Answer:
You may assume that the same metal is used in each situation. Light is emitted by electrons when they drop from one energy level to a lower level.
Classify each of the following values by the number of significant figures present in each. 8.314 J/mol-K 6.022x10 23 mol-1 12 mL 1.2 years 7.0 m2 50, cm 0,005 L 40.7 g 670.90 in 0.6258 mg 2.205 lb 3270 ft 90 m 5 significant 4 figuressignificant 3 figuressignificant 2 figuressignificant 1 figures
Answer:
5 significant figures: 670.90 in.
4 significant figures: 8.314 J/mol-K, 6.022x10 23 mol-1, 0.6258 mg, 2.205 lb and 3270 ft.
3 significant figures: 40.7 g.
2 significant figures: 12 mL, 1.2 years, 7.0 m2, 50, cm and 90 m.
1 significant figure: 0,005 L.
Explanation:
Hello,
In this case, we proceed as follows:
* 8.314 J/mol-K has 4 significant figures since 8, 3, 1 and 4 are significant (nonzero).
* 6.022x10 23 mol-1 has 4 significant figures since 6, 0, 2 and 2 are significant including the zero as it is at the right of the first nonzero digit (6).
* 12 mL has 2 significant figures since 1 and 2 are significant (nonzero).
* 1.2 years has 2 significant figures since 1 and 2 are significant (nonzero).
* 7.0 m2 has 2 significant figures since 1 and 2 are significant (nonzero).
* 50, cm has 2 significant figures since 1 and 2 are significant (nonzero).
* 0,005 L has 1 significant figure since 5 is the only nonzero digit.
* 40.7 g has 3 significant figures since 4, 0 and 7 are significant including the zero as it is at the right of the first nonzero digit (4).
* 670.90 in has 5 significant figures since 6, 7, 0, 9 and 0 are significant including the zeros as they are at the right of the first nonzero digit (6).
* 0.6258 mg has 4 significant figures since the first zero is at the left of the first nonzero digit, therefore, it is not included.
* 2.205 lb has 4 significant figures since 2, 2, 0 and 5 are significant including the zero as it is at the right of the first nonzero digit (2).
* 3270 ft has 4 significant figures since 3, 2, 7 and 0 are significant including the zero as it is at the right of the first nonzero digit (3).
* 90 m has 2 significant figures since 1 and 2 are significant (nonzero).
Regards.
Convert the following:.0995Kg=.
g
Answer:
995
Explanation:
1kg = 1000g
lalalalalalalalalalalalallalalalalalalalalalalalalalalalalalalala
Answer:
995kg = 995000g
Explanation:
1 kg = 1000 g
Find the density of a moving box that weighs 898 grams and has a volume of 300 cm3.
Answer:
d ≈ 3 g/cm³
Explanation:
Density Formula: d = m/v
Step 1: Define variables
mass m = 898 grams
volume v = 300 cm³
Step 2: Substitute and evaluate
d = 898 g/300 cm³
d = 2.99333 g/cm³
d ≈ 3 g/cm³ (1 sig fig)
How many mL are equal to .0024 L?
Answer:
1
Explanation:
1000ml=1l
? =0.0024l
0.0024/1000×1
0.0000024ml
Volume has been the amount of space covered and occupied by the substance. The volume of the substance has 0.0024 liters is equivalent to 2.4 milliliters.
What is volume?Volume has been defined as the three-dimensional space that has been occupied by the substance in space. It has been measured in derived units of length like cubic meter (m³), cubic centimeter (cm³), liter (l), and milliliter (ml).
The units of the volume can be converted into various derived units by multiplication and division of the units. The small units are derived from larger ones by multiplying and larger units are converted into smaller ones by division.
Given,
Volume = 0.0024 L
Converting units as:
1 liter = 1000 mL
0.0024 L = 2.4 mL
Therefore, the volume is 2.4 milliliters.
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From the list of substances, identify each as a strong acid, strong base, or neither a strong acid nor a strong baseDrag the appropriate items to their respective bins. Strong acid Strong base Neither a strong acid nor a strong baseHNO3 HCl NaCl Ca(OH)2 CH3COOH CH3NH2 CH3OH HF RbOH
Answer:
Answer is in the explanation
Explanation:
All acids that dissociates completely in water are considered strong acids. In the same way, bases that dissociates completely in water are strong bases. All hydroxides made from alkali metals and heavier alkali earth metals are strong bases.
HNO3 dissociates completely in water: STRONG ACID.
HCl dissociates completely in water. STRONG ACID.
NaCl is a salt. Neither a strong acid nor a strong base.
Ca(OH)2. Heavy alkaline earth metal. STRONG BASE.
CH3COOH an acid that doesn't dissociate completely in water. Neither a strong acid nor a strong base.
CH3NH2 is a weak base that doesn't dissociate completely in water. Neither a strong acid nor a strong base.
CH3OH. Methanol is an alcohol. Neither a strong acid nor a strong base.
HF is a weak acid; doesn't dissociate completely in water. Neither a strong acid nor a strong base.
RbOH. Is an hydroxide made from alkali metal. STRONG BASE.
In the metric system, the ________ describes the relationship of each unit to the base unit.
a. suffixb. none of the answer choices are correct.c. synonymd. punctuatione. prefix
Answer:
prefix
Explanation:
In a metric system the prefix shows the relationship of each unit to the base unit.
The metric system is an international system of measurement that uses base units of meter for measuring distance, liter for measuring volume and grams for measuring mass.
The metric unit can be smaller or bigger than the base unit, hence, when using the metric system, the prefix shows the relationship between each unit to the base unit.
Thus, we can conclude that the prefix shows the relationship of each unit to the base unit.
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How important are minerals in our daily lives?
Explanation:
minerals are common in vitamin product iron and calciumall provide day to day nutrients dad the bmicoody needs in order to function food that are full of
Answer:
It is very important in our lives....
Explanation:
It is used to create the materials,used in construction of roads and buildings,they also serve as critical components in the manufacturing of high tech electronics.
is xenon (xe) more or less reactive than bromine (br)? why?
Answer:
Xenon is less reactive.
Explanation:
Xenon is a noble gas with 8 valence electrons whereas bromine is a halogen with 7 and is very reactive.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, xenon (xe) is less reactive than bromine (br) as xenon has noble gas electronic configuration.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Xenon (xe) is a 18 group element of a periodic table. The electronic configuration of these are of noble gas. Noble gases are very unreactive. These can't react at even harsh condition. Bromine belongs to group 17 of parodic table that is to halogen family. Halogens have high electronegativity. these are very reactive. the ere one electron less than the noble gas electronic configuration.
Therefore, xenon (xe) is less reactive than bromine (br) as xenon has noble gas electronic configuration.
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Convert 75 mL of water to gallons (show work)
Answer:
[tex]\huge\boxed{\sf 75\ mL = 0.02\ gallons}[/tex]
Explanation:
1 mL = 0.000264 gallons
Multiplying both sides by 75
75 mL = 0.000264 * 75 gallons
75 mL = 0.02 gallonsHow are sheep used as a symbol in the alchemist book?
Explanation:
Santiago's sheep in the novel alchemist symbolize, the sheep symbolize the ideals of modesty, simplicity and self-actualization in their peaceful yet fulfilled lives. ... Santiago also learns the lessons of life by watching his flock, and later these lessons are enhanced when he explores the desert and hears his inner voice.
What is the mass number of an
atom which contains 21 electrons,
21 protons, and 24 neutrons?
21
66
42
45
Answer:
66 i think
Explanation:
because i add 21+21+24=66
Is melting sugar a chemical or physical change? Please provide an explanation
Answer:
Hola Amigo! Here's Ur Answer :D
Explanation:
The chemical reaction we are most familiar with is that of melting: sugar decomposes at a temperature ranging between 184 and 186°C. This is a very recent discovery we owe to a team of researchers in Illinois. Basically, when we heat sucrose gently, this produces a phenomenon known as “ apparent melting ”.
Happy to Help! :D
Answer:
physical change is what the answer above is saying for anybody who is confused
Explanation:
a physical change has to do with appearance while chemical change has to do with composition. melting the sugar does not change the fact its just sugar therefore not changing the composition.
HOPE THIS HELPS!!! :)
<333333333333
Select the appropriate shape for the given volume formula
Answer: Cylinder , Sphere , Rectangular prism , Cone
i did an online work
Explain why each molecule has a higher vapor pressure at a given temperature than the other in the pair. Match the words in the left column to the appropriate blanks in the sentences on the right. a. does not exhibit dispersion forces b. does not exhibit dipole-dipole forcescc. is polar d. has a smaller molar mass e. does not exhibit hydrogen bonding . 1. The main reasons why CH4 has a higher vapor pressure at a given temperature when compared to CH3Cl is that CH4____and_____. 2. The main reasons why H2CO has a higher vapor pressure at a given temperature when compared to CH3OH is that H2CO_____and_____.3. The main reason why CH3OH has a higher vapor pressure at a given temperature when compared to CH3CH2CH2OH is that CH3OH_____.
Complete Question
The complete question is shown on the first image
Answer:
1 The main reasons why CH4 has a higher vapor pressure at a given temperature when compared to CH3Cl is that CH4 has a smaller molar mass and does not exhibit dipole to dipole force .
2. The main reasons why H2CO has a higher vapor pressure at a given temperature when compared to CH3OH is that H2CO has a smaller molar mass and does not exhibit hydrogen bonding
3. The main reason why CH3OH has a higher vapor pressure at a given temperature when compared to CH3CH2CH2OH is that CH3OH has a smaller molar mass
Explanation:
The higher vapor pressure of the molecules at the given temperature has been based on the molar mass and the binding between the atoms of molecules.
1. The main reasons why [tex]\rm CH_4[/tex] has a higher vapor pressure at a given temperature when compared to [tex]\rm CH_3Cl[/tex] is that [tex]\rm CH_4[/tex]:
Has a smaller molar mass, and Does not exhibit dipole-dipole forcesThus options b and c are correct.
2. The main reason why [tex]\rm H_2CO[/tex] has a higher vapor pressure at a given temperature when compared to [tex]\rm CH_3OH[/tex] is that [tex]\rm H_2CO[/tex]:
Has a smaller molar mass, and Does not exhibit hydrogen bondingThus options c and e are correct.
3. The main reason why [tex]\rm CH_3OH[/tex] has a higher vapor pressure at a given temperature when compared to [tex]\rm CH_3CH_2CH_2OH[/tex] is that [tex]\rm CH_3OH[/tex]:
Has a smaller molar mass.Thus Option c is correct.
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Which is the most stable? Carbon (C) Sodium (Na) Helium (He)
PLS HELP!!
Nitric acid is made by a sequence of reactions, shown below.
4NH3(g) +5O2(g) = 4NO(g) + 6H2O(g)
2NO(g) + O2(g) = 2NO2(g)
3NO2(g) + H2O(g) = 2HNO3(g)+ NO(g)
If the first reaction occurs with 96.2% yield, the second reaction occurs with a 91.3% yield and the third reaction proceeds with a 91.4% yield,
calculate the following:
(a) The grams of nitric acid produced from 1216 grams of ammonia.
(b) The percent yield for the overall process
Answer:
from the 1st equation:
4NH3 4NO
4 *(68) 4*30
1216 X mass of NO = 536.5 g
from the 2nd Equation
2NO 2NO2
2*30 2* 46
536.5 x mass of NO2 = 822.6 grams
from the 3rd Equation
3NO2 2HNO3
3*(46) 2* (63)
822.6 X mass of nitric acid = 751.06 gram
b) % yields = ( 96.2%* 91.3% *91.4%)= 80.3%
What is the purpose of a salt bridge in an electrochemical cell?
Answer:
A salt bridge, in electrochemistry, is a laboratory device used to connect the oxidation and reduction half-cells of a galvanic cell (voltaic cell), a type of electrochemical cell. It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium.
If and acid has a Ka dissociation constant of 1 x 10-9 what is the pKa of this acid?
Answer:
pKa = 9
Explanation:
In this case, we have to remember the meaning of "p". When we use "p" in any calculation we have to apply the minus ten based logarithm, so:
[tex]p~=~-Log[/tex]
For example, when we use the "pH" value. We have to apply the minus ten based logarithm of the concentration of the hydronium ion:
[tex]pH~=~-Log[H^+][/tex]
So, if we have wanted to calculate the pKa value. We have to apply the minus ten based logarithm of the Ka value, so:
[tex]pKa~=~-Log~Ka[/tex]
Now we can plug the value into the equation:
[tex]pKa~=~-Log~1x10^-^9[/tex]
[tex]pKa~=~9[/tex]
The pKa value is 9.
I hope it helps!
A box is pushed down at an angle of 32 degrees on a rough surface. The box moves to the right.
A picture of a woman pushing downward at an angle of 32 degrees with the horizontal on a box. There is a dot in the center of the box and a force pointing southeast away from it labeled F Subscript p.
What equation should be used to find the net force in the y-direction?
F subscript net, y = F subscript N minus F subscript g.
F subscript net, y = F subscript p minus F subscript f.
F subscript net, y = F subscript N minus F subscript g minus F subscript p cos(32).
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Answer:
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Explanation:
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Forces acting on box :
We have four forces acting on the box. Taking the upward direction as positive direction for the vertical axis:
- The push, which pushes down along the ramp inclined at 32 degrees. Its vertical component will be , where F is the magnitude of the push
- The weight of the box, of magnitude , with m being the mass of the box and g being the acceleration of gravity (9.8 m/s^2). This force is already directed vertically downward, so we don't need to resolve it into the vertical direction
- The frictional force, of magnitude , where is the coefficient of friction, directed upward along the inclined plane. Its vertical projection will be
- The normal reaction, whose magnitude is equal to the component of the weight perpendicular to the inclined plane, but with opposite direction (upward): . If we resolve it along the vertical direction.
So, the net force along the y-direction will be:
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
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Express the following in proper exponential notation.
A. 1512 =
B. 0.00529 =
C. 21.52 X 10^-4
Answer:
A. 1.512*10^3
B. 5.29*10^-3
C. 2.152*10^-3
Explanation:
Exponential notation is where a number is represented in the form:
x * 10^n
where x is a number between 1 and 10.
In order to represent 1512 as a number between 1 and 10, we need to divide it by a multiple of 10. In this case, dividing is by 1000 will move it 3 decimal places to the left and get us 1.512 which is perfect. Because we divided by 1000 to get there, 1.512 needs to multiply by 1000 to equal the original number 1512. Since 1000 = 10^3, 1512 in exponential form is:
1.512*10^3
Similarly for the other ones:
0.00529 we need to multiply by 1000 to get to 5.29 (between 1 and 10) so this needs to multiply by 0.001 (1/1000) to equal original number so in exponential form is:
5.29*10^-3 (10^-3 = 0.001)
Finally:
21.52*10^-4 I would recommend converting back to the original number first, which would give us:
21.52*0.0001 = 0.002152
Which we need to multiply by 1000 to get right number so in exponential form is:
2.152*10^-3
Hope this helped!
pls explain how the energy of a marble is transformed as it rolls down a ramp.
Answer:
Energy is not created but transformed meaning the energy just transformed into a different type meaning at all points of the ramp the energy stays the same because all of its energy is just transformed into kinetic energy.
Explanation:
An object has a density of 16.3 g/mL and a volume of 0.46 L. Calculate the
mass of the object in pounds.
Answer:
The answer is
16.50 IbsExplanation:
To find the mass of a substance given the density and volume we use the formula
mass = Density × volumeFrom the question
Density = 16.3 g/mL
volume = 0.46 L
We must first convert the volume from L to mL
If 1 L = 1000 mL
Then 0.46 L = 0.46 × 1000 = 460 mL
Substitute the values into the above formula and solve
That's
mass = 16.3 × 460 = 7498 g
To convert the mass from g to lbs we use the conversion
1g = 0.0022 Ibs
If 1 g = 0.0022 Ibs
Then 7498 g = 7498 × 0.0022
We have the final answer as
16.50 IbsHope this helps you
A certain block is floating in water with 77% of itself submerged. It has a length of 4.3 cm, a width of 5.9 cm, and a height of
2.75 cm. What is its mass, in kilograms?
a. 1.86 kg
b. 2.77 kg
c. 0.0086 kg
d. 5.98 kg
e. 3.62 kg
f. 0.0537 kg
Answer:
f. 0.0537 kg
Explanation:
To solve this, we use the formula for force of buoyancy (Fb) = Vs × D × g
Where; Fb= Force of buoyancy
Vs= Volume of submerged
block
D= Density of water that block
submerges in
g= acceleration due to gravity
In this question, volume of block can be calculated using L×B×H
= 4.3cm × 5.9cm × 2.75cm = 69.7675cm^3
If 77% of the block is submerged in water, then 77/100 × 69.7675cm^3
= 53.72cm^3 is the Volume of submerged block
Density of water is known as 1000kg/m^3 while the gravitational force is 10m/s^2
We need to convert the Vs (volume of submerged block) to m^3 by dividing by 1,000,000
Hence, Vs = 53.72/1000000
Vs= 0.00005372m^3
Using the formula; (Fb) = Vs × D × g
Fb = 0.00005372m^3 × 1000kg/m^3 × 10m/s^2
Fb = 0.5372kg/m/s^2
Therefore, the force of buoyancy of the object on water is 0.5372kg/m/s^2
Recall that; Mass (m) = Volume (V) × Density (D)
Force of buoyancy (Fb) = Vs×D = mass (m) × acceleration due to gravity (g)
i.e. mass = Fb/g
= Mass of the block = 0.5372/10
Mass = 0.05372kg
Therefore, the mass of the block in kg is 0.05372kg
List 5 characteristics of a living thing
Answer:
1.Growth.
2 Reproduction.
3.respond to stimuli
4.are made from more than 1 cell
5.need energy to live
hope this helped
Question 3(Multiple Choice Worth 3 points)
(01.02 LC)
What is the metric unit for mass?
O Meters
O Kilograms
O Pounds
O Matter
Answer:
kilograms
Explanation:
Answer:B) Kilograms
Explanation:I took the test and got it right!
What is the volume of 1.50 lb (pounds) of mercury? The density of mercury is 13.546 g/mL. Use the conversion that 1 kg = 2.20 lb. mL.
Answer:
50.3mL of mercury are in 1.50lb
Explanation:
Punds are an unit of mass. To convert mass to volume we must use density (13.546g/mL). Now, As you can see, density is in grams but the mass of mercury is in pounds. That means we need first, to convert pounds to grams to use density and obtain volume of mercury.
Mass mercury in grams:
1.50lb * (1kg / 2.20lb) = 0.682kg = 682g of mercury.
Volume of mercury:
682g Mercury * (1mL / 13.546g) =
50.3mL of mercury are in 1.50lbElement A has 15 protons. Determine the number of neutrons in its isotope with mass number 33
Answer:
18 i think
Explanation:
Scientists are studying different jackets made for extremely cold, snowy weather. They are trying to find jackets that
are warm but also thin enough to allow for natural bodily movement.
Which question could the scientists answer scientifically?
do
O Which jacket's color looks the best?
O Which jacket traps the most heat?
O Would warm and thin jackets cost less?
Which jacket seems the most professional?
Please anybody can ya help me I have this on my test and if I fail I don’t pass this class
What is the mass of a 67 dL sample of a salt solution?
Answer:
6733.5 g of NaCl
Explanation:
We can assume that the salt solution is a saline solution which contains NaCl in water at 0.90%, whose density is 1.005 g/ml.
So we need to apply the density concept to solve the question.
Density = mass / volume
We convert dL to mL → 67 dL . 100mL / 1 dL = 6700 mL
Density = mass / volume
Volume . Density = mass
6700 mL . 1.005 g = 6733.5 g of NaCl
Classify the organic compounds by the class of their functional group. Drag the appropriate items to their respective bins.CH3COCH2CH2CH2CH3 CH3CH2COOH CH3CH2CH2CHO CH3CH2CH2NH2 Carboxylic acid Amine Ketone Aldehyde Alcohol
Answer:
Explanation:
CH₃COCH₂CH₂CH₂CH₃ ------- Ketone because it contains C = O group .
CH₃COH=CHCH₂CH₂CH₃ ------ Alcohol group because it contains - OH group .
CH₃CH₂COOH ---- Carboxylic group because it contains - COOH group.
CH₃CH₂CH₂CHO ------- Aldehyde group because it contains - CHO group
CH₃CH₂CH₂NH₂ ----- Amine group because it contains - NH₂ group .
The compounds can be categorized as, Carboxylic acid: [tex]\rm CH_3CH_2COOH[/tex]; Amine: [tex]\rm CH_3CH_2CH_2NH_2[/tex]; Ketone: [tex]\rm CH_3COCH_2CH_2CH_2CH_3[/tex]; Aldehyde: [tex]\rm CH_3CH_2CH_2CHO[/tex], and Alcohol: [tex]\rm CH_2COH=CHCH_2CH_2CH_3[/tex].
Organic compounds are the hydrocarbons that has been divided based on the functional groups. The compounds that fall into the following category are:
Carboxylic acid: These are compounds with the presence of carboxylic group -COOH. The carboxylic compound has been [tex]\rm CH_3CH_2COOH[/tex].Amine: These are compounds with the presence of amine group -[tex]\rm NH_2[/tex]. The amine compound has been [tex]\rm CH_3CH_2CH_2NH_2[/tex].Ketone: These are compounds with the presence of ketone group -C=O. The ketone compound has been [tex]\rm CH_3COCH_2CH_2CH_2CH_3[/tex].Aldehyde: These are compounds with the presence of aldehyde group -CHO. The aldehyde compound has been [tex]\rm CH_3CH_2CH_2CHO[/tex].Alcohol: These are compounds with the presence of hydroxyl group -OH. The alcohol compound has been [tex]\rm CH_2COH=CHCH_2CH_2CH_3[/tex].The compounds can be categorized as, Carboxylic acid: [tex]\rm CH_3CH_2COOH[/tex]; Amine: [tex]\rm CH_3CH_2CH_2NH_2[/tex]; Ketone: [tex]\rm CH_3COCH_2CH_2CH_2CH_3[/tex]; Aldehyde: [tex]\rm CH_3CH_2CH_2CHO[/tex], and Alcohol: [tex]\rm CH_2COH=CHCH_2CH_2CH_3[/tex].
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