How many significant figures are in the following number? 3,000.0 x 10⁴ grams

Answer:

A a chemical change

Explanation:

because a chemical change is when you mix tow substance together and they creat a new substance

Answer: 3 significant figures

Explanation: because in scientific notation only the before and after decimal number are considered but in standard form all numbers including exponents are all significant figures

Answer:

3 significant figures

Explanation:

0's are not significant.

I hope it helps you!

[tex]GraceRosalia[/tex]

Answer:

Explanation:

Let's try and figure out the ones you don't keep.

Receipts from the dollar tree. You can't return what you bought and you only paid a dollar. It's not worth it.

Food receipts. You can't return it and unless you want to itemize what you spend / month and on what, they don't serve any purpose.

Now figure out which ones you would want to keep

1. Anything pertaining to medical perscriptions. I don't know how it works in the United States, but in Canada we are allowed to deduct only medications with a DIN number.

2 Anything that you would use for travelling that is not for pleasure (ie it is a business expense). So if you are a salesman and your territory is from A to B you would deduct meals, mileages, motels if you must stay away from home

3 In the states some tax receipts are deductible, so you might want to save those.

Answer:

41.184 pounds

Explanation:

Calculate the total grams first.

180 x 104 = 18,720 grams

Convert that into kilograms (kg)

18,720g         1 kg

------------ X  -------------  = 18.720 kg

     1              1000 g

Convert kilograms into pounds.

18.729 kg         2.2 lb

---------------  X  -----------   =  41.184 lb  (pounds)

       1                 1 kg

Answer:

hot to cold matter

Answer:

1

Explanation:

x + 3 =4

subtract 3 from 4

You are left with one.

Plug in the answer

1+3=4

Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.

Answer:

A compound is a unique substance that consists of two or more elements combined in fixed proportions.

Explanation:

okkk

Answer:group 1A(1)

Explanation:

Answer:noble gases

Explanation:

Answer:

what

Explanation:

i d k what this question is

Answer:

6

Explanation:

The age of the charcoal sample in the campfire in use is equal to the time taken for the decay of 0.22 of C-14 to 0.055 Bq. Hence its age is 11552.45 years.

Unstable radioactive isotopes of atoms undergo nuclear decay by the emission of charged particles such alpha or beta particles. Radioactive decay is a first order reaction. Thus, the decay constant is written as:

k = 1/t ln (W0 / Wt)

where W0 be the initial weight and Wt be the weight after time t.

The decay constant is related to the half life time of the sample by the expression:

k = 0.693 / t1/2.

Given that t1/2 of C-14 = 5730 years.

Thus, k = 0.693 /5730 = 0.00012 yr⁻¹.

Now, we can calculate the time t using the first order equation.

t = 1/k ln ln (W0 / Wt)

= [ ln (0.22 Bq/  0.055 Bq) ] / 0.00012 yr⁻¹

= 11552.4 years.

Therefore, the age of the sample of charcoal is 11552.4 years.

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Answer:

True

Explanation:

the hydrogen moves to an excited state and electrons will move to higher energy levels

Answer:

4

Explanation:

please mark brainiest

K(s) + 2HCl(aq) ----> 2KCl (aq) +H2(g) is an example of single replacement reactions.

A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound.

Single-replacement reactions always involve two pure elements and one aqueous compound/solution. In the above reaction, the A and C would be pure elements.

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.

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v=5.0×10^12Hz

[tex]\\ \sf\longmapsto E=hv[/tex]

[tex]\\ \sf\longmapsto E=6.626\times 10^{-34}Js\times 5\times 10^12s^{-1}[/tex]

[tex]\\ \sf\longmapsto E=33.13\times 10^{-22}J[/tex]

Atomic Particles

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Explanation:

3 moles of O2 will be produced from 2moles of NaCLO3.

hope this helps you.

The mass of H2O is produced by the combustion of 1.00 mol of CH4 is 36.0 grams.

The term molar mass is defined as the mass of 1 mole of that particular substance and number of grams per mole of a compound.

The balance chemical equation is as follows:

CH4(g) + 202(g) → CO2(g) + 2H2O(e)

The mass of H2O = 36.0 g

Calculating the mass of H2O produced

mass of H2O = 1.00 mol CH4 × (2 mol H2O / 1 mol CH4) × (18.015 g H2O / 1 mol H2O)

mass H2O = 36.0 grams

Thus, The mass of H2O is produced by the combustion of 1.00 mol of CH4 is 36.0 grams.

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Answer:

(not sure what's the question ) Captionless image??

Answer:C

Explanation:

The given electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁸ is the Nickel (Ni). Therefore, option (B) is correct.

The electron configuration can be explained as electrons being filled in different energy levels of an atom of a particular element. In the electron configuration, the number of electrons is usually written as a superscript of atomic subshells. For example, the electron configuration of Oxygen is written as 1s²2s²2p⁴.

The sequence of fully filled subshells that correspond to the electronic configuration of a noble gas is denoted by square brackets. The principal quantum number (n) can be used to evaluate the maximum number of electrons in an electron shell.

The value of 2n² is given the maximum number of electrons. The atomic orbitals at low energy must be filled first occupying an orbital with a higher energy level.

The total number of electrons filled in the given electronic configuration  1s²2s²2p⁶3s²3p⁶4s²3d⁸  is 28. The atomic number of Nickel is 28 therefore it is the configuration of Nickel.

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Answer:

Krypton

Explanation:

Answer:

C

Explanation:

trust me :)

Answer:

Cesium atomic number 55

"An unbalanced force will move the box down"

I could be wrong but I tried

And it's ok if you don't give brainliest to me

But I hope this helped:)

Have a wonderful day!

Answer:

Firstly, We have to convert it in the Miles formula...

No. of moles = Mass given/Molar Mass

So, the final answer be come