When determining the number of significant digits in a measurement,
a.
all zeros are significant.
b.
all nonzero digits are significant.
c.
all zeros between two nonzero digits are not significant.
d.
all nonzero digits are not significant.

Answers

Answer 1
All zeros are significant

Related Questions

Calculate the wavelength of radiation with a frequency of 8.0 x 10^14 Hz.

Answers

Wavelength = speed divided by frequency

The wavelength of radiation with a frequency of [tex]8.0 \times 10^{14} Hz[/tex] is 375 nm, calculated using the relationship between wavelength, frequency, and the speed of light [tex](3.00 \times 10^8 m/s)[/tex].

To calculate the wavelength of radiation with a given frequency, we can use the formula that relates wavelength, frequency, and the speed of light:

[tex]\(\lambda = \frac{c}{f}[/tex]

The speed of light (c) in a vacuum is approximately [tex]3.00 \times 10^8[/tex] meters per second (m/s).

Given the frequency (f) of [tex]8.0 \times 10^{14} Hz[/tex], we can calculate the wavelength by substituting these values into the equation:

[tex]\(\lambda = \frac{3.00 \times 10^8 m/s}{8.0 \times 10^{14} Hz}[/tex]

Now, let's perform the calculation:

[tex]\(\lambda = \frac{3.00 \times 10^8}{8.0 \times 10^{14}} meters[/tex]

[tex]\(\lambda = 3.75 \times 10^{-7} \left meters, \left or \left 375 nm[/tex]

So, the wavelength of radiation with a frequency of [tex]8.0 \times 10^{14} Hz[/tex] Hz is 375 nm.

Given the chemical reaction Fe3O4 + H2 ⟶ Fe + H2O, identify the coefficient of H2O in the balanced equation.

1
2
6
4

Answers

Answer: The coefficient of [tex]H_2O[/tex] in the balanced chemical equation is 4.

Explanation:

Every balanced chemical equation follows Law of conservation of mass.

This law states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another form. This also means that the total number of individual atoms on the reactant side will be equal to the total number of individual atoms on the product side.

For the given balanced chemical equation:

[tex]Fe_3O_4+4H_2\rightarrow 3Fe+4H_2O[/tex]

The coefficient of [tex]H_2O[/tex] in the balanced chemical equation is 4.

Final answer:

The coefficient of H2O in the balanced chemical equation Fe3O4 + H2 ⟶ Fe + H2O is 4.

Explanation:

The coefficient of

2

H

2

O in a chemical equation represents the number of water molecules involved in the reaction. It's the number written in front of

2

H

2

O to balance the equation in terms of mass and charge.

The student asked about the coefficient of H2O in the balanced equation Fe3O4 + H2 → Fe + H2O. When balancing this equation, we must ensure that the number of atoms of each element is equal on both sides of the reaction. Balancing iron (Fe) and oxygen (O) first, we find that the balanced equation is Fe3O4 + 4H2 → 3Fe + 4H2O. So, the coefficient of H2O in the balanced equation is 4.

Is the 3 in a molecule a coefficient,subscript, or element 3H2O2

Answers

The 3 is the coefficient, the element is H for Hydrogen and 202 is the subscript!

Predict what might happen if the human body did not have specialized cells, tissues, organs, and organ systems to maintain homeostasis

Answers

We would be dead. No heart, brain or blood flow 
The body would be unable to maintain homeostasis because the cells of the body would have too many jobs to do. The cells likely would not be able to do all of these jobs.
It wouldn't be able to live because the organ system helps you breath.
The specialisation of cells is paramount to having a functional multicellular organism.
If the body didn't specialise then it wouldn't be an organism; it would just be a colony of cells much like those that bacteria and other single celled organisms form.


Hope this helps.

the control rods are made of what materials

Answers

a rod of a neutron-absorbing substance used to vary the output power of a nuclear reactor.

How much energy, in kilocalories, is in the clam chowder?

Answers

Final answer:

The energy in clam chowder is measured in kilocalories (kcal or nutritional Calories), which is part of its nutritional information. The actual amount varies depending on specific recipe or brand.

Explanation:

The amount of energy, specifically the caloric content, in clam chowder or any other food, is typically detailed in the food's nutritional information. In terms of dietary consumption, energy is usually given in terms of Calories (note the capital 'C'), also known as nutritional calories or kilocalories (kcal). One nutritional Calorie is equal to 1 kcal, or 1000 basic chemistry calories (cal) - this is approximately the amount of energy required to heat 1 kg of water by 1 °C.

However, without specific nutritional information about the particular clam chowder in question, we can't give a specific kcal value. The calories in clam chowder can significantly vary depending on the specific recipe or brand, including variables such as the presence and amount of different ingredients like cream, clams, potatoes, etc.

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Which item is made from a basic ingredient? Soap Tea Wine Vinegar

Answers

Answer is: soap.

Soap is a salt of a fatty acid and alkaline (basic) solution.  An alkaline solution induces saponification of triglyceride fats into salts of fatty acids.

Toilet soap has sodium and potassim cations.  Metallic soap have magnesium and calcium cations.

Sodium soaps, made from sodium hydroxide are firm and potassium soaps, made from potassium hydroxide, are softer or often liquid.

Answer:

soap

Explanation:

im just tryna get them coins sis...

Describe the structure of the beryllium atom.

Answers

Atoms consist of electrons surrounding a nucleus that contains protons and neutrons. Neutrons are neutral, but protons and electrons are electrically charged. Protons have a relative charge of +1, while electrons have a relative charge of -1. The number of protons in an atom is called its atomic number.

The beryllium atom, with an atomic number of 4, has a total of four protons and electrons, with two electrons in both the 1s and 2s orbitals. It has two valence electrons in the 2s orbital and can form molecular compounds like beryllium hydride (BeH2) by making two single covalent bonds.

The structure of a beryllium atom can be described by its position as the first element of Group 2 in the periodic table, with an atomic number of 4. This number represents the amount of protons in the nucleus and also the electrons surrounding the nucleus since the atom is electrically neutral. Beryllium's electron configuration includes two inner shell (1s) electrons and two outer shell (2s) electrons, with both shells being s orbitals. Thus, the outermost shell holds the two valence electrons in the 2s orbital.

As a result, the electron dot diagram for beryllium resembles that of helium, with a pair of dots representing the two valence electrons. When forming compounds, such as gaseous beryllium hydride (BeH2), beryllium is capable of making two single covalent bonds, as its small size and comparatively higher ionization energy lead to the formation of molecular rather than ionic compounds. Despite its capacity to form covalent bonds, beryllium typically does not achieve a complete octet in its bonding behavior.

What does object A do when it acts as a transmitter?

Answers

Final answer:

When an object acts as a transmitter, it emits electromagnetic waves produced by vibrating charged particles. These waves, carrying energy and information, can induce a current in a receiver like an antenna which can be tuned to detect a specific frequency.

Explanation:

When object A acts as a transmitter, it emits electromagnetic waves, such as radio waves. These electromagnetic waves are produced by vibrating charged particles, and propagate outward from the transmitter. This is similar to how a standing wave on a guitar string distributes sound.

For example, in radio transmission, these waves create a feeble current in a conductor such as an antenna. The current or signal in the antenna is then amplified in a radio receiver until it is strong enough to measure or record. The receivers can be tuned to select a single frequency channel, in much the same way as you would tune your television or radio. In advanced applications such as astronomy, more sophisticated data-processing techniques are used to detect thousands of separate frequency bands simultaneously.

In summary, a transmitter such as object A produces electromagnetic waves that carry energy and information from one place to another.


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Water is composed of the same element as hydrogen Peroxide. how do the properties compare

Answers

Both water and hydrogen peroxide are made up of oxygen and hydrogen but in different proportions. The chemical properties of both compounds differ greatly although they look similar physically. While water is a neutral compound and a necessary ingredient in the biochemical reactions that occur in the body, hydrogen peroxide is a weak acid and a toxic compound in the body. Hydrogen peroxide is denser than water; it is 40% more denser than water. The boiling and the melting point of the compounds also differ.

Which is a sign of a chemical change?

A) Ice cream left at room temperature melts.
B) Calcium chloride is dissolved in H2O and disappears.
C) Paint on a freshly painted wall dries and is no longer sticky.
D)When H2S gas is bubbled into a lead acetate solution, a precipitate forms.

Answers

Final answer:

The correct option that indicates a chemical change is D (When H2S gas is bubbled into a lead acetate solution, a precipitate forms), as a new substance is formed which represents a chemical change.

Explanation:

A sign of a chemical change is typically indicated by a change in composition and/or appearance due to a chemical reaction. Options A, B, and C are examples of physical changes where there’s a change in the state or appearance without a change in the composition. The correct answer is choice D: When H2S gas is bubbled into a lead acetate solution, a precipitate forms. This is an example of a chemical change as a new substance is formed: lead sulphide, which is the precipitate.

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Identical objects are placed in Beaker A and Beaker B. The objects float as shown in the diagram. What can you conclude about the liquid in each of the beakers?

a
Question 6 options:


The liquid in Beaker B has a greater density than the liquid in Beaker A.


The liquid in Beaker A has a greater density than the liquid in Beaker B.


The liquid in Beaker A has a greater density than the objects. The liquid in Beaker B is less dense than the objects.


Both liquids are less dense than the objects.
 
I think the answers are B or D please help me!

Answers

I think it is a but dont take me for it. I searched it and thats what I found since liquid in beaker B is more dense then realtivley speaking the object is less dense compared other liquid and floats at a higher level.
The Answer is A.). 
YEAH YEAH I KNOW I NEED 20 CHARACTERS!
sry Frustrated

According to the kinetic theory, what is the kinetic energy of a gas molecule proportional to?

Answers

it is directly proportional to absolute temperature only.

which model is most likely used to predict a future event

Answers

The model most likely to predict the future event is the model of the weather systems. The model of the weather system provides much crucial information such as the temperature!

Answer:

C The Model of Weather systems

Explanation:

I don't Have a Explanation tho there is another explanation before me.

Does it matter in this problem how many eggs are in a cluckster ?

Answers

what? That docent make any scene?

what is a cells it is my first time to learn science thats why idont know

Answers

“the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.” - dictionary on google

It’s cold outside and you decide to cook some pasta. As you boil the noodles, the kitchen window begins to fog up. Which processes are at work here?

Answers

Final answer:

The processes at work here are evaporation and condensation. When the boiling water molecules gain enough energy to escape the liquid and enter the air as vapor, evaporation occurs. The water vapor then condenses back into liquid form on the cooler window glass, resulting in fog.

Explanation:

The processes at work in this situation are evaporation and condensation.

Evaporation occurs when the boiling water molecules gain enough energy to escape the liquid and enter the air as vapor. This is why the kitchen window fogs up; the water vapor from the boiling noodles comes into contact with the cooler window glass and condenses back into liquid form, forming water droplets that appear as fog.

Condensation is the process by which a gas or vapor changes back into a liquid. In this case, the water vapor condenses on the cold window, which has a lower temperature than the boiling water and causes the vapor to lose energy and revert to its liquid state.

Is mass conserved when 50 g of sugar undergoes a physical change?

Answers

yes, mass never changes. No exceptions.
Actually, mass can change, but it cannot be created nor destroyed, so this means that if sugar goes into a physical change, mass CAN be broken off but CANNOT be destroyed, so your answer is yes mass is conserved. 

why is the periodic table called the periodic table

Answers

The periodic table is named as such as it is split into groups with the same number of electrons in the outer shell. These groups can also be called periods which is where the table gets its name from.

The periodic table is called the periodic table because it repeats. All the elements on the periodic table are arranged by atomic number so the elements repeat. It’s almost like in school when you have switch classes they repeat as well. It’s very fascinating to see all these elements organized it the way that that they are.

what was the name of the start of something new in science?

Answers

i googled it and all it came up for is the Wikipedia for high school musical.
but yeah my personal answer would be: chemistry 

The name of the pivotal moment marking the beginning of a significant transformation in science, often referred to as the "start of something new," is the Scientific Revolution.

This period, which began in the 16th century and continued through the 17th century, laid the foundations for modern science and drastically changed the course of scientific inquiry and thought.

During the Scientific Revolution, there was a shift from qualitative explanations of nature to quantitative and empirical methods. This era saw monumental figures like Nicolaus Copernicus, who proposed a heliocentric model of the solar system; Galileo Galilei, who improved the telescope and provided evidence supporting Copernican theory; Johannes Kepler, who formulated the laws of planetary motion; and Isaac Newton, who developed the laws of motion and universal gravitation. These advancements and many others set the stage for the Age of Enlightenment and the subsequent Industrial Revolution, profoundly impacting the development of technology and the modern world.

A compound is found to be 40.0% carbon, 6.7% hydrogen, and 53.5% oxygen. Its molecular mass is 60. g/mol. What is its molecular formula?

Answers

Carbon=10.0
Hydrogen=6.7
Oxygen=53.5
Next, divide by their atomic masses. The atomic masses of the elements are;
Carbon=12, Hydrogen=1, Oxygen=16
So that will be
Carbon=40/12=3.3
Hydrogen=6.7/1=6.7
Oxygen=53.5/16=3.3
Next, divide by the smallest number. The smallest number is 3.3
Carbon=3.3/3.3=1
Hydrogen=6.7/3.3=2
Oxygen=3.3/3.3=1
So the empirical formula will be
C₁H₂O₁ which is the same as CH₂O
To get the molecular formula;
(CH₂O)n=molecular mass
Now we need to find n
(CH₂O)n=60
Multiply the atomic masses of each by the subscript and add them all
C₁=12 x 1=12
H₂=1 x 2=2
O₁=1 x 16=16
(12+2+16)n=60
(30)n=60
Divide both sides by 30
therefore; n=60/30
n=2
Next, multiply CH₂O by 2
C=1 x 2=2
H₂=2 x 2=4
O=1 x 2=2
So you have the empirical formula to be C₂H₄O₂
Hope that helped. Have a nice day

the elements iron and oxygen can react to form the compound iron oxide. what type of reaction is this? please explain.

Answers

your reaction
.. Fe + O2 ---> FexOy
for this reaction..
.. the Fe on the left is in the 0 oxidation state
.. the Fe on the right is in the +(2y/x) oxidation state
.. the O on the left is in the 0 oxidation state
.. the O on the right is in the -2 oxidation state
meaning
.. the O is reduced... . . (it's reduced in oxidation state)
.. the Fe is oxidized.. . .(oxidation state increased)
this is a REDOX reaction

*********
AND.. it's also a synthesis reaction.. (aka combination reaction)

Answer:

Oxidation reaction

Explanation:

Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons

Which would be best categorized as heat transfer by conduction?
A) Wearing a white shirt to stay cool on a summer day.
B) Cooling a burn on your hand by running your hand under cold water.
C) Feeling the heat from a light bulb with your hand when touching the bulb.
D) Feeling the heat from a light bulb while holding your hand from 6 inches away.

Answers

The answer is C) Feeling the heat from a light bulb with your hand when touching the bulb. :)

Answer: Option (C) is the correct answer.

Explanation:

When two substances or objects are at different temperature and heat from object 1 flows to object 2 when both of them are placed touching each other then this process is known as conduction.

For example, when we touch a light bulb then heat from the bulb flows into the hand.

Thus, we can conclude that out of the given options, feeling the heat from a light bulb with your hand when touching the bulb is best categorized as heat transfer by conduction.

what kind of rays has the highest amount of energy in the EM spectrum?

Answers

Answer:

Gamma rays

Explanation:

Gamma rays have the highest energy,lowest wavelength and highest frequency. On the other hand radio waves have the lowest energy and highest wavelength.

where in the atom are the electrons that are involved in chemical bonding located?

Answers

They are located outside of the cell.
it is located in the nucleus

The s subshell can hold up to two electrons in an atom. True or False

Answers

true but this can vary 
the answer is true. it can only hold up to 2

The milky way has a radius of approximately 50,000 light years. The visible universe has a size of approximately 15 billion light years. If the milky way is represented by an 8 centimeter wide coffee cup, how big would the rest of the universe be in kilometers

Answers


1875000000 Is the answer because you pretty much are being asked to divide so 15 billion divided by 8 is 1,875,000,000. Hope this helps:)

What are all 4 levels of the energy pyramid? HELP ASAP

Answers

ProducerPrimary consumers, Secondary consumers and Tertiary consumers.
I'm writing this in the structure of an actual pyramid.

Tertiary Consumers -- Top of the food chain
Secondary Consumers
Primary Consumers -- This is the start of heterotrophs.
Producers -- Bottom of the food chain, these are the plants/autotrophs.

list 3 machines or devices that depend on gravity to work

Answers

toilet, sink, shower

how do you overcome or reduce the problem of random error and systematic error while doing experiment

Answers

The best way to overcome or reduce the problem of random error and systematic error while doing experiment is to "increase the sample size"
Final answer:

Random errors in experiments can be reduced through increasing the sample size and repeated measurements. For systematic errors, calibration of the instrument, rigorous experimental design and the use of control groups can significantly reduce the errors.

Explanation:

The random and systematic errors in experiments can be significantly reduced using a variety of methods. For random errors, increase the sample size and perform repeated measurements to identify and eliminate outliers, thereby increasing the precision of your results.

To overcome systematic errors, calibration of the measuring device should be done before conducting the experiment to ensure accuracy. Experimental design should be rigorously done which includes controlling the environment to eliminate external factors that may affect measurements. The use of a control group and careful observation during experimental manipulation can also reduce systematic error.

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