The perimeter can be determined by winding the piece of string around the edges of the object and then measuring the length of the string wound around the object on a ruler.
What is the best way to determine the perimeter of the jigsaw puzzle?The perimeter of an object is the distance around the outside edge of an object.
The perimeter of objects of different regularly-shaped can be determined using the following formulas:
perimeter of a square = 2 * length of a sideperimeter of a rectangle = length * breadthperimeter of a triangle = ¹/₂ base length * heightperimeter of a circle = 2πrFor the irregularly-shaped piece from a jigsaw puzzle, the perimeter can be determined by winding the piece of string around the edges of the object and then measuring the length of the string wound around the object on a ruler.
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Match the mineral group to its examples or definition.
sulfide mineral is made of from metal and sulfphur
Sulfide, also written sulphide, is a category of chemicals that contain sulfur and one or more metals. The majority of sulfides have basic structural characteristics, great crystallographic symmetry, and numerous metal-like characteristics, such as metallic lustre and electrical conductivity.
Sulfides include, for instance, chalcopyrite, galena (the primary ore mineral for lead and silver), and cinnabar (the primary ore mineral for mercury) (which provides copper).
Sulfide minerals are composed of sulfur and one or more metals; sulfarsenides have some of the sulfur replaced with arsenic.
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What is the tendency of a solute to change the melting point of a solid called?
A. Freezing point depression
B. Evaporation point change
C. Phase change depression
D. Boiling point elevation
Answer: Boiling point elevation
Explanation:
Boiling Point Elevation is the property of a solute that allows it to modify the boiling point of a solid. The boiling point of a solution that contains a non-volatile solute becomes greater than the boiling point of the pure solvent (without any solute). As the solute concentration increases in a solution, there is an increment in the boiling point as well hence called the boiling point elevation.
Answer: A. Freezing point depression
Explanation:
What did Henry Moseley change about Mendeleev's Periodic table?
O He ordered the elements by atomic mass.
O He ordered elements with similar properties into columns.
O He ordered elements with similar properties into rows
O He filled in blanks by discovering new elements.
Answer: A. He Ordered them by atomic mass.
Explanation:
This question will walk you through the process of calculating the
number of molecules present in a sample of a compound with a given
mass and chemical formula. This problem will be solved via the
following sequence of conversions: mass → moles → molecules
Consider a dose of Pepto Bismol containing 525 mg of its active
ingredient, bismuth subsalicylate (C7HsBIO4).
Step 2a: Design a problem-solving strategy. Convert the mass given in
milligrams to grams. The molecular formula of bismuth subsalicylate is
C7HsBIO4. What is the molar mass of this compound?
The molar mass of bismuth subsalicylate is 391.12 g/mole.
What is molar mass?
Molar mass of a substance is defined as mass in of one mole of a compound. In a substance the amount of entity present is defined a mole.
Molar mass can be expressed as
M = m/n
Where M is molar mass, m is mass of substance and n is number of moles
To calculate molar mass of C7HsBiO4 is:
12.011 x 7 + 34.1 + 208.98 + 15.99 x 4
= 84.077 + 34.1 + 208.98 + 63.96
= 391.12 g/mole
Thus, the molar mass of bismuth subsalicylate is 391.12 g/mole.
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Draw two cyclic constitutional isomers of trans-1,2-dimethylcyclopentane with the same size ring.
Constitutional isomers, they only differ in the position of the substituents.
What are constitutional isomers?The term isomers refers to the compounds that have the same molecular formula but different structural formulas. This implies that the atom to atom connection and the and the position of the substituents tend to differ quite markedly.
Now when we talk about the constitutional isomers, they only differ in the position of the substituents. The two compounds are essentially the same in the carbon structure but the placement of the substituents do differ. The two cyclic constitutional isomers of trans-1,2- dimethyl cyclopentane with the same size ring are shown in the image attached.
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An ice bag containing 206 g of ice at 0 °C was used to treat sore
muscles. When the bag was removed, the ice had melted and the
liquid water had a temperature of 16.0 °C.
The heat absorbed is 6.69 kJ.
What is the heat absorbed?We know that heat is a form of energy that exists due to a temperature change. Now heat could be added to or removed from a body. The specific heat capacity is a measure of the heat that is required to raise the temperature of 1 g of a substance by one degree Celsius. The higher the specific heat capacity, the more the heat that could be taken in by a body without a corresponding temperature change.
Now we have the following words of information from the question;
Mass of ice = 206g
Initial temperature = 0 degrees Celsius
Final temperature = 16 degrees Celsius
From the literature, we know that the specific heat capacity of ice is obtained as 2.03 J/g∘C
Thus we could write;
H = m c θ
H = heat absorbed/emitted
C = specific heat capacity
Θ = temperature change
H = 206g * 2.03 J/g∘C * ( 16 – 0)
H = 6.69 kJ
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Missing parts;
An ice bag containing 206 g of ice at 0 °C was used to treat sore
muscles. When the bag was removed, the ice had melted and the
liquid water had a temperature of 16.0 °C. How many kilojoules of heat were absorbed?
If a patient receives a dose with an activity of 52.6 mCi of technetium-99m for cardiac imaging, how much radioactivity will be left in the patient’s body 96 hours after injection?
Express the radio activity to 3 sig figs and include the units.
The amount of the technetium-99m that will remain in the patient’s body 96 hours after injection is 0.000803 mCi
How to determine the number of half-livesWe'll begin by obtaining the number of half-lives that has elapsed. This can be obtained as follow:
Time (t) = 96 hoursHalf-life (t½) = 6 hoursNumber of half-lives (n) =?n = t / t½
n = 96 / 6
n = 16 half-lives
How to determine the amount remainingThe amount of the radioactivity remaining in the patient's body can be obtained as follow:
Original amount (N₀) = 52.6 mCiNumber of half-lives (n) = 16Amount remaining (N) =?N = N₀ / 2ⁿ
N = 52.6 / 2¹⁶
N = 0.000803 mCi
Thus, the amount remaining is 0.000803 mCi
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How many moles of atoms are there in 65 molecules of calcium chloride?
There are 65 moles of atoms in 65 molecules of CaCl2 ( Calcium chloride )
In stoichiometry,
1 moles of any substance = 6.022 × 1023 molecules or atoms.
x moles of CaCl2 = 65 * 6.022 × 1023
Cross multiplying this equations
x * 6.022 × 1023 = 1 * 65 * 6.022 × 1023
6.022 × 1023x = 65 * 6.022 × 1023
x = 65 * 6.022 × 1023 / 6.022 × 1023x
x = 65 moles.
This means that there are 65 moles in 65 molecules of CaCl2
What is mole?Mole simply refers to the quantity of atoms, molecules or particles that an atom of an element contains.
1 moles of any substance equals 6.022 × 1023 molecules or atoms.
So therefore, there are 65 moles in 65 molecules of CaCl2 ( Calcium chloride )
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Which part(s) of the molecule can form a hydrophobic interaction with a suitable partner? Check all that appluy:
In the given diagram four number means C=O
Hydrophobic interactions describe the relations between water and hydrophobes and hydrophobes are nonpolar molecules and usually have a long chain of carbons that do not interact with water molecules and the mixing of fat and water is a good example of this particular interaction the tendency of nonpolar groups or molecules to aggregate in water solution in that given image amino acid are given and in that amino acid the NH₃⁺ are in four number and water are didn't attached to NH₃⁺ ion and attached to C=O
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Arrange the measurements from longest length to shortest length.
Answer:
[tex]{ \boxed { \rm{ \: \: \: \: \: \: \: 1 \: mi \: \: \: \: \: \: \: \: }}} \\ { \boxed{ \rm{1 \times {10}^{11} \: nm }}} \\ { \boxed{ \rm{ \: \: \: \: \: \: \: \: \: \: 10 \: m \: \: \: \: }}} \\{ \boxed { \rm{ \: \: \: \: \: \: 50 \: in \: \: \: \: \: \: \: \: }}}[/tex]
Explanation:
• For first length:
[tex]{ \tt{ 1 \times {10}^{11} \: nm = (1 \times {10}^{11} ) \times {10}^{ - 9} \: m }} \\ \\ { \tt{ = 1 \times {10}^{(11 - 9)} \: m}} \\ \\ { \tt{ = 1 \times {10}^{2} = 100 \: m }}[/tex]
• For second length is 10 m
• For third length
[tex]{ \tt{1 \: mi = 1609 \: m}}[/tex]
• For forth length;
[tex]{ \tt{1 \: in = 0.0254 \: m}} \\ { \tt{50 \: in = (50 \times 0.0254)}} \\ = { \tt{1.27 \: m}}[/tex]
1. Of the following groups of three, the elements whose properties are
most nearly alike are those having atomic numbers
A) 1, 2, and 3
B) 5, 13, 31
C) 5, 6, and 7
D) 3, 11, and 19
2. Which set of elements is listed in order of increasing metallic
reactivity?
A)Cu, Na, Pb, Sn
B) Sr. Ca, Mg, Be
C) K, Sc, V. Sn
D) B, Al, Ga, In
3. In the periodic table, elements known as metals are
A) in one row
B) in one column
C) on the left side
D) on the right side
4. Of the elements listed below, which element will have the most
vigorous reaction with water?
A) sodium, Na
B) magnesium, Mg
C) potassium, K
D) cesium, Cs
Answer:
Explanation:
1. D
2. B
3. C
4. A
Music is often used to accompany pictures. What type of music would most likely accompany a photo of a fox chasing a rabbit?
A. Slow, Legato, Major Key
B. Upbeat, Fast, Staccato
C. Slow with Fermatas
D. Long and Flowing phrases
Upbeat, Fast, Staccato type of music would most likely accompany a photo of a fox chasing a rabbit.
Why is music so special?Its language transcends barriers and divisions.
Everyone uses the same language when it comes to music. It is a factor that unites people from all over the world regardless of where they are from and is unaffected by boundaries or prejudices. This would appear that one of our most fundamental instincts is to make music.
Why is music so important and powerful?Science has demonstrated that music has a significant impact on the brain. According to recent studies, music can benefit the brain in a variety of ways, including by reducing pain, reducing stress, improving memory, and healing brain injuries.
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Option B , Upbeat, Fast, Staccato type of music would most likely accompany a photo of a fox chasing a rabbit.
Why is music so important and powerful?
Science has demonstrated that music has a significant impact on the brain. According to recent studies, music can benefit the brain in a variety of ways, including by reducing pain, reducing stress, improving memory, and healing brain injuries. So, music is so important and powerful.
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What is the molarity of a solution containing 4.2 mol of NaCl and a volume of 2.3 L?
The molarity of a solution containing 4.2 mol of NaCl and a volume of 2.3 L is 1.9 M
The molarity is the number of moles of solute per litre of solution.
n=4.2
V=2.3 L
M=n/V
M=4.2/2.3
[tex]M=1.82[/tex]
Molarity is ≅1.9 M
Molarity or molar concentration is the number of moles of solute per liter of solution.Molar concentration can be used to convert between the mass or moles of solute and the volume of the solution.Molarity is represented by M, which is termed as molar. One molar is the molarity of a solution where one gram of solute is dissolved in a liter of solution. Since the solvent and solute combine to create a solution in a solution, the total volume of the solution is measured.To learn more about molarity visit:
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A drinking glass has a mass of 268.5 g. A 162 mL sample of milk is added to the glass. The mass of the glass containing the milk is found to be 436.2 g. What is the density of the milk?
The density of milk is equal to 1.04g/mL when its volume is 162 mL and its actual mass is 167.7 g.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
According to the question,
The actual mass of milk = 436.28g - 268.58g = 167.7 g.
The volume of milk = 162 mL.
The formula for calculating the density is as follows:
Density = Mass/Volume.= 167.7 g/162 mL= 1.04g/mL.
Therefore, the density of milk is equal to 1.04g/mL when its volume is 162 mL and its actual mass is 167.7 g.
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A glass dropper delivers liquid so that 25 drops equal 1.00 mL. How many milliliters are in 37 drops?
Which statement about trend lines is true?
Responses
a. A trend line shows the general pattern of the data, but does not try to connect all the data points.
b. A trend line connects the x-axis and y-axis.
c. A trend line connects all points drawn on the graph.
d. Trend lines are used instead of points.
"A" is the correct answer!
The statement stating that a trend line shows shows the general pattern of data but does not connect all points is true.
What are the characteristics of a trend line?The characteristics of a trend line are as follows:
1) It must be explained mathematically-It should support the observations through the mathematical calculations.
2)It must be self-proving-It should be self-explanatory for it's origin.
3)It should be able to make the data look linear.
4)It should be a curved line when the data fluctuates.
5)It should be a visual representation of data.
6)It denotes the overall direction of the data.
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A 10g metallic block measures has a volume of 5 cm^3. What is the density of the metallic block in g/cm^3
A 10g metallic block measures has a volume of 5 cm^3. The density of the metallic block in g/cm^3 is 2gm/cm^3. The density of a metallic block is calculated by p=m/v
What, for example, is density?Its density is the amount of "stuff" that can be packed into a given amount of space. A block of the tougher, lighter element gold (Au), for example, will have a higher density than a block of the heavier element lead (Pb).
Calculation of the density of the above problem.The density of a substance is given by the following formula:~
ρ = m/v
where the respective alphabets stands for
ρ is the density
m is the mass
V is the volume
by replacing in formula :
p = 10(gm)/5cm^3
p = 2gm/cm^3
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A model rocket has a mass of 0.2 kg, with a motor that can provide a force of 100 N. A second model rocket is being built with
the same motor, but it is being designed to accelerate half as much as the first rocket. What kind of change can be made in
the design to achieve this objective? (1 point)
O The mass of the second rocket should be 0.2 kg."
O The mass of the second rocket should be 0.01 kg.
O The mass of the second rocket should be 0.1 kg.
O The mass of the second rocket should be 0.4 kg.
A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.
Mass of first rocket m1 = 0.2 kg
force of first rocket F1 = 100 N
force of first rocket F1= force of second rocket F2
mass of second rocket m2 = ?
acceleration of first rocket = a1
acceleration of second rocket = a2
Force = mass × acceleration
a1 = F1 / m1 and a2 = F2 / m2
F1 / m1 = F2 / m2
F1 = F2
it is given that acceleration of second rocket is half as much as the first rocket,
therefore,
F1 / 2m1 = F1 / m2
m2 = 2m1
m2 = 2 × 0.2kg
= 0.4kg
Hence,A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.
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Calculate the mass, in grams, of 952 atoms of lithium, Li (1 mol of Li has a mass of 6.94 g).
The atomic number of lithium is 3. 1 mole of li has a mass of 6.94 g.
What is mass?
Mass of the object is defined as anything which occupies space. The atomic number of lithium is 3. 1 mole of lithium has a mass of 6.94 g.
1 mole of atom contains= 6.022 * 10 ^ 23 grams.
952 atom = x
x= 952 * 6.022 * 10^ 23 grams.
x= 5732.94 * 10 ^ 23 grams of lithium
.
Therefore, The atomic number of lithium is 3. 1 mole of li has a mass of 6.94 g.
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This distance-time graph shows the speeds of four toy cars.
Distance (m)
Based on evidence in the graph, which car is the fastest?
The slope of the distance-time graph is used to determine speed. Vehicle A is travelling more quickly because A's slope is greater than B's slope.
How is a speed-time graph drawn?Distance (m) automobile is the fastest according to the data in the graph
A speed-time graph always plots time on the horizontal axis and speed on the vertical axis. This depicts a particle's motion as it increases in speed from a speed of u at time 0 to v at time t.
A speed-time graph demonstrates how a moving object's speed varies over time. The acceleration increases as the graph becomes more pronounced.
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The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant.
The value of equilibrium constant of the second reaction will come as 2.6× 10⁵. It can be calculated from the value of previous equilibrium constant.
Firstly these reactions will be written with reversible arrows, because they are at equilibrium :
H₂(g) + Br₂(g) ⇔ 2 HBr(g)
k₁= 3.8 × 10⁴
2HBr(g)⇔ H₂ (g)+ Br₂ (g)
k₂=?
If we compare the given two reactions , we will find out that second equation is simply reversible reaction of first one .
We know that if we reverse an equilibrium equation, the new equilibrium constant become the reciprocal of the original equilibrium constant.
So, the equilibrium constant of first reaction is K₁= 3.8× 10⁴
Equilibrium constant for second reaction=
k₂= 1/k₁
= 1/ 3.8× 10⁴
=2.6× 10⁻⁵
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Your question is incomplete, for complete question, kindly refer:
The equilibrium constant is given here for one of the reactions below. Determine the value of the missing equilibrium constant in the second reaction.
