Please help me thank you! Stay safe

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 2 g/ml

volume = final volume of water - initial volume of water

volume = 508 - 500 = 8 mL

We have

mass = 2 × 8

We have the final answer as

Hope this helps you

Answer:

See explanation

Explanation:

This question is obviously supposed to be a multiple choice question but the options are missing.

However, the question intends to test the student's knowledge about combustion of fossil fuels. Fossil fuels are mostly composed of hydrocarbons of different chain lengths.

The longer the chain length, the greater the energy released when the compound is burnt since there are more energy stored in its bonds.

Hence, the correct answer to this question will be the option that contains the greatest number of C-C and C-H bonds.

Answer:

In thermolysis, water molecules split into their atomic components hydrogen and oxygen. For example, at 2200 °C about three percent of all H2O are dissociated into various combinations of hydrogen and oxygen atoms, mostly H, H2, O, O2, and OH.

Explanation:

Answer:

Can we find a safe cure for cancer?

Explanation:

pls mark brainliest

Answer:

2

3

Explanation:

To infer the last energy of the given atoms, we need to write their electronic configuration:

For N = 1S² 2S² 2P³

     Mg  = 1S² 2S² 2P⁶ 3S²  

The energy levels are usually designated as;

   n = 1

   n = 2

   n = 3

   n =4

For N, the last energy level is 2

     Mg, the last energy level is 3

We can also determine this number by the periods the atoms can be found.

Answer:

Answer Option A) To attain a noble-gas electron configuration.

Explanation:

Correct answer from test

Taking into account the definition of covalent bond and octet rule, the correct answer is option A.  Atoms share electrons in covalent bonds to achieve a noble gas electron configuration.

The covalent bond is the chemical bond that occurs between atoms of non-metallic elements. These atoms have many electrons at their outermost level and have a tendency to share them to acquire the stability of the noble gas electronic structure. In this way a molecule is formed.

The tendency of the elements to reach a stable configuration is known as the octet rule. For this, the octet rule explains that there must be eight electrons in their last energy levels, thus acquiring the structure of a noble gas.

So, a covalent bond is a force that joins two atoms of non-metallic elements to form a molecule in order to comply with the octet rule.

Finally, the correct answer is option A.  Atoms share electrons in covalent bonds to achieve a noble gas electron configuration.

Learn more:

Explanation:

Potassium is a chemical element with the symbol K and atomic number 19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmospheric oxygen to form flaky white potassium peroxide in only seconds of exposure

Answer:

Explanation:

Answer:

the third one, measured or observed without changing the identity and composition of matter. because physical property does not under go any change but can be put back.

Answer:

B

Explanation:

In this question, there is no mention of pressure, so we can eliminate answer D. In both cups, it mentions they contain 250 mL of water and both are stirred, so these would be constants. The only difference between the cups is temperature, so temperature must affect the rate that instant tea dissolves in water. Therefore the answer is B.

What is the DNA strand? You have not named it.

Answer:

Explanation:

This should be in physics.

d = 100 meters south

t = 13 seconds

v = d/t

v = 100 / 13

v = 7.69 m/s going south.

The point is that you have to specify the direction.

Answer:

3.065 x 10^-24

Explanation:

hope this helps

Answer:

im pretty sure its move at a constant rate to the right

Answer:

Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.

Explanation:

google

Answer:

explanations below

Explanation:

The alkaline earth metals are the 6 chemical elements that can be found in group two of the periodic table. These elements have a lot of properties in common, in the sense that they are generally shiny, reactive at standard temperature and pressure and they are also silvery-white. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra)

These metals have two electrons at their orbits, which can be easily lost to form cations (with charge +2, and an oxidation state of +2)  

Below are some of their details

Name: Beryllium  

Number of Protons/Electrons: 4  

Number of Neutrons: 5  

Name: Magnesium  

Number of Protons/Electrons: 12  

Number of Neutrons: 12  

Name: Calcium  

Number of Protons/Electrons: 20  

Number of Neutrons: 20  

Name: Strontium  

Number of Protons/Electrons: 38  

Number of Neutrons: 50  

Name: Barium  

Number of Protons/Electrons: 56  

Number of Neutrons: 81  

Name: Radium  

Number of Protons/Electrons: 88  

Number of Neutrons: 138  

Answer:

46.943 million km

Explanation:

From an average distance of 36 million miles (58 million kilometers), Mercury is 0.4 astronomical units away from the Sun.

From an average distance of 36 million miles (58 million kilometres), Mercury is 0.4 astronomical units away from the Sun.

(I hope this helped ^^)

Answer:

Feed Consistency.

Explanation:

Feeding that is supposed to yield the volume of a gnome for our chickens to lay eggs.

The Boxes of Clean Nests.

The Areas Free.

With calcium.

Regularly check it.

Protection Coop.

About fresh water.

Controlling Parasites.

Answer:

A. testosterone

Explanation:

i took the unit test

Answer:

20

Explanation:

Answer:

International understanding or internationalism is a feeling that the individual is a not only a member of his country, but a member of the world as well.  To ensure world peace.  To prevent world wars.  To promote human welfare. To promote mutual understanding and interdependence.

Answer:

True

Explanation:

Answer:

c

Explanation:

Answer:

A. a best guess explanation

Explanation:

A scientific theory explains why something behaves the way it does and is usually backed up by different sources. They are not speculations and can be proven. Those which are speculations and are not proven are called hypothesis. A scientific theory can also be replaced, if it is found that it does not produce valid results, or if a better theory is proposed which is made of one or more old theories.

Answer:

gas

Explanation:

i think it might be gas

Answer:

i think that the children will inherit the brown eyes, it is the best answer since the other things cant be inherited and he dyed his hair blonde

Explanation:

Answer:

d = 2.8 g/mL

Explanation:

Given data:

Mass of sample = 67.9 g

Volume of water = 28.0 mL

Volume of water + sample = 52.0 mL

Density of sample = ?

Solution;

Density is equal to the mass of substance over volume of substance.

Formula:

d = m/v

d = density

m = mass

v= volume

Now we will calculate the volume of sample.

Volume of sample = (volume of water+ sample) - volume of water

Volume of sample = 52.0 mL - 28.0 mL

Volume of sample = 24.0 mL

Now we will calculate the density.

d =67.9 g /24.0 mL

d = 2.8 g/mL

Answer:

Thank you ☺️

Answer:

They require diffrent types of atoms for their makeup I belive is the answer Hope this helps

Explanation: Wow you have a lot a questions XD :D :3

Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties.

i hope this helps

Answer:

Because the reaction releases CO2 gas

Explanation:

therefore creating an effervecence within the solution as the carbonate dissociates