Answers
Explanation:
the answer is circle 3 hope it helps
Related Questions
Buffer sol that contain 1 mol NH4Cl and 1mol NH4OH per liter find PH
Answers
Answer: what
Explanation:
Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow. Pb ( N O ₃ ) ₂ (aq) + K I (aq) → ☐⁴⁻ ☐³⁻ ☐²⁻ ☐⁻ ☐⁺ ☐²⁺ ☐³⁺ ☐⁴⁺ 1 2 3 4 5 6 7 8 9 0 ☐₁ ☐₂ ☐₃ ☐₄ ☐₅ ☐₆ ☐₇ ☐₈ ☐₉ ☐₀ + ( ) → ⇌ (s) (l) (g) (aq) NR Pb I N O K Reset
Answers
Answer: [tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced molecular equation is:
[tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)[/tex]
Please help me I’m not sure with that
Answers
Answer:
i cant see the picture sorry
Explanation:
Which of the following statements about balanced chemical equations is correct?
A.
The products must contain the same numbers and types of atoms as the reactants.
B.
The products must contain the same arrangement of atoms as found in the reactants.
C.
The products must contain the same numbers but not the same types of atoms as the reactants.
D.
The products must contain the same types but not the same numbers of atoms as the reactants.
Answers
Answer:A.
The products must contain the same numbers and types of atoms as the reactants.
Explanation: I think this
Answer:a
Explanation:
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose C6H12O6 and oxygen O2 gas. Calculate the moles of water needed to produce 0.075mol of glucose. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits
Answers
Answer: 0.45 moles of water are needed to produce 0.075mol of glucose.
Explanation:
The balanced chemical reaction is:
[tex]6CO_2(g)+6H_2O(l)\rightarrow C_6H_{12}O_6(aq)+6O_2(g)[/tex]
According to stoichiometry :
1 mole of glucose require = 6 moles of [tex]H_2O[/tex]
Thus 0.075 moles of glucose require = [tex]\frac{6}{1}\times 0.075=0.45[/tex] moles of [tex]H_2O[/tex]
0.45 moles of water are needed to produce 0.075mol of glucose.
Which of the following is a potential exception to cell theory? Choose 1 answer: Fungal spore Asexual reproduction Mitochondria Amoebas
Answers
Answer:
Asexual reproduction
Explanation:
Cells are able to re produce themselves without other cells needed. If cells need others to make more then how would that work and plus we wouldn't have the theory of cells existing.
Pre-Lab Assignment
1.
Describe the following trends in properties of oxides across Period 3.
(a)
(b)
Their appearance.
Their volatility
Their structure.
Their acid-base character
Their conductivity
(d)
Answers
Answer:
See explanation
Explanation:
From left to right, the oxides across period 3;
i) Period 3 oxides all appear white in colour. They are all crystalline solids and their melting points decrease from left to right.
ii) The volatility of period 3 oxides increases from left to right across the periodic table
iii) The metallic oxides on the right hand side adopt giant ionic structures. Silicon oxide which is in the middle of the period forms a giant covalent structure. Oxides of other elements towards the right hand side form molecular oxide structures.
iv) The acidity of oxides of period 3 increases from left to right. Metals on the left hand side form basic oxides while non-metals on the right hand side form acidic oxides. The oxide of aluminium in the middle is amphoteric.
v) The oxides of period 3 elements do not conduct electricity. However, the metallic oxides on the lefthand side conduct electricity in molten state. The non-metallic oxides on the right hand side are molecular hence they do not conduct electricity under any circumstance.
How many Joules of heat are released from a 400g piece of glass that has been cooled
from 28°C to 6°C? The specific heat for this particular type of glass is 0.664 J/g°C.
please show work.
Answers
Answer:
400 × 22 × 0.664 = 5843.2 J
Calculate the root - mean - square speeds of helium atoms and nitrogen molecules in m/s at 25° C
Answers
Answer: a) root - mean - square speeds of helium atom is 43.1 m/s
b) root - mean - square speeds of nitrogen molecule is 16.29m/s
Explanation:
The formula used for root mean square speed is:
[tex]\nu_{rms}=\sqrt{\frac{3RT}{M}}[/tex]
where,
[tex]\nu_{rms}[/tex] = root mean square speed
R = gas constant = [tex]8.314J/Kmol[/tex]
T = temperature = [tex]25^0C=(25+273)K=298K[/tex]
M = atomic mass
a) root - mean - square speeds of helium atom [tex](He)[/tex]
[tex]\nu_{rms}=\sqrt{\frac{3\times 8.314J/Kmol\times 298K}{4g/mol}}=43.1m/s[/tex]
b) root - mean - square speeds of nitrogen molecule [tex](N_2)[/tex]
[tex]\nu_{rms}=\sqrt{\frac{3\times 8.314J/Kmol\times 298K}{28.02g/mol}}=16.29m/s[/tex]
How many equivalents are in a solution that contains 0.25 moles Mg2+ and 0.50 moles Cl–?
Answers
Answer:
Explanation:
Mg²⁺ is divalent , hence
Molecular weight / 2 = equivalent weight .
.25 moles = 2 x .25 equivalents = .5 equivalents .
Cl⁻ is monovalent so
molecular weight = equivalent weight
.50 mole = .50 equivalent
Total equivalent = .50 of Mg²⁺ + .50 of Cl⁻
= 1 equivalent .
Which feature of a balanced chemical equation demonstrates the law of
conservation of mass?
A. It has the same types of atoms on both sides of the reaction
arrow.
B. It shows the reactants of a chemical reaction to the left of the
reaction arrow.
C. It shows the products of a chemical reaction to the right of the
reaction arrow
D. It has coefficients to show how much of each substance a
chemical reaction uses.
SUBMIT
Answers
Answer:
Another answer is : It has equal numbers of each type of atom in its reactants and products.
Explanation:
I just got it right on A.pex
Given the data from the question, the correct statement is:
It has the same types of atoms on both sides of the reaction arrow (Option A) What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
From the law of conservation of matter, it is evident that the same atoms of the element in the reactants are present in the products.
Thus, we can conclude that the correct answer to the question is: It has the same types of atoms on both sides of the reaction arrow (Option A)
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Answer fast please?????????????
Answers
Answer:
option a. iron,copper, aluminium.
Which molecule or ion below would be expected to have a trigonal planar electron domain geometry?
a. nitrate ion, NO3 1-
b. at least two of these
c. carbon tetrachloride
d. water
e. sulfur dioxide
Answers
Answer:
a. nitrate ion
e. sulfur dioxide
Explanation:
Trigonal planar geometry, is possible, where the combination of atoms or lone pain form a triangle which is is same plane.
Hence, from the given options,
Nitrate ion has a trigonal planar geometry.Carbon tetrachloride has a teterahedral geometrywater has a bent angular geometry.sulfur dioxide has a trigonal planar geometry.Therefore,
From the given options, the correct answer is -
a. nitrate ion
e. sulfur dioxide
You find a 1979 copper penny (pre-1982 pennies are pure copper) in the snow and pick it up. How much heat does the penny absorb as it warms from the temperature of the snow, -5.0∘C to the temperature of your body, 37∘C. Assume the penny is pure copper and has a mass of 3.10 g. (The specific heat capacity of copper is 0.385 J/g∘C.)
Answers
Answer:
50.127 J
Explanation:
The following data were obtained from the question:
Initial temperature (T₁) = –5 °C
Final temperature (T₂) = 37 °C
Mass (M) = 3.10 g
Specific heat capacity (C) = 0.385 J/gºC
Heat (Q) absorbed =?
Next, we shall determine the change in temperature. This can be obtained as follow:
Initial temperature (T₁) = –5 °C
Final temperature (T₂) = 37 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 37 – (–5)
ΔT = 37 + 5
ΔT = 42 °C
Finally, we shall determine the heat absorbed. This can be obtained as follow:
Mass (M) = 3.10 g
Specific heat capacity (C) = 0.385 J/gºC
Change in temperature (ΔT) = 42 °C
Heat (Q) absorbed =?
Q = MCΔT
Q = 3.10 × 0.385 × 42
Q = 50.127 J
Thus, the heat absorbed is 50.127 J.
which statements describe the relationship between the area and the bioversity
Answers
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What is climate? What are three things that cause the earths climate?
