Answer:
what do you need to know to decide whether this statement is correct?
Which of the following substances dissolves most readily in water?
a. CH
c. NH3
b. BaSO4
d. CaCO3
Describe why predator and prey organisms tend to evolve together.
Answer:
Explanation
Explanation:
Let's say that in an environment, the trees are turning yellow (this is obviously made up) and there are green butteflies and red birds that hunt the butterflies. Both will need to evolve, or else they will both be spotted by predators, like snakes can eat the birds, and those birds eat the butterflies.
If you mix food dye with water, is that a physical change or chemical? (Cause my teacher said chemical)
Explanation:
well, I dunno if I'm correct but I think it's a physical change cause no new substance is formed
what do i do can u help:)
Answer:
The locations of the volcanoes tend to be close/on the earthquake lines/zones and this is because earthquake activity forms mountains/volcanoes and also causes those volcanoes to erupt. The reason the earthquake zones are long lines is because earthquakes usually happen on fault lines, or where two tectonic plates are next to each other. These plates are like a jigsaw puzzle, as in, they are everywhere making up the pieces of the surface of the globe. So that's why they are long lines.
The chemical equation below shows the photosynthesis reaction. 6CO2 6H2O Right arrow. C6H12O6 6O2 The molar mass of carbon dioxide (CO2) is 44. 01 g/mol. The molar mass of water (H2O) is 18. 02 g/mol. A reaction uses 528 g of CO2. How many moles of water are used in this reaction? 12. 0 moles 72. 0 moles 216 moles 528 moles.
A photosynthetic reaction is the formation of the glucose and oxygen molecule by water and carbon dioxide. 12 moles of water will be used in the reaction.
What are moles?Moles are the ratio of the mass of the substance to the molar mass of the substance.
In the photosynthetic reaction, 6 moles of carbon dioxide and 6 moles of water are utilized to produce 1 mole of a glucose molecule and 6 moles of oxygen.
From this, it can be said that the number of moles consumed of carbon dioxide and water will be equal and in the ratio of 1:1.
The number of moles of carbon dioxide will be equal to that of the water molecule and will also be equal to the ratio of the mass of carbon dioxide to the molar mass of carbon dioxide.
The moles of water will be calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{\text{mass of CO}_{2}}{\text{molar mass of CO}_{2}}\\\\&= \dfrac{528}{44.01}\\\\&= 12\;\rm moles\end{aligned}[/tex]
Therefore, option A. 12 moles of water will be used.
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A gas in a 3.5-L container has a pressure of 285 mm Hg. When the gas is transferred completely to a 750 mL container at the same emperalure, the pressure will be
Answer:
285
Explanation:
If there are 12 moles of NH4Cl produced, how many grams of FeCl3 did you start with?
If there are 12 moles of NH4Cl produced, how many grams of FeCl3 did you start with?
Given:-12 moles of NH4Cl producedTo Find:- Number of moles of FeCl3 initiallyAnswer:- 4 moles of FeCl3Explanation:- Law used :- law of conservation of mass in an isolated system.law of constant number of moles in an isolated system.According to the question:- From one mole of FeCl3 we will get 3 moles of the Cl atom Only one mole of Cl is required to form one mole of the NH4Cl compoundGiven 12 moles of NH4Cl is produced in the end which means 12 moles of Cl2 is used .
So ,
1 mole of FeCl3 gives -> 3 moles of Chlorine.
⅓ moles of FeCl3 gives -> 1 mole of Chlorine.
12× ⅓ moles of FeCl3 gives -> 12 moles of Chlorine.
4 moles of FeCl3 gives -> 12 moles of Chlorine.
The reaction below proceeds spontaneously at 298 K. NH3(g) Cl2(g)Right arrow. NH4Cl(s) What is the sign of the entropy change, Delta. S? Delta. S is negative because the product is less random than the reactants. Delta. S is negative because the reactants are less random than the product. Delta. S is positive because the product is less random than the reactants. Delta. S is positive because the reactants are less random than the product.
A spontaneous reaction favours the product formation and increases the entropy of the isolated system. The sign of the entropy change will be negative as the product formation is less random.
What is entropy?Entropy is the degree of the disorder or randomness that occurs in the system that lacks available energy and cannot convert the mechanical energy or work.
The entropy of the reaction will be negative as the reactants are present in the gaseous state and the product formed is solid. The product formation was spontaneous and less random.
Therefore, option a. entropy will be negative as product formation is less random.
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Please help me
A sample of a liquid with mass of 8.657g was decomposed into its elements and gave 5.217 g of carbon ,0.9620 g of hydrogen, and 2.478g of oxygen. What is the percentage composition of this compound
Answer:
The percent composition of a compound is the calculated measure of each ... A sample of a liquid with a mass of 8.657 grams was discovered into its elements ad gave 5.217 grams of carbon, 0.9620 grams of hydrogen, and 2.478 grams of oxygen. ... mass of oxygen = 2.478 grams ... 14.01 g/mol x100 = 3.03 g/mol x 100.
Hope this helps, please let me know If I'm wrong.
can someone help me? i dont think i did this right..
Explanation:
wat exactly do u need to do here?
Hola Brainlians! I need your help in chemistry today
Question:-
Names and chemical formulas of all compounds formed by first 30 elements.
Note:-
In between these 30 elements ,there is carbon and hydrogen present who has infinite no of organic compounds .So just mentioning the common compounds
Here we go
Sodium chloride (NaCl)Lithium hydride(LiH)Methane(CH_4)Zinc sulphate (ZnSO_4)Ferus Ferric oxide(Fe_3O_4)Water(H_2O)Hydrochloric acid(H_2SO_4)Molybdenom oxide(Mo_2O_3)Cuprous oxide(Cu_2O)Potassium permanganate (KMnO_4)Potassium chloride (KCl)Magnesium oxide (MgO)Calcium hydroxide (Ca(OH)_2)Calcium oxide(CaO)Phosphorus pentachloride (PCl_5)Nitrous oxide (N_2O)Carbon dioxide (CO_2)Carbon monoxide (CO)Glucose(C_6H_12O_6)Baking soda(NaHCO_3)Consider the following reaction: NO2(g)→NO(g)+12O2(g) The following data were collected for the concentration of NO2 as a function of time:
Time (s) [NO2] (M) 0 1.000 10 0.951 20 0.904 30 0.860 40 0.818 50 0.778 60 0.740 70 0.704 80 0.670 90 0.637 100 0.606
A. What is the average rate of the reaction between 10 and 20 s?
B. What is the average rate of the reaction between 50 and 60 s?
C. What is the rate of formation of O2 between 50 and 60 s?
The term rate of reaction, RR, refers to the speed at which the reactants of a chemical reaction are turned into products. A) RR = 0.0047 M/s; B) RR = 0.0038 M/s; C) 0.0019 M/s.
What is the rate of reaction?When talking about the rate of reaction we refer to the speed at which a chemical reaction occurs, turning reactants into products.
It can be measured as
the concentration of reactant consumed in a certain timethe concentration of product formed during the same time.The formula to calculate the rate of reaction is the following,
RR = Δ concentration / Δ Time
Where,
RR is the rate of reactionΔ concentration is the change of concentration, C2 - C1 or C1 - C2Δ Time is the change in time, T2 - T1In the exposed example, the chemical reaction is
NO₂(g) → NO(g) + 12 O₂(g)
So the rate of reaction can be measured according to
how fast NO₂ is consumed, or how fast NO and O₂ are produced.Since the collected data was the concentration of NO₂ as a function of time, then the rate of reaction was measured as the speed at which NO₂ was consumed.
A. What is the average rate of the reaction between 10 and 20 s?
Available data
C1 = 0.951 MC2 = 0.904 MT1 = 10 sT2 = 20 sRR = Δ concentration / Δ Time
RR = (0.951 - 0.904) / 20 - 10
RR = 0.074 / 10
RR = 0.0047 M/s
B. What is the average rate of the reaction between 50 and 60 s?
Available data
C1 = 0.778 MC2 = 0.740 MT1 = 50 sT2 = 60 sRR = Δ concentration / Δ Time
RR = (0.778 - 0.740) / 60 - 50
RR = 0.038 / 10
RR = 0.0038 M/s
C. What is the rate of formation of O₂ between 50 and 60 s?
Now, since NO₂ turns into NO and O₂, then
RR = Rate of NO₂ consumed = 2x rate of O₂ produced
If RR between 50 and 60 s is 0.0038 M/s, then the rate of formation of O₂ is,
Rate of NO₂ consumed / 2 = rate of O₂ produced
0.0038 M/s / 2 = rate of O₂ produced
0.0019 M/s = rate of O₂ produced
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Which object is necessary to make an image appear larger? A. a concave lens a B. a convex lens C. a plane mirror D. a triangular prism
The largest source of background ionizing radiation in the United States is _____, which is formed in the decay series of uranium.
The correct statement will be"The largest source of background ionizing radiation in the United States is Radon (Rn)which is formed in the decay series of uranium."
What is the largest source of background ionizing radiation in the United States?Generally, Ionizing radiation is simply defined as a state of energy that works by releasing electrons from their parent atoms or the molecules of materials.
In conclusion, Radon (Rn) a chemical element of Group 18 in the periodic table is the largest source of background ionizing radiation in the United States.
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What is the molarity of 25.00 grams of powdered (solid) AgNO3 added to 500.00mL of pure water. The molar mass of AgNO3 is 169.874g/mole or also written as 1mole/169.874g
1 Calculate the moles of AgNO3 added.
2 Divide by total volume. M= n/v
3 Ensure your units are correct (that means use your dimensional analysis)
Here are your hints.
The moles of AgNO3 is between 0.100 and 0.500
The numerical value of your concentration should be between 0.100 and 0.500
The molarity of 25.00 grams of powdered AgNO3 added to 500.00mL of pure water is 0.29 mol/L
StoichiometryFrom the question, we are to determine the molarity of the solution prepared.
First, we will determine the number of moles of AgNO₃ present.
Using the formula,
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
From the given information,
Mass = 25.00 g
Molar mass = 169.874 g/mole
Number of moles = [tex]\frac{25.00}{169.874}[/tex]
Number of moles of AgNO₃ present = 0.147168 mole
Now, for the molarity of the solution
[tex]Molarity = \frac{Number\ of\ moles}{Volume}[/tex]
From the given information,
Volume = 500.00 mL = 0.5 L
Molarity = [tex]\frac{0.147168}{0.5}[/tex]
Molarity = 0.294336
Molarity ≅ 0.29 mol/L
Hence, the molarity of 25.00 grams of powdered AgNO3 added to 500.00mL of pure water is 0.29 mol/L
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What is anaerobic respiration in your own words
Answer:
Anaerobic respiration is the type of respiration through which cells can break down sugars to generate energy when oxygen isnt there
Explanation:
hope this helps!
Anaerobic respiration occurs without oxygen and releases less energy but more quickly than aerobic respiration.
[tex]#Keeplearning [/tex]
Which of the following is a measure of the randomness of a system?
O A. Heat
O B. Energy
O C. Efficiency
O D. Entropy
Which of the following are signs of a
chemical change?
A. changes in state of matter, volume, and mass
B. changes in odor, color, and temperature
C. changes in shape, position, and size
D. changes in size, temperature, and state of matter
Answer:
A
Explanation:
Answer:
B. Changes in odor, color, and temp
Explanation:
The others are physical changes
How many liters of solvent would be needed to create a 5.5 M solution from 22 moles of sodium chloride?
According to molar concentration, four liters of solvent would be needed to create a 5.5 M solution from 22 moles of sodium chloride.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters. Substitution of values in formula gives, volume= 22/5.5=4 liters.
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WILL GIVE BRAINLIEST
Which if the following help a tropical storm become a hurricane?
making landfall
a cold wind
an earthquake
warm water
Answer:
an earthquake
Explanation:
Burning hydrogen is an example of a chemical reaction. The reaction is
shown in the diagram. Which of the following sthtements about energy in
this reaction is the most accurate?
Answer:
Energy is absorbed
Explanation:
since 1932 i learn this
juhygg ggvjjh ghhhhhdhdhdhhdhdh dhhdhfhfjfjfdjjdjdusjsjsjw
Answer:
I dont quit understand this question.
Explanation:
Try typing it again
Why is this element considered
unreactive or inert?
P: 10
N: 10
Answer:
It is a noble gas.
Explanation:
The element in question is helium, a noble gas. It has a full shell of eight valence electrons like all the other noble gases, which means that it does not have to react with other elements in order to obtain a full octet of valence electrons. This means that it does not react with other elements.
Why is calcium in group 2A if the modern periodic table
Rebecca placed an uncharged object next to an electrically charged object, and they were attracted to each other. She moved the charged object and placed it next to another uncharged object, and they were attracted to each other. What is the best explanation as to why this happened? The charged object kept its charge.
The charged object lost its charge.
The second object had a stronger charge.
The second object had a weaker charge.(PLEASE HELP)
Answer:
the second object had a weaker charge
Explanation:
the charged object had a stronger charge and opposite to that of the uncharged hence causing attraction
Answer:
d
Explanation:
The second object had a weaker charge.
Select the correct answer. A chemist is working on a reaction represented by this chemical equation: FeCl2 2KOH → Fe(OH)2 2KCl. If the chemist uses 4. 15 moles of iron(II) chloride and 3. 62 moles of potassium hydroxide, how many moles of iron(II) hydroxide will the reaction produce? A. 1. 81 mol B. 3. 62 mol C. 4. 15 mol D. 7. 24 mol.
Moles are the proportion of the mass of the substance and that of the molar mass of the substance. The number of moles of iron (II) hydroxide will be 1.81 mol.
What is a mole?A mole is the measuring unit of the chemistry that measures even the small number of atoms, molecules and ions of the given compound. It can be given as the division of the mass from the molar mass.
The balanced chemical reaction can be shown as:
[tex]\rm FeCl_{2} + 2KOH \rightarrow Fe(OH)_{2} + 2KCl[/tex]
In the question, the number of the moles of iron (II) chloride is 4.15 mol and of potassium hydroxide is 3.62 mol.
From the reaction, it can be said that the ratio of the moles of potassium hydroxide and iron (II) hydroxide is 2:1.
The number of moles of iron (II) hydroxide is calculated as:
[tex]\begin{aligned}\rm n(Fe(OH)_{2}) &=\rm \dfrac{n(KOH)}{ 2}\\\\&= \dfrac{3.62}{2}\\\\&= 1.81 \;\rm mol\end{aligned}[/tex]
Therefore, option A. 1.81 mol is the moles of iron (II) hydroxide that will be produced.
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please help me 50 points!
Answer:
135 g
Explanation:
Molar mass of 3O₂ = 3 × 16 × 2 = 96
Molar mass of 2SO₃ = 2 ( 32 + 16 × 3 )= 160
moles of 3O₂ = 96.0 g / 96 g/mol = 1
moles of 2SO₃ = x g / 160 g/mol
1 = x/160
x = 160 g
160 × 84.5% = 135.2
lab report solubility edge
Answer:
i'm attaching the report i made
Explanation:
(It does include the chart information)
hope this helps! have a wonderful day :)
The solubility of a solid solute increases with temperature.
What is the effect of temperature on the solubility of a solute?The solubility of a solute is the amount of solute that dissolves in a given volume of solvent at a particular temperature.
The solubility of a solute increases with increase in temperature.
Based on the lab results, it was seen that with increase in temperature, the mass of sugar that dissolves in water increases.
50 mL of water at 2 °C dissolved only 80 g of sugar whereas at 102 °C, 250 g of sugar dissolved.
Therefore, it can be concluded that solubility of a solute increases with temperature.
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the outer planets have a very _______ atmosphere
~Shoto Todoroki here~
Except for Pluto, the outer planets are alike in a lot of ways. They are much bigger than the inner planets. They are made mostly of hydrogen and helium. The hydrogen and helium are in the form of gas in the planets' atmospheres.
hope this helps :D
Answer:
The atmospheres of outer planets are made of hydrogen and helium, so that should help.
General characteristics of S block elements
Answer:
soft metalslow melting and boiling points low ionization enthalpies (energies) and are highly electro positive.Explanation:
Hope it helps!!!!