Answer:
6.67 %
Explanation:
Given that,
Measured height of a small lamp, l = 32 cm
Actual height, l' = 30 cm
We need to find the percent error of the student's measurement. Percent error is given by :
[tex]\%=\dfrac{|l-l'|}{l'}\times 100[/tex]
Putting all the values, we get :
[tex]\%=\dfrac{|32-30|}{30}\times 100\\\\\%=\dfrac{2}{30}\times 100\\\\\%=6.67\%[/tex]
So, the percent error of the student's measurement is 6.67 %.
On the periodic table, why are all noble gases placed in column 18 (8A)?
A.Noble gas elements have identical molar masses.
B.Noble gases are all rarer than elements in other columns.
C.The noble gases only chemically react with other noble gases.
D.The valence electron configuration is similar in all noble gas elements.
Answer:
D
Explanation:
In the periodic table the noble gases are place in same column because the valence electron configuration is similar in all noble gas elements. Thus option D is correct.
What is periodic table?A periodic table is defined as an organization of all known elements in increasing atomic number and repeating chemical properties.
It can also be defined as a tabular arrangement of chemical elements ordered by increasing atomic number and element groups.
There are more than 118 elements are arranged in modern periodic table.
Noble gases are defined as any of a class of rare gases that includes helium, neon, argon, krypton, xenon, and, most commonly, radon and display high stability and extremely low reaction rates.
Electronic configuration are defined as the electron configuration around the nucleus of a specific atom or molecule.
Thus, in the periodic table the noble gases are place in same column because the valence electron configuration is similar in all noble gas elements. Thus option D is correct.
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Sound waves move the fastest through which medium?
Answer:
Air/gas
Explanation:
Sound can travel faster through air/gas more effectively than solids or liquids.
Choose all the answers that apply.
What are the habits of mind that a scientist must possess?
creativity
skepticism
artistic ability
reasoning
bias
Answer:
Creativity
Skepticism
Reasoning
Explanation:
Scientists must see a creative way to solve problems in the world. Scientists must also be skeptic about what is said, because if they were not, no one would disagree and the problems would never be solved. Reasoning is a must, as reasoning is involved in the scientific process and writing conclusions to their studies.
Hope this help!
I NEED HELP QUICK Activity:
Part 1: Write all bold vocabulary and define the words (See attached PDF File below). Make sure to number each.
Part 2: Look at the "Second Read of Investigating Landforms On Venus" worksheet (Slide 14) and highlight text to the questions on the worksheet.
Part 3: Answer the questions on the "Second Read of Investigating Landforms On Venus" worksheet: 1) How were the novae on Venus similar to the landforms in Geyra's computer model? AND 2) How did the results of Gerya's model provide evidence for what formed the novae on Venus? (Slide 16)
Part 4: Write the notes: (Slide 19)
3) Scientists can use models to test their ideas and get evidence about processes in the natural world that are difficult to observe.
Exit Slip: How do models help scientists answer questions?
PLEASE HELP ME I WILL MARK AS BRAINLIST.
When we have stomach disorder, we take antacid to solve the problem. How does it help? Support your answer with an equation.
Answer:
idk
Explanation:
Oxygen gas is produced when hydrogen peroxide reacts with manganese
dioxide. How would you identify the oxygen gas? Name the method/test you
would use and explain the details of your observations to confirm the identity of
the gas.
Answer:
method used is decomposition
Explanation:
Hydrogen Peroxide (H2O2) will decompose rapidly in the presence of Manganese Dioxide, acting as the catalyst, to produce Oxygen gas and water.
When the Hydrogen Peroxide and Manganese Dioxide are mixed, Oxygen gas bubbles should be seen coming from the mixture. One can collect this Oxygen gas produced over water (through water-displacement) and store it inside a bottle for later use.
what would happen to the atom calcium if you added 3 protons?
Answer:
Vanadium
Explanation:
Atomic number increases, thereby changing into an atom of Vanadium
Answer:
Vanadium
Explanation:
Science rocks
Convert each of the following lengths to the units requested.
a. 17.3 m to centimeters
b. 2.56 m to kilometers
567 dm to meters
5.13 m to millimeters
Answer:
1730 cm
0.00256 km
5130 mm
Why is imaging the first black hole such an amazing scientific achievement? Explain.
Answer:
The photographic evidence of a long-unseen cosmic force is an extraordinary achievement in science. ... Exciting as it is, the photo actually doesn't capture the black hole itself, nor its interior. Astronomers aimed their telescopes at the event horizon, the invisible boundary thought to surround all black holes
Explanation:
Hope this helps :)
please help me out with this I WILL GIVE BRAINLIEST!!
You have to pick a element corresponding to what the sentence says, like for example it give you three element options and it would say, pick the smallest atom and that element would be the awnser!
Answer:
BE
Explanation:
how do convection currents form ?
Answer:
Convection currents occur when a fluid is near a heat source.
Explanation:
Heat sources provide energy to their surroundings. When fluid receives this energy, molecules inside it move around more, spacing out from each other and lowering the density.
We know from helium balloons that things with lower densities than their surroundings are pushed upwards. Therefore, the fluid close to the heat source moves upwards, as it is hotter than the rest.
As this fluid moves up, cooler molecules drift down, succumbing to gravity.
As hot molecules move up and further from the heat source, they cool down, and drop. As colder molecules drop and move towards the heat source, they heat up, and begin rising.
This results in a circular motion called a convection current. It is present in the strong winds at the seaside and in the magma in the Earth's mantle.
Montrel takes a trip to Central America during the winter. He finds out that the temperature in Central America is about the same year round. Which of the following could explain why?
Options:
A: Central America is near the North Pole.
B: Central America is near the South Pole.
C: Central America is near the equator.
D: Central America is near sea level.
Answer:
C
Explanation
Because My teacher told me that for an example Florida is hot but in Central America is cold or hot and you don’t need a jacket. I don’t remember much
The Central America is near the equator could explain the above statement.
What is equator?Equator is an imaginary line that passes through the centre of the globe at 0 degrees latitude and at equal distance between the North and South Poles.
Some countries of Central America are situated near the equator. The places near equator have little seasonal variation. These places have same amount of daylight and darkness throughout the year and remain warmer year round. These places near the equator have an alternating dry and rainy seasons.
Hence, we can conclude that option C is the answer.
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Which element is a liquid at 1000.K
Answer:
silver?
Explanation:
3. What is SI system? Why has SI system been developed? Give reasons
Which statement best describes how an existing theory is often affected by the development of new technology?
A.) An existing theory is thrown out and replaced with a completely new theory based on the new observations.
B.)An existing theory is modified so that it can explain both the old and new observations.
C.)An existing theory remains the same because a theory is a proven fact that is always true.
D.)An existing theory is kept unchanged while a new theory is developed to explain the new observations.
Answer:
An existing theory is modified so that it can explain both the old and new observations.
Explanation:
The statement which best describes how an existing theory is often affected by the development of new technology is that an existing theory is modified so that it can explain both the old and new observations.
What is a theory?
Theory is defined as a thoughtful explanation which is provided for observations which is constructed using scientific methods.The theory brings together many facts and hypothesis.
It is called as theory as it provides some set of assumptions initially which provide description to the field's approach to the subject.These are elementary theorems of a particular theory.It is a rational type of thinking about a set of observations.
They may be scientific,or non scientific or have no discipline at all.There are three types of theory:1) scientific, 2)philosophical and 3) moral.It provides explanation regarding the underlying mechanisms .
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Diana and Kinsey are put in charge of choosing a mascot for their basketball team. There are fifteen players on the team, but Diana and Kinsey survey only the five players on the starting lineup about their favorite mascot.
Which best describes this error in data collection?
The data are inadequate.
The data are false.
The data were recorded incorrectly.
The data cannot be reproduced.
Answer: the data are inadequate .
Explanation:
If you are given 40 grams of a dye that has a molar mass of 200 g/mole and then place it in 2
liters of water, what is the molarity of the resulting solution?
A2M
B 0.1 M
C 1M
D2M
Answer:
B
Explanation:
to find how many moles we have you need to use the molarity equation which for this is
40g * (1mole/200g) = .2 moles
Given we know that we have .2 moles
then all you have to do is divide amount of moles by amount of liters to find the molarity
for this problem it is
.2mol/2L which is .1 M
What is the difference between mass number and atomic number?
Answer:
They are found the same way but use different symbols when found.
Explanation:
Describe the three mechanisms of heat flow (conduction, convection, and radiation), and the factors that influence their rates.
Answer:
Just as interesting as the effects of heat transfer on a system are the methods by which it occurs. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, as through a cooking pan, or slowly, as through the walls of a picnic ice chest. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet every heat transfer takes place by only three methods:
Conduction is heat transfer through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know that thermal motion of the atoms and molecules occurs at any temperature above absolute zero.) Heat transferred from the burner of a stove through the bottom of a pan to food in the pan is transferred by conduction.
Convection is the heat transfer by the macroscopic movement of a fluid. This type of transfer takes place in a forced-air furnace and in weather systems, for example.
Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of Earth by the Sun. A less obvious example is thermal radiation from the human body.
:)
Further more info...
Conduction:
As you walk barefoot across the living room carpet in a cold house and then step onto the kitchen tile floor, your feet feel colder on the tile. This result is intriguing, since the carpet and tile floor are both at the same temperature. The different sensation is explained by the different rates of heat transfer: The heat loss is faster for skin in contact with the tiles than with the carpet, so the sensation of cold is more intense.
Convection :
In convection, thermal energy is carried by the large-scale flow of matter. It can be divided into two types. In forced convection, the flow is driven by fans, pumps, and the like. A simple example is a fan that blows air past you in hot surroundings and cools you by replacing the air heated by your body with cooler air. A more complicated example is the cooling system of a typical car, in which a pump moves coolant through the radiator and engine to cool the engine and a fan blows air to cool the radiator.
Radiation :
You can feel the heat transfer from the Sun. The space between Earth and the Sun is largely empty, so the Sun warms us without any possibility of heat transfer by convection or conduction. Similarly, you can sometimes tell that the oven is hot without touching its door or looking inside—it may just warm you as you walk by. In these examples, heat is transferred by radiation. That is, the hot body emits electromagnetic waves that are absorbed by the skin. No medium is required for electromagnetic waves to propagate. Different names are used for electromagnetic waves of different wavelengths: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
Animals and Animal-like Protists share some characteristics. Tell how the organisms in these groups are the same? Why do you think scientists have placed them in different groups
Answer/Explanation:
Animals are multicellular heterotrophic organisms, meaning they cannot generate their own food, they rely on external sources of nutrition.
Protists are any eukaryotic organism that cannot be classified as an animal, plant, or fungus. The grouping is more used for convenience than anything else.
Like animals, animal-like protists can move freely and are heterotrophic. However, unlike animals, they are usually unicellular, and much simpler than animals
Now what we've found the volume, let's take a look at the mass. We didn't tare, or zero, the scale before pouring in the fluid. If the value on the scale immediately before pouring in the fluid read 80.1g, what is the mass of the fluid?
A. 86.5 g
B. 246.7 g
C. 116.5 g
Answer:
a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Based on the kinetic molecular theory (KMT), which statement is true?
The particles of matter are do not move.
Matter is composed of very small particles.
The particles of matter have zero kinetic energy.
Matter is made up of only charged particles.
Statement 1 is false because heat is the movement of molecules.
Statement 2 is true because matter is composed of elementary particles which are VERY small.
Statement 3 is false because the kinetic energy of a particle determines its heat and it is impossible for a particle to be completely motionless.
Statement 4 is false because neutrons do not have a charge and make up a large portion of all matter.
please help me quickly
Answer: 2
Explanation:
Answer:
It is two
Explanation:
How would you record the length of an object?
Answer:
a ruler
Explanation:
How cab yout knowledge about solutions help improve health or the quality of life? In what practical way can you use your knowledge about it?
Answer:
Here are possible ways to improve health and quality of life:
-Exercise almost everyday
-Be more positive
-Get rid of bad habits
-Start good habits
-Get new things
-Learn New things
how is plastic made?
Answer:
Cellulose, Coal, Natural Gas, Salt, and Crude Oil
Which of the following correctly describes solid, liquid, and gas states of matter?
Explanation:
In solids, the particles are tightly packed together. In liquids, the particles have more movement, while in gases, they are spread out. Particles in chemistry can be atoms, ions or molecules. It is important to understand the particle nature of matter.
Fill in the blank with either "up" or "down"
a. If the pressure of a gas increases, the temperature will go up
b. If the volume of a gas increases, the pressure will go up
c. If the volume of a gas increases, the temperature will go up
d. If you increase the amount of gas, the pressure will go down
Answer:
a. up
b. down
c. up
d. up
Explanation:
How many atoms are in 0.250 moles of Rb?
Answer:
1.51*10^23 atoms Rb
Explanation:
Use dimensional analysis
How many electrons does chlorine need to obtain a full outer energy level of electrons? A) 1 B) 2 C) 3 D) 4
You just need one to reach full energy. (A)
Only one electrons does chlorine need to obtain a full outer energy level of electrons. Thus, option A is correct.
What is an electron?An electron is defined as a subatomic particle which is charged negatively either bounded to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.
The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
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