A solid substance turns directly into a gas. Which term describes this change?

A)deposition
B)evaporation
C)melting
D)sublimation

Answer:

See explanation

Explanation:

1 mole of Ne occupies 22.4 L

x moles of Ne occupies 18.6 L

x = 1 mole *  18.6 L/22.4 L

x = 0.83 moles

1 mole contains 6.02 * 10^23 atoms

0.83 moles occupies  0.83 moles *  6.02 * 10^23 atoms/1 mole

= 4.9966 * 10^23 atoms = 5.0  * 10^23 atoms

the coefficient of the scientific notation answer =5.0

the exponent of the scientific notation answer = 23

significant figures are there in the answer = 5

the right most significant figure in the answer = 1

Answer:

The final temperature is  39.58 degree Celsius

Explanation:

As we know

Q = m * c * change in temperature

Specific heat of water (c) = 4.2 joules per gram per Celsius degree

Substituting the given values we get  -

5750 = 335 * 4.2 * (X - 35.5)

X = 39.58 degree Celsius

Answer:

312.731

Explanation:

it had a long answer but im sure ur teacher wanted u to round it

hope this helps!

~goldfishareswag/brianna

:)

Answer:

Using Charles law of Gas

Explanation:

Answer:

1.1grams

Explanation:

Find moles of water:

4.5x10^22/(6.02x10^23)=0.07mol

Find molar mass of the water

O=16.00g/mol

0.07x 16.00=1.1 grams

Question:

At standard temperature and pressure, the volume of a tire is 3.5L. What is the new pressure if the temperature outside is 296k and its weight causes the volume of the gas is 2.0 L?

Answer:

The new pressure is: 1.896 atm

Explanation:

At standard temperature and pressure, we have:

[tex]P_1 = 1atm[/tex]

[tex]T_1 = 273.15k[/tex]

[tex]V_1 = 3.5L[/tex]

Outside, we have:

[tex]T_2 = 296k[/tex]

[tex]V_2 = 2.0L[/tex]

Required

Determine the new pressure

Using combined gas law, we have:

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

This gives:

[tex]\frac{1 * 3.5}{273.15} =\frac{P_2*2.0}{296}[/tex]

Solve for [tex]P_2[/tex]

[tex]P_2 = \frac{296 * 1 * 3.5}{273.15*2.0}[/tex]

[tex]P_2 = \frac{1036}{546.30}[/tex]

[tex]P_2 \approx 1.896 atm[/tex]

Answer: 3.33

Explanation:

The molecular formula of the given composition is C₃H₆O₃.

Molecular formula is defined as a compound's chemical formula, which counts the total number of each element present in a molecule of the compound as discrete molecules. The arrangement of atoms in a molecule in three dimensions is known as molecular geometry, commonly referred to as the molecular structure.

The percentage composition is

C = 40.00 %

H = 6.72 %

O = 53.29 %

Mole = 100 g

Mass of C = 40 / 100 x 100 = 40 g

mass of H = 6.72 / 100 x 100 = 6.72 g

Mass of O = 53.29 / 100 x 100 = 53.29 g

Dividing the mass with moles

C = 40 / 12 = 3.3

H = 6.72 / 1 = 6.72

O = 53.29 / 16 = 3.3

Formula = C₃H₆O₃

Thus, the molecular formula of the given composition is C₃H₆O₃.  

To learn more about molecular formula, refer to the link below:

https://brainly.com/question/28647690

#SPJ2

Answer: 747.98 grams of KCl are made when 5.02 moles of  [tex]ZnCl_2[/tex] react in the reaction.

Explanation:

The balanced chemical equation is:

[tex]2KMnO_4+ZnCl_2\rightarrow 2KCl+Zn(MnO_4)_2[/tex]

According to stoichiometry:

1 mole of [tex]ZnCl_2[/tex] produce = 2 moles of [tex]KCl[/tex]

Thus 5.02 moles [tex]ZnCl_2[/tex] will produce =[tex]\frac{2}{1}\times 5.02=10.04[/tex] moles of [tex]KCl[/tex]

Mass of [tex]KCl=moles\times {\text {molar mass}}=10.04mol\times 74.5g/mol=747.98g[/tex]

Thus 747.98 grams of KCl are made when 5.02 moles of  [tex]ZnCl_2[/tex] react in the reaction.

Answer:

Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter.

ex- cheese, milk, aerosol spray, mayonnaise

Answer:

your answer gonna be 20 miles

Answer:

big brain

Explanation:

Answer:

the mass of the glycerine needed in the given solution is  23.92 g

Explanation:

Given;

molarity of the solution (C₃H₈O₃), C = 2.60 M

Volume of the solution, V = 100 mL = 100 x 10⁻³ L = 0.1 M

The molarity of a solution is given as follows;

[tex]Molarity = \frac{amount \ of \ solute \ (moles)}{volume \ of \ solution \ (L)} \\\\amount \ of \ solute \ (moles) = Molarity \ \times volume \ of \ solution \ (L)\\\\amount \ of \ solute \ (moles) = 2.6 \times 0.1 \\\\amount \ of \ solute \ (moles) = 0.26 \ mole[/tex]

The molecular mass of the given solution;

molecular mass = (12 x 3) + (8 x 1) + (16 x 3)

molecular mass = 92 g/mol

The mass of the glycerine needed in the given solution is calculated as follows;

reacting mass = amount of solute (moles)   x   molecular mass (g/mol)

reacting mass = 0.26 x 92

reacting mass = 23.92 g

Therefore, the mass of the glycerine needed in the given solution is  23.92 g

Complete question:

A ball with a weight of 0.5 kg is sitting on a shelf that is 3 meters high. What is the gravitational potential energy of the ball ?

Help me! This is 8th grade sci btw

Answer:

the gravitational potential energy of the ball is is 14.7 J.

Explanation:

mass of the ball, m = 0.5 kg

height above the ground on which the ball is sitting, h = 3 m

The gravitational potential energy of the ball is calculated as follows;

P.E = mgh

P.E = 0.5 x 9.8 x 3

P.E = 14.7 J

Therefore, the gravitational potential energy of the ball is is 14.7 J.

Answer:

They are still the same particals just. packed together diffrently depending on what stae of matter it's in.

Explanation:

Answer: should be 28 degrees

Explanation:

Answer:

Balanced equation have equal number of atoms of different elements in the side of reactants and products.

Answer:

- A balanced chemical equation has an equal numbers of atoms of different elements in the side of reactants and products.

- An unbalanced chemical equation has an unequal number of atoms of one or more elements in the reaction.

Explanation:

Answer:

A

Explanation:

The book encountered friction which turned some of the energy into heat.

Answer:

Hey mate.....

Explanation:

This is ur answer.....

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.

Hope it helps!

mark me brainliest pls....

Follow me! :)

January 19

Explanation:

every first 7 days of a month the moon roughly starts its full moon phase

Answer:

*Inserting real answer*

Explanation:

I think CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4 is the skeleton equation.

If I am wrong I am so sorry!!!

Have a nice day! :)

Also sorry for all the fake answers you have been getting that happened to me too TnT

Answer:

There are 20 neutrons in this atom.  

Explanation:

Answer:

1. There are so many ethical concerns about biotechnology, some Ethical issues that arise from the application of modern biotechnologies include:

Discrimination of individuals because of their health or health history as a result of knowing their genetic information,  minimizing harms while maximizing benefits, Interference with nature, privacy.

2. a. Plants (maize, rice)

   b. Fish (GloFish)

3. For individuals, biotechnology has helped in the prevention and treatment of a wide range of diseases. For society, biotechnology saves time, improves the health and quality of food through a reduction in the use of pesticides and it can create new viruses and bacteria that cause diseases. Biotechnology could address global change since more genetically modified plants are grown.

Answer:

5.

A. Period

B. Group

6. C

Explanation:

Answer:

Decomposition pf residues and weathering of rock.

Explanation:

Microorganisms performs two processes such as decomposition and weathering of rock materials. These two processes make the medium suitable for the growth and development of the lichens because these processes increases nutrient and organic matter on the rock surface that is used by the lichens for its growth. In decomposition process, larger compounds are broken down into simpler substances while on the other hand, the weather of rocks causes breakdown of rock material into simpler minerals that also used by the lichens.

1. figure one

2. figure two

3. figure three

4. figure two

5. figure one

Answer:

it goes A,C,B,C,A

Explanation:

Answer:

is there a picture or is it multiple choice?

Answer:

law of conservation

Explanation:

matter cannot be destroyed nor made

Answer:

There is not enough evidence

Explanation:

For  1.5 moles substrate concentration per liter

Reaction ( n2 ) = 15 runs

average velocity ( x2 ) = 7.5 micromoles per 30 minutes

standard deviation ( s2 ) = 1.5

For 2.0 moles substrate concentration per liter

Reaction( n1 ) = 12 runs

average velocity ( x1 ) = 8.8 micromoles per 30 minutes

standard deviation ( s1 )  = 1.2

Show Reason to believe that this increase in substrate conc causes an increase in mean velocity

Hypothesis test

H0 : μ1 - μ2 = 0.5

H1 : μ1 - μ2  > 0.5

level of significance ( ∝ ) = 0.01

attached below is a detailed solution to the problem

P-value ( 0.073 ) > level of significance ( 0.01 ) hence we fail to reject the null hypothesis

hence there in not enough evidence to believe that this increase causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes