what is the estimated digit in the number 0.0643

Answers

Answer 1

Answer:

3

Explanation:

Answer 2

Answer:

There are 3 estimated digits.

Explanation:


Related Questions

NH3 is a _______________

Answers

Answer:

compound

Explanation:

Answer:

your answer would be compound

What do these two changes have in common?
using a large magnet to remove pieces of iron from a junkyard
rain forming in a cloud
Select all that apply.
Both are caused by heating.
Both are only physical changes.
Both conserve mass.
Both are chemical changes.

Answers

Answer: Both are only physical changes.

Explanation:

Both are only physical changes.  

• The material, which takes part in the change is structurally similar after and before the change is known as the physical change.  

• The cloud formation is a physical change as when evaporation of water takes place  it goes into the air and produces cloud by the process of condensation. The same water goes back to earth by the process of precipitation and this get repeated again and again.  

• A chemical change takes place when formation of new substance takes place by combining two substances. In the case, when a magnet picks up iron in a junkyard, one is still having an iron and a magnet, no formation of substance is taking place. So it is a physical change.  

Thus, both the given processes are examples of only physical changes.

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An aluminium atom has a mass number of 27 and a proton number of 13. How many neutrons does this aluminium atom contain?

Answers

Explanation:

14 neutrons

Explanation: The mass number is the total number of protons and neutrons in a nucleus. The atomic number is the number of protons in the nucleus. →27−13=14 neutrons!


Which of the following neutral atom configurations satisfies the octet rule?
1s2 2s2 2p6 3s2 3p6
1s2 2s1
1s2 2s2 3s2 3p4
1s2 2s2 3s2 3p6 4s1

Answers

Answer:

2

Explanation:i did the test

1 mole of a gas occupies 22.4 L at ________

Answers

Answer: At STP, one mole (6.02 × 1023 representative particles) of any gas occupies a volume of 22.4 L (Figure below). A mole of any gas occupies 22.4 L at standard temperature and pressure (0°C and 1 atm).

Explanation:

That the answer

1 mole of a gas occupies 22.4 L at (0°C and 1 atm). It is the standard temperature and pressure.

What is Avogadro's hypothesis?

Avogadro's hypothesis says that all gases have an equal number of particles at the same temperature and pressure.

The empty space between the particles makes up the majority of a gas's overall volume.

Due to this, the size of the particles themselves is nearly insignificant.

The volume of one mole of a gas at standard temperature and pressure is known as the molar volume.

Thus, the correct option is 0°C and 1 atm.

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Which orbital indicated on the periodic table???

S
P
D
F



Help ASAP I’ll mark as brainlister:)

Answers

I think it’s S umm let me know if I’m wrong but I’m. 80 precent sure it’s S

What is the correct lewis dot structure for
24
12Mg 2+?

Answers

Answer:

Mg with 2 dots

Explanation:

Mg: as the valnce shell of Mg has 2 electrons only

presented by 2 dots

If you go to the moon your mass would ___.

stay the same

increase

Answers

Answer:

stay the same

Explanation:

you would weigh less if u stood on a scale but you're still the same mass unless you chopped of a body part or something

It Stays the same....

How can we gather more evidence about weather lava or water formed the channel on Mars

Answers

you can do that by scientific studies

HELP ME THIS IS DUE TODAY PLEAS HELP SO I DONT FAIL

Answers

For the first one it’s 69 just count the little lines from the side.

help :(
If 4.7 moles of oxygen gas are allowed to react with 3.9 moles of iron according to the following equation:
4 Fe + 3 O2 → 2 Fe2O
How many moles of Fe2O3 can be formed?​

Answers

Moles of Fe₂O₃ formed : 1.95

Further explanation

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

[tex]\tt 4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]

We find the limiting reactant from the ratio of the mole and the reaction coefficient

Fe ⇒ 3.9 : 4 = 0.975

O ⇒ 4.7 : 3 = 1.56

Because the ratio of Fe is smaller, then Fe becomes the limiting reactant

Reaction

4Fe + 3O₂ ⇒ 2Fe₂O₃

mol Fe₂O₃ from mol of Fe as limiting reactant

mol ratio Fe₂O₃ : Fe = 2 : 4, then mol Fe₂O₃ :

[tex]\tt =\dfrac{2}{4}\times 3.9=\boxed{\bold{1.95}}[/tex]

During a change in state, energy is transferred in the form of
heat

light

moisture

motion

Answers

Answer:

heat I think.....

Hope it will help you......

During a change in state, energy is transferred in the form of heat.

Hence, Option (A) is correct.

What is States of matter ?

When energy is added or removed to matter in the form of heat, it changes state to form a state of matter.

A state of matter is defined as one of the ways in which matter can interact with itself to form a homogeneous phase.

Therefore , During a change in state, energy is transferred in the form

of heat. Hence, Option (A) is correct.

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Which statement best describes a physical change?

Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.

Answers

Answer:

Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.

Explanation:

Answer:

Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.

Explanation:

im smart

The expression of the speed of light can be written as: (C =

Answers

Answer:

The expression of speed of light can be written as "c".

Explanation:

The speed of light is denoted by c. It is originated from the Latin word celeritas which means "speed".  Its value is 3×10⁸ m/s.

It is related to the frequency and wavelength as follow,

Speed of light = wavelength × frequency

c = λ × f

λ = c/f

This formula shows that both frequency ad wavelength are inversely related to each other.

Frequency is taken in Hz.

It is the number of oscillations, wave of light make in one second.

Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.

Science investigation skills

(I need to have 5 answers )


Answer 1.

Predict



Answer 2.

Use variable


Answer 3.

Plan and conduct investigations

Answer 4.
Draw conclusions


Answer 5.

Hypothesize


Answer 6.

Measure


Answer 7.

Classify and order




Answer 8.

Record and display data


Answer 9.

Use time and space relationships




Answer 10.

Use numbers

Answers

Answer:

Explanation:

-------Choices  ---------------

Predict

Use variable

Plan and conduct investigations

Hypothesize

Measure

Classify and order

Record and display data

Use time and space relationships

Use numbers

=================

Selection:

These are in approximate order:

Hypothesize:  Build an explanation of the observation.  The hypothesis should be done after a thorough review of existing information.  Library database searches and researcher interviews are suggested.Predict:  prediction of what would happen if the explanation were correct.  E.g., If an atom is homogenous and has no internal structure, then bombarding it with with neutrons will result in most neutrons going right through the atom, and none would be reflected backwards.

Plan and conduct investigations:  Design experiments that test the hypothesis.  E.g., see if any neutrons are reflected backwards.  If they are, the hypothesis needs to be changed.

Measure:  Do the work.  Calibrate the equipment and record everything.

Record and display data:  Publish the results and conclusions for peer review.  Seek other's input in order to generate general agreement that the data, procedure, and conclusions are warranted.

===

Use numbers?  Nah.  Not if they are not required to reach a conclusion.(e.g., the precipitate will be pink or the reaction will stink).

Use Time and Space Relationships:  Yes, but only if the hypothesis depends on them.

Classify and Order:  OK, especially if you are a biologist, but not always necessary.

Use variable:  usually, but what and how depends on the experiment.

Blame:  Place blame on the lab partner (Just kidding).

(GIVING BRAINLIEST)
Balance each of the following chemical equations below

Answers

Explanation:

A.

AgNO₃ + KCl → AgCl + KNO₃ (Already Balanced)

B.

H₂O + SO₃ → H₂SO₄ (Already balanced)

C.

2KI + Cl₂ → 2KCl + I₂

D.

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

E.

Zn + 2HCl → ZnCl₂ + H₂

F.

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

G.

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

H.

2Al + 3CuCl₂ → 2AlCl₃ + 3Cu

Please help!!!!!!!!! ASAP!!!

Answers

Answer:

0.00505

Explanation:

You can google the answer or try to learn how to convert it

In a chemical change, the same atoms are recombined into a new substances,
True
Or False

Answers

Atoms from DIFFERENT elements can combine to make a new substance so I would say that one is false sorry if Iam wrong :( i think it’s right because it produces a new substance with different or new atoms
I’m pretty sure the answer would be true

Explain the law of conservation of mass.

Answers

Answer:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

Explanation:

Your answer should be- that in a chemical reaction mass is neither created nor destroyed.

Explanation:

Is that good?

PLEASE HELP WILL GIVE BRAINLIEST​

Answers

It’s the atomic number.

Why does a planet stay in orbit?

Answers

Answer:

Gravity

Explanation:

A planet is gravitationally pulled around the sun.

Answer:

beause of gravitys pull and because the atmosphere of the beyond lol also bcs this i hope this helps your welcome boo >3

Explanation:

Newton realized that the reason the planets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pulls on the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.

which type of matter cannot be broken done into simplier substances by a chemical change

Answers

Answer: Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P 4) or sulfur (S 8) cannot be broken down into simpler substances by these reactions. Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid

Explanation:

Answer:

elements because they are the simplest form of matter so they can't be broken

Explanation:

Hope this helps:)

calculate the atomic mass of carbon if the two common isotopes of carbon have masses of 12.000 amu (98.89% abundance) and 13.003 amu (1.11% abundance)

Answers

12.01 amu

Work:

(12.000 × .9889) + (13.003 × .0111) = 12.01

turn the precents into decimals

Which pair of atoms are isotopes of each other?
a
oxygen-16 and oxygen-18
carbon-14 and nitrogen-14
iodine-131 and iodine-131
e
d
radium-222 and radon-222

Answers

Answer:

b sorry if im wrong

Explanation:

hope it helped

what's the difference between series and parallel circuit in table form?​

Answers

Hey :)

In a parallel circuit, a different amount of current flows through each parallel branch of the circuit.

In the series circuit, different voltage exists across each component in the circuit.

Whereas in the parallel circuit, the same voltage exists across the multiple components in the circuit.


Hope this helps :)
When there are two or more electrical devices in a circuit with an energy source, there are a couple of basic ways by which we connect them. They can either be connected in series or parallel. A series circuit is a circuit in which two components share a common node and the same current flows through them. However, in a parallel circuit, components share two common nodes. In this article, let us look at more differences between series and parallel circuit.

Help plsss!
If the average atomic mass is 39.948amu, which isotope is more abundant?

Answers

Answer:

It depends on which element you are talking about. I appears that no element has an average atomic mass of that number. So, for the question, if it assumes that there are two isomers with 39 amu and 40 amu, then the 40 amu one would be more abundant. But again, there are different possible isotopes and I can't tell what the question wants.

What did you find out from this investigation? Be thoughtful in your answer.

Answers

What’s the invistagation about????

Which term describes this molecular shape?

A. Tetrahedral

B. Bent

C. Trigonal planar

D. Linear

Answers

Answer:

A

Explanation:

Tetrahedral

The term that describes the molecular structure is Tetrahedral. The correct option is A.

What is molecular structure?

The molecular structure is the structure of the molecular compounds. It tells the presence of ions and bonds in a compound. It is the arrangement of atoms, groups, or ions in a molecule, as well as the quantity and distribution of chemical bonds.

The use and importance of molecular structure are comprehending Nature's complex design principles and blueprints depend on understanding molecular structure.

Perhaps we can start to imitate her lovely items more cheaply and with less negative environmental effects if we can comprehend her plans and fundamental materials. The given compound is tetrahedral.

Thus, the correct option is A. Tetrahedral.

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PLS HELP!!! ASAP!! 10 POINTS!!

Which of the subatomic particles are most responsible for the identity of an element?

neutrons
electrons
atoms
protons

Answers

Protons

Protons are the subatomic particle that determines the identity of an element.

Answer:

Explanation:Protons and neutrons are located in the nucleus of an atom and determine the mass of an atom. Protons have a positive electrical charge and electrons have a negative electrical charge. Atoms that have the same number of protons and electrons do not have an electrical charge.

write down the similarities and differences of Continental and temperature climatic zones​

Answers

Answer:

Temperate climates, otherwise known as meso-thermal climates, are cooler than subtropical climates, but warmer than polar climates. A continental moderate climate is another sub-type of temperate climates. These regions have hot, rainy summers and cold, dry winters.

Explanation:

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Solve [tex]x^{3}[/tex] = 64. Which word's root means "to heat?" ( 5. Which one is NOT an indefinite article? *(0.5 Points)launosununa Using only facts to explain or describe is being ___________________________ .Group of answer choicesA)objectiveB)factualC)subjectiveD)influential An archway in front of a school is in the shape of a parabola. The top of the arch is the vertex (0,0). The school seal is at the focus, 2.5 feet below the vertex, and the arch is 18 feet wide at the ground Describe how a persons metabolism can affect vital signs What is the slope of the line that passes through the point (8, - 4) and (6, 2) ? Write your answer in simplest form. why were martin and cheryl always excited to visit their grandfather in medicine bag a child riding a bicycle at 15 meters per second accelerates at -3,0 meters per second? for 4.0 seconds. What is the child's speed A at the end of this 4.0-second interval? (with work, all steps)) If 120 customers have bought tickets today, how many free tickets has the manager given away Please help meeeeeeeeeeeeeeeeee Summarize the main idea of the quotation."The many great gardens of the world, of literature and poetry, of painting and music, of religionand education, all make the point as clear as possible: The soul cannot thrive in the absence of agarden. If you don't want paradise, you are not human; and if you are not human, you don't have asoul."- Thomas More TIME REMAINING 45:30 Which of the following statements about Haden Edwards is FALSE? a. He was originally a resident of the United States. b. He was a prospector. c. He established his first colony in west Texas. d. He was an empresario. Please select the best answer from the choices provided A B C D i will mark braineliest if it takes 3.5 hours for the Hogwarts Express, moving at a speed of 120 mi/hr, to make it from Platform 9 and 3/4 to Hogwarts, how far apart are they? may somone give me the answers with question 3 4 and 5. one BRAINLIEST IF SOMONE CAN ANSWER AND FIVE STAR answer for these. this is not any kind of test. Match the subject with the correct form of the verb HABLAR.Question 3 options:hablashablahablishablamoshablanhablo1. yo2. t3. l/ella/usted4. nosotros5. vosotros6. ellos/ellas/ustedes Write an equation for the description. Ten times the sum of half a number x and 6 is 10. What was special about the white spear? Neurons contain which two structures that help them transmit messages?sarcomeresdendritesan extracellular matrixaxons