Answer:
1.61 × 10⁶ kJ
Explanation:
The human burns energy so as to be healthy.
The amount of energy burnt per day by an adult human is 2 × 20³ kcal per day. Since there is 24 hours in a day, the amount of energy burnt per hour is 2 × 20³ × 24 = 48 × 20³ kcal per hour.
The conversion rate of kcal to kJ is 1 kcal = 4.184 kJ. Therefore converting the kcal per hour to kJ per hour gives:
48 × 20³ × 4.184 = 200.882 × 20³ kJ = 1.61 × 10⁶ kJ
Final answer:
Rate in kJ per hour = 34.93 kJ/hTo convert the rate from kcal per day to kJ per hour, you can multiply the average daily energy burn by the conversion factor of 4.184 kJ/kcal and 1 day/24 hours.
Explanation:
To convert kcal to kJ, we can multiply by a conversion factor of 4.184.
Therefore, to find the rate in kJ per hour, we can multiply the average daily energy burn by the conversion factor for both kcal to kJ and hours to days.
The calculation would be:
Rate in kJ per hour = (2.00x10³ kcal/day) x (4.184 kJ/kcal) x (1 day/24 hours)
The rate in kJ per hour = 34.93 kJ/h
What is solubility?
A solution in which no more solute will dissolve
The amount of solute it takes to make a supersaturated solution.
The amount of solute that will dissolve in a given amount of solvent
The amount of solvent it takes to dissolve 100 g of solute
Answer:
C. The amount of solute that will dissolve in a given amount of solvent.
Explanation:
Solubility is the amount of solute that will dissolve in a given amount of solvent. Option 3 is correct.
A solution is a homogeneous mixture of two or more substances, where the substances are uniformly distributed throughout the mixture.
Solubility is defined as the amount of solute that will dissolve in a given amount of solvent at a specific temperature and pressure. It is usually expressed in terms of grams of solute per 100 grams of solvent, or in terms of the concentration of the solute in the solution.Therefore, the amount of solute that will dissolve in a given amount of solvent is referred to as solubility. The correct answer is option 3.
Learn more about solution here:
https://brainly.com/question/30665317
#SPJ6
CaCl2 + Na2CO3 → CaCO3 + 2 NaCl
1. How many moles of calcium carbonate (CaCO3) are produced when
8.45 moles of calcium chloride react (CaCl2)? *
Answer:
8.45 moles are produced
Explanation:
CaCl₂ + Na₂CO₃ → CaCO₃ + 2 NaCl
From the equation, we can see that for every 1 mole of CaCl₂ and 1 mole Na₂CO₃ will give 1 mole of CaCO₃ and 2 moles of NaCl
to calculate how many moles of CaCO₃ ,we simply multiply multiply each by the 8.45 moles of CaCl₂ which will reacts
these is because for every 1 mole of CaCl₂ and 1 mole Na₂CO₃ will give 1 mole of CaCO₃ and 2 moles of NaCl
therefore we have every 1x8.45(8.45) mole of CaCl₂ and 1x8.45(8.45) mole Na₂CO₃ will give 1x8.45(8.45) mole of CaCO₃ and 2x8.45(16.9) moles of NaCl
8.45 moles are produced in the reaction
Answer:
8.45 moles
Explanation:
The balanced equation for the reaction is given below:
CaCl2 + Na2CO3 → CaCO3 + 2NaCl
From the balanced equation above,
1 mole of calcium chloride (CaCl2) produced 1 mole of calcium carbonate (CaCO3).
Therefore, 8.45 moles of calcium chloride (CaCl2) will also produce 8.45 moles of calcium carbonate (CaCO3)
From the illustration above, 8.45 moles of calcium carbonate (CaCO3) are produced.
Elizabeth were studying the history of cell theory and the contributions of different scientist she made this table to compare two of the scientist which part of scientists and Elizabeth right instead of X and Y
Answer:c. Hooke and Leeuwenhoek
Explanation: I ask and that answer was right I don't know the explanation
Answer:
C. hooke and leruwenhoek
what elements make up a molecule of a glucose?
Answer:
All carbohydrates, including sugar, therefore contain the same three elements: carbon, hydrogen and oxygen. Different arrangements of these elements form single units to make different types of carbohydrates. Glucose, for instance, is a single-unit carb with six carbon atoms, 12 hydrogen atoms and six oxygen atoms.
Explanation:
Final answer:
A molecule of glucose is composed of carbon, hydrogen, and oxygen, with the chemical formula C6H12O6, featuring six carbon atoms, twelve hydrogen atoms, and six oxygen atoms arranged in a specific structure.
Explanation:
The elements that make up a molecule of glucose are carbon (C), hydrogen (H), and oxygen (O). The chemical formula for glucose is C₆H₁₂O₆. This indicates that each glucose molecule consists of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. These elements are arranged in a specific structure where each carbon atom forms four bonds connecting to other carbon atoms, as well as to hydrogen and oxygen atoms. The six carbon atoms form the backbone of the glucose molecule, with the oxygen and hydrogen atoms attached to this carbon chain.
According to cell theory _____.
Answer:
Every single living thing are comprised of cells. Cells are the fundamental units of structure and capacity in living things. New cells are delivered from existing cells.
Which components of the apparatus affect its motion?
Answer:
An internal force acts between elements of the system. ... Only external forces affect the motion of a system, according to Newton's first ... Newton's second law states that a net force on an object is responsible for its ... Prior to manned space flights, rocket sleds were used to test aircraft, missile equipment, and physiological
Explanation:
what is a cause of cemical weathering?
A. sunlight
B. wind
C. gravity
D. acids
Answer:
D. acids
Explanation:
I hope this helped
PLEASE HELP, ON A TIMER!!! WILL MARK BRAINLIEST
Consider the total ionic equation below.
Upper B a superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus, plus 2 upper N a superscript plus, plus upper C upper O subscript 3 superscript 2 minus right arrow upper Ba upper C Upper O subscript 3 plus 2 upper N a superscript plus, plus 2 upper N upper O subscript 3 superscript minus.
Which is the net ionic equation for the reaction?
Upper B a superscript 2 plus, plus upper C upper O subscript 3 superscript 2 minus right arrow upper B a upper C upper O subscript 3.
2 upper N a superscript plus, plus upper C upper O subscript 3 superscript 2 minus right arrow upper N a subscript 2 upper C upper O subscript 3.
Upper N upper O subscript 3 superscript minus, plus upper N a superscript plus right arrow upper N a upper N upper O subscript 3.
Upper B a superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus right arrow upper B a (upper N upper O subscript 3) subscript 2.
Answer:
Upper B a superscript 2 plus, plus 2 upper N upper O subscript 3 superscript minus right arrow upper B a (upper N upper O subscript 3) subscript 2.
I think...
Answer: Upper N upper H subscript 4 superscript plus. and Upper S upper O subscript 4 superscript 2 minus.
Explanation: The spectator ions in this reaction are the ammonium ion and the sulfate ions.
In a reaction, not all of the ions are reacting. The ions not reacting are called the spectator ions.
When we eliminate such ions, we get an overall view of the reaction.
The reaction is:
2NH₄⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ ⇒ 2NH₄⁺ + 2H₂O + SO₄²⁻
In ionic equations, water soluble reactants and products are split into their constituent ions while non-ionizing or gaseous reactants and products are represented as formulae or molecules.
The species that are not reacting and appears on both sides are 2NH₄⁺ and SO₄²⁻ and are the spectator ions.
These non-reactive species are eliminated from the overall ionic equation that shows the reacting ions only.
PLEASE ANSWER !!!
2H2 + O2 —> 2H20 + energy
What type of reaction is represented by this equation ?
- decomposition
-double replacement
-Single replacement
-synthesis
Answer: synthesis reaction.
Explanation:
The type of reaction represented by the equation is synthesis reaction.
Definition of synthesis reactionA synthesis reaction is simply defined as reaction in which two or more substances react to produce a single new substance which has characteristics different from the reactants.
