. In which reaction is nitric acid acting as an oxidising agent? A. CuO + 2HNO3 → Cu(NO3)2 + H2O B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 C. Na2CO3 + 2HNO3 → 2NaNO3 + H2O + CO2 D. NaOH + HNO3 → NaNO3 + H2O

Answer:

Urea contains more nitrogen

Explanation:

1 mole of Urea contains 2 moles of Nitrogen and 1 mole of ammonium sulfate contains, also, 2 moles of nitrogen.

60g of urea (Molar mass: 60g/mol) contains:

60g × (1mol / 60g) = 1 mole. As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 2.

100g of ammonium sulfate (Molar mass: 132g/mol) contains:

100g × (1mol / 132g) = 0.758 moles.

As 1 mole of urea contains 2 moles of nitrogen, moles of nitrogen are 0.758×2 = 1.516 moles.

That means, urea contains more nitrogen.

Answer:

Electrical Energy

Explanation:

There are a variety of chemical and mechanical devices that are called batteries, although they operate on different physical principles. A battery for the purposes of this explanation will be a device that can store energy in a chemical form and convert that stored chemical energy into electrical energy when needed.

Answer:

Explanation:

Describe means you should recall facts, events or processes accurately. You might need to give an account of what something looked like, or what happened.

Explain means you need to make something clear, or state the reasons for something happening.  

Compare means you need to describe similarities and differences between things. If you are asked to compare X and Y, write down something about X and something about Y, and give a comparison. Do not just write about X only or Y only.

Evaluate means you must use information supplied, or your own knowledge, to consider the evidence for and against or to identify strengths and weaknesses. You must then complete your answer with a conclusion, stating which is better and why, for example.

Answer:

Double replacement reaction

Explanation:

This is what is known as a double replacement reaction. The two parts of each molecule separate and recombine to form two new compounds. For instance, [tex]Al_2(SiO_3)_3[/tex] separates into [tex]Al_2[/tex] and [tex](SiO_3)_3[/tex], while [tex]NaOH[/tex] separates into [tex]Na[/tex] and [tex]OH[/tex], and then they recombine with the other compound.

Hope this helps!

Answer:

double replacment reaction

Explanation:

srry if it is wrong

Answer:

2.78

Explanation:

When multiplying, your answer will have the same amount of sig figs as the multicand or multiplier that has the lower number of sig figs. In this case, 4.03 is the one with the lowest number of sigs figs, which is 3 sig figs, so the answer should have 3 sig figs, so the answer is 2.78.

Answer:

80 MOLES OF WATER ARE PRODUCED WHEN 20 MOLES OF PROPANE ARE BURNED IN EXCESS OXYGEN ON A GAS GRILL.

Explanation:

Equation for the reaction:

C3H8 + 5 O2 --------->  4 H2O + 3 CO2 + Heat

The above equation is in the presence of excess oxygen.

In this reaction,

1 mole of propane forms 4 moles of H2O

If 20 moles of propane were to be used, how many moles of water will be produced?

1 mole of propane = 4 moles of water

20 moles of propane = ( 4 * 20 ) moles of water

= 80 moles of water.

So, if 20 moles of propane were burned in excess oxygen, 80 moles of water will be formed. Propane is heavier than air and when properly combusted produces a large amount of heat. It is also non toxic.

80 MOLES OF WATER are produced when 20.0 moles of propane are burned in excess oxygen on a gas grill.

C₃H₈ + 5 O₂ --------->  4 H₂O + 3 CO₂ + Heat

The above equation is in the presence of excess oxygen.

In this reaction, 1 mole of propane forms 4 moles of H₂O

1 mole of propane = 4 moles of water

20 moles of propane = ( 4 * 20 ) moles of water

20 moles of propane= 80 moles of water.

Thus, if 20 moles of propane were burned in excess oxygen, 80 moles of water will be formed.

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Answer:

[tex]1.2*10^{-2} g[/tex]

Explanation:

[tex]1 mol - 6*10^{23} particles[/tex]

[tex]1.6*10^{20}* \frac{1 mol}{6.02*10^{23}} = 0.00026578 mol\\\\M(CO2) = 12 + 2*32=44 \frac{g}{mol}\\[/tex]

[tex]44\frac{g}{mol} *0.00026578 mol =0.012 = 1.2*10^{-2} g[/tex]

The mass of 1.6x[tex]10^{20}[/tex] molecules of carbon dioxide will be 1.2 × [tex]10^{-2}[/tex] g.

A physical body's mass would be its total amount of matter. Inertia, or even the body's resistance to acceleration whenever a net force will be applied, is also measured by this term.

Calculation of mass :

Given data:

Number of molecule of carbon -dioxide = 1.6x[tex]10^{20}[/tex].

It is known that , 1 mol = 6 × [tex]10^{23}[/tex] particle.

Since,  1.2 × [tex]10^{-2}[/tex] g × 1 mol /  6 × [tex]10^{23}[/tex] = 0.00026578 mol.

M([tex]CO_{2}[/tex]) = 12 +2 × 32 = 44 g/mol

Now, convert g/mol into gram.

44 g/mol × 0.000265 mol.= 0.012 = 1.2 × [tex]10^{-2}[/tex] g.

Therefore, the mass of carbon dioxide will be 1.2 × [tex]10^{-2}[/tex] g.

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Answer:

Experimentation is the best way to obtain knowledge.

Explanation:

This is a statement and it is scientific

Answer:

e

Explanation:

Answer:

Human activities contribute to climate change by causing changes in Earth's atmosphere in the amounts of greenhouse gases, aerosols (small particles), and cloudiness. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere.

Explanation:

Answer:use of aerosoles

Burning of fossil fuels

Cutting down trees(this is because CO2 is used in photosynthesis)

Hope this helps

Explanation:

Answer:

4. Copper(II) carbonate

5. Magnesium carbonate

Explanation:

Only Potassium carbonate, Sodium carbonate and Ammonium carbonate are soluble.

The rest of the carbonates are insoluble.

Answer:

It is a metaphorical line that divides the earth from north to south

Explanation:

Answer:

98 g

Explanation:

Start with the balanced equation. Then, make a little chart under the equation showing the information you have and need.

        3O₂(g) + 4Al(s)  →  2Al₂O₃(s)

m        ?           110 g

M      ___       ____

n       ___ <=  ____

"m" is for mass. "M" is for molar mass (some teachers use "MM"). "n" is for the number of moles.

To find the mass of oxygen:

To find molar mass, use the atomic mass on your periodic table. For each atom of an element, add on its atomic mass.

Molar mass of aluminum (one Al atom):

[tex]M_{Al} = 26.982 g/mol[/tex]

Molar mass of oxygen (two O atoms):

[tex]M_{O_{2}} = 16.000g/mol+16.000g/mol[/tex]

[tex]= 32.000g/mol[/tex]

Update the chart:

               3O₂(g)       +          4Al(s)          →     2Al₂O₃(s)

m                ?                        110 g

M      32.000 g/mol       26.982 g/mol

n                ___         <=      ____

Find the moles of aluminum

[tex]n_{Al} = \frac{110g}{1} *\frac{1mol}{26.982g}[/tex]    Multiply mass by molar mass to find moles.

[tex]n_{Al} = \frac{110}{1} *\frac{1mol}{26.982}[/tex]       The units "g" cancel out.

[tex]n_{Al} = 4.0(7)mol[/tex]        Keep one extra significant figure. (110 has 2 sig. figs.)

               3O₂(g)       +          4Al(s)          →     2Al₂O₃(s)

m                ?                        110 g

M      32.000 g/mol       26.982 g/mol

n                ___         <=   4.0(7) mol

Find the moles of oxygen using the mole ratio, which comes from the coefficients in the balanced equation.

The mole ratio of oxygen to aluminum is 3 to 4.

[tex]n_{O_{2}} = \frac{4.0(7)mol_{Al}}{1}*\frac{3mol_{O2}}{4mol_{Al}}[/tex]     Multiply moles of aluminum by the mole ratio.

[tex]n_{O_{2}} = \frac{4.0(7)}{1}*\frac{3mol_{O2}}{4}[/tex]             "molAl" units cancel out.

[tex]n_{O_{2}} = 3.0(52)mol_{O2}[/tex]              Keep two sig. figs. when the first is a "5"

               3O₂(g)       +          4Al(s)          →     2Al₂O₃(s)

m                ?                        110 g

M      32.000 g/mol       26.982 g/mol

n          3.0(52) mol   <=    4.0(7) mol

Find the mass of oxygen

[tex]m_{O_{2}} = \frac{3.0(52)mol}{1}*\frac{32.000g}{1mol}[/tex]        Multiply moles by molar mass.

[tex]m_{O_{2}} = \frac{3.0(52)}{1}*\frac{32.000g}{1}[/tex]             The "mol" unit cancels out.

[tex]m_{O_{2}} = 97.(6)g[/tex]                         Keep one sig. fig. to round. "6" rounds up.

[tex]m_{O_{2}} = 98g[/tex]                               <= Final answer

∴ 98 grams of oxygen are required to completely react with 110 grams of aluminum.

Answer:

HCO₂H

Explanation:

A buffer is defined as the mixture between a weak acid and its conjugate base, or vice versa, in an aqueous solution.

The HCO₂Na (Sodium formate), is the conjugate base of formic acid, HCO₂H, a weak acid of pKa = 3.75.

Thus, to make a buffer using HCO₂Na, the other substance the buffer should contain is HCO₂H

Answer:

HCO₂H

Explanation:

Answer:

B

Explanation:

Oxidation

Zn---> Zn2+ 2e

Reduction

Cu2+ + 2e ---->Cu

Answer:

9.53g

Explanation:

Given the following :

Density = 1.065g/mL

Volume of solution = 25.0mL

% of acetic acid =58%

Molar mass of CH3COOH = 60.05g/mol

Molar mass of Ca(OH)2 = 74.093g/mol

Reaction:

2CH3COOH + Ca(OH)2 ----> Ca(CH3Co2)2 +2H2O

Volume of solution × density × % of CH3COOH × (mole per molar mass CH3COOH) × (mole of Ca(OH)2 per mole of CH3COOH) × (molar mass of Ca(OH)2 per mole of Ca(OH)2)

25mL × (1.065/1) × (58/100) × (1 / 60.05) × (1 / 2) × (74.093 / 1)

25 × 1.065 × 0.58 × 0.0166527 × 0.5 × 74.093

= 9.526g

Answer:

10

Explanation:

Answer: 10 neutrons

This isotope of fluorine has 9 protons, 9 electrons and 10 neutrons.

Explanation:

Answer:

Neutron

Explanation:

Answer:

About 164 grams

Explanation:

The molecular formula of calcium nitrate is [tex]Ca(NO_3)_2[/tex]. The molar mass of calcium is about 40, while the molar mass of nitrogen is about 14 and oxygen is about 16. Therefore, the molar mass of it is:

[tex]40+2(14+3(16))=40+2(14+48)=40+124=164[/tex]

Hope this helps!

Answer:

Option B. Keq = [CO2] [CaO]/ [CaCO3]

Explanation:

The balanced equation for the reaction is given below:

CaCO3(s) —> CaO(s) + CO2(g)

The expression for the equilibrium constant, Keq is simply the ratio of the concentration of the products to that of the reactants.

The expression for the equilibrium constant, Keq is given below:

Keq = [CO2] [CaO] / [CaCO3]

Answer: c) Keq= [co2]

Explanation:

edge 2023

bromine is used to distinguish between saturated and unsaturated compounds. when bromine water is added to the unsaturated compound, bromine that added to the unsaturated compound and the red brown colour of bromine water is discharged.

Answer:

La cantidad de yodo en la muestra es 0.217 g

Explanation:

Los parámetros dados son;

Normalidad de la solución de Na₂S₂O₃ = 0.1 N

Volumen de la solución de Na₂S₂O₃ = 17.1 mL

Masa de muestra = 0.376 g

La ecuación de reacción química se da de la siguiente manera;

I₂ + 2Na₂S₂O₃ → 2 · NaI + Na₂S₄O₆

Por lo tanto, el número de moles de sodio por 1 mol de Na₂S₂O₃ en la reacción = 1 mol

Por lo tanto, la normalidad por mol = 1 M × 1 átomo de Na = 1 N

Por lo tanto, 0.1 N = 0.1 M

El número de moles de Na₂S₂O₃ en 17,1 ml de solución 0,1 M de Na₂S₂O₃ se da de la siguiente manera;

Número de moles de Na₂S₂O₃ = 17.1 / 1000 × 0.1 = 0.00171 moles

Lo que da;

Un mol de yodo, I₂, reacciona con dos moles de Na₂S₂O₃

Por lo tanto;

0,000855 moles de yodo, I₂, reaccionan con 0,00171 moles de Na₂S₂O₃

La masa molar de yodo = 253.8089 g / mol

La masa de yodo en la muestra = 253.8089 × 0.000855 = 0.217 g.

Answer:

b

Explanation:

edge 2021

According to the concept of conduction,heat  flows from faster molecules to slower molecules when they collide.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules .

There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

Heat is transferred from faster to slower molecules when they collide , thus the correct option is that heat flows from faster molecules to slower molecules when they collide.

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Answer:

Pentane

Explanation:

Dependent variables receive this name because, in an experiment, their values are studied under the supposition. The dependent variable is the cleanliness of the clothes.

It is something on which other elements depend. A test score, for instance, may be a dependent variable because it could vary based on a number of variables, including how much you studied, how much sleep you got the night before the test, and even how hungry you were.

A dependent variable is one that is altered as a result of the modification of an independent variable. Your independent variable "depends" on the outcome you're interested in measuring. Dependent variables are also referred to as: response elements (they respond to a change in another variable)

There are often two different sorts of variables in analytical health research. We anticipate that independent variables will have an impact on dependent variables.

Thus,The dependent variable is the cleanliness of the clothes.

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Answer: (1) Hydroxide ion

Explanation: Because LiOH is a base hydroxide ion is OH-

The answer is hydroxide ion.

Using this equation, we find the pH of pure water to be 7. This is considered to be neutral on the pH scale. The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic.

When an excess base is dissolved in a solution of sodium hydroxide. Sodium hydroxide dissociates into OH- ions and when the number of OH- increases then concentration also increases because concentration is the number of OH- ions present per unit volume.

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Answer:

a colloid (heterogeneous mixture) that dispearses the particles intermediate in size.

Explanation:

Answer:

e

Explanation:

Answer:

A      20

B      40

C      Ca

D      10

E       9

F      F

Explanation: