How do the scientist know that cells exist

Answers

Answer 1
Because of us and other cells from plants and Animals

Related Questions

calculate the amount in moles of so3 form when 0.36mol so2 react with excess o2

Answers

Answer:

0.36 moles

Explanation:

Given data:

Number of moles of SO₃ form = ?

Number of moles of SO₂ react = 0.36 mol

Solution:

Chemical equation:

2SO₂ + O₂      →      2SO₃

Now we will compare the moles of SO₃ with SO₂.

                       SO₂           :           SO₃

                         2             :            2

                       0.36         :           0.36

Thus, from 0.36 moles of SO₂ 0.36 moles of SO₃ formed.

If a substance begins with 64 atoms of radioisotope,how many will remain after two half-lives 

Answers

16 atoms will remain

when different atoms bond, the more electronegativity atom attracts electrons more strongly and acquires a slightly negative charge. true or false?

Answers

Answer:

Explanation:This unequal distribution of electrons is known as a polar covalent bond, characterized by a partial positive charge on one atom and a partial negative charge on the other. The atom that attracts the electrons more strongly acquires the partial negative charge and vice versa.

Why
are the physical properties of isotopes differ slightly from each other?

Answers

Answer:

Isotopes of an element have different physical properties.

Hope I can help you have a nice day.

What is the result of the process that occurs in the image?

Answers

Ionic Bonding (the transfer of valence electrons)

Answer:

Ok:

Explanation:

Sodium gives fluorine an electron. This is in part due to electronegativity differences because sodium likes to lose an electron and fluorine likes to gain. As a result, sodium and become positively charged and fluorine negatively charged. This will for electrostatic attraction and the sodium and fluorine will form a bond. This bond is called an ionic bond.

NEED ASAP!!!
A rarefaction is a part of a sound wave where the particles are further apart than normal.
True
False

Answers

The answer-true
Why- not 100% sure lol

2Al+3Cl2---> 2AlCl3 (i cant remember if this is balanced equation or not if not can you do that too? thank you i appreciate it.)
If I have 5.0 g Aluminum how much AlCl can I produce?

Step 1 convert grams Al to moles Al: (the dashes resemble a fraction)
5.0 g Al
----------- times -------------- =


Step 2: convert mol al to mol AlCl3
0.19 mol Al
---------------- times --------------- =
1

step 3: convert MOL AlCl3 to GRAMS AlCl3
0.19 mol AlCl3
--------------------- times ---------------- = 25.4 g AlCl3
1
THIS FIRST # PART PROBLEM IS STOICHEMITRY for chemistry if you know please help me out I have been struggling on this for a week now..thank you so much.




This next part is LIMITING REACTANTS:
If Al produces 25.4 g of AlCl3 and Cl2 gas produces 20.0 g AlCl3 what is my limiting reactant, Al or C2??

How do i determine my percent yeild if my actual yeild is 19.5g???

i put a link to the picture!!

Answers

Answer:

the equation is balanced bro

How is cosmic microwave background radiation evidence for the Big Bang?

Answers

Answer:

In explanation,

Explanation:

Tests of Big Bang: The CMB. The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background", or CMB.

Molecules are related to matter because

Answers

Because matter is made up of molecules, the behavior of matter is dictated by the behaviors of the molecules. If the molecules were different, matter would be different. how is chemistry connected to everyday life? Many of the changes you observe in the world around you are caused by chemical reactions.

Which term answers the question "how fast in what direction"
Question 3 options:

position

distance

velocity

speed

Answers

velocity the direction and speed
velocity :) .............

Which of the following statements are true about effusion of gases.
A. At the same temperature, lighter molecules move at a higher velocity than heavier ones.
B. Diffusion and effusion are similar because both involve the motion of gas molecules from
regions of higher concentration to lower concentration.
C. Effusion involves the movement of gas molecules through a small hole in a container.
D. According to Graham's Law, the relative rates of effusion of two gases is directly proportional
to the squares of their molar masses.

Answers

Which of the following statements are true about effusion of gases.
A. At the same temperature, lighter molecules move at a higher velocity than heavier ones.
B. Diffusion and effusion are similar because both involve the motion of gas molecules from
regions of higher concentration to lower concentration.
C. Effusion involves the movement of gas molecules through a small hole in a container.
D. According to Graham's Law, the relative rates of effusion of two gases is directly proportional
to the squares of their molar masses.

Effusion refers to the movement of a gas through a small hole. It is different from diffusion which involves the movement of a gas from a region of higher concentration to a region of lower concentration.

The effusion of a gas is described by Graham's law. According to Graham's law, the rate of effusion of a gas is inversely proportional to the square root of the molar mass of the gas.

The following are true regarding the effusion of a gas;

At the same temperature, lighter molecules move at a higher velocity than heavier ones.Effusion involves the movement of gas molecules through a small hole in a container.

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Which of the following is a compound?

A. Ne
B. N2
C. NaCl
D. O2

Answers

Answer:

C

Explanation:

Answer:

NaCl

Explanation:

Because it's sodium chloride

can you easily make 1-bromopentane as the only product from the reaction of 1 pentene with HBr and why

Answers

The answer is NO
Due to the fact that Br- is attached to carbon which contains lower number of H atom. Therefore, the statement is not true.

what is set in mathematics​

Answers

Answer:

i dont get your question Man

        (っ◔◡◔)っ ♥ Hey Honey Here! ♥♥answer♥

In mathematics, a set is a well-defined collection of distinct objects

♥plz give me brain list it would really help a lot♥

                       ♥  お力になれて、嬉しいです

Which of the following has the largest atomic radius?

Na
CI
C
Mg
Be

Answers

Answer:

Na

Explanation:

On the periodic table, the atomic radius of an atom typically decreases when going from left to right and increases when going from top to bottom.

What are two reasons that ICl has a low melting point?

Answers

Answer:

1. It is a covalent bond and all covalent bonds have low melting points

Explanation:


8. Which of the following elements reacts like calcium (Ca) but with less atomic
mass?
Potassium (K)
Magnesium (Mg)
Strontium (Sr)
Scandium (Sc)

Answers

Answer:

Magnesium (Mg)

Explanation:

An element with a lower atomic mass than Calcium that has similar chemical property is the element Magnesium (Mg).

This because, elements in the same group or family on the periodic table has similar chemical properties.

Magnesium belongs to the same group as Calcium, other elements are:

     Be  Mg  Ca    Sr  Ba  Ra

The group is made of the alkaline earth metals. They have two valence electrons in their outer shell.

help me pls
. About how often does the Moon complete an orbit around Earth? ?

Answers

Answer:

approximately 27 days

Explanation:

54.2 g N
determine the number of moles

Answers

Answer:

3.87 mol N

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic TableUsing Dimensional Analysis

Explanation:

Step 1: Define

54.2 g N

Step 2: Identify Conversions

Molar Mass of N - 14.01 g/mol

Step 3: Convert

[tex]54.2 \ g \ N(\frac{1 \ mol \ N}{14.01 \ g \ N} )[/tex] = 3.86867 mol N

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

3.86867 mol N ≈ 3.87 mol N

What type of bond occurs between tow nonmetals.

Answers

Answer:

covalent bonds............

covalent bonds

Ionic bonds structure when a nonmetal and a steel alternate electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic enchantment between two oppositely charged ions.

Calculate the mass (in g) of 2.1 x 1026 atoms of Os.

Answers

Answer:

66326.8 g Os

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

2.1 × 10²⁶ atoms Os

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Os - 190.2 g/mol

Step 3: Convert

[tex]2.1 \cdot 10^{26} \ atoms \ Os(\frac{1 \ mol \ Os}{6.022 \cdot 10^{23} \ atoms \ Os} )(\frac{190.2 \ g \ Os}{1 \ mol \ Os} )[/tex] = 66326.8 g Os

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

66326.8 g Os ≈ 66000 g Os

Doing Science plz help

Answers

Answer:

My guess is b or c but its robably wrong

Explanation:

I just also need points sorry <3

The answer is C
Because it’s balanced you know this because of law conversion of mass.

explain what two-dimensional (2-D) and three-dimensional (3-D) models
are. Give an example of one you've seen recently.

Answers

Answer:

2D refers to the term “two-dimensional.”

3D refers to the term “three-dimensional.”

Explanation:

Circle, triangle, square, rectangle, and pentagon are some of the most common examples of 2D shapes.

Cylinder, pyramid, cube, and prism are some of the most common examples of 3D shapes.

Can you divide II by another factor and still have it be correct? Why or why not?

Answers

Answer:

no, because factors can not be divided

Explanation:

Ca(OH)2 + 2HCl → CaCl2 + 2H2O Which of the following is true about the equation

Answers

Answer:

This equation is a double reaction

Explanation:

I hope this is the answer

Answer:

ca(OH)2 is the base and CaCI2 is the salt

Explanation:

A given sample of a gas has a volume of 3 liters at a
pressure of 4 atmospheres. If temperature remains
constant and the pressure is changed to 6
atmospheres, the P x V product will equal
A). 9 B) 12 C) 18 D) 24

Answers

Answer:

B) 12

Explanation:

Given parameters:

Initial volume  = 3L

Initial pressure  = 4atm

Final pressure  = 6atm

Unknown:

Final volume  = ?

Solution:

To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

   P₁V₁  = P₂V₂

 P and V are pressure and temperature values

 1 and 2 are initial and final states.

    PV product  = 3 x 4 = 12

The [tex]P \times V[/tex] product of this given sample of gas is equal to: B) 12 atm.

Given the following data:

Initial volume = 3 Liters Initial pressure = 4 atm. Final pressure = 6 atm.

To determine the [tex]P \times V[/tex] product of this given sample of gas, we would apply Boyle's law:

Boyle's law states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyle's law is given by the formula;

[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]

Where;

P is the volume of a gas.V is the pressure of a gas.

Substituting the given parameters into the formula, we have;

[tex]P \times V = 4 \times 3\\\\P \times V = 12\;atm[/tex]

Find more information: https://brainly.com/question/1437490

The energy released in cellular respiration helps an athlete perform. How do you think an athlete might be able to increase cellular respiration?

Answers

Answer:

by eating healthy food and having a balanced diet also by exercising

An athlete might be able to increase their cellular respiration through the consumption of a balanced diet along with a regular exercising pattern.

What is Cellular respiration?

Cellular respiration may be defined as a process through which organisms break down the molecules of glucose within the cell in order to avail energy in form of ATP for metabolic and cellular processes.

As we all know that glucose molecules and oxygen are the reactants for cellular respiration. So, a better level of glucose can be availed by a healthy and balanced diet and a standard oxygen level can be availed through a regular exercising pattern.

Therefore, an athlete might be able to increase their cellular respiration through the consumption of a balanced diet along with a regular exercising pattern.

To learn more about Cellular respiration, refer to the link:

https://brainly.com/question/2809259

#SPJ2

A measured sample of argon gas has a volume of 20.0 L at a pressure of 660 mm Hg. What is the final volume
if the pressure is decreased to 550 mmHg?
O A. 5.5 L
O B. 17 L
OC. 24 L
OD. 240 L

Answers

Answer:

C . 24 L

Explanation:

Given data:

Initial volume of gas = 20.0 L

Initial pressure of gas = 660 mmHg

Final volume = ?

Final pressure = 550 mmHg

Solution:

The given problem will be solved through the Boly's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

660 mmHg × 20.0 L = 550 mmHg × V₂

V₂ = 13200 mmHg. L/ 550 mmHg

V₂ = 24 L

What happens when the thermal energy of a substance increases?

Answers

Answer:

Both the motion of the particles in the substance and the temperature of the substance increase.

Answer The motion of the particles in the substance increases, and the temperature of the substance decreases.  

Explanation:

what state of matter has more volume?​

Answers

Answer:

please mark as brainliest

Explanation:

ans: Gas

The particles of matter in the gaseous state are neither close together nor fixed in place. The gas expands to fill its container. Thus, a given number of particles will have the greatest volume in the gas state.30‏/06‏/2014

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