Answer:
D
Explanation:
They don't have define shape nor structure...so a random group of stars and no shape can form a irregular galaxy
NEED HELP ASAP
Select all the correct answers.
Which of these are examples of mixing and separating?
removing seed casings from grains
a soda bottle bubbling when it is opened
a bright copper statue turning green from weathering
removing salt from seawater
water decomposing to oxygen and hydrogen
Answer:
the answer is
removing seed casings from grains
removing salt from seawater
Explanation:
This question is regarding mixing and separating such as a physical change.
a soda bottle bubbling is a chemical reaction
copper statue is a chemical reaction
water decomposing to oxygen and hydrogen is also a chemical reaction
this question is talking about mixing and seperating as a physical change
Help, please!
Which property of a substance can be determined using a pH indicator ?
Density
Acidity
Electrical Conductivity
Thermal Conductivity
Boiling Point
How many moles of sodium hydroxide, NaOH, are in a 35.65 g sample
of NaOH? (The molar mass of NaOH is 40.01 g/mol.)
Answer:
0.8910 mols of NaOH in a 35.65 g sample of NaOH
Explanation:
Mass off NaOH = 39.997
given = 35.65 g of NaOH
35.65 g of NaOH * 1 mol NaOH = 0.8910, since there are 4 sig figs.
/40.01 g
A 35.65 g sample of NaOH contains 0.8910 moles of NaOH.
What is mole?The mole, denoted by the sign "mol," is the volume of a system that has the same number of atoms in 0.012 kilograms of carbon-12 as there are elementary particles.
The mole, often known as mol, is a SI unit used to measure how many particles are present in a given substance. A mole is made up of 6.02214179 atoms or other fundamental building blocks like molecules.
Mass off NaOH = 39.997
given = 35.65 g of NaOH
No of moles of NaOH =35.65 g of NaOH × 1 mol NaOH /40.01 g
No of moles of NaOH = 0.8910 moles.
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Which of the following is true about science and technology? A. Advancements in science cannot lead to advancements in technology, but technological advancements can lead to scientific advancements. B. Advancements in science can lead to advancements in technology, and technological advancements can also lead to scientific advancements. C. Advancements in science cannot lead to advancements in technology, and technological advancements cannot lead to scientific advancements. D. Advancements in science can lead to advancements in technology, but technological advancements cannot lead to scientific advancements.
Answer:
c is the answer i am positive about that is it is wrong correct me plz
Explanation:
Which is more scientific, what is the air made out of? or why is there air?
Answer:
why is there air
Explanation:
it sounds more smarter and sounds like something someone would want to know
What is the mass number of hydrogen? DUE TODAY!!!!
Why is imaging the first black hole such an amazing scientific achievement? Explain.
Answer:
The photographic evidence of a long-unseen cosmic force is an extraordinary achievement in science. ... Exciting as it is, the photo actually doesn't capture the black hole itself, nor its interior. Astronomers aimed their telescopes at the event horizon, the invisible boundary thought to surround all black holes
Explanation:
Hope this helps :)
Consider a wooden chair and a balloon. What do these two
objects always have in common?
A.Both are made of the same number of atoms.
B.Both have the same mass number.
C.Both are made of the same kind of atom.
D.Both are made of atoms.
Answer:
D)
Explanation:
It is the most realistic
PLEASE HELP ME I WILL MARK AS BRAINLIST.
When we have stomach disorder, we take antacid to solve the problem. How does it help? Support your answer with an equation.
Answer:
idk
Explanation:
Find the mass of a 50.0 ml quantity of water if the density of water is 3.25 10 poin g/ml * O 15.38 g O 162.5 g 0.0659 O 124.3g What is an extensive property? * 10 poli
25 Points Please Help ASAP! Will Mark Brainliest If All Are Answered!!
Answer:
c because it is a group of elements
Explaation:
The density of water is 1g/cm3. What might be the density of an object that floats in water
Answer:
The mass of water is known to be 1 g/mL or 1 g/cm3. If an object has a density greater than 1 g/cm3, it is denser than water and will sink. If it has a density of less than 1 g/cm3, it will float. For example, a penny is made out of zinc (7.14 g/cm3) and copper (8.96 g/cm3) so it sinks in water.
Explanation:
Jose completed an observational investigation to determine how many butterflies visited his garden each hour for one day Which option best explains why would Jose choose to complete an observational investigation?
He was able to count the number and type of butterflies that visited the garden,
He was observing the behavior of butterflies and could not control the variables
O He wanted to test how he could increase the number of butterflies visiting his garden
He was able to create a model of his garden showing the location of flowers and butterflies.
Answer:
He was able to count the number and type of butterflies that visited the garden,
Explanation:
when 1337 G of solid dry ice sublimates into gas the mass of the resulting gas is
Answer:
194.65 K
Explanation:
(−78.5 °C −109.3 °F)
Answer:
equal to the mass of the solid dry ice.
Explanation:
The mass of the gas is dependent on the mass of the solid dry ice.
Which of the following distinguishes an element from all other elements?
Its number of protons.
O
Its color in solid form.
o
Its phase at room temperature.
Its group in the Periodic Table.
Previous Question
Next Question
Answer:
Explanation:
The second best answer is its group on the periodic table.
That answer depends on the actual reason. The number of protons determines which element you are talking about.
In your own words, describe how the energy of a pendulum is changed as it moves through one cycle of its motion. Pls help online school sucks
In a perfect world without air resistance, the top of the swing would have the most potential energy, but the least amount of kinetic energy. As the pendulum falls down, it gains more kinetic energy as it travels faster due to gravitational acceleration but loses more potential energy as it loses height. The total amount of energy in the system (the sum of kinetic and potential energy) stays the same.
The energy of a pendulum is changed from Kinetic to Potential Energy (and vice-versa) when it moves through one cycle of its motion.
What is Kinetic Energy ?The kinetic energy of an object is the energy that it possesses due to its motion and is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.
When we move the bob of the pendulum to start the movement you "charge" it with Potential Energy (Gravitational) by varying its position (height) in relation to the ground.
When we release the bob it moves towards the equilibrium position changing Potential into Kinetic Energy (through the movement with Velocity).
At the equilibrium point the bob doesn't stop but goes on up to the same height "re-charging" it with Potential Energy.
The sum of Kinetic (K) and Potential (U) Energy (called Mechanical Energy is always the same:
E = K + U = constant
Therefore, The energy of a pendulum is changed from Kinetic to Potential Energy (and vice-versa) when it moves through one cycle of its motion.
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A mechanical pencil has a mass of 47.4 grams. The volume of the pencil is 15.8 cubic centimeters. What is the density of the pencil?
Answer:
3 g/cm^3
Explanation:
Density can be determined by mass divided by volume, or P=m/V.
This would be 47.4 grams (mass) / 15.8 cubic centimeters (volume). The units are grams per cubic centimeter, noted as g/cm^3.
what is balance equation and how we balance equation
Answer:
To adjust the substance condition, you need to ensure the quantity of molecules of every component on the reactant side is equivalent to the quantity of particles of every component on the item side. To make the two sides equivalent, you should duplicate the quantity of particles in every component until the two sides are equivalent.
Explanation:
1. TRUE or FALSE: A COMPOUND CAN BE BROKEN DOWN INTO SIMPLER SUBSTANCE BY PHYSICAL MEANS
2. A(N) _______IS A RADIOACTIVE FORM OF AN ELEMENT INDICATING THAT QUANTITY OF NEUTRONS HAVE CHANGED TO CREATE SUCH AN ELEMENT
A. Element
B. Isotope
C. Ion
D. Neutron
Answer:
B. Istope
Explanation:
Plz, Help :/ you can choose any question you want or all of it if you pleased.
Answer:
29. Proteins support the body's structural framework, chemical reactions, and contractions (muscle movement).
30. Proteins have a primary structure (polypeptide chain of amino acids), secondary structure (made up of alpha helices and beta pleat sheets), tertiary structure (superimposed on secondary structure), and quaternary structure (2 or more polypeptide chains with its own tertiary structure).
31. Protein molecules can denature if conditions aren't right, such as the wrong temperature or pH level. When denatured, proteins typically lose their shape and their function for a short time because their active sites become deactivated (though if conditions are too extreme, they can permanently lose their function). This happens to globular proteins because they are not nearly as stable as fibrous proteins due to their functional 3D shape.
I just did the first 3 since I could easily access the proteins section in my textbook at the moment. :)
The volume of CO2 at 99.3 kPa was measured at 455 cm3. What will the volume be if the pressure is adjusted to 202.6 kPa?
Answer:
The answer is 223.0 cm³Explanation:
To find the volume when the pressure is at 202.6 kPa we use Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question
P1 = 99.3 kPa = 99300 Pa
V1 = 455 cm³
P2 = 202.6 kPa = 202600
So we have
[tex]V_2 = \frac{99300 \times 455}{202600} = \frac{45181500}{202600} \\ = 223.008390...[/tex]
We have the final answer as
223.0 cm³Hope this helps you
When we have stomach disorder, we take antacid to solve the problem. How does it help? Support your answer with an equation.
Answer:
its help us
equation- ( a)2+(b)2+2an
How do ions form?
Please
The science of life or living matter in all it’s forms and phenomena? What’s it’s vocab answer?
Answer:
Biology
Explanation:
How might scientific knowledge about monoculture farming affect societal decisions? Please be sure to answer in complete sentences
Answer:
People could choose to practice organic farming, heirloom plants, or use GMOs.
Governments could pass laws to limit the use of monoculture farming.
Governments could pass laws requiring people to use alternate farming methods.
Get that 100.
person above is correct give them brainliest
(50 POINTS) Why does the radius of an atom increase as you go down a group on the periodic table?
A) because you are increasing the size of the electrons, which takes up more space
B) because you are adding another outer level of electrons, further from the nucleus
C) because you are adding more neutrons, which reduces the attraction between proton and electron
D) because you are decreasing the pull by the nucleus, allowing the electrons to travel further away
Answer:
B
Explanation:
The atomic radius increases as you go down a group in the periodic table. Atoms get larger because more electrons are being added in higher energy levels, and each energy level is further from the nucleus than the last. Therefore, the atomic radius increases as you go down a group.
Which of the following describes a chemical property of oxygen
Answer:
oxygen reacts with iron to form rust
Explanation:
The given options are;
(1)Oxygen has a melting point of 55 K.
(2) Oxygen can combine with a metal to produce a compound.
(3) Oxygen gas is slightly soluble in water.
(4) Oxygen gas can be compressed.
The statement that express the chemical property of oxygen from the question is that combination of Oxygen with a metal will produce a compound.
Oxygen can be regarded as one of the non metal with chemical formula O2One of the chemical property of oxygen (O2) is it's reaction with metal, when reaction occurs between oxygen and a metal, a metal oxide will be formed. The general equation goes thus(metal + oxygen → metal oxide)
When reaction occur between oxygen and iron which is a metal, iron Oxide is formed, which is a compound the reaction goes thus(4Fe+ 3O2 → 2Fe2O)
Rust is formed when there is exposure of iron to air.Therefore, reaction of oxygen with metal will give a compound, hence option 2 is right
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How much will it cost in American dollars(USD) to fill a 15 gallon tank of gasoline in Canada, if the price of gasoline there is $1.07 Canadian dollars (CAD) per liter. The current exchange rate is ($1.00(USD)= $1.34(CAD), 1 L=1.06 qts, 1.61 Km= 1 Mile, 1 gal= 4 qts]
Answer:
It will cost 45.37 US dollars (USD) to fill a 15 gallon gas tank in Canada.
Explanation:
Two values are directly proportional when when one value increases, the other increases in the same proportion, or when one value decreases, the other decreases in the same proportion.
The rule of three makes it possible to solve proportionality problems effectively and quickly. It is a method of calculating an unknown value that is directly proportional to another known value.
Then, knowing the data a, b and c, and the fourth unknown data x, which will be the unknown to be solved, this value is calculated as:
a ⇒ b
c ⇒ x
So: [tex]x=\frac{c*b}{a}[/tex]
You must calculate the cost in US dollars (USD) to fill a 15 gallon gas tank in Canada. You know that the price of gasoline is $1.07 Canadian dollars (CAD) per liter. If 1 L equals 1.06 qts, then you can say that the price of gasoline is $ 1.07 Canadian dollars (CAD) per 1.06 qts.
You can now apply a rule of three as follows: if 4 qts is equal to 1 gal, 1.06 qts is equal to how much gal is?
[tex]gal=\frac{1.06 qts*1 gal}{4 qts}[/tex]
gal= 0.265
Then you can say that the price of gasoline is $ 1.07 Canadian dollars (CAD) per 0.265 gal. So you can apply the following rule of three: if 0.265 gal costs $ 1.07 Canadian dollars (CAD), 15 gal how many Canadian dollars cost?
[tex]CAD=\frac{15 gal*1.07 CAD}{0.265 gal}[/tex]
CAD= $60.8 CAD
Finally, you can apply the following rule of three: if $ 1.34 (CAD) is equal to $ 1.00 (USD), $ 60.8 (CAD) is equal to how many US dollars (USD)?
[tex]USD=\frac{60.8 CAD*1USD}{1.34 CAD}[/tex]
USD= 45.37
It will cost 45.37 US dollars (USD) to fill a 15 gallon gas tank in Canada.
What is the density of a sample of lead that has a mass of 4.85 kg and a density of 280 cm ^3?
Answer:
The answer is 0.017 kg/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 4.85 kg
volume = 280 cm³
We have
[tex]density = \frac{4.85}{280} \\ = 0.01732...[/tex]
We have the final answer as
0.017 kg/cm³Hope this helps you
HURRY!!
In models of molecules, gray spheres are carbon atoms,
white spheres are hydrogen atoms, red spheres are oxygen
atoms, and blue spheres are nitrogen atoms.
Which model represents a molecule of ammonia, NH3 ?
In model of molecules, gray spheres are carbon atoms, white spheres are hydrogen atoms , red spheres are oxygen atoms and blue spheres are nitrogen atoms. the model represent a molecule of NH₃ is model (A) that contains one blue sphere and 3 white sphere.
Ammonia (NH₃ ) is formed with three atoms of hydrogen and one atom of nitrogen. In the molecule of NH₃ , three hydrogen atoms each shares their electron with nitrogen and form the covalent bond and molecule is formed NH₃ . in the given model (A) 3 white spheres of hydrogen are covalently bonded with one blue sphere of nitrogen.
Thus, In model of molecules, gray spheres are carbon atoms, white spheres are hydrogen atoms , red spheres are oxygen atoms and blue spheres are nitrogen atoms. the model represent a molecule of NH₃ is model (A) that contains one blue sphere and 3 white sphere.
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