4. What are two careers in science?
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Answer:

0.725 kg

Explanation:

Step 1: Given data

Step 2: Calculate the mass of the softball

We will use the following expression.

K = 1/2 × m × v²

m = 2 K / v²

m = 2 × 145 J / (20.0 m/s)²

m = 0.725 kg

The mass of the softball is 0.725 kg.

Answer:

7.2 × 10^7 is the correct answers.

Thank you ☺️☺️

Answer:

they are call the engine of the cell because they are the one that provides energy for the cells

Answer: B

Explanation:

Answer: BrF

Explanation:

If you look at the six solutions, ammonium chloride is the one that will separate barium ion from lead (II) ion in water.

If you want to separate things in a solution, you can use a solution that preferentially precipitates one of the ions in the solution while leaving the other one in the solution.

Here, we know that chlorides are soluble except those that come from metals like gold and silver because of the rules about which ones can be soluble. This is why, when barium ion and lead (II) chloride are mixed together in water, lead II chloride preferentially precipitates. This means the ions are separated.

I hope this helps you

:)

An unknown solution, which contains both aqueous barium ion, Ba2+ (aq), and aqueous lead(II)ion, Pb2+ (aq). Therefore, option A, D and E are correct.

The maximum quantity of a chemical that will dissolve in a given amount of solvent at a particular temperature is referred to as its solubility. Different compounds have very varying solubilities, which is a feature of a particular solute-solvent pair.

According to solubility rules

1.Li+, Na+, K+, NH4+ always soluble .

2.NO3-, C2H3O2-  always soluble .

3.Cl- , Br-, I- insoluble with Ag+, Hg22+, Pb2+  but soluble with any other ions.

4.SO4- soluble with all the ions except Sr2+, Ba2+, Ca2+, Ag+, Hg22+, or Pb2+.

5. CO32-, PO43- soluble with  Li+ , Na+, K+, NH4+ but insoluble with any other ion.

6.OH- , S2- soluble with Ca2+ , Sr2+ , Ba2+ , Li+ , Na+ , K+ , NH4+ but insoluble with any other ions.

In NH4Cl, cl- ions make precipitate with Pb2+ but not with Ba2+.So, they are separated.

In NaCl, cl- ions make precipitate with Pb2+ but not with Ba2+. So, they are separated.

In NaOH, OH- ions make precipitate with Pb2+ but not with Ba2+.So, they are separated.

Thus, option A, D and E are correct.

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Your question is incomplete, most probably your question is attached below in image.

Answer:

Are held together by strong electrostatic forces of attraction between oppositely charged ions. These compounds have high melting points and high boiling points because of the large amounts of energy needed to break the many strong bonds.

Explanation:

:)

The molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.

The molarity of a solution can be calculated using the following formula:

M = n/V

Molarity = 5.25/6.75

Molarity = 0.78M

Therefore, the molarity of the solution in a large beaker that has 6.75 L of a solution containing 5.25 moles of copper (II) sulfate in water is 0.78M.

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Answer:

0.21 mole of C8H18.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2C8H18 + 25O2 —> 16CO2 + 18H2O

Next, we shall determine the number of mole of C8H18 that reacted and the number of mole water (H2O) produced from the balanced equation.

This is illustrated below:

From the balanced equation above,

2 moles of C8H18 reacted to produce 18 moles of H2O.

Finally, we shall determine the number of mole C8H18 needed to produce 1.90 moles of H2O.

This can be obtained as follow:

From the balanced equation above,

2 moles of C8H18 reacted to produce 18 moles of H2O.

Therefore, Xmol of C8H18 will react to produce 1.90 moles of H2O i.e

Xmol of C8H18 = (2 × 1.90)/18

Xmol of C8H18 = 0.21 mole

Thus, 0.21 mole of C8H18 is needed for the reaction.

Answer:

When an elastic material is stretched or compressed, it exerts elastic force. This force increases the more the material is stretched or compressed. Elastic force has many uses, from hair scrunchies to bed springs.

Explanation:

Answer:

The FIRST option, give me brainliest answer pls

Explanation:

The photosynthesis equation is as follows: 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2 Carbon dioxide + water + energy from light produces glucose and oxygen

Answer:

(a)

carbon dioxide+ glucose+ sunlight * water + oxygen

Explanation:

I Took This Test Before, I Hope You Get A Good Grade On The Rest Of The Questions

Answer:

2 Sb3+ (aq) + 3 S2- (aq) ⇒ Sb2S3 (s)

 Explanation:

Molecular equation for Sb(OH)3 + Na2S

2 Sb(OH)3 (aq) + 3 Na2S (aq) ⇒ Sb2S3 (s) + 6 NaOH (aq)

Ionic equation for Sb(OH)3 + Na2S

2 Sb3+ + 6 OH-  + 6 Na+ + 3 S2- ⇒ Sb2S3 + 6 Na+ + 6 OH-

To get the net ionic, any duplications on the left or right side would be canceled.

∴ Thus, the net ionic equation for Sb(OH)3 + Na2S is 2 Sb3+ (aq) + 3 S2- (aq) ⇒ Sb2S3 (s)

The net ionic equation is a chemical equation that shows only those ions that are involved directly in the formation of the final product. The net ionic equation for the given reaction is [tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex].

It is a chemical equation that shows only those ions that are involved directly in the formation of the final product.

So, molecular equation,

[tex]\bold {2 Sb(OH)_3 (aq) + 3 Na_2S (aq) \rightarrow Sb_2S_3 (s) + 6 NaOH (aq)}[/tex]

Now, write the ionic equation,

[tex]\bold {2 Sb_3^+ + 6 OH^- + 6 Na+ + 3 S_2^- \rightarrow Sb_2S_3 + 6 Na^+ + 6 OH^-}[/tex]

To make a Net ionic equation cancel all the duplicate ions present on both sides of the equation.

[tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex]

Therefore, the net ionic equation for the given reaction is [tex]\bold { 2 Sb3^+ (aq) + 3 S_2^- (aq) \rightarrow Sb_2S_3 (s)}[/tex].

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The volume of CO₂ at 683 torr and 25.0°C released into the atmosphere daily by this company is 2.53×10⁸ L

Mole = mass / molar mass

Mole of CaCO₃ = 9.3×10⁸ / 100

Mole of CaCO₃ = 9.3×10⁶ moles

Balanced equation

CaCO₃ —> CaO + CO₂

From the balanced equation above,

1 mole of CaCO₃ reacted to produce 1 mole of CO₂

Therefore,

9.3×10⁶ moles of CaCO₃ will also react to produce 9.3×10⁶ moles of CO₂

V = nRT / P

V = (9.3×10⁶ × 0.0821 × 298) / 0.899

V = 2.53×10⁸ L

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Answer:

once hydrogen ions are outside the membrane they are allowed to flow back in. this flow is changed to energy that is stored in the bonds of new molecules.

Explanation:

Answer: b

Explanation:

Answer:

Explanation:

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

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 60 g

volume = 2 cm³

We have

[tex]density = \frac{60}{2} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

d.-379 cal/mol

Explanation:

ΔG = ΔG⁰ + RT ln K

for equilibrium ΔG = 0

ΔG⁰ + RT ln K =0

ΔG⁰   =  -  RT ln K

PG ⇒ PEP

K = [ PEP ] / [ PG ]

= .68 / .32

= 2.125

ΔG⁰   =   - 1.987 x 273 x  ln 2.125

= - 409 Cal / mole

Option d is the nearest answer .

Answer:

Option D. Electron clouds with a total of 7 electrons.

Explanation:

For an atom to be neutral (i.e having a charge of zero), the number of protons and electrons must be equal.

Thus, to know which option is correct, we shall determine the number of protons and electrons in the nitrogen atom as given in the question above.

From the question given above, we obtained the following:

Atomic number = 7

Mass number = 14

Number of protons =?

Number of electrons =.?

Next, we shall determine the number of protons in the nitrogen atom as follow:

Atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically,

Atomic number = proton number

Atomic number = 7

Therefore,

Number of protons = 7

Next, we shall determine the number of electrons in nitrogen atom as follow:

Since the atom is neutral (i.e having a charge of zero), the number of protons and electrons are equal i.e

Number of protons = number of electrons

Number of protons = 7

Therefore,

Number of electrons = 7

Thus, the nitrogen atom must have 7 electrons in order for it to be neutral.

**** Check ****

Charge of atom = Proton – Electron

Charge = 0

Proton = 7

Electron = 7

Charge of atom = Proton – Electron

0 = 7 – 7

0 = 0

Answer:

A and D

Explanation:

Took test.

Answer:

3HClO⁴ + Pb(NO³)³ => Pb(ClO⁴)³ + 3HNO²

Answer:

4HCIO4+-3Pb(NO3)3-and3Pb(CIO4)3+4HNO2

Answer:

carbon dioxide and water

Explanation:

Example: Combustion of Methane (CH₄(g))

CH₄(g) + 2O₂(g) => CO₂(g) + 2H₂O(g)**

____________________

Note: The combustion of any hydrocarbon produces CO₂ & H₂O. That is,

Ethane (C₂H₆) + O₂ => CO₂(g) + H₂O(g)

Propane (C₃H₈) + O₂ => CO₂(g) + H₂O(g)

Butane (C₄H₁₀) + O₂ => CO₂(g) + H₂O(g)

The issue remaining is to balance the reaction equation. For these type equation balance Carbon 1st, then Hydrogen and finish with Oxygen. Balancing in this order leaves Oxygen which can be balanced using fractions. If problem requires lowest whole number ratios of elements, simply multiply entire equation by 2 to get standard equation*

______________________

*Standard Equation is defined as the smallest whole number ratios of elements. The 'standard equation' is significant in that it is assumed to be at STP conditions; i.e., 0⁰C (=273K) & 1.0 Atmosphere pressure.

    => 2C₂H₆ + 7O₂(g) => 4CO₂(g) + 6H₂O(g)  <= Standard Form of Rxn

    => 2C₃H₈ + 13O₂(g) => 4CO₂(g) + 5H₂O(g) <= Standard Form of Rxn

______________________

**Also, note that water, H₂O(g), is listed as a gas. In some cases it will be listed as a liquid, H₂O(l).

A substance burning in the presence of oxygen produces heat and light, a process known as combustion. Combustible compounds are defined as those substances that burn. Carbon dioxide and water are the products. The correct option is B.

The process of combustion is a chemical interaction between the fuel (hydrocarbon) and the oxygen. Heat and light energy are released when fuel and oxygen react. The flame then develops from the energy of heat and light. Hydrocarbon + Oxygen = Heat energy is the equation for a combustion reaction.

Complete combustion occurs when there is a sufficient amount of air available. The hydrocarbon fuel's carbon and hydrogen atoms undergo an exothermic reaction with oxygen to form carbon dioxide and water. Energy is released.

Thus the correct option is B.

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Answer:

Ca2+

Explanation:

don't really know what to explain here, thats just the ion name.

In the formular X repesents Sulphur

H2X = 34

mass of H = 2

( 1 ) * 2 + X = 34

X = 34 - 2

X = 32

X is an element with atomic mass of 32 which is Sulphur

hope it helps....

Because the extent of ionic charge is more important than ionic radius in calculating the lattice energy of ionic compounds. Because the ionic charge of the N3-ion is greater than that of the F-ion, the Na3N molecule has a higher lattice energy than the NaF complex.

The lattice energy increases when the ion charge variable is increased. As a result, ions with higher charge values generate ionic compounds with higher lattice energies. As a result, ions with lower charges lower the lattice energies of their compounds.

Answer: Heat energy is another name for thermal energy.

Explanation:

As thermal energy comes from moving particles, it is a form of kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature.

Answer:

When a substance heats up, the rise in temperature makes these particles move faster and bump into each other. Thermal energy is the energy that comes from the heated up substance. The hotter the substance, the more its particles move, and the higher its thermal energy.

Answer:

100

Explanation:

follow the basic order of events using the formula

V is velocity so 20m/s

M is mass so 0.5kg

20^2 is 400

so then 1/2 * 0.5 is .25

then .25 * 400 is 100 (KE)
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