Answer:
The energy released from food was once energy from the sun that was captured by plants in the chemical process that forms plant matter (from air and water). Food provides animals with the materials they need for body repair and growth and the energy they need to maintain body warmth and for motion.
Answer:
Explanation: That energy inanimals food, used for body repair,growth, motion .It maintain body warmth, once energy from the sun.
What would happen to an objects potential energy as it begins moving? A) Potential energy would remain the same B) Potential energy would increase C) Potential energy would decrease D) Potential energy would disappear
What is the best Dog Training Organization for German Shepherds
Answer:
see it at Google search it
Answer:
The Police Station
Explanation:
They discipline the dogs to be trained
Molar mass if calcium nitrate
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!
One disadvantage of burning propane (C3H8) is that carbon dioxide is one of the products. The released CO2 increases the growing concentration of CO2 in the atmosphere. How many moles of water are produced when 20.0 moles of propane are burned in excess oxygen on a gas grill?
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.
Chemical reaction representing the burning of propane: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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Which is one type of evidence that geologists usually study? location of Earth in outer space waves that move through Earth interactions between living things on Earth diversity of life found on Earth
Answer:
The correct option is;
Waves that move through the Earth
Explanation:
In attempting to unravel the nature and arrangements of the rocks beneath the Earths surface, Geologist apply numerous methodologies including seismological field survey and analysis whereby the time of travel of natural (due to events such as earthquakes) or man made (during geological exploration) seismic wave are analysed to image the nature, composition and dynamism of the Earth's interior to find out the presence of geological faults or liquid layers as well as to predict the possible occurrence of future events within the Earth's crust in detail.
A type of evidence that geologists usually study is: B. waves that move through Earth.
Geology can be defined as the scientific study of the substances (both solid and liquid) and physical structure of planet Earth, including the processes through which they change over time.
A geologist refers to an expert or professional that studies geology. Some of the various type of evidence that geologists usually study are:
The different rock samples that are existing on the surface of planet Earth.
The mineral composition of the different layers of planet Earth.
The waves that move through planet Earth such as electromagnetic waves.
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Question 4 (higher question)
Electrolysis of acidified water can produce hydrogen and oxygen.
The apparatus for the electrolysis is:
. water containing some dilute sulfuric acid
• two graphite rods
• a suitable container for the electrolysis reaction
. a suitable source of electricity
• test tubes
Describe how to use the apparatus to electrolyse acidified water, and how to test the gases to
show that they are hydrogen and oxygen. Include a diagram in your answer. [6 marks]
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.
What mass of Ca(OH)2 is required to react with the acetic acid (CH3CO2H) in 25.0 mL of a solution having a density of 1.065 g/mL and containing 58.0% acetic acid by mass?
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
What is the dependent variable for "how does changing your laundry detergent affect how clean your clothes are?"
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.
What is the dependent variable ?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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A solution of sodium hydroxide was titrated against a solution of sulfuric acid. How many moles of sodium hydroxide would react with 1 mole of sulfuric acid?
Answer:
2 mole of Sodium hydroxide reacts with 1 mole of Sulfuric acid
Explanation:
Write down the equation in the beginning with reactants and products:
NaOH + H₂SO₄ → Na₂SO₄ + H₂0
Now try to balance it. Try with Na first:
2NaOH + H₂SO₄ → Na₂SO₄ + H₂0
Na atoms are balanced. There are 6 Oxygen atoms on the right and 5 on the left. Balance by increasing the H₂O moles:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂0
Check if H atoms are also balanced. They are. That means our final reaction is:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂0
2 Moles of NaOH reacts with 1 mole of H₂SO₄
The moles of sodium hydroxide required to neutralize 1 mole of sulfuric acid have been 2 mol.
The balanced chemical equation for the titration of sodium hydroxide against sulfuric acid has been:
[tex]\rm 2\;NaOH\;+\;H_2SO_4\;\rightarrow\;Na_2SO_4\;+\;2\;H_2O[/tex]
From the balanced chemical equation, for the titration of 1 mole of sulfuric acid, 2 moles of sodium hydroxide has been required.
The moles of sodium hydroxide required for the titration of sulfuric acid has been:
[tex]\rm 1\;mol\;H_2SO_4=2\;mol\;NaOH[/tex]
Thus, the neutralization of 1 mole of sulfuric acid has been required 2 mol of sodium hydroxide.
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give chemical tests to distinguish between saturated and unsaturated compound
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.
Is coal limited or unlimited give reasons
Answer:
Limited
Explanation:
Once it is used once, it is not reusable. Also, there's a possibility to use ALL the coal there is. That's why it's an unrenewable source, unlike the sun, wind, or water that never ends. Those are renewable
Answer:
Limited.
Explanation:
Coal comes from plants the died 100-400 million years ago and takes million years to form. Therefore, Coal is limited.
Consider the equation below. CaCO3(S) CaO(S) + CO2(g) What is the equilibrium constant expression for the given reaction?
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
Name all possible isomers of C4H9Br
Answer:
2-Bromo-2-methylpropane
Explanation:
Given the reaction: 2na + 2h2o → 2na+ + 2oh− + h2
which substance is oxidized?
1.

h2
2.

h+
3.

na
4.

na+
Answer:
[tex]\large \boxed{\text{3. Na}}[/tex]
Explanation:
We can use oxidation numbers to decide which substance is reduced.
[tex]\rm 2\stackrel{\hbox{0}}{\hbox{Na}} + 2\stackrel{\hbox{+1}}{\hbox{ H}_{2}}\stackrel{\hbox{-2}}{\hbox{O}}\longrightarrow \rm 2\stackrel{\hbox{+1}}{\hbox{Na}^{+}} + 2\stackrel{\hbox{-2}}{\hbox{O}}\stackrel{\hbox{+1}}{\hbox{H}^{-}} + \stackrel{\hbox{0}}{\hbox{H}_{2}}[/tex]
The oxidation number of Na changes from 0 in Na to +1 in Na⁺.
The oxidation number of H changes from +1 in H₂O to 0 in H₂.
[tex]\text{An increase in oxidation number is oxidation, so $\large \boxed{\textbf{Na}}$ is the substance oxidized.}[/tex]
1 and 4 are wrong because H₂ and Na⁺ are products.
2. is wrong because there is no H⁺ to be oxidized or reduced.
Unit Test
Active
TIME REMAINING
1
2
01:55:24
Which statement best describes the direction of heat flow by conduction between two samples of the same material?
Heat flows from faster molecules to slower molecules when they are near.
Heat flows from faster molecules to slower molecules when they collide.
Heat flows from slower molecules to faster molecules when they are near.
Heat flows from slower molecules to faster molecules when they collide.
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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Consider the reaction below.
Zn(s) + Cu2+ (aq)--->Zn2+ (aq) + Cu(s)
Which half reaction correctly describes the oxidation that is taking place?
A)Zn(s)--->Zn2+ (aq) +e
B)Zn(s)--->Zn2+ (aq) + 2e-
C)Cu2+ (aq) + 2e--->Cu(s)
D)Cu2+ (aq)e Cuis)
Answer:
B
Explanation:
Oxidation
Zn---> Zn2+ 2e
Reduction
Cu2+ + 2e ---->Cu
Which sentence is a scientific statement? A. There is a substance around us that cannot be detected. B. Kids should go to school for 12 years. C. Experimentation is the best way to obtain knowledge. D. Unicorns once existed on Earth. E. There are no living things on the Moon
Answer:
Experimentation is the best way to obtain knowledge.
Explanation:
This is a statement and it is scientific
Answer:
e
Explanation:
How many neutrons are in one atom of the elemen, F-19?
Answer:
10
Explanation:
Answer: 10 neutrons
This isotope of fluorine has 9 protons, 9 electrons and 10 neutrons.
Explanation:
PLEASE HURRRYYYY
A buffer is made using HCO2Na. Which other substance should the buffer contain?
HCO2Li
HCO2H
NaNO3
HCl
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:
Using the periodic table, complete the table to describe each atom. Type in your answers. A B C D E F
Answer:
e
Explanation:
Answer:
A 20
B 40
C Ca
D 10
E 9
F F
Explanation:
. 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:
B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O
Explanation:
A redox reaction is one in which oxidation and reduction reactions are occuring simultaneously.
In a redox reaction, an oxidizing agent is reduced ( its oxidation state decreases) whereas a reducing agent is oxidized (it's oxidation state increases).
The nitrogen in the nitrate (v) ion, NO3-, exists in the +5 oxidation state. Therefore it would be acting as an oxidizing agent in any reaction in which it's oxidation state becomes less than +5 after the reaction.
Let us then consider each of the reactions:
A. Reaction 1: in this reaction, the oxidation state of nitrogen remains +5 as what is simply an exchange of radicals in a neutralization reaction.
B. Reaction 2: in this reaction, trioxocarbonate (v) acid oxidizes Copper atom to Copper (ii) ion, while itself it is reduced to Nitrogen (IV) oxide. The oxidation state of nitrogen changes from +5 to +4
C. Reaction 3: in this reaction, what occurs is an exchange of radicals by a displacement reaction. The oxidation state of nitrogen remains the same
D. Reaction 4: in the reaction, what occurs is a neutralization reaction, and the oxidation state of nitrogen remains the same.
Therefore, the correct option is B.
Which particle has no charge
Answer:
Neutron
Explanation:
Name the following compound: CH3 – CH2 – CH2 – CH2 – CH3
Answer:
Pentane
Explanation:
5. What volume would you need to dilute 0.2 L of a 15 M solution to obtain a 3 M
solution?
Answer:
IL
Explanation:
M_1 V_1 = M_2 V_2
M_1 = 15 M
V_1 = 0.2 L
M_2 = 3 M
V_2 = ?
15 x 0.2 = 3V_2
15 x 0.2 = 3
3 / 3V_2
1 L= V_2
1 L is the volume that would be needed to dilute 0.2 L of a 15 M solution to obtain a 3 M solution.
What is volume?A measurement of three-dimensional space is volume. It is frequently expressed quantitatively in SI-derived units, other imperial units, or US customary units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the overall size of a container is typically thought of as its capacity, or the quantity of fluid it could hold.
Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes.
Molarity₁×Volume₁=Molarity₂×Volume₂
15 x 0.2 = 3×Volume₂
15 x 0.2 = 3
3 / 3=Volume₂
1 L=Volume₂
Therefore, 1 L is the volume that would be needed to dilute 0.2 L of a 15 M solution to obtain a 3 M solution.
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Keeping in mind the rules for significant dig-
its, what is the product of 0.6906 m and 4.03
m?
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.
Determine the pH of 0.150 M magnesium hydroxide solution
HELP PLEASE!!!
A solution has a hydrogen ion (or hydronium ion) concentration of 3.16×10−^8 M.
What is the pH of the solution?
a) 7.0
b) 7.5
c) 8.0
d) 8.5
Answer:
The pH of the solution is 7.5
Explanation:
pH, short for Hydrogen Potential, is a parameter used to measure the degree of acidity or alkalinity of a substance.
PH is the measure of the activity of hydrogen ions in solutions and defined as the opposite of the base 10 logarithm or the negative logarithm of the activity of hydrogen ions.
pH= - log [H⁺]
The pH scale ranges from 0 to 14. Values less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral.
In this case, the concentration of the hydrogen ion is:
[H⁺]=3.16*10⁻⁸ M
Replacing in the definition of pH:
pH= - log (3.16*10⁻⁸)
pH= 7.50
The pH of the solution is 7.5
1. Which of the following statements about separation techniques is correct?
A. Physical separation techniques include magnetic attraction, filtration and evaporation.
B. Compounds can be separated into their constituents by physical separation techniques
C. Evaporation is used to separate dissolved solids from a solution.
D. Desalination is a form of physical separation technique for non-potable water.
Answer: A
Explanation:
The statement which is correct about the separation techniques is as follows:
Physical separation techniques include magnetic attraction, filtration, and evaporation.Thus, the correct option for this question is A.
What is the Separation technique?The Separation techniques may be defined as all those techniques that can be utilized in order to separate two different states of matter such as liquid and solid from one another.
Physical separation techniques may include magnetic attraction, filtration, evaporation, chromatography, centrifugation, etc. Chemical separation techniques may include distillation, adsorption, oxidation, crystallization, membrane procedures, etc.
Compounds can be separated into their constituents by chemical separation techniques. Evaporation is used to eliminate water from liquid food products and make them dry. Desalination may be defined as a process of eliminating salt from sea water specifically.
Therefore, the correct option for this question is A.
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Under what conditions of temperature and pressure is a gas most soluble in water?
Answer:
A gas is most soluble in water under conditions of high pressure, and low temperature.
En una determinación cuantitativa se utilizan 17.1 mL de Na2S2O3 0.1N para que reaccione todo el yodo que se encuentra en una muestra que tiene una masa de 0.376 g. Si la reacción que se lleva a cabo es: I2 + 2Na2S2O3 → 2NaI + Na2S4O6 ¿Cuál es la cantidad de yodo en la muestra?En una determinación cuantitativa se utilizan 17.1 mL de Na2S2O3 0.1N para que reaccione todo el yodo que se encuentra en una muestra que tiene una masa de 0.376 g. Si la reacción que se lleva a cabo es: I2 + 2Na2S2O3 → 2NaI + Na2S4O6 ¿Cuál es la cantidad de yodo en la muestra?
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.