Considering the equation given, we can conclude as follow:
2H₂ + O₂ —> 2H₂0 + energy
The reaction is a synthesis reaction since H₂ and O₂ combined to produce a single product i.e H₂O
Learn more about synthesis reaction:
https://brainly.com/question/24936069
how many grams of Fe can be produced if 12 mol CO and 12 mol Fe2O2 are allowed to react?
3CO(g) + Fe2O3(s) ----> 2Fe(s) + 3CO2(g)
Answer:
Assume that:
n = number of moles
m = mass of substance
M = molar mass (equivalent to atomic weight in the periodic table)
n
=
m
÷
M
The mass (m) of Fe is found.
Your next step is to find the molar mass (M) of Fe.
The molar mass of Fe is 55.9 g/mol.
To find the number of moles for Fe:
n = 112 grams
÷
55.9 g/mol = 2.003577818 moles of Fe(don't round because this is not your final answer or you'll get inaccurate final answer)
Hope it helps you
Plz mark brainliest and follow me ❤❤❤❤
Explanation:
Consider this reaction mechanism: Step 1: Mo(CO)6→ Mo(CO)5 + CO Step 2: Mo(CO)5 + P(CH3)3→ Mo(CO)5P(CH3)3 Which of these is an intermediate
Answer:
Mo(CO)5 is the intermediate in this reaction mechanism.
Explanation:
The reaction mechanism describes the sequence of elementary reactions that must occur to go from reactants to products. Reaction intermediates are formed in one step and then consumed in a later step of the reaction mechanism.
In this reaction mechanism, Mo(CO)5 is the product of 1st reaction and then it is used as a reactant in 2nd reaction. So, Mo(CO)5 is the reaction intermediates.
The overall balanced equation would be,
Mo(CO)6 + P(CH3) ↔ CO + Mo(CO)5 + P(CH3)3
Answer:
In terms of molecularity, Step 1 is
⇒ unimolecular
and Step 2 is
⇒ bimolecular.
Explanation:
EDGE 2023
how many grams of zncl2 will be produced from 32.0 g of zn and 13.0 g of cucl2
Answer: 13.2g of ZnCl2
Explanation:
Which elements make up a water molecule?
hydrogen and nitrogen
oxygen and nitrogen
oxygen and carbon
hydrogen and oxygen
Answer: it’s d on edunuity. (Hydrogen and oxygen)
Explanation:
What to do when tired and can not sleep?
Answer: listen to relaxing music
C. Which molecule is not linear?
a H₂O
b. CO₂
c. N₂
d. Cl₂
Answer:
I think the answer is
(H2O) water molecule
What property is used to calculate the ph of a solution
A. The hydrogen ion concentration in mol/L
B. The hydrogen ion concentration in ppm
C. The hydrogen ion concentration in mg/dL
D. The hydrogen ion concentration in mol/kg
help if u help ill give you a rhino
Final answer:
The pH of a solution is calculated using the hydrogen ion concentration in mol/L (molarity) by taking the negative logarithm of that concentration.
Explanation:
The property used to calculate the pH of a solution is A. The hydrogen ion concentration in mol/L. To calculate pH, we first measure the concentration of hydrogen (H+) ions in moles per liter (molarity). Then, we take the negative logarithm of this concentration to find the pH value. For instance, a concentration of 0.01 M H+ ions results in a pH of 2 because the negative log of 0.01 is 2. The pH scale typically ranges from 0 to 14, with 7 being neutral. A pH less than 7 indicates an acidic solution, while a pH greater than 7 indicates a basic solution.
If 75 ml of water is added to 125 ml of a 0.45 M NaOH solution. what will be the molarity of the diluted solution be?
Vouransion
Answer:
2.25M
Explanation:
C1V1 = C2V2
25×C1 = 125 × 0.45
C1 = 125×0.45/25
C1 = 2.25M
Convert 5 moles H2O to liters
PLEASE HELP!!!!
A foundry worker places a 5.78 kg sheet of cobalt at a temperature of 11°C on top of a 16.6 kg sheet of lead at 63°C. Assuming no heat is lost to the surroundings, calculate the final temperature of the two sheets of metal.
Answer:
35ºC
Explanation:
You need the specif heat capacities of both cobalt and lead.
Specific heat of cobalt: 0.42 J/g.ºCSpecific heat of lead: 0.13 J/g.ºCWhen the two sheets reach the thermal equilibrium their temperatures are equal.
You can use the equations for the thermal heat to find the equilibrium temperature:
Thermal heat released by the hot sheet, lead:
Q = m × C × ΔTQ = 16.6 kg × 0.13J/g.ºC × (63ºC - T)Thermal heat absorbed by the cold sheet, cobalt:
Q = m × C × ΔTQ = 5.78 kg × 0.42J/g.ºC × (T - 11ºC)Equal the two equations to solve for T:
16.6 kg × 0.13J/g.ºC × (63ºC - T) = 5.78kg × 0.42J/g.ºC × (T - 11ºC)I remove the units for easier handling:
135.954 - 2.158T = 2.4276T - 26.70364.5856T = 162.6576T = 35.47ºCRound to 2 significant figures: 35ºC ← answer
If an atom has 17 protons, 14 neutrons, and 20 electrons, what is the atom's electrical charge?
A. -3
B. -4
C. +4
D. -7
Answer:
-3
Explanation:
Which are caused by global warming?
a. Extreme weather conditions
b. Displaced animal habitats
C. Sea level rising
d. All of the above
Vitamin A is a very large organic molecule composed of twenty atoms
of carbon, one atom of oxygen and thirty atoms of hydrogen. How
many atoms total are in TWO molecules of vitamin A.
Select one:
84
68
34
102
Answer:
102
Explanation:
(20+1+30)*2
you add the total number of atoms that can be found in one molecule of vitamin A then multiply by 2
Final answer:
To find the total number of atoms in two molecules of vitamin A, we multiply each type of atom by two and add the totals together, resulting in 102 atoms.
Explanation:
The question is asking to calculate the total number of atoms in two molecules of vitamin A, based on the given composition of one molecule of vitamin A. According to the question, a single molecule of vitamin A contains 20 carbon atoms, 30 hydrogen atoms, and 1 oxygen atom. To find the total number of atoms in two molecules, we simply multiply the number of each type of atom by two and then add up the totals.
For carbon: 20 atoms × 2 = 40 atoms
For hydrogen: 30 atoms × 2 = 60 atoms
For oxygen: 1 atom × 2 = 2 atoms
Adding these together gives us:
40 (carbon) + 60 (hydrogen) + 2 (oxygen) = 102 atoms
PLEASE HELP ME ! A group of students performed an experiment in which they dropped a cube of metal into a graduated cylinder of water. The initial temperature of the water was 25 'C. The mass of the water was 50 g
After energy in the form of heat was transferred to the water, its temperature was 35 C. Based on the evidence, how much energy was transferred between the metal and the water?
0.2 cal
10 cal
so call
• 500 cal
The amount of energy transferred between the metal and the water is 500 cal.
Explanation:The amount of energy transferred between the metal and the water can be calculated using the formula:
Energy = Mass of water × Specific heat of water × Change in temperature
Given that the initial temperature of the water was 25 °C and the final temperature was 35 °C, and the mass of the water was 50 g, we can substitute these values into the formula:
Energy = 50 g × 1 cal/g °C × (35 °C - 25 °C)
= 500 cal
Therefore, 500 cal of energy was transferred between the metal and the water.
At 1.4 atm of pressure a gas has a volume of 111 ML at what pressure will the gas have a volume of 85 ML.
Answer:
The pressure will be 1, 83 atm
Explanation:
We use Boyle Mariotte's formula: for a given mass of gas at constant temperature, the pressure and volume vary inversely proportionally. We convert the unit ml into L: 111/1000= 0,111 L and 85/1000= 0,085 L.
P1xV1=P2xV2
P2= (P1xV1)/V2=(1,4 atm x 0,111L)/0,085L=1,83 atm
What physical property of materials depends on the ability of electrons to move
easily?
A Solubility in water
B Electrical conductivity
C Low melting point
D Brittleness
The physical property that depends on the ability of electrons to move easily is electrical conductivity, which is characteristic of materials like metals that are good conductors of electricity.
B is correct
Explanation:The physical property of materials that depends on the ability of electrons to move easily is electrical conductivity. Materials with high electrical conductivity, such as metals, allow electrons to flow through them with ease, facilitating the flow of electric current.
Examples include silver and copper, which are widely used in electrical wiring and components due to their excellent conductivity. In contrast, materials with low electrical conductivity or insulators, like rubber or glass, do not allow electrons to move freely, inhibiting the flow of electric current.
When considering the options provided, solubility in water and melting points are not directly related to the movement of electrons, and brittleness is a mechanical property that describes how easily a material can break or shatter.
Learn more about Electrical Conductivity here:https://brainly.com/question/31668005
#SPJ2
A sample of gas occupied 250.0 mL at 30.0 C. What volume will it have at 60.0 C, assuming the pressure remains constant?
Answer: 274.75 mL
Explanation:
Initial volume of gas V1 = 250.0 mL
Initial temperature of gas T1 = 30.0 C
Convert temperature in Celsius to Kelvin
(30.0°C + 273 = 303K)
New volume V2 = ?
New temperature T2 = 60.0 C
(60.0°C + 273 = 333K)
Since, volume and temperature are involved while pressure is constant, apply the formula for Charles law
V1/T1 = V2/T2
250.0 mL/303K = V2/333K
Cross multiply
250.0 mL x 333K = 303K x V2
83250 = 303V2
V2 = 83250/303
V2 = 274.75 mL
Thus, the volume will be 274.75 mL
Which electromagnet is stronger and why?
1. List the three states of water shown here.
Answer: solid,liquid & gas
Explanation:
Three states of water
Water in the solid state e.g Ice block
Water in the liquid state e.g fluids
Water in the gaseous state e.g vapour
Which statements describe the inner planets?
Complete Question:
Which statements describe the inner planets? Select three options.
A. Uranus is one of the inner planets.
B. Mercury is one of the inner planets.
C. The inner planets are also called terrestrial planets.
D. The inner planets are larger than the outer planets.
E. Gases escaped from them during the planets’ formation.
Correct Option:
The statements which describe the inner planets are as follows:
B. Mercury is one of the inner planets.
C. The inner planets are also called terrestrial planets.
D. Gases escaped from them during the planets’ formation.
Explanation:
We have the smallest planet in the inner solar system - Mercury, Venus, Earth and Mars, which are so identified for being near to the Sun. A terrestrial planet, a telluric planet, or a rocky planet is a world made up predominantly of rocks of silicate or metal. The outer planets in the solar system are the nearest inner planets to the Earth.
The planets inside are smaller than the outer planets. When the fusion began on the Sun a huge seismic eruption would have originated from the Sun's core and erupted externally. It produced a concussion wave that washed away the inner planets' thick gaseous atmospheres, just like a candle flame bursts out of its wick when you unexpectedly blow.
if you have 0.5 grams of CaCl2 dissolved to make 15mL of solution, what is the molarity of the solution?
Answer:
0.3M
Explanation:
Molarity of a solution is given by;
M=n/v
Where;
n= number of moles of solute = mass of solute / molar mass
v= volume of solution
n= mass of CaCl2 / molar mass of CaCl2
Mass of CaCl2 = 0.5
Molar mass of CaCl2 = 40 + (2×35.5)
= 111g/mol
n = 0.5/111 = 0.0045mol
volume, v= 15mL = 15/1000 L = 0.015L
Note that molarity is in mole per liter, hence we convert 15mL to L. 1mL=1/1000L
M =0.0045/0.015
M=0.3mol/L
Therefore, the molarity of the solution is 0.3M