I need help ASAP k12 7th grade TGA 2.12

Answer:

1.00 M

Explanation:

Step 1: Write the balanced equation

HBr + LiOH ⇒ LiBr + H₂O

Step 2: Calculate the reacting moles of lithium hydroxide

40.00 mL of 0.500 M solution react. The reacting moles of LiOH are:

\(40.00 \times 10^{-3} L \times \frac{0.500mol}{L} = 0.0200 mol\)

Step 3: Calculate the reacting moles of hydrobromic acid

The molar ratio of HBr to LiOH is 1:1. The reacting moles of hydrobromic acid are 1/1 × 0.0200 mol = 0.0200 mol.

Step 4: Calculate the molarity of hydrobromic acid

0.0200 moles of HBr are in 20.00 mL of the solution. The molarity of the hydrobromic acid solution is:

\(M= \frac{0.0200 mol}{20.00 \times 10^{-3} L } =1.00 M\)

Answer:

you can use math wa, it helps

Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.

The electronic configuration [Ar]4s13d5 corresponds to the element Manganese (Mn) in its ground state.

To determine the number of unpaired electrons, we need to first fill the 4s and 3d orbitals according to the Aufbau principle and Hund's rule. The 4s orbital can hold up to 2 electrons, and the 3d orbital can hold up to 10 electrons. In the case of Mn, the [Ar] noble gas configuration represents the completely filled inner shells, so we start by adding 4s1 electron and then 5 more electrons to the 3d orbital. We have:

1s2 2s2 2p6 3s2 3p6 4s1 3d5

We can see that there are five unpaired electrons in the 3d orbital (in the d-subshell, there are five unpaired electrons in the five available d-orbitals), which makes manganese a transition metal. Therefore, the number of unpaired electrons in the ground state of manganese is 5.

So, the answer is: Mn, 5.

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Approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

The relationship between the initial and final concentrations and volumes must be taken into account.

Given: Initial concentration \((C^1) = 1 M Initial volume (V^1) = 250 mL\)

\((C^2) = 3 M final concentration\)

We can use the equation:

\(C^1 * V^1 = C^2 * V^2\)

Where:

\(V^2\)is the final volume of the solution

Rearranging the equation to solve for V2:

\(V^2 = (C^1 * V^1) / C^2\)

Substituting the given values:

\(V^2 = (1 M * 250 mL) / 3 M\)

\(V^2 = 250 mL / 3\)

\(V^2\) ≈ \(83.33 mL\)

To find the amount of water that needs to be evaporated, we subtract the final volume from the initial volume:

Amount of water to be evaporated = \(V^1 - V^2\)

Amount of water to be evaporated = 250 mL - 83.33 mL

Amount of water to be evaporated ≈ 166.67 mL

Therefore, approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

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The following statements are TRUE, FALSE, TRUE and TRUE.

According to the postulates of the Kinetic Molecular Theory of Gases, gas particles travel in straight lines unless they collide with other particles or the walls of the container. Molecular collisions are perfectly elastic, meaning kinetic energy is conserved.

Gas particles also experience negligible intermolecular forces, as there are no significant attractive or repulsive forces between them. Regarding the volume-pressure relationship at constant temperature, based on Robert Boyle's experiment, the relationship is indeed inversely proportional. When an inflated balloon is placed inside a vacuum chamber, it will shrink, demonstrating Boyle's law.

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Answer:

7 (neutral).

Explanation:

Hello,

In this case, for the chemical reaction:

\(HCl+NaOH\rightarrow NaCl+H_2O\)

We can notice that since hydrochloric acid and sodium hydroxide are strong, they will fully dissociate during the titration, therefore, as they are in stoichiometric proportions in equal concentrations for the equivalence point, the pH will be 7 (neutral) since all the chloride ions are neutralized by the sodium ions.

Moreover, for the given acid solution, the required volume of sodium hydroxide will be:

\(V_{NaOH}=\frac{25.0mL*0.150M}{0.150M}=25.0mL\)

To attain a complete titration until the equivalence point.

Best regards.

750 x 14,0067 u = 10,505.025 g

Answer:

True if by rifting you mean continental rift. If not idk.

Answer:

\(m_{CaCO_3}=0.179gCaCO_3\)

Explanation:

Hello,

In this case, since the undergoing chemical reaction is:

\(CaCO_3(s)\rightarrow CaO(s)+CO_2(g)\)

The corresponding moles of carbon dioxide occupying 40.0 mL (0.0400 L) are computed by using the ideal gas equation at 273.15 K and 1.00 atm (STP) as follows:

\(PV=nRT\\\\n=\frac{PV}{RT}=\frac{1.00 atm*0.0400L}{0.082\frac{atm*L}{mol*K}*273.15 K})=1.79x10^{-3} mol CO_2\)

Then, since the mole ratio between carbon dioxide and calcium carbonate is 1:1 and the molar mass of the reactant is 100 g/mol, the mass that yields such volume turns out:

\(m_{CaCO_3}=1.79x10^{-3}molCO_2*\frac{1molCaCO_3}{1molCO_2} *\frac{100g CaCO_3}{1molCaCO_3}\\ \\m_{CaCO_3}=0.179gCaCO_3\)

Regards.

The mass of CaCO₃ required to produce 40.0 mL of CO₂ at STP is 0.179 g

From the question,

We are to determine the mass of CaCO₃ required to produce 40.0 mL of CO₂ at STP.

First, we will determine the number of mole of CO₂ required to be produced

From the formula

PV = nRT

Where

P is the pressure

V is the volume

n is the number of moles

R is the ideal gas constant

and T is the temperature

Then, we can write that

\(n = \frac{PV}{RT}\)

From the question,

V = 40.0 mL = 0.04 L

At STP

P = 1 atm

T = 273.15 K

and

R = 0.08206 L atm mol⁻¹ K⁻¹

Putting the parameters into the formula, we get

\(n = \frac{1 \times 0.04}{0.08206 \times 273.15}\)

∴ n = 0.0017845 mole

Now, we will write the balanced chemical equation for the decomposition of CaCO₃

CaCO₃ → CaO + CO₂

This means,

1 mole of CaCO₃ will decompose to produce 1 mole of CO₂

Since 0.0017845 mole of CO₂ is to be produced,

Then,

0.0017845 mole of CaCO₃ would be required

Now, for the mass of CaCO₃ required,

Using the formula

Mass = Number of moles × Molar mass

Molar mass of CaCO₃ = 100.0869 g/mol

∴ Mass of CaCO₃ required = 0.0017845 × 100.0869

Mass of CaCO₃ required = 0.178605 g

Mass of CaCO₃ required ≅ 0.179 g

Hence, the mass of CaCO₃ required to produce 40.0 mL of CO₂ at STP is 0.179 g

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Answer:

Potential energy. Kinetic energy can be stored. ... If we drop the object from the shelf or release the spring, that potential energy is converted back into kinetic energy. Kinetic energy can also be transferred from one body to another in a collision, which can be elastic or inelastic.

The percent yield of a chemical response is the proportion of the real yield to the hypothetical yield, communicated as a rate.

In this case, the hypothetical yield is 150 grams of sodium hydroxide, as calculated by the researcher. The genuine yield is 135 grams of sodium hydroxide, as gotten from the experiment.

The percent yield can be calculated utilizing the equation:

Percent yield = (real yield / hypothetical yield) x 100%

Substituting the values given within the issue, we get:

Percent  yield= (135 / 150) x 100%

Percent yield = 0.9 x 100%

Percent yield = 90%

Hence, the percent yield of the experiment is 90%. This implies that 90% of the hypothetical abdicate was gotten within the test.

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Animals can get chemical energy from both plants and other animals. They get this by consuming them.

Answer:from plants and animals

Explanation:

The molecular formula : Al₂Cl₆

Given

20.2% by mass of Aluminum and 79.8% by mass of Chlorine.

Required

the molecular formula

Solution

Aluminium (Ar=27 g/mol)

\(\tt \dfrac{20.2}{27}=0.748\)

Chlorine(Ar=35.5 g/mol)

\(\tt \dfrac{79.8}{35.5}=2.248\)

mol ratio Al : Cl =

\(\tt \dfrac{0.748}{0.748}\div \dfrac{2.248}{0.748}=1\div 3\)

So the empirical formula = AlCl₃

(Empirical formula)n=Molecular formula

(27+3.35.5)n=267

(133.5)n=267⇒n=2

The molecular formula : Al₂Cl₆

2.26 × 10²⁴ atoms Zn

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

3.75 mol Zn (Zinc)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

2.25825 × 10²⁴ atoms Zn ≈ 2.26 × 10²⁴ atoms Zn

Taking into account the definition of solvent and solute, you obtain that:

The solution is a homogeneous mixture of two or more components that have the same chemical and physical properties in a single phase. A solution is made up of two main components: the solute and the solvent.

That is, the solute and the solvent are the components of a chemical solution, that is, of a homogeneous mixture that occurs when one or more substances are dissolved in another substance.

The solute is the substance that dissolves in a solution. In solution, the solute is usually found in a lower proportion than the solvent.

Solvent, also known as solvent, is the substance in which a solute dissolves, resulting in a chemical solution. Generally, the solvent is the component that is found in the highest proportion in the solution. It will always be the solvent who will determine the state of the matter that will have the solution.

In this case,  you consider that the solute is the component in less quantity and the solvent is the major component, and you know that:

a. A solution containing 30.0 g KBr and 100.0 g of water. Then, KBr is the solute and water is the solvent.

b. A solution containing 80.0 mL of methanol and 45.0 mL of water. Then, water is the solute and methanol is the solvent.

c. A solution containing 0.5 g AgNO₃ and 15 mL of water.  Being the density of water 1 g/mL, then 15 mL contains 15 g of water. Then, AgNO₃ is the solute and water is the solvent.

Learn more:

Answer:

copper metal is a product of the cell reaction.

Explanation:

In writing the line notation of a cell reaction, we ought to recall that the anode is placed at the left hand side of the notation while the cathode is placed at the right hand side of the notation.

If we look at the line notation shown in the question, we will realize that the Cu2+ (aq) | Cu(s) half cell is the cathode and that copper metal is the product of the reaction as shown by the notation.

The y axis is concentration since  the amounts of reactants and products remain constant after equilibrium is reached.

In a chemical reaction system, equilibrium is said to be attained when the rate of forward reaction and the rate of reverse reaction are equal. This is indicated by the straight line.

Therefore, the correct label for the y axis is concentration, because the amounts of reactants and products remain constant after equilibrium is reached.

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What best explains the label that the student should use on the y-axis?

D. Concentration as the concentrations of reactants and products remain constant after equilibrium is reached

Answer: The answer is "What are the effect of low pH in soil"  

Explanation: This is because this can be tested and because it is not a opinion or a moral value. Thus this question can be tested with the scientific method.

The question that can be answered by science is "What are the effects of low pH in soil". Thus, the correct option for this question is D.

Science may be defined as a branch of scientific study that involves the application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence.

It can broadly be classified into three categories such as Physics, Chemistry, and biology. Each sub-classification illustrates its own field of detailed study.

Science always deals with the concept of nature as well as natural phenomena. So, among the given options, the soil is an abiotic component of nature.

The effects of low pH in the soil depend on various factors like the complexity of organisms living on a particular area, resources, pollution level, etc.

Therefore, the question that can be answered by science is "What are the effects of low pH in soil". Thus, the correct option for this question is D.

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Answer:

i feel like the answer is A

Answer:

True

Explanation:

When ice is heated, the ice gains heat.

This heat gained by the ice is both used to break the intermolecular forces in ice to form water, as well as to raise the temperature of the water to it's final temperature.

Answer:

Tetrahedral

Trigonal pyramidal

less than 109.5°

Explanation:

If a molecule has a hybridization of sp3 it must have four electron domains which corresponds to a tetrahedral geometry.

Now we were told that the molecule also has one lone pair. It means that one out of the four electron domains is composed of a lone pair. Thus the molecular geometry will be trigonal pyramidal (e.g NH3).

Recall that lone pairs usually decrease the bond angle to a value less than the expected value for that particular electron domain geometry.

The expected bond angle for a tetrahedral geometry is 109.5° but that of the trigonal planar geometry is less than this.

Answer:

1. Democritus- Matter was made of

different kinds of things.

2. Bernoulli- Gases are formed from tiny particles so small you can't see them. The particles are spread out into a certain area and move when people walk through them.

3. Priestley- Substances combine or

break apart to create new different substances.

Explanation:

1. Democritus was a Greek philosopher regarded to be the "Father of Science". He discovered that all matter were composed of indestructible things he called ATOMOS. Hence, his idea was that Matter was made of different kinds of things (atoms).

2. David Bernoulli, a mathematician, was born in 1700. He contributed immensely to the kinetic molecular theory of gases. In his postulated theory, he gave the idea that gases are formed from tiny particles so small you can't see them. The particles are spread out into a certain area and move when people walk through them.

3. Priestley- Joseph Priestley, born in 1733, is widely known for his discovery of oxygen gas among other gases. His idea was that substances combine or

break apart to create new different substances.

There are 2.16 × 10²⁵ molecules in 35.8 moles of CH₄.

The number of molecules in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number.

According to this question, there are 35.8 moles of methane. The number of molecules can be calculated as follows:

no of molecules = 35.8 × 6.02 × 10²³

no of molecules = 215.516 × 10²³

no of molecules = 2.16 × 10²⁵ molecules

This means that there are 2.16 × 10²⁵ molecules in 35.8 moles of methane.

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