Answers
Answer:
Chemical digestion is a vital part of the digestive process. Without it, your body wouldn't be able to absorb nutrients from the foods you eat, also chemical digestion uses enzymes to break down food
mechanical digestion involves physical movements, such as chewing and muscle contractions,
Explanation:
Related Questions
How did he show that these particles had a charge on them?
Answers
J.J. Thomson discovered electrons and their negative charge through the cathode ray experiment, leading to the development of the plum pudding model of the atom.
J.J. Thomson, a British physicist, was the first to discover electrons in 1897.
He conducted the cathode ray experiment to identify the negatively charged particles.
The cathode ray tube is a vacuum-sealed glass tube with two electrodes at each end: a cathode and an anode.
When a high voltage electrical current is applied to the electrodes, the tube glows, indicating that the cathode rays are being emitted from the cathode and traveling through the tube towards the anode.
The cathode rays were found to have a negative charge, according to Thomson.
These rays were identified as particles by the presence of a magnet, which caused the particles to bend in the direction opposite to the magnet's polarity.
This discovery indicated that the particles had a charge on them because they were deflected by the magnetic field, which is only possible if the particles have an electric charge.
Thomson further concluded that these particles were about 1,000 times smaller than hydrogen atoms because of the degree of deflection they experienced in the magnetic field.
Furthermore, Thomson created the plum pudding model of an atom, in which electrons are dispersed throughout a positively charged matrix, based on his findings.
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An early version of the Periodic Table had the elements listed in order of increasing relative atomic
mass instead of increasing atomic number. Doing so today would result in the reordering of three
pairs of elements in the first five periods. Identify the three element-pairs.
Answers
Answer:
Although he was unaware ofit, Mendeleev had actually placed the elements inorder of increasing “atomic number,” a numberrepresenting the amount of positively charged protons in the atom (also thenumber of negatively charged electronsthat orbit the atom). Mendeleev went even further.
A piece of metal is heated to 250 degrees then placed in a bucket of water with an initial temperature of 15 degrees. After 10 minutes, the system reaches a point of thermal equilibrium. The water is now 22 degrees. Which of the following is the most likely temperature of the piece of metal?
Answers
Answer: 22 degrees
Explanation:
Most of the information in this question is put there to throw you off- the only important piece of information here is the final temperature of the water.
In a system of say 2, like in this example, whichever object has more energy in the form of heat will transfer that heat to the object with lesser heat if there is an available path to transfer heat between them. Once the two objects are at the same temperature, however, heat can not be transferred from one to another since neither object has more heat than the other to transfer- this is thermal equilibrium.
This question tells us that the system is at thermal equilibrium- when both objects are at the same temperature. Given the temperature of one object, the water, we then know the other object, the metal is the same temperature.
Which of the following represents an exothermic reaction?
Question 5 options:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) + energy
2H2O(l) + energy → 2H2(g) + O2(g)
6CO2(g) + 6H2O(l) + energy → C6H12O6(aq) + 6O2(g)
Answers
Answer:
exothermic reaction is: Reactants → Products + Energy.
Explanation:
Note: ΔH represents the change in energy. If the energy produced in an exothermic reaction is released as heat, it results in a rise in temperature.
conversion from 76 pounds to 1 gram
Answers
Answer:
76 Pounds = 34,473,020 Grams
Answer:
76 Pounds = 34,473,020 Grams
Explanation:
becuase one pound weighs 453.592 grams so i just added up
If 0.225 mol of an ideal gas has a volume of 1923 mL and a pressure of 6.00 atm, what is its temperature in degrees Celsius?
Use one of the following values:
R = 0.0821 atm • L/mol • K
R = 8.31 kPa • L/mol • K
R = 62.4 torr • L/mol • K
Answers
The temperature (in °C) given that 0.225 mole of an ideal gas has a volume of 1923 mL and a pressure of 6.00 atm is 351.6 °C
How do i determine the temperature of the ideal gas?First, we shall list out the various parameters obtained from the question. This is shown below:
Number of mole of ideal gas (n) = 0.225 moleVolume of ideal gas (V) = 1923 mL = 1923 / 1000 = 1.923 LPressure (P) = 6 atmGas constant (R) = 0.0821 atm.L/mol KTemperature of ideal gas (T) =?The temperature of the ideal gas can be obtain as follow:
PV = nRT
6 × 1.923 = 0.225 × 0.0821 × T
11.538 = 0.0184725 × T
Divide both sides by 0.0184725
T = 11.538 / 0.0184725
T = 624.6 K
Subtract 273 to obtain answer in °C
T = 624.6 - 273 K
T = 351.6 °C
Thus, we can conclude that the temperature of the ideal gas is 351.6 °C
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Why should an acid be handled with caution
Answers
Explanation:
acid should be handled with caution because it is dangerous as it may burn the skin
.. How many seconds will it take for a satellite to travel 650 km at a rate of 220 m/s?
Answers
Answer: 3750s Happy To Help
Explanation:
Which of the following is an example of a process that absorbs energy?
gas converting to a liquid
solid coverting to a liquid
a substance freezing
temperature of a substance decreasing
Answers
Answer:
-Gas converting to a liquid
-Solid converting to a liquid
Explanation:
Endothermic process. It's absorb heat
Question 5
Which of the following molecules is carrying oxygen in circulating erythrocytes?
O Memeglobin
O Hemoglobin
O Stemoglobin
O Myoglobin
Question 6
Answers
O Hemoglobin
Explanation:
Hemoglobin (Heme + Globin) The protein hemoglobin is a molecule which is responsible for carrying almost all of the oxygen in the blood.
If a student is titrating 10.0 mL of 1 M HNO3 with 1M NaOH and another students is titrating 10.0 mL of 1 M H2SO4 with 1 M NaOH, would they need the same volume of NaOH to reach the equivalence point? Explain your answer.
Answers
Given the two different titration reactions, the volume of NaOH required to reach the equivalence point of both reaction will be different.
Titration of HNO₃ and NaOHBalanced equation
HNO₃ + NaOH —> NaNO₃ + H₂O
From the balanced equation above,
The mole ratio of the acid, HNO₃ (nA) = 1The mole ratio of the base, NaOH (nB) = 1How to determine the volume of NaOHVolume of acid, HNO₃ (Va) = 10 mL Molarity of acid, HNO₃ (Ma) = 1 MMolarity of base, NaOH (Mb) = 1 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(1 × 10) / (1 × Vb) = 1
10 / Vb = 1
Cross multiply
1 × Vb = 10
Vb = 10 mL
Titration of H₂SO₄ and NaOHBalanced equation
H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2How to determine the volume of NaOHVolume of acid, H₂SO₄ (Va) = 10 mL Molarity of acid, H₂SO₄ (Ma) = 1 MMolarity of base, NaOH (Mb) = 1 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(1 × 10) / (1 × Vb) = 1/2
10 / Vb = 1/2
Cross multiply
1 × Vb = 10 × 2
Vb = 20 mL
Conclusion Titration of HNO₃ and NaOH required 10 mL of NaOH Titration of H₂SO₄ and NaOH required 20 mL of NaOHFrom the above calculations, we can conclude that different volume of NaOH will be required for the different reaction.
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Which model of the solar system is shown here?
Answers
Answer: C
Explanation: hope this helps
The model of the solar system that is shown here is:
C. Geometric model
Model for description of earth and other entites
Geometric model:In astronomy, the geocentric model is a superseded description of the Universe with Earth at the center. Under the geocentric model, the Sun, Moon, stars, and planets all orbit Earth.
Characteristics:
the Earth is the focal point of the universe and it is fixed,the planets, the Sun, and the stars spin around the Earth,the circle and the circle are "awesome" shapes, so all movements overhead ought to follow roundabout ways, which can be credited to objects being appended to circular shells.Thus, option C is correct.
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how many grams of hydrogen in 1.85moles
Answers
Was rays birthday lit
Answers
Answer:
Yes.
Explanation:
Yes.
Answer:10-1707
Explanation:
How is the atomic mass of an element related to a mole?
O A. The atomic mass, in grams, is the mass of 6.02 x 1023 moles.
O B. The atomic mass, in grams, is the mass of 6.02 x 1023 electrons.
O C. The atomic mass, in grams, is the mass of one mole of atoms.
O D. The atomic mass, in grams, is the mass of one mole of protons.
Answers
Answer:
i the answer to your question should be C
Explanation:
Hope this helps!
The atomic mass of an element related to a mole in grams, is the mass of one mole of atoms. Therefore, option C is correct.
What is an atomic mass ?An atom's mass is its atomic mass. Although the kilogramme is the SI measure of mass, the unified atomic mass unit, or dalton, is a common way to express atomic mass. An unbound carbon-12 atom in its ground state has a mass of 112 of a Da.
A mass that is one-twelfth the mass of an atom of carbon-12 is known as an atomic mass unit. Any isotope of any element's mass is represented in terms of the carbon-12 reference standard.
The size of an atom is indicated by its atomic mass. Technically speaking, an atom's mass is the total weight of its protons, neutrons, and electrons.
Thus, option C is correct.
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Identify the control group the experimental group the independent variable and the dependent variable
A company wants to test a new dog food that’s aid supposed to help overweight dogs lose weight. 50 dogs are chosen to get the new food and 50 more continue their normal diets after one month the dogs are checked to see if they lose any weight
Answers
Experiments group: 50 dogs chosen to eat the new food
Independent variable: dog food
Dependent variable: the dogs’ weight
3. A solution of hydrochloric acid is made by dissolving hydrogen chloride gas in 100.0ml water. This solution neutralizes a 15ml sample of 0.10 mol/L sodium carbonate solution. a. What mass of hydrogen chloride gas was dissolved in 100.0ml of water? b. What volume of hydrogen chloride was this?
Answers
Okay, here are the steps to solve this problem:
a) To neutralize 15ml of 0.10 mol/L sodium carbonate solution, the hydrochloric acid solution must contain 0.015 moles of HCl.
Since the HCl solution is made by dissolving HCl gas in 100ml water, we can calculate the moles of HCl gas dissolved in 100ml:
0.015 moles HCl / 15ml sodium carbonate solution = X moles HCl gas / 100ml HCl solution
X = 0.015 * (100/15) = 0.01 moles HCl gas
b) Molar volume of HCl gas at STP is 24.45 L/mol.
So the volume of 0.01 moles HCl gas is: 0.01 moles * 24.45 L/mol = 0.2445 L
Since the solution is made with this gas in 100ml water, the volume of HCl gas dissolved in 100ml water is 0.2445 L.
So the final answers are:
a) 0.01 moles of HCl gas
b) 0.2445 L of HCl gas
Please let me know if you have any other questions!
Sulfur (S) has an atomic number of 16. What is the ground-state electron configuration of sulfur?
Answers
Which type of change, chemical or physical, is a change on the atomic level?
Answers
Explanation:
Examples of chemical changes include, rusting, fire, and overcooking. Nuclear changes occur when the nuclei of atoms are rearranged to form new atoms. Examples of nuclear changes include atomic fission, nuclear fusion, and the energy of sun and stars.
What Science and Math jobs are expected to have much faster than average growth? Check all that apply.
1.Natural Sciences Managers
2.Zoologists and Wildlife Biologists
3.Medical Scientists
4.Food Science Technicians
5 .Biochemists and Biophysicists
6.Mathematical Technicians
Answers
Answer:
3.Medical Scientists
5.Biochemists and Biophysicists
Explanation:
Science and Math jobs are expected to have much faster than average growth. Medical Scientists and Biochemists and Biophysicists is correct.
What is biochemist ?Scientists with biochemistry training are known as biochemists. They research the chemistry of living things, including chemical reactions and changes. Biochemists research DNA, proteins, and cellular components. A portmanteau of "biological chemist" is the term "biochemist."
The study of biochemistry focuses on the chemistry of living things. It is a lab-based science that combines chemistry and biology.
Biochemists investigate the makeup, chemistry, and chemical processes of the compounds found in living things in order to understand how they work and how to manipulate them.
Thus, option 3 and 5 both are correct.
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Phosphorus forms two oxides, which have the empirical formulae of P2O3 and P2O5.
a. Which oxide contains the higher percentage of phosphorus? (Show your calculation)
b. What mass of phosphorus will combine with 1mole of oxygen molecules to form P2O3?
c. What is the molecular formula of the oxide that has a formula mass of 284?
d. Suggest a molecular formula for the other oxide.
Answers
The mass percentage is an important method to determine the concentration of a solution. Here among P₂O₃ and P₂O₅, the oxide P₂O₃ contains higher percentage of phosphorous.
What is mass percentage?The mass percentage of a component can be defined as the ratio of the mass of that particular component in the compound to the total mass of the compound. It can be expressed as:
Mass percentage = Mass of the component / Total mass of the component × 100
Molar mass of P₂O₃ = 110 g/mol
Molar mass of P₂O₅ = 142 g/mol
a. % of 'P' in P₂O₃ = 2 × 31 / 110 × 100 = 56.4 %
% of 'P' in P₂O₅ = 2 × 31 / 142 × 100 = 43.66 %
Thus P₂O₃ has higher percentage of 'P'.
b. 1 mol O₂ × 4 P /3 O₂ × 31.0 P / 1 mol P = 41.3 g P
c. P₄O₁₀
d. Aluminium oxide - Al₂O₃
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The first chemical equation was designed by
Answers
Answer:
Jean Beguin
Explanation:
The first chemical equation was diagrammed by Jean Beguin in 1615.
What mass of NaCl is in 1.25L of 0.1035M solution?
Answers
Answer:
Explanation:
To determine the mass of NaCl in 1.25L of 0.1035M solution, we can use the formula:
mass = concentration x volume x molar mass
where concentration is in molarity (M), volume is in liters (L), and molar mass is in grams per mole (g/mol).
The molar mass of NaCl is 58.44 g/mol.
Plugging in the given values, we get:
mass = (0.1035 M) x (1.25 L) x (58.44 g/mol)
mass = 7.3188 g
So, there is approximately 7.3188 grams of NaCl in 1.25L of 0.1035M solution.
6. How many grams of KNO3 are produced from 134g of Ca(NO3)2 ?
K3PO4 +Ca(NO3)2 → KNO3 + Ca3(PO4)2
Answers
Tribasic Potassium Phosphate + Calcium Nitrate = Tuite + Potassium Nitrate
2 moles of aqueous Tribasic Potassium Phosphate react with 3 moles of aqueous Calcium Nitrate to form 1 mole of solid Tuite and 6 moles of aqueous Potassium Nitrate
Reaction Type
Double Displacement (Metathesis)
Net Ionic Equation
2K3PO4 + 3Ca(NO3)2 = Ca3(PO4)2 + 6KNO3 might be an ionic equation. Calculate the net ionic equation for 2K3PO4(aq) + 3Ca(NO3)2(aq) = Ca3(PO4)2(s) + 6KNO3(aq).
Redox (Oxidation-Reduction) Reaction
K3PO4 + Ca(NO3)2 = Ca3(PO4)2 + KNO3 might be a redox reaction.
Reactants
Tribasic Potassium Phosphate - K3PO4
E340Iii E340(Iii) Potassium Phosphate Tripotassium Phosphate K3PO4 Molar Mass K3PO4 Oxidation Number
Calcium Nitrate - Ca(NO3)2
Saltpeter Lime Nitrate Lime Saltpeter Norge Saltpeter Norway Saltpeter Calcium Saltpeter Norwegian Saltpeter Anhydrous Calcium Nitrate Ca(NO3)2 Molar Mass Ca(NO3)2 Oxidation Number
if the body is moving with uniform acceleration then, eng of motion are given as s = u+v/2+t
Answers
Yes, s = u+v/2+t, where s is the displacement, u is the beginning velocity, v is the end velocity, and t is the time required, is the equation of motion for a body travelling with uniform acceleration.
The basic law of motion, which states that a body's rate of change in displacement is directly proportional to its velocity, provides the basis for this equation. The equation of motion for a body travelling with constant acceleration, s = ut + 1/2at2, may be used to derive it.
The equation of motion for a body travelling with uniform acceleration is given by replacing the value of an as (v-u)/t and getting s = u+v/2+t. This formula is only accurate when the body's acceleration is constant and uniform.
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What is the mass of 1.78 moles of O2
Answers
Answer:
56.96 grams
Explanation:
To find the mass of 1.78 moles of O2, we need to use the molar mass of O2, which is the mass of one mole of O2.
The chemical formula for O2 is O-O or simply O2. The molar mass of O2 is the sum of the atomic masses of two oxygen atoms, which can be found on the periodic table.
The atomic mass of oxygen (O) is approximately 16.00 g/mol. So the molar mass of O2 is:
Molar mass of O2 = 2 x atomic mass of O
= 2 x 16.00 g/mol
= 32.00 g/mol
Therefore, the mass of 1.78 moles of O2 is:
Mass = number of moles × molar mass
= 1.78 mol × 32.00 g/mol
= 56.96 g
So the mass of 1.78 moles of O2 is 56.96 grams.
Write the two possible conversion factors using Avogadro's number:
Answers
One mole of a substance is equal to 6.022 × 10²³ units of that substance The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.
What is the conversion for Avogadro's number?Hence, the first conversion is the number fundamentally which is 6.022x1023 particles 1 mole to convert an integer of moles to particles and the other one is the reciprocal of Avogadro's number which is 1 mole 6.022x1023 particles to convert a number of specks to a number of moles.
The word mole mentions Avogadro's number of a substance. For example, a mole of carbon-12 atoms happens to be 12 grams. Moreover, a mole of hydrogen particles is 2 grams while a mole of hydrogen conversion atoms occurs to be 1 gram.
So we can conclude that conversion allying Avogadro's Number of Atoms to Moles and Vice Versa
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The two possible conversion factors using Avogadro's number are:
From moles to number of particles:1 mole = Avogadro's number of particles
So, the conversion factor is Avogadro's number of particles/mole.
From number of particles to moles:1 mole = Avogadro's number of particles
So, the conversion factor is 1 mole/Avogadro's number of particles.
What is Avogadro's number?Avogadro's number is described as the number of atoms, ions, or molecules in one mole of a substance.
The Avogadro constant has defining constant with an exact value of 6.02214076×10²³ reciprocal moles.
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This time, include both the coefficient and exponent. Express 0.00212 in scientific notation.
[?] * times 10^[?]
Enter the coefficient in the green box and the exponent in the yellow box.
Coefficient (green) Exponent (yellow)
_______________ _____________ Enter
![This time, include both the coefficient and exponent. Express 0.00212 in scientific notation.[?] * times](https://i5t5.c14.e2-1.dev/h-images-qa/contents/attachments/lnMi2a3nGuhR8UXZWuiEWNQeM7a27uTR.jpeg)
Answers
Answer: 212
Explanation:
What is the correct equilibrium constant expression for the following reaction? 3A2 = 2B3 when the reaction started with the initial concentrations of A2 = 3 M and B3 = 2 M and continued until the equilibrium concentrations of A2 = 2.5 M and B3 = 2.5 M
Answers
Answer:
Kc = [B₃]²/[A₂]³ = 0.40
Explanation:
3A₂ ⇄ 2B₃
Given at equilibrium => [A₂] =2.5 and [B₃] = 2.5
Kc = [B₃]²/[A₂]³ = (2.5)²/(2.5)³ = (2.5)⁻¹ = 0.40
why does air blowfrom one place to another class 8
Answers
as air particles have a very large intermolecular spaces and as the intermolecular force of attraction in between its particles is much weaker and that's why the particles are always in random movements due to they possess a high kinetic energy as the intermolecular space is large in between each air molecules that is why air can easily blow from one place to another