Can light from the sun cause ink to become visible

Answer:

air presure pushes things and the wind is a gust of air

Explanation:

The force of gravity points straight down, but a ball rolling down a ramp doesn't go straight down, it follows the ramp. Therefore, only the component of the gravitational force which points along the direction of the ball's motion can accelerate the ball. The other component pushes the ball into the ramp, and the ramp pushes back, so there is no acceleration of the ball into the ramp. If the ramp is horizontal, then the ball does not accelerate, as gravity pushes the ball into the ramp and not along the surface of the ramp. If the ramp is vertical, the ball just drops with acceleration due to gravity. These arguments are changed a bit by the fact that the ball is rolling and not sliding, but that only affects the magnitude of the acceleration but not the fact that it increases with ramp steepness.

Answer:

[tex]M=0.0513M[/tex]

Explanation:

Hello!

In this case, since the molarity of a solution is computed by dividing the moles of solute by the volume of solution, we notice we first need the moles of KHP as shown below:

[tex]n=0.5237g*\frac{1mol}{204.22 g} =0.00256mol[/tex]

Next, the volume in liters:

[tex]V=50.0mL*\frac{1L}{1000mL}\\\\V=0.0500L[/tex]

Thus, the molarity turns out to be:

[tex]M=\frac{n}{V}\\\\M=\frac{0.00256mol}{0.05000L} \\\\M=0.0513M[/tex]

Best regards!

Answer:

720 divided by 2 answer is 556 so answer per is 3.32.3

Explanation:

Answer:

I will go for a heterogeneous mixture

Explanation:

alloy is basically a mixture

Answer: A

Explanation: i took the test

Answer: 1.825 moles of hydrogen gas are produced.

Explanation:

The balanced chemical equation is:

[tex]Mg(s)+2HCl(aq)\rightarrow H_2(g)+MgCl_2(aq)[/tex]  

According to stoichiometry :

2 moles of [tex]HCl[/tex] require = 1 mole of [tex]Mg[/tex]

Thus 3.65 moles of [tex]HCl[/tex] will require=[tex]\frac{1}{2}\times 3.65=1.825moles[/tex]  of [tex]Mg[/tex]

Thus [tex]HCl[/tex] is the limiting reagent as it limits the formation of product and [tex]Mg[/tex] is the excess reagent.

As 2 moles of [tex]HCl[/tex] give = 1 mole of [tex]H_2[/tex]

Thus 3.65 moles of [tex]HCl[/tex] give =[tex]\frac{1}{2}\times 3.65=1.825moles[/tex]  of [tex]H_2[/tex]

Thus 1.825 moles of hydrogen gas are produced.

Answer:

2365 g

Explanation:

The mass of CaCl₂ will be 110.98 grams, this can be calculated by using the molarity formula.

It is defined as the ratio of a number of moles of solute to the volume of solution in liters.

It is given by:

M= n/V

What information do we have?

V= 1.0 L

M= 1.0 M

Molar mass of CaCl₂  = 110.98g/mol

To find:

m=?

M= n/V

n= M/V

n= 1 mole

A Number of moles is the ratio of mass over the molar mass.

n = m/ M

1 mole= m / 110.98 g/mol

m= 110.98 grams

Thus, the mass of calcium chloride is 110.98 grams.

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The given question is incomplete. The complete question is:

A brick has a mass of 4.0 kg and the earth has a mass of [tex]6.0\times 10^{27}g[/tex] Use this information to answer the questions below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of bricks? Round your answer to 2 significant digits. How many moles of bricks have a mass equal to the mass of the Earth? Round your answer to 2 significant digits.

Answer: The mass of 1 mole of bricks is [tex]2.4\times 10^{27}g[/tex]

2.5 moles of bricks have a mass equal to the mass of the Earth

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

Mass of 1 brick = 4.0 kg = 4000 g     (1kg=1000g)

Thus mass of 1 mole of brick or [tex]6.023\times 10^{23}[/tex] bricks will be = [tex]\frac{4000g}{1}\times 6.023\times 10^{23}=2.4\times 10^{27}g[/tex]

The mass of 1 mole of bricks is [tex]2.4\times 10^{27}g[/tex]

Now [tex]2.4\times 10^{27}g[/tex] will correspond to = 1 mole of bricks

[tex]6.0\times 10^{27}g[/tex] will correspond to =[tex]\frac{1}{2.4\times 10^{27}}\times 6.0\times 10^{27}=2.5moles[/tex]

2.5 moles of bricks have a mass equal to the mass of the Earth

2 Ca + 2H2O ⇒ 2 Ca(OH)2 + H2

Explanation: number of atoms of every element

Need to be equal in both sides

The right ratio of chemicals for the balanced chemical equation is  2Ca + 2H₂O ⇒ 2 Ca( OH )₂ + H₂.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

Because mass cannot be generated or destroyed, according to the rule of conservation of mass, a chemical equation must always be in balance.

A chemical equation must be balanced. This is so that it can convey how many moles are reacting and creating. The amount of electrons that are transferred from one substance to another is also indicated. An equation that balances or is balanced also describes how energy is changed.

Thus, the balanced chemical equation is  2Ca + 2H₂O ⇒ 2 Ca( OH )₂ + H₂.

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The change which shift the equilibrium to produce the maximum possible amount of SO₃ is decreasing the temperature.

According to this principle if any external stress is applied in the equilibrium state then equilibrium will shift towards that side where the external stress will decreases.

In the given chemical equation energy is releases in the form of heat, then in this condition:

Hence decreasing the temperature will produce maximum SO₃.

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Answer:

The technique is called weighing by difference

Answer:

pH = 3.34

Explanation:

We can calculate the pH using Henderson-Hasselbach's equation:

for HCOOH, pKa = 3.75.

We can calculate [HCOO⁻] and [HCOOH] using the given number of moles for each one and the final volume:

Then we proceed to calculate the pH:

The pH of the resulting solution is 3.34.

Since  

Final Volume = 44.12 mL + 250 mL = 294 mL

Now

= 294 mL / 1000

= 0.294 L

Now

[HCOO⁻] = 0.036 mol / 0.294 L = 0.122 M

[HCOOH] = 0.091 mol / 0.294 L = 0.310 M

So, the pH should be

= 3.75 + log0.122/0.310

= 3.34

hence, The pH of the resulting solution is 3.34.

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Answer:

True

Explanation:

Answer:

option d is right

Explanation:

More precipitation occurs near the equator because it is a tropical area. Mountains receive less than 15 inches of rain per year while the equator area receives a lot of rain. This is due to the very hot weather.

The climate around the equator will have more precipitation because it is very hot.

thats the answer

Answer:

277.0g of CO₂ is theoretical yield

Explanation:

In the reaction, 2 moles of C₄H₁₀ react with 8 moles of CO₂.

To solve this question, we must convert the volume of the C₄H₁₀to moles. Then, using the chemical reaction, find the moles of CO₂ produced and its mass as follows:

PV = nRT

Assuming STP conditions:

P = 1atm

V = 35.5L

n are moles

R = 0.082atmL/molK

T = 273.15K

Replacing:

n = PV/RT

n = 1atm*35.25L / 0.082atmL/molK*273.15K

n = 1.574 moles C₄H₁₀

Assuming all these moles are converted in CO₂ (theoretical yield), the moles of carbon dioxide are:

1.574 moles C₄H₁₀ * (8mol CO₂ / 2mol C₄H₁₀) = 6.295 moles CO₂

And the theoretical yield in mass is:

6.295 moles CO₂ * (44.01g / mol) =

Answer:

Fossils are traces of organisms that lived in the past. When fossils are found, they are analyzed to determine the age of the fossil. The absolute age of the fossil can be determined through radiometric dating and determining the layer of rock in which the fossil was found.

Explanation:

The reaction in the chemical cell has been best classified as the redox reaction. Thus, option B is correct.

The reaction cell or the voltaic cell has been the one that has been able to convert electrical energy into chemical energy. In the chemical cell, electrical energy has been provided to the cell for bringing the chemical change.

The chemical change has been brought by the oxidation and reduction of the elements with the application of electric current. The reaction that has been based on the oxidation and reduction of the elements has been termed the redox reaction.

Thus, the reaction in the chemical cell has been best classified as the redox reaction. Thus, option B is correct.

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The diffusion of solutes through transport proteins in the plasma membrane is referred to as facilitated diffusion. Passive transport is a subset of facilitated diffusion. Facilitated diffusion is still passive transport even though it uses transport proteins.

In contrast to passive diffusion, assisted diffusion does not result in the carried molecules dissolving in the phospholipid bilayer. Proteins instead allow the delivered molecules to pass through the membrane without coming into contact with its hydrophobic interior.

Materials move across the plasma membrane with the aid of membrane proteins during facilitated transport, also known as facilitated diffusion.

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that temperature is saturated.

Answer:

A. Water particles barely move forward; they move in a circular pattern.

Answer:

For k-12 its:

Explanation:

Water particles barely move forward; they move in a circular pattern.

^^

Answer:

reaction between oxygen and hydrocarbon is combustion

The compound would most likely be the reactants in a combustion reaction is oxygen and hydrocarbon.

Those reaction in which a fuel will change into a water molecule and carbon dioxide gas, in the presence of oxygen is known as combustion reaction.

Combustion reaction will represent as:

CₓHₙ + O₂ → H₂O + CO₂, where

CₓHₙ is a hydrocarbon which gets oxidized in the presence of oxygen oxidant.

Hence option (2) is correct i.e. oxygen and hydrocarbon.

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Answer:

How fans work....Instead of sucking in hot air and pushing it down, the fan sucks up cool air and pushes it higher. When the fan forces cool air higher, the cool air forces warm air down. Instead of giving you more access to cool air in your room, the fan gives you more access to the warm air, making you feel nice and cozy.

What fans do....A fan, or a breeze, helps by replacing this hot, humid air with cooler, drier air that allows for more evaporation. Similarly, even without sweat, our body loses heat to the surrounding air simply by convection. ... The breeze from the fan carries that hot air away and perpetuates the process, effectively cooling you off.

Explanation:

Answer:

The volume of  5.0 g CO  2  is  2.6 L CO  2  at STP

Explanation:

STP

STP is currently  

0

∘

C

or  

273.15 K

, which are equal, though the Kelvin temperature scale is used for gas laws; and pressure is  

10

5

.

Pascals (Pa)

, but most people use  

100 kPa

, which is equal to  

10

5

.

Pa

.

You will use the ideal gas law to answer this question. Its formula is:

P

V

=

n

R

T

,

where  

P

is pressure,  

V

is volume,  

n

is moles,  

R

is a gas constant, and  

T

is temperature in Kelvins.

Determine moles

You may have noticed that the equation requires moles  

(

n

)

, but you have been given the mass of  

CO

2

. To determine moles, you multiply the given mass by the inverse of the molar mass of  

CO

2

, which is  

44.009 g/mol

.

5.0

g CO

2

×

1

mol CO

2

44.009

g CO

2

=

0.1136 mol CO

2

Organize your data

.

Given/Known

P

=

100 kPa

n

=

0.1136 mol

R

=

8.3145 L kPa K

−

1

mol

−

1

https://en.wikipedia.org/wiki/Gas_constant

T

=

273.15 K

Unknown:  

V

Solve for volume using the ideal gas law.

Rearrange the formula to isolate  

V

. Insert your data into the equation and solve.

V

=

n

R

T

P

V

=

0.1136

mol

×

8.3145

.

L

kPa

K

−

1

mol

−

1

×

273.15

K

100

kPa

=

2.6 L CO

2

rounded to two significant figures due to  

5.0 g

Answer link

Doc048

May 18, 2017

I got 2.55 Liters

Explanation:

1 mole of any gas at STP = 22.4 Liters

5

g

C

O

2

(

g

)

=

5

g

44

(

g

mole

)

=

0.114

mole

C

O

2

(

g

)

Volume of 0.114 mole  

C

O

2

(

g

)

= (0.114 mole)(22.4 L/mole) = 2.55 Liters  

C

O

2

(g) at STP

Answer:

The is 4. Like with many things about our planet it is caused by Humans and Nature, I belive because droughts can be caused by humans and nature.

Explanation: Humans cut trees down trees , which trigger droughts to happen. Also because when humans cut a widespread of trees down just for fuel, it can potentially reduce the soil's ability to hold water ... triggering droughts to happen. But also droughts can happen just by nature.

Answer:

C. Aqueous Solutions

General Formulas and Concepts:

Aqueous Solutions'

Explanation:

Water is the universal solution that solvents are dissolved in. Whenever anything is dissolved in water, it will be an aqueous solution.

Strong ionic solutions dissolve into their ions when dissolved in water.

Weak acids and bases don't fully dissociate in water.

Answer:

yqujsbr

Explanation:

hejsudh2ihdg4 they t sjh5c4uSvreju5 aur bd84kskythddok6vr for

Answer:

redox reaction

Explanation:

:D

Answer:

The reaction between metallic aluminum and hydrochloric acid is what is known as an oxidation-reduction reaction or redox reaction. Both oxidation and reduction take place simultaneously.

In H4SiO4, the mole ratio of carbon to hydrogen to oxygen is the same as described in the question. Therefore H4SiO4 is the empirical formula

I hope this helps you!!

Answer:

barium sulfate

Explanation: