BRAINLIEST FOR THE FIRST CORRECT ANSWER!! im revising for a test and my teacher gave me some questions to do but i dont understand them. could you pls help me out

Answer:

We know that 18 g of H2O contains 1 mole (or 6.022 x 10^23) molecules of water because the molar mass of H2O is 18 g/mol.

So 1 g water will contain 1/18 moles of H2O molecules.

Now 15 g of water will contain 15/18 moles of H2O.

So molecules of H2O = (15/18) x 6.022 x 10^23 = 5 x 10^23 molecules.

Explanation:

I learned this in science hope this helps.

Explanation:

(1) they are heterogenous mixture

(2) the size of particles of colloids is too small to be seen by bare eyes.

(3) they scatter light passing through them making it's path visible.

Answer:

Explanation:

The Golgi apparatus receives proteins and lipids (fats) from the rough endoplasmic reticulum. It modifies some of them and sorts, concentrates and packs them into sealed droplets called vesicles.

The acceleration due to gravity on the massive planet is 39.48 m/s².

The period (T) of a simple pendulum is given by:

T = 2π√(L/g),

where L is the length of the pendulum and g is the acceleration due to gravity.

In this scenario, we are given that the period of the pendulum (T) is 1 second and the length of the pendulum (L) is 1 meter.

So, substituting these values into the equation:

1 = 2π√(1/g)

Simplifying this equation :

g = (4π²) / (1²)

g = 4π² m/s²

g ≈ 39.48 m/s²

Learn more about simple pendulum at: https://brainly.com/question/31309965

#SPJ1

Thepref Etruscans erred to build their temples using wood and mud brick, but they later adopted the use of stone as a building material. This shift from wood and mud brick to stone occurred as they became more prosperous.

The Etruscans were an ancient civilization in Italy that flourished between the 8th and 3rd centuries BCE. Their civilization was characterized by their use of metal, especially bronze, in making jewelry and other decorative items.

They built several impressive structures, including temples, tombs, and walls. Their temples were made using wood and mud brick as a primary building material. However, as they became more prosperous, they began to use stone as well. In some instances, the Etruscans used tufa and travertine stones to construct their temples. This is seen in the Temple of Portonaccio at Veii, which dates back to the early 5th century BCE.

The Etruscan's temples were notable for their decorative elements, which were inspired by the Greek temples. They featured sculptures, murals, and frescoes that depicted religious themes and figures. The walls of the temples were often adorned with terracotta tiles, which were painted with colorful scenes and designs.

In conclusion, the Etruscans preferred wood and mud brick as building materials for their temples but later adopted the use of stone as they became more prosperous.

learn more about Etruscans on

https://brainly.com/question/30431476

#SPJ11

Answer:

\(\large \boxed{\text{299.4 g}}\)

Explanation:

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:        44.10                          44.01

              C₃H₈   +   5O₂   ⟶   3CO₂   +   4H₂O

m/g:  100.00

To solve a stoichiometry problem, you must

1. Moles of C₃H₈

\(\text{Moles of C$_{3}$H}_{8} = \text{100.00 g C$_{3}$H}_{8} \times \dfrac{\text{1 mol C$_{3}$H}_{8}}{\text{44.10 g C$_{3}$H}_{8}} = \text{2.268 mol C$_{3}$H}_{8}\)

2. Moles of CO₂

The molar ratio is 3 mol CO₂:1 mol C₃H₈

\(\text{Moles of CO}_{2} = \text{2.268 mol C$_{3}$H}_{8} \times \dfrac{\text{3 mol CO}_{2}}{\text{1 mol C$_{3}$H}_{8}} = \text{6.803 mol CO}_{2}\)

3. Mass of CO₂

\(\text{Mass of CO}_{2} = \text{6.803 mol CO}_{2} \times \dfrac{\text{44.01 g CO}_{2}}{\text{1 mol CO}_{2}} = \textbf{299.4 g CO}_{2}\\\text{The mass of CO$_{2}$ required is $\large \boxed{\textbf{299.4 g}}$}\)

Answer:

Number of moles of propane:

=Mass in grams ÷ Relative molecular Mass

= 100/((12*3) + (1*8))

= 100 ÷ 44

= 2.2727

Mole ratio propane:carbon (IV) oxide = 1:3(from the equation)

Number of moles of CO2 = 3*2.2727 = 6.8181

Mass in grams = Relative molecular Mass * Number of moles

= 44 * 6.8181

= 299.9964 grams

Explanation:

Crystals impurities are expected to have high solubility in cold solvents. Hence, option C is correct.

Cold solvent cleaning is a process used to remove grease, wax and other impurities from metal and other parts.

The process is also called degreasing. Cold solvents are sprayed onto the dirty part and it is brushed clean.

Once the filtration process is done the collected crystals should be washed with a little more ice-cold solvent to remove final soluble impurities which would otherwise be left on the surface of the crystals.

Hence, option C is correct.

Learn more about the cold solvent here:

https://brainly.com/question/11445831

#SPJ1

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 10 g

volume = 2 cm³

We have

\(density = \frac{10}{5} \\ \)

We have the final answer as

Hope this helps you

Answer:

when the water heats up i believe

Explanation:

b

Answer:

O-H F-H N-Hy

Explanation:

C-H N-H O-H F-H

Answer:

\(\large \boxed{\text{3. Na}}\)

Explanation:

We can use oxidation numbers to decide which substance is reduced.  

\(\rm 2\stackrel{\hbox{0}}{\hbox{Na}} + 2\stackrel{\hbox{+1}}{\hbox{ H}_{2}}\stackrel{\hbox{-2}}{\hbox{O}}\longrightarrow \rm 2\stackrel{\hbox{+1}}{\hbox{Na}^{+}} + 2\stackrel{\hbox{-2}}{\hbox{O}}\stackrel{\hbox{+1}}{\hbox{H}^{-}} + \stackrel{\hbox{0}}{\hbox{H}_{2}}\)

The oxidation number of Na changes from 0 in Na to +1 in Na⁺.

The oxidation number of H changes from +1 in H₂O to 0 in H₂.

\(\text{An increase in oxidation number is oxidation, so $\large \boxed{\textbf{Na}}$ is the substance oxidized.}\)

1 and 4 are wrong because H₂ and Na⁺ are products.

2. is wrong because there is no H⁺ to be oxidized or reduced.

Answer

7.53% 97% if you divide it you can get the answer

Explanation:

When a can of coke is removed from the fridge and then warmed up to room temperature, the entropy of the beverage will increase.

We can define entropy as the disorderness of a system or the randomness of a particular system. The entropy of a system changes with a change in the temperature of the system.

As the temperature increases, the entropy of the system also increases and when the temperature is reduced, the entropy of the system also decreases. When a can of coke is kept in fridge, the entropy decreases as the temperature gets decreased.

As the can of the coke is taken out and warmed up to room temperature, the entropy increases with the increase in temperature as the randomness of the molecules increases.

To know more about entropy here

https://brainly.com/question/14131507

#SPJ4

The purpose of using cobalt glass was to filter out yellow light emitted by sodium, allowing the observer to see the violet flame color of potassium.

When a sample containing both sodium and potassium is heated in a flame, they emit different colors of light. However, both elements emit some yellow light, which can make it difficult to distinguish between them. Cobalt glass filters out the yellow light, allowing the observer to see the distinct violet color of potassium flame. This is because the cobalt glass absorbs the yellow light and transmits the rest of the visible spectrum. Using cobalt glass is a common technique in flame tests to improve the accuracy of identifying the elements present in a sample.

Learn more about purpose of using cobalt glass here:

https://brainly.com/question/14529236

#SPJ11

Answer:

Explanation:

Silver has a molar mass of 107.87 g⋅mol−1 . What does this mean? It means that if I have such a mass of silver, there are Avogadro's number, NA=6.022×1023 , individual silver atoms

The number of silver atoms in 1 mole of silver. Avogadro's constant is

defined as the number of units in one mole of a substance.

Avogadro's constant is denoted by the following below:

NA = 6.022×10²³ mol⁻¹.

