Plz help me with these three please please !!!!!

Answers

Answer 1

Explanation:

Cations are positively charged ions with fewer electrons than protons. To partake in reaction, metals lose electrons to achieve a stable octet configuration. It has lost valence electrons and wold have a positive charge associated with it.

Potassium is a group 1 element. A metal.

Potassium has 1 valence electron so it loses the valence electron to form a stable octet.

A potassium ion has a positive charge and therefore cannot be an anion but is a cation.

The group number pretty much denotes the number of valence electrons.

Group 1 = 1

Group 2 = 2

Group 17 = 7

Group 18 = 8

Related Questions

Find the amount of atoms from 128 grams of NaCl?

Answers

Answer:

13.25 ×10²³ atoms

Explanation:

Given data:

Mass of NaCl = 128 g

Number of atoms = ?

Solution:

First of all we will calculate the number of moles of NaCl.

Number of moles = mass/molar mass

Number of moles = 128 g/ 58.4 g/mol

Number of moles = 2.2 mol

Number of atoms:

1 mole of any substance contain 6.022×10²³ atoms.

2.2 mol × 6.022×10²³ atoms / 1mol

13.25 ×10²³ atoms

What is the mole ratio of water (H20) to phosphoric acid (H3PO4)?
P.010 + H2O 4H3PO4
Before
After
Р
4
(4) - 4
4(4) - 16
O 10+1
H
2
3(4) - 12
1:1
46
6:4
2:2

Answers

Answer:

the answer to this problem is before

Explanation:

Calculate the average atomic mass for an imaginary element "E" that has the following isotope abundances:
56.67 % E-102.658 amu
43.33% E-104.770 amu

Answers

Answer:

Average atomic mass of E = 103.57 amu

Explanation:

Given data:

Average atomic mass of E = ?

Abundance of E-102.658 = 56.67%

Abundance of E-104.770 = 43.33%

Solution:

Average atomic mass of E = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100

Average atomic mass of E = (56.67×102.658)+(43.33×104.770) /100

Average atomic mass of E = 5817.63 + 4539.68 / 100

Average atomic mass of E = 10357.31 / 100

Average atomic mass of E = 103.57 amu.

explain isotope with hydrgen diagram

Answers

Answer:

Hydrogen has three naturally occurringisotopes: 1H (protium), 2H (deuterium), and 3H (tritium). Other highly unstable nuclei (4H to 7H) have been synthesized in the laboratory, but do not occur in nature. The most stable radioisotope ofhydrogen is tritium, with a half-life of 12.32 years.

Explain why chlorine (Cl2) is a gas at room temperature,
but sodium chloride (NaCl) is a solid at room
temperature.
Include description of the bonding and structure of chloride and sodium chloride in your answer

Answers

Answer:

The melting/boiling point of a substance determines what state of matter it takes at a certain temperature.

In Cl2 there are covalent bonds between the atoms forming simple molecules. There are weak attractions between molecules of Cl2 meaning little energy is needed to break these forces of attraction and therefore Cl2 has a low boiling point.

NaCl on the other hand has strong electrostatic forces of attraction between the positvely charged Na ion and the negatively charged Cl ion. NaCl forms a giant ionic lattice that requires high amounts of energy to break and therefore has a high melting point.

_____ is responsible for bringing gravity into modern science.

Isaac Newton

Galileo Galilei

Albert Einstein

Answers

Isaac Newton is the answer

How many Joules of heat are required to melt 250 grams of ice at 0°C?
AHfus = 334 J/g
AHvap = 2258 J/g
Cp= 4.184 J/g C

Answers

Heat required : Q = 83500 J = 83.5 kJ

Further explanation

Given

mass ice = 250 g at 0°C

Required

The heat required

Solution

The heat to change the phase can be formulated :

Q = m.Lf (melting/freezing)

Lf=latent heat of fusion

Input the value :

Q = 250 g x 334 J/g

Q = 83500 J

Although I am in the middle of the 5 stages, I am just as important
as the first and the last. As soon as you see a leaf sprout, you are
sure to be in my stage. Who am I?

