Answer:
van Leeuwenhoek called the organisms he saw in his microscope "animalcules." also he shined light on specimen so that he could see the right cells
Plz help me with is thank you
Questions aren't clear, if u need assistance let me know .. I'm in year11 I can help out.
calculate the percentage by mass of oxygen in ammonium nitrate
Answer:
Percent composition of O is 48g80g×100%=60%
Which choice names part of the lithosphere?
-inner core
-outer core
-all of the mantle
-crust and outer part of the mantle
pls i give a brainest
Use the drop-down menus to complete the statements.
A segment of DNA is called a
.
A complex of nucleic acids and proteins that make up chromosomes is called
.
A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a
.
A segment of DNA is called a gene.
A complex of nucleic acids and proteins that make up chromosomes is called Chromatin
A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a chromosome.
Answer:
1. Gene
2. Chromatin
3. chromosome
Explanation:
I hope this helps you :)
Oxygen Molecules taken in per breath: The Athletes result will be?
Answer:
Explanation:
the answer is higher because there is more exercise that makes it higher
hope this helps
According to the rate law for the reaction, an increase in the concentration of hydronium ion has what effect on this reaction?
Answer:
The rate of reaction increases.
Explanation:
higher concentration --> more collisions --> rate increases
what chemical reaction type is Pb + 2 H3PO4 --> 3 H2 + Pb3(PO4)2
Answer:
single displacement reaction
Explanation:
it is because an atom(Pb) dispalces another atom(H) in H3PI4
The given chemical reaction is single displacement reaction.
What is single displacement reaction?When one element in a molecule gets replaced by another, is therefore called a single displacement reaction.
The given reaction is Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2
It can be seen that when lead is treated with H3PO4 then it will give Pb3(PO4)2 and hydrogen reaction. It is a kind of single displacement reaction.
Therefore, the given reaction is single displacement reaction.
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Under which conditions will sugar most likely dissolve fastest in a cup of water?
A. A sugar cube with stirring at 5°C
B. A sugar cube without stirring at 15°C
C. Sugar crystals with stirring at 15°C
D. Sugar crystals without stirring at 5°C
Answer:
The correct answer would be C
Explanation:
Plz correct me if wrong
The condition in which sugar is most likely to dissolve fastest in a cup of water is when sugar crystals with stirring at 15°C. Therefore, option C is correct.
What conditions are required for dissolution?Dissolution is the process by which a solute dissolves in a solvent to form a homogeneous mixture called a solution. The conditions required for dissolution are:
Agitation: The solute and solvent must be mixed together so that they come into contact with each other.Temperature: Increasing the temperature of the solvent increases the kinetic energy of its molecules, making it easier for the solute to dissolve.Pressure: Increasing the pressure of a gas above a liquid solvent can force more gas molecules into the solvent, increasing its solubility.Surface area: The rate of dissolution is directly proportional to the surface area of the solute particles exposed to the solvent. Polarity: A solute will dissolve in a solvent that has similar polarity.Thus, option C is correct.
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which of the two metal ions mg2+ and zn2+ is the most reactive why?
Answer:
Mg2+
Explanation:
The most reactive ions from the given choices is the magnesium ion. This is because it is higher in the activity series of metals.
Zinc ion is below this specie in the activity series.
As a rule, ions above another on the activity series are generally more reactive than those below.
From any solution, magnesium ion will displace the zinc ion in such process.
The position of metallic ions determines their reactivity.
What is the molality of a solution that has 6 mol of CaCl2 in 3 kg of water?
A. 2 m
B. 0.5 m
C. 6 m
D. 3 m
Answer:
2m
Explanation:
Hope this helps :)
Answer:
Answer is B.
Explanation:
3mol/6kg = 0.5m
Calculate the percentage by mass in each element
N in NH3
Answer:
82.35%.
Explanation:
Mass of 1 molecule of ammonia
NH₃ = 14+3(1)
= 17
Calculating percentage by mass of N.
[tex]\%=\dfrac{\text{Mass of Nitrogen atom}}{\text{Mass of ammonia molecule}}\times 100[/tex]
[tex]\%=\dfrac{14}{17}\times 100\\\\=82.35\%[/tex]
So, the required percentage is 82.35%.
Which describes the composition of carbohydrates?
Answer: Carbohydrates (carbo- = “carbon”; hydrate = “water”) contain the elements carbon, hydrogen, and oxygen, and only those elements with a few exceptions. The ratio of carbon to hydrogen to oxygen in carbohydrate molecules is 1:2:1.
HOPE THIS HELPS
CAN U GIVE ME BRAINLIEST
HELPPPPPPP
DETERMINE THE CHARGE OF ELECTRON CLOUD OF POTASSIUM
Answer:
+1
Explanation:
A Potassium atom is represented with the sign "K" in chemistry and have atomic number 19.
The charge of electrons causes a matter to experience a force and it can be positive or negative.
In Potassium atom, the electric charge is +1 to enter a stable electron configuration as there is only one valence electron in the outermost shell of potassium atom. As potassium atom will lose electron it will become positively charged.
Hence, the correct answer is "+1".
Plz help me it is so confusing
How can the structure of atoms be
connected to a colorful firework
display?
What is the standard deviation of this data set?
{73, 70, 80, 12, 98, 27}
A.
123.8
B.
33.2
C.
30.3
D.
28.0
To solve this we must be knowing each and every concept related to standard deviation. Therefore, 30.3 is the standard deviation of this data set. The correct option is option C.
What is standard deviation?In descriptive statistics, the standard deviation measures how widely the data points vary from the mean. It describes how values are distributed throughout the information sample and calculates how widely apart data points are from the mean.
Mathematically,
73+70+80+12+98+27 =360
mean of observations = 360/6=60
deviations from the mean
(73−60), (70−60), (80−60), (12−60), (98−60), (27 −60)=13, 10, 20, -48, 38, -33
standard deviation (σ) formula can be given as
σ=√(13)²+(10)²+(20)²+(-48)²+(38)²+(-33)²/6
On calculations, we get:
σ=30.3
Therefore, 30.3 is the standard deviation of this data set. The correct option is option C.
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What is the heliosheath?
Answer:
The heliosphere is the vast, bubble-like region of space that surrounds and is created by the Sun.
What are 3 atoms that have 6 energy levels?
How many unpaired electrons are present in V3+?
Answer: two unpaired
Explanation: In general, electrons are removed from the valence-shell s-orbitals before they are removed from valence d-orbitals when transition metals are ionized. And thus, V3+ is paramagnetic, because it has two unpaired 3d-electrons.
What are quantum numbers?
Answer:
a number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values.
Explanation:
In other words, it is a number that is Part of scientific theories or chemistry
Balance Nuclear Reaction
94239Pu --> 24He + ________
Which element is a metalloid?
Si
Ne
Br2
Cl2
Answer:
There are 2 answers. A and C
Explanation:
Si is Silicon, which is a metalloid,
Br2 is Bromine, which is a metalloid
50 points
Naturally occurring silver is composed of two isotopes: Ag-107 is 51.35% with a mass of 106.905092 amu, and the rest is Ag-109 with a mass of 108.9044757 amu. Calculate the average atomic mass of silver.
Answer:
I'm posting this so I can tell all of you that we should help him together in the comments because it seems we need more than one person to help him
If 3 moles of a compound use 12 J of energy in a reaction, what is the A
Hreaction in kJ/mol?
O A. 0.004 kJ/mol
O B. 4 kJ/mol
O C. -4 kJ/mol
O D. -0.004 kJ/mol
What volume would be occupied by 2.79 moles of nitrogen gas at STP?
Answer:
22.4
Explanation:
Which measurement shows the correct degree of precision for this ruler?
a. 1.5 cm
b. 1 cm
c. 1.55 cm
Answer:
1.5 cm
Explanation-
I took it ...
Figure S is reflected over the y-axis and then rotated 90° clockwise. Which side of Figure T' is
congruent to side 1 of Figure S?
KL
JK
MJ
LM
Answer: KL
Explanation:
The side of Figure T' that is congruent to side 1 of Figure S using relevant transformations is; KL.
How To Carry out Rotational Transformation?When rotating a shape 90° clockwise, it is expressed as;(x, y) → (y, -x).
When reflecting the image over the y-axis, it is expressed as (x, y) → (-x, y).
Carrying out the two transformations would mean that we are reflecting a shape over the y = -x line, where;
(x, y) → (-y, -x).
Thus, the side of Figure T' that is congruent to side 1 of Figure S is KL.
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2. Using what you know of particle motion in solids, liquids, and gases, explain why you think temperature changes affect a substance's
state of matter. Use the terms particle motion, temperature, solid, liquid, and gas in your answer.
Explanation:
Temperature changes have significant impact on the physical states of matter and it drives most physical changes and even the chemical alteration occurring to substances.
When the temperature of substance increases, the particle's average kinetic energy increases. The average kinetic energy of the particles is the component heat resident within a body. As this energy increases, for solids, their particles in fixed lattices breaks free and begins move. Further increase in the temperature will cause a motion which leads to flowing of the particles on top of one another. This eventually culminates in bond breaking and hence gases forms. When heat is removed, the reverse process is what is ensues.What group of elements is commonly used in jewelry and construction?
a. Alkali Metals b. Halogens .c.Noble gases d. Transition metals
Answer:
A. Alkaline Metals
Explanation:
I majored in Chemistry
How many moles of gas would there be given 29.90 liters, 336.99 mmHg and 390K?
Moles of gas : 0.414
Further explanationGiven
V =29.90 liters,
P = 336.99 mmHg = 0,443 atm
T = 390K
Required
moles
Solution
In general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm , N/m²
V = volume, liter
n = number of moles
R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m2, v= m³)
T = temperature, Kelvin
Input the equation
n = PV/RT
n = 0.443.29.9/0.082.390
n= 0.414 moles