In the question, we were asked for the number of silver atoms in 1 mole of a

substance which is equivalent to the Avogadro's constant.

This means the number of atoms in 1 mole of silver = 6.022×10²³ mol⁻¹.

Read more on https://brainly.com/question/15989275

The shelf-life of the reconstituted ampicillin suspension remains unchanged at 16 days when stored at room temperature (25°C) compared to storing it in the refrigerator at 5°C.

To calculate the shelf-life of the reconstituted ampicillin suspension at room temperature, we'll assume that the degradation follows an Arrhenius relationship.

Shelf-life at 5°C (T₁) = 16 days

Temperature at 5°C (T₁) = 5°C

Temperature at room temperature (T₂) = 25°C

To find the shelf-life at room temperature, we can use the Arrhenius equation:

k₁ / k₂ = exp((Ea / R) * (1/T₂ - 1/T₁))

Since we don't have specific values for Ea and the reaction rate constants, we'll assume that they are the same for simplicity. Thus, we can write:

k₁ / k₂ = exp((Ea / R) * (1/25 - 1/5))

Simplifying the equation, we get:

exp((Ea / R) * (4/125)) = 1

To satisfy this equation, the exponential term must be zero, which implies:

(Ea / R) * (4/125) = 0

Solving for Ea, we find:

Ea = 0

Since Ea is zero, it means the reaction rate constants and degradation rates are the same at both temperatures. Therefore, the shelf-life at room temperature (25°C) is the same as the shelf-life at 5°C, which is 16 days.

learn more about shelf-life here:

https://brainly.com/question/27891863

#SPJ4

Answer:

The answer to your question is given below

Explanation:

The balanced equation for the reaction is given below:

2KClO₃ —> 2KCl + 3O₂

From the balanced equation above,

2 moles of KClO₃ decomposed to produce 2 moles of KCl and 3 moles of O₂.

Next, we shall determine the number of mole of KClO₃ that will decompose to produce 9 moles of O₂. This can be obtained as follow:

From the balanced equation above,

2 moles of KClO₃ decomposed to produce 3 moles of O₂.

Therefore, Xmol of KClO₃ will decompose to produce 9 moles of O₂ i.e

Xmol of KClO₃ = (2 × 9)/3

Xmol of KClO₃ = 6 moles

Thus, 6 moles of KClO₃ is needed for the reaction.

Next, we shall determine the number of mole KCl that will be produced by the decomposition of 6 moles of KClO₃. This can be obtained as follow:

From the balanced equation above,

2 moles of KClO₃ decomposed to produce 2 moles of KCl.

Therefore, 6 moles of KClO₃ will also decompose to produce 6 moles of KCl.

Finally we shall represent the reaction in a chart as illustrated below:

2KClO₃ —> 2KCl + 3O₂

6 moles —> 6 moles | 9 moles

The total pressure of the gas mixture is 1.371 atm.

The total pressure of a gas mixture can be calculated using Dalton's Law of Partial Pressures. According to Dalton's Law, the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each individual gas in the mixture.
In this case, the gas mixture contains two gases: argon (Ar) and hydrogen (H2). We are given that the mole fraction of H2 is 0.350 and the pressure of H2 is 0.480 atm.
To find the total pressure of the mixture, we need to calculate the partial pressure of Ar. The mole fraction of Ar can be calculated as 1 minus the mole fraction of H2:
Mole fraction of Ar = 1 - Mole fraction of H2
Mole fraction of Ar = 1 - 0.350
Mole fraction of Ar = 0.650

Now, we can use the mole fractions to calculate the partial pressures of each gas:
Partial pressure of Ar = Mole fraction of Ar * Total pressure
Partial pressure of Ar = 0.650 * Total pressure
Partial pressure of H2 = Mole fraction of H2 * Total pressure
Partial pressure of H2 = 0.350 * Total pressure
According to the given information, the partial pressure of H2 is 0.480 atm. We can set up an equation using this information:
0.480 atm = 0.350 * Total pressure
To solve for the total pressure, we divide both sides of the equation by 0.350:
Total pressure = 0.480 atm / 0.350
Total pressure = 1.371 atm.

To know more about total pressure visit:

brainly.com/question/5462518

#SPJ11

The propagation step in the free radical chlorination of methane is:

∙CH₃ + Cl∙ → CH₃Cl

In the free radical chlorination of methane, the propagation step is a crucial part of the overall reaction mechanism. It involves the interaction between a methyl radical (∙CH₃) and a chlorine radical (Cl∙), resulting in the formation of chloromethane (CH₃Cl).

During the propagation step, the methyl radical (∙CH₃) and chlorine radical (Cl∙) combine to produce chloromethane (CH₃Cl). This reaction occurs through the abstraction of a hydrogen atom from methane by the chlorine radical, forming a new C-Cl bond and generating a new methyl radical. The overall reaction can be represented as follows:

∙CH₃ + Cl∙ → CH₃Cl

Learn more about chlorine and methane from the link given below.

https://brainly.com/question/2409985

#SPJ4

Giant molecules are also referred to as macromolecules and polymers when numerous molecules are combined. These atoms are arranged in a three-dimensional structure and are joined by covalent bonds.

A giant molecule, also known as a macromolecule, is a usually large molecule crucial to biophysical processes, such as a protein or nucleic acid. It is made up of many atoms that are covalently bound. Large non-polymeric molecules including lipids and macrocycles, as well as biopolymers, are the most prevalent macromolecules in biochemistry. In addition to synthetic fibers, giant molecules can also be found in research materials like carbon nanotubes.

Different experts use different terminology for giant molecules. For instance, in biology, giant molecules refer to the four immense molecules that make up living things, while in chemistry, it refers to aggregates of two or more molecules that are held together by intermolecular forces rather than covalent bonds yet that is difficult to dissolve apart. The term giant molecule is frequently referred to as high polymer in British English.

Learn more about giant molecule : https://brainly.com/question/13277913

Answer: Calcium (ca)

Explanation:

Step 1 - Finding the molar mass of glycine

The molar mass of glycine can be found by multiplying the molar mass of each element by the number of times it appears in the formula and then summing it all up.

For glycine, we find the molar mass of 75.07 g/mol.

Step 2 - Interpreting the meaning of molar mass

The molar mass gives us the total mass of one mole of that substance. Let's take water as an example: its molar mass is 18 g/mol, which means one mole of water would weight 18 g, two moles 36 g and so on.

For glycine, therefore, one mole weights 75.05 g.

Step 3 - Finding the number of moles

To find the number of moles, we can use a very simple formula relating mass (m), molar mass (M) and number of moles (n):

Therefore, there are 1.77*10^(-2) moles in 1.332 g of glycine.

The concept of energy balance refers to the equilibrium between the energy input into a system and the energy output from that system. It is based on the principle of conservation of energy, which states that energy cannot be created or destroyed but can only be transferred or transformed from one form to another.

In terms of human energy balance, it involves the energy intake from food and beverages (energy in) and the energy expenditure through basal metabolic rate, physical activity, and other bodily processes (energy out). When the energy intake matches the energy expenditure, there is an energy balance. However, when there is an imbalance, either an excess or deficit of energy, it can lead to weight gain or weight loss, respectively.

For example, if a person consumes 2000 calories (energy in) through their diet and expends 2000 calories (energy out) through their daily activities and bodily functions, they maintain an energy balance. This means that the energy intake is equal to the energy expenditure, and their weight remains stable.

On the other hand, if a person consumes 2500 calories (energy in) but only expends 2000 calories (energy out), there is a positive energy balance. The excess energy is stored in the body as fat, leading to weight gain over time.

Conversely, if a person consumes 1500 calories (energy in) but expends 2000 calories (energy out), there is a negative energy balance. The body needs to compensate for the energy deficit by utilizing stored energy reserves, such as fat, resulting in weight loss.

Support for the concept of energy balance comes from scientific studies on weight management and obesity. It has been shown that maintaining an energy balance is crucial for weight maintenance, while sustained positive or negative energy balances can lead to weight changes. Additionally, energy balance plays a role in various physiological processes, including metabolism, hormone regulation, and overall health.

By understanding and managing energy balance, individuals can make informed decisions regarding their diet, physical activity, and lifestyle to achieve and maintain a healthy weight and overall well-being.

To know more about energy balance, click here, https://brainly.com/question/31922451

#SPJ11

Answer: A the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds

Explanation: I just took the assessment and in my notebook molecular structure has a definition that is literally answer A. Also I got it right lol.

it is thinner, denser, younger, and of different chemical composition.

It's the solid rock we live on. It is either continental or oceanic. The Continental crust is typically thirty to fifty km thick while the oceanic crust is only five to ten km thick. The oceanic crust is densely subduable, and constantly being destroyed and replaced at plate boundaries.

Earth has three layers crust, mantle, and core. The crust is made up of solid rocks and minerals. Beneath the crust is the mantle, also mostly solid rocks and minerals, but broken by malleable regions of semi-solid magma. At the center of the Earth is a hot, dense metallic core. The Continental crust is typically forty km twenty-five miles thick while the oceanic crust is much thinner, averaging about six km four miles thick.

Learn more about Oceanic crust here:-https://brainly.com/question/26053779

#SPJ1

The maximum number of electrons that can occupy 2p orbitals is six.

In atomic theory, each orbital has a maximum capacity for two electrons, one with a spin-up (+1/2) and the other with a spin-down (-1/2). The 2p orbitals consist of three separate orbitals labeled as 2px, 2py, and 2pz. These orbitals are oriented along the x, y, and z axes, respectively.

Since there are three 2p orbitals, the total number of electrons that can occupy them is 2 electrons per orbital x 3 orbitals = 6 electrons. This means that each of the 2p orbitals can accommodate a maximum of two electrons.

The 2p orbitals are higher in energy than the 2s orbital, and they are typically filled after the 2s orbital in the electron configuration of atoms. Understanding the maximum electron capacity of orbitals is important for determining the electronic structure and chemical behavior of elements.

To learn more about electrons  click here

brainly.com/question/12001116

#SPJ11

Given,

The dilution equation is:

(cc)(vc) = (cd)(vd),

where cc is the initial concentration, vc is the initial volume, cd is the final concentration, and vd is the final volume. To calculate the volume of 1.0 M sucrose needed to prepare 2.0 L of 0.1 M sucrose, we can use this equation as follows:

cc = 1.0 Mcd = 0.1 Mvd = 2.0 L

Substituting these values into the dilution equation, we get:

(1.0 M)(vc) = (0.1 M)(2.0 L)

Solving for vc, we get:

vc = (0.1 M)(2.0 L) / (1.0 M)vc = 0.2 L

Therefore, the volume of 1.0 M sucrose needed to prepare 2.0 L of 0.1 M sucrose is 0.2 L.

The correct option is b) 0.2 L.

#SPJ11

Learn more about dilution equation:

https://brainly.com/question/29744450

The complete empirical formula of the organic compound is C₅H₂.

Empirical formula is the simplest formula of an organic compound. The balanced chemical equation of the given organic compound can be determined using the general formula for balancing oxidation reaction of organic compounds as shown below.

\(C_xH_y + (x+ \frac{y}{4} )O_2 = xCO_2 \ + \ \frac{y}{2} H_2O\)

Molecular mass of CO2 = 44 g/mol

mole = reacting mass /molecular mass

mole = 4.4/44 = 0.1

mole = 0.72/18 = 0.04

From the empirical formula, we have \([?]_5H_{[?]} = C_5H_{[?]}\)

\(0.1 \times n = 5\\\\ n = \frac{5}{0.1} = 50\)

From the result above, if we multiply 0.1 by 50 we will have 5 which is already given to us as C₅.

\(x = 0.1 \times 50\\\\x = 5\)

Then multiply 0.04 for y by the same factor.

\(y = 0.04 \times 50\\\\y = 2\)

Thus, the complete empirical formula of the organic compound is C₅H₂.

Learn more about empirical formula here: https://brainly.com/question/1603500

Answer:

it's volume also decrease