Answer:
30 I guess
Explanation:
how many stars are there???
Answer:
one star
In our solar system, there is only one star that we know of – the sun! Our solar system is very unique in that is only has one star. Most other solar systems have at least two stars. These are called binary systems.
Explanation:
[tex]\huge\purple{Hi!}[/tex]
Some estimates peg the Milky Way's star mass as having 100 billion "solar masses," or 100 billion times the mass of the sun. Averaging out the types of stars within our galaxy, this would produce an answer of about 100 billion stars in the galaxy. This is subject to change, however, depending on how many stars are bigger and smaller than our own sun. Also, other estimates say the Milky Way could have 200 billion stars or more.
For periods 2 and above, what is the maximum number of valence
electrons that an atom can have?
Why do ionic compounds form crystals?
Answer:
The ions have a normal, repetitive structure called an ion lattice. The lattice is formed when the ions attract each other and form a regular sequence of oppositely charged ions next to each other. ... This is why solid ion compounds form crystals with normal shapes.
How are ion crystals formed?
Ions bound together by electrostatic attraction form ion crystals. ... The plain cubic crystal lattice has ions that are evenly distributed in 3D at 90° angles. The stability of ion solids relies on the lattice energy that is emitted in the form of heat as two ions are brought together to form a solid.
Explanation:
Ion crystals are made up of ions that are electrostatically attracted to one another. Ions in the simple cubic crystal lattice are uniformly dispersed in three dimensions at 90° angles. Ion solids are dependent on the lattice energy, which is released as heat when two ions are brought together to form a solid.
What are ionic compounds?Ionic bonds, also known as electrovalent bonds, are a type of connection created in a chemical molecule by the electrostatic attraction of ions with opposing charges. One atom's valence (outermost) electrons are permanently transferred to another atom to create this type of connection.
Ions (cations) are negatively charged when an atom obtains electrons whereas ions (cations) are positively charged when an atom loses electrons (anion). The compounds created between nonmetals and the alkali and alkaline-earth metals are the greatest examples of ionic, or electrovalent, compounds, which are the outcome of ionic bonding.
The electrostatic forces of attraction between opposing charges and repulsion between comparable charges arrange the ions in these types of ionic crystalline solids so that every positive ion is surrounded by a negative ion, and the converse is true. In other words, because of the way the ions are structured, the positive and negative charges alternate and balance one another, leaving the substance overall with no charge. In ionic crystals, electrostatic forces have a considerable magnitude. These chemicals thus tend to be solid and nonvolatile.
Therefore, ion crystals are made up of electrostatically attracted ions. Ions are uniformly distributed in 3D at 90° angles in the simple cubic crystal lattice. Ion solids rely on the lattice energy that is released as heat when two ions are brought together to form a solid for their stability.
Read more about ionic compounds, here
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What percent of a mammal’s genetic material comes from each gamete?
A.10%
B.100%
C.25%
D.50%
Answer:
D.
Explanation:
because gametes are sexual reproducing cells, like sperm and egg cells are gametes. and those make up 50% of you
To solve this we must be knowing each and every concept related to gamete. Therefore, 50% of a mammal’s genetic material comes from each gamete. The correct option is option D.
What is gamete?Sex cells are another frequent name for gametes. The fundamental name for them is "reproductive cells," and they are a component of human reproductive system.
These gametes are indeed the ones that aid in sexual reproduction and they are charge of creating the zygote, a whole new cell that is known as a zygote. These cells are haploid cells, in which each and every gamete typically carries a unique version of the chromosomes. 50% of a mammal’s genetic material comes from each gamete.
Therefore, 50% of a mammal’s genetic material comes from each gamete. The correct option is option D.
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How many significant figures does the number 125,000 have?
Answer:
3
Explanation:
1, 2, and 5.
Please mark me brainliest :D
Answer:
6
Explanation:
you count the zero because they are in the right side
An open "empty" 2 L plastic pop container, which has an actual inside volume of 2.05 L, is removed from a refrigerator at 5 °C and allowed to warm up to 21 °C. What volume of air measured at 21 °C, will leave the container as it warms?
2.168 L of air will leave the container as it warms
Further explanationGiven
V₁=2.05 L
T₁ = 5 + 273 = 278 K
T₂ = 21 + 273 = 294 K
Required
Volume of air
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
V₂=(V₁.T₂)/T₁
V₂=(2.05 x 294)/278
V₂=2.168 L
Which is the greater mass?0.007960 grams or 0.7960 mg?
Answer: milligrams
Explanation:
Because 0.007960 = 1.75487961e-5 pounds
And 0.7960= 1.75488e-6
Metals in general have:
a. High electrical conductivity
b. High thermal conductivity
c. High density
d. All of the above
Answer:
d. All of the above
Explanation:
What is the half life if 500 grams decays to 125 grams in 25years?
with steps pls
Answer: The half life of the sample is 60.26 years.
Explanation:
All radioactive decay reactions follow first order reaction.
The formula used to calculate the rate constant for a first order reaction follows:
[tex]k=\frac{2.303}{t}\log \frac{a}{(a-x)}[/tex]
where,
k = rate constant = ?
t = time period = 25 years
a = initial concentration of the reactant = 500 g
a - x = concentration of reactant left after time 't' = (500 - 125) = 375 g
Putting values in above equation, we get:
[tex]k=\frac{2.303}{25yrs}\log \frac{500g}{375g}\\\\k=0.0115yr^{-1}[/tex]
Now, to calculate the half life period of the reaction, we use the equation:
[tex]t_{1/2}=\frac{0.693}{k}[/tex]
where,
[tex]t_{1/2}[/tex] = half life period of the reaction = ?
k = rate constant = [tex]0.0115yr^{-1}[/tex]
Putting values in above equation, we get:
[tex]t_{1/2}=\frac{0.693}{0.0115yr^{-1}}\\\\t_{1/2}=60.26yrs[/tex]
Hence, the half life of the sample is 60.26 years.
Match these items :))))))
ph is a scale that ____ the audacity or basicity of a solution along the range of zero to 14
Why does wind blow?
Answer:
The reason why wind blows is it is because of the warm air...weighs less less than cold air, which rises. After that the cool air will move in replace of the rising warm air. The movement of the air is basically what makes the wind blow.
A bag contains exactly 22 solid-colored buttons: 4 red, 6 blue, and 12 white. What is the probability of randomly selecting 1 button that is not white?
Answer:
0.45
Explanation:
We can calculate the probability of randomly selecting one button that is not white by using the formula:
Number of non-white buttons / Total Number of buttons.
We can calculate the number of non-white buttons with the information given by the problem:
# Non-White buttons = 4 + 6 = 10
Now we calculate the probability:
10 / 22 = 0.45
The probability is 0.45, or a 45% chance.
At 27.8 °C, a gas occupies 1500 mL. What volume will it have at 100.0 °C?
Answer:
V₂ = 1866.32 mL
Explanation:
Given data:
Initial temperature = 27.8°C (27 + 273.15 K = 300.15 k)
Initial volume = 1500 mL
Final volume = ?
Final temperature = 100.0°C (100.0 + 273.15 K = 373.15 K)
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
1500 mL / 300.15 k = V₂ / 373.15 K
V₂ = 1500 mL× 373.15 K/ 300.15 k
V₂ = 560175 mL. K /300.15 k
V₂ = 1866.32 mL
Lowest freezing point: N2, CO, or CO2
Answer:
N2
Explanation:
CO freezing point is -337 F
CO2 freezing point is -109 F
N2 freezing point is -346F
This is for oceanography!
What is the measure of all dissolved solids in the ocean?
Answer:
Total Dissolved Solids (TDS): A measure of all dissolved substances in water, including organic and suspended particles that can pass through a very small filter. TDS is measured in a laboratory and reported as milligrams per liter (mg/L).
6. India is a country connected to the continent of Asia. India used to be far apart
from Asia. Which diagram below shows what happened to the plates that India
and Asia are part of?
which planets mass is nearly double that of mercury?
Answer:
earth I think like that because earth is the second planet
What mass of sodium contains the same number of atoms as 27 grams of Aluminum?
Answer:
1.35 grams of Aluminum. I think!!!! :|
Explanation:
laurenercsp6fpli I'm about done with your foolishness!!! NOW STOP!!!
Does dehydration cause blood to become hypotonic (lower osmolarity) or hypertonic (higher osmolarity)?
anatomy and physiology please help me w this :( need it now own words please.
Balance the following reaction in the space below indicate your answer for a b and c please
Answer:A=1 B= 3 C=2
Explanation: if you put a 2 where C is then the amount will then change to P4O6. so therefore keeping the P4 on the left side the same will keep that same amount & putting a 3 with the O2 on the left will increase the amount for it to be equal on both sides.
hope that makes sense sorry!
What kind of information does this map show?
O A. The natural resources found in different areas
O B. The elevation of Earth's surface features
O C. The roads that connect different cities
O D. The shapes of different landforms
SURMA
Independent variable
Answer:
Independent variable
aluminium ball
One of the main functions of the musculoskeletal system is to allow _______ of the body.
A.
reproduction
B.
movement
C.
growth
D.
maintenance
Answer:
B,Movement
Explanation:
Your musculoskeletal system includes bones, muscles, tendons, ligaments and soft tissues. They work together to support your body's weight and help you move. Injuries, disease and aging can cause pain, stiffness and other problems with movement and function.
Answer:
movement
Explanation:
you need your muscles for movement <3
Elements in this family have 1 valence electron?
Answer:
Elements in group I have one valency electron.
what is the definition of weight in science
Answer: The weight is the force acting on the object due to gravity. Some standard textbooks define weight as a vector quantity, the gravitational force acting on the object.
100 points will to help
Answer:
6. 350kg
7. 800kg
8.600 meters
Explanation: I don’t like Stealing point but this is what I think I should give you and I don’t know how your teacher learn you this...
Answer:
6 is 350kg
7 is 800kg
8 is 600 meters
Explanation:
Thanks btw
What is the point of an object where the force of gravity is considered to act?
Answer:
Center of gravity
Explanation:
Gravity always acts downward on every object on earth . Gravity multiplied by the objects mass produces a force called weight. Although the force of an objects weight acts downwards on every partial of the object , it is usually considered to act as a single force through its balance point , or center of gravity.
Which of these is an example of erosion? A light shining onto a mountain B wind blowing away sediment C rain breaking down rock D all of the above
Answer:
B wind blowing away sediment
Explanation:
Erosion is the process whereby soil, nutrients, particles are transported away from one place to another via agents like water and wind. Generally, erosion exercises its effect on the surface of the soil.
Since erosion can occur as a result of action of water or wind on the surface of the Earth, "wind blowing away sediment" is an example of erosion among the other options listed in the question.
How many moles of sulfur are in a 707 gram sample of sulfur?
a) 12.2 moles of sulfur
Ob) 52.1 moles of sulfur
c) 51.1 moles of sulfur
od) 22.1 moles of sulfur
d) 22.1 moles of sulfur
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
707 g S (Sulfur)
Step 2: Identify Conversions
Molar Mass of S - 32.07 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 707 \ g \ S(\frac{1 \ mol \ S}{32.07 \ g \ S})[/tex]Divide: [tex]\displaystyle 22.0455 \ mol \ S[/tex]Step 4: Round
Our closest answer is d) 22.1 moles of sulfur
This is due to dividing different rounded values.
Answer:
[tex]\boxed {\boxed {\sf D. \ 22.1 \ moles \ of \ sulfur}}[/tex]
Explanation:
To convert from moles to grams, we must use the molar mass. This can be found on the Periodic Table.
We are given a sample of sulfur. Look for the symbol S on the table.
Sulfur (S): 32.07 g/molThis tells us the mass of 1 mole of sulfur. Use this molar mass as a ratio.
[tex]\frac{32.07 \ g \ S}{1 \ mol \ S }[/tex]
Multiply by the given number of grams (707).
[tex]707 \ g \ S *\frac{32.07 \ g \ S}{1 \ mol \ S }[/tex]
Flip the fraction so the grams of sulfur will cancel out.
[tex]707 \ g \ S *\frac{ 1 \ mol \ S }{32.07 \ g \ S}[/tex]
[tex]707 *\frac{ 1 \ mol \ S }{32.07 }[/tex]
[tex]\frac{ 707 \ mol \ S }{32.07 }[/tex]
[tex]22.0455254 \ mol \ S[/tex]
The number we caluclated is the closest to answer choice D: 22.1 moles of sulfur