Answer:
Bueno al principio pero empeorando con el paso del tiempo.
Explicación:
La calidad del aire es buena al inicio de la pandemia y hay menos infección en el aire pero con el paso del tiempo la infección se propaga a un ritmo más rápido y la calidad del aire se contamina con la infección que infecta a más personas. La pandemia reduce su intensidad cuando la gente sigue las reglas saludables que previenen la propagación de la pandemia en esa localidad por lo que podemos decir que la última semana de pandemia tiene menor número de pacientes.
A curium-245 nucleus is hit with a neutron and changes as shown by the equation. Complete the equation by filling in the missing parts. 52 54 138 140 142 Xe Te Ce
The question is incomplete, the complete question is:
A curium-245 nucleus is hit with a neutron and changes as shown by the equation. Complete the equation by filling in the missing parts.
[tex]_{96}^{245}\textrm{Cm}+_0^1\textrm{n}\rightarrow _{42}^{103}\textrm{Mo}+_{r}^{q}\textrm{p}+3_0^1\textrm{n}[/tex]
Answer: The complete equation formed is [tex]_{96}^{245}\textrm{Cm}+_0^1\textrm{n}\rightarrow _{42}^{103}\textrm{Mo}+_{54}^{140}\textrm{Xe}+3_0^1\textrm{n}[/tex]
Explanation:
The general representation of an isotope is given as:
[rex]_Z^A\textrm{X}[/tex]
where,
A is the mass number, Z is the atomic number and X is the symbol of the element
In a nuclear reaction, total atomic number and total mass number on either side of the reaction remains the same
For the given chemical reaction:
[tex]_{96}^{245}\textrm{Cm}+_0^1\textrm{n}\rightarrow _{42}^{103}\textrm{Mo}+_{r}^{q}\textrm{p}+3_0^1\textrm{n}[/tex]
On the reactant side:
Total atomic number = [96 + 0] = 96
Total mass number = [245 + 1] = 246
On the product side:
Total atomic number = [42 + r + 0] = 42 + r
Total mass number = [103 + q + 3] = 106 + q
Calculating for 'r' and 'q', we get:
[tex]96= 42 + r\\\\r=96-42=54[/tex]
[tex]246 = 106+q\\\\q=246-106=140[/tex]
Thus, the missing isotope is [tex]_{54}^{140}\textrm{Xe}[/tex]
Hence, the complete equation formed is [tex]_{96}^{245}\textrm{Cm}+_0^1\textrm{n}\rightarrow _{42}^{103}\textrm{Mo}+_{54}^{140}\textrm{Xe}+3_0^1\textrm{n}[/tex]
Answer: try 140 52 xe
Explanation:
5. The bond in a molecule of Cl2 could be described as
A. covalent
O B. ionic
C. both A and B
O D. neither A nor B
the bond in a molecule of Cl2 is a covalent bond
Need the answer ASAP!!!
Select the correct answer.
A student puts a glass of water in the freezer. Later, he notices ice forming on the surface of the water. Which property of water best explains
why ice forms on its surface?
OA
Ice has more surface tension than liquid water,
OB.
Ice is less dense than liquid water.
OC.
Ice has a lower freezing point than liquid water.
OD
Ice is more cohesive than liquid water.
O E.
Ice can dissolve more oxygen than liquid water.
Answer:
The Ice is Less Dense than the Water
Explanation:
I just answered this one myself, and the explanation is also just that Ice isn't dense enough to sink.
3 upper M n upper O subscript 2 (s) plus 4 upper A l (s) right arrow 2 upper A l subscript 2 upper O subscript 3 (g) plus 3 upper M n (s). What is the enthalpy of the reaction?
Answer: The enthalpy of the reaction is -1791.31 kJ.
Explanation:
Enthalpy change is the difference between the enthalpies of products and the enthalpies of reactants each multiplied by its stoichiometric coefficients. It is represented by the symbol [tex]Delta H^o_{rxn}[/tex]
[tex]\Delta H^o_{rxn}=\sum (n \times \Delta H^o_{products})-\sum (n \times \Delta H^o_{reactants})[/tex] .....(1)
For the given chemical reaction:
[tex]3MnO_2(s)+4Al(s)\rightarrow 2Al_2O_3(s)+3Mn(s)[/tex]
The expression for the enthalpy change of the reaction will be:
[tex]\Delta H^o_{rxn}=[(2 \times \Delta H^o_f_{(Al_2O_3(s))}) + (3 \times \Delta H^o_f_{(Mn(s))})] - [(3 \times \Delta H^o_f_{(MnO_2(s))}) + (4 \times \Delta H^o_f_{(Al(s))})][/tex]
Taking the standard heat of formation values:
[tex]\Delta H^o_f_{(Al_2O_3(s))}=-1675.7kJ/mol\\\Delta H^o_f_{(Al(s))}=0kJ/mol\\\Delta H^o_f_{(MnO_2(s))}=-520.03kJ/mol\\\Delta H^o_f_{(Mn(s))}=0kJ/mol[/tex]
Plugging values in the above expression:
[tex]\Delta H^o_{rxn}=[(2 \times (-1675.7))+(3 \times 0)] - [(3 \times (-520.03))+(4 \times 0)]\\\\\Delta H^o_{rxn}=-1791.31 kJ[/tex]
Hence, the enthalpy of the reaction is -1791.31 kJ.
In the reaction shown below, ____________ acts as a base because ___________. HCO3- + H2O à H3O+ + CO32-
Answer: In the reaction [tex]HCO^{-}_{3} + H_{2}O \rightarrow H_{3}O^{+} + CO^{2-}_{3}[/tex], [tex]H_{2}O[/tex] acts as a base because it has accepted a hydrogen ion or proton.
Explanation:
According to Arrhenius, species which dissociate to give hydrogen ions when dissolved in a solvent like water are called acid.
A species which readily accepts a hydrogen ion or proton is called a base.
For example, [tex]HCO^{-}_{3} + H_{2}O \rightarrow H_{3}O^{+} + CO^{2-}_{3}[/tex]
Here, [tex]HCO^{-}_{3}[/tex] is donating hydrogen ion. So, it is an acid whereas [tex]H_{2}O[/tex] is accepting the hydrogen ion. Hence, [tex]H_{2}O[/tex] is a base.
Thus, we can conclude that in the reaction [tex]HCO^{-}_{3} + H_{2}O \rightarrow H_{3}O^{+} + CO^{2-}_{3}[/tex], [tex]H_{2}O[/tex] acts as a base because it has accepted a hydrogen ion or proton.
What species is reduced in the reaction below?
Zn° + 2 Ag+ → Zn2+ + 2 Agº?
A) Znº
B) Agº
C) Zn2+
D) Ag+
Answer: The correct option is D) [tex]Ag^+[/tex]
Explanation:
The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction. It occurs when oxidation number of a species increases.
A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction. It occurs when oxidation number of a species decreases.
For the given chemical reaction:
[tex]Zn^0+2Ag^+\rightarrow Zn^{2+}+2Ag^0[/tex]
On the reactant side:
Oxidation number of Zn = 0
Oxidation number of Ag = +1
On the product side:
Oxidation number of Zn = +2
Oxidation number of Ag = 0
As the oxidation number of Ag is decreasing from +1 to 0. Thus, [tex]Ag^+[/tex] is getting reduced.
Hence, the correct option is D) [tex]Ag^+[/tex]
What is the general form of a synthesis reaction?
O A. AB + CD → AC + BD
B. A + B → AB
O C. AB + C → AC + B
D. AB → A+B
Be
The answer is B
Answer:
B. A+ B → AB
Explanation:
general form of a synthesis reaction
I need some help
3KOH + FeCl3 → Fe(OH)3 + 3KCl
How many moles of FeCl3 are needed to completely react with 3.0 g of KOH?
Answer:
0.0178
Explanation:
because you can work out the amount of moles in KOH using moles = mass/mr.
The mr of the KOH is 39.1+16+1=56.1 so you do
[tex] \frac{3}{56.1} [/tex]
which equals to 0.053475 so u 3SF which is 0.0535moles
than u uses the molar ratio which is 3 to 1
so 0.0535÷3=0.0178 which is the moles of FeCl3.
hope this make sense:)
write an equation for the reaction in which hydrochloric acid neutralises sodium hydroxide
Answer:
ok
Explanation:
A salt is a neutral ionic compound. Let's see how a neutralization reaction produces both water and a salt, using as an example the reaction between solutions of hydrochloric acid and sodium hydroxide. The overall equation for this reaction is: NaOH + HCl -> H2O and NaCl.
A gas fills up a container that has 2.5L has a pressure of 3.5 atm. If the gas gets transferred to a container that holds 4L, what would the new pressure be?
What is the mass of 10.5 moles of H20?
Answer:
180g
Explanation:
So, 10 mole of water will weigh (18x10) = 180g.
A light wave traveling through glass strikes the boundary with a second medium at a 45° angle and then refracts away from the boundary. What could the second medium be?
A.
Water
B.
Air
C.
Diamond
D.
Glass
Diamond has the highest refractive index, causing the light wave to refract away from the boundary.
Option (C) is correct.
The key observation is that the light wave refracts away from the boundary. This suggests that the second medium has a higher index of refraction than glass. Among the given options, diamond has the highest refractive index, making it the most likely choice.
Diamond has a refractive index of approximately 2.42, which is significantly higher than that of water, air, and glass. When light travels from a medium with a lower refractive index (such as glass) to a medium with a higher refractive index (such as diamond), it bends towards the normal line. This causes the light wave to refract away from the boundary, as described in the scenario.
Therefore, the most plausible answer is that the second medium is diamond.
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balance the equations
H2+o2-H2o
C+H2-Ch4
CaCo3+HCL-CaCl2+Co2+H2o
Answer:
Explanation:
Hope this helps u!!
plzzz answer fastttttttt
I will give brainliest
Answer:
starch or carbs - amylase
fat - lipase
protien - pepsim
Which of the following pairs of elements is most likely to form an ionic compound?
• magnesium and sodium
• nitrogen and sulfur
• oxygen and chlorine
• magnesium and chlorine
• carbon and fluorine
Explanation:
magnesium and sodium because they are minerals and part of iron
1. Which type of telescope is most useful for detecting a star that emits very long
electromagnetic waves?
Is baking soda pure or impure
Answer:
Is baking soda pure or impure
answer: pure
A person throws a 0.44-kg ball straight up into the air. It reaches a height of 9
m. What is the force on the ball as it begins to fall? (The acceleration due to
gravity is 9.81 m/s2)
A. 2.06 N
B. 2.48 N
C. 4.32 N
0 D. 1.18N
C - 4.32
Explanation:
.44 x 9.81
HELP ;-;
Vanillin, C8H8O3, the principal component of vanilla beans, is very similar to glucose, C6H12O6 a type of sugar. Brittany Spears has a life threatening allergy to vanillin. After one of her concerts she was found dead in her dressing room. A glass lined with a white powder was found smashed on the floor next to her. Police think the glass was lined with vanillin suggesting she was murdered. A 2.54 g sample of this powder underwent carbon-hydrogen analysis. It’s combustion was found to produce 5.875 g of CO2 (g) and 2.41 g of H2O(g) . Find the empirical formula of this compound and determine if Brittany may have been poisoned?
b) Is this evidence enough to conclude for certain that the identity of the powder on the glass is indeed vanillin? Why or why not?
Answer:
The empirical formula is: CH2
Th powder is not vainillin
Explanation:
We can find empirical formula of a compound CₐHₓOₙ knowing that moles CO2 = Moles C, 2 Moles H2O = Moles H and that we can find the mass of oxygen by the difference of masses of the atoms:
Moles C = Moles CO2 -Molar mass: 44.01g/mol-
5.875g * (1mol/44.01g) = 0.1335 moles C * (12.01g/mol) = 1.60gC
Moles H2O and moles H -Molar mass: 18.01g/mol-
2.41g H2O * (1mol / 18.01g) = 0.1339 moles H2O * (2mol H / 1mol H2O) =
0.2676 moles H * (1g/mol) = 0.27g H
The empirical formula of this compound is the ratio of C:H:
0.2676 moles H / 0.1335 moles C = 2
The empirical formula is:
CH2
In vainillin, the moles of Carbon = Moles of Hydrogen. the experiment shows the moles of hydrogen are twice the moles of carbon. Thus, the powder is not vainillin
What is a surface that reflects a color of 500 nanometer wavelength?
Answer:
something cyan colored?
what happened to the ionization energy of hydrogen"H" when its electron affinity
define the chemical reaction?
Answer:
HOPE IT HELPED U ....
Explanation:
Chemical reaction is a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
Answer:
a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
Explanation:
hope this help friend
Take two samples, one is oil and other is water. Mix the two. You observe that?
Answer:
Explanation:mckxmmxkmsskkskskskxisisisisisisisks
You are a NASCAR pit crew member. Your employer is leading the race with 20 laps to go. He just finished a pit stop and has 5.0 gallons of fuel in the tank. On the way out of the pits, he asks, "Am I going to have enough fuel to finish the race or am I going to have to make another pit stop?" You whip out your calculator and begin your calculations based on your knowledge of stoichiometry. Other information you know is: The car uses an average of 300.0 grams of O2 for each lap. The formula for fuel is C5H12. The fuel has a density of 700 g/gal. What do you tell the driver? (The density can be used as a conversion factor between grams and gallons)
Answer:
Since there are 3500 g of fuel left in the tank, and he needs only 1687.5 g to complete 20 laps, he has enough fuel to complete the race. I will tell the driver that he does not need to make another pit stop as he has enough fuel to complete the race.
Explanation:
Density = mass / volume
Density of fuel = 700 g/ 1 gal
Therefore, the mass of fuel in 1 gallon = 700 g
The driver has 5.0 gallons of fuel in the tank.
The mass of 5.0 gallons of fuel = 5 × 700 = 3500 g of fuel
Equation of the combustion of fuel, C₅H₁₂ is given below:
C₅H₁₂ + 8 O₂ ---> 6 H₂O + 5 CO₂
1 mole C₅H₁₂ requires 8 moles of O₂
1 mole of C₅H₁₂ has a mass = 72 g
8 moles of O₂ has a mass = 256 g
Therefore, 300 g of O₂ will require 300 × (72/256) g of C₅H₁₂ = 84.375 g of C₅H₁₂
84.375 g of fuel is used by the car per lap;
20 laps will require 20 × 84.375 g of fuel = 1687.5 g of fuel.
Since there are 3500 g of fuel left in the tank, and he needs only 1687.5 g to complete 20 laps, he has enough fuel to complete the race. I will tell the driver that he does not need to make another pit stop as he has enough fuel to complete the race.
How long is radioactive waste from nuclear plants radioactive?
1.) 100,000 years
2.) 10,000 years
3.) 100 years
4.) 1,000 years
the total energy gain of the ice cube and the resulting liquid water is blank joules
Answer:
bro
Explanation:
bro
Answer: yes
Explanation:
Because of the mass
Give the systematic name for PbO2
The systematic name for PbO₂ is lead dioxide.Therefore, the correct option is A.
What are systematic names?Systematic names are a type of chemical nomenclature that follow a systematic set of rules to name chemical compounds. Lead dioxide (PbO₂) is a chemical compound composed of lead and oxygen. It is an oxide of lead and can also be called lead(IV) oxide.
The systematic name of the compound is derived by using the root word of the metal, “lead,” and adding the suffix “-dioxide” to indicate the two oxygen atoms. Thus, the systematic name for PbO₂ is lead-dioxide.Therefore, the correct option is A.
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The question is incomplete, but most probably the complete question is,
Give the systematic name for PbO₂?
A. Lead dioxide
B. Lead trioxide
C. Lead oxide
D. Lead azide
Write the electron configuration for Gold (Au). You may choose to write it in the long form or in the noble gas configuration form (shortcut).
Answer:
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s¹4f¹⁴5d¹⁰
Explanation:
If I threw a block of sodium into a lake, and the H2 created took up 34 L of space at STP (standard temperature and pressure: 1 atm and 0C), how many grams of Na did I begin with?
Answer:
70g Na
Explanation:
The sodium reacts with water as follows:
2Na + 2H2O → 2NaOH + H2
Where 2 moles of Na produce 1 mole of H2.
To solve this question we must find the moles of H2. With the balanced equation we can find the moles of Na and its mass as follows:
Moles H2:
PV = nRT; n = PV/RT
Where P is pressure = 1atm,
V is volume = 34L,
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273.15K = 0°C
Replacing:
n = 1atm*34L/0.082atmL/molK*273.15K
n = 1.52 moles H2
Moles Na:
1.52 moles H2 * (2mol Na / 1mol H2) = 3.04 moles Na
Mass Na-Molar mass: 22.99g/mol-
3.04 moles Na * (22.99g / mol) =
70g Naexpand write down the binomial expansion of (1+2x)^7in ascending power of x ,simplifying all the coefficient. use the expansion theory to calculate the value of (0.98)^7 correct to four decimal places.
Answer:
0.86812566700000000000000
The binomial expansion of (1+2x)^7in ascending power of x is 0.868125.
What are binomial expansions?The algebraic expression (x + y)n can be expanded according to the binomial theorem, which represents it as a sum of terms using separate exponents of the variables x and y.
Each word in a binomial expansion has a coefficient, which is a numerical value. A binomial is a two-term algebraic expression. Examples of binomials include a + b, x - y, and more.
When a binomial is raised to exponents 2 and 3, we can use a set of algebraic identities to determine the expansion. As an illustration, (a + b)2 = a2 + 2ab + b2.
By regrouping and combining like phrases, we can arrange our final response in ascending powers of x by placing the lowest power of x first and the highest power of x last.
Therefore, the binomial expansion of (1+2x)^7in ascending power of x is 0.868125.
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