H₂(g) + Br₂(g) ⇒ 2 HBr(g) k₁= 3.8 × 10⁴
2HBr(g)⇒ H₂ (g)+ Br₂ (g) k₂=?
Which choice is not an example of a molecule?
A) 03
B) Mn
C) KOH
D)H₂S
HELP Can someone do this?
The first law appears to be at conflict with what we typically encounter. According to Newton's first law, any object at rest that is not affected by external forces will stay at rest, and any object in motion that is not affected by external forces will continue moving in a straight path at a constant speed.
The first law of motion in physics states that unless an external force acts upon a body, it will continue to move at its current uniform speed and remain at rest. A ball will exert force on the ground or a wall when it strikes them, respectively. The ground or a wall exerts a reaction force, which causes the ball to bounce back.
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A farmer weighs out 32.0 kg of chicken eggs. What mass of quail eggs would he need to weigh out to have the same number of eggs in both
mass of quail eggs he need to weigh out to have the same number of eggs in both is 2 Kg
Despite being smaller than chicken eggs, quail eggs are heavier in terms of fat, protein, iron, riboflavin, and vitamin B12. They are more difficult to find and more expensive than chicken eggs, though.In this problem we have to find out mass of quail eggs by taking reference to chicken eggs, so this could be example of relative mass theory.mass of standard chicken egg is 37.44g
mass of standard quail egg is 2.34g
Ratio of mass of eggs 16:1
Given,
farmer weighs out 32 Kg of chicken eggs
let x be the mass of the quail eggs he needed
let's calculate mass of quails eggs he needed
1/16 = x/32
x = 2kg
Therefore, mass of quail eggs he needed to weigh out same number of eggs in both is 2kg
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Water hardness is the measure of the concentrations of __________ and __________ dissolved in the water sample.
Answer:
Calcium and Magnesium
Explanation:
Dissolved calcium (Ca++) and magnesium (Mg++) are the only two divalent cations found at appreciable levels in most waters.
I NEED THIS ASAP!! It's not hard science btw. How can polluted stream waters enter groundwater sources? Be sure to use key terms from the lesson in your explanation. HINT: keywords= infiltration, irrigation, point sources, non point sources, etc. (you do NOT need to use all of these! )
Answer:
Poorly Constructed Irrigation Wells
These wells can allow contaminants to enter ground water. Often pesticides and fertilizers are applied in the immediate vicinity of wells on agricultural land.
Some wells rely on artificial recharge to increase the amount of water
infiltrating an aquifer, often using water from storm runoff, irrigation, industrial processes, or treated sewage. In several cases, this practice has resulted in increased concentrations of nitrates, metals, microbes, or synthetic chemicals in the water.
Explanation:
Why does water freeze at the temp it does in comparison to isopropyl alcohol??
Answer: A hydrogen bonded to an oxygen is more “attractive” than a carbon bonded to an oxygen. So, water molecules are “stickier” than ethanol molecules – making it easier for water molecules to get “stuck”.
Explanation:
Who created the airbag a engineer or scientist or both?
Calculate the number of atoms of silver in 3.53g of silver.
A solution is made by dissolving 38.750 g of sample of an unknown, non-electrolyte compound in water. The mass of the solution is exactly 500.0 g. The boiling point of this solution is 100.220 °C.
What is the molecular weight of the unknown compound?
The molecular weight of the unknown compound will come as 0.42 g/mol. It can be calculated as follows:
Given,
mass of sample (solute) (wb) = 38.750g
mass of solution = 500 = mass solute + mass solvent
Here solute (b) unknown non electrolyte compound
solvent (a) is water
Molecular mass of unknown compound (mb)
= mol solute/Kg solvent (nb /wa)
Boiling point=
ΔT = K×mb
= 100.220°C×
≅ 373.22 K
Since
K water = 1.86 K.Kg/mol
Mb = ? (Mol wt ) (wb/nb)
Mb = ΔT / K
Mb = (373.22 K) / (1.86 K.Kg/mol)
Mb = 200.656 mol/Kg
Mass solvent = 500.0 g - 38.750 g
= 461.25 g
= 0.461 Kg
No of moles of solute=
nb = (200.656 mol/ Kg)×(0.461 Kg)
= 92.2 mol solute
Molecular weight
Mb = (38.750 g)/(92.2mol)
= 0.42 g/ mol
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