Assume that an object has been placed in the pan of a triple beam balance. The
scales of the balance are shown below. What is the mass of the object?

Answer:

B. Products

Explanation:

trust me its right

Given parameters:

Mass of H₃PO₄  = 49g

Unknown:

Number of moles  = ?

Solution:

To find the number of moles of a given specie;

   number of moles = [tex]\frac{mass}{molar mass}[/tex]

Molar mass = 3(1) + 31 + 4(16) = 98g/mol

Input the parameters and solve;

       Number of moles  = [tex]\frac{49}{98}[/tex]  = 0.5mole

The number of moles is 0.5mole

Answer:

A. cutting a substance into four pieces

Explanation:

The others include burning, reacting, and rust which make up a chemical change.

Cutting a substance into four pieces indicates a physical change. The correct option is A.

Even before to and after a physical change, the material implicated is unique architectural the same.

Physical changes include texture, shape, heat, and the beginning of a change in the state of matter. The texture of a substance influences how it feels.

A physical change is simply a change in appearance. The situation has not changed since the change.

Physical change can be seen in the use of cutting paper, melting butter, dissolving salt in water, and breaking glass.

Chemical reaction takes place when bonds among molecules or atoms are broken or formed.

This implies that one material with a specific set of properties is transformed into another substance with a different set of properties.

Thus, the correct option is A.

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Answer:

12 ml

Explanation:

the answer will be calculated by subtracting 37 ml from 25 ml so ,

37 - 25

= 12 ml

Answer:

Hey mate.....

Explanation:

This is ur answer.....

---> Equal

hope it helps,

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Follow me......

Answer:

I am not quite sure if this is what you are looking for but each side of the equation should be equivalent.

Answer:

the number of protons

Explanation:

that's it

Answer:

Physical.

Explanation:

Nothing changes in a chemical state just adding hot air to a balloon.

I'm pretty sure this is classified as a chemical change.

Answer:

electrons/electron density

Explanation:

The branch of science that deals with electrons are called chemistry. An element consists of electrons, protons, and neutrons.

The correct answer to the question is electrons density.

In the cloud model,  the electrons are revolving around the nucleus. In an atom when the electron's density is very high which represents a cloud.

Hence, the correct answer is electrons.

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Answer:

B

Explanation:

The compound corresponds to a molecule AX4E where A is the Central atom, X are the other atoms present and E is the lone pair of electrons.

The shape of this molecule is based on a trigonal bipyramid since the molecule contains five electron domains.

Since there are four bond pairs and one lone pair, the molecular geometry is see-saw with equatorial bond angle <120° and axial bond angle <90°.

For AX4E (five electron pairs), the lone pair should occupy an equatorial position instead of an axial position since the equatorial position has two neighboring electron pairs that are positioned at about 90° apart from each other and two other neighboring electron pairs that are positioned at 120° from each other. The axial position has 3 neighboring electron pairs positioned at 90° from each other and another neighboring electron pair positioned at 120°. Hence the equatorial position experiences lesser repulsion compared to the axial position.

Hence in the structure pictured in the question, position B is a preferred position for the lone pair instead of position A.

Answer:

density = 7.83g/mL

It will sink in water.

Explanation:

D = mass/volume

94/12 = 7.83 g/mL

density of water is 1g/mL

Object is more dense than water, meaning it will sink.

Answer:

A) compund

Explanation:

(a)- Time

(b)- Heat produced(i guess)

(c)- Material

this is what I think, hope it helps

Answer:

The correct option is;

b. It contains at least two colored substances

Explanation:

In chromatography, a mixture is separated into its components, such that in the filter paper, on which the drops of ethanol are then placed on the ink mark, we have different phases of the components of the mixture that have different levels of mobility by capillary action through the filter paper.   Therefore, given that two concentric rings of circles are obtained, we have that each ring is composed of a different component of the mixture and there are therefore, at least two colored substances.

Answer:

Nitrogen

Explanation:

:) pls mark brainliest

Answer:

Nitrogen

Explanation:

To find your answer, pay attention to the number of protons. Protons define an element's atomic number.

Explanation:

a cl chlorine

b NH3 ammonia

c co2 carbon dioxide

d H hydrogen

e o oxygen

Answer:

In case of low-mass stars,the outer layers of the low mass stars are expelled  as the core collapses such that the outer layers form a planetary nebula.

Explanation:

In case of low-mass stars,the outer layers of the low mass stars are expelled  as the core collapses such that the outer layers form a planetary nebula. The core remains as a white dwarf and finally become a black dwarf as it cools down. A low mass star consumes its core hydrogen and turns it into helium over its lifetime.

1 mole contains 6.023 *10^23 molecules

Answer:

b

Explanation:

plz mark brailest

Answer:

I would guess that a polar air mask would be freezing, high winds type weather. I think that's right.

Answer:

Cool and dry

Explanation:

Exactly what it is on Edge

I know I am late to answer but for the points and for the people that need it

Answer:

Explanation:

B . Is the correct answer

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 136 g

volume = 12 cm³

We have

[tex]density = \frac{136}{12} = \frac{34}{3} \\ = 11.333333...[/tex]

We have the final answer as

Hope this helps you

Answer:

1

Explanation:

there is only one sulphur (S) atoms in the formula for sodium sulphate

The chemical formula for sodium sulfate is Na₂SO₄.One sulfur atoms are in the formula for sodium sulfate.

The term chemical formula shows the elements that create  the compound and the numbers of atoms of each element in the smallest unit of that compound, be it a molecule or a formula unit.

Chemical formulas are classified into three types: empirical, molecular, and structural.

Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.

Thus, the chemical formula for sodium sulfate is Na₂SO₄. In sodium sulphate two molecules of sodium, one atom of sulfur, and four atoms of oxygen are present.

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Answer:

173.2 C

Explanation:

have a good day

21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.

The standard enthalpy of fusion of NaCl is 0.52 kJ/g, that is, it takes 0.52 kJ of heat to melt 1 g of NaCl at its melting point. The heat required to melt 40 g of NaCl is:

[tex]40 g \times \frac{0.52kJ}{g} = 21 kJ[/tex]

21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.

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Answer:

B)

Explanation:

Answer:

noble gases are very high because they have the maxium amount of electrons in their outer shell

Explanation:

Answer:

balance

Explanation:

because you just add together but they just switch the 2 and 3