The mass needed is [223] g O₂.
M_r: 26.98 32.00
4Al + 3O₂ ⟶ 2Al₂O₃
n/mol: 9.30
Moles of O₂ = 9.30 mol Al × (3 mol O₂/4 mol Al) = 6.975 mol O₂
Mass of O₂= 6.975 mol O₂× (32.00 g O₂/1 mol O₂) = 223 g O₂
An atom with 16 protons must be:
A. oxygen
B. selenium
C. sulfur
D. can't tell
C. Sulfur
Is the answer.
your answer is sulfur because the atomic number is the same as protons!
plz mark as brainliest
Does H₂ have a coefficient?
Yes or No
Is Does not have a Coefficient so it would be No
Which element is likely to be the most reactive?
1bromine
2chlorine
3fluorine
4iodine
Answer:
c fluorine
Explanation:
choices for images
A.
The reaction between A and B is reactant favored.
B.
The amount of product is greater than the amount of reactant.
C.
The reaction uses all its reactants to form products.
D.
The reaction reaches equilibrium at 1.5 seconds.
E.
The amount of reactants is highest at equilibrium.
#2
This chemical equation is not balanced:
AgBr(s) → Ag(s) + Br2(g).
Why isn’t it possible for the reaction to occur as indicated by the unbalanced equation?
A.
There are more substances on the right side of the equation than on the left side.
B.
There is a gas on the right side of the equation but not on the left side.
C.
The bromine atoms must go through a liquid state before becoming a gas.
D.
There is more mass represented on the right side of the equation than on the left side.
E.
The bromine atoms on the right side of the equation are not bonded to another element.
1. I think its B but im not sure imma check again
2. Its D fo sho
One
Let's start by stating what we know is wrong. Equilibrium is achieved when the reactants and products have a stable concentration. That makes D incorrect. Equilibrium is not established until about the 6th or 7th second.
The fact that you get any products at all means that the reactants will become products. Just who is favored has to be looked at very carefully. The products start very near 0. They go up until their concentration at equilibrium. When the reach equilibrium, the products have increased to 17. The reactants have dropped from 40 to 27. By a narrow margin, I would say the products are favored.
C is incorrect. There are still reactants left.
E is incorrect. the reactants started out with a concentration of 40. The reaction is not instantaneous. The concentration was highest at 40 or right at the beginning. This assumes that the reactants were mixed and the products were produced and the water/liquid amount has not changed.
B is incorrect. The concentration of the reactants is higher at equilibrium.
A is wrong. It is product favored.
I'm getting none of the above.
Problem Two
AgBr is insoluble (very). You'd have to work very hard to get them to separate into their elemental form. Just putting AgBr in water isn't enough. Lots of heat and lots of electricity are needed to get the elemental form.
I suppose you should pick B. Mass must be preserved. But if you balanced the equation, it would work with heat and electricity.
How does density determine whether an object will float?
Answer:
if the object is denser then the substance, it will sink, the less dense the object is then it will float
Explanation:
i got it right in my test. :) have a good day
Because of surface tension, a liquid _____.
resists flowing
forms droplets
forms a crystalline solid
takes the shape of its container
Answer:
The correct answer is forms droplets
1.2 L sample of gas is determined to contain 0.5 moles of nitrogen. At the same temperature and pressure, how many moles of gas would there be in a 20 L sample?
A 20 L sample of the gas contains 8.3 mol N₂.
According to Avogadro’s Law, if p and T are constant
V₂/V₁ = n₂/n₁
n₂ = n₁ × V₂/V₁
___________
n₁ = 0.5 mol; V₁ = 1.2 L
n₂ = ?; V₂ = 20 L
∴n₂ = 0.5 mol × (20 L/1.2 L) = 8.3 mol
Please help me, will mark brain whoever answers the fastest!
Page 1
1: The grass
2: The grasshopper
3: The frog
4: The snake
5: The eagle
Page: 2
The answer is the 2nd one
Page: 3
The owl would because its at the end it would have almost no more sun energy left in whatever it eats.
Hope This Helps :)
Grass, Grass Hopper, Frog, Snake, then Hawk.
For the food web question, it would be the third option because most organisms eat more than one thing.
The original source of energy in most ecosystems is the sun.
The owl would receive the least amount of energy because each level of the food chain only gains 10% of the organisms energy.
The measure of how closely a set of measurements are to each other is the best definition for which of the following terms. a error b uncertainty c accuracy d precision
Final answer:
Precision is the term that describes how closely a set of measurements are to each other, indicating the reproducibility of the measures under similar conditions. It differs from accuracy, which measures how close a measurement is to the true value. So the correct option is d.
Explanation:
The measure of how closely a set of measurements are to each other is best defined by the term precision. Precision refers to the reproducibility of measured values when repeated under similar conditions and indicates how close the measurements are to each other. It's important to note that precision is different from accuracy, which is a measure of how close a single measurement is to the correct or true value. Conversely, uncertainty is related to the potential variation in the measurements from the true value, providing an estimate of the range within which the true value lies.
which choices are correct based on the images provided
What causes atoms to form covalent bonds?each atom and the shared electronsthe nuclei of the two atomsthe valence electrons of the two atomsenergy levelsprotons and neutronsvalence electrons
In a covalent bond, two atoms are held together by the attraction between each atom and the shared electrons. the number of covalent bonds that an atom can form depends on the number of valence electrons in the atom.
hope dis helped u daddy
Answer: each atom and the shared electrons,
valence electrons
Explanation: A covalent compound is defined as the compound which is formed from the sharing of electrons between the element that are combining together.
These compounds are most likely to be formed when two non-metals combine together. For Examples: [tex]F_2[/tex]
Flourine is an element with tomic number 9 and has 7 valence electrons
[tex]F:9:1s^22s^22p^5[/tex]
Thus for formation of a [tex]F_2[/tex] molecule, they share their valence electrons and attain stable configuration.
Which hydrocarbon is an unsaturated hydrocarbon?
A.
2-methylheptane
B.
3-ethylpentane
C.
1-hexene
D.
cyclopentane
[tex]\boxed{\text{C. 1-hexene}}[/tex] is an unsaturated hydrocarbon.
Further Explanation:
Hydrocarbons:
The organic compounds consisting of hydrogen and carbon atoms alone are called hydrocarbons. Such compounds can be aromatic, aliphatic, linear, branched or cyclic. Aromatic hydrocarbons, alkanes, cycloalkanes are different types of hydrocarbons.
Types of hydrocarbons:
(I) Saturated hydrocarbons
These are variety of hydrocarbons that contain only single bonds in them and are the simplest hydrocarbons. Saturated hydrocarbons have the general formula of [tex]\text{C}_{\text{n}}\text{H}_{\text{2n+2}}[/tex] in which n indicates the number of carbon atoms present in it. Examples of saturated hydrocarbons are methane, ethane, butane and propane.
(II) Unsaturated hydrocarbons
The type of hydrocarbons that has multiple bonds in them are known as unsaturated hydrocarbons. Multiple bonds can be either double or triple bonds. Alkenes are those unsaturated hydrocarbons consisting of double bonds in them. For example, ethene, propene, and pentene are alkenes. Alkynes refer to unsaturated hydrocarbons with triple bonds in them. Ethyne and propyne are examples of alkynes. Alkenes are represented by general formula, [tex]\text{C}_{\text{n}}\text{H}_{\text{2n}}[/tex] while alkynes are represented by general formula of [tex]\text{C}_{\text{n}}\text{H}_{\text{2n-2}}[/tex] .
Alkanes use ‘ane’ as suffix in their naming. Alkenes use ‘ene’ as suffix while ‘yne’ is used in naming of alkynes.
Since 2-methylheptane, 3-ethylpentane and cyclopentane have suffix ‘ane’ in their names and are tered as saturated class of hydrocarbons called alkanes. But 1-hexene has suffix ‘ene’, indicating that it belongs to unsaturated hydrocarbons called alkenes. Therefore 1-hexene is an unsaturated hydrocarbon.
Learn more:
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2. Write the name of the hydrocarbon: https://brainly.com/question/3551546
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Hydrocarbons
Keywords: hydrocarbons, saturated, unsaturated, alkene, alkyne, CnH2n+2, CnH2n, CnH2n-2, double bonds, triple bonds, single bonds, 1-hexene, cyclopentane, 2-methylheptane, 3-ethylpentane.
The compound which is an unsaturated hydrocarbon is 1-hexene.The correct option is C.
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.
Organic compounds have single,double or triple bonds due to which the single organic compounds are saturated while the other two are unsaturated hydrocarbons with suffix '-ene' or '-yne'.
Thus, the correct option is C.
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As a skateboarder moves down hill some of the energy is
What two things must you specify when describing the velocity of an object
When describing the velocity of an object, you must specify the both the speed and the direction.
That’s because velocity is a vector: it has both magnitude (speed) and direction.
If you say that a object is travelling southwest at 70 km/s, you are giving its velocity.
If you say that it is travelling at 70 km/s, you are giving its speed.
Final answer:
To describe the velocity of an object, you must specify the magnitude of speed and its direction, reflecting that velocity is a vector quantity unlike speed, which is scalar.
Explanation:
To describe the velocity of an object, one must specify two key things: (1) the magnitude of the speed, which is a scalar quantity representing how fast the object is moving, and (2) the direction of travel, which informs us of the orientation of the object's motion in space. For example, an object moving at 20 meters per second towards the north has a velocity that can be expressed as '20 m/s north'. This descriptive pairing of speed and direction is what differentiates velocity from speed, making velocity a vector quantity.
When illustrating velocity, a vector representation is often used, which is not always to scale but indicates direction and relative magnitude. For instance, in the case of the two airplanes with different speeds and directions discussed in the question, their velocities can be represented by arrows with lengths proportional to their speeds and pointing in the respective directions of travel - northeast and southwest.
Which chemical equation represents a precipitation reaction?
A.
Mg(ClO3)2(aq) + 2HCl(aq) → MgCl2(aq) + 2HClO3(aq)
B.
AlBr3(aq) + 3LiI(aq) → AlI3(aq) + 3LiBr(aq)
C.
NH4NO3(aq) + HBr(aq) → NH4Br(aq) + HNO3(aq)
D.
Li2CO3(aq) + FeCl2(aq) → 2LiCl(aq) + FeCO3(s)
Answer:- D. [tex]Li_2CO_3(aq)+FeCl_2(aq)\rightarrow 2LiCl(aq)+FeCO_3(s)[/tex]
Explanations:- In chemical equations, (aq) stands for aqueous, (l) stands for liquid, (g) stands for gas and (s) stands for solid. In double replacement reactions, (aq) means soluble and (s) means insoluble that is precipitate.
Looking at all the equations, it is only the last equation that has a solid product and so this is the only precipitation reaction. A precipitate for Iron(II)carbonate is formed in it.
Answer:
The correct answer is
D. Li2CO3(aq) + FeCl2(aq) → 2LiCl(aq) + FeCO3(s)
What do elements in the first two columns of the periodic table have in common
All of them are very reactive.
list 3 common house hold items and 2 physical properties for each
physical properties for a bar of soap: hardness and color
physical properties for a book: texture and size
physical properties for tooth past: cohesiveness and taste
Answer: The correct answer is:
1. Metal pot: Hardness, fusibility
2. Glass cup: Transparent, resistant
3. Sheet of paper: White, porous
Explanation:
A physical property is one that is based primarily on the structure of the object, substance or matter, which is visible and measurable.
We can define the physical properties of an object through observation and measurement. For example, the physical properties of a wooden cube would be: dense, solid, square, wooden, organic, non-malleable, etc.
can u give me uses of sodium
Ok. Sodium is used in the everyday things we eat or known as naCI. It is also used a reactor for nuclear things. It is also added to snow to de-ice the roads in winter.
A cookie recipe calls for 1 pound of butter. How many grams of butter would be needed for 3 batches
Answer: 1,360.776 grams
Explanation: given that a recipe/batch
requires 1 pound of butter
3 pounds would require x
Crosss multiplying we have
X=3 pounds
Converting pound to grams
1 pound =453.592grams
3pound =x grams
Xgrams =453.592*3
X=1,360.776 grams
Which pair of groups will have larger ionic radii compared to their atomic radii after gaining electrons? A Chalcogens and Alkaline Earth Metals B Halogens and Alkali Metals C Alkali and Alkaline Earth Metals D Transition and inner-transition metals E Chalcogens and Halogens
how many atoms of chromium are in 0.86 mol of potassium chromate (K2CrO4)?
Atoms of Cr in 0.86 mol of K2CrO4 = 0.86 × 6.02*10^23 = 5.177 * 10^23 atoms.
Explanation:One mol of K2CrO4 contains 6.02*10^23 molecules of K2CrO4.One K2CrO4 contains 1 atom of Cr.So 0.86 mol of K2CrO4 contain 0.86 * 6.02*10^23.Which is equal to 5.177 * 10^23 atoms.To find the number of atoms of chromium in 0.86 mol of potassium chromate, you multiply the moles by Avogadro's number, resulting in approximately 5.18 x 10²³ Cr atoms.
To calculate how many atoms of chromium are in 0.86 mol of potassium chromate (K₂CrO₄), we have to understand the composition of the compound potassium chromate. Potassium chromate consists of two potassium (K) ions, one chromium (Cr) atom, and four oxygen (O) atoms. Since there is one Cr atom in each formula unit of K₂CrO₄, the number of Cr atoms will be equal to the number of moles of K₂CrO₄ given.
To find the number of Cr atoms, we use Avogadro's number, which states there are approximately 6.022 x 10²³atoms in one mole of any substance. Therefore, we calculate the number of atoms of chromium by multiplying the number of moles of K₂CrO₄ by Avogadro's number:
Number of molecules = Number of moles × Avogadro’s number
Number of molecules = 0.86moles×(6.022 × 10²³ molecules/mol)
Number of molecules ≈ 5.18 × 10²³ molecules
Natalie observes these characteristics in the model of an atom. (i) includes positive charge (ii) contains electrons (iii) explains the photoelectric effect (iv) suggests the probable location of electrons Which model is Natalie most likely examining? Bohr model Dalton’s model plum pudding model electron-cloud model
Electron cloud model
Answer:
Electron cloud model
Explanation:
on edge
2h20 The underlined portion of the chemical formula above represents the _____, which tells _____________________.
Answer : A chemical formula usually represents the chemical species involved in a chemical reaction. It gives a clear information about the chemical proportions of atoms present in an chemical compound.
This chemical formula usually employs the use of chemical element symbols, numbers, etc.
Also, sometimes other symbols are also used like parentheses, dashes, brackets, commas and plus (+) or minus (−) signs.
In the given question [tex]2H_{2}O[/tex] where 2 represents the number of hydrogen atoms present in that chemical species (water molecule), The number of oxygen atom is one because it doesn't has any number before it.
The subscript [tex]H_{2}[/tex] represents the valency of hydrogen, which is 2 here. In all if we have to calculate the total number of hydrogen in this water molecule which is 4 because 2 X 2=4; this is because 2 hydrogen is multiplied with 2 valency of hydrogen.
The answer is:
Coefficient; how many water molecules there are.
Drag the tiles to the correct boxes to complete the pairs. Match each type of model to the corresponding example.
conceptual model
pairs:
physical model
virtual model
mathematical model
pair with:
an equation that shows how an object’s acceleration relates to its mass
several balls and sticks glued together to represent a molecule
a computer program that shows all possible planetary orbits
a diagram that shows the shape of the magnetic field around an object
Answer:
Conceptual model - a diagram that shows the shape of the magnetic field around an object
Physical model - several balls and sticks glued together to represent a molecule
Virtual model - a computer program that shows all possible planetary orbits
Mathematical model - an equation that shows how an object’s acceleration relates to its mass
Explanation:
happy to help :^)
The correct pairings of conceptual models with their corresponding examples:
Physical model: several balls and sticks glued together to represent a molecule.Virtual model: a computer program that shows all possible planetary orbits.Mathematical model: an equation that shows how an object’s acceleration relates to its mass.Conceptual model: a diagram that shows the shape of the magnetic field around an object.What is the modelA physical model is a copy or imitation of something that helps us see and understand its features, how it behaves, or its design. Physical models are objects that you can touch and are in three dimensions. They can be similar to a smaller version of a building or simple objects like balls and sticks that represent molecules.
A virtual or computer-made picture of something that you can use to study and interact with. Virtual models are frequently used in simulations and computer programs to imitate real-life events or situations. An example is a computer program that displays how planets move in their paths around the sun.
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How are elements organized in the periodic table
the high temperatures on venus are caused by the _______.
As sunlight heats Venus' surface, the surface radiates infrared energy that is kept from escaping the planet by dense carbon dioxide atmosphere. This is called the greenhouse effect.
The High tempatures on Venus are caused by the Greenhouse effect
Complete and balance each of the following equations for gas evolution reactions. (Express your answer as a chemical equation. Identify all of the phases in your answer) HClO4(aq)+K2CO3(aq)—->
Please help! And with parts B and C.
1) Balanced chemical reaction:
2HClO₄(aq) + K₂CO₃(aq) → K₂CO₃(aq) + CO₂(g) + H₂O(l).
2) Balanced chemical reaction:
HC₂H₃O₂(aq) + LiHSO₃(aq) → LiC₂H₃O₂(aq) (aq) + SO₂(g) + H₂O(l).
3) Balanced chemical reaction:
(NH₄)₂SO₄(aq) + Ca(OH)₂(aq) → CaSO₄(s) + 2NH₃(g) + 2H₂O(l).
CaSO₄ (calcium sulfate) is insoluble in water.
1) Aqueous perchloric acid reacts with aqueous potassium carbonate to form aqueous potassium perchlorate, carbon dioxide gas and water.
2HClO₄(aq) + K₂CO₃(aq) → 2KClO₄(aq) + CO₂(g) + H₂O(l).
2) Aqueous acetic acid reacts with aqueous lithium bisulfite to form aqueous lithium acetate, sulfur dioxide gas and water.
HC₂H₃O₂(aq) + LiHSO₃(aq) → LiC₂H₃O₂(aq) + SO₂(g) + H₂O(l).
3) Aqueous ammonium sulfate reacts with aqueous calcium hydroxide to form a white precipitate of calcium sulfate, ammonia gas and water.
(NH₄)₂SO₄(aq) + Ca(OH)₂(aq) → CaSO₄(s) + 2NH₃(g) + 2H₂O(l).
A certain food web is made up of crabs, lobsters, seaweeds, and sea gulls. Which organism is most likely the producer in this food web?
The seaweed would be the producer in this exact food web.
Since the seaweed is the main source of food in that food web, it supplies everything else in the food web by supplying the animal that eats it, which supplies the animal that eats that animal, and so on.
Confusing, right?
Have a great day :)
Answer: seaweed
Explanation:
it’s the only plant in this food web
What is the pH of a 0.65 M solution of pyridine, C5H5N?
Hey there!
The pH of a weak base (in this case, pyridine is a weak base) is calculated by using the weak base equation, and then solving it.
C5H5N; Kb= 1.7 x 10⁻⁹
pH = -log [H⁺]
we can also say that pH = 14 + log [OH⁻]
Plugging into the weak base equation, we know that Kb = [OH⁻][BH⁺] / [B]
This can be solved using an ice chart, which will then simplify to :
Kb = [x][x] / [0.50-x]
We can assume that x is very small in comparison to the 0.5 , so we consider it zero.
Then plug in and solve for x. 1.79 *10-9 = x² / 0.5
x = 2.992 * 10⁻⁵
ince X is equal to the [OH⁻] concentration, we can plug it into the second pH equation, and get the pH!
pH = 14+ log 2.99 * 10⁻⁵
pH = 9.48
Hope that helps!
The pH of a 0.65 M solution of pyridine (C₅H₅N) is 9.52.
The equation for the protonation of the base pyridine is the following:
C₅H₅N + H₂O ⇄ C₅H₅NH⁺ + OH⁻ (1)
The constant of the above reaction is:
[tex] K_{b} = \frac{[C_{5}H_{5}NH^{+}][OH^{-}]}{[C_{5}H_{5}N]} = 1.7 \cdot 10^{-9} [/tex] (2)
To calculate the pH of the solution we need to use the following equation:
[tex] pH + pOH = 14 [/tex]
[tex] pH = 14 - pOH = 14 - (-log[OH^{-}]) = 14 + log[OH^{-}] [/tex] (3)
So, we need to find the concentration of the OH⁻ ions. Since pyridine is a weak base, at the equilibrium we have (eq 1):
C₅H₅N + H₂O ⇄ C₅H₅NH⁺ + OH⁻
0.65 - x x x
After entering the values of [C₅H₅N] = 0.65-x, [C₅H₅NH⁺] = x, and [OH⁻] = x, into equation (2) we can find the concentration of OH⁻:
[tex] 1.7 \cdot 10^{-9} = \frac{[C_{5}H_{5}NH^{+}][OH^{-}]}{[C_{5}H_{5}N]} = \frac{x*x}{0.65 - x} [/tex]
[tex] 1.7 \cdot 10^{-9}(0.65 - x) - x^{2} = 0 [/tex]
Solving the above quadratic equation for x, we have:
[tex] x_{1} = -3.32 \cdot 10^{-5} M [/tex]
[tex] x_{2} = 3.32 \cdot 10^{-5} M [/tex]
We can calculate the pH, after taking the positive value, x₂, (concentrations cannot be negative) and entering into equation (3):
[tex] pH = 14 + log[OH^{-}] = 14 + log(3.32 \cdot 10^{-5}) = 9.52 [/tex]
Therefore, the pH of the solution of pyridine is 9.52.
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which can be classified as a trace fossil
a.dinosaur bone
b.shrimp burrow
c.imprint of a fern leaf
d.mold of a clam shell
Trace fossils provide us with indirect evidence of life in the past, such as the footprints, tracks, burrows, borings, and feces left behind by animals, rather than the preserved remains of the body of the actual animal itself. so i would say B.
The option that can be classified as a trace fossil is b.shrimp burrow
What is Trace fossils ?A trace fossil is a fossil that contains traces of ancient plants or animals such as footprints, nests, burrows, or excrement in an indirect, visible manner. Ichnology is the field of study of trace fossils.
Body fossils and trace fossils are frequently discovered together in the same area. Instead of the preserved remnants of the actual animal's body, trace fossils offer us indirect proof of life in the past in the form of animal footprints, tracks, burrows, borings, and feces.
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identify if its noble gass or longhand
Iron (Fe): [Ar]4s23d6
i will say ar that all i got
NOBLE GAS IS THE ANSWER