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.
A 20 kg curling stone is sliding in a positive direction at 4 m/s. A second curling stone is sliding at the same speed but in the opposite direction. What is the kinetic energy of the two stones?
Answer:
The kinetic energy of the two stones is 320 J
Explanation:
Kinetic energy is the energy that a body possesses due to its movement. So it is the capacity or work that allows an object to go from being at rest, or still, to moving at a certain speed.
In other words, the kinetic energy of an object is that which is produced due to its motion and depends on its mass and velocity as follows:
[tex]Ec=\frac{1}{2} *m*v^{2}[/tex]
where the kinetic energy Ec is measured in joules (J), the mass m is measured in kilograms (kg) and the velocity v in meters/second (m/s).
In this case you know that a 20 kg curling stone is sliding in a positive direction at 4 m/s. So:
m= 20 kgv= 4 m/sReplacing you have:
[tex]Ec_{1} =\frac{1}{2} *20 kg*(4\frac{m}{s}) ^{2}[/tex]
Ec₁= 160 J
A second curling stone slides at the same speed but in the opposite direction. So:
m= 20 kgv= - 4 m/sReplacing you have:
[tex]Ec_{2} =\frac{1}{2} *20 kg*(-4\frac{m}{s}) ^{2}[/tex]
Ec₂= 160 J
The kinetic energy of the two stones is calculated as:
Ec= Ec₁ + Ec₂
Ec= 160 J + 160 J
Ec= 320 J
The kinetic energy of the two stones is 320 J
How does the control group differ from the experimental group? Choose all the correct options.
A The control group contains more than one experimental variable
B
The control group is used as a standard to compare results to, but the experimental group is not
c The experimental group is used as a standard to compare results to, but the control group is not
D The control group is not tested or measured
E The control group does not contain the experimental variable, but the experimental group does.
F The control group does contain the experimental variable, but the experimental group does not
Answer:
B,D,E
Explanation:
does anyone know the answeres
Convert 30°C into kelvin
Answer:303.15
Explanation:
Use your knowledge of atomic calculations to complete the chart.
Element
Protons
Neutrons
Electrons
Atomic
Number
3
15
Atomic
Mass
7
31
35
19
28
31
P
ci
Ni
K
Ag
H
39
19
-18
47
OK
1
1
14
14
06
3
Si
w
74
1010
Ne
10
10
Answer:
For hydrogen. H
Explanation:
Atomic number is 1
Proton number is 1
Mass number is 2
Neutron number is 1
Suppose you set a glass of water in direct sunlight for 2 hours and measure its temperature every 10 min . What type of graph would you use to display your data .
HELP ASAP PLS
Answer:
line graph
Explanation:
The type of graph would be used to display the data is line graph.
What is graph?Graph is defined as a visual representation, such as a picture or diagram, that shows information or values in a structured way. The graph's goal is to visually represent numerical data so that it can be quickly, simply, and clearly understood. As a result, graphs are visual displays of data.
Although a graphical display is easier to understand, data can also be presented as a table. For this kind of data, a line graph will be used. This will show more clearly how the temperature of the water fluctuates over the course of two hours. Time is an independent variable, whereas temperature is a dependent variable.
Thus, the type of graph would be used to display the data is line graph.
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If you dissolve 5.00 kg of methanol (CH_4O) in 2.00 m^3 of water, how many molecules of methanol per liter of water do you have? (1 kg = 1000 g; 1 m^3 = 1000 L)
Given :
Mass of methanol ( [tex]CH_3OH[/tex] ) , m = 5 kg = 5000 g .
Volume of water , [tex]V=2\ m^3=2000\ L[/tex] .
To Find :
Molecules of methanol per liter of water .
Solution :
Moles of methanol , [tex]n=\dfrac{5000}{32}=156.25\ mol[/tex] .
We know , 1 mole of a substance contains [tex]6.022\times 10^{23}\ mol^{-1}[/tex] .
So , total number of molecules :
[tex]M=156.25\times 6.022\times 10^{23}\\\\M=9.41\times 10^{25}[/tex]
Number of molecules per liter :
[tex]\dfrac{9.41\times 10^{25}}{2000}\\\\4.705\times 10^{22}[/tex]
Hence , this is the required solution .
Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCl(aq)⟶ZnCl2(aq)+H2(g) How many milliliters of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s)?
Answer:
41.17
Explanation:
n Zn = mass / m.wt
= 8.75 /(65.4) = 0.1338 mole
n HCL = ( from the balanced equation )
2HCL Zn
2mole → 1 mole
x mole → 0.1338mole
n HCL = .268 mole
M= mole/liter
6.50= 0.268/x
so u have0.04117 liter = 41.17 ml
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 41.17 ml of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s).
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of zinc= mass / molecular mass
= 8.75 /(65.4) = 0.1338 mole
number of moles of HCl ( from the balanced equation )
2 moles of HCl reacts with one mole of Zn
number of moles of HCl = 2×0.1338 =0.268 mole
Molarity = number of mole of HCl/volume occupied by solution
6.50= 0.268/volume
Volume of HCl = 41.17 ml
Therefore, 41.17 ml of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s).
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Summarize the process a scientist goes through to come up with a
satisfactory solution.
To calculate the charge of an atom you must
Answer:
The charge of an element is equal to the number of protons minus the number of electrons. The number of protons is equal to the atomic number of the element given in the periodic table. The number of electrons is equal to the atomic number minus the charge of the atom.
Explanation:
Which process is an example of a chemical change? drying clothes in the dryer heating a cup of tea chopping a tree activating a glow stick
why can't a beaker be used to measuring the volume of a liquid
Answer:
It doesn't have measure marks on it.
Element X has 3 naturally occurring isotopes. The first isotope has an atomic mass of 28.0 amu and a natural abundance of 14.0%. The second isotope has an atomic mass of 29.0 amu and a natural abundance of 66.0%. The third isotope has an atomic mass of 27.4 amu and a natural abundance of 20.0%. What is the atomic mass of element X?
a-27.1 amu
b-28.5 amu
c-28.9 amu
d-29.1 amu
Answer:
Option B. 28.5 amu
Explanation:
The following data were obtained from the question:
Isotope A:
Mass of A = 28.0 amu
Abundance (A%) = 14.0%
Isotope B:
Mass of B = 29.0 amu
Abundance (B%) = 66.0%
Isotope C:
Mass of C = 27.4 amu
Abundance (C%) = 20.0%
Atomic mass of element X =.?
The atomic mass of element X can be obtained by using the following formula:
Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
Atomic mass of Element X = [(28 × 14)/100] + [(29 × 66)/100] + [(27.4 × 20)/100]
= 3.92 + 19.14 + 5.48
= 28.54 ≈ 28.5 amu
Therefore, the atomic mass of Element X is 28.5 amu
Is beans in water a suspension colloid or solution
Answer:
The CORRECT answer is Solution
Explanation:
Since a Colloid is a liquid like substance that cannot be removed from other solids the only possible choice would be a Solution. becuase with a solution you can drain the solution and still get the beans.
What is the SI unit for mass
Answer:
kilo gram
Explanation:
kilogram(kg)
Answer:
Kilogram (Kg).......
⁴₁₂Mg and ²⁴₁₂Mg⁺² can be defined as
isotopes
different elements
ions
average atomic masses
ions because it’s still the same element, however the charge has changed
PLS I NEED HELP give me examples of an atom
Answer:
Neon (Ne)
Hydrogen (H)
Argon (Ar)
Iron (Fe)
Calcium (Ca)
Deuterium, an isotope of hydrogen that has one proton and one neutron.
Plutonium (Pu)
F-, a fluorine anion.
Explanation:
I got u
What’s the first thing you should always do before starting a lab
Review your instructions
How could contaminants from your community affect a river basin that is miles away?
contaminants from your community can flow through runoff into a river basin.
Contaminants from your community affect a river basin that is miles away could runoff can carry pollutants from your neighborhood into a river basin.
What is community?Community is defined as a social community that shares characteristics like geography, rules, beliefs, values, or identities. Community is important because they are frequently a significant source of social connection and a sense of belonging, strong communities are essential. Living a fulfilling life requires being a part of a group of people who share similar attitudes, values, and aspirations.
Contaminants are defined as a substance that, whether unintentionally or on purpose introduced to air, water, soil, or food, becomes detrimental to humans or other living things on a biological, chemical, physical, or radiological level. Chemical, physical, and biological pollution are the three different types.
Thus, contaminants from your community affect a river basin that is miles away could runoff can carry pollutants from your neighborhood into a river basin.
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What should be the very last function performed in the lab before you leave?
a) Bid the instructor farewell
b) Make sure that your locker is secure
c) Wash your hands
d) Arrange a time with your lab partner for lunch
Answer:
c) Wash your hands
Explanation:
A laboratory or most popularly called as lab is a place or facility which provides controlled conditions where some educational research, scientific studies, experiments, testings, can be performed. The place is equipped with sophisticated machines, test samples, hazardous chemicals, instruments etc.
The university or college lab, there is a incharge of the lab called as the lab instructor who is responsible for all the belongings of the lab and the safety of the experimenter or the students.
After performing some experiments or testing with some chemicals, the last and the most important thing we need to do is to wash our hand with soap or hand wash. it is very important because we touch many test samples and hazardous chemical which might go inside our mouth or eyes accidentally, which might be harmful to us.
So, it is important to wash our hand at last before leaving the lab.
How might newtons second law relate to an asteriood that is heading toward earth
Answer:
it might be able to get a heading to a earth
1. Which number is more accurate if the correct number is 3.5. Is it 3.1, 3.3, 3.6, or 4.0?
Answer:
3.6
Explanation:
3.6 is only 0.1 away from 3.5
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What happens when two positively charged particles are close together? A. They repel each other.
B. They cancel each other.
C. They attract each other.
D. They have no effect on each other.
Answer:
A is the ans
Explanation:
they repel each
If a block has the mass of 15.00 grams and measurements of 5.00cm by 3.00cm by 2.00cm what is the volume of the block?
Answer:
Volume = 30cm³
Explanation:
A block is a geometrical figure and its volume, -look at the figure-, follows the equation:
Volume = Width*Length*Height
As the measurements of the block are 5.00cm, 3.00cm and 2.00cm, the volume is:
Volume = 5.00cm*2.00cm*3.00cm
Volume = 30cm³What is the charge of a chromium ion that has lost 4 electrons?
Answer:
Explanation:
When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons. In the opposite case when an atom gains electron(s) it becomes negatively charged (more electrons than protons)
and plzs do not hate
The charge of chromium after losing 4 electrons is +2.
What is the ionic charge?
Ions are two or more charged particles that make up ionic compounds. Electrostatic attraction keeps the ions together (in the solid phase) despite their opposing charges. Cations are positively charged ions, whereas anions are negatively charged ions. Many factors make ionic molecules significant.
They act as electrolytes for batteries and conduct electricity when dissolved in water. They could form a strong bond with other charged particles, such as those found in environmental samples or the human body. They find use in fireworks, flares, and lights because they are frequently multicolored when burned. The list is endless!
Studying the nomenclature used to give ionic compounds distinctive names is a good method to become familiar with and exposed to them. You will learn how to properly explain the identification of substances in language by converting from a chemical formula to a name—a highly essential problem as the diversity and complexity of known compounds keeps growing!
Therefore, the charge on chromium after losing 4 electrons is +2.
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Which acid
is synthetic and not found in
nature?
Answer:
because acids come from various chemical substances
Terry bought a gold necklace at a pawnshop and was wondering if it was “real” gold. She decided to perform a density test. She placed the necklace in a graduated cylinder of water that had 47.00 mL of water and the water rose to 48.35 mL. She then weighed the necklace and found it to have a mass of 22.89 g. What is the density of Terry’s necklace?
Answer:
d = 16.96 g/mL
Explanation:
Given that,
Initial water level in graduated cylinder is 47 mL and final water level is 48.35 mL.
The weight of the neclace is 22.89 g.\
We need to find the volume of the necklace. We know that, density equals mass per unit volume. So,
[tex]d=\dfrac{m}{V_f-V_i}\\\\d=\dfrac{22.89\ g}{(48.35-47)\ mL}\\\\d=16.96\ g/mL[/tex]'
Hence, the density of Terry’s necklace is 16.96 g/mL.
Answer:
A
Explanation:
The new mine means the supply is high and the price is low, so she can afford the necklace
plastics
shells
aluminum
cans
drift
wood
sea
weed
glass
This chart illustrates the type and number of items collected during a clean up of a
beach. Based on the chart, what approximate percentage of the total items result
from the action of people?
Describing Diffusion
What happens when molecules diffuse across the cell membrane?
The molecules diffuse until all of them are outside the cell.
The molecules move from areas of low concentration to high concentration.
The molecules move from areas of high concentration to low concentration.
The molecules diffuse until all of them are inside the cell.
Answer:
its the 3rd option.
the molecules move from region of higher concentration to a region of lower concentration.
Explanation:
please do give me brainliest if this helped you.
thank you and have a great day :D
Answer:
The molecules move from areas of high concentration to low concentration
Explanation:
6. An alloy of iron contains 75.0% iron and 25.0% other elements. How many grams of iron are present in 150. g of the alloy?
Answer:
108.5
Explanation:
half of 150 is 75 and half of that is 32.5. Add that to 75 and you'll get your answer
112.5 g of iron is present in the alloy.
From the question given above, the following data were obtained:
Percentage of iron (Fe) = 75%
Percentage of other elements = 25%
Mass of the alloy = 150 g
Mass of iron (Fe) =?The mass of the iron present in the alloy can be obtained as follow:
[tex]Percentage = \frac{mass of element }{total mass }\\\\[/tex]
75% = [tex]\frac{mass of Fe}{150}[/tex]
[tex]0.75 = \frac{mass of Fe}{150}\\\\[/tex]
Cross multiply
Mass of Fe = 0.75 × 150
Mass of Fe = 112.5 gTherefore, 112.5 g of iron is present in the alloy.
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