Answers
Answer:
answer is #4
Explanation:
Zn^0 -------> Zn^2+ ,
H^1+ --------> H^0
Related Questions
Use the following equation to answer the questions below.
CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g)
1. What type of reaction is this? Why do you say it is this type of reaction? Support your claim with evidence. (2 points, 1 point valid type of reaction, 1 point valid evidence)
2. What is the mole ratio of methane to water in the reaction? (1 point correct mole ratio)
3. How many moles of water are produced from the reaction of 50.0g of methane (CH4)? Show your work (2 points, 1 point valid answer, 1 point valid work)
Answers
Answer:
1-Double replacement
Explanation:
A student has a cube with each side is 4 cm in length, what is the volume? What is the measurement unit? Select ALL that apply.
Answers
Answer:
64cm^3
Explanation:
To get the volume just multiple 4*4*4
Which elements are;
a)solids,
b)liquids
c)gases
at 25°C
Answers
There is 1.00 × 102 mg of caffeine in a shot of espresso. The chemical formula of caffeine is C8H10N4O2. Determine the moles of carbon and hydrogen present in the caffeine in one shot of espresso
Answers
Answer:
In one shot of expresso, there are:
4.12 x 10^-3 moles of C atoms
5.15 x 10^-3 moles of H atoms
2.06 x 10^-3 moles of N atoms
1.03 x 10^-3 moles of O atoms
The moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
What is mole?A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
6.02 x 1023 chemistry instructors make up a mole. Anytime we want to make a reference to a lot of different things, it is much simpler to type the word "mole" rather than the number "6.02x1023." In essence, it is the reason this specific unit was created.
caffeine in a shot of espresso = 1.00 × 10² mg/1000=0.1g
mole of caffeine =0.1g÷ 194.19g/mol
=5.149× 10⁻⁴mole
moles of carbon =8×5.149× 10⁻⁴
= 4.11× 10⁻³moles
moles of carbon = 10× 5.149× 10⁻⁴
=5.14× 10⁻³moles
Therefore, the moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
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A sample of gas at 3000.0mmHg inside a steel tank is cooled from 500.0°C to 0.00°C what is the final pressure of the gas in the steel tank
Answers
Answer:
1429.32 mmHg
Explanation:
Initial Pressure P1 = 3000.0mmHg
Initial Temperature T1 = 500.0°C + 273 = 573 K ( Converting to kelvin temperature)
Final Temperature T2 = 0.00°C + 273 = 273 K ( Converting to kelvin temperature)
Final Pressure P2 = ?
The pressure of a given amount of gas is directly proportional to the absolute temperature provided volume remains constant.
This is given by the mathematical expression;
P1 / T1 = P2 / T2
Inserting the values;
3000 / 573 = P2 / 273
P2 = 273 * 3000 / 573
P2 = 1429.32 mmHg
When a gas is heated, the gas particles have more kinetic energy. Complete the following sentence: This means they move about more and have more ______ with the sides of the container. This increases the pressure.
Answers
Answer:
Contact
Explanation:
As the speed of the particles increases, they move around more, which means they hit the sides of the container more.
20 Points!!
Need it as soon as possible.
Answers
Answer:
D.
Explanation:
The reaction is losing potential energy, which means that the reaction is losing that energy as heat. Exothermic is the loss of energy. Therefore it will be D.
energy is being released in that.
What affects both deep water and surface currents in the ocean?
Answers
Answer:
These currents are on the ocean's surface and in its depths, flowing both locally and globally. Winds, water density, and tides all drive ocean currents. Coastal and sea floor features influence their location, direction, and speed. Earth's rotation results in the Coriolis effect which also influences ocean currents. -
Answer: The Coriolis effect
Explanation:
1.25 x 1025 molecules of glucose (C H202) is
how many moles of glucose?
Answers
Answer:
1281.25 Moles of glucose
Explanation:
Multiply 1.25x1025= 1281.25
Explain how the use of fossil fuels can cause lakes and ponds to become more acidic.
Answers
Answer:
Explained below
Explanation:
Fossil fuels which are made up of coal and oil when burnt by power-production industries, make sulfur to be released into the atmosphere where it combines with oxygen to form SO2 (sulfur Dioxide). Now, the exhausts possessed by cars could also cause the formation of nitrogen oxides in the atmosphere. Therefore, H2SO4 which is airborne sulfuric acid and HNO3 which is nitric acid can be formed and when dissolved in the water vapor in the atmosphere form what is called acid rain.
Now, as acid rain flows through the soil, it can leach aluminum from the soil clay particles and then flow into the lakes to make them more acidic.
Why is there a difference in the heating rates of land and water?
Answers
1. Which of the following statements is true about seeds?
a. Every plant produces seeds.
c. All seeds are good to eat.
b. All fruits contain many of seeds. d. all seeds has young plant, stored food and a seed coat.
2. Flowers cannot usually produce seeds unless
a. they are visited by insects.
c. they produce nectar.
b. they are on plants growing in good soil. d. the right pollen is placed on their stigmas.
3. Fertilization take place before a seed develops. Which statement describes when fertilization
occurs?
a pollen grain falls on a pistil
c. sperm in a pollen joins with an egg cell in an ovule
b. a pollen tube enters an ovary
d. an ovary becomes a fruit
4. Which of the following is NOT a factor needed by plants?
a. fire
b. nutrients
Please pasagot po ng tanong ko please
c. sunlight
d. water
5. Which is the reproduction in plants where the male and female parts of the flower are involved?
a. asexual
b. sexual
c. rhizome
d. pollination
Answers
Answer:
1 ans: d. all seeds has young plant, stored food and a seed coat.
2 ans: d. the right pollen is placed on their stigmas
3 ans: a. pollen grain falls on a pistil
4 ans: a. fire
5 ans: b. sexual
Hope it helps,
Please mark me as brainliest
Thank you...
20 points to whoever can answer these 3 questions correctly
Answers
Answer:
1.true
2.2
3. false
Explanation:
.........
how electronegativity relates to polar bonding
Answers
How many moles are in 4.0 x 1023 atoms of iron?
Answers
Answer:
4092 atoms of iron i am guessing
Explanation:
Label each process as a physical or chemical change and state how you know.
fogging a mirror with your breath
breaking a bone
mending a broken bone
burning paper
slicing potatoes for fries
mixing sugar with coffee
frying chicken
a nail rusting
paper ripping
wood burning
mixing water and food coloring
food molding (rotting)
writing on paper
dyeing fabric
Answers
Fogging a mirror with your breath is a physical change because it involves a phase change of water vapor condensing and adsorbing to the mirror surface. Phase changes are physical changes.
Breaking a bone is a physical change insofar as we're focusing on the "breaking" part.
Mending a broken bone, however, is a different story. Bones are living things: They consist of tissues that in turn consist of cells. The actual mending process involves some very complicated biochemistry. Suffice it to say that mending a broken bone would be a chemical change.
Burning paper is a chemical change. Burning anything implies combustion, which is a chemical reaction where some fuel is oxidized (usually by oxygen gas, producing carbon dioxide gas and water vapor).
Slicing potatoes for fries is a physical change. You can slice, dice, smash, mash, stretch, bend, compress, or grind a potato: What you will have is still a potato (okay, there are some chemical changes going on as you're rupturing cells in the process, causing them to release their contents which may participate in chemical reactions). But the key, again, is that cutting up some material doesn't fundamentally change the chemical identity of that material.
Mixing sugar with coffee actually involves two physical processes: the mixing and the (presumed) solvation of the solid sugar particles as they dissolve into the coffee. In either case, either mixing or dissolving would be a physical change. The sugar molecules are still in the coffee and are chemically unchanged.
Frying chicken is a chemical change. In fact, frying chicken likely entails several different types of chemical changes. The common thread among them is that frying involves breaking chemical bonds in and on the chicken by the addition of thermal energy, and new chemical bonds end up being formed. That's the hallmark of a chemical change.
A nail rusting is a chemical change. Rusting is an electrochemical process; the familiar corrosion of iron into rust is, at bottom, a chemical reaction where iron reacts with oxygen to form iron oxides (often catalyzed by the presence of water and salts).
A paper ripping is analogous to slicing potatoes: it's a physical change. If you ripped one sheet of paper into two halves, each half would retain all the chemical properties of the original sheet.
Likewise, wood burning is analogous to burning paper, and as such is a chemical change. Again, combustion is a chemical process.
As we said earlier with sugar in coffee, mixing in itself is a physical process. While it may seem like you've permanently changed the nature of the water by dyeing it with food coloring, the molecules comprising the food coloring are simply dispersed within the vast sea of water molecules. There are no intramolecular bonds that are broken or formed; the chemical identities of all the substances here are preserved. So, this is a physical change.
Food molding (rotting) is a chemical change. Rotting is biochemical decomposition: the chemical bonds that make up the food are broken down by enzymes released by the mold.
Writing on paper, whether it be with a pen, pencil, crayon, or marker, is a physical change. The molecules from the writing instrument are physically stuck to the paper. But unless you're writing on paper by, say, burning letters onto it, there are no chemical changes occurring when the writing instrument meets the paper.
As with writing on paper, dyeing fabric can be a physical change. The dye consists of molecules that interact with light in a way that we perceive a certain color. When dyeing fabric, these molecules are transferred and fixed into the fabric by adsorption, absorption, and other intermolecular phenomena. But the molecules of the dye (and the molecules in the fabric) don't experience any breaking and forming of bonds. All of the substances involved retain their chemical identities.
However, it's possible that, depending on the dye, there may be chemical changes involved. Some dyes, appropriate named "reactive dyes," undergo chemical reactions with their substrate (which, in this case, would be the fabric), or dyes may be used that undergo chemical reactions with one another, both of which would constitute chemical changes. And it can depend on what you mean by "dyeing": Bleaching a colored shirt can technically be conceived of as "dyeing" the shirt white, and this process involves cleavage of bonds within the color-producing molecules in the fabric by reacting with the molecules in the bleach.
So, for dyeing fabric, it can be a physical or chemical change depending on the dye.
which of the following best explains why the strings of a harp make sounds when it is played?
Answers
Need help answering these questions. Please show all work. Thank you so much.
Answers
Answer:
i dont know
Explanation:
An atom that has lost one or more electrons is a(n) _____.
Not Cation
Answers
Answer:
ion
Explanation:
that is the definition according to g o o g l e:
"an atom or molecule with a net electric charge due to the loss or gain of one or more electrons."
Answer:
An ION
Explanation:
Because a positive ion is called a CATION and a negative ion is called an ANION (Please brainlist me)
State the 2 products formed when a metal reacts with water
Answers
Answer:
hydroxide and hydrogen
Explanation:
When a metal reacts with water, a metal hydroxide and hydrogen are formed. Sodium reacts vigorously with water.
Answer: Hydrogen Gas ( H2)
Explanation: When metals react with water they form hydrogen gas which actually react and start to burn and make squeaky pop noises.
Which coefficient placed before HCl will balance the following
equation? Zn+HCI ZnCl2 + H2
Answers
Explanation:
Given chemical equation
Zn + HCL ➡ ZnCl2 + H2
Now balancing
Zn + 2HCL ➡ ZnCl2 + H2
Hope it will help :)❤
The coefficient placed before HCl which makes the equation to be balanced is 2.
To know which coefficient will be placed before HCl to balance the equation, we shall simply balance the equation given from the question.
Zn + HCl —> ZnCl₂ + H₂
The above equation can be balance as illustrated below:
There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before HCl as shown below:
Zn + 2HCl —> ZnCl₂ + H₂
Now, the equation is balanced.
From the balanced equation above, the coefficient written before HCl which makes the equation to be balance is 2.
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(a) Give the H-C-O bond angle in methyl formate H-C-O bond angle methyl formate
(b) One dihedral angle in methyl formate relates the plane containing the O-C- O bonds to the plane y two structures of methyl formate: one in which this dihedral angle containing the Co-onds, identand the other in which it is 180 0° dihedral angle 80" dihedral angle.
Answers
Answer:
Explanation:
The bond angle is said to be the angle between two atoms near or around the same atom for a given covalent compound. However, a dihedral angle is known as the angle formed between two planes. Bond angles are usually planar while dihedral angles are interplanar.
The diagram below shows the structure of each compound.
Select the correct answer.
The elements beryllium, calcium, and strontium are all in group 2. What is the correct relationship of these elements regarding their ionization energy?
A.
Ca < Be < Sr
B.
Sr < Be < Ca
C.
Be < Ca < Sr
D.
Sr < Ca < Be
E.
Ca < Sr < Be
Answers
Answer:
d. The correct answer for your questions is Sr<Ca<Be
Answer:
Answer:- choice d is correct. Sr<Ca<Be .
Explanations:- Br, Ca, and Sr are all elements of same group as they all have 2 valence electrons. As we move down in a group, a new shell is being added that increases the size of the atom. As the size of an atom increases, it is easy to remove the electron from it's outer most shell in it's gaseous state. Since, Be is above Ca and Ca is above Sr. The size increases in the order, Be < Ca < Sr. It means Be is the smallest one of them and so it's hard to remove from it's outer most shell and hence it's ionization energy is higher.
Sr is largest one in these three elements and so it's easy to remove outer most electron from it that means the ionization energy is least. Ca is between Be and Sr.
So, an increasing order of ionization energy is Sr<Ca<Be . Choice D is correct.
The empirical formulae of a compound is CH2O. The relative formula mass for the molecular formula is 180. What is the molecular formula?
Answers
Answer:
ch20 is the empirical formula for glucose , c6h1206 is the molecular formula .
need asap!
The boiling point of hydrogen sulfide is low. Explain why.
Answers
Sulfur is not nearly as electronegative as oxygen so that hydrogen sulfide is not nearly as polar as water. Because of this, comparatively weak intermolecular forces exist for H2S and the melting and boiling points are much lower than they are in water.
The boiling point of hydrogen sulfide is low because the oxygen atom was stronger electronegative than that of the Sulphur atom, water would be more polar than hydrogen sulphide.
What is polar molecule?If a molecule does have more positive charges on one end than negative charges on the other, an electrical pole has been created. This is how polar molecules are typically formed.
What is boiling point?
The temperature where a liquid's vapor pressure reaches the pressure around it as well as the liquid transforms into a vapor is known as the boiling point of a substance.
The boiling point of hydrogen sulfide is low because the oxygen atom was stronger electronegative than that of the Sulphur atom, water would be more polar than hydrogen sulphide. Additionally, hydrogen sulphide has a lesser melting point as well as boiling point than water due to poor intermolecular forces (dipole forces, Vander Waal's forces).
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24. In our experiment, we filled 4 tubes with water and bromothymol blue.
Tube 1 did not contain an organisms, tube 2 contained a snail, tube 3
contained a elodea and tube 4 contained both a snail and elodea. What
tubes could photosynthesis occur in?
O Tubes 3 and 4
O Tubes 2 and 4
O Tubes 2, 3, and 4
Answers
Answer:
C. Tubes 2, 3, and 4
Explanation:
Tube one doesn't contain an organism so it can't be that one.
Both a snail and an elodea are considered an organism, cellular respiration occurs in almost any organism's cells.
good luck, i hope this helps :)
What’s the answer for this question
Answers
Answer:
i think it's B
Explanation:
PLEASE HELP ASAP
Aluminum oxide (Al2O3) and iron (Fe) react according to the following
balanced equation:
4Al2O3 + 9Fe + 3Fe304 + 8A|
If there are 10.2 grams of Al2O3 and 11.2 grams of Fe, which statement
identifies the limiting reagent in this reaction and best supports that claim?
Answers
Answer:
Fe is the limiting reagent
Explanation:
In a chemical reaction, the limiting reactant, also known as the limiting reagent. Therefore, the correct option is option C.
What is limiting reagent?In a chemical reaction, the limiting reactant, also known as the limiting reagent, controls how much product is produced. Calculating the percentage value of a reaction is achievable if the limiting reactant has been identified.
Because elements and compounds in an equilibrium chemical equation react in accordance with their mole ratios, there must be a limiting reactant. Therefore, when one of the reactants was present in a larger amount than the other and the mole ratio inside the balanced equation specifies that it takes 1 mole from each reactant to generate a product, the reactant existing in the lesser amount would be the limiting reactant.
4Al[tex]_2[/tex]O[tex]_3[/tex] + 9Fe [tex]\rightarrow[/tex] 3Fe[tex]_3[/tex]O[tex]_4[/tex] + 8A|
moles of Al[tex]_2[/tex]O[tex]_3[/tex] = 10.2 /101.96
=0.10moles
moles of Fe = 11.2/55.8
=0.20
Fe is the limiting reagent
Therefore, the correct option is option C.
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Identify the reaction that would possibly make a good
airbag inflator.
a. Fe (s) + S (s) - Fes (s)
b.CH, (g) + 20 (g) - CO, (g) + 2H,0 (
c. Cao (s) + H20 (1) - Ca(OH), (s)
d. 2KCIO, (s) - 2KCl(s) + 30 (9)
Answers
Answer:
D
Explanation:
Cuz i got it wrong and this was the right answer : )
The best reaction that would possibly make a good airbag inflator is the reaction in which CO2 is produced.
An airbag refers to certain objects that are put into vehicles to ensure that the occupants of the vehicle do not bump against objects that are within or outside the vehicle when there is a collision.
Since a good airbag must contain substances that quickly react to produce a non-combustible gas that fills up the airbag in order to cushion the effect of a collision, the best reaction that would possibly make a good airbag inflator is the reaction in which CO2 is produced.
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A prokaryotic cell does not have
А
a cell membrane.
B
genetic material.
C
a nucleus.
D
flagella.
Answers
Answer:
D
Explanation: