What do these two changes have in common?
sediment settling to the bottom of a muddy puddle
a puddle freezing into ice on a cold night
Select all that apply.
Both are chemical changes.
Both are changes of state.
Both are caused by heating.
Both are only physical changes.

Answer:

the salt is a solute in this instance

Answer: The gas would occupy volume of 221 ml at STP

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

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

where,

[tex]P_1[/tex] = initial pressure of gas = 720 torr

[tex]P_2[/tex] = final pressure of gas = 760 torr (at STP)

[tex]V_1[/tex] = initial volume of gas = 250 ml

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = [tex]20^oC=273+20=293K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]273K[/tex]   (at STP)

Now put all the given values in the above equation, we get:

[tex]\frac{720\times 250}{293}=\frac{760\times V_2}{273}[/tex]

[tex]V_2=221ml[/tex]

The gas would occupy volume of 221 ml at STP

Answer:

-1, -4

Explanation:

[tex]x^2+4x+5=0[/tex]

Factoring, you get:

[tex](x+4)(x+1)=0[/tex]

To find what x can be, you need to realize what could make this equation true. To set the left side equal to 0, either one of the terms in parentheses must be equal to 0. To do that, x must be the negative of the other term, so that they can cancel each other out. Therefore, x is -4 and -1. Hope this helps!

Answer:

-1,-4

Explanation:

Hey!!

Here's your answer

Thermal energy is the energy that is generated or measured by heat.

Thermal energy measures the movement of atoms or molecules within a substance.

Hope it helps

-Carrie

A liquid with a mass of 27g and a volume of 30 ml has a density is 0.9 g/ml.

You follow the same procedure as you would for a solid to determine the density of a liquid. Determine the fluid's volume, mass it, and then divide mass by volume.

Weigh the fluid in the container, pour it out, weigh the empty container, and then subtract the empty container's mass from the mass of the filled container to get the fluid's mass.

Calculate the substance's density in mg/mL, it is 1000 mg/mL for water. You may calculate the quantity in milliliters by dividing the milligram amount by the density.

Therefore, one of the most important ones is that a substance's density will influence whether it will float on another, 0.9 g/ml is the density of a liquid.

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Answer:

The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. ... When the moon is between the Earth and the sun, during the new moon phase, the back side of the moon is bathed in daylight.

Explanation: endg 2020 ;]

Answer:

D got it right on edge 2020

Explanation:

Explanation:

Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria

Answer:

Chloroplast, mitochondria

Explanation:

Photosynthesis is a process that plants, algae, and some bacteria use to make their own food. They take light energy, carbon dioxide and water and produce glucose and oxygen. This process takes place in the chloroplasts.

Animals and plants both use a process called cellular respiration. This process takes glucose and oxygen, and creates ATP, carbon dioxide and water. Animals and plants use ATP to move, grow, and carry out cellular functions. This process takes place in the mitochondria.

Answer:

yes ,it is a physical change

Explanation:

because physical change can be reversed which means that boiling water can be reversed back

Answer:

One mole of SnO2

Explanation:

SnO2(s) + 2H2(g) ------> Sn(s) + 2H2O(l)

In every question that has to do with stoichiometry, the balanced reaction equation is the first step towards obtaining the correct answer because it serves as a guide in solving the question.

From the balanced reaction equation, we have

1 mole of SnO2 reacts with 2 moles of hydrogen gas to yield two moles of water.

The balanced reaction equation represents one mole of SnO2.

Hence the answer.

Answer:

A

Explanation:

You will convert 750mL into litters which will be .75 litters. Then you divide the moles by litters Morality / .75 Litters. when you do the math you will get 6.9

Explanation:

A. Solve the answer using stoichiometry.  This means that you have to look at the coefficients of the equation to solve this.

The problem gave the moles of propane used to form product.  Your job is to find the moles of product formed.  Use the equation to solve this.  The coefficients represent moles.

Propane has no coefficient implying that the number in front of propane would be 1.  CO₂ has a coefficient of 3, and H₂O has a coefficient of 4.  This means that for every mole of propane, 3 moles of CO₂ and 4 moles of H₂O are formed.

Multiply the moles of propane by the coefficients of the products.

3.85 × 3 = 11.55 mol CO₂

3.85 × 4 = 15.4 mol H₂O

You have solved for moles of each product.

B. This problem has about the same concept as the one before.  Look at the equation.  For every 5 moles of O₂, 3 moles of CO₂ and 4 moles of H₂O are formed.  For every 5 moles of O₂, 1 mole of propane is needed.

This time, however, you cannot simply multiply the amount of moles by the coefficient.  This is because you need 5 moles, not 1, to get that many moles produced.

This time, multiply the moles by the coefficients over the original coefficient.

0.647 × 3/5 = 0.388 mol CO₂

0.647 × 4/5 = 0.518 mol H₂O

0.647 × 1/5 = 0.129 mol C₃H₈

Moles of CO₂ and H₂O are produced by the 3.85 mol of propane is 11.55 and 15.4 moles respectively.

Stoichiometry of the reaction tells about the amount of species present before and after the completion of reaction.

Given chemical reaction is :
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

From the stoichiometry of the reaction it is clear that:

1 mole of C₃H₈ = produces 3 moles of CO₂

1 mole of C₃H₈ = produces 4 moles of H₂O

1 mole of C₃H₈ = reacts with 5 moles of O₂

5 moles of O₂ = produces 3 moles of CO₂

5 moles of O₂ = produces 4 moles of H₂O

5 moles of O₂ = reacts with 1 mole of C₃H₈

Hence required moles are calculated above.

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Answer:

c

Explanation:

took it

Answer:

C) 0 to +3 as electrons are transferred

Explanation:

[tex]Fe_{2}O_{3} + 2Al^{0} --> Al^{+3}_{2}O_{3} + 2Fe\\\\Al^{0} -3e^{-}--> Al^{+3}[/tex]

Answer:

a. 1.01 molar solution

Explanation:

Now we have to recall the formula;

n= CV

Where

n= number of moles of magnesium oxide

C= concentration of magnesium oxide solution = ???

V= volume of magnesium oxide solution= 365 ml

But;

n= m/M

Where;

m= given mass of magnesium oxide= 14.2 g

M= molar mass of magnesium oxide= 40.3044 g/mol

Substituting values;

14.2g/40.3044 g/mol = C×365/1000

0.3523= 0.365 C

C= 0.3523/0.365

C= 0.965

C= 1.00 molar (approx)

Answer:

Option A. 1.01 molar solution

Explanation:

Step 1:

Data obtained from the question. This include the following:

Mass of MgO = 14.92g

Volume of solution = 365mL

Molarity of solution =.?

Step 2:

Determination of the number of mole present in 14.92g of MgO.

This is illustrated below:

Mass of MgO = 14.92g

Molar mass of MgO = 24.3 + 16 = 40.3g/mol

Number of mole MgO =...?

Mole = Mass /Molar Mass

Number of mole of MgO = 14.92/40.3 = 0.370 mole

Step 3:

Determination of the molarity of the solution.

This can be obtained as follow:

Mole of MgO = 0.370 mole

Volume = 365mL = 365/1000 = 0.365L

Molarity =..?

Molarity = mole /Volume

Molarity = 0.370/0.365

Molarity = 1.01M

Answer:

Hotter climate, more greenhouse gases, and less water

I hope this helps :)

Explanation:

Answer: crest

Explanation:

X is pointing to the peak of the wave. Hence, the answer is the third option: crest.

Answer:

The answer is crest

Explanation:

The highest surface part of a wave is called the crest

Explanation:

B. sound waves can diffract.

....,........

Answer:

This is False.

Explanation:

Acid=0-6

Neutral=7

Base=8-14

Answer:

Explanation:

An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element. The nuclei of most atom s contain neutrons as well as protons

Answer:

= 2.33 L

Explanation:

V1/T1 = V2/T2

V1 = 3.0 L

T1 = 78 + 273

   = 351 K

At s.t.p the temperature is 273 K and pressure is 1 atm.

V2 = ?

T2 = 273 K

V2 = V1T2/T1

    = (3.0 ×273)/351

    = 2.33 L

Explanation:

ik it is confusing but that is what i got

Answer:

Thanks

Explanation:

Answer:OVERDOSE

Explanation: Because when take a addictive drug you mostliky took too much and u cant stop.

Answer:

OVERDOSE

Explanation:

and this is not for question but on Netflix put the code 7424 in the search bar to get all of the anime on Netflix

Answer:

soil is fertile this is reason that scientists would not be kept constant

Answer:

Fertilizer

Explanation:

Constants are the parts in a experiment that are kept the same throughout the experiment. Some examples for this experiment could be growing environment, temperature, humidity, amount of water given each day, and the time in the sun.

In this experiment, the scientist is testing the effect of fertilizer on plant growth. Therefore, if the scientist wants to truly test the effect of fertilizer, they would not be able to keep the fertilizer constant. If it was kept constant, there wouldn't be any experiment, because we would use the same amount or type of fertilizer in every trial.

Therefore, the factor that would not be kept constant would be the fertilizer.

When it is tilted away from the Sun, it is winter in the northern hemisphere. In between we have autumn and spring. The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. This is the longest day (most daylight hours) of the year for people living in the northern hemisphere.

Answer:

ants and flys

Explanation:

Answer:

A subscript is a character, usually a letter or number, that's printed slightly below and to the side of another character. Subscripts are commonly used in chemical formulas. ... It's closely related to superscript, when a letter or number is printed above another character.

2

Explanation:

50/50 chance of getting correct

Answer:

D

Explanation:

An elephant standing in one place without moving is in static equilibrium. Therefore, option D is correct.

Static equilibrium can be described as the sum of the exerting torques and forces on each part of the body that happens to be null.

In the static equilibrium of a body whose parts are in a state of rest. The essential condition for this type of equilibrium is that a body is not showing any form of movement.

In translational equilibrium, a body is not moving from one point to another while in rotational equilibrium is not spinning around a point. Translational equilibrium requires the sum of every outside force to be zero. Torque can be defined as a quantity that exerts the rotational movement of an object.

If two forces are acting on a body that is in the state of static equilibrium, where the total sum of forces is zero. Therefore, for the elephant standing in one place without moving there are only two forces i.e. the weight of the elephant and the normal force to balance it. Therefore, it describes in static equilibrium.

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