PLEASE HELP!!!
Which of the analogies best describes a Bohr model of an atom?
A. A Bohr model is like a bowling ball because they are both solid spheres.
B.A Bohr model is like a model of the solar system because they both show orbits around a massive center
C. A Bohr model is like a string of beads because they both contain small parts that are lined up in a row.
D. A Bohr model is like a jigsaw puzzle because they are both made up of small parts that are all joined together.

Answer:

Nitrogen

Explanation:

because a rule i use called the "en,ne" rule

Any element that ends with this is diatomic

Answer:

the correct answer is A

Explanation:

Cold water causes a strong reaction between all alkali metals. Each reaction results in the release of hydrogen gas and the production of metal hydroxide.

The six chemical elements that make up Group 1 ( Ia ) of the periodic table—lithium ( Li ), sodium ( Na ), potassium ( K ), rubidium ( Rb ), cesium ( Cs ), and francium—are together referred to as alkali metals ( Fr ). The name "alkali metals" refers to how they react with water to produce alkalies.

The elements in Group 1 are all extremely reactive. To protect them against air and water, they must be kept under oil when being stored. Group 1 elements produce alkaline metal hydroxides when they interact with water (with a pH above 7). They are known as "alkali metals" for this reason.

Thus, the elements in group 1 react with water to form a hydroxide and hydrogen gas is produced.

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Answer:

Chalcopyrite

Explanation:

Pure magnetite contains 72.4 percent iron, hematite 69.9 percent, limonite 59.8 percent, and siderite 48.2 percent,

Answer:

[tex]\boxed {\boxed {\sf B. \ Iodine }}[/tex]

Explanation:

Atomic radius is the measurement from the nucleus to the outer edge of the electron cloud.

As you go down a group (vertically) the atomic radius increases because more electron shells are added. As you go across a period horizontally, the atomic radius decreases.  

If we look at the halogens group (17), we see they follow this order from top to bottom:

F - Fluorine

Cl - Chlorine

Br - Bromine

I - Iodine

Since it increases down the group, iodine  must have the largest atomic radius.

Explanation:

D) chlorine kills most pathogens in water.

The mass of boy weighing 270 N has been 27.55 kg.

The mass of the object has been determining the quantity of the matter, while weight of the object has been the mass with the gravitational pull.

The weight of the object has been given as:

Weight = mass × gravitational constant

Weight of boy = 270 N

Gravitational constant = 9.8

The mass of boy is:

270 = mass × 9.8

[tex]\rm Mass\;=\;\dfrac{270}{9.8}[/tex]

Mass = 27.55 kg.

The mass of boy weighing 270 N has been 27.55 kg.

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Answer:

1s2 2s2 2p6 3s2 3p6 4s2 3d6

Explanation:

Answer:

Molar Mass: 138.9818 g/mol

Explanation:

Answer:

Gravity

Explanation:

i dont rlly know where it comes from...

Burrows, tracks, coprolites, nests and footprints are examples of traces that can be found in a fossil.

Answer:

motion

Explanation:

Answer:

They mask the recessive alleles

Answer:Land Population

Answer:

[tex]\boxed {\boxed {\sf A. \ 19,320 \ kg/m^3}}[/tex]

Explanation:

We want to find the density. The formula is mass over volume.

[tex]\rho = \frac{m}{v}[/tex]

The mass is 500 kilograms. The volume is 0.026 cubic meters.

[tex]m= 500 \ kg \\v=0.026 \ m^3[/tex]

Substitute the values into the formula.

[tex]\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}[/tex]

Divide.

[tex]\rho = 19230.7692 \ kg/m^3[/tex]

This is just about equal to 19,320 kg/m³, so choice A is correct.

Answer:

A) 19230 kg/ m3

Explanation:

divided it's mass by its volume ti get it's density

500/0.026 = 19230

Answer:

smoother and less jagged

Explanation:

Answer:

There is more space in a balloon with less gases meaning it can move around a lot faster

Explanation:

Answer: Trade winds!

Explanation:

Answer:

B

Explanation:

Blue triangles are a cold front and red bowls are warm front

Stationary front is a combination

HOPE I helped :]

Answer:

stationary front

Explanation:

on a weather map, a stationary front is shown as alternating red semicircles and blue triangles like in the image at the left. notice how the blue triangles point in one direction, and the red semicircles point in the opposite direction.

Answer: O D. It bonds with the added H+ or OH in solution.

Explanation:

Answer:

I think the answer is A sorry if I am wrong :c

A Brønsted-Lowry base is a species that accepts H⁺ ions (A).

It is an acid-base theory.

What is true of a Brønsted-Lowry base?

A. A Brønsted-Lowry base accepts H⁺ ions. True.

B. A Brønsted-Lowry base donates electrons. False. This is a Lewis base.

C. A Brønsted-Lowry base donates OH⁻ ions. False. This is an Arrhenius base.

D. A Brønsted-Lowry base accepts OH⁻ ions. False. This is not part of any acid-base theory.

A Brønsted-Lowry base is a species that accepts H⁺ ions (A).

Learn more about Brønsted-Lowry acid and bases here: https://brainly.com/question/7256753

Answer:

chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface

Answer:

Option D.

Explanation:

Let's balance the hole reaction by the ion electron method.

Al (s) + Cr(NO₃)₂ (aq) – Cr (s) + Al(NO₃)₃ (aq)

We know that oxidation state at ground state is 0.

We determine the half reactions:

Al  ⇆   Al³⁺  +  3e⁻

Aluminum increase the oxidation state. This is the oxidation.

Cr²⁺ + 2e⁻  ⇄   Cr

Chromium decrease the oxidation state. It changed from +2 to 0.

This is the reduction. In order to balance the half reactions, we need to multiply by 2 and by 3. In that way, we can cancel the electrons:

(Al  ⇆   Al³⁺  +  3e⁻) . 2

(Cr²⁺ + 2e⁻  ⇄   Cr) . 3

We sum the half reactions:

2 Al + 3 Cr²⁺  +  6e⁻  ⇄  2Al³⁺  +  6e⁻ + 3Cr

We cancel the electrons, so now the balanced reaction is:

2Al + 3Cr(NO₃)₂  →  3Cr  + 2Al(NO₃)₃

Final answer: 6 electrons are transferred in the redox reaction.