Answer:
The charge of nucleus will be +2.
Explanation:
Given that,
Proton = 16
Neutron = 14
electron = 18
We know that,
Atomic number :
The number of proton in the nucleus is equal to the atomic number.
The number of protons is equal to the number of electrons for neutral atom.
So, the atomic number is same as the number of electrons.
Here, the number of electron is more than 2 of number of proton.
Hence, The charge of nucleus will be +2.
Q4: What are the prefixes for units
Answer: Explanation:
A unit prefix is a specifier or mnemonic that is prepended to units of measurement to indicate multiples or fractions of the units.
Units of various sizes are commonly formed by the use of such prefixes.
The prefixes of the metric system, such as kilo and milli, represent multiplication by powers of ten.
Answer:
see below
Explanation:
A unit prefix is a specifier or mnemonic that is prepended to units of measurement to indicate multiples or fractions of the units. Units of various sizes are commonly formed by the use of such prefixes. The prefixes of the metric system, such as kilo and milli, represent multiplication by powers of ten. In information technology it is common to use binary prefixes, which are based on powers of two. Historically, many prefixes have been used or proposed by various sources, but only a narrow set has been recognised by standards organisations.
Gerry is looking at salt under a powerful microscope and notices a crystalline structure. What can be known about the salt sample Gerry is looking at?
A. The atoms have spread out from each other.
B. The atoms are sliding past each other.
C. The atoms have no particular pattern.
D. The atoms are vibrating in place.
Answer:
D,the atom are vibrating in place
A small group of a repeating pattern of the atomic structure is defined as the unit cell. It is the building block of the crystal structure. A crystal structure have atoms are vibrating in place. The correct option is D.
What is a crystal structure?The crystal structure is obtained by attaching atoms, groups of atoms or molecules. This structure is formed from the intrinsic nature of the constituent particles to produce symmetric patterns. The ordered arrangement of atoms, ions, molecules form crystal structure.
The oscillation of atoms in a solid about the equilibrium position is defined as the Lattice vibration. It is the equilibrium positions which form a regular lattice because the atoms are bound to neighboring atoms.
Salt is comprised of tiny cubes that are bound together through ionic bonding of sodium and chloride ions.
Thus the correct option is D.
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When the vapor pressure is less than the atmospheric pressure, what will occur? A. The liquid will not boil. B. the liquid will freeze. C. The liquid will boil. D. The freezing point will be lowered.
Answer:
A. the liquid will not boil
convert eachh into scientific notation
4.060 x 10^5 →
7 x 10^3 →
5.0 x 10^-4 →
8 x 10^-2 →
Answer:
0.00580 →
3000 →
0.000908 →
200. →
Explanation:
yay
Answer:
[tex]\large \boxed{\mathrm{view \ explanation}}[/tex]
Explanation:
4.060 × 10⁵ (scientific notation)
The decimal point moves 5 places to the right.
⇒ 406000 (standard form)
7 × 10³ (scientific notation)
The decimal point moves 3 units to the right.
⇒ 700 (standard form)
5.0 × 10⁻⁴ (scientific notation)
The decimal point moves 4 units to the left.
⇒ 0.0005 (standard form)
8 × 10⁻² (scientific notation)
The decimal point moves 2 units to the left.
0.08 (standard form)
Scenario #3 For a lab, you need to make a 10 ml solution using 2.5 grams of salt dissolved in water. 1) List the lab equipment
that will you need? 2) Choose the correct order of steps (procedure) from below that you will follow for weighing out the 2.5 g
of salt. 1. Add the salt to the weigh boat. 2. Measure 10 ml of water. 3. Put the empty weigh boat on the balance. 4. Put the salt
directly on the balance. 5. Press the tare or zero button on the balance. 6. Turn on the balance.
Explanation:
Using percentage by volume (v/v)
When the solute is a liquid, it is sometimes convenient to express the solution concentration as a volume percent.
Formula
The formula for volume percent (v/v) is: [Volume of solute (ml) / Volume of solution (ml)] x 100
Example
Make 1000ml of a 5% by volume solution of ethylene glycol in water.
Procedure
First, express the percent of solute as a decimal: 5% = 0.05
Multiply this decimal by the total volume: 0.05 x 1000ml = 50ml (ethylene glycol needed).
Subtract the volume of solute (ethylene glycol) from the total solution volume:
1000ml (total solution volume) - 50ml (ethylene glycol volume) = 950ml (water needed)
Dissolve 50ml ethylene glycol in a little less than 950ml of water. Now bring final volume of solution up to 1000ml with the addition of more water. (This eliminates any error because the final volume of the solution may not equal the calculated sum of the individual components).
So, 50ml ethylene glycol / 1000ml solution x100 = 5% (v/v) ethylene glycol solution.
When atoms and molecules start getting jumpy
This thing can make steak and potatoes that are lumpy.
Answer:
The following are the explanation of the true statement:
Explanation:
Compounds are sets of atoms which have been chemically related. So, if molecules begin to jump. It can generate lumpy steaks as well as potatoes. In a certain number of protons and electrons were also found in atoms. Electrons are organized into shells or activity levels, that have only certain capabilities if one is complete, electrodes have had to be placed in the next shell.Sulfuric acid was once produced through the reaction of sulfur trioxide with water. Sulfur trioxide can form through the reaction of sulfur dioxide and oxygen gas. When nitrogen monoxide gas is added to the system, the reaction speeds up significantly because it proceeds through the following steps: First: 2 upper N upper O (g) plus upper O subscript 2 (g) right arrow 2 Upper N upper O subscript 2 (g). Second: 2 upper N upper O subscript 2 (g) plus 2 upper S upper O subscript 2 right arrow 2 Upper N upper o (g) plus 2 upper s upper o subscript 3 (g). Identify the catalyst in this reaction, explain how you know it is the catalyst, and describe how it increases the rate of the reaction.
Answer:
NO is the catalyst; it provides a reaction pathway with a lower activation energy
Explanation:
1. Identify the catalyst
A catalyst is a species that is present at the beginning of a reaction and reappears at the end.
It does not appear in the overall equation.
Let's apply these concepts to your mechanism:
First: 2NO(g) + O₂(g) ⟶ 2NO₂(g)
Second: 2NO₂(g) +2SO₂(g) ⟶ 2NO(g) + 2SO₃(g)
Overall: O₂(g) + 2SO₂ ⟶ 2O₂
We see that NO is present at the beginning of the first step. It reacts and then re-forms in the second step. It does not appear in the final equation.
NO is the catalyst.
2. Explain the action of the catalyst
A catalyst acts by providing an alternate pathway with a lower activation energy.
The direct reaction of SO₂ with oxygen to form SO₃ has a high activation energy.
NO reacts with the oxygen to form an intermediate (NO₂) that then reacts with the SO₂ to form SO₃. Both steps have lower activation energies, so the reaction is faster.
Answer:
NO is the catalyst. NO is the catalyst because it increases the rate of the reaction but is not consumed during the reaction. NO increases the rate of the reaction by lowering the activation energy. The reaction of NO with O2 provides an alternative reaction pathway with a lower activation energy.
Explanation: edge 2020
a factor of 8, it means that A is now only 1/8 of its original concentration. A first order reaction, where A → products, has a rate constant of 1.56 × 107 s −1 . At some time, a concentration of 1.06 × 10−6 M of species A is introduced into the reactor. How long does it take for the concentration of A to fall by a factor of 8?
Answer:
It takes 1.32x10⁻⁷s for the concentration of A to fall by a factor of 8
Explanation:
The equation that represents a first-order kinetics is:
Ln ([A] / [A]₀] = -kt
Where [A] is actual concentration, [A]₀ is initial concentration, K is rate constant (For the given problem, 1.57x10⁷s⁻¹ and t is time.
As you want the time when you have [A] in a factor of 8 = [A] / [A]₀ = 1/8
Replacing:
Ln ([A] / [A]₀] = -kt
Ln (1/8) = -1.57x10⁷s⁻¹*t
t = 1.32x10⁻⁷s
It takes 1.32x10⁻⁷s for the concentration of A to fall by a factor of 8
The time taken for the concentration of reactants to fall to 1/8 of its initial value is 1.33 × 10^-7 s.
Initial concentration (Ao) = 1.06 × 10−6 M
Concentration at time t (A) = (1.06 × 10−6 M/8) = 1.325 × 10−7 M
Rate constant (k) = 1.56 × 10^7 s −1
time taken = ?
Where
lnA = lnAo - kt
t = lnAo - lnA/-k
t = ln( 1.06 × 10−6) - ln( 1.325 × 10−7)/1.56 × 10^7
t =(-13.75 ) - (- 15.84)/1.56 × 10^7
t = 1.33 × 10^-7 s
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Why is it necessary to research your experiment before starting it?
Answer: by researching the experiment, it helps you make sure you get everything right. If you didn't research it, there's a possibility you can get the experiment wrong.
Which of the following would be an example of applied science?
Answer:
Applied science is generally engineering, which develops technology, although there might be dialogue between basic science and applied science (research and development). Medical sciences such as medical microbiology are examples of applied sciences.
Explanation:
if a question is testable and can provide an answer based on empirical observations and reasonable logic, it can be answered with science. true or false?
Answer:
True
Explanation:
Just took the test and I got it correct
The statement "if a question is testable and can provide an answer based on empirical observations and reasonable logic, it can be answered with science" is definitely true.
What is an Empirical observation?An empirical observation may be defined as a type of potential examination of information based on scientific data that supports experiments and reveals evidence based on it.
Science can definitely deals with the problems of the natural world. It may potentially answer any type of question which is testable in nature and able to deliver an outcome on the basis of empirical observation and evidence as well as reasonable logic.
In other words, it can be revealed that all sorts of question will be answered with science if they are testable in nature and have scientific methodology.
Therefore, the statement "if a question is testable and can provide an answer based on empirical observations and reasonable logic, it can be answered with science" is definitely true.
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If you wanted to heat a liquid that would splatter when it is heated, you would heat it in a
Answer:
This question lacks options but it will be answered based on the fact that laboratory processes including heating are done using glasswares. The answer is:
Conical or Erlenmeyer/Boiling flask
Explanation:
Glasswares are simply laboratory equipments made of glass. They are used in performing the various laboratory processes like mixing, storing chemicals, heating and cooling etc. Glasswares includes flasks e.g volumetric flask, Erlenmeyer flask etc, beaker, test tube, graduated cylinder etc.
Heating a liquid that would splatter or splash in a laboratory requires using a glassware that can prevent spilling of the liquid outside it. A FLASK such as Erlenmeyer or boiling flask is best suited for this purpose because they generally have a conical shaped body with a narrow neck that prevents liquid chemicals from spilling when heated or shaken. Flasks can also be corked with a lid to prevent the liquid from coming out.
one part of dalton's atomic theory states: compounds are formed by combinations of atoms from two or more elements. is this statement currently considered to be true or false and why?
Answer:
The statement is considered to be true
Explanation:
The statement is true because when elements chemically combine, there are interactions between their valence electrons, causing the two elements to be bonded together to form what is known as a compound.
Compounds can only be formed from interactions between two or more elements. examples include:
Hydrogen + Oxygen = H2O (water)
Sodium + Chlorine = NaCl
Note that if atoms of the same element combine, what is formed is a molecule, not a compound. Some atoms usually do this to attain stability. examples include = O2 H2 and N2. They are oxygen molecule, hydrogen molecule, and nitrogen molecule respectively.
Compounds are only formed when different elements combine to attain electronic stability.
Answer:
what he said was true
Explanation: i wished that i could have said the same.
which of the following statements about the mass of an object is correct
a. mass changes with location
b. mass remains constant
c. mass changes with altitude
d. mass changes with gravity
Answer: Mass remains constant
Explanation:
explain that substances which have covalent bonding can be elements (e.g. H2, O2, N2, C) or compounds (e.g. CH4, CO2, SiO2).
Explanation:
yes, covalent bond can be formed by an element now, from the eg N2 molecules which is formed covalent bond...
we know , the At.no. of N = 7.. the we can find out covalent bond or not....
yes, covalent bond can be formed by compound now, from the eg CH4 compound which is formed covalent bond...
we know , the At.no. of C = 6, H = 1 .. the we can find out covalent bond or not....
if u want more clearly then told me....
And follow me..❤️
How is change viewed in a TRADITIONAL economy?
Answer:
Explanation:
Change is largely shunned in a traditional economy. This is because there are quite a few career choices and most people take the career path of their parents. Also, another example would be that, when it comes to accepting change they hardly do so, because it threatens the survival chances of their society. And as such, they don't really embrace change as it usually means they will have to let go of what they have known all their lives.
Steel is an example of a pure substance because it is made up of two different metals melted together. True False
Answer:
FALSEExplanation:
A pure substance is a element in it's original state. Two metals mixed together are not pure, if they were separated they would be pure. A rock is not pure since it is a mixture of a lot of materials, that formed that rock. Does this help?
Answer:
False
Explanation:
Pure substance has no mixtures
Name the sub atomic particles present inside the nucleus of an atom
Answer:
protons, neutrons and electrons are the sub atomic particles
Convert 42.0 microliters into liters
Explanation:
We need to convert 42.0 microliters into liters. Liters and microliters are the units to find the volume. Volume is the space occupied by an object. We must know 1 micro equals to what. So,
[tex]1\ \mu =10^{-6}[/tex]
So,
[tex]42\ \mu L=42\times 10^{-6}\ L[/tex]
So, there are [tex]42\times 10^{-6}\ L[/tex] in 42 microliters.
Blood is red. Is this an intensive or extensive physical property?
Answer: Intensive physical property
Explanation: Color is an intensive physical property since intensive properties are properties that stay the same no matter the amount of the substance is present. Blood is still red whether or not you have 2 liters of it or 4 liters.
Ceramics resist moisture, do not conduct electricity, and can withstand temperatures higher than molten metals. Propose some uses of ceramics.
Answer:
Ceramics can be used in items where insulation is required or is preferred for the usage of the item. Examples would be bowls, plates, mugs, vases, pots, and other various items.
Explanation:
The reason why ceramics are often used in these items is due to the various properties that ceramics possess. As stated in the question, they are resistant to moisture, don't conduct electricity, and can withstand high temperatures.
Answer:can be used in a place where electric conductivity is not needed and in a place where moisture is not needed.
Explanation:we use ceramics for our bath room mostly because moisture is not needed there
What is the electron change needed to obtain an gallium octet?
Answer:
According to the octet rule, each atom required to complete eight electrons in the outermost shell of p orbital and s- and p- orbitals in an atom's outermost energy level are filled except some atoms. Gallium is one of the exception that does not follow octet rule.
Gallium is a chemical element having atomic number 31 and the electronic configuration of Gallium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p.
The electron change needed to obtain an gallium octet by removing the 4p electron and form Ga+.
Silver jewelry is a mixture of silver and copper. If a bracelet has a mass of 23.56 g, and it is 80.1% silver, the mass of silver in the bracelet is Group of answer choices
Answer:
18.87 g
Explanation:
80.1% of 23.56 g = 18.87 g is the mass of the silver
A student mixed a small amount of iron filings and sulphur powder in a dish. He could not
affect the separation by simple hand-picking. Which liquid will you suggest to affect the
separation?
(a) Carbon di sulphide
(b) Cold water
(c) Boiling water
(d) Kerosene
Answer:
[tex]\huge \boxed{\mathrm{Carbon \ disulphide}}[/tex]
Explanation:
Carbon disulphide is the liquid that can be used to separate iron fillings and sulphur powder.
When carbon disulphide is poured into the dish, the sulphur powder gets easily dissolved in the carbon disulfide. The iron fillings are left to settle on the bottom of the dish.
The iron fillings can get seperated through filtration. When the mixture of sulphur powder and carbon disulphide gets completely evaporated, the sulphur powder is left over.
Carbon disulfide is a liquid that can be used for the separation of iron fillings and sulfur powder. So the correct option is A.
What are separation techniques?
The substances seen around us most of the time are usually not in their pure form. Basically, they are a mixture of two or more substances.
Mixtures are also found and formed in a lot of different forms. Hence, several types of separation techniques are there that can be used for the separation of the mixture of substances. Separation is needed for the removal of all the unwanted materials and also for obtaining useful components from the mixture.
Following are some common methods that are used for the separation of substances or mixtures. These are Handpicking, winnowing, threshing, sieving, distillation, filtration or sedimentation, magnetic separation, separating funnel, etc.
Therefore, carbon disulfide is used and the correct option is A.
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you buy 300mL of soda that weighs 60g. What is the sodas density?
Answer:
20g/cm³
Explanation:
density= mass÷volume
m= 60g÷3cm³
= 20g/cm³
How can i find the number of neutrons in an element
Answer:
The mass number is the sum of protons and neutrons. This means to find the number of neutrons you subtract the number of protons from the mass number. On the periodic table, the atomic number is the number of protons, and the atomic mass is the mass number.
Explanation:
Answer:
Use the equation N=M-n
Explanation:
N=neuron
M=atomic mass
n=atomic munber
Dominick and eva are using the same type of stopwatches to measure the time it takes for a chemical reaction to occur. They can use the same stopwatch to measure the time.
Answer:
They did not repeat their tests multiple times.
Explanation:
It may seem that the question is incomplete. The complete question is as below: Dominic and Eva are using the same type of stopwatches to measure the time it takes for a chemical reaction to occur. They each use the same stopwatch to measure the time. These are their results:
Dominic: 78 seconds
Eva: 81 seconds
Why are their results unreliable and can lead to a pseudoscientific claim?
They did not repeat their tests multiple times.
They used the same type of stopwatch.
They did not change the reactants in their chemical reactions.
Only one person should have collected the data.
Dominic and Eva's results are unreliable and can lead to a pseudoscientific claim because they did not repeat their tests multiple times.
Repeating the test multiple times and finding the average of the measurement will minimize the chance of having error in the measurement and improve the accuracy of the outcome.
Thus, without repeated measurement, the reliability and the validity of the measurement would be in doubt.
The statement "If a plant receives
fertilizer, then it will grow to be
bigger than a plant that does not
receive fertilizer" is an example of
A. an observation.
B. a hypothesis.
C. a theory.
Answer:
A hypothesis
Explanation:
A hypothesis is an intelligent guess that is put forward in order to explain an observation. If it is observed that there is a difference in the rate of growth of plants that receives fertilizer and those that do not receive fertilizer, then we can hypothesize that;"If a plant receives fertilizer, then it will grow to be bigger than a plant that does not receive fertilizer". This is must now be subjected to a series of experiments in order to ascertain its validity.
This is the scientific method.
this question is for science. which options describes the particles of water as liquid water actively boils to become steam?
a. the particles will gain a large amount of kinetic energy.
b. The particles will increase in temperature as they gain thermal energy.
c. the particles will convert kinetic energy into thermal energy.
d. the particles will have the same average kinetic energy
Answer:
The correct option is;
a. The particles will gain a large amount of kinetic energy
Explanation:
As the water temperature reaches 100°C, which is the boiling point for water at atmospheric pressure, the continued heating is then used to break up the strong inter molecular forces between molecules of the water such that the individual molecules are free to move about and due to the high temperature, have gained considerable amount of kinetic energy for the to rise to appreciable height and to also spread.
The heat which converts water into steam is called latent heat as during the boiling phase, the temperature of the water remains constant.
d the particles will have the same average kinetic energy.
Hello I’ll like to get a quick response on my question I’ll give brainliest to the first one or the one that looks like makes more sense thank you!
Answer:
800 N
Explanation:
It is 800 N because it's going in the same direction just like the 1200 N.
Answer:
B
Explanation:
If the crate is stationary that means that the sum of forces is 0
both 1200 N alredy cancel themselves because they are opposite
so we need to cancel the 800N
800 -x =0
x=800 N