TRUE/FALSE. State whether each of the following statements is true or false. Justify your answer in each case. (a) NH3 contains no OH- ions, and yet its aqueous solutions are basic

Answer and explanation

The solvent in the graph is water (H2O), water tells us that these substances dissolve at different amount of water, and the dissolvation is different in different temperatures in water. For example, NaCl readily dissolves in water.

mercury is not a mixture it is a element

Answer:

mercury

Explanation:

the answer is cf that the answer

Answer:

is B

Explanation:

it isnt C or D so let's look at A and B so the answer is more likely going to be B because A your muscles cant change shape and C your muscles are protien and D humans and animals do not have cell walls that only have cell membrane

Answer:

No B. is incorrect, the REAL answer is actually C.

Explanation:

The main function of muscles is to move body parts by contracting, which requires a lot of energy. so C. is the only answer that concludes with this. The cell structure that produces energy is the mitochondrion.

Therefore, the best prediction is that muscle cells contain a large number of mitochondria in order to provide more energy.

So that means B. would be an assumable answer.

I hope this helps!

Answer:

Independent variable: AMOUNT OF SUNLIGHT

Dependent variable: HEIGHT OF PLANTS

Experimental group: PLANTS KEPT UNDER BRIGHT SUN LAMPS ALL NIGHT

Control group: PLANTS THAT RECEIVED NORMAL AMOUNT OF SUNLIGHT

Explanation:

Independent variable refers to the variable that is manipulated or changed in an experiment in order to effect a measurable response. In this case, the independent variable is the VARYING AMOUNT OF SUNLIGHT.

Dependent variable is the variable that the experimenter measures or the variable that responds to changes made to independent variable. The dependent variable in this case is the HEIGHT OF PLANTS measured.

Experimental group is the group in an experiment that receives the experimental treatment. In this case, the PLANTS KEPT UNDER BRIGHT SUN LAMPS ALL NIGHT is the experimental group.

Control group is the group that does not receive any experimental treatment/independent variable. In this case, the PLANTS THAT RECEIVED NORMAL AMOUNT OF SUNLIGHT is the control group.

Answer:

608 L

Explanation:

Using Boyle's law equation as follows:

P1V1 = P2V2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (L)

V2 = final volume (L)

According to the information provided in this question;

P1 = 1.00atm

P2 = 2.8atm

V1 = ?

V2 = 217L

Using P1V1 = P2V2

V1 = P2V2/P1

V1 = 2.8 × 217/1

V1 = 607.6/1

V1 = 607.6

The initial volume is 608 L

Any time a charged particle, like an electron, modifies its velocity, electromagnetic radiation is created that is every time it accelerates or slows down. The charged particle loses the energy of the electromagnetic radiation that is subsequently created as a result.When an atom absorbs energy, it emits electromagnetic radiation.

One or more electrons in the atom move to a different location as a result of the energy being absorbed. An electromagnetic wave is created when the electron reposition itself.Atoms may absorb energy in a variety of ways. Electrical energy can be used as one method of atom excitation. Neon signs display this for you. The neon atoms will become excited or gain energy when we run electricity through the neon tubes.

In this state, the electrons in these atoms are very energetic. The electrons will return to their low energy state and emit radiation that we see as light since they don't enjoy being in the high energy state.

Answer:

The element is zirconium metal.

Explanation:

Answer:

It is illegal

Explanation:

Fracking involves drilling deep into the earth crust in which a water mixture with high pressure is directed at the rock with the purpose of releasing the gas inside. This process is common in the exploration of natural gas and other hydrocarbons.

It is however illegal because the water are mostly contaminated due to the hydrocarbons present and harmful to life. It is advisable and the best to remove the water and recycle them in treatment plants

Shortest wavelength of light that can be emitted by a hydrogen atom is 95.0 nm

Emission is the transfer of electron from higher energy level to lower energy level.

Shortest wavelength is the transition with higher energy.

So,

The electron emits from \($n=5$\) to \($n=1$\) level.

The lowest state is:

\(n_1=1$\\\mathrm{n}_2=5$$\)

The Balmer-Rydberg equation is

\($$\begin{aligned}& \frac{1}{\lambda}=R_{\infty}\left[\frac{1}{n_1^2}-\frac{1}{n_2^2}\right] \\& \mathrm{n}_2=5 \text { and } \mathrm{n}_1=1 \\& \mathrm{R}=1.097 \times 10^7 \mathrm{~m}^{-1}\end{aligned}$$\)

\(\frac{1}{\lambda}=R_{\infty}\left[\frac{1}{n_1^2}-\frac{1}{n_2^2}\right]$\\\\$\Rightarrow \frac{1}{\lambda}=1.097 \times 10^7 \mathrm{~m}^{-1}\left[\frac{1}{1^2}-\frac{1}{5^2}\right]$\\\\$\Rightarrow \frac{1}{\lambda}=1.097 \times 10^7 \mathrm{~m}^{-1} \times 0.96=10531200 \mathrm{~m}^{-1}$$\lambda\\\\=\frac{1}{10531200 \mathrm{~m}^{-1}}\\\\=9.50 \times 10^{-8} \mathrm{~m}$$\lambda\\\\=95.0 \times 10^{-9} \mathrm{~m}\\\\=\mathbf{9 5 . 0} \mathbf{n m}$\)

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What is the shortest wavelength of light that can be emitted by a hydrogen atom, if the electron is initially in the n=5 level? Give your answer accurate to three significant figures.

Answer:

A hydrogen bond is the electromagnetic attraction created between a partially positively charged hydrogen atom attached to a highly electronegative atom and another nearby electronegative atom. A hydrogen bond is a type of dipole-dipole interaction; it is not a true chemical bond.

Explanation:

Answer:

The orest one is possible D

Explanation:

2.1 moles of \(H_2O\) will have a mass of 37.8 grams.

The number of moles a substance contains and the mass of the substance are related by the following equation:

Mole = mass/molar mass

In other words, the mole of a substance is the ratio of the mass of the substance and its molar mass.

Rearranging the equation:

Mass = mole x molar mass.

In this case, we want to find the mass of 2.1 moles of water. The molar mass of water can be calculated as follows:

\(H_2O\) = (1 x 2) + 16

       = 18 g/mol

Mass of 2.1 moles of water = 2.1 x 18

                                            = 37.8 grams

In other words, 2.1 moles of water will have a mass of 37.8 grams.

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Answer:

The signal from the deceleration sensor ignites the gas-generator mixture by an electrical impulse, creating the high-temperature condition necessary for NaN3 to decompose. The nitrogen gas that is generated then fills the airbag. hope that helps love!

Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Answer:

compound

Explanation:

Answer:

your answer would be compound

The ion that is likely present in the solution when a deep-blue color appears upon adding NH3(aq) is Cu2+.

When NH3(aq) is added to an aqueous solution, a deep-blue color usually appears due to the formation of a complex ion. The ion that is present in the solution depends on the metal ion present in the solution.

In the case of copper (Cu2+), adding NH3(aq) to an aqueous solution containing Cu2+ ions forms a deep-blue complex ion known as [Cu(NH3)4]2+.This complex ion is responsible for the observed blue color.

On the other hand, adding NH3(aq) to an aqueous solution containing Fe2+ ions forms a pale green complex ion known as [Fe(NH3)6]2+. This complex ion is not responsible for a deep-blue color.

Adding NH3(aq) to an aqueous solution containing Fe3+ ions forms a reddish-brown complex ion known as [Fe(NH3)6]3+. This complex ion is also not responsible for a deep-blue color.The ion Se is not known to form a deep-blue complex ion with NH3(aq).

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A chemical equation must balance according to the rule of conservation of mass. According to the rule, mass cannot be generated or removed during a chemical process. Here the given equation is a balanced one.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the charge are both equal.

A chemical equation is a symbolically expressed chemical reaction, with the reactant entities on the left and the product entities on the right, in the form of symbols and formulas.

In the equation, NaCl₂ + 2NaOH → Na(OH)₂ + 2NaCl

Here the number of 'Na', 'Cl', 'O' and 'H' atoms are equal on both sides of the equation.

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Answer:

evaporation (when water gets warmed up and turns into water vapor) and precipitation(when the ice crystals become so heavy and melt on the way through the troposphere)

Answer:

Explanation:

For the answer to the question above,

Addition of HCl causes a precipitate to form:

Ag+ & Cl- -- AgCl a white ppt

H2SO4 is added to the supernate another precipitate forms:

Ba+2 & SO4-2 --> BaSO4 a white ppt

a solution of NaOH is added to the supernatant liquid until it is strongly alkaline. No precipitate is formed:

no Mn+2 & no Cu+2 which would have ppt as hydroxides

I hope this helps you.

When the concentration of hydrogen gas  is increased, the reaction will shift toward the products right and increase the concentration of HI, to consume the increased concentration of H₂.

Chemical equilibrium is the state at which the rate of forward reaction and backward reaction takes place in the same rate. According to Le-chatlier principle, When any imbalance occurs by some factors to the equilibrium, the system itself balances the disorder and re-establish a new equilibrium state.

An increase in the concentration of reactants will shift the reaction to the forward direction. Similarly, if the product concentration is increased, then the reaction shifts to backward direction to produce reactants.

Here, H₂ is the reactant and increasing its concentration makes the reaction shifts to the direction which consumes H₂. Hence, the reaction will shift toward the products right increasing the concentration of HI.

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Answer:

I searched it up and screenshot it

Explanation:

I searched it up : )

Answer:

8-)

Explanation:

Baking powder is a dry chemical leavening agent, a mixture of a carbonate or bicarbonate and a weak acid. The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch. Baking powder is used to increase the volume and lighten the texture of baked goods

Answer:

The third one is the answer.

Database security refers to all the precautions businesses take to guard against hacks into their database management system (DBMS) and every piece of associated software. This involves implementing policies, practices, and tools designed specifically to safeguard the stored sensitive data. Small businesses that manage and collect huge amounts of data should also have database security standards in place because this problem is not just a problem for big businesses.

The finest database security practices listed below can help keep your databases secure from intruders.

In the conventional sense, this entails securing, locking, and providing access controls for your database server to keep away unauthorized visitors. It also entails maintaining the database on a distinct physical system from those used to operate web servers or applications.

A firewall should be used to safeguard your database server against threats to database security because it by default blocks traffic. Only traffic from certain applications or web servers that require access to the data should be permitted. The firewall ought to prevent your database from opening outbound connections unless absolutely necessary.

The database should only be accessible by the fewest individuals feasible. Administrators should only be granted access when they need it and only for as long as they need it to do their duties. Although this may not be feasible for smaller businesses, at the very least permissions should be handled through the use of groups or roles rather than being directly granted.

To safeguard against the most recent vulnerabilities, it's crucial to routinely upgrade your operating system and database software with all security patches installed. Unless there is a compelling reason for any to be disabled, you should also make sure that any database security controls offered by the database are enabled (most are by default).

This entails keeping an eye on logins (and login attempts) to the database and operating system as well as routinely checking logs to look for unusual activity. To inform the appropriate team members when potentially dangerous activity is found, you may also generate alerts.

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