CHEMISTRY HIGH SCHOOL

What was used to join the stained glass pieces together? a. steel
b. silver
c. lead
d. iron?

Answers

Answer 1
Answer:

In order to join stained glass pieces together lead is used

The lead is preferred material as

a) due to its soft and flexible nature we can easily cut and mold it according to the application area

b) Compared to other options lead is less costly and is long lasting

Thus lead finds its application in came glass work
Answer 2
Answer:  your answer is c) lead.  because a leaded stained glass was used with lead glass which holded the pieces together.

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During nuclear fission, great amounts of energy are produced froma. very small amounts of mass. b. tremendous amounts of mass. c. a series of chemical reactions. d. particle accelerators.
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The digestion process starts in the _____. A.esophagus
B.stomach
C.small intestine
D.mouth

Answers

The digestion process starts in the mouth first, with the mechanical digestion happening with your teeth. And then the saliva breaks down your food with its enzymes. 

Which element is a liquid at STP?
(1) argon (3) chlorine
(2) bromine (4) sulfur

Answers

Answer: Option (2) is the correct answer.

Explanation:

STP means standard temperature and pressure.

At STP chlorine exists as a gas, sulfur exists as a solid and argon also exists as a gas.

Whereas bromine exists as a liquid at STP.

Thus, we can conclude that out of the given options bromine is the element which exists as a liquid at STP.

The element that is a liquid at standard temperature and pressure (STP) is bromine (Br). Therefore, option 2 is correct.

Bromine is the only element among the options given that is a liquid at STP. It is a reddish-brown liquid with a strong and unpleasant odor. Bromine is a halogen and exists as diatomic molecules (Br₂).

It has a boiling point of 58.8°C (137.8°F) and a melting point of -7.2°C (19.0°F). Bromine is significantly more reactive than argon but less reactive than chlorine and sulfur.

Argon (Ar) is a noble gas and exists as a colorless and odorless gas at STP. Chlorine (Cl) is a greenish-yellow gas at STP. Sulfur (S) is a solid at STP and melts at a relatively high temperature.

To learn more about the element, follow the link:

brainly.com/question/31950312

#SPJ6

How much does 9.8 liters of ammonia (NH3) weigh at standard temperature and pressure (273 K and 100 kPa)?

Answers

Answer: The mass of ammonia will be 7.34 g

Explanation:

To calculate the number of moles, we use the equation given by ideal gas equation:

PV=nRT

Or,

PV=(m)/(M)RT

where,

P = pressure of the gas = 100 kPa

V = Volume of gas = 9.8 L

m = Given mass of ammonia = ? g

M = Molar mass of ammonia = 17 g/mol

R = Gas constant = 8.31\text{L kPa }mol^(-1)K^(-1)

T = temperature of the gas = 273 K

Putting values in above equation, we get:

100kPa* 9.8L=(m)/(17g/mol)* 8.31\text{L kPa }mol^(-1)K^(-1)* 273K\n\nm=7.34g

Hence, the mass of ammonia will be 7.34 g
9.8 × 17 / 22.4 = 7. 44g

Salt crystals are shaped like cubes. Salt is part of the _____.

Answers

Answer:

The correct answer is: cubic or isometric crystal system

Explanation:

The cubic crystal system, also known as the isometric crystal system, is one of the seven crystal systems, that has a cubic unit cell.

It can be classified into three types: simple cubic system, body-centered cubic system (bcc) and face-centered cubic system (fcc).

The salt, sodium chloride, forms isometric crystals and thus is part of the cubic or isometric crystal system.
salt is isometric as they're blocks or cubes.

In the formula X2O5, the symbol X could represent an element in Group(1) 1 (3) 15
(2) 2 (4) 18

Answers

Answer: (3) 15

Explanation: We criss-cross down the oxidation numbers to get the subscripts for the correct formulas. That means the X has an oxidation number of 5. The element with the + oxidation number is always written first so it is +5. Of the groups names, only group 15 has +5 as an oxidation number.

Which statement describes a chemical propertyof sodium?
(1) Sodium has a melting point of 371 K.
(2) Sodium has a molar mass of 23 grams.
(3) Sodium can conduct electricity in the liquid
phase.
(4) Sodium can combine with chlorine to produce
a salt.

Answers

Answer;

(4) Sodium can combine with chlorine to producea salt.

Explanation;

Sodium is an alkali metal (group 1 ) in the periodic table. It is a soft metal, reactive and with a low melting point. It has an atomic weight of 23 grams.

Sodium is a good conductor of electricity due to the presence of delocalized electrons in its metallic structure. It reacts vigorously with water to produce sodium hydroxide and hydrogen.

-When exposed to air, metallic sodium recently cut looses its silvery appearance and acquires an opaque grey color due to the formation of a sodium oxide coating.
(4) Sodium can combine with chlorine to produce a salt is the correct answer. The other three are just physical properties~
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