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4 years ago

Which statement about subatomic particles is NOT true?

Chemistry

2 answers:

Charra [1.4K]4 years ago

7 0

Neutrons have no charge while protons are positively charged. D is the right choice

Bingel [31]4 years ago

3 0

Answer:

Protons and neutrons have the same charge.

Explanation:

The protons and neutrons are the subatomic particles present in the nucleus of an atom while the electrons are present in the outer shells.

The charge on protons is positive

Neutrons are neutral.

electrons are negatively charges

Electrons are very light as compared to protons and neutrons while protons and neutrons are almost of same weight.

So based on above facts, the false statement is

Protons and neutrons have the same charge.

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The a-helices and b- sheets in protein make up its

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Alpha helix and beta sheets are the secondary structure of protein

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3 years ago

Calculate the number of grams of solute in 500.0 mL of 0.189 M KOH.

KIM [24]

Answer : The number of grams of solute in 500.0 mL of 0.189 M KOH is, 5.292 grams

Solution : Given,

Volume of solution = 500 ml

Molarity of KOH solution = 0.189 M

Molar mass of KOH = 56 g/mole

Formula used :

$Molarity=\frac{\text{Mass of KOH}\times 1000}{\text{Molar mass of KOH}\times \text{Volume of solution in ml}}$

Now put all the given values in this formula, we get the mass of solute KOH.

$0.189M=\frac{\text{Mass of KOH}\times 1000}{(56g/mole)\times (500ml)}$

$\text{Mass of KOH}=5.292g$

Therefore, the number of grams of solute in 500.0 mL of 0.189 M KOH is, 5.292 grams

7 0

3 years ago

Read 2 more answers

Change for a liquid state to a solid state is known as what phase change?

NeTakaya

Answer:

B. To change from a liquid state to a solid state is called Freezing

5 0

3 years ago

Read 2 more answers

If a 0.320 mM solution of MnO41- has an absorbance of 0.480 at 525 nm in a 1.000 cm cell. What is the concentration of a MnO41-

larisa [96]

Answer:

Hence the concentration of a MnO41- solution that has absorbance of 0.490 in the same cell at that wavelength is 0.3266.

Explanation:

Now A = el, el=const

Then,

$A2 / A1 = C2/ C1\\\\0.49/ 0.48 = C2 / 0.32\\\\C2 = 0.3266$

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3 years ago

What is the only thing held constant in a combined gas law problem?

vodomira [7]

Only the amount of gas is held constant.

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3 years ago