This is annoying

Answers

Answer: The final stage of the life cycle of a tree is when it has fully grown and reached the ... You should be confident in your supplier's approach to sustainability. ... This is the first occasion you will see a stem and perhaps a couple of leaves. ... The next phase is the sapling stage, this is when the sprout continues to grow and has ...

Explanation:

I need help...................

Answers

With what? There’s no question or photo

Enter the correct 4 digit code (no spaces)

Answers

3618 is the numbers for the graph

pls don't answer if you done know. Which of the following best describes what would happen if mitosis did not take place?

A.Cells would get smaller and smaller over time.

B.Body tissues would not be able to repair themselves

C.The production of gametes (reproductive cells) would not occur

D.Organisms would all be multicellular.

pls help i really need this answer

Answers

Answer: B

Explanation:

Which of the following best describes the movement of particles in a solid?
O A. Particles can vibrate slightly, but are unable to move around.
O B. Particles move past each other freely.
O C. Particles travel at high speeds in all directions.
O D. Particles travel at low speeds in all directions.

Answers

Answer:

Explanation:

particles are frozen and hence will vibrate in their fixed positions

A sample of nitrogen gas contains 8.23 x 10^23 molecules. What is the volume of this sample at STP?

Please show and explain the steps.

Answers

Answer:

30.6 L

Explanation:

Given data:

Number of molecules of nitrogen = 8.23×10²³ molecules

Volume occupy at STP = ?

Solution:

Standard temperature = 273.15 K

Standard pressure = 1 atm

One mole of any substance at STP occupy 22.4 L volume.

Number of moles of nitrogen:

1 mole contain 6.022×10²³ molecules.

8.23×10²³ molecules × 1mol / 6.022×10²³ molecules

1.37 mol

Volume of nitrogen:

1.37 mol × 22.4 L / 1 mol

30.6 L

Do the reactants or products contain more energy in the
decomposition reaction of sodium azide?

Answers

Answer:

reactants contain more energy in the decomposition reaction of sodium azide?

Explanation:

7. Although carbon's three isotopes are carbon-12, carbon-13, and carbon-14, its
average atomic mass is 12.01 because

A. carbon-12 is the heaviest isotope.

B. carbon-12 is most useful to humans.

C. carbon-12 is the most common isotope.

Answers

Answer:

Explanation:

carbon 12 is most useful to humans

There have been made 2 attempts of oxygen production by potassium permanganate.In the first attempt they have got 75ml oxygen in 3 minutes whearas there have been got 100ml in 5 minutes by the 2nd attempt.In what case the speed of the oxygen production is bigger???
Pls explain your answer

Answers

Answer:

The speed of oxygen production is bigger in the first attempt.

Explanation:

In the first attempt, since 75ml oxygen is produced in 3 minutes, the rate of oxygen production is r = volume of oxygen/time = 75 ml/3 min = 25 ml//min

In the second attempt, since 100ml oxygen is produced in 5 minutes, the rate of oxygen production is r' = volume of oxygen/time = 100 ml/5 min = 20 ml//min

Since r = 25 ml/min > r' = 20 ml/min, the speed of oxygen production is bigger in the first attempt.

Name the type of chemical reaction.

NaBr + H3PO4 → Na3PO4 + HBr

Answers

Answer:

double displacement (metathesis) hope that helps!(^_^メ)

Explanation:

meh.

Which describes an example of ecological succession?

Answers

Answer:

b. a meadow replacing a pond in it's flood plain

Explanation:

I'ts a secondary succession.

1. How much taller is the average person today than the average person 100 years ago?

A. 1 inch

B. 2 inches

C. 5 inches

D. 10 inches

Answers

5 inches I am not sure but I THINK it’s 5 inches sry if I’m wrong

please answer this for me shehsh

Answers

Answer:

ih2706

Explanation:

PLEASE ASAP
Determine the mass, in grams, for 1.20e24 molecules of H₂

Answers

Answer:

3.98g

Explanation:

Given parameters:

Number of molecules = 1.2 x 10²⁴ molecules

Unknown:

Mass of H₂ = ?

Solution:

To find the mass of this molecule, we use the expression below:

Mass = number of moles x molar mass

Molar mass of H₂ = 2(1) = 2g/mol

6.02 x 10²³ molecules are contained in 1 mole of a substance

So; 1.2 x 10²⁴ molecules will have [tex]\frac{1.2 x 10^{24} }{6.02 x 10^{23} }[/tex] = 1.99 moles of H₂

Mass of H₂ = 1.99 x 2 = 3.98g

I'm not sure how to do this

Answers

Search the full forms of those and then check how many molecules

What is the oxidation number for Ba?
A. +1
B. -2
C. +2
D. -1

Answers

Answer:

Explanation:

Ba is present in group 2 and group 2 show + oxidation state

Heelllpp.!!

How many moles are in 78 grams of Chlorine
gas (CI)?

Answers

Answer:

Grams of chlorine gas to moles

The SI base unit for amount of substance is the mole. 1 grams Chlorine is equal to 0.028206357713029 mole.

Explanation:

There are 2.2000859 moles.

why sometimes the electrons of an atom transfer to higher energy level

Answers

Answer:

According to Bohr, the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. ... The electron with its extra packet of energy becomes excited, and promptly moves out of its lower energy level and takes up a position in a higher energy level. This situation is unstable, however.

_____of gas molecules with an object is the cause of
pressure by a gas.

Answers

Answer:

Gas Pressure

Explanation:

Gas pressure is caused by the force exerted by gas molecules colliding with the surfaces of objects (Figure 5.2. 1). Although the force of each collision is very small, any surface of appreciable area experiences a large number of collisions in a short time, which can result in a high pressure.

Answer:

Collisions

Explanation:

It says that it was the answer.

3. Why have we not been able to create a fusion reactor on Earth?

Answers

Answer:

We are not able to create a fusion reactor on Earth because fusion energy production is not based on a chain reaction, as is fission. Plasma must be kept at very high temperatures with the support of external heating systems and confined by an external magnetic field.

Explanation:

Because fusion only occurs at very high temperature (in the centre of a star). That is accomplished in a start because of its great mass creating massive pressure and temperatures. This is extremely hard to recreate on earth.

SOMEONE PLS HELP ASAP!!

Which pair of objects will have the least gravitational attraction to each other?
Group of answer choices

Two marbles 12 centimeters apart.

A cinderblock and marble 6 centimeters apart.

A cinderblock and marble 12 centimeters apart.

Two cinder blocks 6 centimeters apart.

Answers

Answer:

Two cinder blocks 6 centimeters apart

Explanation:

im not 100% certain but the 2 cinder blocks are more dense than the other options

sry if its wrong

WILL GIVE BRAINLIEST!!

A magnetic globe is being held down on a base. When released, the globe rises above the base and eventually comes to rest floating above the base.

In which position shown does the globe have the greatest magnetic potential energy?

Answers

Answer:

It is position 3

Explanation:

Because the further the magnets are the higher the potential energy, and in position 3 the globe is the furthest from the base meaning that in base 3 the magnetic potential energy is the highest or greatest there.

If a 6N weight is hung on a spring, and it extends by 0.2m, what is the spring constant (k)? What do you think the units are?

Answers

Answer:

K = 30N/m

Explanation:

We use this equation:

F= k∆x

Where ∆x refers to the amount or stretch or compression and k is the spring constant.

F = force

k = spring constant

∆x = change in length of spring

We don't know the value of k, so we make k the subject:

k = F/∆x

k = 6N x 0.2m

k = 30N/m

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