Answer
Explanation:
Magnesium Oxide has a formula of MgO.
Magnesium has a molar mass of 24.30g/mol and Oxygen has a molar mass of 15.99g/mol.
From this, we can say we are assuming a 1 mole sample of magnesium oxide, as the stoichiometric coefficients will always be the same, as will the ratio of oxygen to magnesium.
From this,
[tex]15.99g/mol *1 mol MgO = 15.99 gOxygen\\24.30g/mol *1molMgO=24.30gMagnesium\\Oxygen mass percent = 15.99/(15.99+24.30) = .396[/tex]
The Magnesium equation will be the same but a different numerator. Notice, if there were different coefficients on the elements, you would have to multiply by the stoich coefficient.
When phenol reacts with ammonia is presence of zncl_(2) at 300^.
Answer:
the answer isWhen phenol Is heated with ammonia the presence of anhydrous ZnCl_(2), it is converted into.Explanation:
i hope it's help
Why can a soil scientist be part of the agriculture?help ASAP I’ll give brainliest
Please help me. For these 2 pictures are they a chemical change or physical change please explain your reasoning for both diagrams. Thank you!
Answer:
the first is a physical change the second is a chemical change. in the first picture, the substance hasn't changed it has just been divided up. the second picture demonstrates a chemical change because the elements of the compound have been split up and rearranged into a chemically different substance.
Explanation:
Which of the following is an adaptation of organisms in avoiding unfavorable condition due to a change in abiotic factor?
A. Migration of birds due to change in seasons.
B. Hibernation of a snake from September to December.
C. Plants die due to lack of water and high temperature.
D. Body temperature regulation of polar bears during winter
Volcanic eruption is considered as one of the changes in abiotic factors in the ecosystem. Which of the following is/are the effect/s of volcanic eruptions in the ecosystem?
A. I and II only
B. I and III only
C. II and III only
D. I, II, and III
Help plsssssss
The effects of volcanic eruption include acid rain and destruction of lives and property.
What are abiotic factors?The term abiotic factors refers to those factors that are non living such as rainfall, topography, etc. The adaptation of organisms in avoiding unfavorable condition due to a change in abiotic factor is hibernation of a snake from September to December.
A volcanic eruption is a sudden outburst of molten magma from the earth's crust. The effects of volcanic eruption include acid rain and destruction of lives and property.
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Which elements make up a water molecule?
COSMO
hydrogen and nitrogen
oxygen and nitrogen
oxygen and carbon
hydrogen and oxygen
Answer:
hydrogen and oxygen make up water molecules
Answer:
Oxygen and Nitrogen
Explanation:
because these two elements react very strongly
Taylor grows corn on his farm. How does farming affect the amount of fresh water available?
Answer:
On average, agriculture accounts for 70 percent of global freshwater withdrawals. In the last 30 years, food production has increased by more than 100 percent. FAO estimates that about 60 percent more food will be needed by 2050 to meet the food requirements of a growing global population.
Explanation:
Because i learnt this before and i aced a test about it dont worry
The chemical symbol O=O means ________.
a. the atoms are double bonded
b. zero equals zeroc
c. both atoms are bonded and have zero electrons in the outer orbit
d. this is an ionic bond with two shared electrons
Considering the definition of covalent bond, the correct answer is option a. the chemical symbol O=O means the atoms are double bonded.
Definition of covalent bondThe chemical bond in which atoms share electrons to create molecules is known as a covalent bond and is established between non-metallic elements. These elements tend to gain electrons to acquire the stability of the electronic structure of noble gases and have a lot of valence electrons at their outermost level. The shared electron pair is common to the two atoms and holds them together.
Depending on the number of pairs of electrons shared between the atoms that form the bond, covalent bonds will be single, double, or triple. Two atoms form a single covalent bond when they share one pair of electrons, a double bond when they share two electron pairs, and a triple bond when they share three electron pairs.
Correct answerTaking into account the definition of covalent bond, the chemical symbol O=O means the atoms are double bonded (option a.)
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What do theories help scientists do? (1 point)
A. prove hypotheses to be correct
B. explain large collections of data
C. determine if a claim is false
D. propose new ideas on the subject
Answer:
A. prove hypotheses to be correct is the correct answer I think
Explanation:
A scientific theory has been defined as a thorough explanation of the facts and includes the hypothesis and laws. The scientific theory allows scientists to prove the hypothesis to be correct. Thus, option A is correct.
What are scientific theories?Scientific theories have been the summary of the universal and natural sciences that are well sustained and never proved. They are based on observable explanations and information that were tested through experimentation.
It uses experimental and research setup to prove the hypothesis to be credible by the conclusions and findings that are also supported by the scientific laws. They are reliable conclusions and are just not guesses.
Therefore, option A. scientific theories are used to prove the reliability of the hypothesis.
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Which term names the container that holds the gear box and generator in a wind power system?.
Answer:
Nacelle. The nacelle sits atop the tower and contains the gearbox, low- and high-speed shafts, generator, and brake.
Explanation:
What gives an atom mass?
a. protons & electrons in the cloud
b. protons & neutrons in the nucleus
c. protons & electrons in the nucleus
d. electrons in the cloud
How many molecules of oxygen are there in 1.00 dm3 of oxygen at standard pressure and a temperature of 273 K. Give your answer to three significant digits.
we need no of moles
[tex]\\ \tt\hookrightarrow PV=nRT[/tex]
[tex]\\ \tt\hookrightarrow n=\dfrac{PV}{RT}[/tex]
[tex]\\ \tt\hookrightarrow n=\dfrac{1}{273(8.314)}[/tex]
[tex]\\ \tt\hookrightarrow n=1/2269.7=0.0004mol[/tex]
No of molecules=No of moles×Avagadro no
[tex]\\ \tt\hookrightarrow 0.0004(6.023\times 10^{23})[/tex]
[tex]\\ \tt\hookrightarrow 2.4\times 10^{20} molecules [/tex]
Hi there!
Note: 1 mole of a any gas at ST and Pressure (273 K and 1 atm) occupies a volume of 22.4 dm^3
=> x mole of oxygen occupies 1.00 dm^3
Therefore, the mole of oxygen on 1.00 dm^3 is :
[tex]mole \: of \: oxygen = \frac{1.00 {dm}^{3} \times 1 \: mole}{22.4 \: dm^{3} } = 0.044642857 \: mole[/tex]
Also note that Avogadros Constant says: 1 mole of any gas contains [tex]6.022 \times {10}^{23}[/tex]molecules.
Hence, 0.044642857 mole of oxygen will contain :
[tex]0.044642857 \times 6.022 \times {10}^{23} = 2.69 \times {10}^{22} \: molecules[/tex]
Therefore, [tex]2.69 \times {10}^{22} \: molecules \: are \: present \: in \: 1dm^{3} \: of \: oxygen \: at \: stp[/tex]
A chemist is given a 3.00M solution of KBr and needs to measure out 0.733 moles of this solution. How many mL of the 3.00M KBr solution would the chemist need
In order to measure 0.733 moles of KBr from a 3.00 M solution, the chemist needs 244 mL of solution.
What is molarity?Molarity (M) is a unit of concentration of solutions, and it is defined as the moles of a solute per liters of a solution.
Step 1: Calculate the liters of solution required.A chemist has a 3.00 M KBr solution and wants to measure 0.733 moles of KBr. The required volume is:
0.733 mol × (1 L/3.00 mol) = 0.244 L
Step 2: Convert 0.244 L to mL.We will use the conversion factor 1 L = 1000 mL.
0.244 L × (1000 mL/1 L) = 244 mL
In order to measure 0.733 moles of KBr from a 3.00 M solution, the chemist needs 244 mL of solution.
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How many moles is 8.35x 10^25
Answer:
138.65501 moles is your answer
Which is the load
D.
A.
B.
C.
E.
Answer:
A.
Explanation:
In the case of a seesaw, the object at the top is the effort and the object at the bottom is the load.
Which pair of compounds has the same empirical formula? c3h8 and c3h c2h2 and c2h c4h10 and c6h c4h10 and c2h5.
Answer:
The correct answer is the final pair: C4H10 and C2H5
Explanation:
Took the test and it was right. :)
[tex]C_4H_{10}[/tex] and [tex]C_2H_5[/tex] pair of compounds have the same empirical formula.
What is an empirical formula?A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule [tex]CH_2O[/tex] is the empirical formula for glucose.
An empirical formula is the chemical formula of a compound that gives the proportions (ratios) of the elements present in the compound but not the actual numbers or arrangement of atoms.
This would be the lowest whole number ratio of the elements in the compound.
Hence, option D is correct.
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Why is it important for science to keep testing a hypothesis even after they’ve found it to be true?
Answer:
Explanation:
Repeated tests help determine whether the hypothesis is always true in different circumstances. Repeatedly testing a hypothesis qualifies it to be accepted as a theory.
How to clean a nose piercing with antibacterial soap?.
Nitrogen (N) is much more electronegative than hydrogen (H). Knowing this, consider how the electrons will be shared in ammonia (NH3). What do you predict about the polarity of ammonia
Answer:
Ammonia is a polar molecule
Explanation:
Nitrogen is more electronegative than hydrogen, so it's ability to attract electrons is higher.
This means that shared electrons would be mostly pulled towards the central nitrogen atom.
It is a polar molecule because it has an asymmetrical shape, and unequal charges. Nitrogen has lone pair, and lone pair-bonding pair repel second most (after lone pair-lone pair), this contributes to its polarity
You should also note, that hydrogen bonded with either nitrogen, oxygen or fluorine has the most strongest bond called hydrogen bonding.
Hope this helps!
Work done when lifting up the water tank,give the water in the tank________ energy.
Answer:
Kinetic mechanical energy
Explanation:
The water was used to power a generator, creating electric energy.
neutrons have a _______ charge
Answer:
neutrons have a neutral charge
Explanation:
What make them neutral. It means why do we say that they are neutral. The American polymath benjamin Franklin named the charges as positive and the negative. He did this because when one kind of charges are combined they increase their effect but when the same kind was mixed with the other charges the charges used to disapear or loss their strength . so it was clear that there are two types of charges and have got a methametical relation between them . He called them posive and negative charges analogous to positive and negative numbers because when negative numbers are added with the negative number we get a larger negative numbers and vice versa. So it means that every object that we can observe contain charge but of both kinds in same quantity so we call them neutral . so answer to that question would be that it has charge because charge is the fundamental property of particles but it has both +ve and -ve charges equal in magnitude so not any net charge is there on neutron it is in equilibrium.
Can energy be created
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside
Answer:
No energy cannot be created nor destroyed
Explanation:
In case of a chemical spill to your eyes, how many continuous minutes should you use the eye wash station for?.
Answer:
A minimum of 15 to 60 minutesof continuous washing. But it really depends on what you spilled on your eyes, but you should always wash thoroughly.
Answer:
20 min
Explanation:
Avogadro's number represents the number of units in a mole. What is this value?
Answer: 6.02 x 10^23
Explanation: Please look at the photo below for confirmation!
what force types change the direction of motion
Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity. Let’s say an object is moving along a table on earth, suddenly the finite table ends, resulting in the object being present in the air, which means there is no normal contact force N to combat the force by gravity mg, which is why there is an acceleration downwards. This proves as a projectile motion since the direction of motion start changing from horizontal to vertical. Another example is one throwing an object up. It moves up and slows down, reaching its maximum point, leading to it starting to move downwards. This too is a change in motion.
Students measure the weight of some baking soda, a solid. They also measure the weight of some vinegar, a liquid. They mix the substances together and many bubbles appear on the surface of the new liquid. They measure the weight of this new liquid and it is less than the sum of the weights of the baking soda and vinegar before mixing. Why is the weight of the new liquid less than the sum of the weights before mixing? Answer options with 4 options A. because the solid melted B. because the solid dissolved C. because a gas formed and escaped D. because a liquid weighs less than a solid
Answer:
the answer is b because the solid dissolved
Explanation:
What is the mass of 3 moles of Barium acetate, Ba(C2H3O2)2
Molar masses of elements are –
Ba = 137C=12 H=1O=16Mass of Barium acetate –
= 137 +( 12×2 +1×3+16×2)×2
= 137 + 59×2
=255
Mass of 1 mole of Barium acetate is 255.Therefore, mass of 3 moles of Barium acetate will be( 3×255) = 765.water can be synthesized according to the following formula. suppose you have 17 “g” of H2. 2 H2 + O2 -> 2 H2O
In your own words please
Answer:
Sl reproduction occurs when living organisms combine genetic information from two different types.
Explanation:
As one mass increases, what happens to the gravitational force.
Answer:
Gravitational force is directly promotional to the mass
of both interacting objects.
Explanation:
More massive objects will attract each other with
a greater gravitional force. So as the mass of the
either objects increases the force of gravitational
attraction between them also increases.
why is the electron configuration for sulfur [ne] 3s² 3pâ´
BEcause
Explanation:
Sulfur (or sulphur in BrE) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic.
