Answer:
b
Explanation:
because it is the simplest substance of all matters
liquids and gasses have some factors in common?
Answer:
Both r states of matter
Merry Christmas and a happy new year
An astronomer wants to study celestial objects with the shortest wavelengths. What kind of telescope should the astronomer use for this task?
Answer:
telescope
Explanation:
i took the test
The telescope provide a means to explore the universe. There are different types of telescopes like reflecting, refracting, x-ray, gamma ray, etc. telescopes. The telescope used by the astronomer to study celestial objects with the shortest wavelengths is x-ray or gamma ray telescope.
What is a telescope?An instrument which is used to view the distant objects is defined as the telescope. The higher the magnification of the telescope, the better will be the view. The lens in the front of the telescope is known as the objective lens.
There are two types of telescopes, they are refracting and reflecting telescopes. The refracting telescopes use lenses to focus the light whereas the reflecting telescopes use mirrors.
The X-ray and gamma ray telescopes collect light in the shorter wavelengths. X - ray telescopes help to study the sun, supernova and the other stars. Gamma ray telescope study black holes and pulsars.
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The units of a formula mass are
a. amu
b. micrograms
c. moles
d. grams
Answer:
the units of a formula mass are amu.
please help ASAP ty :)
Answer:
c or d it measures smallest to biggest and biggest to smallest
Answer:
your answer is a
Explanation:
If a star moves away, its wavelengths are stretched
Answer:
This shifts the star's spectral lines toward the red end of the spectrum. The greater the shift from the normal position of the lines, the faster the star is moving.
What is the mass of NaCl produced when 2.0 moles of chlorine gas
are reacted with excess sodium? The equation is given.
2 Na + Cl2 → 2 NaCl
Answer:
Mass = 234 g
Explanation:
Given data:
Mass of NaCl produced = ?
Moles of chlorine = 2.0 mol
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
now we will compare the moles of NaCl with chlorine gas.
Cl₂ : NaCl
1 : 2
2.0 : 2/1×2.0 = 4.0 mol
Mass of NaCl;
Mass = number of moles × molar mass
Mass = 4.0 mol × 58.5 g/mol
Mass = 234 g
Cobalt (Co) has an atomic mass of 59 and an atomic number of 27. Which statement correctly describes an atom of cobalt?
A. An atom of cobalt contains more neutrons than protons.
B. An atom of cobalt contains more electrons than protons.
C. An atom of cobalt contains the same number of neutrons and protons.
D. An atom of cobalt contains the same number of neutrons, electrons and protons.
Answer:
A
Explanation:
27 us the number of protons when we subtract 27 from 59 it will be 32 because a mass number is the sum of proton and neutron but tell u more on the comment
Answer: A - An atom of cobalt contains more neutrons than protons.
Explanation: The atomic number is the number of protons in an atom. The atomic mass is the sum of protons & neutrons in an atom. So, with simple math we can figure out the number of neutrons. Total 59 - 27 protons = 32 neutrons. Which means that A is the only right answer in this case.
Little Extra: A & B would both be correct if Cobalt was a negatively charged ion. An atom is an ion if it is charged, and an ion is either negatively charged or positively charged. For example, if Cobalt had 27 protons & 26 electrons it's overall charge would be positive since it has more protons than electrons. And it would be negatively charged if Cobalt had 27 protons & 28 electrons. No charge if there are 27 protons & 27 electrons because proton +1 and electron -1. Imagine 27-27=0 no charge, 27-26= +1 charge, 27-28= -1 charge
I hope this made you smarter.
need answers for 1-15
I need these before 12:30 am please
Answer:
1.b
2.c
3.a
4.a
5.d
6.false
A student heats a 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) = CaO(s) + CO2(g)
Select one:
a. 1.4 g CaO
b. 2.1 g CaO
c. 2.5 g CaO
d. 1.0 g CaO
Answer:
1.4 g CaO
Explanation:
Given data:
Mass of calcium carbonate = 2.5 g
Mass of Cao remain in tube = ?
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of CaO:
Number of moles = mass/molar mass
Number of moles = 2.5 g/ 100 g/mol
Number of moles = 0.025 mol
now we will compare the moles of CaO with CaCO₃.
CaCO₃ : CaO
1 : 1
0.025 : 0.025
Mass of CaO:
Mass = number of moles × molar mass
Mass = 0.025 mol × 56 g/mol
Mass = 1.4 g
Answer:
1.4g CaO
Explanation:
Did the exam and got it right. Hope this helps
SOMEONE HELP ME PLEASE!!! ILL GIVE BRAINLY
Physical properties behave identically for all matter under the same conditions.
Physical properties cause atoms and molecules to change structure when substances are mixed.
Physical properties can be observed without changing the identity of a substance.
Physical properties are observed by seeing how a substance reacts with other substances.
Answer:
the answer is c
Explanation:
My reasoning is that its most likely
What is the difference between chlorine -35 and chlorine -37??
Answer:
Free chlorine involves the amount of chlorine that's able to sanitize contaminants, while combined chlorine refers to chlorine that has combined directly with the contaminants. Total chlorine is basically the sum of free chlorine and combined chlorine.
Equation that shows the formula of the reactants and products are called
Answer:
chemical equation
Explanation:
Which sentence contains a common allusion?
O A. The meeting became extremely tense.
OB. The meeting turned into Waterloo.
O C. The meeting was held in Chicago.
OD. The meeting proceeded despite obstacles.
Answer:
B
Explanation:
The sentence that is a common allusion is:
B. The meeting turned into Waterloo.
All the other choices are not considered as an allusion
What is an allusion?It is an inferred or roundabout reference to an individual, occasion, or thing or to a piece of another text. Most references rely upon the comprehension that there is a gathering of data that is shared by the essayist and the peruser consequently. the peruser will get the author's referent.
The example of common allusion from the instances given are:
The meeting turned into Waterloo.
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A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled’s potential energy? (Formula: PE = mgh)
90 J
56.8 J
441 J
882 J
Explanation:
Gravitational potential energy
= mgh = (45kg)(9.81N/kg)(2m) = 882J.
The sled’s potential energy is 882 J.
Potential energy
The potential energy of the sled is calculated using the following formula as shown below;
P.E = mgh
Where;
m is the mass of the sled = 45 kgg is acceleration due to gravity h is the heightP.E = 45 x 9.8 x 2
P.E = 882 J
Thus, the sled’s potential energy is 882 J.
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A model of the helium atom is shown below. Select all of the neutrons in the picture.
Given is a helium atom. Inside the nucleus , there are 2 protons denoted by blue colour and the other two are neutrons denoted by green colour
Chemical element helium has the atomic number 2 and the symbol He. It is the first member of the noble gas group in the periodic table and is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas.Neutrons have no charge, protons have a positive charge, and electrons have a negative charge.One proton's positive charge and one electron's negative charge are equal.While electrons have essentially negligible mass, protons and neutrons each have a mass of 1.While electrons quickly revolve around the nucleus in fixed circular orbits, protons and neutrons are present collectively in the nucleus at its center.The nucleus, located in the heart of the atom, is home to protons and neutrons, which are heavier than electrons.Learn more about helium here:
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What is the correct electron configuration for Si (atomic number 14)?
O A. 1522322p6352208
O B. 1s22s22p63s13p3
O C. 1822s22p63s23p3
O D. 1522522p3s23p2
SUIDRAT
Answer:
1s22s22p63s23p3
do you need explanation?
Radio waves carry information from
A. antenna to antenna.
B. amplitude to frequency.
C. AM to FM.
D. space to Earth.
science question
In nuclear fission, when the nucleus is hit the atom will ....what?
Answer:
When a large, fissile atomic nucleus such as uranium-235 or plutonium-239 absorbs a neutron, it may undergo nuclear fission. The nucleus splits into two or more lighter nuclei, releasing kinetic energy, gamma radiation, and free neutrons.
Explanation:
What is the name of the following compound: *
PH3
When using a light microscope, focus the specimen with the scanning objective
lens first.
Reasoning:
Answer:
The light microscope bends a beam of light at the specimen using a series of lenses to provide a clear image of the specimen to the observer.
HELPPPPPPPP
determine the number of charged particles in nucleus of calcium atom then deduce the number of electrons
NUCLEAR CHARGE (20+)
ATOMIC MASS (40 amu)
given the relative charge of a proton =1+\ m1nucleon=1amu
Answer:
detail is given below.
Explanation:
The charged particles of nucleus are protons while neutrons are neutral having no charge.
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.
one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.
While the atomic number is 20.
I need help o will give 10 points
Answer:
Plants use carbon dioxide to make their food
Explanation:
The most important role of carbon dioxide in the ecosystem is that plants use the compound to make food.
Since plants are primary produces, the food is taken by other organisms in the ecosystem for their own nourishment.
In the process of photosynthesis, green plants manufacture their own food. They use inorganic substances from the ecosystem and the energy from the sun to produce organic matter. The inorganic substance is carbon dioxide and waterSo, the carbon dioxide is an important raw material for photosynthesis to occur.A giraffe is found in the African grasslands. Is this an example of a habitat or a niche
Answer:
Niche i think
Explanation:
90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on nine comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love you
Please help does anyone know the answer? I will mark brainliest
Answer:
A. It forced the German government to pay out money it didn't have
Explanation:
Answer:
A. It forced the Germen government to pay out money it didn't have.
I JUST NEED HELP!!!!
Which group or groups of atoms are the only atoms with f orbitals?
Question 10 options:
A)
All noble gases
B)
All atoms heavier than barium (Ba)
C)
All atoms heavier than krypton (Kr)
D)
Lanthanides and actinides
Answer:
D ( I am probably wrong)
Explanation:
Answer:
All atoms heavier than barium (Ba)
arium has completely filled 5d orbitals and 6s orbitals. After barium, the lanthanide elements occur, in which inner shell 4f-orbitals are filled. So all atoms heavier than Ba possess f-orbitals.
Explanation:
in a reaction 2.5g of sodium sulphate reacted with 4.5g of barium chloride. the products are 3.5g of barium sulphate and the rest is sodium chloride. find the mass of sodium chloride produce. state the law which justifies this reaction
The mass of sodium chloride : 3.5 g
Further explanationGiven
Reaction :
2.5g of sodium sulphate + 4.5g of barium chloride ⇒ 3.5g of barium sulphate + sodium chloride
Required
The mass of sodium chloride
Solution
Conservation of mass applies to a closed system, where the masses before and after the reaction are the same
From the reaction :
mass of reactants = 2.5 g + 4.5 g = 7.0 g
mass of products = 3.5 g + mass of sodium chloride
mass of reactants = mass of products
7.0 g = 3.5 g + mass of sodium chloride
mass of sodium chloride = 7 g - 3.5 g =3.5 g
Which of the following has the highest ionization energy?
a. F or I
b. Fr or C
c. Ne or Bi
d. Kor Kr
e. Ar or Mg
Answer:
helium
The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.
Explanation:
hope it helps, mark brainliest please
Things that let electricity go through them are called
Answer: they are called electrical conductors.
Explanation:
Some materials let electricity pass through them easily. These materials are known as electrical conductors. Many metals, such as copper, iron and steel, are good electrical conductors. That is why the parts of electrical objects that need to let electricity pass through are always made of metal.
Answer:
Electrical Conductors
Explanation:
n
Question 2
2 pts
(02.03 MC)
John writes a definition for speed and time,
Speed: Speed is the distance an object moves in an amount of time
Time: The amount of time is measured in seconds, minutes, or hours
Which statement is correct about John's definitions? (2 points)
Both definitions are incorrect.
Both definitions are correct.
The definition for speed is correct, the definition for time is incorrect.
The definition for time is correct, the definition for speed is incorrect.
Answer:
yes
Explanation:
the definition for time is correct, the definition for speed is incorrect
On the basis of Boyle's law, explain why
mountaineers carry oxygen cylinders with them.
Answer:
Boyle's Law states that 'at constant temperature, the pressure of a fixed amount of gas varies inversely with the volume of the gas. Mountaineers have to carry oxygen cylinders with them to restore normal breathing because at high altitude the density of air is less.
Explanation:
I majored in Chemistry.