. Chalk is made of CaCO​ 3​ . How many molecules are in 5 grams of chalk?

Answer: Stomata allow CO2 to diffuse and can close to minimize water loss. Liverwort pores allow gas exchange and cannot be closed if conditions become dry.

Explanation:

In the kingdom plantae, the liverworts belong to the phylum Bryophyta. A liverwort has a simple structure, ribbon- like body, that lies flat on the ground and is attached to the soil by many rhizoids. They grow in damp places on land and are capable of controlling gaseous exchange through the pores found on their leaf surfaces. Liverworts are non- vascular plants therefore they lack stomata. Unlike the stomata of vascular plants which close in dry weather, the air pores of liverworts remain open all the time. Liverworts cannot control their water loss (transpiration) through the pores.

Stomata are found in the epidermal layer of leaves in vascular plants. The opening and closing of stomata, through the help of the guard cells, control the flow of gases in and out of the leaves. This control is necessary to prevent excessive loss of water as vapour from the plant body throughout transpiration. Changes in the solute concentration of the guard cells cause water to flow in and out of the leaf epidermal cells.

Therefore, to COMPARE the stomata with pores of liverworts, they both allow gaseous exchange but in CONTRAST, stomata has the ability to control water loss as it can open and close while the pores lack this ability.

Answer:

chemical formula

Explanation:

Answer:

because it is

Explanation:

simple

Answer:

Explanation: none

Answer: Yes you are.

Explanation:

A deep teeth cleaning can remove a buildup of plaque and tartar on your teeth, reducing gum inflammation and improving gum health. Plaque is a sticky film that forms on teeth. It contains bacteria and develops when food particles mix with saliva. You can remove plaque, which collects on teeth daily, by brushing your teeth.

Answer:

The answer is relevant.

Scientific investigations must be well relevant to be sure the data collected will help answer the scientist's question.

A scientific investigation is an investigation that is done in the field of science. This unravels the secrets of the earth and the logical reason behind the things happening.

There are three types of scientific investigations. They are descriptive investigation, comparative investigation, and experimental investigation. When we see a thing happening in the environment or anywhere, always find a reason behind it.

The steps in completing a scientific investigation are:

Thus, the scientific investigations must be well relevant to the data.

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Answer:

the amount of soduim phosphate is will be 52 percemt

Answer:

Option d)3.32 g is correct.

Explanation:

hope this helps

In this exercise we have to use the knowledge of lunar eclipse to identify the alternatives that correspond to this effect, as follows:

A lunar eclipse happens when the Earth is between the Moon and the Sun, at times when they are aligned. Depending on the position of the Moon, it is total, partial or penumbral. Different stages of a lunar eclipse on a full moon night.

Now,  use the knowledge of solar eclipse to identify the alternatives that correspond to this effect, as follows:

Solar eclipse is an astronomical phenomenon that occurs when the Moon is positioned between the Earth and the Sun, hiding the light emitted by the star towards the planet.

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Answer: yes

Explanation:

Answer:

It is a living plant

Explanation:

Answer:

1. 58.5g/mol

2. 261g/mol

3. 158g/mol

4. 71g/mol

5. 44g/mol

Explanation:

The molar mass of a compound is the total mass of the sum of masses of all individual elements that make up the compound. First, we need to know the atomic masses of each element in a compound.

1. NaCl

Where; Na = 23, and Cl = 35.5

Molar mass of NaCl = 23 + 35.5

= 58.5g/mol

2. Ba(NO3)2:

Where; Ba = 137, N = 14, O = 16

Molar mass of Ba(NO3)2: 137 + {14 + 16(3)} 2

137 + (14 + 48)2

137 + (62)2

137 + 124

= 261g/mol

3. K(MnO4)

Where; K = 39, Mn = 55, O = 16

Molar mass of KMnO4 = 39 + 55 + 16(4)

= 94 + 64

= 158g/mol

4. Cl2

Where; Cl = 35.5

Molar mass of Cl2 = 35.5(2)

= 71g/mol

5. CO2

Where; C = 12, O = 16

Molar Mass of CO2 = 12 + 16(2)

= 12 + 32

= 44g/mol

Answer:

H, Ca, Cl is the answer dude

Answer:

hydrogen is H

calcium is Ca and chlorine is Cl

Answer:

the correct answer is D) a decrease in decrease in temperature

have a good day! :)

Explanation:

The factor that decreases the rate of solution is a decrease in temperature. Details about rate of a solution can be found below.

A solution is a homogeneous mixture, which may be liquid, gas or solid, formed by dissolving one or more substances.

The rate at which a solution moves can be affected by the following:

This means that the factor that decreases the rate of solution is a decrease in temperature.

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The statement that describes a hydrogen bond is the bond between hydrogen in one water molecule and another hydrogen in a different water molecule. The correct option is b.

Hydrogen bonds are the bonds that are formed between water molecules and other molecules that join with hydrogen. These are weak bonds. This bond is formed between hydrogen atoms and other atoms.

One of the bonds that allow molecules to associate is the hydrogen bond. It happens when hydrogen forms a covalent bond with an element that is extremely electronegative, such as oxygen, nitrogen, or sulfur.

Thus, the correct option is b) the bond between hydrogen in one water molecule and another hydrogen in a different water molecule.

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Answer:

true

Explanation:

tvyvyvtvtvtbbtbb

Answer:

e. 327/227

Explanation:

This is the correct standard pressure.

Explanation:

answer is A cell membrane

( you are bad at biology too anyways that's just a joke)

Answer:

480 mL

Explanation:

15L  of  0.38M of NH3(aq.) means that we require 15x0.38 moles of NH3.

this is to be provided by 15M x V.  

Where V is volume in Liters.

These are equal  

⇒15M x V = 15x 0.48  

Hence, Volume required V = 0.48L =480mL

Answer:

Temperature, heart rate and blood flow.

Explanation:

The three things that our body strives to keep constant in overall body aspect are Temperature, heart rate and blood flow.

A slight disturbance in any of the life processes disturbs the entire functioning of the body.

Therefore ,

The Three things that our body strives to keep constant in overall body aspect are Temperature, heart rate and blood flow.

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Answer:

ver explicacion

Explanation:

Los orbitales híbridos se obtienen mediante una combinación de orbitales atómicos.

En un átomo de carbono con hibridación sp3, el átomo de carbono es tetraédrico con un ángulo de enlace de 109,5 grados. Se pueden unir cuatro enlaces simples al átomo de carbono. Se pueden unir un total de cuatro átomos al carbono. Se puede unir un total de cuatro átomos al carbono, lo que ocurre en alcanos como el metano

Para un átomo de carbono con hibridación sp2, hay dos enlaces dobles y dos enlaces simples unidos al átomo de carbono que tiene una geometría plana trigonal con un ángulo de enlace de 120 grados. Se pueden unir un total de dos átomos al carbono. Se pueden unir un total de dos átomos al carbono. Esto ocurre en alquenos como el eteno.

Un átomo de carbono con hibridación sp tiene un ángulo de enlace de 180 grados y tiene una geometría lineal con un enlace triple y un enlace sencillo. Solo se puede unir un átomo al carbono. Esto ocurre en alquinos como el etino.

Answer:

Bycatch can negatively affect species such as dolphins, sea turtles, protected fish, and whales by harming animals, contributing to population declines, and impeding population recovery. Other impacts of fisheries on marine mammals may include removal of their preferred prey and sometimes habitat damage.

Explanation: hey could i get to kno u or sum

False. To prepare 20.0 mL of 2.00 M solution of hydrochloric acid from 10.0 M stock solution, 4.0 mL of the stock solution and 16.0 mL of water would be needed.  

Recall the law of diffusion that:

C1V1 = C2V2, where C1 = initial concentration, V1 = initial volume, C2 = final concentration, and V2 = final volume.

In this case, if C1 =10.0 M, V1 = ?, C2 = 2.00 M and V2 = 20.0 mL

V1 = 2 x 20/10

         = 4.0 mL

Hence, 4.0 mL of the stock solution would be taken. Since the final volume is 20.0 mL, only 16.0 mL of water would need to be added and not 20.0 mL.

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Answer:

A palavra 'composto' também vem do latim, e significa literalmente 'compor' alguma coisa. Então esta é a composição que podes ver no frasco à direita. O composto é uma composição de todos os tipos de substâncias orgânicas que se decompõem com o tempo e se tornam húmus. O húmus é uma unidade homogênea.

Explanation:

Answer:

below...

Explanation:

The main difference between Compost and Humus is that the Compost is a organic matter that has been decomposed and recycled as a fertilizer and soil amendment and Humus is a any organic matter that has reached a point of stability.

Answer:

The circulatory system

Explanation:

Answer:

4) KOH

Explanation:

Trust

0.1 M KOH has a pH greater than 7.

The pH of a solution is a measure of hydrogen ion (H+) concentration, which is, a measure of acidity.

The  pOH of a solution is measure of hydroxide ions (OH).which is a measure of basicity.

The pH of

∴According to the question the pH greater than 7 is KOH

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Answer:

We know that 18 g of H2O contains 1 mole (or 6.022 x 10^23) molecules of water because the molar mass of H2O is 18 g/mol.

So 1 g water will contain 1/18 moles of H2O molecules.

Now 15 g of water will contain 15/18 moles of H2O.

So molecules of H2O = (15/18) x 6.022 x 10^23 = 5 x 10^23 molecules.

Explanation:

I learned this in science hope this helps.

Answer:

c

Explanation:

I looked the answer up it said it was geosphere

Answer:

the answer is geosphere

Explanation:

i hope it helps you

Answer:

b

Explanation:

Answer:

B) 4,1,2,3

Explanation:

Did it on USA Test prep. :)