frac{2molAl}{1molAl_2(SO_4)_3} \\\\\frac{3molS}{1molAl_2(SO_4)_3} \\\\\frac{12molO}{1mol1molAl_2(SO_4)_3}[/tex]
Thus, starting by 3.00 moles of aluminum sulfate, the moles of each element turn out:
[tex]n_{Al}=3.00molAl_2(SO_4)_3*\frac{2molAl}{1molAl_2(SO_4)_3} =6.00molAl\\\\n_{S}=3.00molAl_2(SO_4)_3*\frac{3molS}{1molAl_2(SO_4)_3} =9.00molS\\\\n_{O}=3.00molAl_2(SO_4)_3*\frac{12molO}{1molAl_2(SO_4)_3}=36.0molO[/tex]
Best regards!