Answer:
The long form of the periodic table divides the elements into four major blocks known as s, p, d, and f.
The period to which a given element belongs can easily be determined from its electron configuration. Based on electron configurations, the periodic table can be divided into blocks denoting which sublevel is in the process of being filled.
Hope it helps.
X
Which process is a chemical change?
A burning a match
B. boiling water
OC melting ice
OD. breaking glass
Find the density of a block with a length of 8.0 cm, a width of
4.0 cm, a height 2.0 cm, and a mass of 32 g. Would this block
float or sink in water?
Answer:
Density = 0.5 g/cm³Explanation:
Density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass = 32g
To find the density we must first find the volume of the block
From the question the block is a cuboid
Volume of cuboid = length × width × height
length = 8 cm
width = 4 cm
height = 2 cm
Volume of block = 8 × 4 × 2 = 64 cm³
Substitute the values into the above formula and solve for the density
That's....
[tex]Density = \frac{32}{64} \\ = \frac{1}{2} [/tex]
We have the final answer as
Density = 0.5 g/cm³
The block will float because it's density is less than the density of water which is
1 g/cm³
Hope this helps you
Answer:
d= 0.5 g/ cm³
The block will float in water.
Explanation:
The density of an object can be found using the following formula:
[tex]d=\frac{m}{v}[/tex]
where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume. We know the block has a mass of 32 grams. We don't know the volume, therefore we must calculate it.
Let's assume the block is a cube. The volume of a cube can be found using the following formula.
[tex]v=l*w*h[/tex]
The length is 8 cm, the width is 4 cm and the height is 2 cm.
[tex]l= 8 cm \\w= 4cm \\h= 2cm[/tex]
[tex]v= 8 cm * 4 cm * 2cm[/tex]
[tex]v=32 cm^2 * 2cm[/tex]
[tex]v= 64 cm^3[/tex]
Now we know the volume and can substitute it into the formula, along with the mass.
[tex]d=\frac{m}{v}[/tex]
[tex]m= 32 g\\v= 64 cm^3[/tex]
[tex]d=\frac{32 g}{64 cm^3}[/tex]
Divide 32 grams by 64 cubic centimeters.
[tex]d= 0.5 g/cm^3[/tex]
The density of the block is 0.5 grams per cubic centimeter. The density of water is 1.0 g/cm³. Any object with a density that is less than 1 will float in water. 0.5 is less than 1, so this object will float in water.
Why does paper "brown" after a while?
Answer:
Exposure to oxygen (especially when combined with sunlight) alters the molecular structure of lignin, causing a change in how the compound absorbs and reflects light, resulting in the substance containing oxidized lignin turning a yellow-brown color in the human visual spectrum.
3. A wave has a wavelength of 10 m and a speed of 340 m/s. What is the frequency of the
wave?
Answer:
We have the wavelength which is 10,speed/velocity=340 and frequency=?.
The formula is velocity=frequency × wavelength.
340=f × 10.
340=10f.
frequency=34hertz.
Answer:
34hertz
Explanation:
We have the wavelength which is 10,speed/velocity=340 and frequency=?.
The formula is velocity=frequency × wavelength.
340=f × 10.
340=10f.
frequency=34hertz.
Read the following statement.
Changes must occur at a structural level in order to be considered chemical.
Which detail from the article provides the BEST example to support this statement?
A
For instance, a block of wood may feel rough when you run your finger across it but rubbing the wood with sandpaper smooths the surface so it no longer feels rough.
B
A piece of metal may be heated in a fire until it glows, but the metal is the same material before heating and after cooling.
C
Think about ice melting into water, and then water being heated up and turning into steam.
D
The creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
Answer:
D
Explanation:
A new substance must form in a chemical change. structure, properties and composition must change in a chemical change.
The creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
What is reaction?Reaction is defined as a process in which one or more substances are also called as reactant, are convert to one or more different substance known as product.
There are basically five types of reaction
Combustion reactionDecomposition reactionNeutralization reactionPrecipitation reactionSynthesis reactionA new reaction must have chemical change as well as physical change such as structure, properties and composition.
Thus, the creation of a new, solid substance from two liquid substances indicates that a reaction has taken place and altered the original substances.
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An experiment looking at structures smaller than a cell would most likely employ a
a. dissecting microscope
b. transmission electron microscope
c. scanning electron microscope
d. compound light microscope
Answer:
In a conventional optical microscope, objects less than about 200 nanometers apart cannot be distinguished from one another. ... Although electron microscopes produce a detailed image of very small structures, they cannot provide an image of the proteins that make up those structures.
Answer:
b. transmission electron microscope
Explanation:
what energy is released when we burn natural gas
Answer:
Heat Energy... I am pretty sure?
Explanation:
There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, heat energy is released when we burn natural gas.
What is energy transfer in thermodynamics?Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Convection is the flow of heat from one layer of liquid to another layer. Heat energy is released when we burn natural gas. This reaction is called combustion reaction.
Therefore, heat energy is released when we burn natural gas.
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Help plz this was due 2 days ago but I don’t understand it at all
Answer:
4 mile : 253440 inches
0.004 grams : 1.814 grams
56 miles/hour : 82.133 feet per second
4.5 ml : 0.45 centilitre
34.g/ml : 74.9571691 lb/liter
30 lb: 480 ounces
difference between speed and velocity
Answer:
speed is a scalar quantity and velocity is a vector quantity.
Speed is distance/time and velocity is displacement/time
Answer:
Velocity is vector and speed is scalar
Explanation:
help!! what does area measure
Answer:
34
Explanation:
7) All of the following are
external factors of the
photosynthesis EXCEPT*
O A. Light intensity
O B .Temperature
O c. Chlorophyll content
O D .Oxygen
Answer:
D. Oxygen
Explanation:
External factors of photosynthesis
Light intensityTemperatureChlorophyll contentCarbon dioxideImmediate product
GlucoseByproduct
OxygenHope this helps ;) ❤❤❤
6. Many changes have been made to atomic theory since Daltons time.
A. List the key difference between modern atomic theory and dalton's atomic
theory
B. What important aspect of scientific theories is illustrated by these differences
Answer:
A. Modern atomic theory is, of course, a little more involved than Dalton's theory but the essence of Dalton's theory remains valid. ... Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.
B. The explanation becomes a scientific theory. In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time.
describe the energy inputs and outputs for the campfire. Use the law of conservation of energy to construct a valid qualitative equation that includes all the input and output energies involved.
Answer:
The essence including its particular subject is outlined in the following portion mostly on clarification.
Explanation:
The energy throughout the campfire comes from either the wood's latent chemical energy until it has been burned to steam up and launch up across the campfire. The electricity generation for something like a campfire seems to be in the context including its potential chemical energy which is contained throughout the firewood used only to inflame the situation.The energy output seems to be in the different types of heat energy radiating across the campfire, laser light generated off by the blaze, and perhaps a little number of electrical waves, registered throughout the firewood cracking whilst they combust throughout the blaze.and,
chemical energy ⇒ heat energy + light energy + sound energy
what is the radius of earth 6378000 meters in scientific notation
Answer:
[tex]6.378*10^{6}m[/tex]
Explanation:
we have zeroes so that can be
[tex]6378*10^{3} m[/tex]
and we can continue moving the decimal point three more times
[tex]6.378*10^{6}m[/tex]
how many particles are their in 2.080 moles
Answer:
There are 1.253*10²⁴ particles in 2.080 moles
Explanation:
Avogadro's number is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole. In other words, Avogadro's number is the number of molecules that one mole of any substance contains. Its value is 6.023 * 10²³ particles per mole.
So, you can apply a rule of three as follows: if 1 mole has 6.023*10²³ particles, then 2.080 moles, how many particles does it have?
[tex]amount of particles=\frac{2.080 moles*6.023*10^{23}particles }{1 mole}[/tex]
amount of particles= 1.253*10²⁴ particles
There are 1.253*10²⁴ particles in 2.080 moles
PLEASE HELP WITH CHEM CLASS!!!!!
Please please please !! Explain depth. Please !!!!
Answer:
The answers to your questions are given below
Explanation:
1. KClO3 => Potassium trioxochlorate (V)
Thermal decomposition of KClO3.
When we heat potassium trioxochlorate (V), KClO3, it will slip into two producing potassium chloride, KCl and oxygen gas, O2 as shown below:
2KClO3(s) —> 2KCl(s) + 3O2(g)
Note: the above reaction will occur faster and at a lower temperature in the presence of manganese (iv) oxide as catalyst.
2a. Determination of the number protons and neutrons in Nitrogen–14.
Nitrogen–14 has the following:
Mass number = 14
Atomic number = 7
Proton =?
Neutron =?
Atomic number of an atom is simply the proton number. Therefore,
Proton = Atomic number
Atomic number = 7
Proton = Atomic number = 7
Proton = 7
Mass number = Proton + Neutron
Mass number = 14
Proton = 7
Neutron =?
14 = 7 + Neutron
Collect like terms
Neutron = 14 – 7
Neutron = 7
Therefore, Nitrogen–14 has 7 protons and 7 neutrons.
2b. Determination of the number protons and neutrons in Nitrogen–15.
Nitrogen–15 has the following:
Mass number = 15
Atomic number = 7
Proton =?
Neutron =?
Atomic number of an atom is simply the proton number. Therefore,
Proton = Atomic number
Atomic number = 7
Proton = Atomic number = 7
Proton = 7
Mass number = Proton + Neutron
Mass number = 15
Proton = 7
Neutron =?
15 = 7 + Neutron
Collect like terms
Neutron = 15 – 7
Neutron = 8
Therefore, Nitrogen–15 has 7 protons and 8 neutrons.
what is mean by exhaustible natural resources of list some
Answer:
enr are those resources which are present in limited quality and can be use completely used up by human activities are called enr .example coal petrol
Homeostasis subheading
The maintenance of stable internal conditions is called
Answer:
homeostasis•the maintenance of a stable internal environment
Hope this helps :)
what is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the solutes solubility
Answer: DILUTE SATURATED
Explanation:
Answer:
b. saturated
Explanation:
(:
What are the names of the varibles that a scientist uses when performing a scientif investigation
experiment)?
Answer:
Manipulated (independent) Variable and Responding (Dependent) Variable
BRAINLIEST TO FIRST ANSWER I JUST NEED HELP my teacher refuses to help me so I just want to know im doing this right pretend the ones with slashes are fractions 0.56kg = ? mg 0.56kg x 1000 g/1 kg x 1000 mg/1 g = 560,000 mg bro im so confused also heres the problem if that's hard to understand i just want to know im doing it right
Answer:
0.56kg=?mg
0.56kg x (1000 g/1kg) X (1000mg/1g) = 560,000mg
Explanation:
You got it right. Great Job!
Solve for a. a(b + c)=d
a = d/(b + c)
Explanation:a(b + c) = d
a = d/(b + c)
Answer:
[tex]\huge \boxed{a= \frac{d}{b+c} }[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]a(b+c)=d[/tex]
Dividing both sides by (b + c).
[tex]\displaystyle a= \frac{d}{(b+c)}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Which of the following substances is more likely to dissolve in water? Which of the following substances is more likely to dissolve in water? HOCH2CH2OH O || CH3(CH2)9CH CCl4 CHCl3 CH3(CH2)8CH2OH
Answer:
HOCH₂CH₂OH
Explanation:
You generally assume that polar dissolves polar and nonpolar dissolves nonpolar. Since water is polar, we are looking for a polar molecular.
This cancels out CH₃(CH₂)₉CH and CCl₄.
You are left with CHCl₃, CH₃(CH₂)₈CH₂OH, and HOCH₂CH₂OH. You would pick the third option since it is the most polar.
The compound HOCH2CH2OH having two O - H groups is more likely to interact with water.
A substance is soluble in water if it is capable of interacting in an electrostatic interaction. Water can form hydrogen bonds with other molecules that posses polar O - H bonds.
Hence, looking at the options provided in the question, we will observe that the compound HOCH2CH2OH having two O - H groups is more likely to interact with water.
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what mass of silver has a volume of 105.0 cm^3? The density of silver is 10.50 g/cm^3
Answer:
mass = 1102.50 gExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
Making mass the subject we have
mass = Density × volumeFrom the question
Density of silver = 10.50 g/cm³
Volume = 105 cm³
Substitute the values into the above formula and solve for the mass
That's
mass = 10.5 × 105
We have the final answer as
mass = 1102.50 g
Hope this helps you
What period is the atom in?
1.
What group is the atom in?
What is the name of this atom?
What other atom would have similar
properties to the atom?
Will this atom conduct electricity well?
Answer:
Put these atoms in order from most negative overall charge to least negative
overall charge.
11 Atom X: 104 protons, 102 electrons
11 Atom B: 24 protons, 18 electrons
1 Atom Q: 15 protons, 16 electrons
11. Atom P: 7 protons, 10 electrons
Explanation:
What period is the atom in?
1.
What group is the atom in?
What is the name of this atom?
What other atom would have similar
properties to the atom?
Will this atom conduct electricity well
what is burning considered ?
A. physical change
B.chemical change
C.none of the above
D.all of the above
You are given a cube of pure copper when you calculate the density using
your measurements, you get 8.78 grams/cm3. Copper's accepted density
is 8.96 g/cm3. What is your percent error? *
Answer:
2.01% to the nearest hundredth.
Explanation:
Percent error =[ (8.96-8.78) / 8.96]* 100
= 0.020089 * 100
= 2.0089 %
The Percent error is 2.01% to the nearest hundredth.
How to calculate the percent error?Suppose the actual value and the estimated values after the measurement are obtained. Then we have:
Error = Actual value - Estimated value
To calculate percent error, we will measure how much percent of actual value, the error is, in the estimated value.
[tex]\rm Percent \: Error = |\dfrac{Error}{Actual value}|\times 100 \\\\[/tex]
[tex]Percent \: Error = | \dfrac{\text{(Actual Value - Estimated Value)}}{Actual value}|\times 100 \\[/tex]
(here |x| is such that it makes x non negative, thus, |-5| = 5, and |5| = 5)
WE have been given a cube of pure copper when you calculate the density using your measurements, you get 8.78 grams/cm3. Copper's accepted density is 8.96 g/cm3.
Percent error =[ (8.96-8.78) / 8.96]* 100
= 0.020089 * 100
= 2.0089 %
Hence, the Percent error is 2.0089 %.
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three examples of polysaccharides
Answer:
starch
Cellulose
glycogen
Hope this help :)
A rock has a mass of 211 grams and occupies a volume of 72 centimeters cubed what is it density?
Answer:
Density = 2.9 g/cm³Explanation:
The density of a substance is given by
[tex]Density(\rho) = \frac{mass}{volume} [/tex]From the question
The mass of the stone is 211 g
It's volume is 72 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density(\rho) = \frac{211}{72} [/tex]Density = 2.930
We have the final answer as
Density = 2.9 g/cm³Hope this helps you
A graduated cylinder has 3.5 liters of oil. How many milliliters of oil is available in the graduated cylinder? O 3.5 mL O 3500 mL O 35 mL 350 mL
Answer:
3500 Ml
Explanation:
1 liter is equal to 1000 milliliters
3.5 liters is equal to 3500 milliliter