Please help!

Fill in the blank

Answer:

12 ml

Explanation:

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

37 - 25

= 12 ml

The metric system is used to measure the objects based on various parameters. A centimeter is a unit of length. One inch is equivalent to 2.54 cms.

The Metric system is the system used to estimate the weight (mass), length, and capacity of the object and was first introduced in France by  Gabriel Mouton, a mathematician, and an astronomer. The metric system measures length, mass, volume, time, etc.

The metric system of length use the SI unit of meter, other units used to measure the length are centimeter, kilometer, millimeter, inches, yard, mile, feet, etc.

Given,

Length = 1 inch

It is known that an inch is equivalent to 2.54 centimeters, hence, 1 cm = 2.54 cms.

Therefore, there are 2.54 centimeters in one inch of the object.

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Answer:

B. Products

Explanation:

trust me its right

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:

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:

More than one

Explanation:

Answer:

More than one

Explanation:

Quizlet says so

the two middle ones is the answer

Explanation:

a cl chlorine

b NH3 ammonia

c co2 carbon dioxide

d H hydrogen

e o oxygen

Answer:

the number of protons

Explanation:

that's it

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:

A) compund

Explanation:

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:

Explanation:

B . Is the correct answer

Answer:

102 degrees, the intervals go by 2

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:

B)

Explanation:

Answer: Earth's average albedo is about 0.3. In other words, about 30 percent of incoming solar radiation is reflected back into space and 70 percent is absorbed. A sensor aboard NASA's Terra satellite is now collecting detailed measurements of how much sunlight the earth's surface reflects back up into the atmosphere.

Explanation: ik im annoying thanks

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

1 mole contains 6.023 *10^23 molecules

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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(a)- Time

(b)- Heat produced(i guess)

(c)- Material

this is what I think, hope it helps

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