CHEMISTRY HIGH SCHOOL

Of the elements Na, C, Si, and P, which is a metal?a. Na
b. C
c. Si
d. P

Answers

Answer 1
Answer:

Answer: Option (a) is the correct answer.

Explanation:

A metal is a substance which loses electron(s) in order to attain stability.

For example, sodium is an alkali metals with atomic number 11 and its electronic distribution is 2, 8, 1.

So, in order to attain stability sodium will readily lose 1 electron and forms Na^(+) ion.

Whereas non-metals are the substances which gain electron(s) in order to attain stability.

For example, atomic number of carbon is 6 and its electronic configuration is 2, 4.

To attain stability a carbon atom shares it 4 valence electrons with another atom.

Thus, we can conclude that out of the given options, Na is a metal.
Answer 2
Answer: a. Na - Sodium

Sodium is an alkali metal in Group 1A of the periodic table.  Metals are found in groups 1A, 2A, and 3A, along with the transition and inner transition metals.

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To what volume in millimeters must 50.0 mL of 18.0 M H2SO4 be diluted to obtain 4.35 M H2SO4?
a cylinder of oxygen gas is cooled from 300K to 150K by what factor does the average kinetic energy of the oxygen molecules in the cylinder decrease
What is the volume of 0.30 M NaOH(aq) neededto completely neutralize 15.0 milliliters of0.80 M HCl(aq)?(1) 3.6 mL (3) 20. mL(2) 5.6 mL (4) 40. mL
The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 4.00 g of butane?

Two very stable compounds, Freon-12 and Freon-14, are used as liquid refrigerants. A Freon-12 molecule consists of one carbon atom, two chlorine atoms, and two fluorine atoms. A Freon-14 molecule consists of one carbon atom and four fluorine atoms.81 In the space in your answer booklet, draw a structural formula for Freon-12. [1]

82 To which class of organic compounds do Freon-12 and Freon-14 belong? [1]

Answers

81. There is 1 carbon, 2 chlorine and fluorine atoms in Freon 12. To draw them it forms a cross with C in the middle and Cl and F both on the opposite side. 
     Cl
      l
F - C- F
      l
     Cl

82. Freon-12 and Freon-14 are called halocarbons or just halides. 

Answer:

- The structural formula for Freon-12 (CCl2F2)

      F

       |

Cl - C - Cl

       |

      F

It has the same structure as methane (CH4) with Hydrogen atoms replaced by Chlorine and Fluorine

- Freon-12 and Freon-14 belong halocarbons, a compound in which the Hydrogen of a hydrocarbon is replaced by halogens, like Chlorine and Fluorine.

What is the half-life of the substance as determined by the graph?​

Answers

Answer:

6.25

Explanation:

Because 2.5 is half and idk know how to explain but  yeah

One mole of ice at 0°C is added to two moles of water at 50°C under a constant external pressure of 1 atm. This process is carried out in a thermally insulated vessel, such that no heat can escape the vessel. When equilibrium is reached, all of the ice has melted. Given: Δ H f u s i o n ∘ ( H 2 O a t 0 ∘ C ) = 6.01 k J m o l C p ( H 2 O , l i q u i d ) = 75 J m o l K a) (7 Points) Calculate the final temperature of the mixture (in °C). Show all work to support your answer.

Answers

Answer:

T2 = 29.79°C

Explanation:

Equliibrium signifies that heat loss = heat gained

Heat gained by Ice;

H = ML

Mass, M = Number of moles * Molar mass = 1 * 18 = 18g

l = 6.01 k J m o l = 334 J/g

C = 4.186 J/g

H =  18(334)

H = 6012

Heat lost by water

H = MCΔT

H = 18 * 4.186 * (50 - T2)

H = 3767.4 - 75.348T2

Since H = H, we have;

6012 = 3767.4 - 75.348T2

- 75.348T2 = 3767 - 6012

T2 = 2245 / 75.348

T2 = 29.79°C

Which of the following affects the rate of a chemical reaction?A. the presence of a catalyst
B. the temperature
C. the concentration of reactants
D. all of the above

Answers

The following that affects the rate of a chemical reaction is the presence of catalyst, temperature, and concentration of reactant. The correct option is D.

What is the rate of a reaction?

The rate of reaction is the speed of the reaction at which a reaction takes place.

The catalyst increases the rate of reaction.

The increase in temperature increases the rate of reaction.

Thus, the correct option is D. all of the above.

Learn more about  the rate of a reaction

brainly.com/question/8592296
D. A ll of the above. catalyst reduces the activation energy thereby making the reaction faster. an increase in temperature  increases the kinetic energy and no of collisions making reaction faster for an endothermic reaction while decrease in temperature favors an exothermic reaction.
increase in concentration increases the molecules reacting so the reaction is faster and vice versa.

Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? TA B Block A has a higher temperature than block B heat flow The two blocks are the same temperature and heat flow stops Heatis transferred from the wamer block to the cooler block 2012 Encyclopædia Batannlea, Inc. B B heat flow ​

Answers

Answer:

Heat is transferred from the warmer block to the cooler block

Explanation:

Heat transfer by conduction involves two or more solids. The heat generally moves from a part at higher temperature to one with a lower temperature.

  • Heat transfer is based on the differences in temperature profile on a body.
  • When the temperature of the body is the same, heat is not transferred.
  • The molecules that makes up the hotter body collides with static molecules of the cold one.
  • Through this, heat is transferred.

Which state of matter is more dense?​

Answers

Answer:

Gas - Liquid - Solid

Explanation:

If you are asking which state of matter is more dense of which, then this is the order.

- Liquid is more dense than Gas

- Solid is more dense than Liquid

- Gas is less dense than Air

Just to let you know, Solid is the most dense of them all, making Gas the least dense of the three.

Hope this helps! ^^

solids have more dens than any type of matter and I am sure btw
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