Answer:
A. grou(I)
B. 3rd period
C. Sodium (Na)
Explanation:
it belongs to group (I) since it has one valence electron
it belongs to 3rd period since it has three energy levels
Which of the following substances is an element? A. water B. table salt C. iron oxide D. hydrogen
Answer:
[tex]\boxed {\tt D. \ Hydrogen}[/tex]
Explanation:
An element has a uniform composition, cannot be broken down by chemical change, every atom has the same atomic number, and can be found on the Periodic Table.
Water is made of hydrogen and oxygen atoms (H₂O) so it is not an element.
Table salt is made of sodium and chloride atoms (NaCl) so it is not an element.
Iron oxide is made up of iron and oxygen atoms, so it is not an element.
Hydrogen is an element. It can be found on the Periodic Table as element H.
The correct answer is D. Hydrogen
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3-Mention the trends in atomic size,atomic number,mass number,reactivity,boiling & melting points.
Answer:
1 sec......................
Answer:
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Explanation:
Which symbol and unit of measurement are used for resistance?
symbol: R: unit :
symbol: 0; unit: R
symbol: R: unit o
symbol: R: unit R
Answer:
Unit of resistance is Ω (Omega).
Explanation:
The ability to measure the oppose the flow of electric current is called resistance of a circuit. Its relation with voltage and current is given by Ohm's law as follows :
V = IR
R is resistance
Its unit is Omega and it is represented by Ω.
The unit of the electrical resistance is ohm Ω
The symbol of resistance is R.
Hence Option A) Symbol: R, Unit : Ω is the correct answer
What is resistance?Resistance is simply the measure of the opposition to current flow in an electrical circuit.
Ohm’s law states that the potential difference between two points is directly proportional to the current flowing through the resistance.
V = I × R
Where;
V is the voltage or potential difference. I is the current.R is the resistance.The unit of the electrical resistance is ohm Ω
The symbol of resistance is R.
Hence Option A) Symbol: R, Unit : Ω is the correct answer
Learn more about Ohm’s law here: brainly.com/question/2364325
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How many moles of potassium are there in 1 kg of potassium?
Answer:
i think its 39 not to sure
Explanation:
Selena is learning about how engineers choose metals for spacecraft. She discovers that spacecraft engineers often mix other metals with titanium. Titanium is a metal that is both lightweight and strong. It also resists corrosion. Selena wants to compare titanium with other metals. She looks at the cell from the periodic table that represents titanium.
Explain what each of the four items in the cell represents. Then, classify titanium as an alkali, alkali earth, or transition metal.
Ti is a transition metal.
Further explanationChemical symbol represent element or compound
The elements are arranged in the periodic system
1. 22This is the atomic number of Titanium
The Atomic Number (Z) indicates the number of protons of an element
2. TiThis is the symbol (chemical formula) of titanium
3. 47.90This is the mass number of Titanium
Mass Number (A) = Number of protons + Number of Neutrons
Atomic Number (Z) = Mass Number (A) - Number of Neutrons
4. TitaniumThis is the name of the element
To determine which group, alkaline, alkaline earth or transition it can be seen from the electron configuration
alkali and alkali earth : configuration from orbital 1s-7s
transition : configuration from orbital 3d-6d (Block d)
Electron configuration from Ti : [Ar] 3d²4s²
if we look at the configuration, then Ti is in the d block which is included in the transition metal
Answer:
The answer is 26
Explanation:
I just took the test
WHAT MAKES ELECTRONS JUMP TO OTHER ORBITS AROUND THE NUCLEUS THEN FALL AGAIN
Answer:
Explanation:
Electrons absorb energy in photons. This makes the eclectron excited. An electron in an excited state can release energy and fall to a lower orbit
what is the term for photosynthesis
3.6 x 10-6 in standard notation.
Answer: 0.000036
Explanation:The standard form is just the normal method of depicting a number. To get from scientific notation to standard form, you would multiply the number from the scientific notation by the increasing / decreasing factor (10n). When the factor decreases, the 10 is raised to a negative power and the decimal moves to the left n amount of times (example the
10−5 moves your decimal in 3.6 over to the left 5 times leaving you with 0.000036). The opposite is true for increasing factors.
3.6 x 10⁻⁶ in standard notation is 0.0000036.
Standard notation refers to the conventional symbols, terms, and formats used to represent mathematical, musical, scientific, or other technical concepts.
Scientific notation is a way to express very large or very small numbers using powers of 10. It is commonly used in scientific and mathematical calculations to represent numbers that are too big or too small to be conveniently written in standard decimal notation.
To convert a number in scientific notation to standard notation, multiply the coefficient by the power of 10.
In 3.6 x 10⁻⁶, the coefficient is 3.6 and the exponent is -6.
To convert it to standard notation:
3.6 x 10⁻⁶ = 0.0000036
To learn more about the standard notation, follow the link:
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two disadvantages of series connection?
Answer:
1- if one component in a series circuit fails, then all the components in the circuit fail because the circuit has been broken.
2- the more components there are in a series circuit, the greater the circuit's resistance
what kind of rock requires heat and pressure to form?
A-sedimentary rock
b-igneous rock
c-clastic rock
d-metamorphic rock
Answer:
Sedimentary rock can change into metamorphic rock or into igneous rock. ... Igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals. The minerals can form crystals when they cool.
Explanation:
answer: d-metamorphic rock
7. The density of gasoline is 0.70 g/cm². How many cm of gasoline have a mass of 80
g?
A 875 cm3
B 88 cm3
C 1,143 cm3
D 114 cm3
Answer Is C 1,143
Explanation:
First to answer both CORRECTLY gets brainleist!
Answer: I am actually studying about Stars, so I got you.
3. As the temperature of a star Increases, it's luminosity increases.
As the temperature of a star decreases, it's luminosity decreases.
4. Hot and Bright. The bigger the star, the hotter it gets is from what I learned.
Answer: As the temperture of a main sequence star increases, the luminosity increases, vice versa
Cool and bright
Explanation:
Which metals have similar chemical properties?
barium
beryllium
rubidium
radium
titanium
calcium
platinum
Answer:
Barium
Beryllium
Radium
Calcium
Explanation:
Rain is falling at 2.00 inches per hour. How many inches have fallen in 6000.0 seconds?
how many significant figures are in the number 3×10⁶
Answer:
1 significant figure
Explanation:
3×10^6 is 3,000,000
Non-zero digits are always significantAny zeros between two significant digits are significantA final zero or trailing zeros in the decimal portion ONLY are significantExample: .500 or .632000 the zeros are significant
.006 or .000968 the zeros are NOT significant
what are Atoms?
what do they do?
Answer:
atoms are small particles that make up everything even living things and non living things
Explanation:
A star's mass determines the —
A) shape of a Star
B) location of a star
C) length of its lifecycle
D) galaxy it belongs to
1. Based on its location, which element would you predict has chemical properties most
similar to argon (Ar)?
A. Chlorine (CI)
C. Nitrogen (N)
B. Helium (He)
D. Aluminum (Al)
Answer:chlorine
Explanation:
It’s the answer on the big test
The chemical formula for hydrogen
peroxide is H2O2. What is the total
number of atoms in one molecule of
hydrogen peroxide?
A 2
B 4
C6
D 8
Write the difference between isomerism and allotropy with one example each.
Answer:
hope it helps ..
Explanation:
Allotropes can be defined as different types of compounds made out of the same single element but in different chemical formulas and different arrangements. Isomers can be defined as the chemical compounds that have a similar molecular formula but with different structural formulae. Graphite and Diamond.
A 5 kg block
is pulled across a table by a horizontal force of 4O N with a frictional force ot 8N pOsing the motion. Calculate the acceleration of the oject. 12 An ahia iddt
Answer:
By Newton's 2nd law, m*a=sum_of_forces where m is the mass and a the acceleration. Here there are two forces in opposed directions.
Thus 5*a=40-8=32 therefore a=32/5=6.4m^s/2
List three organelles found in cells and describe their functions.
nucleus: controls cell
cell membrane: controls what goes in and out of a cell
cytoplasm: where chemical reactions take place
Answer:
Nucleus: DNA Storage
Mitochondrion Energy production
smooth Endoplasmic Reticulum (SER) Lipid production; Detoxification
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What does Planck's equation E = h × v determine?
the number of lines on the atomic spectrum for an atom
the color of the lines on the atomic spectrum for an atom
the energy released as an electron moves to a higher orbital
the energy released as an electron moves to a lower orbital
b
the color of lines
Explanation:
on the atomic spectrum for an atom
Which best compares a molecule that has a trigonal planar shape with one that has a trigonal pyramidal shape?
O They both contain three lone pairs of electrons around the central atom.
O They both contain three atoms around the central atom.
O The central atom of the trigonal planar molecule has two lone pairs around it, but the central atom of the trigonal
pyramidal molecule has only one.
O The central atom of the trigonal planar molecule has two atoms around it, but the central atom of the trigonal
pyramidal molecule has only one.
Answer:
B. They both contain three atoms around the central atom.
Explanation:
Answer: b
Explanation:
Which step in the Scientific Method should be done after asking a question and before developing a hypothesis? A)analyze the data
B)communicate findings
C) conduct background research D)design an experiment
Which statement is the best description of a chemical bond?
O A. A chemical bond connects 2 different molecules.
B. A chemical bond holds atoms together.
C. A chemical bond turns molecules into atoms.
D. A chemical bond identifies atoms in a molecule.
The answer Is B;A chemical bond holds atoms together.
which solution is most likely to conduct electricity when it is dissolved in water?
a)CH3OH
b)C6H12O6
c)SrCl2
d)NH3
Explanation:
Glucose (C₆H₁₂O₆) is an electrolytes hence it conduct electricity.
Therefore,
Option B is correct.
Ninety percent of plastic is made from the same stuff used to
manufacture:
Answer:
Polyethylene terephthalateHope this helps you Do mark as brainliest ✌️How many molecules are in 937 g of calcium acetate?
Answer:
158.17
Explanation:
divide the given mass by the molar mass
which natural disaster is most unpredictable?
Answer:
Explanation:
Earthquakes
Earthquakes: Nature's most unpredictable and one of her most devastating natural disasters.
Answer:
Earthquake
Explanation:
Because we have not discovered any high techto predict it, In 2011 a 9.0 earthquake hit the coast of Sendai they had no warning