someone plz help me.

Answer:

Malleable

Explanation:

Answer:

11.8g of CaCl₂ would be required

Explanation:

To solve this question we need to find the moles of AgNO₃ in the solution. Thus, and using the chemical reaction we can find the moles of CaCl₂ required for a complete reaction and its mass as follows:

Moles AgNO₃:

420mL = 0.420L * (0.506mol / L) = 0.213 moles AgNO₃

Moles CaCl₂:

Based on the chemical reaction, 2 moles of AgNO₃ react per mole of CaCl₂.

The moles of CaCl₂ that will react are:

0.213 moles AgNO₃ * (1mol CaCl₂ / 2 mol AgNO₃) = 0.106 moles CaCl₂

Mass CaCl₂ -Molar mass: 110.98g/mol-

0.106 moles CaCl₂ * (110.98g / mol) =

Answer:

A. "All molecules are compounds, but not all compounds are molecules"

Explanation:

An example of a compound-molecule is oxygen. The elemenal is O, because the periodic table isn't describing molecules, it's describing atoms. The molecule is O2 because it takes 2 O atoms to make a molecule of oxygen.

The primary difference between a molecule and a compound is 'compounds must be composed of more than one type of atom​'.

Explanation:

So, from this, we can conclude that the primary difference between a molecule and a compound is 'compounds must be composed of more than one type of atom​'.

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Emissions from motor vehicles increase smog in the air which can block radiation. Hence, option C is correct.

An urban area is a region surrounding a city. Most inhabitants of urban areas have nonagricultural jobs. Urban areas are very developed, meaning there is a density of human structures such as houses, commercial buildings, roads, bridges, and railways. "Urban area" can refer to towns, cities, and suburbs.

Emission from motor vehicles increases smog in the air that can block radiation, which makes sense because urbanization means more people in one area=lots of pollution.

Hence, option C is correct.

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Answer:

gas

Explanation:

Gas

Explanation:

The volume of gas varies inversely with the pressure, when temperature is kept constant.

If the amount of gas in a container is increased, the volume increases. If the amount of gas in a container is decreased, the volume decreases.

The role of the presenter in a group discussion to introduce information for the group to discuss.

A discussion involving a number of people who are connected by some shared activity, interest, or quality.

Group discussion is a tool to test your teamwork skills, listening skills, discussion ability, subject knowledge, and communication.

Intrinsic skills like reasoning, speaking and time management come in very handy.

Skills that you can work upon include presentation, summarizing and people speaking.

The purpose of a group discussion is not to win an argument or to amuse your classmates.

The purpose of a discussion is to help each group member explore and discover personal meanings of a text through interaction with other people.

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Answer:

This happened when a nutritional question was presented. When asked a nutritional question, evidence was cited from one of the above sites to back up the answer.

Explanation:

Answer:

hydrochloric acid

Explanation:

Answer:

The answers are 1:3:13

Explanation:

when I had to do these types of equations just search them up on you-tube lol theres this guy called Wayne Breslyn that does a really good job of explaining and has like the answers for any and everyy balancing equation

Answer: to copy itself during cell division

Explanation:

Answer:

C

Explanation:

The statement that best describes the influence that sexual reproduction has on genetic variation is as follows:

Thus, the correct option for this question is B.

Crossing over may be defined as a biological mechanism through which genetic material gets exchanged between the non-sister chromatids of the homologous chromosomes. The process of crossing over occurs in the Pachytene stage of mitosis.

Option C is incorrect because the process of crossing over never occurs between sister chromatids. So, it is eliminated. While options A and D are incorrect because they describe the mechanism of crossing over in the sense of meiosis which is absolutely incorrect.

Therefore,  the correct option for this question is B.

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Answer:

1.51 x 10^23 atoms of Ar

Explanation:

Start out with what you're given.

10.0 g of Ar/1 * 1 mol/39.948 g Ar * 6.022*10^23 atoms/1 mol

(It's easier if you write it out.)

You always want to start out w/ what you're given and continue your unit conversions from there. Since you started out with grams of Argon, you want grams of Argon on the bottom to cancel it out. Once you found the unit conversion: 1 mol/39.948 g Ar (molar mass of Ar), now it's time to convert to atoms. Since 1 mol is up on top, put 1 mol on the bottom. Considering you're looking for atoms, use Avagradro's number: 6.022*10^23.

Once simplified, you should get 1.51 x 10^23 atoms of Ar.

***I hope this helps! I also suggest using a mole map, if you're interested.***

Answer:

Usually, the cells are round, elongated or spherical. There are also some cells which are long and pointed on both the ends. Such cells exhibit spindle shape. In some cases, the cells are very long.

Explanation:

Hope I helped! Brainliest plz!

Answer:

The answer is a trench

Answer:

A solution of potassium chloride when mixed with silver nitrate solution forms an insoluble white substance silver chloride.

Explanation:

:)

Answer:

80 g

Explanation:

Alloy = nichrome

100 g of nichrome contains 20 g of chromium

Contains only two elements (Nickel and Chromium) hence;

Mass of Alloy = Mass of Nickel + Mass of Chromium

100 = Nickel + 20g

Nickel = 100 g - 20 g = 80 g

Answer:

A.

Explanation:

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Answer:

B. It is highly flammable.

Explanation:

Chemical properties deal with how the substance will behave when brought into contact with other substances, and usually have to do with it undergoing some kind of reaction. Flammability is a chemical property.

Density, melting point, and color are all considered physical properties.

Answer:

d

Explanation:

ignition is a chemical. reaction

Answer:

Wanning gibouss 56%

Explanation:

Answer:

60 Liters

Explanation:

The equation for this reaction is given as;

N2 + 3H2 → 2NH3  

From the reaction;

3 mol of H2 produces 2 mol of NH3

At STP;

1 mol = 22.4 L

This means

67.2 L ( 3 * 22.4) of H2 produces 44.8 L ( 2 * 22.4) of NH3

How many L of H2 would produce 40 L of NH3

67.2 = 44.8

x = 40

Solving for x;

x = 40 * 67.2 / 44.8

x = 60 L

Ammonia gas is a compound that is made up of two elements, nitrogen and hydrogen. So, option C is right.

A compound is a substance that is made up of two or more elements chemically combined. Ammonia gas is made up of the elements nitrogen and hydrogen, which are chemically combined in the ratio of 1:3.

Elements are the basic building blocks of matter. They cannot be broken down into simpler substances by chemical means. Atoms are the smallest unit of an element that can exist.

Mixtures are substances that are made up of two or more elements or compounds that are not chemically combined. The components of a mixture can be separated by physical means, such as filtration or distillation.

An atom is the smallest unit of an element that can exist and ammonia gas is not an atom because it is not the smallest unit of an element.

Therefore, option C, compound is correct.

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The term mole concept is used here to determine the moles of ammonia. The number of moles of ammonia which can be make from 6.20 moles of N₂ is 12.4.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

You need one nitrogen atom to produce ammonia. Here we can see that there are two nitrogen atoms in N₂.

One mole of any substance contains Avogadro number of molecules. A mole is defined as the mass of the substance which consists of the equal quantity of basic units.

The number of moles of ammonia from 6.20 moles of N₂ is:

6.20 × 2 = 12.4

Thus the number of moles is 12.4.

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Answer: NO

Explanation:

As per the given balanced equation, 2 moles of NO reacts with 2 moles of CO. Hence, 3 g or 1.07 moles of CO needs to react with the same number of moles of NO. But we have only 3 g or 0.1 mole of NO. Hence, NO is the limiting reactant.

A limiting reactant in a reaction is the reactant which is fewer in amount or consume early without complete reaction with other reactants. Hence, as soon as this reactant is consume, the reaction stops.

Given 2 moles of NO reacts with 2 moles of CO.

molar mass of NO =  30 g/mol

molar mass of CO = 28 g/mol.

Number of moles in  3 g of CO = 3/28 = 1.07 moles

number of moles in 3 g of NO = 3/30 = 0.1 moles.

1.07 moles of CO needs 1.07 moles of NO. But only 0.1 moles are present.

Therefore, NO is the limiting reactant in this reaction.

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Answer:

A lightning

Explanation: