pls i need help with this

Answer:

2 moles

Explanation:

Answer:  Blood alcohol levels at autopsy are valid up to 48 hours after death when simple principles are observed in the collection and storage of samples. Alcohol levels in samples of blood taken from the intact heart are as significant as levels of blood from the femoral veins.

Explanation:

Answer:

If the victim was submerged in water

Explanation:

Answer:

Explanation:

Standard enthalpy of combustion (ΔH∘C) is the enthalpy change when 1 mole of a substance burns under standard state conditions;

Answer:

A - The can was open and gases were released.

Answer:

True

Explanation:

Question - Rifampin has a long aliphatic chain forming a bridge between an aromatic moiety (naphthaline).

Solution -

It is a true statement.

So,

The correct option is - True.

Reason -

Rifampin has a long aliphatic chain forming a bridge between an aromatic moiety (naphthaline)

Answer:

an orange would be considered a fruit

Explanation:

fruits have seeds while vegetables do not

Formation of RnF₃⁺ will nat takes place easily or if it is form then it will decompose easily.

Lewis dot structure of any compound tells about the bonding and outermost electrons present in all the entities present in that compound.

Radon is a noble gas atom and have stable electronic configuration, but still they form radon flouride products due to the high electronegativity of flourine it attracts the lone pair of electrons of radon.

For the formation of compound promotion of 1, 2 or 3 electrons from the 6p orbital to the vaccant 6d orbitals will give rise to 2, 4 or half filled orbitals so they will form only products with odd number of atoms.

Hence RnF₃⁺ will not form any compound.

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The mass of the compound is calculated by freezing point depression formula which is ΔTf=Kf×W₂×1000/M₂×W₁ which is equal to 3125 g.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.

Freezing point depression is calculated by the formula, ΔTf=Kf×W₂×1000/M₂×W₁ .Therefore,W₁=5.12×75×1000/0.48×256=3125 g.

Thus, mass of compound is 3125 g.

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Answer:

b. 4.00 m/s

Explanation:

divide the waves by the time

5÷1.25=4

Answer:

1086.2 L

Explanation:

The computation of the volume of the elevation is given below:

Here we assume the volume of the elevation be x

As we know that

V¹ ÷ T¹ = V² ÷ T²

Here

V^1 = 1500

T^1 = 290

V^2 = x

T^2 = 210

Now place these values to the above formula

So,  

1500 ÷ 290 = x ÷ 210

x = 1086.2 L

Velocity is a vector quantity that describes the rate and direction of an object's motion.

a) The velocity of the fluid:

V = 35 gpm / (π * (1.05 in)^2 / 4) = 7.09 ft/s

b) Reynolds number:

Re = (62.3 lbm/ft^3 * 7.09 ft/s * 1.05 in) / (1.2 cP) = 4,211.9

[2]- a) Expression to find pressure of methane gas at point B:

PB = PA + rgh

b) Pressure of methane gas at point B:

PB = 1,000 psig + (0.072 lbm/ft^3 * 32.2 ft * 0.0689 psia/ft) = 1,233.5 psig

c) Pressure of oil at point C:

PC = PB - 0.433 psia/ft * 32.2 ft = 1,093.3 psig

[3]- Expression to find pressure of inlet water Pw needed to displace oil:

Pw = PC + (σ / r) * (h2 - h1)

Pw = 1,093.3 psig + (σ / 0.072 lbm/ft^3) * (32.2 ft - 0 ft) = 1,093.3 psig + (σ / 0.072 lbm/ft^3) * 32.2 ft.

What is velocity?

Velocity is a vector quantity that describes the rate and direction of an object's motion. It is commonly represented by the symbol 'v' and is measured in meters per second (m/s). Velocity includes both the speed and the direction of the object. For example, if an object is moving north at 10 m/s, its velocity would be 10 m/s north. Velocity can also be determined by taking the derivative of the position function with respect to time.

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Answer:

71.1 mol CO2 ( 1 mol CH4 / 1 mol CO2 ) = 71.1 mol CH4 produced

Explanation:

Answer:

142.2 mol H2O

Explanation:

The chemical reaction is

4H2 + CO2 ---> CH4 + 2H2O

71.1 mol CO2 × (2 mol H2O / 1 mol CO2)

= 142.2 mol CO2

Answer:

The formula for kinetic energy is KE= 1/2mv²

Explanation:

Hope it helps you

PLS RATE AS BRAINLIEST ANSWER

Answer:

Molarity =Moles of solute/Volume of Solution (L)

Molarity=2.5/2.6

=0.962M

Answer:

234

Explanation:

From the question given above, the following data were obtained:

Alpha particle => ⁴₂He

²³⁸₉₂U —> ? + ⁴₂He

Let the unknown be ⁿₓZ. Thus, the equation becomes

²³⁸₉₂U —> ⁿₓZ + ⁴₂He

Next, we shall determine x, y and Z. This can be obtained as follow:

92 = x + 2

Collect like terms

92 – 2 = x

90 = x

x = 90

238 = n + 4

Collect like terms

238 – 4 = n

234 = n

n = 234

ⁿₓZ => ²³⁴₉₀Z => ²³⁴₉₀Th

Thus the balanced equation

²³⁸₉₂U —> ²³⁴₉₀Th + ⁴₂He

Therefore, the atomic mass of the first element is 234

Answer:

A: 234

B: 90

C: Th

D: 4

E: 2

F: He

Thank You!

Answer:

imaginary because i see no line.

Explanation:

Electrons first occupy the position in lowest possible energy.

orbital diagrams:-

The higher the energy level, the Third energy the electrons in that level have. On the orbital diagram, fill in the boxes to label the representations of an orbital and a sublevel.   2   electrons can occupy a single orbital, and these electrons have Opposite spin. Within a sublevel, all the orbitals fill with one electron, each of which has the Positive spin before a second electron fills any of the orbitals.

what is Orbital?

Each energy position is made up of areas known as an orbital. An orbital is an area of probability in which electrons can be set up. Each energy position, except for the first, has further than one orbital. Each orbital has a specific shape.

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Given-

Hydrogen ion concentration pH = 0.008

Now,

we know that pH + pOH = 14

pOH = 14-0.008

pOH = 13.992

Answer:

the answer to this is 71.0 grams of chlorine

In KClO3, the proportions of K, Cl, and O are 31.9%, 28.9%, and 39.1%, respectively.

There are three ways to define bases and acids. A strong base and a strong acid, respectively, called KOH K O H and HClO3 H C l O 3, react to form KClO3 K C l O 3, a salt.

A powerful oxidising agent with several applications is potassium chlorate (KClO3). It is or has formerly been a part of fireworks, explosives, safety matches, and disinfectants. The disproportionation of sodium hypochlorite results in the formation of sodium chloride and sodium chlorate initially.

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The mass of an atom of element Z is 4 amu. This can be determined by subtracting the mass of an atom of carbon (12 amu) and an atom of oxygen (16 amu) from double the mass of an atom of oxygen (32 amu). 32 amu - 12 amu - 16 amu = 4 amu.

An atom of carbon is a basic building block of all organic materials. It is the 6th element in the periodic table and has an atomic number of 6. Carbon atoms have 6 protons and 6 neutrons, and have a valence of 4. This means that carbon atoms can form four bonds with other atoms. Carbon is the basis of all life on Earth, as it is essential for the formation of proteins, fatty acids, and other molecules necessary for life. Carbon atoms have the ability to form a wide variety of molecules with different properties, which makes them highly versatile and important in many different fields, such as medicine and engineering. Carbon is a non-metal, but can behave like a metal in certain circumstances. It is also the basis of the fossil fuels that power our society.

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Answer:

The molar mass of the gas is 99.4 g/mol

Explanation:

Ideal gas law PV=nRT. P=155.3 T=127+273= 400K V=25.0 Gas constant=8.314 Now substiture the values into the equation n=PV/RT

n= (155.5kPa x 25.0mL x 1l/1000mL)/ 8.312l*KPa/mol*K x 400K

n= 0.001167 mol

Molar mass= Mass/ Number of moles

                = 0.116g /0.001167 mol

                = 99.4 g/mol

Grams of aluminum that will be produced if 1.0 g of Ba react with 1.80 g of Al2(SO4)3 will be 0.28g Al. Hence option c) is correct.

A balanced equation is a chemical equation where mass is conserved and there are equal numbers of atoms of each elements on both the sides of equation.

Given, 1.80 g of Al2(SO4)3 and 1.0 g of Ba

So, (1.8 g)/(341.96 g) = 0.00526 moles of Al2(SO4)3

And, 1 mole = 341.96g Al2(SO4)3

Now, (0.00526 moles of Al2(SO4)3)*(2 moles of Al)

= 0.01052 moles of Al

So, (0.01052 moles of Al)*(27 grams of Al)

= 0.28g Al

Hence, option c is correct.

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Answer: See explanation

Explanation:

The pH scale is used to measures how acidic an object is. It should be noted that the objects that are basic aren't very acidic. The most acidic has values of 0 while the most basic has value of 14, 7 is known to be neutral.

Therefore, list of foods with pH from most basic to most acidic will be:

Green tea 9.0,

Alkaline water 8.0

Fruit juice 6.8

Vinegar 3.5,

Gatorade 3.0

Explanation:

ni suna ham naHow many of each type of atom should react so that the electrons

lost will equal the electrons gained?

molecule of the variables shift in the opposite directions when there is a inverse or negative relationship. In other words, the dependent variable grows if the value of the independent variable falls.

The dependent variable in this study are often the effect and the variable are the cause in a research investigation. Additionally, one could say that there is a cause-and- effect link between the independent and the dependent variables.

A statistical method known as correlation is used to quantify and explain a link between two variables. The two factors are often just observed, not changed. Two scores from identical people must be used for the correlation

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Answer:

Explanation:

Similarities.

Both Ionic and covalents bond produce exothermic reactions.

They are both neutral.in Ionic bonds, the two opposite charge will terminate each other and in covalent, the neutral molecules tend to share electrons.

Difference

Ionic bonds have high polarity while covalent have low.

Ionic bonds have no definite shape, covalent have.

Ionic have high melting points, covalent have low.

Io ic have high boiling point, covalents have low.

Answer:

a decrease in species A is correct answers