Answer:
8.324 Hope this helps! =)
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.
what is the moden periodic law
Answer:
Here's what I get
Explanation:
The modern periodic law states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.
[tex] \LARGE{ \underline{ \purple{ \bf{Required \: answer:}}}}[/tex]
When everything wasn't discovered yet....The Scientists gave different opinions and ways to classify the elements discovered in their time.
Modern Periodic table was the most accepted model for arranging the elements on the basis of their Atomic number. So, we can also say that they are also dependent upon the electronic configurations of those elements. It was put forward by Moseley.
#KeepOnExploring
All of the following are true statements EXCEPT a. Solids have a definite volume and a definite shape. b. Liquids have less energy than solids. c. There are no intermolecular interactions between the particles of a gas. d. Sublimation occurs when a solid phases into a gas.
Answer:
The correct answer is B. Liquids have less energy than solids. This is false because liquids have more energy than solids; the particles in a liquid are moving whereas the particles in a solid are almost still (they may vibrate slightly). This increase in speed of particles translates to kinetic energy, showing us that liquids have more energy than solids.
Explanation:
We can also examine the other answer choices and show why they are incorrect.
Solids have a definite volume and shape. Think about solids in your house; for example, think about a chair or a block. The shape of these items cannot be changed, and their volume is unchanging.
There are no intermolecular forces between the particles of a gas. This is assumed to be a property of an ideal gas, which makes sense since the particles in a gas are farther from each other than those in a liquid or a solid.'
Sublimation occurs when a solid turns into a gas. This is also a true statement; when a solid sublimes, it changes into a gas without ever becoming a liquid.
Hope this helps!
zinc does not give hydrogen on reaction with nitric acid
Answer:
The Hydrogen gas produced during its reaction with metal gets oxidised to H2O, hence no hydrogen gas is produced. Instead it evolves nitric oxides such as NO2,NO etc.
If an atom has 15 electrons, how many protons does the atom have?
A:16
B:15
C:14
D:this cannot be determined without looking at a periodic table first
Answer:
15
Explanation:
it would probably be the same number!
Answer:
Explanation:
15
what are the four rules for significant figures
Answer:
Significant Figures
Explanation:
1) Annotation category: ...
2)RULES FOR SIGNIFICANT FIGURES.
3) All non-zero numbers ARE significant. ...
4)Zeros between two non-zero digits ARE significant. ...
5)Leading zeros are NOT significant. ...
6)Trailing zeros to the right of the decimal ARE significant. ...
7)Trailing zeros in a whole number with the decimal shown ARE significant. 8) to make you happy :) hope this helps you :)
We can prove a theory to be correct by performing the right experiment. False or true
Answer:
true
Explanation:
because if you find the right answer that proves the theory to be correct.
13. Which statement best describes an element? *
O any combination of two or more atoms of different types
a pure substance made up of only one kind of atom
O
a substance containing only water molecules
O any kind of crystal
Explanation:
Distinguish chemical substances from mixtures
Key Points
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.
A chemical substance is composed of one type of atom or molecule.
A mixture is composed of different types of atoms or molecules that are not chemically bonded.
A heterogeneous mixture is a mixture of two or more chemical substances where the various components can be visually distinguished.
A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.
Various separation techniques exist in order to separate matter, including include distillation, filtration, evaporation and chromatography. Matter can be in the same phase or in two different phases for this separation to take place.
Terms
substanceA form of matter that has constant chemical composition and characteristic properties. It is composed of one type of atom or molecule.
elementA chemical substance that is made up of a particular kind of atom and cannot be broken down or transformed by a chemical reaction.
mixtureSomething that consists of diverse, non-bonded elements or molecules.
Answer:
a pure substance made up of only one kind
Explanation:
What is the specific heat of a 75.01 g piece of an unknown metal that exhibits a 45.2°C temperature change upon absorbing 1870 J of heat?
Answer:
[tex]Cp=0.552\frac{J}{g\°C}[/tex]
Explanation:
Hello,
In this case, the formula to compute the required heat based on the mass, specific heat and change in temperature is widely known as:
[tex]Q=mCp\Delta T[/tex]
In such a way, since we are asked to compute the specific heat, we solve for it as shown below:
[tex]Cp=\frac{Q}{m\Delta T}=\frac{1870J}{75.01g*45.2\°C} \\ \\Cp=0.552\frac{J}{g\°C}[/tex]
Best regards.
The specific heat of the metal exhibiting 45.2 [tex]\rm ^\circ C[/tex] temperature change has been 0.55 J/g.[tex]\rm ^\circ C[/tex].
The specific heat can be defined as the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.
The expression can be given as:
Q = mc[tex]\Delta[/tex]T
where, Q = heat required = 1870 J
m = mass = 75.01 g
c = specific heat capacity
[tex]\Delta[/tex]T = change in temperature = 45.2 [tex]\rm ^\circ C[/tex]
1870 J = 75.01 g [tex]\times[/tex] c [tex]\times[/tex] 45.2 [tex]\rm ^\circ C[/tex]
c = [tex]\rm \dfrac{1870}{75.01\;\times\;45.2}[/tex]
c = 0.55 J/g.[tex]\rm ^\circ C[/tex]
The specific heat of the metal exhibiting 45.2 [tex]\rm ^\circ C[/tex] temperature change has been 0.55 J/g.[tex]\rm ^\circ C[/tex].
For more information about the specific heat capacity, refer to the link:
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A chemistry class is experimenting with iodine to see which common white powder items will react and make the iodine change color. Which item listed will have a chemical reaction with iodine?
Answer:
The question did not contain any listed options. However, starch is a common white powder that will give a color change on reacting with iodine molecules
Explanation:
Iodine is a common indicator used in the lab to detect the presence of starch or starchy substances.
Iodine molecules react with amylose in starch to form a complex with a deep blue-black coloration.
Hence, a common white powder which reacts with iodine molecules to give a blue-black color must be a substance that contains starch.
The answer is:
d) cornstarch
Dos vehículos colisionan. Se sabe que antes del choque el vehículo 1 de masa "m", se desplazaba horizontalmente hacia la derecha con U1=10 m/s y el vehículo 2 cuya masa es el 30 % de la masa del vehículo 1, se desplaza horizontalmente hacia la izquierda con velocidad de 8m/s. Si hay pérdida de energía en la colisión, la expresión matemática que mejor representa dicha situación es:
Answer:
translate? ill edit this later
Explanation:
Find the density of a substance that has a mass of 75 g and a volume of 35 mL. Don't forget your units!
Answer:
The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 [tex]\frac{g}{mL}[/tex]
Explanation:
Density is a characteristic property of a substance that relates to the amount of mass it has per unit volume. In other words, density is the property that matter, whether solid, liquid or gas, has to compress into a given space (it measures the amount of mass in a given volume of a substance). It is calculated as the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, you know:
mass= 75 gvolume= 35 mLReplacing:
[tex]density=\frac{75 g}{35 mL}[/tex]
Solving:
[tex]density=2.14\frac{g}{mL}[/tex]
The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 [tex]\frac{g}{mL}[/tex]
The density should be2.14 g/ml.
Given that,
A mass of 75 g and a volume of 35 mL.Based on the above information, the calculation is as follows:
[tex]Density = mass \div volume\\\\ = 75 \div 35[/tex]
= 2.14 g/mL
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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.
To learn more about Empirical observations, refer to the link:
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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
The scattering of a stream of positively charged particles when striking a thin film of gold confirms that the positive charge in an atom must be located in a dense central mass. atoms contain electrons in varying energy layers around the nucleus. electrons are found in the center of an atom. electrons can only be found within predicted areas surrounding the nucleus.
Answer:
According to Thompson's model, Every atom consists of a positively charged sphere of radius 10-- 10m in which entire mass and positive charge of the atom are uniformly distributed inside the sphere electrons are embedded like seeds in watermelon. According Rutherford entire poistive charge and mass of the atom are concentrated in a tiny central core of the atom which is called atomic nucleus contains. Size of nucleus = 10-- 15m. The nucleus contains protons and neutrons. Negatively charged electrons revolve around the nucleus in circular orbits.
Explanation:
Answer:
A
Explanation:
On a cold morning, the smoke coming out of a chimney is observed to be in blue color. What could be the reason? Name the effect and the reason for the effect
Stack effect? I'm not totally sure about this...
Explanation:
Large amount of tiny particles of water droplets, dust and smoke are present on a misty day. These tiny particles in the air scatter blue colour of white light passing through it. When this scattered light reaches our eyes, the smoke appears blue.
Calculate the solubility of CaF2 in water at . You'll find data in the ALEKS Data tab. Round your answer to significant digits.
Answer:
[tex]0.016\frac{g}{L}[/tex]
Explanation:
Hello,
In this case, the dissociation of calcium fluoride is:
[tex]CaF_2(s)\rightleftharpoons Ca^{2+}(aq)+2F^-(aq)[/tex]
And the equilibrium expression is:
[tex]Ksp=[Ca^{2+}][F^-]^2[/tex]
Which is useful to compute the molar solubility, symbolized by [tex]x[/tex] as the reaction extent:
[tex]Ksp=(x)(2x)^2[/tex]
In such a way, since the solubility product of calcium fluoride at 25 °C is 3.45x10⁻¹¹, the molar solubility is found to be:
[tex]3.45x10^{-11}=(x)(2x)^2\\\\x=\sqrt[3]{\frac{3.45x10^{-11}}{4} }\\ \\x=2.05x10^{-4}M=2.05x10^{-4}\frac{molCaF_2}{L}[/tex]
And the solubility, considering its molar mass 78.08 g/mol is:
[tex]=2.05x10^{-4}\frac{molCaF_2}{L}*\frac{78.08gCaF_2}{L}\\ \\=0.016\frac{g}{L}[/tex]
Regards.
A cylinder rod formed from silicon is 21.3 cm long and has a mass of 5.00 kg. The density of silicon is 2.33 g/cm3. What is the diameter of the cylinder? (the volume of cylinder is given by π r2h, where r is the radius and h is the length)
Answer:
11.32cm
Explanation:
This question describes a cylinder rod formed from silicon with length 21.3cm and mass 5kg. The density of the silicon is 2.33g/cm3.
To calculate the diameter, the radius is needed. To calculate the radius, the volume is needed. To calculate the volume, the formula: density = mass (m) / volume (V) is used.
Mass = 5kg, which is 5 kg × 1000g = 5000g
Density= 2.33g/cm3
Hence; volume= mass / density
= 5000/2.33
= 2145.9 cm3
Volume of cylinder= πr^2h
Where h= 21.3cm and π= 3.142
That is; r^2 = volume/πh
= r^2 = 2145.9/3.142×21.3
= r^2 = 2145.9/66.9246
= r^2 = 32.06
r= √32.06
r= 5.66cm
If radius of the cylinder is 5.66cm, the diameter is twice of the radius.
That is, diameter (d) = 5.66 × 2
= 11.32 cm
Therefore, the diameter of the cylinder is 11.32cm.
state two things you notice when a metal is touched
Answer:
touched touched
Explanation:
rusting can occure
sonority may take place
1. If my car gets 26 miles to the gallon and the tank can hold 13.2 gallons of gas, how many miles can I travel?
Answer:
343.2 miles
Explanation:
To find the miles that you can travel with 13.2 gallons of gas, you can use a rule of three given that you know that the car gets 26 miles to the gallon:
1 gallon → 26 miles
13.2 gallons → x
x=(13.2*26)/1
x= 343.2
According to this, the answer is that you can travel 343.2 miles.
Indica que tipo de reacción es cada una, escribe el nombre que le corresponde a cada una. 1.Mg + H2SO4 → MgSO4 + H2 2. 2 KI + Pb(NO3)2 → PbI2 + 2 KNO3 3. 2 Zn + O2 → 2 ZnO 4. Zn + CuSO4 → ZnSO4 + Cu 5. Na2CrO4 + 2 AgNO3 → Ag2CrO4 + 2 NaNO3 6. H2O → 2 H2 + O2 7. SO3 + H2O → H2SO4 8. HCl + NaOH → NaCl + H2O 9. Cl2 + 2 KBr → 2 KCl + Br2 10. CaCO3 → CaO + CO2
Answer:
Ver respuesta abajo
Explanation:
En este caso, para saber el tipo de reacción de cada uno, necesitamos saber los tipos de reacción, que en este caso son los siguientes:
a) Combinación (C): Tan sencillo como que tengo 1 elemento o compuesto, que se combina con otro elemento o compuesto, formando uno nuevo:
A + B ----> AB
b) Desplazamiento (D): aquí un elemento reemplaza a otro en un compuesto, formando un compuesto nuevo:
A + BC ----> AC + B
c) Descomposición (Ds): Es lo opuesto a combinación. Un compuesto se descompone o se separa en dos o mas elementos básicos por efecto del calor o electricidad:
AB ----> A + B
d) Doble desplazamiento (DD): en este caso, dos elementos de compuestos diferentes se intercambian, formando nuevos compuestos:
AB + CD ------> AC + BD
Siguiendo estos pequeños conceptos, veamos el tipo de reacción de cada reacción puesta:
1. Mg + H2SO4 ----> MgSO4 + H2 (D) (Mg desplaza al H2)
2. 2KI + Pb(NO3)2 ----> PbI2 + 2KNO3 (DD) (K y Pb intercambian compuestos)
3. 2Zn + O2 ----> 2ZnO (C) (se unen el Zn y el O)
4. Zn + CuSO4 ---->ZnSO4 + Cu (D) (Zn reemplaza al Cu)
5. Na2CrO4 + 2AgNO3 ----> NaNO3 + Ag2CrO4 (DD) (Na y Ag forman dos compuestos nuevos)
6. 2H2O ----> 2H2 + O2 (Ds) (El agua se separa en dos elementos)
7. SO3 + H2O ----> H2SO4 (C) (se formó un nuevo compuesto)
8. HCl + NaOH ----> NaCl + H2O (DD) (Na y H formaron dos compuestos nuevos)
9. Cl2 + KBr ----> 2KCl + Br2 (D) (Cl reemplaza al Br)
10. CaCO3 ----> CaO + CO2 (Ds) (CaCO3 se separó en dos compuestos)
At STP what is the volume of 2.56 mol CH4?
Answer:
Volume = 57.34 dm³Explanation:
The volume of a gas can be found by using the formula
V = n × V(dm³)
where
n is the number of miles
V is the volume
V(dm³) is the volume of 1 mole of a gas at STP which is 22.4 dm³
From the question
n = 2.56
The volume is
V = 2.56 × 22.4
We have the final answer as
Volume = 57.34 dm³Hope this helps you
what are fundamentals quantities ? Name them .
Answer:
Fundamental quantities or base quantities are:
✔️Lengthy
✔️Mass
✔️Time
✔️ Temperature
✔️Electric current
✔️Amount of substance
✔️Intensity of light
Explanation:
Hope it will help you :)
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.
What is the maximum amount of electrons that can be in the third energy level of an atom? (question continued in comments)
Answer:
18 electrons
Explanation:
If you search on Google you get the same answer, so the question gives you your answer.
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....
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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
If your mixing cement for the foundation of a building and it calls for 1.55 tons of sand, how many grams of a sand are you using? Please show your work, and report your answer with the correct number of significant figures and appropriate units.
Answer:
1406136 grams
Explanation:
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.
Provide two arguments on why you don't notice the land moving beneath you, defend your answer.
Answer:
The reference point is the ground.
Explanation:
•Moves slow that you don't notice hope this helps you :) god loves you :)