Answers
Answer:
b and C
Explanation:
Related Questions
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?
Answers
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
Answers
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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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
Answers
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
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.
Answers
Answer:
All are correct
Explanation:
Which of the following is NOT classified as matter?
rock
B.
steam
C.
air
D.
light
Answers
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density? Answer in g/mL.
Answers
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
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.
Answers
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.
Which organelle breaks down materials and releases energy into the cell?
Answers
Answer:
Nucleus
Explanation:
Explain why volume is an example of an extensive property and density an intensive property.
Answers
Extensive property is dependent on mass. Intensive property is property that depends only on the type of matter rather than the amount. Hense, Volume is an example of Extensive property and Density is an example of Intensive property.
Hope this helps :)
Which of the following phases of matter gives off light?
A. Liquid B. Plasma
C. Gas
D. Solid
Answers
Answer:
b.plasma
Explanation:
they jump in a exited energy level and by doing that they give off light
Answer:
b
Explanation:
its plasma
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?
Answers
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.
What happens to the charge of the atom if one electron is removed
Answers
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.
List 5 biotic factors inside of a classroom
Answers
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.
Answers
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:
4. Anything that has mass and takes up space is an
example of
A. energy
B. chemical change
C. matter
D. temperature
Answers
Answer:
Explanation:
C. matter.
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
Answers
Answer:
true
Explanation:
please help asap !!!!
identify the values that should be tested to see if a change occurs
x - values
y - values
z - values
h - values
Answers
Answer:
I think that it is A. x - values
why don't we estimate an additional number on an electrical balance?
Answers
2.
Reflect polygon P using line l.
P
Answers
What is 7.008 x 10^6 in standard form?
Answers
Answer:10
6
=
1000000
or a 1 with 6 zeroes.
Explanation:So
5
⋅
10
6
=
5000000
or five million.
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
Answers
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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What's 1.02 x 10^2 in standard notation?
Answers
Because the exponent in the 10s term is positive move the decimal point 4 places to the right:
1.2 ×104 =12,000
Identify the pictures that contain molecules.
Answers
the one that contains molecule's is the tope one
Really hope this helped :)
Answer:
the answer I sthe first one .
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
Answers
Answer:
65.8 miles
Explanation:
why is it important to know what things are made of
Answers
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 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
Answers
Answer:
D
Explanation:
i think option D
hope this helps
Answer:
D) nocturnal activity
Explanation:
edge 2020
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.
Answers
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
Answers
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.
How many sig figs does 0.00002 have?
Answers
Which of the following is NOT a chemical of life? Mineral, water, nucleic acid, carbohydrate
Answers
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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