The data collected is not precise.
In science, we define precision as the degree to which scientific measurements yield results having close range of values.
A precise data set has values that are very close to each other.
In this case the values; 4mi/hr, 3mi/hr, 6.9mi/hr, and 7mi/hr are not close to each other.
Therefore, the data set is not precise.
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How would you properly measure the mass of a liquid explain thoroughly
Answer:
Weigh a beaker or glass with the liquid then subtract the result from the beaker
Explanation:
beaker weight + liquid weight = mass of container
mass of container - beaker weight= liquid weight
This is similar to the law of conservation of mass
hope that helps :)
Which two features are used to describe matter?
om
Answer:
Physical properties are used to observe and describe matter. Physical properties can be observed or measured without changing the composition of matter. These are properties such as mass, weight, volume, and density.
When a metal such as copper is heated,it expands. Can anyone tell me what happens to the metal particles as the solid metal expands?
Answer:
The metal molecules inside start to vibrate faster, causing the solid to change to liquid if exposed to the intense temperature over a long period of time.
Explanation:
As my answer states, but for an explanation, lets say you are boiling an ice cube, it will start to turn into liquid water, that is because it has been exposed to that heat for a long period of time. The same will happen for the metal, if its exposed for long enough, it will turn into a liquid, then can be turned into a gas because the molecules are vibrating so quickly that they start to easily move apart.
Hope this helps, let me know if any more clarification is needed.
Questi Which two methods do scientists use to gather information? O A. Observing the natural world OB. Following religious beliefs C. Expressing strong opinions D. Carrying out investigations SUBM
Answer:
A and D
Explanation:
Observation
Experimentation
Models
Analysis of existing data
Where in Africa could you find a valley glacier?
Answer:
you can find Valley Glacier in Mount Kenya
which of the following pair has a larger size? a)K or K- b)Br or Br- c)O2- or F- d) Li or Na
Answer:
jabvVbbnndbznnsnsksloplshebxbsnejxjevdjdjwjsjxbsjwpzbrjsjdndn
Explanation:
zusbejdnd.d
shsjsksosbejzjdhdbdjedhd
dudbskwjxbdbdjsijednjzhenejd3jdbvfbsj
susjdjksuwhwudnjwibdghejdooejejdhdbbsndjl2lekkw
Bohr's model of the atom included a positively charged _____ orbited by negatively charged _____.
neutrons, electrons
electrons, protons
nucleus, protons
nucleus, electrons
How can we regain the hardness of water by adding lime?
Answer:
Softening - In water softening, hydrated lime is used to remove carbonate "hardness" from the water. Hardness caused by other calcium and magnesium salts, called noncarbonate hardness, is generally treated by means of the lime-soda process, which entails the precipitation of magnesium by lime.
A sample of a pure substance is found to have a mass of 52.11 g. Water in the graduated cylinder has a volume of 12.5 mL. When the substance is placed in the water, it sinks and the volume of water and substance now reads 31.8 mL. What is the density?
Density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it is expressed as:
[tex]Density = \frac{Mass}{Volume }[/tex]
With the above formula, we can obtain the density of the substace given in question as illustrated below:
Step 1Data obtained from the question
Mass = 52.11 g.
Volume of water = 12.5 mL.
Volume of water + Subtance = 31.8 mL
Density =? Step 2Determination of the volume of the substance
Volume of water = 12.5 mL.
Volume of water + Subtance = 31.8 mL
Volume of substance =?Volume of substance = (Volume of water + Subtance) – (Volume of water)
Volume of substance = 31.8 – 12.5
Volume of substance = 19.3 mL Step 3Determination of the density of the substance
Mass of substance = 52.11 g.
Volume of substance = 19.3 mL
Density =?[tex]Density = \frac{Mass}{Volume } \\\\Density = \frac{52.11 }{19.3}[/tex]
Density = 2.7 g/mLTherefore, the density of the substance is 2.7 g/mL
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Identify one instance each of kinetic energy and potential energy
Answer:
Few Examples of Kinetic Energy
The following are typical examples of kinetic energy:
A wrecking ball used to demolish a building through utilization of the kinetic energy it possesses in motion.
Conversion of liquid water to steam, by virtue of the fast movement of the molecules of the liquid upon agitation
A golf ball after being struck off the tee
An asteroid falling towards Earth at incredible speed
A downhill skier traveling down a hill
The flow of a river
An airplane in motion (possesses a tremendous amount of kinetic energy. This is because the mass of the airplane and the velocity at which it moves are enormous)
Explanation:
Answer:
"The battery in the car has potential energy in the form of chemical energy. As the car is turned on and moves, this potential energy becomes kinetic energy."
Explanation:
Remember to change it up a bit.
Lavoisier made an important contribution to chemistry by _____.
developing the atomic theory of matter
developing the law of conservation of matter
developing the law of multiple proportions
coining the term "atom"
Answer:
developing the atomic theory of matter
Explanation:
what is the mass 2 moles of urea
Answer:
60.06 g/mol
The solute is urea, CO(NH2)2. Molar mass of urea: (12.01) + 16.00 + 2(14.01 + 2(1.008)) = 60.06 g/mol.
Explanation:
please mark me brainliestAnswer:
60.06 g/mol
Explanation:
the solution area,CO(NH2)2.molar mass urea:
(12.01)+16.00+2(14.01+2(1.008))=60.06g/mol
the process by which charged plasma particles
revert back to a gas
Answer:
Plasma, in physics, an electrically conducting medium in which there are roughly equal numbers of positively and negatively charged particles, produced when the atoms in a gas become ionized. It is sometimes referred to as the fourth state of matter, distinct from the solid, liquid, and gaseous states.
A student carrying a glass cup trips and drops the glass, then it shatters.
What type of change is this?
A. Physical change
B. Chemical change
C. Mixture change
(Need explanation too)
Answer:
A
Explanation:
Answer:
A is the correct answer I believe
HELP NOW ASAP‼️ Find the temperature, in Kelvin, that will dissolve 400 g of sugar in 100 g of water.
Answer:
hot
Explanation:
how do isotopes of a given element differ?
Answer:
they have different mass numbers
Explanation:
When sodium reacts with Iron(II)and chloride iron metal and sodium chloride are formed what are the coefficient used in this reaction?
You have a 9.1 ppm sodium ion (Na', 22.990 g/mol) aqueous solution. Express this in uM (umol/L).
The concentration of 9.1 parts per million of sodium in the solution is equal to 395.8 μM (molarity).
A ppm (parts per million) and M (molarity) are units of concentration. To convert ppm to μM we need to remember that:
[tex] 1 ppm = \frac{mg}{L} [/tex]
[tex] 1 M = \frac{mol}{L} [/tex]
Molar mass Na = 22.990 g/mol
Now, we can convert ppm to M as follows:
[tex][Na^{+}] = 9.1 \frac{mg}{L}*\frac{1 g}{1000 mg}*\frac{1 mol}{22.990 g}*\frac{10^{6} \mu mol}{1 mol} = 395.8 \mu mol/L[/tex]
Therefore, the concentration of sodium in the solution is 395.8 μmol/L.
You can see another example of ppm conversion to molarity here: https://brainly.com/question/13565240?referrer=searchResults
I hope it helps you!
Why does magnesium chloride need to be molten in electrolysis
Answer:
this is from another brainliest answers.
Explanation:
Ionic compounds need to be molten or in solution for electrolysis to work. This is because the charged particles that make them up (ions) need to be free to move to the electrodes.
What did Ernest Rutherford’s gold foil experiment demonstrate about an atom?
Each atom is composed of electrons and positive material.
The mass of the atom is evenly spread throughout the atom.
Neutrons are located in the center of the atom.
Positive charge occupies a very small volume in the atom.
Answer:
I believe its the last one
Explanation:
The gold-foil experiment showed that the atom consists of a small, massive, positively charged nucleus with the negatively charged electrons being at a great distance from the centre. Niels Bohr built upon Rutherford's model to make his own.
WILL GIVE OUT BRAINLY
Which atom would be neutral?
1. An oxygen atom with 16 electrons, 18 protons, and 16 neutrons
2. An oxygen atom with 4 electrons, 6protons, and 4 neutrons
3. An oxygen atom with 8 electrons, 8 protons, and 9 neutrons
4. An oxygen atom with 9 electrons, 8 protons, and 8 neutrons
Answer:
3 is the answer
Explanation:
as the number of electrons =number of protons
so the negatively charged particles= positively charged particles
1. Based on the data set and the true measured value being 28km.
A. Is this data accurate, precise, or both?
B. What is the average?
29km
28.3km
28.2km
27.22km
28.1257km
28km
27.8km
28.6km
28km
27.777777777km
Thank you!
Which gas law states that the volume of gas is directly proportional to its temperature
Answer: Charles' Law
Explanation: At constant pressure, Charles's law states that the volume of a given amount of gas is directly proportional to its temperature on the kelvin scale. [0 Kelvin = 0 Liters gas]
Explanation:
. Charles’s law—named for J.-A.-C. Charles (1746–1823)—states that, at constant pressure, the volume V of a gas is directly proportional to its absolute (Kelvin) temperature T, or V/T = k.
1. Name 3 elements that are found in the same family/group
Answer:
Lithium, Hydrogen, Sodium, or Oxygen, Sulfur, Selenium They are all in the same column. Find three elements in the same family and list them. 4. Oxygen, Carbon, Nitrogen, Aluminum, Silicon, Phosphorous They are all in the same row
Explanation:
What was the central goal of the author(s) of the Declaration of Independence?
A.
to announce to world leaders that the 13 colonies had formed the United States
B.
to define and describe the rights of the citizens living in the new country
C.
to establish rules for the creation of new states that wanted to join the new country
D.
to communicate their grievances to the British king about how he treated them
Answer:
D. to communicate their grievances to the British king about how he treated them
I just took the test and said this was the correct answer.
The central goal of the author(s) of the Declaration of Independence is to communicate their grievances to the British king about how he treated them. The correct option is D.
What is the Declaration of Independence?The declaration of independence tells three main ideas. These ideas are all men are equal, and everyone should get equal rights, liberties, and the pursuit of happiness. The main aim of the government should be to protect the rights of the people.
The main goal of the declaration of independence is to tell that energy human is equal, and that should not be discriminated don the basis of caste or gender. They should gate the liberty of doing and going anything and anywhere, respectively.
Thus, the D. communicated their grievances to the British king about how he treated them.
To learn more about the Declaration of Independence, refer to the link:
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Could any one help on this fill in questions
hello!, can you please answer these
Answer:
Sunflower- The common sunflower (H. annuus) is an annual herb with a rough hairy stem 1–4.5 metres (3–15 feet) high and broad, coarsely toothed, rough leaves 7.5–30 cm (3–12 inches) long arranged in spirals. The attractive heads of flowers are 7.5–15 cm wide in wild specimens and often 30 cm or more in cultivated types.
(70 POINTS) PLEASE HELP ME YOU DONT HAVE TO WRITE 4 PARAGRAPHS JUST HRLP ME EXPLAIN A SCIENTIFIC THERORY
Choose a scientific theory and describe the theory. You will describe the theory in 2-to-4 well-written paragraphs. Who developed the theory? How did the scientist come up with the theory? Has the theory
changed over time? How has the theory impacted scientific thinking? Explain an experiment you could run to
test the theory, including the design and execution, and any observations you can make of the world around you related to the scientific theory. How do these observations support or refute the theory?
Answer:
well its def is : an explanation of observations or events based on knowledge gained from many observations and investigations
Explanation:
Sugar is added to iced tea and the contents are stirred until all of the sugar dissolves. How would the tea now be classified?
A. It is a solution
B. It is an element. C. It is a compound D. It is a pure substance
advantages and disadvantages of chemistry
Answer:
Advantages of chemistry:-
•Basic knowledge of chemistry helps you to read and understand product labels.
•Chemistry can help you make informed decisions.
•Chemistry is at the heart of cooking. ...
•A command of chemistry can help keep you safe!
Disadvantages of chemistry:-
•It isn't a sustainable form of energy. ...
•It can be expensive.
•It can produce harmful waste.
•It can be used to create devastating weapons.
