Answer:
730 N
Explanation:
force =mass ×acceleration
force= 73kg×10m/s
F=730N
What is the lowest frequency photon that can ionize a hydrogen atom with excited state electron configuration 3s^1?
1. Which of the following shows the process of freezing?'
A.candle wax cooling on the table
B.pouring cola over ice
C. heating a cup of water
D. particles are speeding-up and colliding more
Answer:
A. candle wax cooling on the table
Explanation:
Candle wax cooling on a table is an example of freezing because the atoms in the candle wax start to slow down as the wax cools. This is considered "freezing" because the slower an atom is vibrating then the colder it is and of course the faster an atom is vibrating then the hotter it is! :)
need little help pls
Answer:
0.354 molal
Explanation:
The molarity (M) or the concentration of a solution is defined as the number of moles of a compound in the solution per liter of solution (mol/L), whereas molality, is defined as the number of moles of a compound in the solution per kg of the compound (mol/kg).
Given that the density of the solution is 1.202 g/mL, which is equivalent to 1.202 kg/L. Since the prefix mili- denotes a factor of one thousandth ( [tex]10^{-3}[/tex] ) and kilo- denotes a factor of one thousand ( [tex]{10}^3[/tex] ),
[tex]1.202 \ \frac{g}{mL} \ = \ 1.202 \ \frac{g}{(10^{-3}) L} \ = \ 1.202 \ \frac{{10}^3g}{L} \ = \ 1.202 \ \frac{kg}{L}[/tex].
To calculate the corresponding molality of the solution, the formula
[tex]Molality \ (mol/kg) \ = \ \frac{Molarity \ (mol/L)}{Density \ (kg/L)}[/tex] is used.
Therefore,
[tex]Molality \ = \ \frac{0.426 \ mol/L}{1.202 \ kg/L} \ = \ 0.354 \ mol/kg \ \ (3 \ s.f.)[/tex]
why are electric switches and boards are made up of plastic
why are electric switches and boards are made up of plastic
Answer:-Because plastic is a poor conductor of electricity.
Explanation:-Plastics do not conduct enough heat and electricity. Therefore, it is used in the manufacture of plug switches, plug boards, etc.
A student wants to determine the melting point of water as part of an investigation into the strength of electrostatic forces. The student considers determining the freezing point of water instead. Is this a valid option?
According to the forces of attraction freezing point and boiling point of water are different and are not related to strength of electrostatic forces.
What are forces of attraction?
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Which property is the same for a 50 mL sample of liquid water and a 100 mL sample of liquid water?
Answer: The density because it stays the same with any same liquids or solids or gas with whatever amount of it is added. It only changes if the matter of state is different or there is any environmental change.
Could a single person or animal be a point source pollution
Answer:
the main cause of pollution is mankinds work like gases and extreme heat caused by factories and cars and littering is also caused by people's careless throwing away so In term man kind is responsible for the pollution
Explanation:
which is the compound that has the higher boiling point and explain why we see the
differences we do
a. ethane vs. ethene
b. heptyne vs. pentyne
c. octane vs. octanal
thanks!
Answer:
b I think it is the correct answer
All of the following compounds are soluble in water EXCEPT
a
MgSO4
b
Ca(NO3)2
с
Agi
d
K2CO3
Answer:
Anser is C Agl
Explanation:
Agl does not dissolve in water.
All of the following compounds are soluble in water except AgI because of very high value of lattice energy. Therefore, the correct option is option C.
The capacity of a material, the solute, to combine with a different material, the solvent, is known as solubility in chemistry. Insolubility, or the solute's inability to create such a solution, is the opposite attribute. The concentration for the solute within a saturated solution—a solution where no more of the substance can be dissolved—is typically used to gauge the degree of a substance's solubility in a particular solvent. The two compounds are considered to be at the point of solubility equilibrium at this time. All of the following compounds are soluble in water except AgI because of very high value of lattice energy.
Therefore, the correct option is option C.
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Which element on the periodic table is the lowest mass in period 4??
Answer:
potassium I believe is the correct answer
Explanation:
Potassium is the period four element with the lowest mass; its average mass is 39.0983amu.
The fourth period of the periodic table is where potassium has its lowest atomic mass.
What is atomic mass?Atomic mass is defined as the combined mass of an atom's protons, neutrons, and electrons. The term "atomic mass" refers to the weight of an atom or molecule. To determine the average mass of elements and molecules as well as to resolve stoichiometry issues, the atomic mass is used.
An electrically neutral atom has an equal number of protons and electrons. As a result, using any of the two formulas, we may calculate the atomic mass of an element. The atomic mass of an element grows as we move from left to right in a period of the periodic table. In the fourth period of the current periodic table, Krypton has the highest atomic mass and potassium has the lowest.
Thus, the fourth period of the periodic table is where potassium has its lowest atomic mass.
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Explain the verse below in your own words in a little summary.
Hebrews 11:7
God had warned Noah of the flood and directed him to build an ark. Noah had faith in God and began building.
Answer:
God Warned Noah for the Flood comindg to Earth to wash away all the bad people's lives and god also said get couple animals girls and boys then build an ark then bring your family and food there to then noah had a faith in god so he obey and start builind the ark in a top of a mountain
Explanation:
Hebrews 11:7
USCTIR ENFIK meaning?
Answer:
la branche de la mécanique concernée par le mouvement des objets sans référence aux forces qui provoquent le mouvement
Answer:
the features or properties of motion in an object.
( picture ) identify each type of reaction shown below
it wouldnt let me type it because it said it was too inappropriate
Explanation:
Answer ASAP pls
The electromagnetic spectrum is the portion of energy that reaches the Earth from the Sun. However, the human eye can still only detect a portion of that spectrum because of the _____________ of the visible light waves.
wavelengths
troughs
crests
amplitude
Answer:
wavelengths
Explanation:
A 4.190 g sample of an oxide of chromium contains 2.179g of chromium, what is its empirical formula?
a. CrO2
b. Cr2O
c. CrO3
d. Cr2O3
I'm not sure but I think it is C. CrO3
Fill in the blank for the following statement: ________ is the movement of rocks, sand, or materials from a place?
Answer:
Erosion.
Explanation:
It can be as small as a grain of sand or as large as a boulder. Sediment moves from one place to another through the process of erosion. Erosion is the removal and transportation of rock or soil. Erosion can move sediment through water, ice, or wind.
the normal human eye responds to visible light of wavelength range from about 390 to 710nm. Determine the frequency range of the human eye.
Explanation:
=>7.7 x10¹⁴ to 4.2 x10¹⁴Hz
Help i dont get it
Answer:
2. Products; FeCl2 and H2S
Reactants; FeS and HCl
3. a) 36g of water
b) 64g of oxygen
Which statement describes a homogeneous catalyst?
It is in a gaseous phase only.
It is in the same phase as the reactants.
It is completely consumed by reactants.
It forms different products than the uncatalyzed reaction forms.
Answer:
it is in the same phase as the reactants
The statement describes a homogeneous catalyst is,
It is in the same as the reactants.So, option B is correct one.
What is homogeneous catalyst?The homogeneous catalyst is refer to catalytic system.In this, the phase of substrates for a reaction and catalytic components are same.Mainly it is in liquid phase.Example: Production of acetic acidWhat is catalyst?
The substance which increases the rate of the reaction without being itself change at the end of the reaction is called catalyst.
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How many moles are in 500 g of P
Answer:
.....................
30.973761
WILL GIVE BRAINLIEST (also pls don't copy answers from other ppl :D) Question: Choose two spheres of Earth which interact when hot springs are formed. Use complete sentences to explain how they interact during this process.
Answer:
Geosphere and Hydrosphere.
Explanation:
Hot springs are heated by geothermal heat—heat from the Earth's interior. In volcanic areas, water may come into contact with very hot rock heated by magma. The geosphere and hydrosphere interact when hot springs form. The geosphere gets a little melted by the hot hydrosphere and then when the springs shoot up in the air they break some rocks.
Check all of the following below which describe experimental errors that would affect the percent chloride you report in your experimental results: ____________
a) The solid product was wet when you weighed the final mass
b) You added excess silver nitrate into the reaction mixture
c) The liquid collected from the filtration was cloudy
d) The transfer from the reaction beaker to the filter funnel was imperfect (you lost some of the reaction solution or some was left in the beaker)
e) Extra water was used to dissolve the original unknown solid
The options that describe the experimental errors that would affect the percent of chloride reported are:
B (You added excess silver nitrate into the reaction mixture) and D (The transfer from the reaction beaker to the filter funnel was imperfect).While performing experiments, there are some errors that occur which are generally known as experimental errors.
These experimental errors are the difference between the true measurement and what we measured.
There are three types of experimental errors they include:
systematic, random, and human error.Human errors occur due to carelessness of the observer.
Examples are:
when you added excess silver nitrate into the reaction mixture when the transfer from the reaction beaker to the filter funnel was imperfect due to lost of some of the reaction solution.Therefore, the options describe the experimental errors that would affect the percent of chloride reported are B and D.
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Mole problems. See the image for reference. Please show your work.
As part of an investigation into the strength of electrostatic forces between molecules of water, a student will measure the melting point temperature. Which part of the experimental design does this describe?(1 point)
determining the procedure
determining what data to collect
deciding on the appropriate equipment
deciding on the number of trials to perform
Which experimental design would be best to use in investigating the boiling points of water and ethanol?
Heat samples of water and ethanol in two separate beakers using a Bunsen burner. Measure the temperatures at which the samples boil using a thermometer. Record these temperatures as the boiling points.
Mix samples of water and ethanol in a beaker, then heat using a Bunsen burner. Measure the temperature at which the sample boils using a thermometer. Record this temperature as the boiling point.
Heat samples of water and ethanol in two separate beakers using a Bunsen burner. Measure the temperatures at which the samples boil using a thermometer. Conduct several trials and record the average temperatures as the boiling points.
Mix samples of water and ethanol in a beaker, then heat using a Bunsen burner. Measure the temperature at which the sample boils using a thermometer. Conduct several trials and record the average temperature as the boiling point.
Which change happens when a substance melts?(1 point)
The vibration of the molecules produces enough heat to weaken the forces of attraction between the molecules of the substance.
Heat energy overcomes the forces of attraction between the molecules of the substance, so the molecules can move more freely.
Heat energy forces the molecules of the substance farther apart until the rigid structure of the solid breaks.
The molecules of the substance move farther apart, which pulls on the intermolecular bonds between them.
Which change occurs to cause water to boil into steam?(1 point)
The addition of kinetic energy causes the motion of water molecules to overcome gravitational forces.
The addition of kinetic energy causes the motion of water molecules to overcome gravitational forces.
The removal of kinetic energy causes the motion of water molecules to overcome electrostatic forces.
The removal of thermal energy causes the motion of water molecules to overcome gravitational forces.
Answer:
1) B. determining what data to collect
2) C. Heat samples of water and ethanol in two separate beakers using a Bunsen burner. Measure the temperatures at which the samples boil using a thermometer. Conduct several trials and record the average temperatures as the boiling points.
3) B. Heat energy overcomes the forces of attraction between the molecules of the substance, so the molecules can move more freely.
4). The addition of thermal energy causes the motion of water molecules to overcome electrostatic forces.
Explanation:
I think these are the answers, i'll confirm when I finish the test.
In an experiment it is known what quantity has to measured, thus the measurement of melting point has been determining what data to collect. Thus, Option B is correct.
To investigate the boiling point of water and ethanol, the samples has to boiled at constant parameters and the data has been collected with several trials. Thus, option C is correct.
Melting has been described as the change of the solid to the liquid state. With melting, there has been heat energy higher than the force of attraction allowing the molecules to move freely. Thus, option B is correct.
The boiling has been the change in the water at liquid state to the gaseous state. With boiling there is thermal energy capable of increasing the motion of water molecules overcoming electrostatic force.
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Draw the Lewis structures for
Calcium bromide, CaBr2
The Lewis structure is the way of expressing the covalent bonding in molecules. The covalent bond formation takes place by the sharing of electrons in a molecule.
What is Lewis structure?In Lewis dot structures or simply the Lewis structures, the dots are used to represent the electrons. They provide a picture of bonding in molecules in terms of the shared pair of electrons and the octet rule.
The concept of covalent bond is introduced by the scientist G.N Lewis. According to him, the atoms achieve stable octet when they are linked with each other by sharing of one more pairs of electrons. The covalent bonding occurs between the atoms which do not differ much in their electronegativity.
The Lewis structure of CaBr₂ is denoted below. Here two bromine atoms acquires a stable electronic configuration by sharing electrons. There are two single bonds between them.
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How do plants use the energy from the sunlight?
Answer:
Hey mate....
Explanation:
This is ur answer....
Plants use a process called photosynthesis to make food. During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Starch is stored in seeds and other plant parts as a food source.
Hope it helps!
Brainliest pls!
Follow me! :)
Answer:
Plants use photosynthesis to convert sun light into their own food to consume. Green plants use this light energy to change water and carbon dioxide into oxygen and nutrients called sugars. The plants use some of the sugars and store the rest. The oxygen is released into the air.
What is the correct form of the equilibrium constant for the reaction of hydrogen and oxygen to form water? The equation is:
2H 2( g) + O 2( g) ⇌ H 2O( g)
Kc = ([H2O]/[O2] [H2])
Kc = ([H2O]/[O2] [H2]2)
Kc = ([H2O]/[O2] [H22])
Kc = ([H2O]2/[O2] [H22])
Kc = ([H2O]/[O2] [2H2])
I’m not sure if it’s the square on the right or left. Please help
Answer:OK im not 100% sure but it should be the right one
Explanation:
A 33.4−L volume of methane gas is heated from 22°C to 66°C at constant pressure. What is the final volume of the gas?
Answer:
38.38 L (3 d.p.)
Explanation:
In response to questions addressing the expansion of gas via heating, Charles's Law should be considered. Charles's Law is an experimental gas law explaining the tendency of gases to expand when heated.
The law states that the volume ([tex]V[/tex]) of a gas is directly proportional to its temperature ([tex]T[/tex]) given that the pressure ([tex]P[/tex]) and the amount of gas ([tex]N_{A}[/tex]) are constant.
[tex]\displaystyle\frac{V}{T} \ = \ k \ \ \ \ \ \ \ or \ \ \ \ \ \ \ V \ = \ kT[/tex], where k is a proportionality constant.
*Note that when substituting temperature into the equation, the temperature must be in terms of the Kelvin scale and not in degrees Celsius. The relation between the Kelvin scale and the Celsius scale is [tex]\mathrm{K} \ = \ ^{\circ}\mathrm{C} \ + \ 273[/tex].
Charles's law can be used to compare changing conditions of a particular gas. Let [tex]V_{1}[/tex] and [tex]T_{1}[/tex] be the initial volume and temperature for the gas, while [tex]V_{2}[/tex] and [tex]T_{2}[/tex] be the final volume and temperature. The mathematical relationship of Charles's law becomes:
[tex]\displaystyle\frac{V_{1}}{T_{1}} \ = \ \displaystyle\frac{V_{2}}{T_{2}}[/tex].
In accordance with the question,
[tex]V_{1} \ = \ 33.4 \ \mathrm{L}, \ T_{1} \ = \ (22 \ + \ 273) \ \mathrm{K} \ = \ 295 \mathrm{K}, \ T_{2} \ = \ (66 \ + \ 273) \ \mathrm{K} \ = \ 339 \ \mathrm{K}[/tex]
while [tex]V_{2}[/tex] is the final volume of the gas that we would like to find. Therefore,
[tex]V_{2} \ = \ \displaystyle\frac{V_{1} \ \times \ T_{2}}{T_{1}} \\ \\ V_{2} \ = \ \displaystyle\frac{33.4 \ \mathrm{L} \ \times \ 339 \ \mathrm{K}}{295 \ \mathrm{K}} \\ \\ V_{2} \ = \ 38.38 \ \mathrm{L}[/tex].
what is oxidation number on Ni in the next compound
K2[NiBr6] ???
Explanation:
The oxidation number of Ni is +4