Answer:
2300J
Explanation:
1 kilojoule is 1000joules so to get how much is 2.3 multiply it with 1000
If your answer is a measurement, it is not correct unless _____. A)it is converted to an SI unit of measurement B)all the units have cancelled out C)you have checked your answer with your teacher D)it includes the proper units along with the numbers E)it is rounded off to the second decimal place
Answer:
A) it is converted to an SI unit of measurement
Explanation:
The SI, System International units are the fundamental units used to measure the scientific quantities.
Example of SI units are Kilogram (km) for distance, liter (l) for liquid, centimeter (cm), and meter (m) for size of the object or short distance etcetera.
SI units help to differentiate quantities from each other and without using SI unit, no one can identify the category of the quantity whether it is distance, size or volume.
Hence, the correct answer is "A) it is converted to an SI unit of measurement".
this is a quiz 6. Relate the sizes of the three subatomic particles to more tangible everyday objects. A= 7. What particles contain most of the mass of an atom? A= 8. What is in between the nucleus and the electrons? A= 9. What is the density of the nucleus? A= 10. How does this density compare with the density of water? A= 11. What is the most basic unit of matter? A= 12. Inside the most basic unit of matter, there are three different particles. What are they and how are they different from each other? A= 13. What are the three particles’ charges? A= 14. Which particles make up the nucleus of the atom? A= 15. The atom is made up of mostly ____________________________________. 16. What is the definition of an element? A= 17. What makes one element different from another element? A= 18. How many protons, neutrons, and electrons are in Carbon, Hydrogen, Oxygen, and Neon. A= 19. What is an isotope? A=
Answer:
677
Explanation:
1. Justin usually blows his nose using Kleenex tissues. His snot keeps leaking through the tissue. He decided he is going to create an experiment to find out if there is something better. What is his dependent variable?
Answer:
His snot.
Explanation:
Because a dependent variable is a variable (often denoted by y ) whose value depends on that of another, and a example is test scores, those are a dependent variable. And it's his snot because his snot keeps leaking and hes going to create an experiment to see if he can solve it.
The dependent variable of Justin's experiment is the mass of the snot the tissue can hold.
What are variables?A variable can be described as an alphabet that can be used to represent an unknown number. Variable generally represents the value. A variable can be described as a quantity that can be changed according to the given mathematical problem.
The dependent variable can be defined as a variable that will depend on the value of some other number. The dependent variable is also defined as the output of a function. If the value of the dependent variable will change therefore there is a change in the value of the respective independent variable.
The independent variable of the experiment will not depend on the values of other variables and is known as the input of a function. The value of the independent variable will not affect by any values of a variable.
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Question 3 0
A student has a lg sample of each of the following compounds: NaCl, Br, and KCL. Which of the following lists the samples in order of increasing number of moles in the sample?
Answer:
Option D. KBr < KCl < NaCl
Explanation:
We'll begin by calculating the number of mole of each sample.
This can be obtained as follow:
For NaCl:
Mass = 1 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mole of NaCl =?
Mole = mass /Molar mass
Mole of NaCl = 1/58.5
Mole of NaCl = 0.0171 mole
For Kbr:
Mass = 1 g
Molar mass of KBr = 39 + 80 = 119 g/mol
Mole of KBr =?
Mole = mass /Molar mass
Mole of KBr = 1/119
Mole of KBr = 0.0084 mole
For KCl:
Mass = 1 g
Molar mass of KCl = 39 + 35.5 = 74.5 g/mol
Mole of KCl =?
Mole = mass /Molar mass
Mole of KCl = 1/74.5
Mole of KCl = 0.0134 mole
Summary
Sample >>>>>>>> Number of mole
NaCl >>>>>>>>>> 0.0171
KBr >>>>>>>>>>> 0.0084
KCl >>>>>>>>>>> 0.0134
Arranging the number of mole of the sampl in increasing order, we have:
KBr < KCl < NaCl
What physical changes occured while you ate breaskfast?
What chemical changes occured while you ate breakfast?
Answer:
Now eating can change food both physically and chemically. Once your spit touches the food chemicals in the saliva begin to change the food chemically.
Explanation:
Answer: It made you not hungry anymore and filled you up. It also helped your brain be more focused.
Explanation:
A physical change is a change that doesn't create a new substance or change the substance. Usually this involves a size or shape change. ... A chemical change is a change that creates a new substance or changes the substance. Usually, this involves color change, temperature change, and/or a new substance being formed.
hope this help luv
Gerry is looking at salt under a powerful microscope and notices a crystalline structure. What can be known about
the salt sample that Gerry is looking at?
Answer:
The atoms are vibrating in place.
Explanation:
One of the properties of an ionic substance is the possession of a crystalline structure. As Gerry observed the salt under a microscope, he discovered that it has a crystalline structure. Crystalline salts are all ionic in nature, hence the salt observed by Gerry is an ionic salt.
Solids containing a definite crystalline structure always has their particles vibrating in place. This is immediately evident as Gerry looks at the salt through a microscope.
Answer:
D.The atoms are vibrating in place
Explanation:
Which of the following is closest in meaning to the word “hypothesis”?
Fact
Law Formula
Suggested explanation
Conclusion
Answer:
suggested explanation
Explanation:
a hypothesis is like a guess to a question. then you test the guess.
The closest meaning of the word “hypothesis” is the suggested explanation. The correct option is C.
What is a hypothesis?
A hypothesis is a theory that is made by seeing a thing and explaining a description of that thing. A hypothesis must be testable according to the scientific method for it to be considered a scientific hypothesis.
Scientific hypotheses are typically based on prior observations that cannot be adequately explained by the current body of knowledge. To make a hypothesis, there is a proper observation.
The proposed explanation is a good example of a hypothesis. Because before making a hypothesis, there is a submitted explanation that will be used in proving the test.
Thus, the correct option is C. Suggested explanation regarding hypothesis.
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Two positively charged particles are first brought close together and then released. Once released, the repulsion between particles causes them to move away from each other. (a) This is an example of potential energy being converted into what form of energy? (b) Does the potential energy of the two particles prior to release increase or decrease as the distance between them is increased.
Answer:
(a) Kinetic energy.
(b) The potential energy between the two particles will decrease as they move away from each other.
Explanation:
(a)The question seems to imply that the two particles were not moving before they were released. In that case, both particles will have a kinetic energy of zero.
However, once the two particles are released and start to move away from each other, their speed increases. That corresponds to an increase in their kinetic energies. As these particles move away from each other, their kinetic energy continues to increase. Note that electrical repulsion is the force that accelerated the two particles. Therefore, conclude that the (electrical) potential energy of the two particles is converted to kinetic energy.
(b)Let [tex]q_1[/tex] and [tex]q_2[/tex] denote the charge on the two particles. Let [tex]r[/tex] denote the distance between them. Assume that the sizes of these two particles are much smaller than the distance between them. Let [tex]k[/tex] represent the Coulomb Constant. The size of the electrical potential energy between the two particles would be:
[tex]\displaystyle E = \frac{k\, q_1\, q_2}{r}[/tex],
Based on these assumptions, the size of the electrical potential energy between the two particles is inversely proportional to the distance between them. Increasing the distance between the two particles would reduce the size of the electrical potential energy.
What is OXIDATION, BREATHING and RESPIRATION?
Answer:
Oxidation: The combustion of food and releasing energy in the presence of oxygen is called oxidation. Breathing: The process of taking oxygen and throwing carbon dioxide is called breathing. Respiration: The process of burning of food taken by organisms in the body to release energy is called respiration.####
Answer:
These are the answers:.
[tex]OXIDATION-[/tex] is the loss of electrons during a reaction by a molecule, atom or iron.[tex]BREATHING-[/tex] this is involves moving air in and out of the lungs for gas exchange with our environment taking in oxygen and bringing out carbon dioxide.[tex]RESPIRATION-[/tex] movement of oxygen from outside to cells and the transport of carbon dioxide in opposite direction.Explanation:
Respiration has many meanings.
Hope it helps.
calculate and compare the chemical energy of coal to its gravitational potential energy. Burning 1 kg of coal releases about 3 million joules of energy. if you could use all of the chemical energy to lift another kilogram of coal, how could you lift it?
Answer:
Explanation:
1 kg of coal releases 3 million joules of energy
energy released = 3 x 10⁶ Joules
This energy will be in the form of chemical energy .
This energy is being used ti lift 1 kg of coal . Let height attained be h .
Gravitational potential energy of coal at height h = mgh where m is mass of the coal , g is gravitational acceleration .
chemical energy = gravitational energy
mgh = 3 x 10⁶
1 x 10 x h = 3 x 10⁶
h = 3 x 10⁵ m
= 300 x 10³ m
= 300 km .
so , 1 kg coal can be lifted by 300 km .
help me please it's important
a
In 25 words or fewer, what is the scientific question for the boiling
water experiment?
Answer: Does adding salt to water make the water boil faster that if salt is not added?
Explanation:
The scientific question for the boiling water experiment could be: "What is the effect of increasing temperature on the boiling point of water?"
This question aims to investigate how temperature influences the boiling point of water. By conducting the experiment and analyzing the results, scientists can gain a better understanding of the relationship between temperature and the physical state change of water from liquid to vapor.
The question focuses on a specific variable (temperature) and its impact on the boiling process, allowing for a targeted investigation and potential insights into the behavior of water under different conditions.
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Each cell has a membrane. This is a thin layer that surrounds it. It keeps the inside and outside of the cell separate. What does the word "surrounds" mean? A fully supports B stands alone C pulls apart D totally covers
Answer:
D
Explanation:
Cell membrane, also called plasma membrane, thin membrane that surrounds every living cell, delimiting the cell from the environment around it.
Convert 1750042 to scientific notation.
Explanation:
Answer is above.. 1.750042* 10 race to 6
What effect did the new study have on scientists' ideas about the way Earth's water formed? (A) Scientists are convinced that Earth mostly got the hydrogen for its water from other nearby planets that have water. (B) Scientists believe the solar nebula may have provided an extra source of hydrogen that helped water form on Earth. (C) Scientists are questioning whether asteroids even hit the Earth and helped it form the water on it. (D) Scientists are concerned that they will never learn the true cause behind the formation of water on Earth.
Answer: (C) Scientists are questioning whether asteroids even hit the Earth and helped it form the water on it.
Explanation:
The scientists are collecting evidence for the fact that the earth's water is the product of the gas left due to the formation of the sun and the asteroidal material. The fact finding inquiry related to this matter has also arose many questions related to the development of the other planets on the solar system and their potential to sustain or support life.
Hence, based on the above information, option C. is correct.
At 27 C
and one atmospheric pressure, a gas has volume V. what will be its volume at 177 C
and a pressure of
1.5 atmosphere?
Explanation:
According to Charles Law :
[tex] \frac{V_1}{T_1} = \frac{V_2}{T_2} [/tex]
[tex] \frac{V}{27} = \frac{1.5}{177} [/tex]
[tex]V = 0.22 \: atm[/tex]
To create an ion you simply need to add or take away an electron true or false
Answer:
True
Explanation:
ion: an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Ions are formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells. When they lose electrons, they become positively charged and are named cations. When they gain electrons, they are negatively charged and are named anions.
The atmospheric pressure on a mountain is 550 mmHg and 1
atm is equal to 760 mmHg. What is the pressure in atm? Give
your answer to 2 significant figures.
Answer:
0.72
Explanation:
if 760=1
550=x
=550÷760= 0.72 in two s.f
The atmospheric pressure of the mountain will be 0.723 atm
What is atmospheric pressure?
Air is everywhere around us at due to which it touches all the surfaces due to which they possess some pressure this exerted pressure is known as atmospheric pressure which can be calculated with this formula.
1 atm = 760 mmHg
1 mmHg = 0.00131 atmosphere
Substituting the value of 1 atm in the given equation,
1mmHg = 0.00131 atmosphere
550 mmHg = 0.00131
= 550 × 0.00131
= 0.723 A T M
It is the total force exerted by the atmosphere as AIR has small molecules and every molecule is possessing some weight as when they are in bulk they form layers these layers.
As we go above on the earth the atmospheric pressure will drops due to the increase in the altitude of the earth due to which there will be less amount of oxygen.
Therefore, the pressure will be 0.723 atm.
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Each of five students used the same ruler to measure the length of the same pencil. These data resulted: 15.33 cm, 15.34 cm, 15.33 cm, 15.33 cm, 15.34 cm. The actual length of the pencil was 15.85 cm. Describe whether accuracy and precision are each good or poor for these measurements.
Answer:
Precision is good but accuracy is poor
Explanation:
The precision in a measure is about how close is a measured value to each other. In the problem, all measurements are between 15.33 and 15.34cm. Thus, you can say precision is good
And accuracy is about how close are the measured values to the theoretical or real value. The real length of the pencil is 15.85cm. The measurements are not even close of the real value. For that reason, you can sat accuracy of the measurements is poor.
The precision was good while the accuracy was poor. Precision is defined
as how close measurements are with each other.
We were told the data from the measurement was between 15.33cm-
15.34cm which shows how close the measurements are hence having a
good precision.
The accuracy is defined as how close a measurement is to the theoretical
or actual value. In this case, the actual value is 15.85cm which is far from the
values gotten from measurements hence signifying the accuracy was poor.
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Which statement provides a reason why a scientific theory could change? * 1 point O scientists repeat the experiments associated with the theory O scientists find new evidence that does not fit the theory O the theory is published in a scientific journal O the theory is over 100 years old
Answer:
B. Experiments test the scientists' ideas.
Explanation:
Experiments helps scientist test the ideas.
Experiment is simply an act of performing a controlled test about an idea.
Before an experiment is made, observations using senses must be deduced from the environment at first.
Observations leads to the formulation of hypothesis.
Hypothesis are more or less a scientific predictions.
Most hypothesis presents variables that can be tested.
The test of a hypothesis is an experiment.
Experiments help us makes controlled test about a scientific observation in a laboratory.
The second option!
I hope this helps!
the atomic number of an atom is the number of ____ in that atom.
Answer:
Protons
Explanation:
Bromine has 35 protons and is number 35 for example
Which of the following appliances increase CFC's in the atmosphere?
(2 Points)
A.Refrigerators
B.Microwave ovens
C.Washing machines
D.Televisions
Answer:
Television cause it has a satellite
if a solid becomes a liquid you must add energy. what is this process called?
Answer:
latent heat, also called the heat of vaporization, is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure. The energy required to melt a solid to a liquid is called the heat of fusion, and the heat of sublimation is the energy....................
Choose the correct answer to complete the paragraph about the acceptance of the heliocentric model. In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included . For centuries, this was the accepted model. During the Renaissance, Nicholas discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the .
Answer:
the first blank is epicycle.
the second blank is Copernicus
the third blank is earth
In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included epicycles. For centuries, this was the accepted model. During the Renaissance, Nicholas Copernicus discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the Earth.
What is Heliocentric Model?The heliocentric theory of the Solar System (aka, the heliocentric model) is a theory that places the Sun at the center of the Solar System. It also maintains that the Earth revolves around the Sun.
This theory was first proposed by Nicolaus Copernicus.
Copernicus was the first to propose a theory which differed from Ptolemy's Geocentric System, according to which the earth is at rest in the center with the rest of the planets revolving around it. The claim that all planets revolve around the sun had been raised in ancient times, but Copernicus was the first to succeed in describing the movements of the planets using an astronomical theory which placed the sun at the center.
Therefore, In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included epicycles. For centuries, this was the accepted model. During the Renaissance, Nicholas Copernicus discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the Earth.
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Can someone name an element that doesn’t match its abbreviation?
Answer:
Gold, silver and sodium.
Explanation:
Gold, silver and sodium are the name of the elements which does not match to their abbreviation. It is because those names are comes from other language. For example, the symbol of sodium is Na which comes from Natrium that is a Latin word. The symbol of gold is Au which comes from Aurum that is also a Latin word. The symbol of silver is Ag which comes from a Latin word i. e. Argentum.
Help please 20points
Answer:
D
Explanation:
D is the answer because this is the only one having to do with genetics. Fox's genetics changed because it's environment changed.
What makes a substance pure?
Answer: When a substance is pure, it is composed of one type of molecule. For example, table salt is only composed of (more or less) salt molecules, while seawater has water and salt molecules. A more complicated example of a non - pure substance is soil. It has many different types of nutrients and compounds.
Answer:
Something that contains only one kind of matter. This can either be one single element or one single compound, but every sample of this substance that you examine must contain exactly the same thing with a fixed, definite set of properties.
What is the most dense a marble(2,56), quartz (2.64), or diamond (3.52).
Complete Question
What is the most dense a marble(2.56), quartz (2.64), or diamond (3.52).
Answer:
Diamond with a density of 3.52
Explanation:
When we say an object is dense, this means how heavy a substance or object can be.
Density can be defined as the mass per unit volume of an object of an object or a substance.
In the above question, we were given 3 substances or compounds with their respective densities:
marble(2.56)
quartz (2.64)
diamond (3.52).
We are asked to find the one that is most dense. This means we are to find the one with the highest density.
From amongst the three compounds, the most dense is Diamond with a density of 3.52.
3. Which of the following best describes the difference in the results of mitosis and
meiosis?
a. Mitosis results in daughter cells with a
complete set of genes. Meiosis
results in daughter cells with half the
genes.
b. Mitosis results in four daughter cells.
Meiosis results in only two daughter
cells.
c. Mitosis produces results in only a few
seconds. Meiosis produces results in
several hours.
d. Mitosis results in daughter cells with a
cell membrane. Meiosis results in
daughter cells with a cell wall.
4
Seycells have
Answer:
A
Explanation:
Mitosis makes 2 daughter cells so you know the answer is not b
water is a compound not a mixture , even thought it contains hydrogen and oxygen. how can u prove that this is a correct statement
Answer:
Hence, water is a compound because it can only be separated into hydrogen and oxygen atom by chemical reaction.A compound forms whenever two or more atoms form chemical bonds with each other. The chemical formula for water is H2O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms. Thus, water is a compound.
Explanation: