need help with question please ..
-20 points

Answer:

Less than 7 ph value are acidic. Greater than 7 ph value are basic.

Answer:

empirical formula

Answer: To answer your question of what is true of a lewis base, it is true that a lewis base donates electron pairs.

Explanation: A Lewis base is any substance, such as the OH- ion, that can donate a pair of nonbonding electrons. A Lewis base is therefore an electron-pair donor.

Answer:

Natural causes are unintentional.

Explanation:

An example would be a wildfire. This natural disaster spreads quickly, especially in forests where wood burns easily. Destroying forests through burning causes nutrients to get depleted, and organisms die.

Answer:

Explanation:

Explanation:

Gold Au

Copper Cu

Iron Fe

Magnesium Mg

Hydrogen H

Helium He

Mercury Hg

Iodine I

Answer:

They all have a choloride(CI-1) ion

Explanation:

Answer: The statement that correctly describes a physical change is may involve a change in phase but does not involve a change in the molecular structure. The answer is letter B.

Explanation: trust me

Explanation:

OA- because there is breakdown of chemical bonds

Answer:

see below

Explanation:

The lake will have more total thermal energy but the particles in the coffee will be moving faster.

A comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

The principle of conservation of energy states that the total energy of an isolated system is always conserved.

Heat lost by the hot coffee = Heat absorbed by the cold lake

Heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

Thus, a comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

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Total mass of carbon must be decreasing in different step of carbon cycle because matter is conserved in the processes and reactions of carbon cycle. Carbon is a matter and it is the major constituent of living organisms.

Carbon cycle refers to processes where carbon move from the atmosphere to the biosphere and Earth and then back to the atmosphere.

It involves processes of using and reusing carbon again and again and it's conservation.

Carbon is an organic matter found in living organisms and total mass of carbon reduces because it is a matter that is conserved.

Carbon is released from that atmosphere, use for photosynthesis, plants and animals consume the plants. They defecate , respirate and carbondioxide is released during respiration.

Therefore,Total mass of carbon must be decreasing in different step of carbon cycle because because matter is conserved in the processes and reactions of carbon cycle. Carbon is a matter and it is the major constituent of living organisms.

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Answer:  no

Explanation:

Atoms are not and have never been alive so they can't be considered dead. they simply do not meet any reasonable of life, primarily because they are not complex.

Answer:

1.

a. Diagram A

b. Diagram A should stay still, but Diagram B should move/roll to the left.

__________________________________

2.

a. Diagram A and Diagram B are different because the object kg are different, one is 10kg and the other is 2kg.

b. Diagram B because its smaller making it lighter to move when Diagram A is 5 times larger, which will make it heavier.

__________________________________

3.

a. Diagram A and Diagram B compare because the object both equal 3kg.

b. Diagram A will have a greater acceleration because 80n > 40n

Answer:

1. Na2SO4(aq)+C4H6BaO4(aq) --> BaSO4(s) + 2C2H3NaO2(aq)

2. 2Na^+1(aq) + SO4^-2(aq) + 4C^+4(aq) + 6H^+1(aq) + Ba^-2(aq) + 4O^-2(aq) --> BaSO4(s) + 2C^-4(aq) + 2H^+1(aq) + 3Na^+1(aq) + 2O^-2(aq)

3. Ba^+2(aq) + SO4^-2(aq) --> BaSO4(s)

Explanation:

Answer:

A- Butyric acid and methylammonium chloride.

Explanation:

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Explanation:

Crude is classified, based on density, as light, medium, heavy, or extra heavy. It can also be classified, based on sulfur content, into a sour and sweet category.

Answer:

c

Explanation:

Law of Conservation of Matter for the formation of sodium chloride, in simplest form would be obeyed when 2 moles of sodium react with 1 ,mole of chlorine to form 2 moles of sodium chloride.

According to law of conservation of matter, it is evident that matter is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of matter and energy are related as matter has mass and mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of matter is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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The number of moles of KMnO4 is  0.0006 moles.

The equation of the reaction is;

6 H^+(аq) + 2 МnO4^- (аq) + 5 Н2С2O4(аq) → 10 CO2 (g) + 8 H20 (l) + 2 Mn²+ (aq)

We can see that the volume of the titrant used = Final - initial burette reading

= 29.6 mL - 3.4 mL = 26.2 mL

Number of moles of H2C2O4 =  0.139 g/90 g/mol = 0.0015 moles

If 2 moles of  MnO4- reacts with 5 moles of H2C2O4

x moles of  MnO4- reacts with 0.0015 moles of H2C2O4

x =  2 moles ×  0.0015 moles / 5 moles

x = 0.0006 moles

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The wavelength of the electromagnetic wave at the given frequency is 3.07 meters.

Given the following data:

To determine the wavelength of the electromagnetic wave at the given frequency:

Mathematically, the wavelength of an electromagnetic wave is calculated by using the formula;

[tex]Wavelength = \frac{Speed }{frequency}[/tex]

Substituting the given parameters into the formula, we have;

[tex]Wavelength = \frac{3 \times 10^8}{97.6\times 10^{6}}[/tex]

Wavelength = 3.07 meters.

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Answer:

3 x 10^8

Explanation:

Answer:

residential and domestic sources.

Explanation:

Answer:

The adaptive organ of duck is webbed feet.

Explanation:

Duck's webbed feet are designed like paddles to provide more surface area to help them swim.

the webbed feet

Explanation:

Answer:

Determine the frequency of light with a wavelength of 2.775⋅10−7 cm. Answer in units of Hz?❤

The percentage by mass of the acetic acid is 0.057%.

The given parameters:

The concentration of the acetic acid is calculated as follows;

[tex]C_1V_1 = C_2 V_2\\\\C_1 = \frac{ C_2 V_2}{V_1} \\\\C_1 = \frac{0.01 \times 250}{10} \\\\C_1 = 0.25 \ M[/tex]

The number of moles of acetic acid in the given concentration;

[tex]C = \frac{mol}{L} \\\\mole = CL\\\\mole = 0.25 \times 10 \times 10^{-3} \\\\mole = 0.0025[/tex]

The molar mass of acetic acid = 60 g/mol

The mass of acetic acid in the given number of moles is calculated as follows;

m = conc. x molar mass

m = 0.0025 x 60

m = 0.15 g

The mass of vinegar in the volume and density;

m = density x volume

m = 1.05 x 250

m = 262.5 g

The percentage by mass of the acetic acid is calculated as follows;

[tex]= \frac{0.15}{262.5} \times 100\%\\\\= 0.057 \%[/tex]

Thus, the percentage by mass of the acetic acid is 0.057%.

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Answer:

Personally, I use Superglue

Explanation:

Answer:

elements tend not to react with other elements, there were no oxide compounds for Mendeleev to study. –Group 18 elements are generally unreactive. sodium ion is smaller because the sodium atom lost one electron. –An Na+ ion is smaller because it has one fewer electron shell.

Explanation:

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Answer:electrical forces between the protons

Explanation: The strong nuclear force pulls together protons and neutrons in the nucleus. At very small distances only, such as those inside the nucleus, this strong force overcomes the electromagnetic force, and prevents the electrical repulsion of protons from blowing the nucleus apart.

There are 8.16 × 10-³ moles of CO2 gas at 100°C with a volume of 250 mL at 760 mm Hg.

HOW TO CALCULATE NUMBER OF MOLES:

The number of moles of a sample of gas can be calculated using the following formula:

PV = nRT

Where;

According to this question;

1 × 0.250 = n × 0.0821 × 373

0.250 = 30.62n

n = 0.250 ÷ 30.62

n = 8.16 × 10-³mol

Therefore, there are 8.16 × 10-³ moles of CO2 gas at 100°C with a volume of 250 mL at 760 mm Hg.

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