Really need help with the rest of them, please it's due in 20 minutes

Answer:

3.62 g/cm³

Explanation:

density = mass ÷ volume

Therefore, do 12.69 divided by 3.5

Answer:

There are 15 protons in phosphorous.

~Hoped this helped~

~Brainiliest?~

Answer:

electrolytes

Explanation:

If an electrical current can run though a solution, it is said to contain  ions and the solution in which ions are present is called as electrolytes.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.

Learn more about ions,here:

https://brainly.com/question/1488567

#SPJ2

Number of moles

Explanation:

From the general formula of ideal gas equation it is seen that number of moles is present and absent in other gas equations

Answer: 1 molar NaOH contains 40 grams of NaOH per every liter of water

Explanation:

so 2 M NaOH contains twice that amount, ie. 80 grams per liter. Then, ine 250 ml of weater, there should be 80/4 = 20 grams of solid NaOH dissolved.

Answer:

it's not clear

Explanation:

.

Explanation:

pressure is Force/area

30000/0.75

Answer:

0.00032 M

Explanation:

From the question,

Applying the for pH

pH = -log[H⁺]............... Equation 1

Where H⁺ = Hydrogen ion concentration of Hydrochloric acid

Given: pH = 3.50

Substitute into equation 1 and solve for H⁺

3.50 = -log[H⁺]

Taking the log inverse of both side,

H⁺ = 10⁻⁽³⁵/¹⁰⁾

H⁺ = 0.00032 M

Hence the H⁺ of Hydrochloric acid is  0.00032 M

Answer:

176 g/mol

Explanation:

To get this, multiply the weight of the molecule by Avogadro's number:

(2.93×[tex]10^{-22}[/tex]) × (6.022×[tex]10^{23}[/tex]) = 176.44 g/mol

Answer: Organic acids form when a carboxyl group (−COOH) is substituted for one of the hydrogen atoms in a hydrocarbon.

Answer:

Answered below

Explanation:

>> ice is solid

>> water is liquid

>> Steam is gas

>> Ice → water = melting

>> water → steam = evaporation

>> steam → water = condensation

>> water → ice = freezing

Answer:

Explanation:

Fungicides are agents that are used to prevent or eradicate fungal infections from plants or seeds.

Answer:

Fungus on the crops can be controlled by using:-

Start by planting healthy stock.  

Choose planting sites based on plant needs.  

Avoid overhead watering.  

Water early in the day.  

Don't crowd plants.  

Don't work a wet garden.  

Treat with a trusted, proven fungicide.

Explanation:

hope it helps!

:)

Answer:

There are 1.393 x 10²⁴ atoms in 25.00 g of B.

Explanation:

Hey there!

We are given a value, in grams, that we need to convert to a number of atoms.

We can convert grams to atoms by using Avogadro's Number ([tex]N_A[/tex]). This number is equivalent to [tex]6.022 \times 10^{23}[/tex].

This number can be used to convert any values to:

In order to do this problem, we will need to use dimensional analysis (DA). This process allows us to convert from grams to atoms.

We need to set up our ratios in order to work this out. We can use a periodic table to help us through this next part of the problem.

1. Locating the number of moles of B in the sample

We first need to find the amount of moles of boron (B) there are in the sample.

Checking a periodic table, the atomic mass in atomic mass units (amu) is 10.81 amu.

Therefore, for each atom of boron, it weighs 10.81 grams to us. This is equivalent to the mass of one mole of boron.

To find the number of moles, we have two possible ratios we can use:

These ratios mean the same thing, but we need to convert our final unit to moles.

We are given a sample in grams, and when dividing our units, we need to keep moles.

Since the first portion of our expression is in grams, we need to have grams in the bottom of our expression.

We can now simplify the expression. Our grams B unit will cancel out, so we are therefore left with moles B remaining.

2. Locating the number of atoms in the sample

Now with our equation, we can convert our number of moles that would be solved if we stopped with the above. However, we need to convert to atoms.

We use Avogadro's number and create a ratio with that of moles.

We need to cancel out our moles and end with atoms, so we must have moles in the denominator. Therefore, we use the first ratio.

Using our previous expression, we multiply by this new ratio and solve the expression.

This expression can now be operated. You will need a calculator to perform this calculation.

Our numerator is:

Plugging this into a calculator, we get:

Our denominator is:

This simplifies to:

Dividing our numerator and denominator:

Plugging this into a calculator, we get:

3. Simplifying with significant figures

Now, we need to take into account that we have significant figures. We are given this original value:

This value has four significant figures, which means we need to round our value we received above to four significant figures.

Our units are added as well as our scientific notation:

Therefore, our final answer is choice A.

Answer:

b)6.2 grams

Explanation:

Recall that percentage yield =

actual yield/theoretical yield * 100/1

theoretical yield = 8.2 grams

percentage yield = 75%

Let the actual yield be x

Hence;

75 = x/8.2 * 100

75 = 100x/8.2

75 * 8.2 = 100x

x = 75 * 8.2/100

x = 6.15 g

x = 6.2 g

75 =

Answer:

2.56 moles of nitrogen was released.

Explanation:

We'll begin by calculating the final moles of nitrogen in the canister. This can be obtained as follow:

Initial mole (n₁) = 3.2 moles

Initial volume (V₁) = 1.5 L

Final volume (V₂) = 0.3 L

Final mole (n₂) =?

V₁/n₁ = V₂/n₂

1.5 / 3.2 = 0.3 / n₂

Cross multiply

1.5 × n₂ = 3.2 × 0.3

1.5 × n₂ = 0.96

Divide both side by 1.5

n₂ = 0.96 / 1.5

n₂ = 0.64 mole

Finally, we shall determine the number of mole of nitrogen that was released. This can be obtained as follow:

Initial mole (n₁) = 3.2 moles

Final mole (n₂) = 0.64 mole

Amount released =?

Amount released = n₁ – n₂

Amount released = 3.2 – 0.64

Amount released = 2.56 moles

Thus, 2.56 moles of nitrogen were released.

Answer: Heat Q = m·c·ΔT

Explanation: Mass of 1.00 mol water m= 18.016 g. Heat capacity of water is

c= 4.19 J/( g K) and change of temperature ΔT= 100 K

Answer:

1.Exhaust from farming machines pollutes the air

2.Cows give off methane gas that gets into the atmosphere

3.The land the farm was cleared away on effects other recosystems

Explanation:

Farming adversely affected the earth systems such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.

Agriculture causes a number larger of environmental issues that cause environmental degradation such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.

For example, exhaust from farming machines pollutes the air, Cows give off methane gas that gets into the atmosphere and the land the farm was cleared away on effects other ecosystems.

So we can conclude that farming adversely affected the earth systems such as climate change, deforestation, biodiversity loss, irrigation problems, pollutants, soil degradation, and waste production.

Learn more about farming here: https://brainly.com/question/17392167#

Answer:

the ice becomes -20 degrees celcius colder

Explanation:

Answer: All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.

Explanation: please mark as brainliest

In the case when the HCI should be added so it should be shifted to reactants.

It is the solution that should be considered as the aqueous solution that comprise of the mixture of the weak acid and the conjugate base.

Here the ph level should be change very less at the time when the small amount of the strong acid should be added.

Therefore, it  should be shifted to reactants.

Learn more about solution here: https://brainly.com/question/20856989

Answer:

No. Light is not a physical thing, so it cannot change physical things like glue.

Explanation:

Light is not effective at all to glue, it doesn't do anything at all.

Answer: The new pressure is 66.66 mL.

Explanation:

Given : [tex]V_{1}[/tex] = 10 mL,        [tex]V_{2}[/tex] = 3 mL

[tex]P_{1}[/tex] = 20 atm,          [tex]P_{2} = ?[/tex]

Formula used to calculate the new pressure is as follows.

[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]

Substitute the given values into above formula as follows.

[tex]P_{1}V_{1} = P_{2}V_{2}\\20 atm \times 10 mL = P_{2} \times 3 mL\\P_{2} = \frac{20 atm \times 10 mL}{3 mL}\\= 66.66 mL[/tex]

Thus, we can conclude that the new pressure is 66.66 mL.

Answer:

3.02 X1023 atoms Ag limol. - - 0.50 1 moles. 6.02241023 atoms.

Answer:

A

Explanation:

The letter A is the correct answer

Answer:

B. 20m/s

Explanation:

The wavelength of a wave can be calculated using the formula;

λ = v/f

Where;

λ = wavelength (m)

v = velocity (m/s)

f = frequency (Hz)

According to the information provided in this question; the wave has a wavelength (λ) of 2m and a frequency (f) of 10Hz.

Using λ = v/f

v = λ × f

v = 2 × 10

v = 20m/s.

Explanation:

taiga the largest land well forest