A cell is a system
True
False

Answer:

Explanation:

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

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

From the question

mass = 70 g

volume = 10 mL

We have

[tex]density = \frac{70}{10} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

A

Explanation:

An atom that is a different isotope of a given element would contain 6 protons, 7 neutrons, and 6 electrons. Therefore, option (A) is correct.

Isotopes are atoms of an element that contain the same atomic number as the original element but a different atomic mass. Isotopes of an element possess the same number of electrons and the number of protons but different numbers of neutrons in their respective nucleus.

For example, the isotopes of carbon are carbon-14, carbon-13, and carbon-12. Carbon-14 has a total of 8 neutrons, carbon-13 have a total of 7 neutrons, and carbon-12 has a total of 6 neutrons. So all the isotopes of carbon have different numbers of neutrons.

Given element has 6 protons, 6 neutrons, and 6 electrons. So the isotope of this element will have  6 protons, and 6 electrons but not 6 neutrons. Therefore, the element with 6 protons, 7 neutrons, and 6 electrons is the isotope of the given element.

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Answer: Yes

Explanation:

Scientific theory can be defined as the solutions to the problems of the queries related to natural phenomena or it is the explanation for different aspects of the natural world. It is done with repeated testing procedure. To prove the facts of the theory, repeated experimental tests, and observations are done. The theories are tested under the controlled conditions of the experimental set up.

On the basis of the above description, we can say that the scientific investigations are done in the form of experimentation trials before proposing  a theory. The theory is tested and is not simply expected.

Answer: Yes, Clements compared ecological succession with the development of organisms. Yes, this theory was tested.

Explanation:

Answer:

Hmmmm,   Z=10   the element is not fluorine, and its not sodium.

Explanation:

If you are doing your chemistry homework, you must have a Periodic Table beside you. You will also be supplied a Periodic Table in every test in Chemistry and Physics you will ever sit. So get your Periodic table, and consider the following. It has 10 electrons, 10 fundamental negative charges. Since the element is neutral, it has 10 fundamental positive charges, 10 protons, in its nucleus. In the nucleus there are also 12 massive, neutral particles, 12 neutrons. The number of protons,  Z, defines the atomic number, and the Periodic Table is arranged according to  Z.

.

Answer:

1. Measuring the weight of an apple- scale.

2. Studying a distant object- telescope.

3. Studying a very small object- microscope.

4. Measuring the length of a book- ruler.

5. Measuring the temperature of a cup of tea- thermometer.

Explanation:

1. A scale or measuring scale is used to measure or take the weight of any object. It can be either an analog or digital scale as long as the measurements can be taken from it. So, measuring the weight of an apple can be done on a measuring scale.

2. A telescope is an instrument that is used in scientific, especially in space explorations, to study a distant object in the universe/ sky. It gives a clear image and enables a person to view things closer than they are. So, a telescope can be used to study distant objects.

3. A microscope is used to study very different small objects, such as microbes and other organisms. It enlarges the objects to be viewed and thus, enables them to be studied in detail.

4. A ruler may be used to measure the length of a book. It has indications or marks by which the lengths can be taken.

5. A thermometer is an instrument that is used to measure the temperature of anything, be it a person or even other things such as food and even a cup of tea.  

Answer:

Match each tool on the left with its most likely use on the right by choosing the correct number.

4

ruler

1

scale

2

telescope

5

thermometer

3

microscope

Explanation:

Answer:

Your lungs deliver oxygen and remove carbon dioxide from your blood in a process called gas exchange. Gas exchange happens in the capillaries surrounding the alveoli, where the oxygen that is breathed in enters the circulatory system and carbon dioxide in the blood is released to the lungs and then breathed out.

Answer:j

Explanation:im not stupid??

Answer:

2

Explanation:

student 2 is correct because the number of protons determines what element an atom is, and the number of valence electrons shows how the atom bonds and its reactivity.

Answer:

B. stored energy

hope this helps!!

Answer:

The molecular formula of a compound may be the empirical formula, or it may be a multiple of the empirical formula. For example, the molecular formula of butene, C4H8, shows that each freely existing molecule of butene contains four atoms of carbon and eight atoms of hydrogen. Its empirical formula is CH2.

Explanation:

Answer:

So if you divide the kg of butter and the cake that will be your answer and then you should have a fraction so the fraction would be 0.25 over 2 because you simplified it. 0.25/2

Explanation:

Answer: 2

Explanation:

Answer:

It is two

Explanation:

Answer:

The rubber becomes brittle and can break in your hand. The explanation for why this happens concerns cross-linking bonds. Ultra-violet light from the sun provides the polymer molecules with the activation energy they need to be able to form more cross-links with other chains.

Answer:

It poisons animals, it coats reefs, and damages ecosystems.

Explanation:

It is the same principle with humans. If we drink oil ( the actual stuff from for example, Spindletop) we would get poisoned, and die. If we eat toothpaste over and over, we have to go to poison control so they can pump your stomach. If we drink cyanide, we will die. If we get poison in our food, we will either starve, try to fix it, or we get poisoned and die. If we were some fish, we might not be able to fix the water, so we starve, or we get poisoned.

It is the same lines as the animals, our pollution and oil floods our environment and we start to die.

Sponsered by: STAF

Save the Animals Foundation

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I was kidding about the sponsership.

Answer:It is the same principle with humans. If we drink oil ( the actual stuff from for example, Spindletop) we would get poisoned, and die. If we eat toothpaste over and over, we have to go to poison control so they can pump your stomach. If we drink cyanide, we will die. If we get poison in our food, we will either starve, try to fix it, or we get poisoned and die. If we were some fish, we might not be able to fix the water, so we starve, or we get poisoned.It is the same lines as the animals, our pollution and oil floods our environment and we start to die.

Explanation:

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual density = 0.7988 g/mL

error = 0.7988 - 0.7925 = 0.0063

So we have

[tex]P(\%) = \frac{0.0063}{0.7988} \times 100 \\ = 0.788683024...[/tex]

We have the final answer as

Hope this helps you

Explanation:

marble is the correct answer

Answer:

Elephant

Explanation:

An elaphant is the option with the most mass.

Hope this helps! Please makr brainliest! Stay safe, God bless and happy studying!

Answer:

To understand this first we must understand what is happening at the molecular level. When we heat any substance it changes its state of matter because its molecules get excited. For example, when we heat water it turns into gas so the molecules get excited. The hot air balloon will move faster if we add heat because the gas molecules will get excited and push against the balloon, making it faster. If we start removing heat, the balloon's acceleration will slow down because the molecules will get less excited.

Hot air balloons flies by means of it being lighter than air

The flame can be used to move the pilot to different directions by increasing the temperature of the air in the balloon and therefore, the volume, therefore, decreasing the density of the air which changes the elevation of the balloon to the appropriate elevation having winds moving in the desired direction

The principle by which the above process works is as follows:

According to Charles law, the volume of a mass of gas is directly proportional to its Kelvin temperature

V ∝ T

[tex]\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}[/tex]

[tex]V_2 = T_2 \times \dfrac{V_1}{T_1}[/tex]

[tex]Density, \rho = \dfrac{Mass, \ m}{Volume, \ V}[/tex]

Therefore, as the temperature is increased, the volume occupied the mass gas increases, and therefore, the density decreases

The principle on which the hot air balloon operates on is the principle that hot air is less dense than and therefore, rises above cool air

Therefore, the pilot of an hot air balloon heats up the air in the balloon to allow the balloon to rise and the pilot switches off the burner so that the air in the balloon cools and the balloon looses altitude

The mechanism of the hot air balloon does not have a steering, and therefore, the wind direction is used to steer the balloon

The direction of the wind is different at different altitude, such that by obtaining the direction of the wind at a given altitude, the pilot can raise or lower the balloon up or down to the altitude having the desired wind direction, by increasing the temperature of the air in the balloon by switching on the burner to go to a higher altitude, or by switching off the burner so the air in the balloon cools and the balloon loses some of its altitude to reach the wind going in the direction of the pilot

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Answer:

C, number of protons and neutrons

Answer:

here is your answer

Explanation:

1. sodium sodium is very reactive metal

2. when it exposed in air it automatically form Na2O.

3. when when it put in water it reacts visoroustly and start burning on water.

( due to this it is called active element)

A few important ones........

Answer:

there is no following so there isnt a answer

Explanation:

Answer:

8.4 m/s

Explanation:

Initial velocity of the object is 0 as it was at rest.

We need to find the object’s average velocity during the 3 second to 5 second.

We can see from the graph that from 3 s to 5 s, the graph is a straight line. If we take the slope we can find the average velocity during the 3 second to 5 second.

Displacement between 3 s to 5 s is :

D = 24.8 m - 8 m = 16.8 m

Time = 5 s - 3 s = 2 s

Now,

Average velocity,

[tex]v=\dfrac{\Delta y}{\Delta x}\\\\y=\dfrac{16.8\ m}{2\ m}\\\\y=8.4\ m[/tex]

So, the object’s average velocity during the 3 second to 5 second is 8.4 m/s.

if an electron is passed from Ago B then Slides electrons which makes it electropositive i.e A+

According to the redox reactions , when an electron is transferred from A to B , B molecule has been reduced as it gains electrons.

Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.

While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.

The ion or molecule which accepts electrons is called as oxidizing agent while the ion or molecule which donates electrons is called as a reducing agent.

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Answer:

liquid, solid, gas

Explanation:

Solid, Liquid and gaseous

There are 5 states of matter

1.) Solid

2.) Liquid

3.) Gaseous

4.) Plasma

5.) Bose Einstein

the First three are main

Answer:

colloid

Explanation:

i think she making meth in her basement

Answer:

The answer is A. Construction. The production of raw materials for construction in factories is harmful for the environment due to CO2 emissions. The chemicals used in construction and the diesel used by construction vehicles are also harmful to the environment.

Explanation:

In an ecosystem , human activity which constitutes to air pollution is construction.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems.

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Answer:

D: All of the above

Explanation:

It's all of the above, they are all pretty similar to the accurate answer.

Answer:

D

Explanation:

Answer:

Explanation

In the Bohr model of the atom, electrons travel in defined circular orbits around the nucleus. The orbits are labeled by an integer, the quantum number n. Electrons can jump from one orbit to another by emitting or absorbing energy.