Really need help with the rest of them, please it's due in 20 minutes

Answer:

3

Explanation:

pH+pOH=14

Answer:

B

Explanation:

Generally, when you dilute something, your goal is to thin your concentration. Even if you added a solute, if your goal is dilution, it will make the concentration decrease.

Answer:

Lungs.

Explanation:

They bring the blood throughout the body, to help it function properly

Answer:

P waves travel faster than other waves

Explanation:

P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.

Answer:

false the answer is woody

Explanation:

those are the two types of stems

Answer:

hi.

Explanation:

1. B

2. C

3. A

4. B

5.B

hope this helps

Answer:

yes I know it.

Explanation:

A:positive terminal

B:cathode

C:electrolyte

D:anode

E:negative terminal

Thank you for this question

Answer: Yes, light can bend around corners. ... The ability of light to bend around corners is also known as "diffraction". There are two mechanisms that cause light to bend around corners. Light waves indeed bend around corners because of diffraction, as shown in this illustration.

Explanation:

Answer:

150 moles (2 sig. figs.)

Explanation:

to convert from ...

grams to moles => divide by formula weight

moles to grams => multiply by formula weight

this problem:

Given mass of Iron (Fe) = 8200g

formula wt of Fe = 56g/mole

moles = mass/formula wt = 8200g / 56g/mol = 146.42857 moles (calculator) = 150 moles (2 sig. figs.)

The number of moles in 8200 grams of iron is 57.69 moles of Fe.

Mole is defined as the amount of the substance containing the same number of discrete entities (atoms, molecules, ions, etc) as there are atoms in a sample of pure 12C weighing exactly 12g.

The number of particles present in one mole of any substance  is Avogadro Number and is equals to 6.023 x 10²³ particles.

Given ;

To find ;

Formula used :

             =  8200 / 56   (atomic weight of Fe = 56 gm)

             = 157.69 moles of Fe.

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Answer:

For an electron they start at the first level (n=1) In order to move up to the next level (n=2) the amount of quantom energy to move to this next level the energy must be perfect in order to move. If the quantom energy is to small the electron it doesn't try.

Earth climate has stayed same thougout the past

Explanation:

6. Which type mixture does not allow light to shine through?

D) Suspensions

10. What is a closed system in chemical equilibrium?

Solution:

-TheUnknownScientist

Answer:

666.93 kJ

Explanation:

Using the formula;

Q = m × c × ∆T

Where;

Q = amount of heat absorbed (Joules)

m = mass of substance (g)

c = specific heat capacity (4.184 J/g°C)

∆T = change in temperature (°C)

Based on the information provided in the question;

Q = ?

m = 2000g

∆T = 99.7 °C - 20 °C = 79.7 °C

c = 4.184 J/g°C

Using Q = m × c × ∆T

Q = 2000 × 4.184 × 79.7

Q = 666929.6 Joules

To calculate the amount of heat absorbed (Q) in kilojoules (kJ), we say;

1 joule = 0.001 kilojoule

666929.6 Joules = 666929.6 × 0.001

= 666.9296 KJ

Approximately, Q = 666.93 kJ.

Answer:

B

Explanation:

Answer:

Explanation: The goal of every country should be to produce more materials and goods

Answer:

Is there a way you can give a answer made for a 5th grade

Explanation:

Answer:

its getting colder

Explanation:

Answer:

Heeeeeeeeeeeeeloooooooooo

Explanation:

4) H+ions is your answer , good morning , have a great day ahead.

Answer:

Hi ,

Answer:

A chemical energy is changed to a electrical energy

Answer:

it's about changing attitudes and behavior.

Answer:

1. 10

Explanation

when litmus paper is blue that means the solution is basic and 10 on the pH scale is the most basic out of all your options

Answer:

Explanation:

Explanation: It's a 3.0 M solution so 1 litre of solution contains 3 moles of NaOH. 250 ml of solution therefore contains 0.25 x 3 = 0.75 moles of NaOH. The molar mass of NaOH is 39.9971 g/mol, so 250 ml of this solution contains 0.75 x 39.9971 = 29.99 g, or if you round it up 30.0 g.

30g of NaOH is in 250 mL of a 3.0M NaOH solution​.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Volume of NaOH = 250 ml

Concentration = 3M

number of moles = concentration × volume (L)

= 3 × 0.25

= 0.75 moles

mass = moles × molar mass

= 0.75 × 40

= 30 g

Therefore, 30g of NaOH is in 250 mL of a 3.0M NaOH solution​.

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Answer:

Explanation:

Option C is the correct answer

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the correct option is option C.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.

There is a relation between energy of wave. frequency of wave, and wavelength of wave

Mathematically,

E=hc/λ

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

c is speed of light that is 3×10⁸m/s

λ is the wavelength of electromagnetic wave

An electromagnetic spectrum refer to a range of wavelengths of light that increases from one end to the other.

Therefore, the correct option is option C.

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Answer:

b

Explanation:

Answer:

Scientist 3

Explanation:

Answer:

it's not clear

Explanation:

.