Help please help me

Answer:

on your face

Explanation:

because when the light is falling on your hand (which already blocked your view of the lamp) then the shadow will fall on your face

Steel piping systems have a history of degrading under salt brine. It is possible to neutralize their corrosive effects by using sodium dichromate.

For melting snow and ice on sidewalks, parking lots, and roads, salt brine is a practical liquid solution. When the salt content of the water reaches a certain proportion, salt brine is produced in tanks that circulate certain volumes of water and rock salt. After that, the solution is pumped into holding tanks in order to be used. In order to address particular temperature ranges of a storm and improve the application's efficacy, other components like calcium or magnesium may be added.

In advance of winter weather, surfaces are pre-treated with salt brine. If Salt Brine is used ahead of a winter storm, it will start to function as soon as the first snowflake falls and assist prevent the accumulation of snow and ice on the pavement.

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Answer:

0.4 M

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

HBr + KOH —> KBr + H₂O

From the balanced equation above,

The mole ratio of the acid, HBr (nₐ) = 1

The mole ratio of the base, KOH (n₆) = 1

Finally, we shall determine the molarity of HBr. This can be obtained as follow:

Volume of acid, HBr (Vₐ) = 0.5 L

Volume of base, KOH (V₆) = 0.1 L

Molarity of base, KOH (M₆) = 2 M

Molarity of acid, HBr (Mₐ) =?

MₐVₐ / M₆V₆ = nₐ/n₆

Mₐ × 0.5 / 2 × 0.1 = 1

Mₐ × 0.5 / 0.2 = 1

Cross multiply

Mₐ × 0.5 = 0.2

Divide both side by 0.5

Mₐ = 0.2 / 0.5

Mₐ = 0.4 M

Thus, the molarity of the HBr solution is 0.4 M

Answer:

Theoretical yield of silver = 67.97 g Ag

Percent yield of the reaction = 88.3%

Explanation:

This reaction forms copper(II) nitrate instead of copper(I) nitrate.

First, we have to write the balanced chemical equation for the reaction of copper (Cu) with silver(I) nitrate (AgNO₃) to give silver (Ag) and copper(I) nitrate (CuNO₃):

Cu(s) + 2AgNO₃(aq) → 2Ag(s) + Cu(NO₃)₂(aq)

From the equation, 1 mol of Cu(s) produces 2 moles of Ag(s). We convert the moles to mass with the molecular weight (MW) of the compounds:

MW(Cu) = 63.5 g/mol

mass of Cu = 1 mol Cu x 63.5 g/mol = 63.5 g Cu

MW(Ag) = 107.9 g/mol

mass of Ag = 2 mol Ag x 107.9 g/mol = 215.8 g Ag

Thus, we have the conversion factor: 215.8 g Ag/63.5 g Cu

- From 20.0 g Cu, the following amount of Ag will be obtained:

20.0 g Cu x 215.8 g Ag/63.5 g Cu = 67.97 g Ag (theoretical amount)

- For an actual amount of 60.0 g of Ag, we calculate the percent yield as follows:

%yield = actual amount/theoretical amount x 100 =

           = 60.0 g/67.97 g x 100 = 88.3 %

Answer:

1.346 meters per second

Explanation:

You traveled 35 meters in 26 seconds

35 / 26 = avg speed.

35 / 26 = 1.346...

The element box contains name and symbol of the element, number of protons and electrons, atomic mass, and electron configuration.

Each container represents an detail and incorporates its atomic size, symbol, common atomic mass, and (sometimes) name. The factors are organized in seven horizontal rows, referred to as intervals or series, and 18 vertical columns, referred to as groups. The container containing every detail's records is called the detail key. Each key incorporates an detail's name, precise symbol, atomic weight and atomic variety. Oxygen, for example, has an atomic variety of 8, an atomic weight of 15.996 and a completely unique symbol, O. The table is split into 4 more or less square regions referred to as blocks. The rows of the desk are referred to as intervals, and the columns are referred to as groups. Elements from the equal institution of the periodic table display comparable chemical characteristics.

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Answer:

i got 12.1 as my answer hope it is right

The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.

Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.

The molar volume (Vm) is the volume occupied by one mole of a chemical element or chemical compound at standard temperature and pressure (STP). You may figure it out by dividing the mass density () by the molar mass (M).

From the ideal gas law;  V = nRT/ P

where,

n = 0.540 mol

universal gas constant R = 8.314 J/mol·K

standard temperature T = 273.15 K

standard pressure P = 101 325 Pa

Substituting the values into the formula ;

= 0.540 × 8.314 × 273.15 / 101.325

= 0.0121 m³

= 12.1 l

Thus, The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.

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Answer:

You have not shown the liquid which is to be shown, please show us

Answer:

d on edge my guys.

Explanation:

The block has a density of 7.3 g/ml. The density is the same as for tin. Tin is the metal's true identity.

Absolute population and particle density are the two main types of density. Relative density, also called as coarse aggregate, is the ratio of a substance's density to the volume of a reference substance. The reference substance is often water.

The density of a substance is a measurement of its thickness in relation to its volume. A product will float in a solution if its density is lower than the water's, while it will sink if it has a higher density.

Density of the block can be calculate as follows:

Volume of metal = 1xb×h

I = 0.5839 in

b = 0.531 in

h = 0.4981 in

volume = 0.5839×0.531×0.4981

=0.1544363

=2.53ml

mass of metal =1.84×10⁴ mg

=18.4 g

density = g/ml

=18.4/2.53

=7.3 g/ml

from its density we can conclude the block of metal is Tin

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The normal boiling point for acetone is 56.5°C. At an elevation of 5300 ft the atmospheric pressure is 630. torr. The vapor pressure of acetone at 22.0°C at this elevation is 212.22 torr.

The equilibrium pressure of a vapour above its liquid (or solid), or the pressure of the vapour produced by the evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container, is the vapour pressure of a liquid. Substance; vapour pressure at 25 °C, as examples.

In Step 1:

The normal boiling point for acetone = 56.5°C.

At an elevation of 5300 ft the atmospheric pressure = 630 torr

ΔHvap = 32.0 kJ/mol

The temperature is 24.0 °C

In Step 2:

ln(p1/p2) = (∆ H/R) (1/T2 - 1/T1)

Normal atmospheric pressure

= 1 atm

= 760 torr

So, (760/630) = ((32.000 J/mol) / (8.314 J/K*mol)) (1/T2 - 1/329.65 K).

T2 = 324.4 K = 51.25 °C.  

This is the boiling point of acetone at 5300 ft.

The vapor pressure = atmospheric pressure at the boiling point for any liquid.

ln (Pv/630atm) = ((32.000 J/mol) / (8.314 J/K*mol)) (1/324.4 K - 1/297.15)

ln (Pv/630) = -13615388.3

Pv = 212.22 torr

Thus, The vapor pressure of acetone at 22.0°C at this elevation is 212.22 torr.

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When gas is removed from a container with a fixed volume, the number of gas particles decreases, so there are fewer collisions and thus less pressure.

Additionally, the remaining gas particles have more space to move around, which also leads to a decrease in pressure. This can be visualized in the drawing by the decrease in the number of gas particles and the increased distance between them as gas is removed from the container.

As the gas particles decrease, there are fewer particles to collide with the walls of the container and therefore less force is exerted on the walls. This results in a decrease in the pressure inside the container.

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The statement given is true. No matter where you live or what the outside temperature is, you should always start your vehicle and let it warm up for a few minutes.

An object's thermal energy content is measured by its temperature, while heat is the movement of thermal energy between objects of different temperatures.

The average kinetic energy of all the atoms or molecules that make up matter defines temperature in chemistry. Not all materials have the same kinetic energy. A particle can be described using the kinetic energy distribution of the particle at a point in time.

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The complete question is as follows:

Regardless of where you live and what temperature it is outside, you should always start the vehicle and give it a few minutes to warm up. (True/False)

Answer:

Its B

Explanation: I did the test passed btw

Answer: Not moving at all?

Explanation:

...

The propensity of an atom of a certain chemical element to draw shared electrons when forming a chemical bond is known as electronegativity and is denoted by the symbol X.

The atomic number and the separation of the valence electrons from the charged nucleus have an impact on an atom's electronegativity. An atom or a substituent group will draw electrons in greater amounts the higher the associated electronegativity. The sign and amplitude of a bond's chemical polarity, which characterizes a bond along the continuous scale from covalent to ionic bonding, can be quantitatively estimated using electronegativity. The inverse of electronegativity is electropositivity, which describes an element's propensity to accept valence electrons.

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Answer:

At STP, 1 mole of gas occupies 22.4 L. That means 0.25mol of H2 gas will take up 5.6 L of space.

Answer:

7. .........................

For a certain brand of gasoline, which has a density of 0.733 g/mL at 25 oC, 41848 grammes would fill a 10.7 gal tank. Mass in relation to volume is referred to as density.

Although the Latin letter D can also be used, the symbol for density is most frequently written as (the lower case Greek letter rho). Any combination of gases can be considered a gas gas solution. As a result of their great distance from one another, gas molecules typically only interact very little. All gases can therefore be thought of as being soluble in one another.

15x 3785.41 ml = 56781.15 ml. Consequently, the mass is calculated as 0.737g/ml x 56781.15 ml = 41848 grammes.

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Answer:

4.5x10⁻¹¹M is the hydronium ion concentration

Explanation:

To solve this concentration we must find, as first, the molar concentration of OH-, [OH-]. With [OH-] we can find pOH, pH, and [H+], hydronium ion concentration, as follows:

[OH-]:

1mol of Ca(OH)2 contains 2 moles of OH-:

0.00011M Ca(OH)2 * (2moles OH- / 1mol Ca(OH)2) = 0.00022M OH-

pOH:

pOH = -log[OH-]

pOH = 3.658

pH:

pH = 14-pOH

pH = 10.34

[H+]:

10^-pH

Two isomers are Butadiene Bicyclobutane.

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There is no movement of heat. The Zeroth Law of Thermodynamics states that if two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.

Thermodynamics is the study of energy and its transformations. It examines the relationships between heat, work, and other forms of energy. The fundamental laws of thermodynamics provide a framework for studying the behavior of systems, whether they are physical, chemical, or biological in nature. Thermodynamics helps us understand the behavior of gases, liquids, and solids and how they interact with each other. It also provides us with a way to analyze how energy is transferred and used in various processes.

In other words, no heat transfer takes place between two systems that are in thermal equilibrium.

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An experimental group and a control group are both included in a controlled experiment. At least one of the two groups—the group that is not subjected to the experimental treatment—is present in a controlled experiment.    

In controlled experiment, the researcher wants to determine how one or more variables affects on something. Since many different variables affecting the results, and most of them are not of interest to the researcher, and they will kept under control. They must remain constant. There must be at least of two groups. One of them is control group, and the other one is experimental group.  

During experiment, a researcher compares between two groups. Both are composed of individuals which is coming from same population, so they are very identical in all the aspects except for independent variables that the researcher changes in to the  experimental group and they observe that how they will affect the individuals.  Control group is used to identify any of the other factors influencing the results which is obtained in the study, apart from the modified variables of the treatment. Independent variable keeps constant in control group.  

The experimental group receives the treatment. The researcher voluntarily modifies the independent variable's values to see how it impacts the subjects. There can be several experimental groups.

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Answer:

Using the VSEPR theory, the electron bond pairs and lone pairs on the center atom will help us predict the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize attraction.

Answer:

The Circuit will be OPEN since the current source is disconnected.

So if its not turned on... The circuit remains Open

Answer

Option A.

The pressure inside the container with 5 moles of gas, 62 liters volume and 222K temperature is 1.46 atm.

Ideal gas law illustrates the relation between pressure, volume and temperature of a gas. It is represented by the equation

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature.

V = 62 liters

n = 5 moles

R = 0.0821  L(atm) mol⁻¹K⁻¹

T = 222K

PV = nRT

P × 62 = 5 × 0.0821 × 222

P = 5 × 0.0821 × 222/62

P = 1.46 atm

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Answer:

It is higher in Norfolk because of the warm ocean currents from the south

Explanation:

Can I have brainliest answer please?

0.0859 mol N2O5

Explanation:

First convert the # of grams of NO2 to moles:

7.90 g NO2 × (1 mol NO2/46.0055 g NO2)

= 0.172 mol NO2

Use the molar ratio to find the # moles of N2O5

0.172 mol NO2 × (2 mol N2O5/4 mol NO2)

= 0.0859 mol N2O5

Answer:

6.82 Mol CO2

Explanation: