Which of the following DOES NOT have 2 significant
figures?
11,000,000,000
0.11
1.001
0.0000011

Answers

Answer 1

Answer:

1.001

Explanation:

The Significant Figures are 1 0 0 1, This answer has 4 Significant figures, while the other three have only 2 significant figures


Related Questions

Select the correct statement about thermochemical equations from the following: Select one:
a. The specific heat capacity of all substances involved in the chemical reaction are listed to the right of the balanced chemical equation.
b. Because the enthalpy change of the reaction depends on the states of matter of the substances, they must be shown for each substance in the equation.
c. Positive values for the enthalpy change of a reaction indicate that the reaction released energy.
d. If the chemical reaction is reversed, then the arithmetic sign of the change in enthalpy stays the same.

Answers

Answer:

Because the enthalpy change of the reaction depends on the states of matter of the substances, they must be shown for each substance in the equation.

Explanation:

The enthalpy of a substance depends on the particular state of matter in which it occurs.

Therefore, in a thermo chemical equation, all the states of matters for all the chemical species in the equation must be accurately written so that the thermo chemical equation can be meaningful.

The correct statement about thermochemical equations is  the enthalpy

change of the reaction depends on the states of matter of the substances,

they must be shown for each substance in the equation.

Enthalpy is defined as the heat change that occurs in a reaction or the sum

of the internal energy present. It is associated with change in matter and  is

dependent on the physical states of the reactants and products.

This is the reason why the physical states such as solid, liquid, gas etc have

to be shown in a thermochemical equation.

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When a piece of metal mass of 54.52 g is dropped into a graduated cylinder containing 23.44 mL of water, the water level rises to 28.85 mL. What is the density of the metal? Answer in units of g/cm3

Answers

Answer:

Density = 10.01 g/cm³

Explanation:

The density of a substance can be found by using the formula

[tex]Density = \frac{mass}{volume} [/tex]

From the question

mass of metal = 54.52 g

Volume of metal = new volume - original volume of water in the cylinder

That's

new volume = 28.85 mL

original volume of water = 23.44 mL

Volume of metal

= 28.85 - 23.44 = 5.41 mL

Next we convert the volume from mL to cm³

1 mL = 1 cm³

5.41 mL = 5.41 cm³

Substitute the values into the above formula and solve

That's

[tex]Density = \frac{54.52}{5 .41} \\ = 10.07763[/tex]

We have the final answer as

Density = 10.01 g/cm³

Hope this helps you

A physical change is chemically the same after the experiment.
True
False

Answers

Answer: True

Explanation:

what is the mass number of an atom or ion with one proton, two neutrons, and one electron?

Answers

Answer:

3

Explanation:

mass no.=protons+neutrons

mass no.=1+2=3

Compare and contrast how are predation and parasitism similar how do they differ

Answers

Predation and Parasitism are similar in the way that the predator and parasite feed off the prey and host, and the prey and host generally are harmed in some way. However, a parasite is bound to the host, and can’t survive without it, while a predator can survive without just one specific prey.

Which phrase describes an irregular galaxy?

Answers

Hey xxx

The phrases of an irregular galaxy
These are companion galaxies to our own Milky Way, and can be easily seen at dark sites in the Southern Hemisphere. The Large (left) and Small (right) Magellanic clouds are prime examples of irregular galaxies.

I hope this helped ☺️

Calculate the millimoles of solute in 1.88 L of a 0.00713 M NaCN solution. millimoles:

Answers

Answer:

13.4 milimoles.

Explanation:

The following data were obtained from the question:

Volume = 1.88 L

Molarity = 0.00713 M

Millimoles of NaCN =?

Next, we shall determine the number of mole NaCN in the solution. This can be obtained as follow:

Molarity = mole /Volume

Volume = 1.88 L

Molarity = 0.00713 M

Mole of NaCN =?

Molarity = mole /Volume

0.00713 = moles of NaCN /1.88

Cross multiply

Mole of NaCN = 0.00713 × 1.88

Mole of NaCN = 0.0134 mole

Finally, we shall convert 0.0134 mole to Millimoles. This can be obtained as follow:

1 mole = 1000 millimoles

Therefore,

0.0134 mole = 0.0134 × 1000

0.0134 mole = 13.4 milimoles

Therefore, the millimoles of the solute, NaCN in the solution is 13.4 milimoles

How is the light emitted by an atom related to its electron configuration?A. Light is produced when an electron moves from a higher to a lower energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.B. Light is produced when an electron moves from a lower to a higher energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.C. Light is produced when a proton moves from a higher to a lower energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.D. Light is produced when a proton moves from a lower to a higher energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.

Answers

Answer:

Light is produced when an electron moves from a higher to a lower energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.

Explanation:

According to the Bohr's model of the atom, energy is given out by an atom when an electron moves from a higher to a lower energy level. The energy of the emitted light is equal to the energy difference between the two energy levels.

Hence ;

∆E= E2 - E1

Where;

E2 = energy of the higher energy level

E1 = energy of the lower energy level.

By supplying light of various frequencies and observing the frequency/wavelength of light emitted by a particular atom, its electron configuration can be determined.

Convert 75 mL of water to gallons (show work) ​

Answers

Answer:

0.01981 gallons.

Explanation:

In this problem, we need to convert 75 mL of water to gallons.

We know that, 1 gallon = 3785.41 mL

To convert 75 mL to gallons, we must use to the unitary method such that,

1 mL = (1/3785.41) gallon

So,

[tex]75\ mL=75\times \dfrac{1}{3785.41}\\\\=0.01981\ \text{gallons}[/tex]

So, there are 0.01981 gallons in 75 mL of water.

All organisms need a place to live that provides

Answers

Answer:

Living Space get food or nutrients, water, and shelter. No matter where an organism lives, it must provide what it needs to survive.

Explanation:All organisms need a place to live, and store energy to take care of itself.

I need help on these two questions please!!!

Answers

the answer to number 6 is a!

Answer:

5. A. Shape and volume

6. A. Solid to liquid

7. C. Gas

Calculate the volume of a sample of mercury with a density of 14.6 g/mL and a mass of 1.00 g.
The answer is assumed to be in mL. Please include a numeric value only with significant figures​

Answers

Answer:

hiiiiiiiijsiosoaplq

Consider an ion with the symbol X2+ formed from a representative element. (5.2, 5.3)a. What is the group number of the element?b. What is the electron-dot symbol of the element?c. If X is in Period 3, what is the element?d. What is the formula of the compound formed from X and the nitride ion?

Answers

Answer:

a) the element belongs to group 2

b) see image attached

c) Magnesium

d) X3N2

Explanation:

Any ion with the formula X^2+ was derived from group 2 elements. The group two element found in period 3 is magnesium alone.

Since the nitride ion has a valency of -3 and X^2+ has a valency of +2 , then a compound formed between X^2+ and the nitride ion will have the formula X3N2.

a. The group number of the element can be determined by knowing the charge of the ion. In the ion X2+ has a charge of 2+. Since representative elements typically form ions with charges equal to their group numbers, we can conclude that the group number of the element X is 2.

b. The electron-dot symbol, also known as Lewis dot symbol, represents the valence electrons of an element. Since X is a representative element in Group 2, it has two valence electrons.

c. If X is in Period 3, it could be one of the elements from Group 2 in that period. The most likely element would be Magnesium (Mg), as it is the representative element in Group 2 of Period 3.

d. The nitride ion has a charge of 3-. To form a neutral compound, the charges of X and the nitride ion must balance out. Since X has a charge of 2+ and the nitride ion has a charge of 3-, we need two X ions to balance the charge of three nitride ions. Therefore, the formula of the compound formed from X and the nitride ion is X3N2.

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Someone pls help me I don’t know this one

Answers

I believe it’s B. Plants, grasshopper, snake, mushrooms. The other ones don’t follow the flow of the arrows/ don’t go the same way the arrows are pointed. I hope this helps

What is true about all uranium atoms?
They each have the same number of nuclear
particles.
They each have the same number of neutral
particles.
O They each have the same number of neutrons.
They each have the same number of protons.

Answers

Answer:

they each have the same number of protons

Answer:they each have the same number of protons

Explanation:

I just took the test

Two substances, A and B, with the same melting point. How can you determine if they are the same without using any form of spectroscopy? Explain in detail.

Answers

Answer:

Simply carry out the mixed melting point procedure

1 here grind the two substances mix them

2.take note of the melting point of the mixture this is P

3 also get the original product from a different source okay this is Q

4.so I the melting point of P = Q then they represent a similar compound

5. But if melting point of P is not equal to Q then one of the compounds is P is acting as an impurity so they are not the same

The compound has been similar or not has been determined with the determination of the shift in the melting point of the mixture of the two compounds.

The melting point can be defined as the temperature of the substance when it has been converted from the solid state to the liquid state.

The two substances were found to have the same melting point. The compounds have been determined whether they are similar or not by the determination of the melting point of the combined mixtures.

The compounds A and B have been mixed together, and the melting point has been determined. The similar compounds in mixing will give the same melting point. While if the compounds are different, there has been a shift in the melting point of the mixture.

Thus, the compound has been similar or not has been determined with the determination of the shift in the melting point of the mixture of the two compounds.

For more information about the melting point, refer to the link:

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Do molecules break or build from a solid to a liquid?

Answers

Answer:

they break

Explanation:

Molecules move more freely when it is a liquid state. To keep it a solid, it will bunch together.

Answer:

I think they break.

Explanation:

They do not build a solid to a liquid

How you could use the scientific method to learn whether water really does take longer to boil if you are watching it.​

Answers

Answer:

Please find the detailed explanation below

Explanation:

A scientific method is a sequence of steps that is used to solve a problem. Every scientific method begins with a problem that needs to be solved.

Hence, in order to determine whether water really does take longer to boil if you are watching it, we employ the steps involved in a scientific method.

1) Ask a question/Make observation: This must initiate the process. The observation/question made here is that DOES WATER TAKE LONGER TIME TO BOIL WHEN WATCHED?

2. Formulating hypothesis; an hypothesis is a testable prediction of a possible solution to the stated problem. In this case, an hypothesis could read: IF water is watched while boiling, THEN it will take a longer time to boil. A hypothesis must be tested for it to be proved or disproved.

3. Test hypothesis: The formulated hypothesis is tested via conducting an experiment. The set up of the experiment can involve one group where water is boiled while watching it and another where water is boiled without watching. The former group is called Experimental group, while the latter group is called Control group. The time it takes for each group of water to boil will be recorded.

The independent variable (manipulated variable) will be the WATCHING, while the dependent variable (tested/responding variable) will be the TIME IT TAKES FOR WATER TO BOIL

4. Analyse the data; the data refers to the recorded time for each group of water. This will be analysed and compared.

5. Make conclusion; the conclusion depends on the result, which is the recorded time for each group of boiled water. Based on the result, the hypothesis can either be rejected or accepted. For example, if the control group boils faster than the experimental group, our hypothesis will be accepted but if otherwise, the hypothesis will be rejected.

Therefore, via the scientific method, it can be determined if it really takes longer time for water to boil while watched.

Mike rides his motorcycle North at an average velocity of 20 meters/second for 500 seconds, how far did he ride?

Answers

Answer:

10000

Explanation:

Answer:10,000 meters

Explanation:20x500=10,000

Does standard enthalpy use net ionic equations?a. Trueb. False

Answers

Answer:

True

Explanation:

In an ionic reaction, the net ionic equation is used to calculate the standard enthalpy of reaction.

Hence the standard enthalpy of any ionic reaction can be obtained by considering its balanced net ionic reaction equation, hence the answer above.

Please answer ASAP >_<



What does xylem do in a plant?
•transport food
•transport water
•prevent water loss
•perform photosynthesis

Answers

Answer:

The correct answer is B. Transport water.

Explanation:

I did this quiz. :)

Xylem transport water. Therefore, the correct option is option B among all the given options. The vascular tissue of plants called xylem.

What is xylem?

The vascular tissue of plants called xylem transports water plus dissolving minerals from the roots towards the rest of the plant while also offering structural support. The tracheary components, a collection of specialized, water-conducting cells, make up xylem tissue.

All vascular plants, along with the seedless club mosses, fern, horsetails, all angiosperms (flowering plants), and gymnosperms, include xylem in addition to phloem (tissue that transports glucose from the leaves to the rest of the plant) (plants with seeds unenclosed in an ovary). Xylem transport water.

Therefore, the correct option is option B.

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Can somebody help me please? it’s urgent

Answers

Answers:

See attached table

Explanation:

The isotope symbol will have the mass number and chemical symbol.  The atomic number will be equal to the number of protons because the atomic number is the number of protons in an atom.  The electrons will be equal to the protons because the atom is neutral.  The neutrons can be found by subtracting the number of protons from the mass number.  The mass number can be found by adding the protons and neutrons.  It is also in the name of the isotope.

Rotation about a carbon-carbon double bond does not readily occur because: __________.1) the overlap of the p orbitals of the carbon-carbon π bond would be lost2) the double bond is much shorter and therefore more difficult to rotate3) the overlap of the sp2 orbitals of the carbon-carbon σ bond would be lost4) the double bond is much stronger and therefore more difficult to rotate

Answers

Answer:

1) The overlap of the p orbitals of the carbon-carbon π bond would be lost

Explanation:

Unlike simple bonds, a double bond can not rotate, since it is not possible to twist the ends of the molecule without breaking the π bond.

In the structure of but-2-ene present in the attachment, we can see the two isomers, cis and trans. These isomers cannot be interconverted by rotation around the carbon-carbon double bond without breaking the π bond.

Perform the following conversion: 6.1 × 103 K (the surface temperature of the Sun) to °F and °C. Pay attention to the number of significant figures in this problem. (Enter your answers in scientific notation.)

Answers

Answer:

[tex]\°C=5.8x10^3\°C[/tex]

[tex]\°F=1.1x10^4\°F[/tex]

Explanation:

Hello,

In this case, for the calculation of the temperature in degree Celsius we subtract 273.15 to the given temperature in kelvins:

[tex]\°C=6100-273.15\\\\\°C=5.8x10^3\°C[/tex]

Next, by applying the following equation we compute it in degree Fahrenheit:

[tex]\°F=(5.8x10^{3}*9/5) + 32\\\\\°F=1.1x10^4\°F[/tex]

Clearly, since the initial unit has two significant figures the computed units also show two significant figures.

Regards.

Which of the following correctly lists the compounds in order of decreasing acidity?
A) H2O > HCCH > NH3 > CH3CH3
B) HCCH > H2O > NH3 > CH3CH3
C) CH3CH3 > HCCH > NH3 > H2O
D) CH3CH3 > HCCH > H2O > NH3
E) H2O > NH3 > HCCH > CH3CH3

Answers

Answer:

A) H2O > HCCH > NH3 > CH3CH3

Explanation:

H2O is known as a neural compound which a pH close to 7.0. This however makes it more acidic due to it having the lowest pH when compared to the others in the option.

The other options however have their acidic strength as follows: HCCH > NH3 > CH3CH3. This explains why the pattern of decreasing acidic strength is H2O > HCCH > NH3 > CH3CH3

Given that O2 is paramagnetic and has a bond order of 2, and its highest occupied molecular orbital is antibonding, what would be the expected bond orders for O22- and O22

Answers

Answer:

Bond order of O22- = 1

Bond order of O22+ = 3

Explanation:

The bond order is given by;

1/2(number of bonding - number of anti bonding electrons).

In O22- , there are ten bonding and eight anti bonding electrons giving a bond order of 1 from; 1/2 (10 - 8) = 1

Similarly, for O22+ , we have ten bonding and four antibonding electrons, hence;

1/2 (10 - 4) = 3

Read the scenario, then answer the questions. A 2 kg ball is thrown upward with a velocity of 15 m/s. What is the kinetic energy of the ball as it is being thrown? J What is the potential energy of the ball when it gets to its maximum height just before falling back to the ground? J

Answers

Answer:

225 for both answers

Explanation:

The only reason i know this is because i got it wrong. 225

Answer:

225J on both of the questions.

List three different forms of potential energy

Answers

Answer:

Types of Potential Energy

Elastic Potential Energy. Anything that can act like a spring or a rubber band can have elastic potential energy. ...

Gravitational Potential Energy. There is a constant attractive force between the Earth and everything surrounding it, due to gravity. ...

Chemical Potential Energy.

(IF THIS HELPED CAN YOU GIVE ME A BRAINYLEST PLEASE?)

What’s the symbol of the element that has 8 protons, 9 neutrons, and 8 electrons

Answers

Answer:

oxygen

Explanation:

 The given isotope has 8 protons and 8 electrons, so the atomic number of the given isotope is 8, which is the atomic number of oxygen.

What is kinetic energy? Give an example please.

Answers

Kinetic energy is moving energy or the energy of motion.

If an object is moving like a rock rolling down

a mountain, we say the rock has kinetic energy.

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you are varsha varun the secretary of the students forum of navodya school Bikaner you have planned an excursion to bhubaneshwar and nearby places during summer vacation write a letter to the general manager Northern railways asking for reservation of the bogie for 60 children from Bikaner to bhubaneshwar and back supplying all the necessary information help me plspslsplpsl 42x^2+34-8-12 Solve for a6=a/4+2 Steps please Which of the following does not involve chemical processes? A. cooking of food B.Changing of fruit color when it ripens C.Burning of Wood D.None of the above Which compound would be expected to show intense IR absorption at 2710 and 1705 cm-1? (Ph = phenyl group)A. CH2=CHCOCH3B. PhCHOC. CH3COCH2CH3D. PhCOCH3E. CH3Cl Cierto banco emplea 59 personas en dos sucursales. De esta gente, 27 son universitarios graduados. Si una cuarta parte de las personas que laboran en la primera sucursal; y tres quintos de los que se encuentran en la segunda sucursal, son universitarios graduados, cuntos empleados tiene cada sucursal? John travels in an airplane a distance of 800 km. For half of the distance, theairplane flies at a speed of 900 km/h and for the rest of the distance, it flies at aspeed of 760 km/h. How long does the trip take? You guys please help with my most recent questions! Im not the smartest Ik What does the government need to issue a warrant A believer in monotheism 1 If one leg of a right triangle is 3 meters, and the hypotenuse is 5 meters, what is the length of themissing leg? According to the Newton's second law, which of the following is TRUE about a person pushing a lawn mower? The net external force applied by the person is the push plus friction exerted on a lawn mower. B The force exerted by the person pushing the mower must be less than the friction opposing the motion. The direction of the acceleration is the same direction as that of the net force, which is parallel to the ground. D The direction of the acceleration is the same direction as that of the force of friction, which is parallel to the ground. For each case below, identify the most likely value for x: a. BHx b. CHx c. NHx d. CH2Clx Solve -1 4/5x = 9. 5 1/5 -5 -1/5 5. Notice & Note Reread what the goldfish tells Sergei in paragraph 22.What lesson is this archetypal wise character trying to convey? How doesthistesson reveal a theme of the story? Debbie is running to raise money for a fundraiser. If her goal is to run 56 miles , how many days will debbie need to run if she runs 1.75 miles everyday The EOQ modelA) determines only how frequently to order.B) considers total cost.C) minimizes both ordering and holding costs.D) all of the alternatives are correct. -34 -2p = 8(8 - 2p) How do I wrote Five less than the quotient of a number and 3 is -7 2+3x=8 Solve for X?