Answer:
There are 1.253*10²⁴ particles in 2.080 moles
Explanation:
Avogadro's number is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole. In other words, Avogadro's number is the number of molecules that one mole of any substance contains. Its value is 6.023 * 10²³ particles per mole.
So, you can apply a rule of three as follows: if 1 mole has 6.023*10²³ particles, then 2.080 moles, how many particles does it have?
[tex]amount of particles=\frac{2.080 moles*6.023*10^{23}particles }{1 mole}[/tex]
amount of particles= 1.253*10²⁴ particles
There are 1.253*10²⁴ particles in 2.080 moles
when a scientist shares her findings with other scientists she is
Answer:
communicating results
Explanation:
Answer:
Communicating results
Explanation:
During what part of the experiment is the hypothesis "judged" as being rejected or supported?
Answer:
null
Explanation:
the hypothesis is a typical statistical theory which suggest that no statistical relationship and significance exists in a set of a given single observed variable between two sets of the observed data and measured phenomena
What is the mass of a 12.31 cubic centimeter piece of copper having a density of 8.96 grams/ cubic centimeter?
m ≈ 110.30 grams
Explanation:d = m/V
m = d×V
m = 8.96g/cm³×12.31cm³
m = 110.2976
m ≈ 110.30 grams
Answer:
[tex]\Huge \boxed{\mathrm{110.2976 \ grams}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]\sf \displaystyle density = \frac{mass}{volume}[/tex]
[tex]\displaystyle \rho = \frac{m}{V}[/tex]
Solving for the mass.
[tex]m = \rho \cdot V[/tex]
The density of the copper piece is 8.96 g/cm³.
The volume of the copper piece is 12.31 cm³.
[tex]m = 8.96 \cdot 12.31[/tex]
[tex]m= 110.2976[/tex]
The mass of the copper piece is 110.2976 grams.
[tex]\rule[225]{225}{2}[/tex]
Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:
Answer:
Radioactive
Explanation:
They're more unstable than my home life
A change in matter that produces new substances is called a _____. 1.mixture 2.physical change 3.solution 4.chemical change
Answer:
Chemical Change
Explanation:
chemical bonds within the substance have been altered because a new substance has been produced. It cannot be a mixture because they do not involve changes in matter, it cannot be a physical change because they do not result in new substances, it is not a solution because those do not involve changes in matter.
Select the correct answer. A student places a 12-gram cube of ice inside a container. After six hours, the student returns to observe the contents of the container. Which sentence suggests that the container is an open system? A. The container contains 12 grams of liquid water and no ice. B. The container contains 12 grams of ice and no liquid water. C. The container contains 8 grams of liquid water and no ice. D. The container contains 8 grams of ice and 4 grams of liquid water. E. The container contains 8 grams of liquid water and 4 grams of water vapor.
Answer:
b
Explanation:
which two conditions can limit the usefulness of the kinetic-molecular theory in describing gas behavior
13. when "doing science" using the scientific method, which of these would be at the top of the list? this is about science, lesson 5 unit 1 the scientific method, pl help me, I have a bad grade an I want to get this right, this assignment is worth 68 eight points for Connexus.
Answer:
make an observation
Explanation:
Answer:
OBSERVING AND QUESTIONING
Explanation:
when you use the scienfic method the first thing you have to do is question you theory and coming up with a hypothesis which is what you expect to happen
What is the formula for ammonium carbonite? How did you get it?
Answer:
(NH4)2CO3 is the formula !
Answer:
[tex](NH_4)_2CO_3[/tex]
Explanation:
Ammonium carbonate is made by reacting ammonium sulfate, ammonium chloride, and calcium carbonate in a furnace.
A graduated cylinder contains 20.0 mL of water. After a rock is placed in the cylinder, the level rises as shown below. What is the volume of the rock?
Answer:
The correct answer is 14 cm³.
Explanation:
Based on Archimedes Principle at rest when a body is completely or partially immersed within a fluid, it encounters a vertical thrust, which is equivalent to the weight of the fluid that the body displaces. In the mentioned case, the fluid is water. Thus, the rock being denser will result in the displacement of water, making the level of water to ascend in the cylinder.
Thus, if V₁ or the initial volume is 20 ml or 20 cm³, and after insertion of the rock, the rise in the level of water becomes V₂ as 34 ml or 34 cm³. Then the volume of the rock will be,
V = V₂ -V₁ = 34 - 20 = 14 cm³.
How do I obtain nitrogen from a mixture of nitrogen and oxygen?
Explanation:
about 78 % of the air is nitrogen and 21% is oxygen . These two gases can be seperated by fractional distillated of liquid air . Air is filtered to remove dust ,and then cooled in states until it reaches -200'C at this tempereture it is liquid . The air has been liquefied. And after a distillation process you can obtain nitrogen from a mixture of nitrogen and oxygen .
which of the following is true about matter
a. it has more mass and takes up space
b. it is always a substance
c. it has mass and is usually a liquid
d. it is a solid that takes up space
Answer: b- it is always a substance
Explanation: matter can be any liquid, gas, or solid that takes up space so the answer cannot be C or D. For answer number A to be true, you would have to remove the word more, because matter just has mass and takes up space it does not have "more mass"
During ionization, water molecules disrupt the ionic bonds of a salt to produce a mixture of ions. These ions can carry a current and so are called
Answer:
Electrolytes
Explanation:
Electrolytes are minerals in your body and balance the amount of water in your body. In this case, it balances the water from the salt by producing a mixture of ions.
Electrolytes are the ions formed when water molecules shatter the ionic bonds of a salt and can conduct an electric current.
Electrolytes are compounds that create ions and may conduct electric current when dissolved in water or melted. These ions may carry electric charges and let electrical energy flow through a solution or molten solid.
Electrolytes are compounds that breakdown into ions when dissolved in water or melted. The presence of these ions permits electricity to pass through the solution or molten material.
Thus, electrolytes are classified as either strong, which entirely breakdown into ions, or weak, which only partially dissociate. Salts, acids, and bases are examples of common electrolytes.
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name two noble gasses
Answer:
The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
Explanation:
what is the symbol of mercury
Answer: Hg
Explanation:
The symbol of Mercury is Hg drived from Hydra gayrum
How do you separate alcohol and water ?
Answer:
liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.
Explanation:
hope this helps :3
05. When a gold pebble is placed in a graduated cylinder that contains 12.0 mL of water, the water level rises
to 19.4 ml. What is the mass of the gold pebble? [The density of gold is 19.3 g/cm]
Answer:
142.82 g
Explanation:
The following data were obtained from the question:
Volume of water = 12 mL
Volume of water + gold = 19.4 mL
Density of gol= 19.3 g/cm³
Mass of gold =.?
Next, we shall determine the volume of the gold. This can be obtained as follow:
Volume of water = 12 mL
Volume of water + gold = 19.4 mL
Volume of gold =.?
Volume of gold = (Volume of water + gold) – (Volume of water)
Volume of gold = 19.4 – 12
Volume of gold = 7.4 mL
Finally, we shall determine the mass of the gold as follow:
Note: 1 mL is equivalent to 1 cm³
Volume of gold = 7.4 mL
Density of gol= 19.3 g/cm³ = 19.3 g/mL
Mass of gold =?
Density = mass /volume
19.3 = mass of gold /7.4
Cross multiply
Mass of gold = 19.3 × 7.4
Mass of gold = 142.82 g
Therefore, the mass of the gold pebble is 142.82 g
Which of the following is a physical property ? A. Being black in color B. A toxic acid C. burning with oxygen D. Releasing SO2 gas
Answer:
A. Being black in color
Explanation:
Physical properties are properties that can be observed without having to change the chemical composition of the substance.
So, an observation about the color of the object would be physical.
Therefore, A is correct because there are no chemical changes involved, while the other 3 answer choices involve some type of chemical change.
Answer:
Being black in color.
Explanation:
It is something you can see with one of your 5 senses.
Which contributes to the lack of evidence of the Period of Heavy
Bombardment on Earth?
The correct answer to this would be:
Earth’s volcanoes
Together with weathering and plate tectonic movements, Earth’s volcanic eruptions and emission of lava has destroyed/covered many of the craters which were created on Earth during the Period of Heavy Bombardment.
IamSugarBee
The correct answer to this would be letter:
A. Earth’s volcanoes
Together with weathering and plate tectonic movements, Earth’s volcanic eruptions and emission of lava has destroyed/covered many of the craters which were created on Earth during the Period of Heavy Bombardment.
Do the following problem using significant figures.
4.5 cm x 2000.0 cm x 4 cm =
I
cm^3
Given :
Measurements [tex]4.5\ cm\times 2000.0\ cm\times 4\ cm[/tex] .
To Find :
The multiplication using significant figures .
Solution :
We know , the least number of significant figures in any number of the problem determines the number of significant figures in the answer.
So , significant figure( S.F) in 4.5 cm is 2 .
S.F in 2000.0 cm is 5 .
S.F in 4 cm is 1 .
So , minimum S.F is 1 .
Therefore , S.F of their product is 1 .
Now , multiplying them we will get :
[tex]M=4.5\times 2000.0\times 4 \ cm^3\\\\M=36000\ cm^3[/tex]
Now , converting 36000 in 1 significant digit .
First we will write it in exponential 2 S.F form.
[tex]3.6\times 10^4 \ cm^3[/tex]
Now , to convert 3.6 into 1 S.F we should round off this .
So , round off 3.6 we will get 4 .
Therefore , The multiplication using significant figures is [tex]4\times 10^4\ cm^3[/tex] .
Hence , this is the required solution .
True or false 1. A scientific model is representation of a particular phenomena
using something to make it easier to understand.
Answer:
True
Explanation:
The given statement is true.
A scientific model is defined as the mathematical and physical representation of a process or event. Scientists perform several observations or experiment and find a connection between them to prove a scientific finding.
A scientific model has the ability of explanatory power which helps to make things easier to understand using diagrams and consistency across contexts. Testing and prediction power in scientific models leads to strong predictions and able to convince people using an appropriate model.
Hence, the correct answer is "true".
3. In which reaction is the volume of the products equal to the volume of the
reactants?
A 2H2(g) + O2(g) → 2H2O(g)
B 3H2(g) + N2(g) → 2NH3(g)
C N2(g) + O2(g) → 2NO(g)
D 2502(g) + O2(g) → 2503(g)
Answer:A
Explanation:
Please help me!!! I have like ten minutes left to submit my homework in
A student knows that the sublimation point of carbon dioxide (CO ) is -78.5°C. That is, at this temperature, solid carbon dioxide will change state directly from a solid to a gas. The student is asked to predict the temperature at which gaseous carbon dioxide will change directly from a gas to a solid. Which prediction will be supported by experimental evidence?
Answer:
See explanation
Explanation:
Even though the options were not stated in the question, it is clear that the prediction required must reflect the stated fact that the sublimation temperature of CO2 is -78.5°C. This is the fact that was observed in the cause of the experiment. Hence any of the options that reflects this statement must be the correct option among the list of options available in the question.
Which of the following lab tools is used to measure liquid volume?
A) triple beam balance
B) ruler
C) beaker
D) Test tube
What is the difference between ions and isotopes?
Can someone answer this please thank you ! Need it ASAP !
How can you describe the scientific method
Is cough syrup compound or a mixture?
Answer:
Compound
Explanation:
Consisting mostly of sugar dissolved in water (corn syrup), and having the same concentration of solute throughout, it would be classified as homogeneous. Are compounds heterogeneous or homogeneous?
Cough syrup is a mixture as more than one compound is used in it. It is a homogenous mixture.
What is a mixture?A mixture is a material made up of two or more different chemical substances which are not chemically bonded. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
A mixture can be homogenous mixture or heterogenous mixture. Homogenous mixture is a mixture in which there are more that one components but we can't distinghuish them with our eye whereas heterogenous mixture is a mixture in which there are more that one components and we can distinghuish them with our eye.
Traditional cough mixtures are formulated around a syrup at 60 - 75% concentration which is made from sucrose, maltodextrin, glucose, invert syrup, etc. The remainder is made up of thickening agents, stabilizers and active ingredients.
Therefore, Cough syrup is a mixture as more than one compound is used in it. It is a homogenous mixture.
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Q3: What fundamental unit of the metric system always has a prefix in front of Write your answer here
Answer:
prefix kilo
Explanation:
Hope this helps.......
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide? (5 points)
Oa
Carbon and oxygen are chemically bonded in it.
Oь
Carbon and oxygen retain their original identity in it.
It can be separated into carbon and oxygen using physical methods.
Od
The proportion of carbon and oxygen is different in different samples of the gas.
Answer:
The proportion of carbon and oxygen is different in different samples of the gas.
How many microliters are in 0.68 liters? 
There are 680,000 microliters in 0.68 liters.