Answers
Answer:
The climate has been caused by many natural factors including changes in the sun emissions from volcanoes variations in Earth's orbit and levels of carbon dioxide. Global climate change has typically occured very slowly over thousands or millions of years .The three causes of the Earth's climate are
Industrial activitiesAgricultural activitiesDeforestationthese are the causes of the Earth's climate.
Climate is a average weather in a given area for a long period of time is called a climate
maybe this might help ur question
What is the PH for a solution that has an H+ ion concentration of 1.0x10^-6 M
Answers
Answer: POH=8
Explanation:PH = -log( H+concentration)
PH = 6
POH = 14 - PH = 8
What is the estimated life expectancy of tin reserves?
Answers
Answer:
chemical reaction hope this helps ;)
Explanation:
Use your balanced reaction to make a "for every" statement for magnesium and hydrochloric acid in this reaction
A: For every 1 mol of magnesium, the reaction makes 1 moles of hydrochloric acid.
B: For every 24.305 mol of magnesium, the reaction uses up 34.46 mol of hydrochloric acid,
C: For every 1 mole of magnesium, the reaction uses 2 moles of hydrochloric acid.
D: For every 1 mol of magnesium, the reaction uses 1 mol of hydrochloric acid.
Answers
Answer:
Right answer is C.
Explanation:
Based on the reaction with magensium, Mg, and hydrochloric acid, HCl:
Mg + 2HCl → MgCl₂ + H₂
The reaction is balanced in moles therms
We can see that 1 mole of Magnesium is reacting with 2 moles of HCl to produce 1 mole of MgCl₂ and 1 mole of H₂. In another words:
For every 1 mole of magnesium, the reaction uses 2 moles of hydrochloric acid.
Right answer is C.The balanced reaction will be C. For every 1 mole of magnesium, the reaction uses 2 moles of hydrochloric acid.
From the information given, based on the reaction with magnesium and hydrochloric acid, the balanced reaction will be:
Mg + 2HCl → MgCl₂ + H₂
It can be deduced that the reaction is balanced. It can be seen that 1 mole of magnesium is reacting with 2 moles of hydrochloric acid to produce 1 mole of MgCl₂ and 1 mole of H₂.
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If a 130-kg car is traveling at a velocity of 23 m/s, what is the kinetic energy of the car?
Answers
KE = 1/2 * 130 * 23^2
KE = 34385J
Kinetic energy is the amount of energy present in the object due to motion. It is required by the body for action and motion. The kinetic energy of the car is 34385J.
What is kinetic energy?Kinetic energy is a type of energy that is directly proportional to the mass of the object and the square of the velocity. The formula for the kinetic energy can be given as,
[tex]\rm KE = \dfrac{1}{2}mv^{2}[/tex]
Here,
Mass of the car (m) = 130 kg
Velocity of the car (v) = 23 m/s
Substituting values in the equation:
[tex]\begin{aligned}\rm KE &= \dfrac{1}{2}\rm mv^{2}\\\\&= \dfrac{1}{2}\times 130\times (23)^{2}\\\\&= 34385\;\rm J\end{aligned}[/tex]
Therefore, 34385J is the kinetic energy of the car.
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who know the song genius?
Answers
Answer:
Me
Explanation:
The one with sia??
How many moles of PCl5 can be produced from 54.0 g of Cl2 (and excess P4)?
Answers
Answer:
0.304 mole of PCl₅.
Explanation:
We'll begin by calculating the number of mole in 54 g of Cl₂. This can be obtained as follow:
Mass of Cl₂ = 54 g
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mole of Cl₂ =?
Mole = mass /molar mass
Mole of Cl₂ = 54 / 71
Mole of Cl₂ = 0.76 mole
Finally, we shall determine the number of mole of PCl₅ produced by the reaction of 54 g (i.e 0.76 mole) of Cl₂.
The equation for the reaction is given below:
10Cl₂ + P₄ —> 4PCl₅
From the balanced equation above,
10 moles of Cl₂ reacted to produce 4 moles of PCl₅.
Therefore, 0.76 mole of Cl₂ of will react to produce = (0.76 × 4)/10 = 0.304 mole of PCl₅.
Thus, 0.304 mole of PCl₅ were obtained from the reaction.
How much heat is required to change 100.0g of ice at 0C into water at 0C?
Answers
Answer:
5 degrees required for ice
please help will give brainiest
Answers
Answer:
reaction, reversed, The Law Of Conservation of Mass, mass, rusts, oxygen
Explanation:
HOPE THIS HELPS!
8. Which of the following is TRUE about limiting and excess reactants?
A. The excess reactant will be completely consumed after the reaction is complete
B. The limiting reactant determines the maximum amount of product that can be formed
C. Some of the limiting reactant is left over after the reaction is complete.
D. The reactant that has the largest given mass will be the excess reactant.
Answers
The statement which is TRUE about limiting and excess reactants is (B) The limiting reactant determines the maximum amount of product that can be formed.hence the correct option is (B)
What is Limiting reagent ?A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent.
Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.
The reactant that is totally consumed during a reaction, or the limiting reagent, decides when the process comes to an end.
The precise quantity of reactant required to react with another element can be estimated from the reaction stoichiometry.
Therefore, The statement which is TRUE about limiting and excess reactants is (B) The limiting reactant determines the maximum amount of product that can be formed.hence the correct option is (B)
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what observation helps a poison ivy plant survive in its environment
Answers
Give two reasons why people should use petrochemicals wisely.
Answers
2 Because they're a cause of carbon pollution.
As petrochemicals are originate from petroleum products, it is non-renewable and also can result in pollution so they are used wisely.
What are petrochemicals?Petrochemicals are the chemical byproducts of petroleum refining. Some petroleum-derived chemical compounds are also derived from other fossil fuels, such as coal or natural gas, or renewable sources, such as maize, palm fruit, or sugar cane.
All of this begins with six fundamental petrochemicals: ethylene, propylene, butylenes, benzene, toluene, and xylenes, which are combined with other chemicals and transformed into other materials that improve products.
Concerns are raised not only about the negative environmental impact, but also about the impact on human health.
Many petrochemicals are among the most toxic substances known to man, but they are found in almost everything, from plastics to synthetic fragrances and dyes to fertilizer.
Thus, these are used wisely.
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NASA pointed the Hubble Space Telescope at a very dark section of sky to see what might be found. The telescope revealed
about 10,000 distant and never-before-seen galaxies. NASA would have to make observations of more than 10,000,000
other sections to study the rest of the sky. If every section of sky also looked out on 10,000 galaxies, about how many
galaxies would exist in the known universe?
100,000,000
1,000,000,000
10,000,000,000
100,000,000,000
Hel
Answers
Answer:
100,000,000,000
Explanation:
Given that :
1 hubble space telescope pointed at 1 section of the sky reveals 10,000 distinct galaxies ;
Number of sections from which observation is to be made = 10,000,000
Number of distinct galaxy per section = 10,000
Number of galaxies that would exist in the known universe :
Total number of galaxies in the known universe :
Number of galaxies per section * number of sections
10,000 * 10,000,000
= 100,000,000,000s
What are a few ways your body maintains homeostasis?(6th grade and its science)
Answers
Answer: Internal Temperatures. Similarly, the cardiovascular, integumentary (skin and associated structures), respiratory, and muscular systems work together to help the body maintain a stable internal temperature. If body temperature rises, blood vessels in the skin dilate, allowing more blood to flow near the skin's surface.
Explanation:
Someone pls help me!!
Answers
Answer:
0.0821 L•atm/mol•K
Explanation:
The value of the ideal gas can be obtained as follow:
NOTE: We shall use the standard value for each variable. Based on the options given above, we shall use the equivalent units as well.
Pressure (P) = 1 atm
Volume (V) = 22.4 L
Number of mole = 1 mole
Temperature (T) = 273 K
Gas constant (R) =?
PV = nRT
Divide both side by nT
R = PV / nT
R = (1 × 22.4) / (1 × 273)
R = 22.4 / 273
R = 0.0821 L•atm/mol•K
Thus, the ideal gas constant is 0.0821 L•atm/mol•K