Answers
Related Questions
What is the law of conservation of energy?
a) Energy can be created or destroyed.
b) Energy can be created but it can never be destroyed even when it transforms to another type.
c) Energy can neither be created nor destroyed; it transforms into another type.
d) Energy can never be created but it can be destroyed when it transforms to another type.
Answers
Describe an organic molecule.
Answers
Answer: molecule of the kind normally found in living systems. Organic molecules are usually composed of carbon atoms in rings or long chains, to which are attached other atoms of such elements as hydrogen, oxygen, and nitrogen.
Explanation:
will mark brainliest! How many sodium atoms are there in 26.3 grams of sodium oxide (Na2O)?
The answer is 2.55 E 23 molecules, but work must be shown.
Answers
Answer:
[tex]{5.11 * 10^{23} atoms Na}[/tex]
Explanation:
[tex]{26.3 g} {Na_{2}O}[/tex] * [tex]\frac{1 mol Na_{2}O}{61.979 g Na_{2}O}[/tex] * [tex]\frac{2 mol Na}{1 mol Na_{2}O}[/tex] * [tex]\frac{6.022*10^{23} atoms Na}{1 mol Na}[/tex]
= [tex]{5.11 * 10^{23} atoms Na}[/tex]
Consider the reaction of C6H6 + Br2 -------> C6H5Br + HBr
What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 71.7 g of Br2?
Answers
The theoretical yield of C₆H₅Br = 70.336 g
Further explanationGiven
42.1 g of C₆H₆
71.7 g of Br2
Required
The theoretical yield
Solution
Reaction
C₆H₆ + Br₂ ⇒ C₆H₅Br + HBr
mol C₆H₆ :
= mass : MW C₆H₆
= 42.1 g : 78 g/mol
= 0.54
mol Br₂ :
= 71.7 g : 160 g/mol
= 0.448
Limiting reactant : Br₂(smaller mol)
mol C₆H₅Br based on Br₂ as a limiting reactant = 0.448
Mass C₆H₅Br :
= 0.448 x 157 g/mol
= 70.336 g
Answer number 5 please if you say for point I will report you:)
Answers
Answer:
A
Explanation:
Lighting a fireworks the potential energy is converted to all forms of energy like light, heat and sound energy
In which of the following situations would it be helpful to create a line graph?
A. When comparing a patient's baseline blood pressure to his blood
pressure while walking
B. When illustrating how much time a patient spends exercising
versus doing other activities
C. When recording a patient's height and weight during one visit
D. When measuring a patient's height growth over 10 years
Answers
Answer:
When measuring a patient's height growth over 10 years
Explanation:
Where would the electrons in the 3d sublevel be found? Possibly in any shell only in the n = 3 energy level in energy levels > 3
Answers
Answer:
In the n = 3 energy level
Explanation:
There's is no further explanation for this.
All the electrons in an energy level are distribuited according to the period in the periodic table they are.
So, if we have an atom in period 1, like Hydrogen (H), that atom would only have 1 level energy (n = 1) and in that level, we only have the sub level 1s.
Electrons in the 3d sublevel, are found mostly in all the transition metals of period 3, and it can go from 1 to 10 electrons. To be with the 3d sub level it's neccesary that the energy level to be 3.
energy levels beyond that, like n = 4, we have electrons occupying the 3d sub level, so, primordly, the 3d is found only in energy level 3.
Hope this helps
Answer:
Only in the n = 3 energy level
Explanation:
. A compound is composed of 2 atoms of Copper, 1 atom of Sulfur and 4 atoms of Oxygen. What
is the chemical formula for this compound?
Answers
The chemical formula for this compound : Cu₂SO₄-Copper(I) sulfate
Further explanationGiven
2 atoms of Copper, 1 atom of Sulfur and 4 atoms of Oxygen.
Required
The chemical formula
Solution
The number of atoms forming a compound is usually indicated from the subscript in the formula
From the problem it can be seen that the compound has:
2 atoms of Cu, 1 atom of S, and 4 atoms of O
So the formula:
Cu₂SO₄
Pls help I need the answers
Answers
Answer:
is this a worksheet or something
Explanation:
Calculate the mass in grams of CO2 are formed if
89.6 liters of CH4 are used up at S.T.P?
(Hint: At S.T.P., one mole of any gas occupies a
volume of 22.4 liters).
Answers
Answer:
Mass = 176 g
Explanation:
Given data:
Volume of CH₄ = 89.6 L
Mass of CO₂ formed = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
one mole of any gas at STP occupy 22.4 L volume.
number of moles of CH₄ that occupy 89.6 L = 89.6/22.4 = 4 mol
Now we will compare the moles of CH₄ and CO₂:
CH₄ : CO₂
1 : 1
4 : 4
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 4 mol × 44 g/mol
Mass = 176 g
b.Calculate the mass in grams of CO2 are formed it
44.8 liters of CH4 are used up at S.T.P?
(Hint: At S.T.P., one mole of any gas occupies a
volume of 22.4 liters).
Answers
The mass in grams of CO₂ : 88 g
Further explanationGiven
44.8 liters of CH₄
Required
mass of CO₂
Solution
Reaction
CH₄ + 2O₂ → CO₂ + 2H₂O.
mol CH₄ :
= 44.8 : 22.4
= 2
From equation, mol ratio CH₄ : CO₂ = 1 : 1, so mol CO₂ = 2
Mass CO₂(MW = 44 g/mol) :
= mol x MW
= 2 x 44
= 88 g
Highlight the claim.
A common type of asexual reproduction found in nature is called Mitosis. Mitosis requires less energy than sexual reproduction does. Mitosis can
occur in seconds and does not require a mate to reproduce. Sexual reproduction requires two compatible parents. It also requires time to produce
the egg and sperm cells and then for fertilization to occur. Energy is required to find a compatible mate, produce sex cells, and for fertilization
Therefore Mitosis requires less energy than sexual reproduction does.
Answers
Answer:
The claim is: Therefore Mitosis requires less energy than sexual reproduction does.
Explanation:
Determine the number of moles in each substance.
a. 3.25 x 1020 atoms of lead
b. 4.96 x 1024 molecules of glucose
c. 1.56 x 1023 formula units of sodium hydroxide
d. 1.25 x 1025 copper(ll) ions
Answers
Answer:
a) 5.4 * 10^-4 moles
b) 8.2 moles
c) 0.26 moles
d) 20.76 moles
Explanation:
a)Since 1 mole of a substance has 6.02 * 10^23 atoms
x moles is present in 3.25 x 1020 atoms of lead
3.25 x 1020 atoms of lead/6.02 * 10^23 atoms = 5.4 * 10^-4 moles
b) Since 1 mole of a substance has 6.02 * 10^23 molecules
x moles is present in 4.96 x 1024 molecules of glucose
x = 4.96 x 1024 molecules of glucose/6.02 * 10^23 molecules = 8.2 moles
c) Since 1 mole of a substance has 6.02 * 10^23 formula units
x moles is present in 1.56 x 1023 formula units of sodium hydroxide
x = 1.56 x 1023 formula units /6.02 * 10^23 = 0.26 moles
d) Since 1 mole of a substance has 6.02 * 10^23 ions
x moles is present in 1.25 x 1025 copper(ll) ions
x = 1.25 x 1025 copper(ll) ions/6.02 * 10^23 ions = 20.76 moles
The number of moles in lead is 5.40 × 10⁻⁴ moles
The number of moles in glucose is 8.24 moles
The number of moles in sodium hydroxide is 0.259 moles
The number of moles in copper (II) ions is 20.76 moles
The number of moles of a substance is equal to 6.022 × 10²³ atoms. The number of moles of each given substance can be calculated by relating it to the Avogadro's constant 6.022 × 10²³ atoms.
Starting with a from the given parameters, we have:
a)1 mole of substance = 6.022 × 10²³ atomsx mole present in = 3.25 × 10²⁰ atoms of leadMaking x the subject of the formula, we have:
[tex]\mathbf{x = \dfrac{1 \ mole \times 3.25 \times 10^{20} \ atoms }{6.022 \times 10^{23} \ atoms}}}[/tex]
x = 5.40 × 10⁻⁴ moles
b)1 mole of substance = 6.022 × 10²³ moleculesx moles present in = 4.96 ×10²⁴ molecules of glucose[tex]\mathbf{x = \dfrac{1 \ mole \times 4.96 \times 10^{24} \ molecules }{6.022 \times 10^{23} \ molecules}}}[/tex]
x = 8.24 moles
c) 1 mole of substance = 6.022 × 10²³ moleculesx moles present in = 1.56 × 10²³ units of NaOH[tex]\mathbf{x = \dfrac{1 \ mole \times 1.56 \times 10^{23} \ units}{6.022 \times 10^{23} \ units}}}[/tex]
x = 0.259 moles
d)1 mole of substance = 6.022 × 10²³ moleculesx moles present in = 1.25 × 10²⁵ copper ions[tex]\mathbf{x = \dfrac{1 \ mole \times 1.25 \times 10^{25} \ ions }{6.022 \times 10^{23} \ ions}}}[/tex]
x = 20.76 moles
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IF CORRECT ILL GIVE BRAINLIEST
My favorite student mixes a white solid and a clear liquid together. Which observations are evidence that a chemical reaction has occurred?
A. The mixture begins to bubble and fizz
B. The solid disappears into the liquid
C. The mixture begins to smoke
D. The mixture becomes orange
Answers
Answer: it’s B I belive the other ones are physical changes
Explanation:
Answer:
B
I could be wrong bc it could be a regular powder and I guess maybe the powder will disappear and then change color to weird looking white liquid or just disappear completely depending how much you put in
Which gives a better measure of the pH: universal PH paper or a pH meter?
Answers
I know this is a lot to ask for but please help me!!
Answers
2) Mitochondria
3) developed country
4) metabolic process
5) cellular respiration
6) poverty
7) overpopulation
8) standard of living
Study the chemical reaction.
4Fe + 3O2 → 2Fe2O3
What is the mole ratio between Fe and O2?
Answers
Answer: The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The given balanced chemical equation is :
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
Thus 4 moles of iron (Fe) reacts with 3 moles of oxygen gas [tex](O_2)[/tex] to give 2 moles of ferric oxide [tex](Fe_2O_3)[/tex]
The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]
water and ammonia are polar. The hydrogen atoms in each have a slight positive charge. What does that tell you about the oxygen atom in water and the nitrogen atom in ammonia?
Answers
Answer:
More electronegative
Explanation:
The oxygen and nitrogen in ammonia shows that they are more electronegative than the hydrogen atoms.
Electronegativity shows the affinity of an atom for valence electrons. Electronegativity is the measure of the relative tendency with which the atoms of the element attract valence electrons in a chemical bond.The oxygen atom in water and the nitrogen atom in ammonia are more electronegative.
They attract the electrons more and they then become negatively charged.
The hydrogen will then become positively charged in the shared covalency.
What description explains how pollen is received? Question 14 options: The ovule at the top of the pistil receives pollen. The stigma at the top of the pistil receives pollen. The pistil at the top of the stamen receives pollen. The stamen at the top of the pistil receives pollen.
Answers
Answer:
The correct answer is - the stigma at the top of the pistil receives pollen.
Explanation:
Pollination or transfer of the pollen from one flower to another occurs naturally with the help of the animals, insects, or wind. With the help of these carriers, pollen moves from the flower to the one plant to the receptive surface of the stigma of other plants.
Stigma is the sticky top of the pistils which receives the pollen and starts fertilization by growing a tube to the ovary through the style (long neck between the stigma and ovary) called pollen tube.
NO2 and CO2 have a similar molecular weight. Which gas would you predict to deviate from an ideal
gas? Justify your selection.
Answers
Answer:
NO2
Explanation:
Gases are known to deviate from ideal gas behavior as a result of intermolecular interaction between gas particles. The greater the magnitude of such intermolecular interaction, the greater the degree of deviation of the gas from the ideal gas law.
Now given that CO2 has dipoles that cancel out, the molecule is not really polar because it has no dipole moment. This is unlike NO2 that has a dipole moment and greater intermolecular interaction.
For the reason stated above, NO2 deviates more from ideal gas behaviour compared to CO2.
CO2 has dipoles that cancel out so the molecule is not really polar because it has no dipole moment. NO2 has a dipole moment and greater intermolecular interaction. NO2 deviates more from ideal gas behavior compared to CO2.
Determine the number of representative particles in each substance.
a. 4.45 mol of C6H1206
b. 0.250 mol of KNO3
c. 2.24 mol of H2
d. 9.56 mol of Zn
Answers
Answer:
a) 26.79 * 10^23 particles
b) 1.51 * 10^23 particles
c) 13.5 * 10^23 particles
d) 57.6 * 10^23 particles
Explanation:
a) 1 mole of a substance contains 6.02 * 10^23 particles
4.45 mol of C6H1206 contains 4.45 * 6.02 * 10^23 particles = 26.79 * 10^23 particles
b) 1 mole of a substance contains 6.02 * 10^23 particles
0.250 mol of KNO3 contains 0.250 * 6.02 * 10^23 particles = 1.51 * 10^23 particles
c) 1 mole of a substance contains 6.02 * 10^23 particles
2.24 mol of H2 contains 2.24 * 6.02 * 10^23 particles = 13.5 * 10^23 particles
d) 1 mole of a substance contains 6.02 * 10^23 particles
9.56 mol of Zn contains 9.56 * 6.02 * 10^23 particles= 57.6 * 10^23 particles
A. The number of particles in 4.45 moles of C₆H₁₂O₆ is 2.68×10²⁴ particles.
B. The number of particles in 0.250 mole of KNO₃ is 1.51×10²³ particles.
C. The number of particles in 2.24 moles of H₂ is 1.35×10²⁴ particles.
D. The number of particles in 9.56 moles of Zn is 5.76×10²⁴ particles.
From Avogadro's hypothesis, we understood that:
1 mole of any substance = 6.02×10²³ particles
With the above information in mind, we can obtain the answers to the questions as follow:
A. Determination of the number of particles in 4.45 moles of C₆H₁₂O₆.
1 mole of C₆H₁₂O₆ = 6.02×10²³ particles
Therefore,
4.45 moles of C₆H₁₂O₆ = 4.45 × 6.02×10²³
4.45 moles of C₆H₁₂O₆ = 2.68×10²⁴ particles
B. Determination of the number of particles in 0.250 mole of KNO₃
1 mole of KNO₃ = 6.02×10²³ particles
Therefore,
0.250 mole of KNO₃ = 0.250 × 6.02×10²³
0.250 mole of KNO₃ = 1.51×10²³ particles
C. Determination of the number of particles in 2.24 moles of H₂
1 mole of H₂ = 6.02×10²³ particles
Therefore,
2.24 moles of H₂ = 2.24 × 6.02×10²³
2.24 moles of H₂ = 1.35×10²⁴ particles
D. Determination of the number of particles in 9.56 moles of Zn
1 mole of Zn = 6.02×10²³ particles
Therefore,
9.56 moles of Zn = 9.56 × 6.02×10²³
9.56 moles of Zn = 5.76×10²⁴ particles
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A carbon atom has six protons, six neutrons, and six electrons. How would a Bohr model show the protons in a carbon atom?
A) The particles are evenly distributed through the mass of carbon.
B) Electrons from a cloud around a nucleus of protons and neutrons.
C) Neutrons revolve around a nucleus of electrons and protons.
D) Electrons move in fixed orbits around a nucleus of protons and neutrons.
Answers
Answer:
D
Explanation:
The Bohr model show the protons in a carbon atom using the model; "Electrons move in fixed orbits around a nucleus of protons and neutrons."
According to Bohr's model of the atoms, the Rutherford model is basically correct. This implies that Bohr model accepts the idea of a nucleus containing nucleons(protons and neutrons).
In addition, the model also postulates that electrons are found in fixed orbits. These fixed orbits are called energy levels or shells.
A graphic description of this is shown in the image attached to this answer.
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Can someone help me with these two questions
Answers
Answer: there are 12 atoms of carbon. An example of an element is iron and an example of a compound is NaCl (salt)
Explanation:
6. element= silver , compound= water
A student lifts her 2 kg backpack up 2 m with a force of 2 N. How much work does she complete?
a) 0 J
b) 4 J
c) 1 J
d) 8 J
Answers
Answer:
I think 4j isn't it she does a work
Answer:
4 J
Explanation:
because work done equal to force × time taken
Consider the reaction of 35.0 g of iron as follows:
4Fe + 3O2 --> 2Fe2O3
How many moles of iron react?
How many moles of oxygen molecules must react?
How many moles of product form?
What mass of product forms?
Answers
Explanation:
4Fe + 3O2 --> 2Fe2O3
Mass of iron = 35g
How many moles of iron react?
The relationship between mass and moles is given as;
Moles = mass / Molar mass
Molar mass of iron = 56g/mol
Number of moles = 35 / 56 = 0.625 mol
How many moles of oxygen molecules must react?
From the equation of the reaction;
4 mol of Fe reacts with 3 mol of Oxygen molecule
0.625 mol would react with x mol?
4 = 3
0.625 = x
x = 0.625 * 3 / 4 = 0.46875 mol
How many moles of product form?
From the equation of the reaction;
4 mol of Fe reacts to form 2 mol of Fe2O3
0.625 mol would form x mol of Fe2O3
4 = 2
0.625 = x
x = 0.625 * 2 / 4 = 0.3125 mol
What mass of product forms?
Moles = mass / Molar mass
Mass = Molar mass * Moles = 159.69 g/mol * 0.3125 mol = 49.9g
An air plane is flying at a crusing speed of 200 miles per hour for 3 hours. How far would the plane fly?
Answers
What does a catalyst do in the Haber process?
A. It increases the pressure of the reaction.
B. It speeds up the reaction that produces ammonia.
C. It is used to turn ammonia into fertilizer and explosives. D. It makes increasing temperature favorable for making ammonia.
Answers
Answer:
B. It speeds up the reaction that produces ammonia
Explanation:
i took the quiz
It speeds up the reaction that produces ammonia. Hence, option B is correct.
What is a catalyst?A catalyst is a substance that allows the chemical reaction to occur at a faster rate or under different conditions (e.g. at a lower temperature) without being affected by the reaction.
A catalyst enables a chemical reaction to proceed at a usually faster rate or under different conditions.
Hence, It speeds up the reaction that produces ammonia.
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What is the formula of francium & fluoride?
Answers
Answer:
The Chemical Formula for Cadmium Fluoride is CdF2. What is the formula for francium permanganate? The compound francium permanganate has the chemical formula FrMnO4.
Explanation:
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, FrF is the formula of francium & fluoride.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The chemical compound formed using francium & fluoride is FrF. Flourine and Francium is very reactive element.
Therefore, FrF is the formula of francium & fluoride.
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2 Caz (PO4)2
How many phosphorus atoms are there in the
picture?
Answers
Answer:
4 phosphorus
Explanation:
The given compound is:
2Ca₃(PO₄)₂
We have been given 2 moles of Ca₃(PO₄)₂ . The number of atoms is the same as the number of elements present within the compound. Since this is 2 moles, we multiply every number of atoms by 2;
2Ca₃(PO₄)₂
Ca : 2 x 3 = 6 atoms
P : 2 x 2 = 4 atoms
O: 2 x (2 x 4) = 16 atoms
So we have 4 phosphorus atoms
Which statement describes how this example is an application of Newton's laws of motion? According to Newton's first law of motion, the balloon continues moving until the forces on it are unbalanced. According to Newton's third law of motion, the balloon is pushed forward as the air is forced out. According to Newton's third law of motion, the balloon resists any change of motion unless an unbalanced force acts upon it. According to Newton's second law of motion, the balloon exerts a force on the air, which exerts a force back on the balloon.
Answers
Answer: The answer is C edu
Explanation:
The statement describes how this example is an application of Newton's laws of motion is According to Newton's third law of motion, the balloon resists any change of motion unless an unbalanced force acts upon it. Therefore, option C is correct.
What is newtons law ?The three fundamental laws of classical mechanics known as Newton's laws of motion describe how an object's motion and the forces acting on it interact. The following is a paraphrasing of these laws: Unless a force acts upon a body, it remains at rest or in continual straight-line motion.
The motion of an item is related to the forces operating on it by Newton's equations of motion. According to the first law, until a force acts on an item, it will not alter its motion.
According to the second law, an object's force is determined by multiplying its mass by its acceleration. According to the third law, when two objects interact, they exert equal-sized and opposite-direction pressures upon one another.
Thus, option C is correct.
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