Answer:
To draw a Lewis dot structure for an atom, you must know how many valence electrons an atom possesses. The periodic table organizes the elements based on the similarity of their chemical properties.
Explanation:
calcium electron configuration
Answer:
1s2 2s2 2p6 3s2 3p6 4s2
shorthand: [Ar] 4s2
Explanation:
the end number values are exponents, so 1s^2
What is a good description of potential energy? (1 point)
energy of reaction
stored energy
energy of motion
conserved energy
please help me asap!!
Answer:
I think the answer is stored energy
Explanation:
The energy that an item has stored inside it as a result of its location in relation to a zero point is known as potential energy. If an item is placed at a height above the zero height, it has gravitational potential energy. A good description of potential energy is stored energy.
What is potential energy ?Potential energy is the power that an item may store due to its position in relation to other things, internal tensions, electric charge, or other circumstances.
The energy released during a chemical reaction is known as chemical potential energy. It is the energy that was accumulated before chemical fusion. Crackers, a charged battery, etc. are a few examples.
Potential energy has a simple definition, It is a type of energy that possesses the ability to perform work but is not now performing work or exerting any force on any other things. In other words, potential energy concerns object positions rather than object movements.
Thus, option B is correct.
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Would you expect the heterogeneous method to give a higher percent nickel or a lower percent nickel than the homogenous method? Explain your answer.
(From the Quantitative Determination of Nickel in a Compound By Gravimetric Analysis lab)
Answer:
Heterogeneous method
Explanation:
In general, a gravimetric method of analysis consists
of the following steps:
Weighing and dissolving the sample in the proper solvent.
Carrying out a sequence chemical reactions to obtain a suitable product.
Determining the mass of the product
Calculating the composition of the sample rom mass of product and information about the original sample.
Precipitates obtained by heterogeneous methods are often difficult to filter and are always contaminated by adsorbed and occluded impurities which ultimately increase the percentage yield of nickel due to occluded impurities.
How significant is the use of scientific investigation? Explain
Answer:
Explanation:
Scientific investigations produce evidence that helps answer questions and solve problems. If the evidence cannot provide answers or solutions, it may still be useful. It may lead to new questions or problems for investigation. As more knowledge is discovered, science advances.
Which specific reaction can turn iron molten (liquid) as soon as it is formed?
Answer:
Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)
Explanation:
Iron is extracted in a blast furnace. The temperature inside the blast furnace goes a s high as 2000 degrees centigrade.
The iron III oxide ore fed into the furnace reacts with carbon II oxide obtained by the reduction of carbon IV oxide by coke yielding liquid iron and carbon IV oxide
6) Andy has left a bucket of smelly cheese porridge to cool down in the
Kitchen
a) Claire and Dagmar are sitting in the next room. Explain how the smell spreads to Claire's nose by diffusion.
hello!can anyone help?
Explanation:
the air particales are always moving so it also takes the smell of the chesse with it and sreads everywhere in the house.
how would it affect your results if you use a wet Erlenmeyer flask instead of a dry one when transferring your acid solution from a volumetric pipette? pls someone answer pls
Explanation:
Your results would be effected because there is a possibility that the water and chemical substance added into the flask will combine, possibly creating a reaction, either making the solution stronger or weaker, or possibly just messing up your experiment in one go.
For example:
If I paint a picture, and I have a cup that I use in order to put paint in, but the cup is wet and I put my paint in it, my paint will become more liquefied due to the fact water has been added to it, messing the paint up.
why do you think the experimenter conducted this experiment in a lab rather than in the natural world, where this phenomenon was first observed?
Answer:
The experimenter observed this experiment in a lab rather than natural world because it might be dangerous to the atmosphere if he does the experiment in the natural world and it was still an hypothesis so that's why he did it in the lab.
Scientific experiments are specially designed to evaluate explanations for an observed phenomenon. A student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student will carry out the experiment using two identical plants that will only spend different amounts of time in sunlight. All other aspects necessary for growth will remain identical for each. In the experiment described, what would be the amount of water given to each plant?
Answer:
This question lacks options, the options are:
a. an observation
b. a dependent variable
c. an independent variable
d. a control
The answer is D. Control
Explanation:
According to the question, a student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student keeps all other variables needed for the plants' growth in this experiment the same/identical. These variables kept identical by the student is called CONTROL OR CONSTANT.
One of the CONTROL is the amount of water given to each plant. The amount of water given to the two plants being tested must be the same. Hence, WATER in this experiment is a CONTROL VARIABLE.
Note that, the independent/manipulable variable is the amount of time spent in sunlight while the dependent/measurable variable is the growth of the plants.
Answer:
The answer is D control
Explanation:
Mercury has a density of 13.6 g/mL. What is the volume occupied by 112.0 grams of mercury?
Answer:
The answer is 8.24 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 112 g
density of mercury = 13.6 g/mL
We have
[tex]volume = \frac{112}{13.6} \\ = 8.23529411...[/tex]
We have the final answer as
8.24 mLHope this helps you
13. Based on the type of elements in the compound, are there ionic or covalent?
a. KCI
b. NO2
C. Cao
d AIF3
e. HF
f. NBr3
g. MgBr2
Answer:
c
Explanation:
Answer:
《●《HOPE IT HELPS YOU 》●》
ANS--> (C)
C Give two reasons why the formation of aluminium by electrolysis is very
expensive:
Answer:
It is expensive, largely because of the amount of electricity required in the extraction process. Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis.
Bob rides his motorcycle with a constant speed of 116 km/h. How far can he travel in 1 hour?
Answer:
116 km/h
Explanation:
We know that km/h means Kilometers an hour. And if this is constant, then he will travel 116 km/h.
are all metals magnetic?
✅Magnetic materials are always made of metal, but not all metals are magnetic. Iron is magnetic, so any metal with iron in it will be attracted to a magnet. Steel contains iron, so a steel paperclip will be attracted to a magnet too. Most other metals, for example aluminium, copper and gold, are NOT magnetic.
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A student designed an experiment to determine the effect of increasing the temperature of the solvent on the amount of
solute that could be dissolved. Which of the following would be the dependent variable?
A Temperature of the solute
Answer: A Temperature of the solute
Explanation:
During which change of state would the volume of a substance increase the most?
deposition
melting
vaporization
sublimation
Answer:
Correct option d = Sublimation
Explanation:
We know that gases occupy more volume as compared to the solid and liquid. Gases occupy all the available space.
In given option option D is correct because,
Sublimation is the process in which solid is directly converted into the gaseous phase without passing through liquid phase. So when substances under goes sublimation they are converted into gaseous form and occupy more space.
Oher options are incorrect because,
Deposition involve the conversion of gas into solid. Thus volume decreased. This option is incorrect.
Option B is also incorrect because,
Melting involve the conversion of solid into liquid. Volume increased as compared to solid state but not as much like in case of gases.
Option C is also incorrect because,
Vaporization involve the conversion of liquid into gaseous form. Volume also increase in this case but the volume increase in case of sublimation is higher than in case of vaporization that's why this is also incorrect.
Answer:
The correct answer is D. Sublimation
Explanation:
Edge 2020
what is the molecular mass of Au
Answer:
196.96657 u
Explanation:
The Law of Conservation of Mass says that mass
can neither be
nor
A .Gained, lost
B. Created, destroyed
C. Started, ended
D. Opened, closed
Answer:
B
Explanation:
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
The ______,
who loved knowledge and built schools to help their people learn, were
foundational in the study of science.
A.French
B.Chinese
C.Romans
D.Greeks
Given its reactive nature, oxygen is essential to cellular metabolic reactions. Peroxisomes use oxygen to break down fatty acids. In doing so, they use oxygen to remove hydrogens from fatty acid chains, yielding hydrogen peroxide (H2O2). Cells also routinely release potentially destructive molecules, such as superoxide (O2) in signaling, self-defense, or as a metabolic side product. Superoxide combines with hydrogen peroxide to make an even more destructive molecule called a hydroxyl radical. Therefore, the removal of these two reactants is a routine "housekeeping" chore within the cell. Which enzyme is used to prevent hydrogen peroxide accumulation in the peroxisome?
Answer:
Catalase
Explanation:
These reactive oxygen specie or free radicals that cause damage or injury to cells also lead to oxidative stress if unchecked by antioxidants. As suggested in the question, there are several enzymes that act as antioxidants in mitigating the effects of these reactive oxygen specie or free radicals. These enzymes include catalase, superoxide dismutase and glutathiones (such as glutathione s-transferase).
The enzyme that however prevents the accumulation of hydrogen peroxide (H₂O₂) in the peroxisome is catalase. Catalase is an enzyme that is present in the peroxisome; it (catalase) detoxifies/acts on H₂O₂, converting it (H₂O₂) into water and oxygen.
Some household cleaners come in concentrations stronger than necessary for basic cleaning jobs. Jeremy followed the instructions on a cleaning bottle and mixed enough cleaner with 4.0 L of water to form a 1.0 M cleaning solution. After testing his cleaning solution, he decided he should double to concentration for a tough stain. Jeremy added the same amount of cleaner and then added another 4.0 L of water to his bucket. Did Jeremy succeed in making a more concentrated solution? Explain why or why not. *
Answer:
no he just repeated the steps and made more of the same cleaner my guy
Explanation:
A standard weight used to calibrate balances has a mass of 100.00 g and a volume of 12.0 mL. What is the density of this standard weight in g/mL?
88.0 g/mL
8.33 g/mL
0.12 g/mL
7.33 g/mL
Answer:
The answer is 8.33 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 100 g
volume = 12 mL
We have
[tex]density = \frac{100}{12} = \frac{25}{3} \\ = 8.333333...[/tex]
We have the final answer as
8.33 g/mLHope this helps you
1. Which of the following substances are elements? Explain
how you determined your answer.
(a) bronze
(b) tin
(C) chromium
(d) solder
(e) propane
(f) arsenic
(g) nickel
Substances that can be regarded as elements are;
Tin
Chromium
Arsenic
Nickel .
Chemical elements can be regarded as substance that are required to form compounds in chemical reactions.The elements in this question are Tin ,Chromium ,Arsenic ,Nickel, i can know this by checking the periodic table which gives the arrangements of all elements.Solder, Bronze can be regarded as alloy because it contains more than one metal element. Propane is a compound.Therefore, periodic table contains all the elements.
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A change that produces matter with a different composition is a _______ change.
A change that produce matter with a different composition is a chemical change.
Describe how the composition of gases changes as you travel up through Earth’s atmosphere
Explanation:
The composition of the gases never changes until the mesosphere and the thermosphere. -carbon dioxide, oxygen, and methane are only found in the troposphere. -Permanent gases stay the same until you reach the thermosphere.
According to the big bang theory, which describes the universe before the actual big bang occurred? Multiple, cold, dense points, each larger than the sun multiple, hot, dense points, each smaller than an atom single, cold, dense points larger than the sun single, hot, dense points smaller than an atom
Answer:
The correct answer is hot, dense points; each smaller than an atom
Explanation:
The big bang theory was proposed to suggest the expansion of the universe by describing the origin of all components of the universe and it's planetary bodies. It suggested that the whole universe was in a state of high temperature and highly dense points (which were smaller than atoms) but continuously expanded by cooling down which gave rise to the formation of subatomic particles, atoms e.t.c.
Answer:
Its D on edge 2021
Explanation:
just took the test
What volume of a popsicle will have a mass of 45g if the density is 10g/cm3 I NEED THE ANSWER ASAP
Answer:
The answer is 4.50 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass = 45 g
density = 10 g/cm³
We have
[tex]volume = \frac{45}{10} = \frac{9}{2} \\ [/tex]
We have the final answer as
4.50 cm³Hope this helps you
How many moles are in 75.0 grams of K2S?
Answer:
0.6802 mol
Explanation:
1 grams K2S = 0.00907 mol
0.00907 x 75 = 0.6802 mol
(PLS HELP WORTH 50 POINTS)
Click or tap the storage container to transfer the displaced water to the 500 mL graduated cylinders, and determine
how much water was displaced by the football. Record this volume in Table B.
Answer:
there would be 4,300mL of diplaced water
for this all your expected to do is to add all of the volume in the containers together.
View the model of the rover Curiosity.
Which classification best applies to this model?
very large
very small
very mathematical
very complex
Answer: very complex .
Explanation:
Answer:
very complex
Explanation: just took the test