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3 years ago

Does anyone want free point? Just comment whatever٩(ˊᗜˋ)و

Chemistry

2 answers:

Vsevolod [243]3 years ago

7 0

Answer:

agh thanks bestie for the points have a great day

Explanation:

olga2289 [7]3 years ago

3 0

Answer:

ddddddddddddddddddddddddddddddddd

Explanation:

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Me=9.11×10to the -31 power

weqwewe [10]

True

Explanation:

The mass of an electron is 9.11 x 10⁻³¹kg. It is the lightest subatomic particle compared the protons and neutrons.

Protons weighs 1.67 x 10⁻²⁷kg

Neutrons weighs 1.68 x 10⁻²⁷kg

Electrons carry negative charges.
They were first discovered by J.J Thomson where he called them cathode rays.
They occupy the regions in space around the nucleus.
The regions consists of orbitals and are called sublevels or subshells.

learn more:

Subatomic particles brainly.com/question/2757829

#learnwithBrainly

3 0

3 years ago

Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?

irinina [24]

Answer:

<h2>Krypton is a halogen, so it should be kept secret because it is so reactive and toxic. Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.</h2>

Explanation:

<h2>PLEASE MARK ME BRAINLIEST AND FOLLOW M E LOTS OF LOVE FROM MY HEART AND SOUL DARLING TEJASWI HERE ❤️</h2>

7 0

3 years ago

Read 2 more answers

Use Table 1: Analysis of Decay in the laboratory guide to answer this question: Scientists find a piece of wood that is thought

sashaice [31]

1/2=5750 years, 1/2(1/2)=1/4, (1/2)(1/2)(1/2)=1/8, (1/2)(1/2)(1/2)(1/2)=1/6
4 halflives have passed so 4(5750)=23000 years since the tree was chopped down
1000000 atoms (1/2)=500000 atoms(1/2)=250000(1/2)=125000(1/2)=62500 atoms would remain in the wood after 4 halflives
Dinosaurs became extinct around 62 million years ago, so if 14C's half life has a value of 5750 years, it would be gone or in such small amounts that dating would be ineffective today.
As Potassium decays into Argon in 1.3 billion years, apart from volcanic activity, it would enable geologists to effectively date things that are really, really, really old.

8 0

3 years ago

HELP URGENT PLS!1!! In what direction and how many spaces must you move the decimal point to make the following conversion?

Mama L [17]

To convert from L to ml, we move three spaces to the right and the decimal place moves three places.

Our task here is to convert 600 L to mL. we have to remember that to convert from L to ml, we have to multiply the value in L by 1000

In other words, the value 1000 is known as the conversion factor.

When we do this, we move the decimal place three places to the right to have 600000.00mL

For more about conversion factors, see:

brainly.com/question/8512113

6 0

3 years ago

Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a cataly

Lyrx [107]

Answer: 0.0285 moles of HCl is present in given amount of solution.

Explanation:

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:

$\text{Molarity of solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (mL)}}$ .....(1)

Given values:

Molarity of HCl = 0.453 M

Volume of solution = 62.85 mL

Putting values in equation 1, we get:

$0.453mol/L=\frac{\text{Moles of HCl}\times 1000}{62.85}\\\\\text{Moles of HCl}=\frac{0.453\times 62.85}{1000}=0.0285moles$

Hence, 0.0285 moles of HCl is present in given amount of solution.

4 0

3 years ago