Answer:
its 459 L
Explanation:
Which statement correctly describes hydrogen bonds? Which statement correctly describes hydrogen bonds? They hold together adjacent water molecules. They form when opposite charges repel each other. They happen only between water molecules. They form between the hydrogen atoms of different water molecules.
Answer:
They form between the hydrogen atoms of different water molecules.
Explanation:
A hydrogen bond is always a dipole-dipole bond. It is an attraction between a slightly positive atom of a molecule with the negative atom of the another molecule containing hydrogen. Thus, in a water molecule, oxygen atom will attract the electrons in the O–H bonds. Its interaction always involves a hydrogen atom.
They form between the hydrogen atoms of different water molecules is the correct statement about hydrogen bonds.
A hydrogen bond refers to a kind of bond that occurs from the attraction between a hydrogen atom and a negatively charged oxygen, fluorine, or nitrogen atom.
This attraction, for its part, is known as a dipole-dipole interaction and links the positive pole of one molecule with the negative pole of another.
Oxygen is very electronegative, that is, it attracts electrons from the bond much more strongly than hydrogen.This dipole-dipole interaction between water molecules is known as hydrogen bond.Water molecules can form hydrogen bonds with other molecules.Therefore, we can conclude that they form between the hydrogen atoms of different water molecules is the correct statement about hydrogen bonds.
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How much force is needed to accelerate a 66 kg skier at 2 m/sec2
Answer:
132N
Explanation:
F=ma
F=66×2
F=132N
The answer is 132 N
The parameters given in the question are;
mass= 66 kg
acceleration= 2m/s
Therefore the force can be calculated as follows;
F= mass × acceleration
= 66 × 2
= 132
Hence the force needed is 132 N
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Materials expand when heated. Consider a metal rod of length L0 at temperature T0. If the temperature is changed by an amount ΔT, then the rod’s length changes by ΔL=αL0ΔT, where α is the thermal expansion coefficient.
For steel, α=1.24×10−5∘C−1.(a) A steel rod has length L0=40cm at T0=40∘C. What is its length at T=180∘C?
(Use decimal notation. Give your answer to three decimal places.)
L≈cm
(b) Find its length at T=90∘C if its length at T0=120∘C is 65 in.
(Use decimal notation. Give your answer to three decimal places.)
L≈ in.
(c) Express length L as a function of T and α if L0=60in. at T0=150∘C.
(Use symbolic notation and fractions where needed.) L(T,α)=
Answer:
(a) The length at temperature 180°C is 40.070 cm
(b) The length at temperature 90°C is 64.976 inches
(c) L(T, α) = 60·α·T - 9000·α + 60
Explanation:
(a) The given parameters are
The thermal expansion coefficient, α for steel = 1.24 × 10⁻⁵/°C
The initial length of the steel L₀ = 40 cm
The initial temperature, t₀ = 40°C
The length at temperature 180°C = L
Therefore, from the given relation, for change in length, ΔL, we have;
ΔL = α × L₀ × ΔT
The amount the temperature changed ΔT = 180°C - 40°C = 140°C
Therefore, the change in length, ΔL, is found as follows;
ΔL = α × L₀ × ΔT = 1.24 × 10⁻⁵/°C × 40 × 140°C = 0.07 cm
Therefore, L = L₀ + ΔL = 40 + 0.07 = 40.07 cm
The length at temperature 180°C = 40.07 cm
(b) Given that the length at T = 120°C is 65 in., we have;
The temperature at which the new length is sought = 90°C
The amount the temperature changed ΔT = 90°C - 120°C = -30°C
ΔL = α × L₀ × ΔT = 1.24 × 10⁻⁵/°C × 65 × -30°C = -0.024375 inches
The length, L at 90°C is therefore, L = L₀ + ΔL = 65 - 0.024375 = 64.976 in.
The length at temperature 90°C = 64.976 inches
(c) L = L₀ + ΔL = L₀ + α × L₀ × ΔT = L₀ + α × L₀ × (T - T₀)
Therefore;
L = 60 + α × 60 × (T - 150°C)
L = 60 + α × 60 × T - 9000 × α
L(T, α) = 60·α·T - 9000·α + 60
3. Complete the following conversions.
a. 10.5g=__kg
b. 1.57 km = ___m
c. 3.54 ug = ___g
d. 3.5 mol=___umol
e. 1.2 L = ___mL
f. 358 cm = ____m3
g. 548.6 ml. =____cmii
Answer:
a. 0.0105
b. 1.570
c. 0.00000354
d. 35,000,000
e. 1200
f. 0.000358
g. 548.6
The complete conversion of the given examples are as follows:
a. 10.5g = 0.00105 kg
b. 1.57 km = 1570 m
c. 3.54 ug = 3.54 × 10⁻⁵ g
d. 3.5 mol = 3.5 × 10⁶ umol
e. 1.2 L = 1200 mL
f. 358 cm = 3.58 × 10⁻⁴ m³
g. 548.6 ml = 548.6 cm
Conversion is a multi-stage procedure, which requires a numerical factor to multiply or divide and the appropriate selection of a number of important digits.
Using the International System Units for Conversions Factors.
(a)
If 1 g = 0.001 kg
∴
10.5 g will be:
[tex]\mathsf{= \dfrac{10.5 \ g \times 0.0001 \ kg}{1 \ g}}[/tex]
= 0.00105 kg
(b)
If 1 km = 1000 m
1.57 km will be:
[tex]\mathsf{= \dfrac{1.57 \ km \times 1000\ m}{1 \ km} }[/tex]
= 1570 m
(c)
If 1 ug = 1 × 10⁻⁵ g
∴
3.54 ug will be:
[tex]\mathsf{= \dfrac{3.54 \mu g \times 1 \times 10^{-5} \ g }{1 \ \mu g}}[/tex]
= 3.54 × 10⁻⁵ g
(d)
If 1 mol = 10⁶ umol
∴
3.5 mol will be:
[tex]\mathsf{= \dfrac{3.5 \ mol \times 10^6 \ u \ mol}{1 \ mol} }[/tex]
= 3.5 × 10⁶ umol
(e)
If 1 L = 1000 mL
∴
1.2 L will be:
[tex]\mathsf{=\dfrac{1.2 \ L \times 1000 \ mL}{1 \ L}}}[/tex]
= 1200 mL
(f)
If 1 cm = 0.000001 m³
∴
358 cm will be:
[tex]\mathsf{= \dfrac{358\ cm \times 0.000001 m^3}{1 \ cm}}[/tex]
= 3.58 × 10⁻⁴ m³
(g)
If 1 mL = 1 cm
∴
548.6 mL will also be equivalent to 548.6 cm
Therefore, from the above explanation, we've seen how to convert from one unit to another.
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what’s the name of the compound AgNO3
Answer:
Silver nitrate
Explanation:
When setting up a conversion, where does the initial unit go in the conversion factor?
Answer:
All these conversion factors are equal to 1. If it doesn't seem obvious at first, think about it for a second. Realize that 1 minute is equivalent to 60 seconds. Simply replace 1 minute in the fraction with its equivalent 60 seconds and it becomes clear that 60 seconds / 60 seconds = 1. Numerator and denominator are equivalent; they are just expressed differently.
Explanation:
The initial unit cancels out and goes into the new unit
In science, we often need to convert from one unit to another to ensure accuracy of our calculations.
Let's say i want to convert 500 minutes to seconds.
The conversion factor is as follows;
60 seconds make 1 minute
x seconds make 500 minutes
x = 60 seconds * 500 minutes/1 minute
x = 30,000 seconds
Hence the initial unit which is "minutes" is canceled out and the new unit "seconds" remains.
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Which of the following properties of an unknown substance would allow it to be classified as a mixture? The unknown substance
Answer:
D. has different properties when sampled in different areas.
Explanation:
The general property of a mixture says that each substance or component in a mixture has its individual or different property which can be separated on the basis of different methods.
Such as a mixture of oil and water is a heterogeneous mixture and have different properties or different densities, which helps them to be sampled in different areas.
Hence, the correct answer is "D".
Plz help me out ASAP!!
Conversion : J ➝ Cal
[tex]\bigstar\:\boxed{\bf{\purple{4.2\:Joule=1\:Cal}}}[/tex]
[tex]:\implies\sf\:3.5\times 10^6\:J[/tex]
[tex]:\implies\sf\:3.5\times 10^6\:J\times \dfrac{1\:Cal}{4.2\:J}[/tex]
[tex]:\implies\sf\:0.833\times 10^6\:Cal[/tex]
[tex]:\implies\bf\:8.33\times 10^5\:Cal[/tex]
Control group
Matching
Match the word to the definition Write the letter on the line
6. Scientific inquiry
А. This group shows the effect of the verable beng tested
7 Hypothesis
В. This is the one veriable thet is changed
8
C A welltested expleretion for expermental results
9 Expermertel group
D The many ways in which scientists study the natural world
10
Independent verable E A possible answer to a scientfic question
11
Dependent veriable
F This describes en observedpettern in nature
12 Scientific theory G This group is left alone end not experimented on
12 Scertfic low
H This is the veriable that gets messured
Identithin
Answer:
i also have to do this lol
Explanation:
calculate the speed of a train that is traveling west distances of 100 miles in 2 hours
a. 200m/h
b. 200m/h west
c. 50m/h
d. 50 m/h west
Answer:
d
Explanation:
The train will travel for 2 hours to travel a distance of 100 miles with a speed of 50m/h. Therefore, option (C) is correct.
What is the speed?The speed of a body is defined as the rate of change in the position of a body w.r.t. time.
Speed is a scalar parameter with both magnitude and no direction. A simple mathematical formula common way to determine speed.
S = d / t
where S is the speed, d is the distance moved by a body and t is the time.
Although the SI unit for speed is the same as velocity is m/s and can also be expressed in miles per hour (mph), and kilometers per hour (kph).
Given, the distance traveled by train, d = 100 miles
The time taken by train = 2 hrs
The speed of the train = distance/ time = 100/2 = 50m/h
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An ice cube is left on the kitchen counter. After some time, the ice cube melts into a small puddle of water.According to the law of conservation of mass, how does the mass of the puddle of water compare to the mass of the original ice cube
Answer:
Mass of the water is equal to the mass of ice
Explanation:
When ice melts, the mass remains the same even though its volume decreases leading to a decrease in density of water.
The mass remains the same because according to the law of conservation of mass, mass can neither be created nor destroyed. Since mass is neither created nor destroyed in the process of melting, the mass of water must remain the same.
I need help with these questions ASAP!!!
Answer:
a.) figure A.
b.) figure B.
Explanation:
in the physical change the mater stays in the two color groups there is still balance
in chemical change they seperate and break of into matching pairs
The healing of a cut finger. Is it a physical or chemical change? Explain.
Wound healing is a chemical change.
A chemical change involves the formation of a new substance. A substance changes form from one form into another in the process. A physical change does not involve the formation of new substances. Wound healing involves a number of chemical changes.
A wound can also be referred to as a tissue damage. When a tissue is damaged, bleeding results. Bleeding could lead to so much loss of blood.
The human body has mechanisms in place to combat this excessive loss of blood. This occurs when a complex biochemical pathway leads to the formation of fibrinogen. The enzyme thrombin converts fibrinogen to fibrin. The formation of fibrin is very essential to the wound healing process.
We can see that a series of chemical changes are involved in the process of wound healing when your finger is cut.
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HELP ASAP PLEASE
Outline a sample experiment you could set up to investigate the effect of drinking Starbucks on student test scores. List all components in the 2nd objective above.
What is the most important property of Group 0 gases? Elaborate.
Answer:
the group 0 elements, the noble glass. are all unreactive ,non-metal gases . they show trends in their physical properties.
Explanation:
their uses depend on their inertness.
In addition to describing and explaining mental processes and behavior, psychology also attempts to __________ these phenomena. Group of answer choices
Answer:
The correct approach will be "Predict and control ".
Explanation:
Psychology seems to be the study including its thought process as well as behavior. The psychological layouts in this article that the individual requires to understand, feel, and so on, whereas action seems to be how someone behaves. Psychologists as well as physicians speculated about either the relation was seen between the mind and perhaps the nervous system while philosophers struggled to understand the links between the organs.The new element "Leo (L)" has three stable isotopes: L-82 (exact mass: 81.8735), L-85 (exact mass: 84.8322), and L-86
(exact mass: 85.6299). The relative abundances are 64.8%, 18.5%, and 16.7%, respectively. What is the average atomic
mass of element L?
Answer:
83.637562
Explanation:
A bar if soap is 12cm tall 6 cm wide and 10 cm long if has a mass of 415 grams what is the density is
Answer:
density= mass/volume. volume= 12 x 6 x 10. 415/720=.57g/cm^3
Explanation:
Answer: 0.58g/cc density of the Soap.
Explanation:
which light would you predict to produce the greenest plant
Explanation:
The light of the sun is important for green plant to grow
Anyone else getting this
Answer:
yeeehhhhhh
Explanation:
basically my charger doesnt work
Can someone find the independent variable and the dependent variable ?
A model of an atom shows eight electrons in rings that represent different energy levels. How many electrons are in each energy level?
A. zero in the first energy level, eight in the second energy level
B. eight in the first energy level, zero in the second energy level
C. four in the first energy level, four in the second energy level
D. two in the first energy level, six in the second energy level
Answer:
energy level I can hold a maximum of two electrons, and energy level II can hold a maximum of eight electrons. so it must be D
Explanation:
two in the first energy level, six in the second energy level
i took the test already you can go to my quizlet to get study cards for the test
How were the ideas of Aristotle and Democritus similar to the alchemists'?
Answer:
The ideas of Aristotle and Democritus were on a similar basis to the alchemists.
Explanation:
Aristotle believed that all matter was made from four elements: earth, air, fire, and water. Democritus was the first person to realize that if something was cut in half continuously it can never be broken down completely. Democritus called the units that could not be broken down atoms. Early alchemists believed and based their works on the notion that atoms could be rearranged into making new elements. All three of their ideas more or less work with atoms and elements.
Question 3
25 pts
If a can of soup contains 22.0 oz (ounces) of soup, how many grams of soup is that? (1 lb
= 16 oz, 1 lb = 454 g)
330 g
624 g
O 0.0485 g
Answer:
D
Explanation:
D
22/16*454≈624g
624g grams of soup is that, If a can of soup contains 22.0 oz (ounces) of soup. Hence, option C is correct.
What are ounces?1 ounce is equal to 437.5 grains or 28.349 grams.
Given :
A can of soup contains 22.0 oz (ounces) of soup.
16 oz = 1 lb
So, 22.0 oz is equal to [tex]\frac{1 X \;22.0}{16}[/tex]
=1.375 lb
And given that:
1 lb = 454 g
so, 1.375 lb = 1.375 X 454
624.25 =624g
Hence, 624g grams of soup is that, If a can of soup contains 22.0 oz (ounces) of soup.
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What are some real life examples of revolution
Answer:
pick any example
Explanation:
the revolution of the Earth around the Sun
The period of revolution of the Earth around the Sun is equal to one year.
The Earth makes one revolution on its axis in about 24 hours.
This motor operates at a speed of 5,000 revolutions per minute.
An object velocity can be described by I s acceleration and direction
Answer:
Yes.
Explanation:
The proton has a mass of?
Question 7 of 10
A scientist needs to study blood cells for medical research. Why might a
computer model benefit the scientist?
A. Using the model will give more accurate study results.
B. The model would enable the scientist to see what the flow of
blood cells would look like when slowed down.
C. The model can be adjusted until the scientist gets the desired
results.
D. The blood cell is too large to study, and the model is smaller.
SUBMIT
A computer model will benefit a scientist while studying the blood cells for medical research because that would enable the scientist to see how the flow of the blood cells will look like when it is slowed down.
What are blood cells?Our blood contains a number of blood cells which are suspended in a liquid which is known as plasma. Blood cells are the constituents of blood and are of different types like Red blood cells (RBCs), white blood cells (WBCs), Platelets etc. Plasma contains about 92% water and the most abundant solutes present in it are the plasma proteins and they include globulins, albumins etc.
Computer models help us to observe blood and its components and can provide us more insights and observation into the blood flow as we are able to slow it down as per our convenience.
Hence, option B is the correct answer.
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What is true of neutrons?
Sam is making an aquaponics garden. He needs 2.3 dkg of granite. He has 460 g. How much more does he need? Explain your answer with your work.
Explanation:
He needs 2.3 dkg
dkg is a unit of mass and represents dekagrams.
The relationship between dkg and g is given as;
1 dkg = 10g
This means he needs 2.3 * 10 = 23 g of graphite.
Since he already has 460g of graphite, he doesn't need any additional graphite.