Answer:
B. use a new pair of gloves for each piece of evidence
Explanation:
When it comes to the basic precautions of handling biological evidence samples, one has to prevent cross contamination. This refers to the transfer of DNA from one evidence to another evidence; thus, it is important for Jane to use a new pair of gloves for each piece of evidence in order to prevent such occurrence.
Wearing of gloves will also prevent Jane's DNA from being implanted into the sample, and it will keep her safe from contracting blood-borne pathogens like those in the saliva, blood or semen.
True of False: The "North" end of a Magnet will be repelled by another "North" end of a magnet
Answer:
True
Explanation:
Opposite attract when talking about magnets
Answer:
True.
Explanation:
Opposites attract. The two same forces of the north ends repel each other.
The conversion factor 1 mol/6.02 × 1023 representative particles can be used to find the number of moles when the number of representative particles is known
true or false
NEED HELP ASAP
Identify the type of reation. 2 NO2 ----> 202 + N2
A)
Synthesis
B)
Decomposition
C)
Single Replacement
D)
Double Replacement
Answer:
B) Decomposition
Explanation:
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Chemical equation:
2NO₂ → 2O₂ + N₂
The given reaction is decomposition reaction. NO₂ decomposed to give nitrogen and oxygen. All other options are incorrect because,
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AC +BD
Which landform explains the lack of cultural interaction between ancient China and ancient India? (4 points)
the Loess Plateau
the Chang River valley
the Gobi Desert
the Himalaya Mountains
Answer:
I had this question and it was the 4th one for me
Explanation:
+30 points
Answer right away!!
I will add a brainiest answer
Describe what happens to the air in a cold front
Be descriptive
Answer:
where a cold air mass is replacing a warmer air mass. ... The air behind a cold front is noticeably colder and drier than the air ahead of it. When a cold front passes through, temperatures can drop more than 15 degrees within the first hour.
Explanation:
The effects from a cold front can last from hours to days. The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools. As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.
most matter does what when heated
Answer:
Expands
Explanation:
I don't know if that's an option but i hope it helps.
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
Why are a molecule's atoms as far away from each other as they can get?
A. Forces between electron pairs push the atoms apart.
B. Induced dipoles push the atoms away from each other.
C. Electronegativity differences force the atoms apart.
D. The protons in the nuclei push the atoms apart.
Answer: A
Explanation:
Because I just answered it and it’s right. ( Forces between electron pairs push the atoms apart.
How could you improve the accuracy of your measurements?
Explanation:
Accuracy is the nearness of observed values or measured values to the true value.
The difference between the measured and observed value gives the error incurred during the experimental procedure.
Here are some ways to improve the accuracy of measurements;
Use the right instrument to make recordings and to take measurements. Employ the right hands and improve your technical knowledge. Be very careful and observant while making measurement. Ensure the instruments are properly calibrated. Make sure the experiment follows the right design.To make a 7.21M solution, how many moles of solute will be needed if 12.0 liters of solution is required? (Stoichiometry)
Answer:
I think it's 78. I might be wrong I'm not sure.
Explanation:
When we combine two simpler substances into a more complex one, it is known as a reaction.
Answer:
It would be known as a chemical reaction or a chemical compound.
Can someone please help me with this? This is due today, please please help me!
ATOMIC NUMBER: It is the number of protons present in the nucleus of every atom
MASS NUMBER: It is the number of nucleon. Nucleon are the number of proton and neutrons present in the nucleus.
PROTON NUMBER: Proton number equal to the atomic number.
ELECTRON NUMBER: Electron Number is equal to the atomic number.
NEUTRON NUMBER: It is Mass Number - Atomic Number.
CHARGE: It is due to the addition or removal of the electron. + charge when electron removed and - charge when electron is added.
SYMBOL: It is represented as,
[tex]X^Z_A[/tex]
Z is Mass Number
A is Atomic Number
_____________________________________Worksheet:(I) ATOMIC NUMBER: 17
MASS NUMBER: 35.5
PROTON NUMBER: 17
ELECTRON NUMBER: 17
NEUTRON NUMBER: 18.5
CHARGE: 0
_____________________________________(II) ATOMIC NUMBER: 71
MASS NUMBER: 180
PROTON NUMBER: 71
ELECTRON NUMBER: 71
NEUTRON NUMBER: 109
CHARGE: 0
_____________________________________(III) ATOMIC NUMBER: 40
MASS NUMBER: 86
PROTON NUMBER: 40
ELECTRON NUMBER: 38
NEUTRON NUMBER: 46
CHARGE: +2
_____________________________________(IV) ATOMIC NUMBER: 92
MASS NUMBER: 238
PROTON NUMBER: 92
ELECTRON NUMBER: 86
NEUTRON NUMBER: 146
CHARGE: +6
_____________________________________(V) ATOMIC NUMBER: 82
MASS NUMBER: 206
PROTON NUMBER: 82
ELECTRON NUMBER: 78
NEUTRON NUMBER: 124
CHARGE: +4
_____________________________________(VI) ATOMIC NUMBER: 34
MASS NUMBER: 79
PROTON NUMBER: 34
ELECTRON NUMBER: 36
NEUTRON NUMBER: 45
CHARGE: -2
_____________________________________(VII) ATOMIC NUMBER: 48
MASS NUMBER: 113
PROTON NUMBER: 48
ELECTRON NUMBER: 49
NEUTRON NUMBER: 65
CHARGE: -1
_____________________________________(VIII) ATOMIC NUMBER: 21
MASS NUMBER: 42
PROTON NUMBER: 21
ELECTRON NUMBER: 21
NEUTRON NUMBER: 21
CHARGE: 0
_____________________________________(IX) ATOMIC NUMBER:
MASS NUMBER:
PROTON NUMBER:
ELECTRON NUMBER:
NEUTRON NUMBER:
CHARGE:
_____________________________________(X) ATOMIC NUMBER: 83
MASS NUMBER: 209
PROTON NUMBER: 83
ELECTRON NUMBER: 80
NEUTRON NUMBER: 126
CHARGE: +3
_____________________________________(XI) ATOMIC NUMBER: 47
MASS NUMBER: 108
PROTON NUMBER: 47
ELECTRON NUMBER: 47
NEUTRON NUMBER: 61
CHARGE: 0
_____________________________________(XII) ATOMIC NUMBER: 49
MASS NUMBER: 116
PROTON NUMBER: 49
ELECTRON NUMBER: 46
NEUTRON NUMBER: 67
CHARGE: +3
_____________________________________(XIII) ATOMIC NUMBER: 53
MASS NUMBER: 128
PROTON NUMBER: 53
ELECTRON NUMBER: 54
NEUTRON NUMBER: 75
CHARGE: -1
_____________________________________(XIV) ATOMIC NUMBER: 76
MASS NUMBER: 188
PROTON NUMBER: 76
ELECTRON NUMBER: 72
NEUTRON NUMBER: 112
CHARGE: +4
_____________________________________Best Regards,'Borz'n element has FOUR known isotopes with the following atomic masses and percentage of occurrence: 47.688 amu; 15.778% 44.000 amu; 39.687% 43.557 amu; 24.500% 42.609 amu; 20.035% What is the average atomic mass of this element? Group of answer choices
how are pigments and dyes different in terms of their chemical components?
Answer:
Pigments themselves are actual particles of color. ... In terms of their chemical composition, one primary distinction between dyes and pigments is that pigments are insoluble in water as well as most other solvents. In general, dyes are either water soluble or soluble in another type of solvent.
Explanation:
If all the gas in container A is transferred to a small container, B, with no change in temperature, the pressure in container B will ______.
A. increase
B. decrease
C. not change
D. become equal to the outside air pressure
Taking into account the Boyle's law, the correct answer is option A.) If all the gas in container A is transferred to a small container, B, with no change in temperature, the pressure in container B will increase.
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature, and moles.
As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls.
In this way pressure and volume are related, determining Boyle's law (on of the gas laws) which says:
"The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"
That is, if the pressure increases, the volume decreases; whereas if the pressure decreases, the volume increases.
In summary, the correct answer is option A.) If all the gas in container A is transferred to a small container, B, with no change in temperature, the pressure in container B will increase.
Learn more:
https://brainly.com/question/4147359?referrer=searchResultsPlease help! This is 8th grade science btw
Answer:
hacfgdeibjExplanation:
Hope this Helps!
:D
A student carefully placed 18.1 g of sodium in a reactor supplied with an excess quantity of chlorine gas. When the reaction was complete, the student obtained 39.6 g of sodium chloride. How many grams of chlorine gas reacted?
Answer:
The mass of chlorine gas that reacted ≅ 24.03 g
Explanation:
From the given information:
The number of moles of NaCl formed = mass of NaCl/molar mass
mass of NaCl = 39.6 g
molar mass = (23 + 35.5) g/mol = 58.5 g/mol
∴
The number of moles of NaCl formed = 39.6 g / 58.5 g/mol
The number of moles of NaCl formed = 0.6769 g/mol
Thus, the mass of chlorine gad that reacted = 0.6769 × 35.5
The mass of chlorine gas that reacted = 24.02995 g
The mass of chlorine gas that reacted ≅ 24.03 g
PLEASE HELP
Which of the following shows the kinetic form of mechanical energy?
A. Pedaling a bicycle
B. Holding a basketball
C. Lying on the ground
D. Watching television
Answer: A. Pedaling a bicycle
Explanation: i also have the same question too and im in 5th grade
ANSWER FOR BRAINLYEST
What principle is used in the above diagram to calculate the amount of carbon dioxide that s absorbed by laIId?
OA.
OB.
Oc.
OD.
the law of consevation of mass
the law of universal gravitation
cell theory
atomic theory
Which of these statements describes this mathematical equation?
P1v1/t1=k
The final pressure of a gas is directly proportional to volume and temperature change.
The final pressure of a gas is directly proportional to volume change and Inversely proportional to temperature che
The final pressure of a gas is inversely proportional to the volume change and directly proportional to temperature
none of the above
Answer:
The final pressure of a gas is inversely proportional to the volume change and directly proportional to temperature
Explanation:
Given
[tex]\frac{P_1V_1}{T_1} = k[/tex]
Required
Interpret
[tex]\frac{P_1V_1}{T_1} = k[/tex]
Multiply both sides by T1
[tex]T_1 * \frac{P_1V_1}{T_1} = k * T_1[/tex]
[tex]P_1V_1 = kT_1[/tex]
Divide both sides by V1
[tex]\frac{P_1V_1}{V_1} = \frac{kT_1}{V_1}[/tex]
[tex]P_1 = \frac{kT_1}{V_1}[/tex]
This can be rewritten as:
[tex]P_1 = k\frac{T_1}{V_1}[/tex]
In the above expression; k is a constant of proportionality.
So, the equation can be written as variation as follows:
[tex]P_1\ \alpha\ \ \frac{T_1}{V_1}[/tex]
To interpret:
P varies directly to T (the numerator) and inversely to V (the denominator).
does sound have color? why do you have this opinion (base your answer on wavelengths)
Answer:
Yep. Many of the sounds we associate with white noise are actually pink noise, or brown, or green, or blue. In audio engineering, there's a whole rainbow of noise colors, each with its own unique properties, that are used to produce music, help relaxation, and describe natural rhythms like the human heartbeat.
Explanation:
can you slap me 360°
Answer:
yes and no, it is possible, but im here and you and be any where in the world.
Explanation:
hope it helps
Answer: Yes, it’s possible if you don’t cry like a baby banana and say ouch !!
Explanation:
How many grams are in 39 moles of ammonium chloride? (Round to the nearest
whole number) Do NOT add units, enter numbers only!
Type your answer...
Answer:
468
Explanation:
SEP Use Models Why does the number of electrons in each principal energy shell increase as the number of the shell increases?
Answer:
See explanation
Explanation:
The number of electrons in each principal energy shell increases as the number of shells increases because more electronic orbitals become available to accommodate the electrons.
For instance, the n= 2 level only accommodates eight electrons in the s and p orbitals whereas the n=3 level accommodates 18 electrons in s, p and d orbitals respectively.
Each principal level accommodates 2n^2 electrons where n= the principal energy shell.
The increase in the number of shell leads to increase in the number of electrons.
The number of electrons in each principal energy shell increase as the number of the shell increases because each cell can accommodate 8 electrons except the first shell which has only 2 electrons. The number of electrons increases when we go down the group due to addition of new shells.
The atom added new shells in the atom if the existing shells fill with electrons and no place is available for the remaining electrons so we can conclude that the increase in the number of shell leads to increase in the number of electrons.
Learn more: https://brainly.com/question/19756408
what does this graph represent?
Answer:Potential and kinetic energy
Explanation:
What letter or pair of letters that represent the
element.
How many moles of Helium would be equal to 55 liters of helium?
Answer:
Solution: 3.78 L He. 22.4 L. 1 mol. = 0.169 mol He.
Explanation:
Answer:
3.78 liters
Explanation:
If a balloon is filled with 3.78 L of He gas is at STP.
Which of the following is an element?
A
MgBr
B
HCl
C
O
D
Cu(SO4)3
Oxygen is a chemical element with symbol O and atomic number 8. Classified as a nonmetal, Oxygen is a gas at room temperature.
Question 8 of 10 Which wave property is related to the pitch of a sound? A. Crest height B. Frequency O C. Amplitude D. Rest position
Answer:
frequency
Explanation:
i took the test
Lipase is an enzyme that breaks down the fat in food molecules into smaller molecules. Which of the following best describes the function of lipase?
