which of the four cars had the least net force applied to it when it was launched down the ramp

Answer:

The third option "A molecule of a compound is composed of at least two types of atoms" is correct

Explanation:

This question isn't about molecules, it's about elements and compounds.

Elements are made of one and only one type of atoms, while compounds are made of more than one type of atoms.

(Molecules are just groups of atoms, it doesn't matter what they're made of)

Answer:

a

Explanation:

ionic compounds are electrically neutral overall. therefore, the sum of the charges on the cation and anion in each formula unit must be equal to zero

Ions are charged particles that form when an atom (or group of atoms) receives or loses an electron, and ionic compounds are composed of these charged particles. An anion is a negatively charged ion, whereas a cation is a positively charged ion.

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Answer:

(1)  LiCl + CaBr2 → CaCl2 + LiBr

     Balanced

    2LiCl + CaBr2 → CaCl2 + 2LiBr

(2) Cr(OH)3 + Na2CO3 → NaOH + Cr2(CO3)3

     Balanced

     2Cr(OH)3 + 3Na2CO3 → 6NaOH + Cr2(CO3)3

(3)   Sr3N2 + KClO3 → Sr(ClO3)2 + K3N

      Balanced

      Sr3N2 + 6KClO3 → 3Sr(ClO3)2 + 2K3N

(4) Fe(NO3)2 + AlPO4 → Fe3(PO4)2 + Al(NO3)3

     Balanced

      3Fe(NO3)2 + 2AlPO4 → Fe3(PO4)2 + 2Al(NO3)3

(5) CuSO4 + AgNO3 →  Ag2SO4 + Cu(NO3)2

     Balanced

     CuSO4 + 2AgNO3 →  Ag2SO4 + Cu(NO3)2

(6)   HCl + Ba(OH)2 → H2O + BaCl2

      Balanced

       2HCl + Ba(OH)2 → 2H2O + BaCl2

(7) CsCN + SnF4 → CsF + Sn(CN)4

    Balanced

  4CsCN + SnF4 → 4CsF + Sn(CN)4

(8) (NH4)2S + Mg(NO3)2 →  MgS + NH4NO3

     Balanced    

     (NH4)2S + Mg(NO3)2  → MgS + 2NH4NO3

(9) Na2CrO4 + Mo(OH)3 → NaOH + Mo2(CrO4)3

    Balanced

    3Na2CrO4 + 2Mo(OH)3 → 6NaOH + Mo2(CrO4)3  

(10) Ni(C2H3O2)2 + H3PO4 → Ni3(PO4)2 + C2H4O2

      Balanced

     3Ni(C2H3O2)2 + 2H3PO4 → Ni3(PO4)2 + 6C2H4O2

Answer:

It is false.

Explanation:

Weathering is the general process by which rocks are broken down at Earth's surface. Erosion is a set of processes that loosen and move soil and rock downhill or downwind. Umm...for example, imagine you are having ice cream in your hand out on a sunny day, if the ice-cream melts and falls down, it is called erosion and if the ice-cream melts but it doesn't fall down, it called weathering.

Maximum wavelength of light capable of dissociating the f-f bond is 7.6245 nm.

Wavelength related to bond dissociation energy is calculated by first calculating the energy required to break one f-f bond which is calculated as,

energy required to break a bond=bond energy/Avogadro's number

In this case which is equal to,157×10³/6.022×10²³=2.6071×10[tex]^-19[/tex] J.

Now to calculate wavelength, Planck's equation is used which is,

E=hc/λ

∴λ=6.626×10[tex]^-34[/tex]×3×10⁸/2.6071×10[tex]^-19[/tex]

=7.6245×10[tex]^-7[/tex] m or 7.6245 nm

Thus, the maximum wavelength of light capable of dissociating the f-f bond in one molecule of fluorine is 7.6245 nm.

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A safety data sheet is informational data that states the properties of the various chemicals. According to the SDS of NaOH, it causes irritation, nausea, eye burn, burns in the digestive system, etc.

SDS is abbreviated for a safety data sheet which is a document that provides information on the chemicals including the properties, health hazards, measures, safety, prevention, etc.

According to SDS, NaOH results in various potential acute health effects including vomiting, diarrhea, nausea, irritation, etc. The chronic effect includes coma, burns in the eye, respiratory infection, digestive system, dermatitis, etc.

Therefore, sodium hydroxide has various acute and chronic health effects.

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Your question is incomplete, but most probably your full question was, Use the internet to look up the sds for 2.0 m sodium hydroxide, NaOH, to answer the following question: list the potential acute and chronic health effects.

Answer:

d

Explanation:

it's the only one that seems to make sense

Answer:

it is useful in diagnostics and treatment applications

Answer:

The average Olympic sprinter runs 8 m/s.

Explanation:

Speed is defined as the change of an object from one position to another position with respect to the time taken. It is independent of direction and only depends on the change of its position.

In the context, all the other sentences has direction mentioned in the sentence except the sentence "the average Olympic sprinter runs 8 m/s". In this sentence, the speed of an Olympic sprinter id given i.e. 8 meter per second.

Through homogeneous co-precipitation and traditional solid-state calcining, a red long persistent phosphor of -Zn3(PO4)2: Mn2+, Mg2+ was created.

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Answer:

Sodium Fluoride F 18 Injection is a positron emitting radiopharmaceutical, no-carrier added.

Explanation:

Element Name Fluorine

Element Symbol F

Atomic Number 9

Gina is trying to reduce the number of indoor pollutants in her home. Indoor pollutants include pet hair and dust, which are (c) allergens and radon and carbon monoxide, which are (a) gases.

Allergens are the substances that trigger the immune system of an organism and also produce allergic effects. Allergens can induce symptoms like: redness, itching, sneezing, coughing, etc. The examples of allergens are pollens, certain microbes, dust, pet hair, etc.

Radon is a highly poisonous and radioactive gas present in the environment. It is one of the major causes for lung cancer. It is inert and colorless in nature. Radon is present in environment due to decay of uranium which is present in soil naturally.

The question is incomplete, the complete question is:

Gina is trying to reduce the number of indoor pollutants in her home. Indoor pollutants include
A- pet hair and dust, which are:
(a) gases, (b) smoke, (c) allergens, (d) smog; and
B- radon and carbon monoxide, which are:
(a) gases, (b) smog, (c) allergens, (d) smoke.

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Answer:

V ≈ 2.9 L H₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Chemistry - Reactions

Chemistry - Gas Laws

Combined Gas Law: PV = nRT

Temperature Conversion: K = °C + 273.15

Explanation:

Step 1: Define

Unbalanced RxN:   Zn (s) + HCl (aq) → ZnCl₂ (aq) + H₂ (g)

Balanced RxN:   Zn (s) + 2HCl (aq) → ZnCl₂ (aq) + H₂ (g)

Given:   7.68 g Zn, 20.00 °C, 740 mmHg

Step 2: Identify Conversions

Kelvin Conversion

Molar Mass of Zn - 65.39 g/mol

Step 3: Convert

Stoichiometry:   [tex]7.68 \ g \ Zn(\frac{1 \ mol \ Zn}{65.39 \ g \ Zn} )(\frac{1 \ mol \ H_2}{1 \ mol \ Zn} )[/tex] = 0.117449 mol H₂

Temp Conversion:   20.00 + 273.15 = 293.15 K

Step 4: Find V

Step 5: Check

We are given 2 sig figs as our lowest. Follow sig fig rules and round.

2.9033 L H₂ ≈ 2.9 L H₂

Answer:

Yes adrenaline is radioactive.

Explanation:

Answer:

In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters, and must be clearly distinguished from the other variables.

Explanation:

Answer:

Atoms must have equal numbers of protons and electrons. In our example, an atom of krypton must contain 36 electrons since it contains 36 protons.

Explanation:

Hope this helps and I hope u have an Amazing day!!

Answer:

There are 5.69*10²⁴ molecules in 9.45 moles.

Explanation:

The mole is defined as the amount of matter that particles have, that is, atoms and elementary entities.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole and represents a quantity without an associated physical dimension. Avogadro's number applies to any substance.

Then the following rule of three can be applied: if 1 mole contains 6.023 * 10²³ molecules, 9.45 moles, how many molecules will it have?

[tex]amount of molecules=\frac{9.45 moles*6.023*10^{23}molecules }{1 mole}[/tex]

Solving:

amount of molecules= 5.69*10²⁴⁴ molecules

There are 5.69*10²⁴ molecules in 9.45 moles.

Answer:

C proton hope it helps <3

Explanation:

Answer:

not

medium

Explanation:

Light radiation travels as a wave and does not require a medium for travel. Like all electromagnetic radiations, light does not need medium particles for its propagation.

The major difference between heat transfer by conduction and convection and heat transfer by radiation is that heat transfer by conduction and radiation requires a material medium, while heat transfer by radiation is done by electromagnetic waves and doesn't require a medium.

Heat or thermal energy is the energy generated when atoms or molecules move in a variety of directions (translational, rotational and vibrational). The three methods of heat transfer are convection, conduction and radiation. Conduction only occurs between solid objects in contact, convection occurs within a fluid, and radiation occurs through electromagnetic waves.

Unlike conduction and convection, radiation doesn't require a material medium before heat is transferred, as electromagnetic radiations don't require a material medium to propagate. Heat is transferred by radiation through infrared rays. Other differences include:

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Answer:

a) 2

b) 2

c) 5

d) 5

e) 5

Explanation:

a) There is 1 Ag atom and 1 Cl atom. When there's no subscript number next to an element, it means there is only one.

b) There is 1 Ca atom and 1 O atom.

c) There are 3 Mg atoms (there's a subscript 3 next to Mg) and 2 N atoms.

d) There are 2 Al atoms and 3 O atoms.

e) There are 2 Sc atoms and 3 S atoms.

Answer:

Molar mass = 105 g/mol

Explanation:

Given data:

Mass of gas = 3.15 g

Pressure = 785 mmHg

Temperature = 20°C

Volume of gas = 750 mL

Molar mass of gas = ?

Solution:

Pressure = 785 mmHg (785/760 = 1 atm)

Temperature = 20°C (20+273 = 293 K)

Volume of gas = 750 mL (750 mL× 1 L/1000 mL = 0.75 L)

PV = nRT

R = general gas constant (0.0821 atm.L/mol.K)

1 atm× 0.75 L =  n×0.0821 atm.L/mol.K × 293 K)

0.75 atm.L = n× 24.06 atm.L/mol

n = 0.75 atm.L / 24.06 atm.L/mol

n = 0.03 mol

Molar mass of gas:

Molar mass = Mass / number of moles

Molar mass = 3.15 g/ 0.03 mol

Molar mass = 105 g/mol

Answer:

TRUE

Explanation:

Answer:

Similarities:

1. Electrostatic attraction between particles of unlike charges. occurs in both ionic compounds and metals

2. Both involve metallic cations. Metallic cations are present in both ionic compounds and in metals.

3. Both ionic compounds and metals have a crystal lattice structure in their solid state.

4. Both ionic compounds and metals have high melting and boiling points

5. Both can conduct electricity although ionic compound do so only in molten or solution form.

Differences:

1. The crystal lattice of an ionic compound consists of two oppositely charged ions of two or more elements whereas metals lattices consists of metal cations and delocalised electrons of the same metal.

2. Ionic compounds are compounds whereas metals are elements.  

3. Ionic compounds are brittle whereas metals are malleable and ductile.

4. Electrons are transferred from one atom to another in ionic compounds whereas in metals,  are delocalised around metallic cations

5. Metals are sonorous and are shiny whereas ionic compounds are not.

Importance of ionic compounds and metals

Ionic compounds are important as salts in industries, as food additives, in detergent and soap-making, as electrolytes and in biochemical systems.

Metals are important in building and construction industry, in jewellery, as conductors in wires and electrode plates, in making parts for vehicles used in transportation

Common ionic compounds and their uses:

Sodium chloride, Potassium iodide and Sodium fluoride are used as a food additive and preservative, as electrolytes, as well as in toothpastes for healthy teeth.

Common metals and their uses

Iron, Aluminum and Gold are used in steel production, making many cooking utensils and for making jewelleries

Explanation:

Similarities:

1. Electrostatic attraction between particles of unlike charges. occurs in both ionic compounds and metals

2. Both involve metallic cations. Metallic cations are present in both ionic compounds and in metals.

3. Both ionic compounds and metals have a crystal lattice structure in their solid state.

4. Both ionic compounds and metals have high melting and boiling points

5. Both can conduct electricity although ionic compound do so only in molten or solution form.

Differences:

1. The crystal lattice of an ionic compound consists of two oppositely charged ions of two or more elements whereas metals lattices consists of metal cations and delocalised electrons of the same metal.

2. Ionic compounds are compounds whereas metals are elements.  

3. Ionic compounds are brittle whereas metals are malleable and ductile.

4. Electrons are transferred from one atom to another in ionic compounds whereas in metals,  are delocalised around metallic cations

5. Metals are sonorous and are shiny whereas ionic compounds are not.

Importance of ionic compounds and metals

Ionic compounds are important as salts in industries, as food additives, in detergent and soap-making, as electrolytes and in biochemical systems.

Metals are important in building and construction industry, in jewellery, as conductors in wires and electrode plates, in making parts for vehicles used in transportation

Common ionic compounds and their uses:

Sodium chloride: sodium chloride is an ionic compound composed of sodium and chloride ions. It is commonly used as a food additive and preservative, as an electrolyte, as well as the extraction of sodium metal.

Potassium iodide: it is composed of potassium and iodine ions. It is added to “iodized” salt to prevent goitre.

Sodium fluoride: it consists of sodium and fluoride ions. It is an important ingredient in toothpaste for healthy teeth.

Common metals and their uses

Iron; iron is used in steel production which is used for constructing bridges, houses, and various machinery parts

Aluminum: it is used in making many cooking utensils like pots and pans

Gold: it is used in making jewelleries and ornaments.

Iconic bonds only form with metals and non metals. They have to give up electrons and non metals want to gain electrons.

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Answer:

i think 70inches

Explanation: