1. Which atom contains exactly 16 neutrons?
A S-33
B P-31
C O-16
D Cl – 35
2. In a mass spectrometer
A Particles with the most mass are deflected the most
B Particles with the least mass are deflected the most
C Particles with the least mass are deflected the least
D All particles are deflected the same
3. Calculate the mass, in grams, of 3.00 moles of carbon.
A 3.00 grams C
B 18.0 grams C
C 36.0 grams C
D 54.0 grams C
4. Calculate the number of moles of aluminum in 65 grams of aluminum?
A 2.4 moles Al
B 5.0 moles Al
C 850 moles Al
D 1800 moles Al
5. Calculate the number of atoms of sodium in a 4.5-gram sample.
A 1.2 x 1023 atoms Na
B 2.5 x 1023 atoms Na
C 1.7 x 10-22 atoms Na
D 3.1 x 1024 atoms Na
Answer:
1. B 2. B 3. C 4. A 5. A
Explanation:
1 Which atom contains exactly 16 neutrons?
Neutrons = Mass Number - Proton
A -33;
Neutrons = 33 - 16 = 17
B P-31
Neutrons = 31 - 15 = 16 Correct option
C O-16
Neutrons = 16 - 8 = 8
D Cl – 35
Neutrons = 35 - 17 = 18
2. In a mass spectrometer, the heaviest particles are least deflected and that with the least mass are deflected the most. The correct option is B.
3. 1 mol of C = 12 grams;
3 mol = x
x = 3 * 12 = 36 grams Correct option is C
4. 1 mol = 27g of Al;
x mol = 65g
x = 65 / 27 = 2.4 moles. Correct option is A.
5. There are 6.022 x 10^23 atoms in 23 grams of sodium;
x atoms in 4.5g
x = 6.022 x 10^23 * 4.5 / 23 = 1.2 x 10^23 atoms Correct option is option A.
If not for human activity how long would carbon stay as fossil fuel
Answer:
1,000 years
Explanation:
1,000 years
According to the U.N. Intergovernmental Panel on Climate Change (IPCC), which issued a special report on CCS in 2005, a properly selected site should securely store at least 99 percent of the sequestered CO2 for more than 1,000 years.
If the half-life of iodine-131 is 8.0 days, how much of a 100.0 mg sample of it will remain after 32 days? In case you're interested, iodine-131 forms xenon-131 by beta emission/decay. Please enter only a numerical answer and do not write in any units. It is understood that the unit is mg.
Given :
Half-life of Iodine , [tex]t_{0.5}=8 \ days[/tex] .
Initial concentration , [tex][A_o]=100\ mg[/tex] .
To Find :
The amount of sample remains after 32 days .
Solution :
Rate constant is given by :
[tex]k=\dfrac{0.693}{t_{0.5}}\\\\k=\dfrac{0.693}{8}\ s^{-1}\\\\k=0.086625\ s^{-1}[/tex]
Now , by rate law :
[tex][A]=[A_o]e^{-kt}[/tex]
Putting all given values, we get :
[tex][A]=100\times e^{-(0.086625)\times 32}\\[/tex]
[tex][A]=6.25\ mg[/tex]
Therefore , the remaining sample after 32 days is 6.25 mg .
Hence , this is the required solution .
An Olympic swimmer can swim a distance of 360m in 8.5 minutes. What is her speed?
Answer:
42.3529412 m/min or 0.705882353 m/s
Explanation:
We can calculate speed using the following formula.
[tex]s=\frac{d}{t}[/tex]
where [tex]d[/tex] is distance and [tex]t[/tex] is time.
The Olympic swimmer can swim 360 meters in 8.5 minutes. Therefore,
[tex]d= 360 \ m \\t= 8.5 \ min[/tex]
Substitute the values into the formula.
[tex]s=\frac{360 \ m}{ 8.5 \ min}[/tex]
Divide.
[tex]s= 42.3529412 \ m / min[/tex]
Her speed is 42.3529412 meters per minute.
If we want to find her speed in meters per second, convert the minutes to second.
1 minute is equal to 60 seconds, so we can multiply 8.5 by 60.
[tex]8.5 *60=510[/tex]
The swimmer can swim 360 meters in 510 seconds.
[tex]s=\frac{d}{t}[/tex]
[tex]d= 360 \ m \\t= 510 \ s[/tex]
[tex]s=\frac{360 \ m}{510 \ s}[/tex]
[tex]s=0.705882353 \ m/s[/tex]
Her speed is also 0.705882353 meters per second.
Need help with this
Answer:
environmentalism I think
Explanation:
...................
Answer:
2nd choice answer
Explanation:
thats ez tbh
How do electrons behave?
By using constants in an experiment, you can make sure that you are testing only one
A)experiment
B)variable
C)hypothesis
D)order
Which of the following has a negative charge? A.neutrino B.electron C.alpha particles D.gamma rays
Answer:
B. Electrons
Explanation:
Protons have a positive (+) charge.
Neutrons have a neutral (0) charge.
Electrons have a negative (-) charge.
Alpha Particles is a helium atom.
Gamma Rays are radiation.
Neutrino is Quantum Physics.
What is absolute zero? A) The temperature at which the particles of matter are at their lowest energy points. B) The temperature at which the particles of matter are at their highest energy points. C) Other _______________
Answer:
A) The temperature at which the particles of matter are at their lowest energy points.
Explanation:
Absolute temperature refers to the lowest possible temperature. At this state, no heat energy remains in the substance; the energy of the particles are at their lowest energy points.
49. Carry out the indicated temperature conversions.
40 °C to Fahrenheit degrees
b. -40 °F to Celsius degrees
c. 232 K to Celsius degrees
d. 232 K to Fahrenheit degrees
Answer:
sorry but dorks dont learn maths
Explanation:
just kidding no offense but i think umm 1st one will stay same
i searched google
i need help with this pls
Answer:
C Is The Correct Answer Because The Deeper The Rock Is The Older It Is So The Top Is The Youngest And The Bottem Is The Oldest
Which is one precaution to take when working with heat and fire?
O Do not use during experiments
O Keep flammables away.
O Avoid touching face and eyes.
O Do not mix chemicals unless told to do so.
Answer:
Keep flammables away
Explanation:
this would avoid anything catching on fire or burning down
During dialysis, water and urea pass from the blood into the dialysis fluid. Proteins stay in the blood.
(a) Name the process by which water passes from the blood to the dialysis fluid.
(b) Describe the process you have named in (a).
(c) Explain why water passes out of blood but proteins do not.
Answer:
Healthy kidneys clean your blood and remove extra fluid in the form of urine. They also make substances that keep your body healthy. Dialysis replaces some of these functions when your kidneys no longer work. There are two different types of dialysis - hemodialysis and peritoneal dialysis. The following is about hemodialysis.
Which is the electron configuration for boron? 1s22s3 1s22s23s1 1s12s22p2 1s22s22p1
Answer:
electron configuration for boron is 1s22s22p1
Answer:
D
(answer is D)
Bonnie wants to see if playing music to plants will help them grow taller. She buys 4 of the same kind of plant. They all receive the same amount of sun and water. She plays rap music to plant A, country music to plant B, rock music to plant C, and plant D gets no music at all. Everyday for a week she measures the height of each plant.
DO NOT HESITATE TP ASK FOR FURTHER EXPLANATION.
HOPE THAT HELPED.I need help with this please.
Matching
Match the word to the definition. Write the letter on the line.
6. Type Scientfic nquiry
А. This group shows the effect of the variable being tested
7. Type_ Hypothesis
В. This is the one variable that is changed
8. Type Control group
с. A welltested explanation for experimental results
9. Type Experimental group D. The many ways in which scientists study the natural world
10 Type Independent variable E A possible answer to a scientific question
11 Type Dependent variable F This describes an observed pattern in nature
12 Type Scientific theory G This group is left alone and not experimented on
Н This is the veriable that gets measured
13 Type Scientific law
Click to add speaker notes
Answer:
6. Scientific inquiry - D
7. Hypothesis - E
8. Control group - G
9. Experimental group - A
10. Independent variable - B
11. Dependent variable - H
12. Scientific theory - C
13. Scientific law - F
Explanation:
6. Scientific inquiry - D
Scientific inquiry is the study of the explanation for the natural world phenomenon and it requires many scientific steps.
7. Hypothesis - E
A hypothesis is a possible explanation for a phenomenon or problem. It is tested in order to see if true or not.
8. Control group - G
The control group in a scientific experiment is a group of subjects did not get the treatment and left alone.
9. Experimental group - A
The experimental group is another hand group of subjects that gets treatment and shows the effect of the variable being tested.
10. Independent variable - B
Independent variables change or manipulated during an experiment and cause a response from the dependent variable.
11. Dependent variable - H
The dependent variable is a variable that is dependent on independent variables and changes in the independent variable.
12. Scientific theory - C
A well-tested explanation for experimental results with the scientific process.
13. Scientific law - F
This describes an observed pattern in nature
true or false : when a theory has been known for a long time , it becomes a law
False.
It won’t become one if it’s not proven true.
How many significant figures does 0.857610 have?
Answer: 6
Explanation:
Because it's 6 after the decimal
A box has dimensions of 2.0 cm time 4.0 cm times 8.0 cm, what is the volume of the box in milliliters?
Answer:
64 mL.
Explanation:
From the question given above, the dimension of box is:
Dimension = 2 cm × 4 cm × 8 cm
Thus, the volume of the box is:
Volume = 2 cm × 4 cm × 8 cm
Volume = 64 cm³
Finally, we shall convert 64 cm³ to mL. This can be obtained as follow:
Recall:
1 cm³ = 1 mL
Therefore,
64 cm³ = 64 cm³ × 1 mL / 1 cm³
64 cm³ = 64 mL
Therefore, the volume of the box in millilitres (mL) is 64 mL.
A substance has a density of 3.56 g/mL and a mass of 5668 g. What is the volume?
Answer:
The answer is
1592.13 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} [/tex]
From the question
mass of substance = 5668 g
Density = 3.56 g/mL
The volume is
[tex]volume = \frac{5668}{3.56} \\ = 1592.1348314[/tex]
We have the final answer as
1592.13 mLHope this helps you
1. Measuring instruments, such as rulers and graduated cylinders, are often used in experiments to increase the A clarity of the hypothesis B. testability of the hypothesis C. accuracy of the data sample size of the data 5
Answer:
C. accuracy of the data sample size of the data
Explanation:
Measuring instruments, such as rulers and graduated cylinders, are often used in experiments to increase the accuracy of the data sample size which is usually gotten from the taken reading.
Measuring instruments such as rulers have accurate readings which makes measurements in any form very easy and more accuracy.
A recycling center must find a way to separate all of the aluminum cans from those made of nickel or iron. What would be a reliable, efficient way to separate them?
Answer:
Use a giant magnet to pick up the iron and nickel ones, leaving the aluminum behind.
Explanation:
Stay safe!
How many valence electrons does aluminum (AI) have available for bonding?
1
2
3
4
How did Edward Teller died?
Answer:
septembar 9 2003
Explanation:
he died in september 9 2003
Answer:
Your answer:
His cause of death was a stroke ( heart attack)
hope this helped you
please mark as the brainliest (ㆁωㆁ)
Which of these is an extensive ?
A- density
B- melting point
C- temp.
D- volume
There are 5 areas of chemistry:physical chemistry, organic chemistry, analytical chemistry, biochemistry and inorganic chemistry.identify which of the five area of chemistry best fits the action done by zoe, a chemist. zoe is using an instrument called a spectrophotometer to precisely determine the levels of various chemicals in a sample of drinking water.
If someone could help me I would really appreciate it. Thank you!
Answer:
Analytical chemistry
Explanation:
because in analytical chemistry checks that different chemicals in water,salt etc....
The most common isotope of chromium is 52Cr. How many neutrons does an atom of 52Cr have?
a. 24
b. 28
c. 52
d. 80
true or false
The atomic number of an element can be used to find the number of protons and neutrons in a neutral atom
Which is classified as an inner transition element?
a) calcium
b) copper
c) fermium
d) helium