Answer:
0.24%
Explanation:
To find the percent error, first subtract the actual value by the expected value. You can ignore the sign of the difference.
42.0 - 42.1 = -0.1 = 0.1
Divide the difference by the expected value and multiply by 100%.
0.1/42.1 = 0.0024 × 100% = 0.24%
The percent error is 0.24%.
A liquid that occupies a volume of 9.0 L has a mass of 7.2 kg. What is the density of the liquid in kg/L
Answer:
Density = 0.8 kg/LExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]From the question
mass = 7.2 kg
volume = 9.0 L
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{7.2}{9} [/tex]We have the final answer as
Density = 0.8 kg/LHope this helps you
True or False? Mixtures always result in a chemical reaction because they consist of two or more substances thus combine to create a new product
Answer:
true
Explanation:
4. Anything that has mass and takes up space is an
example of
A. energy
B. chemical change
C. matter
D. temperature
Answer:
Explanation:
C. matter.
A sample of xenon gas collected at a pressure of 948 mm Hg and a temperature of 283 K has a mass of 128 grams. What is the volume of the sample in Liters?
Answer:
V = 1.84 × 10³ L
Explanation:
You need to use the Ideal Gas Law and solve for volume.
PV = nRT
V = nRT/P
First, you need to convert the pressure to atm.
1 atm = 760 mm Hg
948/760 = 1.247 atm
Next, convert grams of xenon to moles. The molar mass is 131.293 g/mol.
128/131.293 = 0.975 mol
You now have all of the values needed.
P = 1.247 atm
n = 0.975 mol
R = 8.314 J/mol*K
T = 283 K
Plug the values in and solve.
V = nRT/P
V = (0.975 × 8.314 × 283)/1.247
V = 1.84 × 10³ L
The volume of the sample will be 1.84 × 10³ L.
Which of the following is NOT a chemical of life? Mineral, water, nucleic acid, carbohydrate
Answer:minerals
Explanation:
Chemicals are the smallest level of organization that makes the cell. The nucleic acids, water, and carbohydrates are crucial for life, but minerals are not chemicals of life. Thus, option A is correct.
What are biochemicals?Biochemicals are substances that are essential for living things and are also produced inside the cells. Major biochemicals are carbohydrates, nucleic acids, lipids, and proteins. They are made up of various chemicals and elements.
These are the most essential chemicals that are crucial for survival and play an important role in various activities and functions. Minerals are not chemicals involved in life. The various chemicals perform various metabolic and cellular functions.
Thus, option A. minerals are not chemicals of life.
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why don't we estimate an additional number on an electrical balance?
Identify the pictures that contain molecules.
the one that contains molecule's is the tope one
Really hope this helped :)
Answer:
the answer I sthe first one .
1. A teacher asks a student to give the number of protons, neutrons,
and electrons in an atom of fluorine.
a. Is this enough information to answer the question?
b. If it is, determine the number of p, nº, and eʻs.
c. If not, what other information is needed?
What is 7.008 x 10^6 in standard form?
Answer:10
6
=
1000000
or a 1 with 6 zeroes.
Explanation:So
5
⋅
10
6
=
5000000
or five million.
What if we are in a secret alien community and earth is the ghetto so that’s why aliens never visit earth
Answer:
then the cause of Corona is a gas leak
Answer:
Maybe because we have different skin tone we have white, dark, brown or we might not speak the same language as them or look like them they are going to be confused
Explanation:
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density? Answer in g/mL.
Answer:
The answer is
2.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass of aluminum = 40.5 g
volume = 15 mL
Substitute the values into the above formula and solve for the density
We have
[tex]Density = \frac{40.5}{15} [/tex]
We have the final answer as
2.7 g/mLHope this helps you
In an odometer measures the mileage of a car to 1/10, or 0.1, of a mile. Circle the measurement that shows an appropriate level of precision For this odometer.between 60 and 70 miles. 65 miles 65.8 miles. 65.729 miles
Answer:
65.8 miles
Explanation:
What are some ways carbon dioxide enters our atmosphere and subsequently the air we breathe
Answer:
when organisms decompose, or burning fossil fuels and pollution and such
Explanation:
List 5 biotic factors inside of a classroom
Which organelle breaks down materials and releases energy into the cell?
Answer:
Nucleus
Explanation:
why is it important to know what things are made of
Answer:
Explanation:
Knowing what things are made of, especially in the case of a mixture whose constituents still retain there chemical properties, assists in knowing the beneficial and harmful effects of those things.
For a example, a body cream/lotion (a mixture) that contains hydroquinone will give an individual the idea that the body cream is a lightening cream; as hydroquinone is a depigmenting agent that reduces the production of melanin thereby leading to the lightening of the skin.
Another relevant example is the hand sanitizer that is recommended for use of cleaning of hands in order to rid the hands off of corona virus. The recommended hand sanitizer should be made of at least 60% ethanol for effective use (which dissolves the virus). Knowing the components of a sanitizer to be used against the virus will assist an individual at a store make informed decision about purchase.
Which of the following phases of matter gives off light?
A. Liquid B. Plasma
C. Gas
D. Solid
Answer:
b.plasma
Explanation:
they jump in a exited energy level and by doing that they give off light
Answer:
b
Explanation:
its plasma
Explain how the magnitudes of the solute-solute, solvent-solvent, and solute-solvent interactions compared in order to account for the solution formation process being endothermic or exothermic
Answer:
See explanation
Explanation:
Energy is absorbed by solute molecules as the solute-solute interactions are broken in order to make solute-solvent interactions as a solution is formed. The nature of solven-solvent interaction also determines the possibility of a solute-solvent interaction because like dissolves like. Polar substances can only dissolve in polar solvents and nonpolar substances only dissolve in nonpolar solvents.
Therefore, the solution formation process is exothermic if solute-solvent interaction is greater than solute-solute and solvent-solvent interaction.
Similarly, solution formation process is endothermic if the magnitude of solute-solvent interaction is less than the magnitudes of solute-solute and solvent-solvent interaction.
20. What will be the concentration, in mol dm, of the resulting solution when 200 cm' of
0.200 mol dmhydrochloric acid, HCl(aq) are mixed with 300 cm of 0.100
mol dm HCl(aq)?
Answer:
0.140mol/dm^3.
Explanation:
200cm3 = 0.2dm^3.
0.2dm^3 * 0.200mol/dm^3 = 0.040mol
300cm^3 = 0.3dm^3
0.3dm^3 * 0.100mol/dm^3 = 0.030mol
The number of moles is 0.070mol of HCl (aq).
The volume of the solution is 0.5dm^3.
Hence the concentration is 0.140mol/dm^3.
The concentration is 0.140mol/dm³.
What is concentration?The concentration of solution is the amount of solute that are dissolved in solution.The concentration can be measured by dividing the weight of solute in grams to the volume of solution.200cm³ = 0.2dm³
0.2dm³ x 0.200mol/dm³= 0.040mol
300cm³ = 0.3dm³
0.3dm³ x 0.100mol/dm³ = 0.030mol
The number of moles is 0.070mol of HCl
The volume of the solution is 0.5dm³
Concentration = Number of moles/volume in dm³
= 0.070mol/0.5dm³
= 0.140mol/dm³
Hence, the concentration is 0.140mol/dm³
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Which of the following is not an adaptation of California thrashers to life in the chaparral biome? a. a long, curved beak for scratching at the ground b. nesting in late March c. a preference for walking over flying d. nocturnal activity Please select the best answer from the choices provided A B C D
Answer:
D
Explanation:
i think option D
hope this helps
Answer:
D) nocturnal activity
Explanation:
edge 2020
Can somebody please describe in detail the difference between a chemical and physical change/reaction. Please provide examples and do as much as possible if you can. Will reward brainliest.
Answer
A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds
Explanation:
The digit that would have to be estimated in reading this instrument would be the nearest:
A: 0.001 g
B:0.01 g
C: 0.1 g
D: 0.0001 g
Answer:C
Explanation:
.1 is secure
.01 is secure because shows the lines and can line it up.
.001 you can not tell for sure what the last digit it.
The digit that would have to be estimated in the reading given instrument is the nearest 0.1 g. Therefore, option (c) is correct.
What is the uncertainty in the measurements?
Uncertainty means the range of possible values within which the true or actual value of the lies. The term accuracy is commonly used to mean the difference between the actual or true value and a measured result. Since the actual value of a measurement is not known, the accuracy of a measurement is generally not known either.
Uncertainty is almost always to one significant digit. If the uncertainty starts with a one, then sometimes uncertainty to two significant digits. The experimental measurement always rounds to the same decimal place as the uncertainty.
The uncertainties have two components one is bias related to accuracy and the unavoidable random variation that takes place when doing repeated measurements which are related to precision.
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Initially, scientists described atoms as the smallest particles of matter. However smaller particles within atoms were
discovered
How did the scientific world respond to this new information?
O by ignoring the new information because it went against a scientific law
O by discarding the old theory about atoms and making a new one
O by revising the theory that explained atoms to include this new information
by designing new technology that would prove the new information was wrong
Answer:
O by revising the theory that explained atoms to include this new information
by designing new technology that would prove the new information was wrong
Answer:
O by revising the theory that explained atoms to include this new information
by designing new technology that would prove the new information was wrong
Explanation:
The Gateway Arch in St. Louis, MO is approximately 630 ft tall. How many U.S. half dollars would be in a stack of the same height? Each half dollar is 2.15 mm thick.
Answer:
To equal the height of the Gateway Arch in St. Louis, it would take 76810 half dollars.
Explanation:
If the Gateway Arch in St. Louis is 630 feet high, how many half dollars will it take to equal the height if each half dollar is 2.15mm thick?
First, we convert the ft to cm and the cm to mm.
- 1 ft = 30.48 cm
630 ft = 19202.4 cm
- 19202.4 cm = 192024 mm
Now, if a half dollar is 2.15 mm thick, how many half dollars would it take to equal the height of 192024 mm?
1 half dollar = 2.15 mm
X = 192024 mm
X = 192024 mm / 2.15 mm
X = 76810 half dollars.
What happens to the charge of the atom if one electron is removed
Answer:
if it loses an electron, it becomes positively charged
Explanation:
If electrons are removed from an atom, then it has more positive charges than negative ones, and the atom has an overall positive charge. Positive ions are called cations. The sharing or exchanging of electrons is what forms bonds between atoms.
If the gasoline tank in a compact car holds 12.0 US gallons, what is its capacity in liters?
Answer:
45.4249414 or about 45.42 liters
Explanation:
We know the gas tank holds 12 gallons, but we want to find the capacity in liters.
There are 3.785411784 liters in one gallon. Therefore, to convert from gallons to liters, multiply the number of gallons by 3.785411784
liters = 3.785411784 * gallons
The gas tank holds 12 gallons. Plug 12 in.
liters = 3.785411784 * 12
liters = 45.4249414
Let's round to the nearest hundredth. The 4 in the thousandth place tells us to leave the 2 in the tenth place.
liters ≈ 45.42
The capacity in liters is 45.4249414 or about 45.42
Which feature of a hypothesis leads to a new experiment?
a basis on research
a dependency on prior knowledge
a possible explanation
an ability to be tested
Answer:
d
Explanation:
The feature of a hypothesis leads to a new experiment is an ability to be tested and the correct option is option 4.
A hypothesis is a proposed explanation or prediction for a phenomenon or observation. It is a tentative statement that can be tested through experimentation or further investigation.
A hypothesis is typically based on prior knowledge, research, and observations, and it serves as a starting point for scientific inquiry. It is a crucial step in the scientific method and provides a framework for designing experiments to gather evidence and support or refute the hypothesis.
A well-formed hypothesis should be clear, specific, and testable, allowing for the collection of data and analysis to draw conclusions about the validity of the proposed explanation.
Thus, the ideal selection is option 4.
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Which of the following are observations? Select all that apply.
A. Watching table salt dissolve in water.
B. Feeling the sensation of ice held in the hand.
C. Smelling ammonia used in a cleaning solution.
D. Hearing a loud bang when a balloon filled with hydrogen gas is ignited.
E. Looking at the readout of a digital scale when measuring reagents for an experiment.
Answer:
All are correct
Explanation:
PLEASE HELP Wendy and Michelle are trying to determine whether their ideas are scientific or pseudoscientific. Wendy's idea is based on experiments, and new observations can improve it. The experimental results of Michelle's idea cannot be verified.
Which statement is correct about Wendy and Michelle's idea?
Both ideas could be scientific.
Neither idea could be scientific.
Only Wendy's idea could be scientific.
Only Michelle's idea could be scientific.
Answer:
C
Explanation:
All naturally occuring polysaccharide have one terminal residue a free anomeric carbon why do these polysaccharide not give a positive chemical test for reducing sugar
Answer: The concentration of reducing ends is too small to detect.
Explanation:
The reducing sugar can be defined as the sugar that is capable of acting as a reducing agent because it possesses an aldehyde group and a ketone group. Some polysaccharides are reducing sugars but all the monosaccharides are reducing sugars. The polysaccharide with reducing sugars do not give a positive test for reducing sugars because the concentration or amount of reducing ends is too small to detect.