which blue and violet gemstone is used as the birthstone for december?

Answers

Answer 1

Answer:

Tanzanite

Explanation:

Tanzanite is the exquisite blue-purple variety of the mineral zoisite that is only found in one part of the world. Named for its limited geographic origin in Tanzania, tanzanite has quickly risen to popularity since its relatively recent discovery.


Related Questions

why must a ph meter be calibrated by using a solution with a known ph value

Answers

Answer:

A pH calibration is the process of adjusting your pH meter by measuring solutions of a known pH value. This is because the characteristics of your electrode will change over time and this needs to be compensated for. A calibration does this by matching your pH meter to the current characteristics of your pH sensor.

Explanation:

RNA is a double strand. True or False?

Answers

Answer:

False, RNA is single stranded, DNA is double stranded and forms a double helix

Explanation:

4. When a turbine spins, it generates electrical energy and that is where it gets its name from.

Answers

if it’s hydraulic turbine then it’s potential and kinetic energy and if it’s a thermal process then heat energy from the fuel burnt runs the turbine

Calcolate resulant force 15N <-[]->20N​

Answers

Explanation:

5N right because -15N for left plus +20N for right = +5N

How to get your crush to like you back

Answers

Make sure there’s “chemistry” between you two
answer:
i’m just going to say this…
if people stop talking to you, or seeing you it’s for a reason. things don’t happen on accident, so if your crush stopped liking you then it was for a reason wether you realize it or not.
hope this helps!

I need help with stoichiometry

Answers

Um I don’t know what stoichiometry is. So I can’t help I am sorry wish I could

Jacinta wrote the following passage about chemical changes.

A chemical change is a change that results in one or more new substances with different properties. When a chemical change occurs, the new substance can give off an odor, such as rotting fruit or cookies baking in the oven. Chemical changes can cause color changes, such as iron rusting and turning a reddish-brown color. When wood is burned or ingredients are mixed for baking a cake, a new substance is made.

Choose the best statement that Jacinta can add to her passage.

Chemical changes, such as rotting fruit and burning wood, are affected by temperature. More heat and energy causes a faster chemical change.
Wood burning and fruit rotting creates new substances through a chemical change that is affected by sound energy.
Rotting fruit and burning wood is a chemical change that occurs because there is a decrease in temperature. Less heat causes a faster chemical change.
When a chemical change occurs, the new substance that is created has properties similar to the original substance.

Answers

She should add either the 3rd or fourth statement

The very act of you observing something
will disturb the system is known as:

Answers

Answer:

The observer effect is the answer.

Do the ingredients changing into a cake in the oven a chemical reaction?

Answers

Answer:

When you bake a cake, the ingredients go through a chemical change. A chemical change occurs when the molecules that compose two or more substances are rearranged to form a new substance! When you start baking, you have a mixture of ingredients. The flour, egg, sugar,

Explanation:

mass is the gravitational pull on the earth
-tru
-fals
plz help

Answers

It is TRUE that mass is indeed the gravitational force that pulls on earth

Answer:

I believe the answer is false

Explanation:

Earth's gravity comes from all of its mass. All the mass makes a combined gravitational pull on all the mass in an object. If you were on a planet with less mass than Earth, you would weigh less than you do here. Mass is the quantity of matter in a physical body. It is also a measure of the body's inertia, the resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies. Mass is not the gravitational pull on the earth.

Write the chemical formulas and names for the following ionic compounds. Barium and phosphate 

Answers

Barium is Ba. Atomic no. 56 and atomic mass =137.3.

Phosphate is naturally occurring form of phosphorus. Phosphate is P. Atomin no. 15 and atomic mass =31.0.

What products are obtained by the electrolysis of CuSO4 solution using copper electrode ? Show with help of chemical reaction.​

Answers

Answer: The products will be copper and oxygen.

Explanation: Copper electorde is an active electrode so it constantly takes part in the electrolysis. Cathode is a pure copper negative electrode and anode is a impure copper positive electrode. So the copper present in the solution, along with the copper present in the anode will come off and go to the cathode. As a result, cathode gains copper. And the remaining impurities settle down in the bottom.

In the anode, oxygen will be given off because according to the order of discharge, if SO4 is present then the ions will stay in the solution and oxygen will be released. So at the end, solution of SO4 and H2O will be remaining while copper and oxygen is extracted.

The half equations are-

Cathode: Cu2+ + 2e- = Cu

Anode: Cu + 2e- = Cu2+

Something you might not know: The solution in electrolysis turns blue when copper goes to the cathode. So copper electrodes are also used in electroplating.

Which of the following methods of heat transfer causes the tectonic plates to move?

Conduction
Convection
Evaporation
Radiation

Answers

Convection. As Magma is a fluid.

How many moles of Iron (III) Oxide are found in 429 grams of Iron III Oxide?

Answers

Answer:

2.686485288205376 Explanation:

1 grams Iron(III) Oxide is equal to 0.0062622034690102 mole.

The speed at which a chemical reaction proceeds is called

Answers

Answer:

Answer: Reaction Rate

Explanation:

reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

In water is the mass of one molecule equal to the mass of one molecule in steam

Answers

Answer:

The mass of one mole of water molecule = 18 ×N  

A  amu

Explanation: The mass of one mole of water molecule = Mass of one molecule ×N A Also mass of one mole of water is its molar mass in grams. So the mass of one mole of water is 18 g

1. Atomic mass of 12 and 6 neutrons what is the atomic number?

Answers

Answer:

The atomic number would be 12.

Explanation:

A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons.

What type of volcano is formed at a weak spot in the middle of a plate?
a.
lava
c.
hot spot
b.
fault
d.
plate

Answers

Hot spot volcano is the type of volcano which is formed at a weak spot in

the middle of a plate.

Hot spot volcano is an area in the Earth crust which is characterized by large

amount of heat flow in the area due to the volcanic activity. Hot spot  

volcano is formed at the middle of the plate as against junctures in which

other types are formed.

The weak spot is what gives rise to the unusual heat flow which makes hot

spot volcano most appropriate.

Read more about Hotspot volcano on https://brainly.com/question/264008

How is a chemical equation different from mathematical equation?
Only chemical equation uses + sign
Only chemical equation uses arrow instead of = sign
Only chemical equation has numbers
Only chemical equation has minuses

Answers

Answer:

Only chemical equation uses arrow instead of = sign

Answer:

Only chemical equation uses an arrow instead of a = sign.

A chemical equation depicts a chemical reaction by utilising chemical formulae and symbols to depict the reactants, products, and chemical changes that take place. In a chemical equation, the arrow indicates the direction of the reaction and is commonly depicted as a single arrow pointing from the reactants to the products. In contrast, the equals sign (=) is commonly used in mathematical equations to indicate that two expressions have the same value.

While numbers are used to indicate the relative proportions of reactants and products and minus signs are used to indicate reactants or products in the form of ions, the arrow is the most distinguishing feature that distinguishes chemical equations from mathematical equations.

Don’t understand this science Question.

Answers

What is the question?

Answer:

I got you..you need help but with which question?

Explanation:

Have a great day!

15. Which reaction produces a coloured substance?
A. The addition of sodium metal to water.
B. The addition of sulfur dioxide gas to water.
C. Burning sodium metal in chlorine gas.
D. The addition of chlorine gas to a solution of potassium iodide.

Answers

Answer:

the addition of chlorine gas to a solution of potassium iodide.

The reaction that produces a colored substance is the addition of chlorine gas to a solution of potassium iodide. The correct option is D.

What is a chemical reaction?

In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, when humans breathe in oxygen, it combines with glucose to create carbon dioxide, water, and energy.

Another sign that a chemical reaction has taken place is a change in color. If two solutions are combined and a color change occurs that is not just the effect of diluting one of the reactant solutions, a reaction has taken place. A solid and a liquid combined may also result in a change in color.

Therefore, the correct option is D. The addition of chlorine gas to a solution of potassium iodide.

To learn more about chemical reactions, refer to the link:

https://brainly.com/question/22817140

#SPJ2

How does a paper bag wrapped around a hot water bottle create convection?

Answers

How does a paper bag wrapped around a hot water bottle create convection?

Heat is a form of energy. You need energy to heat something up: for example, a cup of tea. To make your tea you probably use energy from electricity or gas. However, once your tea is hot, it won't stay hot forever. Just leave the cup of tea out on the table for a while, and you already know that it will become cooler the longer you wait. This is due to a phenomenon called heat transfer, which is the flow of energy in the form of heat. If two objects have different temperatures, heat automatically flows from one object to the other once they are in contact. The heat energy is transferred from the hotter to the colder object. In the case of the tea, the heat of the liquid is transferred to its surrounding air, which is usually colder than the tea. Once both objects reach the same temperature, the heat transfer will stop. Heat transfer via movement of fluids (liquids or gases) is called convection.




Want to keep warm this winter? Try this "cool" activity and find out what types of insulation work best--and why. Credit: George Retseck

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Key concepts
Physics
Heat transfer
Insulation
Material science
Introduction
What do you do when it gets very cold in winter? You probably turn your heater on, put on an extra layer of clothes or cuddle under a warm blanket. But have you ever thought about why a jacket helps you stay warm? Why are our clothes made from fabrics and not foils? Find out the answers in this activity; your results might even help you find the best way to stay warm in the cold!
Background
Heat is a form of energy. You need energy to heat something up: for example, a cup of tea. To make your tea you probably use energy from electricity or gas. However, once your tea is hot, it won't stay hot forever. Just leave the cup of tea out on the table for a while, and you already know that it will become cooler the longer you wait. This is due to a phenomenon called heat transfer, which is the flow of energy in the form of heat. If two objects have different temperatures, heat automatically flows from one object to the other once they are in contact. The heat energy is transferred from the hotter to the colder object. In the case of the tea, the heat of the liquid is transferred to its surrounding air, which is usually colder than the tea. Once both objects reach the same temperature, the heat transfer will stop. Heat transfer via movement of fluids (liquids or gases) is called convection.


Another type of heat transfer is conduction, in which energy moves through a substance (usually a solid) from one particle to another (unlike in convection where it’s the heated matter itself that moves). A pot handle getting hot would be an example of conduction.

How many atoms are in 2 moles of oxygen?

Answers

Answer:

6.02 × 1,023

Explanation:

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1,023 molecules of oxygen but 12.04 X 1,023 (2 X 6.02 X 1,023) atoms, because each molecule of oxygen contains two oxygen atoms.

A student creates a hypothesis about their upcoming experiment. What must the
student do in their experiment with relationship to their hypothesis?
create a law based on the hypothesis
change the experiment to make the hypothesis correct
ignore the hypothesis
make observations to prove or disprove the hypothesis

Answers

Answer:

D. make observations to prove or disprove the hypothesis

Explanation:

calculate the mass of sodium sample that it contains 2 Na atoms of sodium

please i need help with this ques. ​

Answers

Answer:

45.98 I believe if its wrong im sorry

How many moles of nitrogen dioxide, NO2, are present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L

Answers

There are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.

IDEAL GAS LAW:

The number of moles of nitrogen dioxide (NO2) in this question can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)V = volume (L)T = temperature (K)R = gas law constant (0.0821 Latm/molK)n = number of moles

According to the reaction conditions given in this question;

P = 2.46 atmV = 4.8Ln = ?T = 330K

2.46 × 4.8 = n × 0.0821 × 330

11.81 = 27.093n

n = 11.81 ÷ 27.093

n = 0.436mol

Therefore, there are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.

Learn more about the ideal gas law at: https://brainly.com/question/4147359?referrer=searchResults

what is the number of protons in a neutral atom with 31 electrons and 38 neutrons?

Answers

31

I think. Protons and electrons share the same number as well as the atomic number.

Answer:

31 protons

Explanation:

Protons are positively charged and electrons are negatively charged so if it is a neutrally charged atom (which most are) the protons and electrons will be equal.

7. Balance the following reaction under basic conditions: Al (s) + Cr2O72- (aq) -> Al3+ (aq) + Cr3+ (aq)

8. What is the ^o of the following balanced redox reaction (use the reduction potentials provided in Table 11.1
below)?

Fe3+ (aq) + Au (s) -> Fe (s) + Au3+ (aq)

9. What is G for the reaction below – calculate it from the ^o ?

Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s)

Answers

The free energy change of the reaction; Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s) is calculated to be -443.83KJ/mol.

For the reaction shown in question 7, we can divide it into half equations as follows;

Oxidation half equation;

6 Al (s) -------> 6Al^3+(aq) + 18e

Reduction half equation;

3Cr2O7^2-(aq) + 42H^+(aq)   + 18e -----> 6Cr^3+(aq) + 21H2O(l)

The balanced reaction equation is;

6Al(s) + 3Cr2O7^2-(aq) + 42H^+(aq)   -----> 6Al^3+(aq) + 6Cr^3+(aq) + 21H2O(l)

The E° of this reaction is obtained from;

E° anode = -0.04 V

E°cathode = +1.50 V

E° cell = +1.50 V - (-0.04 V) = 1.54 V

Given that;

ΔG° = -nFE°cell

n = 3, F = 96500, E°cell = 1.54 V

ΔG° = -(3 × 96500 × 1.54)

ΔG° = -443.83KJ/mol

Learn more: https://brainly.com/question/967776

How many grams of potassium sulphate are formed when 49g of sulphuric acid in solution are neutralised by potassium hydroxide?

Answers

C - keep counting to the atoms

Help me ASPAPPPPPPPPP

Answers

Answer:

Explanation:

1.  H2O

Lewis Dot:  

See the attachment.

Note the б+ and б- signs on the H and O atoms, respectively.  Those represent the slightly positive and slightly negative sides of the water molecule.  Those slight charges on a single water molecule are attracted to their opposite charges on neighboring H2O molecules, as shown in the graphic.  This interaction is what gives water it's cohesive properties.

3.  The property of cohesion describes the ability of water molecules to be attracted to other water molecules. which allows water to be a "sticky" liquid.

The hydrogen bonds are attractions of electrostatic force.  They arise due to the difference in charge between the slightly positive hydrogen ion and the slightly negative oxygen ion. Hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond, and it is what gives water it's cohesiveness, or ability to support water spiders, paper clips, and produces a loud noise in the event of a belly flop in a pool (including the yelp from the swimmer).

4.  I'm not sure what is being asked for the two blanks.  Water is polar and dissolves salts (ionic compounds) and hydrophilic molecules (water-loving molecules).

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