Answer:
Crushing or grinding increases the surface area of the salt that is exposed to the molecules of water. Stirring increases the speed at which the particles of salt come in contact with the water molecules.
Which of the following choices are types of energy? (Select all that apply) A.kinetic energy B.physical energy C.thermal energy D.chemical energy
Answer:
kinetic, thermal and chemical not physical
The following are types of energy:
Thermal EnergyChemical EnergyKinetic EnergyMeaning of energyEnergy in physics is the ability to do work. Generally it can be said to be the strength, power or ability to do work.
Energy can be contained in a system, can be transformed and can be transfered.
different types of energy are needed in our day to day living.
In conclusion, the types of energy we have are the Thermal Energy, Chemical Energy, and Kinetic Energy etc.
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Type of reaction for H2SO4
Why should an individual working with chemicals understand the hazard coding system
on a chemical label?
Answer:
Explanation:
The hazard coding system (developed by the National Fire Protection Association, NFPA) helps the individual working with chemicals to know which chemical is a health hazard, inflammable hazard or a reactivity hazard. This makes the individual makes informed decisions while handling such chemicals and also assists the individual or first responders to know what to or not to do in emergency cases or accident (like contact with the skin).
NOTE: The colour code used here have the meanings below
Red: flammability/fire hazard
Blue: health hazard
Yellow: reactivity hazard
White: special hazard
Nvermind i messed u. thats not what i meant to outtb ycgdgc8ydsaox agdydac bc7w
Answer:
same
Explanation:
yes, I agree 100% and you are correct *applaud*
Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption?
HYPOTHESIS.
In layman terms, a hypothesis is a rough assumption made according to scant observations. Then test to prove the assumption.
Explanation:
What are two things required for something to be matter?
Explanation:
matter is anything that occupies space and has mass
How are states of matter different at an atomic scale?
Answer:
The bonds that exist between their atoms and molecules differ on an atomic scale.
Explanation:
The three basic states of matter are solid, liquid, and gas. The major difference between them is the strength of the bonds that hold their molecules together. This affects the way that the molecules interact with each other.
The intermolecular forces binding solids together are very strong. This makes solids rigid and not able to move about freely, but rather, only able to vibrate about a mean position.
The intermolecular forces binding liquid atoms together are a lot weaker than that of solids. This makes liquids able to flow.
The intermolecular forces binding gas molecules together are the weakest. As a result, the gases can move about freely and occupy no definite volume.
the members of group IA are called alkali metals. give reason 2 marks
Explanation:
Hey, there!!
Group IA elements are called alkali metals because they are highly soluble in water and produce hydrogen and soluble bases.
For, Eg:
[tex]2na + 2h2o = 2naoh + h2[/tex]
[tex]2k + 2h2o = 2koh + h2[/tex]
Hope it helps...
Mg2+ ?
-magnesium ion
-sodium ion
-manganese ion
-calcium ion
Answer:
Magnesium ion.
Explanation:
Before charge= 2.8.2
after charge= (2.8)2+
A scientist conducts experiments to test what temperature causes the fastest growth rate in sunflower plantsafter multiple trials the results show that sunflower plants grow the fastest at 75 FIs this experement an example of replication or repetition?
Answer:
Repetition
Explanation:
In the world of science, experiments are regularly conducted to test out hypotheses. These experiments are however, not conducted by scientist once to derive a result. They are rather conducted multiple times (repeated) to ascertain the accuracy i.e not as a result of random occurrence. The experiments that undergo multiple trials are said to undergo REPETITION.
This is the case of the scientist in this question, who is conducting an experiment to test what temperature causes the fastest growth rate in sunflower plants. He conducted the experiment multiple times, making it an example of REPETITION.
N.B: Replication is when the experiment is re-conducted by another scientist to see if same result is derived.
if a gas sample in a balloon occupies 1.5 L at atmospheric pressure, what would be the pressure (in mmHg) if the volume was reduced to 0.8 L?
Answer:
1425 mmHg.
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 1.5 L
Initial pressure (P1) = 1 atm
Final volume (V2) = 0.8 L
Final pressure (P2) =?
Next, we shall determine the final pressure of the gas by using the Boyle's law equation as follow:
P1V1 = P2V2
1 × 1.5 = P2 × 0.8
1.5 = P2 × 0.8
Divide both side by 0.8
P2 = 1.5/0.8
P2 = 1.875 atm
Finally, we shall convert 1.875 atm to mmHg.
This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
1.875 atm = 1.875 × 760 = 1425 mmHg.
Therefore, the new pressure of the gas is 1425 mmHg.
Length of a year. 31,560,000.0 seconds = 3.156 X 10^7 seconds
How do I convert into scientific notation
Answer: 3.156 * 10^7
Explanation: I do not really understand your question. You answered it yourself!
Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.
You did everything correctly :) Good job!
Why are forest fires so difficult to extinguish? Make reference to the energetics of combustion reactions.
Answer:Because of the wood
Explanation:Because forests are full of burnable things
What are two things required for something to be matter?
What is the difference between a scientific thenry and a scientific law?
Answer:
Scientific theories are still to be proven while as scientific laws are already proven.
What is a pure substance - bread, salt, seawater, or soil?
Answer:
Salt is the pure substance out of them all.
Answer: Salt is a pure substance. Pure substances are composed of one type of molecule. All of the substances listed are composed of two or more types of molecules, except for salt. Therefore, salt would be your answer.
Hope this helps.
How many seconds in the school year? (One school year is 180 days long.) Please show your work, and report your answer with the correct number of significant figures and appropriate units.
Answer:
259200
Explanation:
multiply 180×24×60
259,200 seconds
180 × 24 hours = 4320 hours
4320 × 60 minutes = 259200 minutes
259200 × 60 seconds = 15552000 seconds
A sample of a substance has a mass of 4.2 grams and a volume of 6 milliliters. The density of this substance is___ grams/milliliter.
Answer:
Answer:- Density of the substance is 0.7
i believe
State the law of moment of force.
Explanation:
when in equilibrium condition the total sum of anti clockwise moment is equal to the sum of clock wise moment
Answer:
Newton's First Law of Motion states that in order for the motion of an object to change, a force must act upon it. This is a concept generally called inertia.
Newton's Second Law of Motion defines the relationship between acceleration, force, and mass.
Newton's Third Law of Motion states that any time a force acts from one object to another, there is an equal force acting back on the original object. If you pull on a rope, therefore, the rope is pulling back on you as well.
Explanation:
Abigail obtained 40.2 grams of calcium carbonate after performing a reaction. From her calculations, she knew she should have obtained 45.8 grams. What was her percent yield? Round your answer to one place behind the decimal. Do not include the unit.
Answer:
Percent yield = 87.77%
Explanation:
Given:
Actual yield = 40.2 grams
Theoretical yield = 45.8 grams
Find:
Percent yield
Computation:
Percent yield = [Actual yield / Theoretical yield] 100
Percent yield = [40.2 / 45.8] 100
Percent yield = 87.77%
A process in which an acid reacts completely with an appropriate amount
of alkali to produce salt and water only is called
reaction *
Disproportionation
Hydrogenation
Dissociation
Neutralisation
Answer:
Neutralisation
Explanation:
HCl + NaOH = NaCl + H2O
how much calcium in gram is present in Ca(NO3)2 that contains 1.4 gram of Nitrogen
Answer:
28.57 grams are in (NO3)2
Explanation:
What’s the difference between a chart and a table?
Answer:
Tables and charts are both used to represent data. However, the manner and circumstances in which each is used, distinguishes them from one another. Tables represent facts and figures in a row and column format which makes the data easier and faster to read and compare. On the other hand, charts represent data in a more graphical manner which may include lines, bars and circles.
Explanation:
I Hope This Helps! ^^
Answer:
A pie chart is a graph in which a circle is divided into sectors, each of which represents a percentage of the overall. Its goal is to show percentages at a specific time in history. Pie charts, unlike bar and line graphs, do not illustrate changes over time. Tables sort the data rationally in a row-and-column format, much to spreadsheets. Tables are used to arrange information that is too detailed or complex to be fully described in a text, allowing the reader to see fast results. They can be used to highlight data trends or patterns, as well as to remove numeric data from a document to make it more readable.
Explanation:
:)
Plz help What is contact process??give detail?
Answer:
This is the current method of producing sulphuric acid in the high concentrations needed for industrial processes.
Explanation:
This is the meaning of CONTACT PROCESS.
Hope it helps.
Critical Thinking Challenge: A student has a part time
job in which she works 4 hour shifts. Her pay scale is
$8.25 per hour. How many Shifts does she need to
work to earn $220?
The question gave you 2 conversion factors, start your
problem with $220.
Answer:
6⅔ shifts
Explanation:
From the question given:
A shift = 4 hours
Pay = $8.25 per hour
Next, we shall determine the number of hours that will result in a pay of $220. This can be obtained as follow:
$8.25 = 1 hour
Therefore,
$220 = $220 × 1 hour / $8.25
$220 = 220/8.25 hours.
$220 = 80/3 hours
$220 = 26⅔ hours
Therefore, it will take 26⅔ hours to receive a pay of $220.
Finally, we shall determine the number of shifts in 26⅔ hours. This can be obtained as follow:
4 hours = 1 shift
Therefore,
26⅔ hours = 26⅔ ÷ 4
26⅔ hours = 80/3 × 1/4
26⅔ hours = 80/12
26⅔ hours = 20/3
26⅔ hours = 6⅔ shifts
Therefore, she will work 6⅔ shifts in order to receive a pay of $220
Calculate the volume in liters of a 29.8 g/dL nickel(II) chloride solution that contains 131. G of nickel(II) chloride . Be sure your answer has the correct number of significant digits.
Answer:
0.44 L.
Explanation:
Density of nickel(II) chloride = 29.8 g/dL.
Mass of nickel(II) chloride = 131 g
Volume of nickel(II) chloride =?
Next, we shall convert 29.8 g/dL to g/L. This can be obtained as follow:
Recall:
1 g/dL = 10 g/L
Therefore,
29.8 g/dL = 29.8 x 10 = 298 g/L
Therefore, 29.8 g/dL is equivalent to 298 g/L.
Finally, we shall determine the volume of nickel(II) chloride as follow:
Density of nickel(II) chloride = 298 g/L
Mass of nickel(II) chloride = 131 g
Volume of nickel(II) chloride =?
Density = mass /volume
298 = 131/Volume
Cross multiply
298 x Volume = 131
Divide both side by 298
Volume = 131/298
Volume = 0.44 L
Therefore, the volume of of nickel(II) chloride is 0.44 L
A turtle moves at a speed of 1.0km/h. How fast is the turtle moving in meter per second (m/s)?
The speed of the turtle is 9.41 centimeters per second.
Calculation of speed:We know that
Speed of small turtle = 566 furlong/fortnight
1 furlong = 20,116.8 cm
And,
1 fortnight = 1,209,600 seconds
So,
The speed of the turtle is 9.41 centimeters per second.
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What is the structural formula of 2-bromo-3-chloro-4,4-dimethylpentanal
Explanation:
5 carbons with their substituents being bromo,chloro and dimethyl
I numbered form 1 to 5 from left to right hence the diagram above
The structure of the compound is shown in the image attached to this answer.
We have to remember that the whole idea of IUPAC nomenclature is to create a generally accepted system of chemical nomenclature such that the structure of a compound can be drawn from its name.
From the name 2-bromo-3-chloro-4,4-dimethylpentanal, we can see that the alkanal moiety should occupy position 1. Counting from that position, the bromime is the next substituent (position 2). The chlorine follows (position 3) and the two methyl groups (position 4) as shown in the image attached.
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An unknown sample of mystery element T is analyzed. According to the data 7.42% of the element is ^6T and 92.58% is ^7T. The true mass of ^6T is 6.02amu and 7.02amu for ^7T. Calculate the average atomic mass and identify the element.
Answer:
[tex]\boxed{\text{6.95 u; Li}}[/tex]
Explanation:
1. Atomic mass of T
To get the atomic mass of T, you calculate the weighted average of the atomic masses of the isotopes.
That is, you multiply the atomic mass of each isotope by a number representing its relative importance (e.g.., its percent of the total).
[tex]\begin{array}{ccrcr}\textbf{Atom} & \textbf{Mass/u} &\textbf{Percent} & \textbf{Calculation}& \textbf{Result/u}\\^{6}\text{T}& 6.02 & 7.42 & 6.02 \times 0.0742 & 0.45\\^{7}\text{T}& 7.02 & 92.58 & 7.02 \times 0.9258& 6.50\\& & &\text{TOTAL } = &\textbf{6.95}\\\end{array}[/tex]
2. Identity of T
Lithium has an atomic mass of 6.64 u.
Element T is lithium.
Why BF3 acts as a Lewis acid???
Answer:
Explanation:
because it has electron deficiency