100 POINTS! (50 split up) PLSSSSSSSSSS HELP!!! I REALLY NEED IT SO MUCH :( I PROMICE TO GIVE BRAINLIEST AND FIVE STARS AND A THANKS! 6TH GRADE SCIENCE! i used all my points for this!
You measure the mass of an apple using a balance. You get these three measurements:
Trial 1: 167.0 g
Trial 2: 166.9 g
Trial 3: 167.2 g
You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer in a paragraph for the best grade.

Answer:

d

d

Explanation:d

Answer:

I think it's green or blue...

Answer:

B. 1 +8 > 2 + 4

Explanation:

Hello!

In this case, since inequalities show how a number is different, greater or less than, to an other, considering the given options, just B. 1 +8 > 2 + 4  is an inequality because if we solve the operation we obtain:

9 > 6

Which means that nine is greater than 6.

Best regards!

Answer:

V₂ =  7546  L

Explanation:

Given data:

Initial volume = 49.0 L

Initial pressure = 154 atm

Final pressure = 1 atm

Final volume = ?

Solution:

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

154 atm × 49.0 L = 1.00 atm × V₂

V₂ = 7546 atm. L/1 atm

V₂ =  7546  L

Answer:

sodium fluoride

Explanation:

Answer:

Explanation:

Formula of percent composition:

% X = ( mass of element in compound / total mass of compound ) × 100

11) Al₂O₃

Al = 27 g/mol

O = 16 g/mol

%Al = (54 / 101.96) × 100

%Al = 52.9%

%O = (48 / 101.96) × 100

%O = 47.1%

12) C₅H₅O₅

C = 12 g/mol

H = 1 g/mol

O = 16 g/mol

C% = (60 / 145 ) × 100

C% =41.4%

H% = (5 / 145 ) × 100

H% =3.4%

O% = (80 / 145 ) × 100

O% = 55.2%

13) BaBr₂

Ba = 137.3 g/mol

Br =79.9 g/mol

Ba% = (137.3 / 297.14) × 100

Ba% = 46.2%

Br% = (159.8/ 297.14) × 100

Br% = 53.8%

14) Fe₃(PO₃)₂

Fe = 55.8 g/mol

P = 31 g/mol

O = 16 g/mol

Fe = (167.4/325.48)  × 100

Fe = 51.43%

P = (62/325.48)  × 100

P = 19.05%

O = (96 /325.48)  × 100

O = 29.49%

Answer:

Length of whale in km = 0.028578 km

Explanation:

Given:

Length of whale = 28,578 millimeter

Find:

Length of whale in km

Computation:

We know that;

1 km = 1,000,000 mm

So,

Length of whale in km = 28,578 / 1,000,000

Length of whale in km = 0.028578 km

Answer:

The answer is 0.28578 km, and the conversion is below in the explanation.

Explanation:

28578 mm * (1 meter/1000 millimeters) * (1 kilometer/1000 meters)

The millimeter units will cancel out, then the meter units will cancel out, leaving you with 28578/1000, then divide again by 1000.  The answer is 0.028578 km.

Preventing exposure to high-energy particles is essential for the short-term success of the mission, and for the long-term health of the astronaut.

Answer:

copper

Explanation:

i think it's copper because it's cheep and It exists in abundance

Answer:

37.42×10³

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

. The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

we multiply the values that are without power of 10 and then we will multiply the power of ten by adding the exponent.

7.06×10⁵ × 5.3 ×10⁻²

37.42×10³

Answer:

37.42

Explanation:

This is easy

Explanation:

a) PH>7

b)PH=7

c)PH>7

d) PH>7

Answer:

29.26 gram

Explanation:

No of molecules = no of mole × Avogadro's number

No of molecules = mass in gram/ molar mass × Avogadros number

Mass in gram =No of molecules×molar mass / Avogadros number

Mass in gram = 3.012 ×10^23 × 58.5/6.02×10^23

29.26 gram

Answer:

A. CsBr(s)

Explanation:

we will get here compound with the lowest lattice energy

solution

As we know that Lattice energy is always proportional to the charge of ions and it is inversely proportional to the size of ions.

so that by the smallest charge and the largest size give us the lowest lattice energy and that charge and size is express as here as

Charge

Cs (+1), K(+1), Na (+1), Cl(-1), Br(-1), Sr(+2), Ca(+2), O(-2)     .......................1

and

Size

Na+ < Ca2+ < K+ < Sr2+ < Cs+, O2- < Cl- < Br-                ..........................2

so that here

correct answer is A. CsBr

The CsBr has the smallest charge and maximum size of the ions, the lattice energy of the compound has been the lowest. Thus option A is correct.

Lattice energy can be defined as the amount of energy required to remove a mole of ion to its gaseous state.

The lattice energy has been dependent on the charge and size of the ions.

Higher charge = Higher lattice energy

Higher size = Lower lattice energy

Since the CsBr has the smallest charge and maximum size of the ions, the lattice energy of the compound has been the lowest. Thus option A is correct.

For more information about lattice energy, refer to the link:

https://brainly.com/question/17011733

Answer:

H₂ is excess reactant and O₂ the limiting reactant

Explanation:

Based on the chemical reaction:

2H₂(g) + O₂(g) → 2H₂O

2 moles of H₂ react per mole of O₂

To find limiting reactant we need to convert the mass of each reactant to moles:

Moles H₂ -Molar mass: 2.016g/mol-:

10g H₂ * (1mol / 2.016g) = 4.96 moles

Moles O₂ -Molar mass: 32g/mol-:

22g O₂ * (1mol / 32g) = 0.69 moles

For a complete reaction of 0.69 moles of O₂ are needed:

0.69mol O₂ * (2mol H₂ / 1mol O₂) = 1.38 moles of H₂

As there are 4.96 moles,

Answer:

B. Mixture

because air,sea water and alloy are example of Mixture

Answer:

Draw a data table (search if you are unsure) and you then have to draw an atom diagram, make sure to label it, then submit your work.

Answer:

D. 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,5s2,5p6

Explanation:

Hello!

In this case, since the standard iodine atom has 53 electrons, when it forms the iodide ion it is known it gains one spare electron so now it has 54; it means we need to write the new electron configuration up to 54 as shown below:

[tex]I^-:1s^2,2s^2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^{10},5p^6.[/tex]

Thus, the answer should be:

D. 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,5s2,5p6

Even when the order is not the adequate one.

Regards!

Answer:

1s2,2s2,2p6,3s2,3p6,4s2, 3d10,4p6,5s2,4d10,5p6 is techically more correct, but in this case the closest answer given by the problem is D.

Explanation:

Note that in thereory, 4s2 is before 3d10 and 5s2 is before 4d10. However, this is not one of the choices, so the answer is D.

Yes

When molten, sodium chloride is separated into its ions. These ions can carry a charge which means that sodium chloride can conduct electricity.

Answer:

Mass = 0.37 g

Explanation:

Given data:

Number of moles of sulfur = 11.9 mol

Mass of sulfur in 11.9 mol = ?

Molar mass of sulfur = 32.06 g

Solution:

Number of moles = mass/molar mass

by putting values,

11.9 mol = mass/ 32.06 g/mol

Mass = 11.9 mol × 32.06 g/mol

Mass = 0.37 g

Answer:

16.74×10²³ atoms

Explanation:

Given data:

Number of moles of X = 2.78 mol

Number of atoms = ?

Solution:

According to Avogadro number.

1 mole of any substance contain 6.022×10²³ atoms. Thus,

2.78 mol × 6.022×10²³ atoms / 1 mol

16.74×10²³ atoms

The number 6.022 × 10²³ is called Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Answer:

Linus Pauling became known as the founder of molecular biology due to his discovery of the spiral structure of proteins (Taton, 1964)

Explanation:

Answer:

32.9%

Explanation:

The mass of water present in the original sample can be calculated by the substraction:

The percent by mass of water can be calculated with the formula:

Answer:

C) 3

Explanation:

Given data;

Number of moles of oxygen produced = ?

Moles of KClO₃ decomposed = 2 mol

Solution:

Chemical equation;

2KClO₃      →      2KCl + 3O₂

Now we will compare the moles of KClO₃  with  O₂

                        KClO₃           :           O₂

                           2                :            3

Thus, 3 moles of oxygen are produced.

Answer:

The calculator shows 2280.3972, which rounds off to 2280, three significant figures. In scientific notation, this answer would be 2.28 x 103. Note this last use of scientific notation to indicate significant figures where otherwise you might not realize they were significant.

Explanation: I hope my answer has come to your help. God bless and have a nice day ahead!

Answer:

?????/????

Explanation:

your answer is A 1000%

Answer:

LED bulbs fit standard light sockets and are the most energy-efficient option. LEDs have lower wattage than incandescent bulbs but emit the same light output. This allows them to produce the same amount of light but use less energy. LEDs can last over 20 years and don't contain mercury

Answer:

(A) and (D)is the correct answer

Explanation:

(A) in terms of electronic concept and (D) in terms of classical concept

coz you know

hope, it helps.......

Answer:

A. It gives up electrons

Explanation:

on PLATO

I got 5 out of 5 on quiz

Answer:

d.Na

...................

Answer:I believe it’s because of the volcanos making up the ring

Explanation: