Answer: Because hydrogen is a gas.
Explanation: If children were running around with balloons filled with hydrogen gas, then they would catch fire. So the answer to your question is, its simply dangerous.
Which is a good example of a contact force? A. protons in the nucleus of an atom B. a ball falling down after it's thrown up into the air C. a satellite orbiting Earth D. a bat hitting a ball
Answer:
B
Explanation:
Because a ball falling down is a good strong force
Correct Answer:
A ball hitting a bat
The specific heat capacity of aluminum is 0.22 cal/g°C. How much energy needs to flow into 20.0 grams of aluminum to change its temperature by 15°C?
a) 0.017 cal
b) 0.29 cal
c) 66 cal
d) 1363 cal
*I NEED EXPLANATION, PLEASE*
Answer:
C) 66 calories
Explanation:
The Heat energy required to flow into a unit mass object to raise its temperature by 1 degree is known as specific heat capacity.
specific heat capacity of aluminum, c = 0.22 cal/g°C
mass of aluminium, m = 20.0 g
importance of hydrocarbons
Answer:
The most important use of hydrocarbons is for fuel. Gasoline, natural gas, fuel oil, diesel fuel, jet fuel, coal, kerosene, and propane are just some of the commonly used hydrocarbon fuels. Hydrocarbons are also used to make things, including plastics and synthetic fabrics such as polyester.
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
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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What is the volume in cubic centimeters of a 500 mL beaker?
cm3
Answer:
500 cubic centimeters of water (cm3 - cc)
Explanation:
1 milliliter of water (ml) = 1.00 cubic centimeters of water (cm3 - cc)
The volume in cubic centimeters of a 500 mL beaker is 500 cubic centimeters of water (cm3 - cc)
What are measurement units?The two major units used to measure liquid volume are the liter and the milliliter. When measuring huge amounts of liquid, literal is utilized. Furthermore, ml is used to measure very small amounts of liquid.
Measurement units are the units I use to determine the size, number, or quantity of any object.
7 universally accepted basic units of measurement are utilized in daily life. These meters are the units of measurement used to measure distance. Second, used as a unit of measurement of time.
1 milliliter of water (ml) = 1.00 cubic centimeters of water (cm3 - cc).
Therefore, 500 cubic centimeters of water (cm3 - cc).
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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]
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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when an electric kettle containing cold water is switched on, the water in it starts boiling after a few minutes. what is the source of the heat energy of the boiling water?
you have an object with mass of 86 g and volume of 10 cm^3 (cubed). calculate density, show your work, and identify which material you have from the list.
Answer:
8.6g/cm³ (BRASS)
Explanation:
Given the following :
Mass of object = 86g
Volume of object = 10cm³
The density of an object is calculated using the formula :
Density(g/cm³) = mass(g) / volume(cm³)
Inputting our values :
Density = 86g / 10cm³
Density = 8.6g/cm³
According to the table provided, the object which corresponds to having a density of 8.6g/cm³ is BRASS
1. The density of the material is 8.6 g/cm³.
2. The material is brass
Density is simply defined as the mass per unit volume of a substance i.e
Density = mass / volume 1. Determination of the density of the materialThe density of the material can be obtained as shown below
Mass = 86 g
Volume = 10 cm³
Density =?Density = mass / volume
Density = 86 / 10
Density = 8.6 g/cm³Therefore, the density of the material is 8.6 g/cm³
2. Determination of the material.From the calculation made above, the density of the material is 8.6 g/cm³.
Comparing the density of the material (i.e 8.6 g/cm³) with those
given in the table from the question, we can conclude that the
material is brass.
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3) What is the weight of the ethyl alcohol that exactly fills a
200.0 mL container? The density of ethyl alcohol is 0.789
g/mL.
Answer:
158g
Explanation:
To calculate the "weight" (mass) of ethyl alcohol, we have to use this formula:
- Density will have units of gmL when dealing with a liquid or units of gcm3 when dealing with a solid.
The mass has units of grams, g.
The volume will have units of mL or cm3
We are given the density and volume, both of which have good units so all we have to do is rearrange the equation to solve for the mass:
density×volume=massvolume×volume
Density×Volume = Mass
0.789gmL×200.0mL
Thus, ethyl alcohol weighs 158g.
2-11 Ozone molecules are constantly formed and destroyed in the atmosphere. A
picture (cartoon) showing how ozone
molecules are formed is shown below.
0-0
2
A family member of yours who has never studied about this tries to understand
the cartoon pictures but is unable to understand it. He knows that there are no
such living forms in atmosphere but he is not able to understand names like 0,02
and O, and also the
process explained.
How would you explain it to that family member? State in your own words.
Answer:
The diagram shows oxygen, O₂, which consists of two atoms of oxygen in the stratosphere, which are the two beings holding hands, forming a couple being broken up by the intense ultraviolet radiation of the Sun, such that the couple closest to the Sun are the ones that were broken into two O, atoms.
After being broken, the two beings (oxygen atoms), become free to move as they please, making them able to move faster than when they were still a couple. However, due to the likeness for their fellow beings, each of the single O beings rushed to meet the other two still coupled O₂ beings, whereby one O being rushing to meet one O₂ couple each, to form O₃ which is a new group consisting of three beings holding hands known as Ozone
Note, that O stands for atomic oxygen gas
O₂ stands for oxygen gas
O₃ stands for ozone gas
Explanation:
In an atom, what is the number of profons equal
to?
Answer:
The atomic number
Find 3.2458+1.221+4.45
Answer:
8.9168 is the answer..
Round each of the following measurements to the number of significant figures
indicated.
67,029 to three significant figures
0.15 to one significant figure
52.8005 to five significant figures
3.17497 to three significant figures
Answer:
a) 67000 b) 0.20 c) 52.8010 d) 3.17000
Explanation:
your welcome :)
a) 67000 b) 0.20 c) 52.8010 d) 3.17000 are the answers respectively.
What is measurement?Distance is a physical quantity which is measured in meter. If a man travel then it is measured in meters that defines that how much he travel from one point to another point for all these type of things we use to measure distance.
Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance.
Kilometer is also a physical quantity which use to measure the distance 1 kilometer is equal to 1000 mtr and 1 kilometer is equal to 100000 centimeter.
For above conclusion, we easily states that the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance. Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.
Therefore, a) 67000 b) 0.20 c) 52.8010 d) 3.17000 are the answers respectively.
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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.
Put 6.93 x 10^5 into standard notation.
Answer:
693000
Explanation:
Multiplying anything by 10 must follow the base 10 system rules.
That means we can simply move the decimal 5 places to the right.
6.93 x 10⁵ = 693000
My answer to the question is 693000.
Question 3 (1 point)
What are the best units for a scientist to measure the distance between cities?
A. miles
B.inches
C.meters
D.kilometers
Answer: A and D
Explanation: Miles and Kilometers are the best units when measuring distances between cities, this is because both units will in most cases give a reasonable representation of the distance being measured by giving an output which isn't too large or extremely small. Feets and inches are usually adopted when measuring length of objects which in most cases are small and average only a few meters. Meters are also used for measuring short and medium distances. However, representing distances between two cities in terms of inches or feets will usually give extremely large values. Hence, the need for a fairly larger unit in miles or kilometers.
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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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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Which has more kinds of specialized cells, a tissue or an organ?
Answer:
An organ would have more kinds of specialized cells because it is made up of different tissues.
What is the mass of a sample of iron that has had 300.0 j applied to it and heats up from 20.0 degrees Celsius to 40.0 degrees Celsius.. the specific heat of iron is 0.46j/gC
Answer:
The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.
Explanation:
Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.
The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.
The sensible heat in a constant pressure is calculated by:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)
In this case:
Q= 300 Jc= 0.46 [tex]\frac{J}{g*C}[/tex]m= ?Tfinal= 40 CTinitial= 20 CReplacing:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* (40 - 20) C
Solving:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* 20 C
[tex]m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}[/tex]
m= 32.61 g
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.
when salt is dissolved in water the result is a
Answer:
Water molecules pull the sodium and chloride ions apart
Explanation:
NEED HELP with 7. 8. 9. 10. 11. 12. And 14 !!
Answer:
1. 0.00040 calories
2. 8.57 calories
3. 0.196 calories
4. 68 calories
5. 243 calories
6. 83680 joules
7. 1,054,368 joules
8. 2.45 calories
9. 556 (it says calories to calories so it wouldn't change)
10. 28367.52 joules
11. 59.6 calories
12. 449.6 joules
13. 0.00234 calories
14. 23292.328 joules
15. 22877693.6 joules
Hope this helps!
Explanation:
Use the periodic table to select the element that best fits each of the following descriptions.
Alkali metal:
aluminum
calcium
lithium
Answer:
Lithium
Explanation:
Using the periodic table, the selection of the element that best fits the following descriptions is lithium. The correct option is D.
What is a periodic table?A periodic table is a table that contains chemical elements in it. It is a tabular structure that displays elements according to their characteristics. It is used in chemistry and physics.
Lithium is an element that is present in the first row of the periodic table. The first row is called the alkali metals. Its atomic number is 3, and it is white and silvery.
Alkali metals are called alkali because they form alkalies reacting with water. Like lithium hydroxide. They are very strong bases. They are very reactive.
Thus, the correct option is D. lithium.
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12. What is the mass, if the density is 2 and the volume is 6? *
3
O 12
O 15
A model of an atom shows eight electrons in rings that represent different energy levels. How many electrons are in each energy level? A.four in the first energy level, four in the second energy level. B.zero in the first energy level, eight in the second energy level C.two in the first energy level, six in the second energy level D.eight in the first energy level, zero in the second energy level
Answer:
The correct option is;
C. Two in the first energy level, six in the second energy level
Explanation:
The electrons in an atom are arrange in orbital shells which are situated at different levels within the structure of the, depending on the energy of the electron. Electrons with the least amount of energy are found in the shell closest to the nucleus of the atom which is the first energy level
The maximum number of electrons that can be found in a given an energy level is obtained with the following formula;
The number of electron = 2 × n²
Where;
n = The number of the different energy level
Therefore;
The maximum number of electrons in the first energy where n = 1 is given as follows;
The number of electron = 2 × 1² = 2 electrons
The maximum number of electrons in the second energy level where n = 2 is given as follows;
The number of electron = 2 × 2² = 8 electrons
Given that there are only 8 electrons in the atom, we therefore have, 2 electrons in the first energy level and the remaining 8 - 2 = 6 electrons in the second energy level.
Write the correct term: In gaseous substances, the individual molecules are relatively (close/far apart) and are moving freely, rapidly, and randomly.
Answer:
far apart
Explanation:
The molecules of any gaseous compounds are loosely bound and the molecules are far apart from each other. They move freely and rapidly. The inter-molecular forces are lower as compared to a solid or a liquid where the molecules are comparatively closely bound in the compounds.
Because of the large gap or distance between its molecules, gaseous compounds have less density when compared to any solid or liquid.
When you walk up to any substance, you can categorize the substance as a solid, liquid, or gas. You could further categorize the substance as being a pure substance or a mixture, which you wouldn't know without more information. Assuming the substance is pure, what are 3 ways you could report the "amount" of substance in front of you
Answer and Explanation:
In Chemistry, the quantity or amount of a pure substance is given by:
mass (in grams)Volume (in millilitres or litres)Moles (mol)Inter-conversion of units is allowed based on defined units and constituent of the substance.
I believe this explanation would be helpful and easy to follow.