Dalton’s theory states that atoms are the smallest possible parts of elements. In a chemical reaction, atoms will rearrange and form new substances with new properties. change form into completely new atoms with new properties. be destroyed and remade into new substances. be turned completely into energy.

Answer:

b

Explanation:

The products are formed when a hydrocarbon combusts are carbon dioxide and water and the correct option is option B.

Combustion is a chemical reaction that occurs when a fuel combines with an oxidizing agent, typically oxygen, resulting in the release of heat and the formation of products. It is an exothermic reaction, meaning it releases energy in the form of heat and light.

During combustion, the fuel undergoes rapid oxidation, breaking its chemical bonds and forming new bonds with oxygen. Common examples of combustion include burning of wood, gasoline, natural gas, and other hydrocarbon fuels.

The reaction is often accompanied by the production of flames and the release of carbon dioxide and water vapor.

Thus, the ideal selection is option B.

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Answer:

7

Explanation:

Answer:

7

Explanation:

The significant figures are: 1,0,0,0,0,2,1

Remember the rules is

1. Non-digits are always significant.

2. Any zeros between two significant digits are significant.

3. A final zero or trailing zeros in the decimal portion only are significant

Those are three rules you have to follow in order to see how many significant figures there are in 10,000,210.

So I’m guessing 7 is the answer

Therefore the answer is 7.

Hope this helps! :)

Brainliest would be highly appreciated! Thanks! :)

Answer: Darmstadtium

Hope that helped

Answer:

Ununnilium

Explanation:

Uun on the table of elements is Ununnilium.

Answer:

Volume of [tex]CHCl_3[/tex]   = 15.31 mL

Volume of [tex]CHBr_3[/tex] = 4.69 mL

Explanation:

Given that:

the density of the mixture = 1.82 g/mL

From the density of the pure samples

The density of [tex]CHCl_3[/tex] = 1.492 g/mL

The density of [tex]CHBr_3[/tex] = 2.890 g/mL

The total volume of the liquid mixture = 20.0 mL

Suppose the volume of  [tex]CHCl_3[/tex] = P ml

and the volume of [tex]CHBr_3[/tex] = Q ml

the sum of their volumes should be equal to the total volume of the mixture

[tex]P \ ml + Q \ ml = 20 ml[/tex]  ----- (1)

However, we know that Density = mass/volume

∴ mass = density × volume

The equation can now be expressed as:

[tex]\mathtt{(Density \ of \ CHCl_3 \times Vol. \ of \ CHCl_3 ) + (Density \ of \ CHBr_3 \times \ volume \ of \ CHBr_3)} = \mathtt{ (Density \ of \ mixture \times volume \ of \ the \ mixture)}[/tex]

1.492 g/mL × P mL + 2.890 g/mL × Q mL = 1.82 g/mL × 20 mL  ---- (2)

From equation (1) ;

let Q = 20 - P

The replace the value of P into equation (2)

1.492 g/mL × P mL + 2.890g/mL × (20 - P) mL = 1.82 g/mL × 20 mL

1.492 P g + 57.8g - 2.890 P g =  36.4g

1.492 P g - 2.890 P g = 36.4g - 57.8g

-1.398 P g = -21.4g

P = -21.4g/-1.398g

P = 15.31 mL

Q = 20 - P

Q = (20 - 15.31) mL

Q = 4.69 mL

∴

Volume of [tex]CHCl_3[/tex]   = 15.31 mL

Volume of [tex]CHBr_3[/tex] = 4.69 mL

Answer:

The Celsius scale is in general use wherever metric units have become accepted, and it is used in scientific work everywhere. Kelvin temperature scale is the base unit of thermodynamic temperature measurement in the International System (SI) of measurement

Answer:

C and D

Explanation:

In the first table, both element particles have more electrons than protons which is unusual and indicates they have a negative charge. Furthermore both numbers add up to full electron shells (2,8 and 2,8,8) meaning they are ions (charged particles formed to gain full valence shells and become stable), so it is C for the first question, negative ions.

As for the second one, isotopes like versions of the same element except with different numbers of neutrons, so they are still the same element but have different mass. As shown here the numbers indicate the number of neutrons therefore it is D, 3 more neutrons and no more electrons.

Hope this helped!

Answer:

The problems solved by the metric system includes, the eradication of fraud prevalent by the use of the approximately 800 units that were defined in 250 thousand ways due to the difference of the associated quantity to the units in different towns

The development of the metric system also solved the issues scientist had with working with the medieval system which were mainly national and regional systems that hindered scientific communication across regions

Explanation:

The volume of the ball is the same as the volume of fluid that it displaces.

Even though the question is incomplete but i will try to help you the much i can. We have to recall that the volume occupied by the tennis ball is equal to the volume of the water displaced and this offers a convenient way of measuring the volume of solids.

The volume of the tennis ball is obtained by accurately measuring he volume of the water before putting in the tennis ball. The volume of the ball is the same as the volume of fluid that it displaces which is Vb = Vf-Vi

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Answer:

40cm^3
Explanation:
I did this assignment and this was the answer so

Answer:

the molecules and atoms vibrate faster.

Explanation:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determine the state of matter of the substance. The result of increased molecular motion is that the object expands and takes up more space.

➡ this answer is based on my research. I hope it can help you

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Answer:

calcium=20

gold=79

copper=29

iron=26

Explanation:

Answer:

B

Explanation:

If the student needs one gram but so far only has 0.37 grams, then the amount they need is the difference between what they need and how much they already have. 1-0.37=0.63 grams.

...which isn't actually an option because none of them have decimal points but I would say it is B anyway because it is the equivalent ratio and maybe there was a typo.

Hope this helped!

Answer:

The answer is B :)

Explanation:

Answer:

The correct answer is 0.92 g

Explanation:

The density is defined as the mass per unit of volume:

Density= mass/volume

From the data provided:

volume= 5.4 L

density= 0.17 g/L

Thus, to calculate the mass of helium:

mass= density x volume = 0.17 g/L x 5.4 L= 0.918 g ≅ 0.92 g

Answer:

0.42g/cm³ or 420kg/m³

Explanation:

1cm³ = 1ml

10 × 1cm³ = 10cm³

Density = Mass ÷ Volume

4.2g ÷ 10cm = 0.42 g/cm³

Density = 0.42g/cm³ or 420kg/m³

Answer:

1 Joule=0.2390057361 Calorie

789kj=789×0.2390057361×1000

=188575.5257829calorie

Explanation:

Hope u have understand

Answer:

0.7 g/cm³

Explanation:

hey there,

< The formula for density is [tex]p = \frac{m}{v}[/tex]  where m = mass, v = volume, and p = density. An easy way to remember the formula is density equals love. I found this easy to remember because p = ♡ and when you think about it, if you split the heart in half through the middle like a fraction, it will make [tex]\frac{m}{v}[/tex] (if you don't understand what I'm saying, try writing it out and you will be able to see what I'm talking about!)

We already know that the block is 253 g so the mass is 253 g.

To find the volume, always multiply the 3 values width, length, and height whenever you are trying to find the volume of a block.

15.24 cm x 6.64 cm x 3.56 cm = 360.25 cm³

Now plug it into the formula.[tex]p = \frac{m}{v}=\frac{253}{360.25} = 0.7 g/cm[/tex]³ >

Hope this helped! Feel free to ask anything else.

Density of a substance is its mass divided by volume. Volume of the cube is calculated to 360.24 cm³ and thus the density of the cube is 0.7023 g/cm³.

Density of a substance is the measure of its mass per volume. Thus mathematically it is the ratio of mass to the volume of th substance. Density of a substance depends on the bond type, mass, volume, temperature and pressure.

The ratio of density of a substance to the density of water is called specific gravity. If the specific gravity is greater than one the body will sink in water and if it is less than one it will float on water.

The mass of the block is given 253 g and the volume can be calculated from the product of length,breadth and height.

Volume = 15.24 cm × 6.64  cm × 3.56 cm

             = 360.24 cm³.

Density = mass/volume

             = 253 g/ 360.24 cm³

             = 0.7023 g/cm³

Hence, the density of the block is 0.7023 g/cm³.

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Answer:

Electrode potential is the electromotive force to the galvanic cell built standard.

Explanation:

Electrode potential is the convention electrode is the standard hydrogen electrode to the value zero potential.

Answer:

In electrochemistry, electrode potential is the electromotive force of a galvanic cell built from a standard reference electrode and another electrode to be characterized.

Answer:

It takes 62863 dimes to equal the height of the Statue of Liberty.

Explanation:

If the Statue of Liberty is 305 ft tall and a coin is 1.35mm thick, how many coins will it take to equal the height of the statue?

Convert 305 ft to mm:

1 ft = 30.48 cm

305 ft = 9296.4 cm

92 964 mm

Now, if a dime is 1.35 mm thick, how many dimes will it take to get to 92 964 mm?

1 dime = 1.35mm

X dimes = 92964 mm

X coins = 92964 / 1.35

X = 62863 dimes

Answer:

one of the atoms sharing electrons is more electronegative than the other atom

Explanation:

A covalent bond is likely to be polar when one of the atoms sharing electrons is more electronegative than the other atom. Therefore, option (A) is correct.

A covalent bond can be described as a chemical link formed by the exchange of electron sets between particles. A covalent bond can be formed by equal sharing of electrons from both contributing atoms.

The pair of electrons in this type of bonding is known as shared pair or bonding pair. Covalent bonds are the sharing of bonding pairs that will ensure that the atoms gain stability in their outer shell.

Elements with very high ionization energies are incapable of transferring electrons and elements having low electron affinity cannot accept electrons. Covalent bonding takes place between two non-metallic atoms characterized by the equal sharing of electron pairs between the atoms and other covalent bonds with an electronegativity difference is more than 2.0.

Therefore, the covalent bond can be polar if one atom is more electronegative than the other atom.

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scientific notation is a mathematical way to turn large of small numbers into a simpler form.

ex. 9000000000 is  9*10^9     in scientific notation

ex. 0.000000009 is   9*10^-9 in scientific notation

Answer:

C, because matter can not be created or destroyed.

Explanation:

Hey there!

I believe your answer woukd be "The amount of matter stays same as water changes state."

Hope this helps!

Have a great day!

Answer:

19.3 g/mL

Explanation:

The following data were obtained from the question:

Mass (m) = 12.4 kg

Volume (V) = 642 mL.

Density (D) =.?

Next, we shall convert 12.4 kg to grams. This can be obtained as follow:

1 kg = 1000 g

Therefore,

12.4 kg = 12.4 × 1000

12.4 kg = 12400 g

Therefore, 12.4 kg is equivalent to 12400 g.

Finally, we shall determine the density of the gold as follow:

Density is simply defined as the mass of the substance per unit volume of the substance. It can be represented mathematically as:

Density (D) = mass (m) / volume (V)

D = m/V

With the above formula, the density of gold can easily be obtained as follow:

Mass (m) = 12400 g

Volume (V) = 642 mL.

Density (D) =.?

D = m/V

D = 12400/642

D = 19.3 g/mL

Therefore, the density of hold is 19.3 g/mL

Answer:

v=50km/hr

Explanation:

Given:

s= 300km

t= 6 hours

Required:

v=?

Formula:

v=s/t

Solution:

v=s/t

v=300km/6h

v=50km/hr

Hope this helps ;) ❤❤❤

Answer:

It was called The Step Reconer

stepped reckoner was invented by digital mechanical calculator

Answer:

B

Explanation:

Hellium is a gas...

Solids are particles that are packed together

liquids are particles that are together but conforme to their container

gas have space between them and conform to their holder

Answer:

1. D

2. B

Explanation:

1. Isotopes vary in neutrons. Due to this variance, the difference in neutrons change the mass of the element.

Note: the amount of protons in an element never changes. The number of protons (the atomic number on the periodic table) identifies the element in question. If you add or subtract protons, you change the element.

2. B-10 and B-11 are two isotopes of the element Boron: One with 10 neutrons, and another with 11 neutrons. Because they contain a variance of neutrons, they do not have the same mass. This cancels choices A and D.

The protons of an element are equal to the atomic number of that element. Borons atomic number is 5 (according to the periodic table), so it contains 5 protons. This cancels choice C as the element with 6 protons is Carbon.

Note: The amount of protons in an atom is balanced out by the same amount of electrons to allow for a neutral charge of the element (i.e., the protons, which contain a positive charge, and electrons, which contain a negative charge, cancel each other out. In the case of Boron: +5 protons - 5 electrons = 0 charge). This is why choice B is correct, as the consideration of an ion is not necessary for this question.

Answer:

Option B.

Explanation:

Isotopy is a phenomenon where by two or more atoms have the same atomic number (proton) but different mass number due to the difference in neutron present in the atoms. The atoms that exhibit Isotopy are isotopes.

With the above information, we can obtain the right answer to the question given above as follow:

For option A:

Isotope >> atomic no >> Mass no

16 8X >>> 8 >>>>>>>>> 16

16 6X >>> 6 >>>>>>>>> 16

Since they have the different atomic number, they are not isotope.

For option B:

Isotope >> atomic no >> Mass no

16 8X >>> 8 >>>>>>>>> 16

17 8X >>> 8 >>>>>>>>> 17

Since they have the same atomic number but different mass number, they are isotope.

For option C:

Isotope >> atomic no >> Mass no

12 6X >>> 6 >>>>>>>>> 12

14 7X >>> 7 >>>>>>>>> 14

Since they have different atomic number, they are not isotope.

For option D:

Isotope >> atomic no >> Mass no

6 26X >> 26 >>>>>>>>> 6

26 6X >>> 6 >>>>>>>>> 26

Since they have different atomic number, they are not isotope.

From the above illustration, only option B contains isotopes because the atoms have the same atomic number but different mass number