Answer:They change
Explanation:
Be more specific the next time you ask a question :)
What other methods can be used to identify the components in drugs if you didn't have melting point data
Answer:
ósea un abrazo
Explanation:
....m.......
Three students use a meterstick with millimeter markings to measure a length of wire. Their measurements are 3 cm, 3.3 cm, and 2.87 cm,
respectively. Explain which answer was recorded correctly.
Answer: 3 cm
Explanation:
What are the variables used in an experiment? How are they different?
Answer:
There are many items that could be altered to test the reaction of another. These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
Explanation:
a wooden baseball bat is an example of
a: compound
b: element
c: heterogeneous
d: homogeneous
A wooden baseball bat is an example of a heterogeneous substance.
A heterogeneous substance is consists of compounds that are not thoroughly mixed together.
Woods are fibrous structural substances with spaces present in trees and other woody plants' stems as well as roots. They are composed of a natural composite of cellulose fibers and are contained with a lignin matrix that is capable of resisting compression.
They can use for fire, building, the manufacture of weapons and tools, furniture, as well as paperwork.
Wood is a heterogeneous, highly porous cellular material. It is made up of cells and the cell walls are made up of roughly 40% cellulose, 15% hemicellulose, and lignin of about (15–30%).
Therefore, we can conclude that a wooden baseball bat is an example of a heterogeneous substance.
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The sun is 93 million miles from the earth approximately how many years would it take to travel from earth to the sun if a person flew in a spaceship at 55 miles an hour?
(Hint:begin by dividing the distance by the speed to determine the number of hours it would take. Round your answers the the nearest whole number.)
Answer:
it would take 2 years
Explanation:
93/55=1.69--->1.70------>2
what provided evidence of the big band theroy
Answer:wo major scientific discoveries provide strong support for the Big Bang theory: • Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.
Explanation:
which
each these
A tame the
belong
a cha Cooth
group of Compounds to
acid
can boxylic
B) Catty
*
C2H4
Answer:
please I don't understand the question, rewrite it
Determine the number of meters in 1.00 miles
Answer:
There are 1609.344 meters in a mile
Explanation:
name the types of polymerization and the differences
For Carbon - 14, the top number will be ____. The bottom number will be ____.
Metric Conversion: Which units are equivalent (the same) as 75g? (Pick 3)
(1 Point)
7500 mg
750 dg
7.5 dag
.075 Kg
The unit that is equivalent to 75g is 0.075 kg, 750 dg, and 7.5 dag. The correct options are b, c, and d.
What are measuring units?Measuring units are the units used to denote the measurement quantities. There are seven basic measuring units. They are length, Time, Amount of substance, Electric current, Temperature, Luminous intensity, and Mass.
The current unit is given grams, which are used to measure the mass of any object.
1000 grams is equal to 1 kilogram and 1 dg = 0.1 g, and 1 dag = 10 g. So by this formula, each of the quantities can be calculated.
1 kg = 1000 g
So, 0.075 kg = (0.075 × 1000)g = 75 g
1 dg = 0.1 g
So, 750 dg = (750 × 0.1) g = 75 g
1 dag = 10 g
So, 7.5 dag = (7.5 × 10) g = 75 g
Thus, the correct options are b. 750 dg, c. 7.5 dag, and d. .075 Kg.
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How many molecules are present in 2 H₂ SO4
Answer:
1 mol of H2SO4 contains 6.022 x 10^23 molecules. : 0.5 mol of H2SO4 contains 0.5 x 6.022 x 10^23 molecules. = 3.011 x 10^23 molecules . that is 49 g of H2SO4 contains 3.011 x 10^23 molecules of H2SO
Explanation:
is AU is homoatomic or heteroatomic?
Answer:
AU is homoatomic
Explanation:
Homo-atomic Molecule: Molecules provided by unique one variety of particles are associated as Homo-atomic molecules
Ex: H2, N2, P4 etc.
Hetero-atomic Molecule: Particles constituted by several kinds of atoms are identified as Hetero-atomic molecules
Ex: CO2, NO2, CH4, HCl etc
As AU is homoatomic because this element is formed by only one atom
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A piece of metal with the mass of 254 g is placed in a 50.0 mL graduated cylinder. The water level rises from 25.0 mL to 46.5 mL, what is the density of the metal?
Density is simply defined as the mass per unit volume of a substance. Mathematically, it is expressed as:
[tex]Density = \frac{mass}{volume }[/tex]
To solve the question given above, we'll begin by calculating the volume of the metal. This can be obtained as follow:
Volume of water = 25 mL
Volume of water + metal = 46.5 mL
Volume of metal =?Volume of metal = (Volume of water + metal) – (Volume of water)
Volume of metal = 46.6 – 25
Volume of metal = 21.5 mLFinally, we shall determine the density of the metal. This can be obtained as follow:
Mass of metal = 254 g
Volume of metal = 21.5 mL
Density of metal =?[tex]Density = \frac{mass}{volume }\\\\Density = \frac{254}{21.5} \\[/tex]
Density of metal = 11.81 g/mLTherefore, the density of the metal is 11.81 g/mL
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What does the half-life of a radioactive substance indicate?
A. It indicates how dangerous the substance is to humans.
B. It indicates how much energy is released over time.
C. It indicates how long it takes for the material to decay.
D. It indicates how long it takes until all radioactivity is gone
Answer:
it indicates how long it takes for the material to decay
Explanation:
hope this helps!
The half-life of a radioactive substance indicates how long it takes for the material to decay.
What is half-life of a radioactive?A half life is the amount of time it takes for half of a radioactive substance to decay.
Radioactive isotopes are defined as the isotopes which undergo decay processes very easily. They have very short half life. They are usually the isotopes of heavier elements.
Half life is defined as the time taken for the unstable isotope to fall to half its original value.
Hence, option C is correct.
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why does magnesium donate two electrons to oxygen in order to form magnesium oxide (MgO)?
Answer:
electron arrangement of Mg is 2.8.2. To reach a stable octet electron arrangement Mg donates 2 electron to oxygen.Hence, Mgo ion formed.
Which part of the Periodic Table of the elements is used to identify valence electrons? *
Answer: Groups
Explanation:
The number of valence electrons of an element can be determined by the periodic table groups in which the element is categorized
P.S. Families rows in the table!
Use this Bohr Model to answer the questions below
How many names make up binomial nomenclature?
A(3)
B(4)
C(1)
D(2)
why is water a compound but hydrogen an element
Compounds are made of more than one element hence water is made of 2 Hydrogen and one Oxygen, but nacent Hydrogen is single hence it is an element.
Einstein also said that gravity can affect not just mass but...
A.nothing else, just mass.
B.light waves or energy
C.everything.
Answer:
B. Light waves or energy
Explanation:
Einstein argued that gravity isn't a force at all. He described it as a curvature of time and space caused by mass and energy.
PLZ MARK ME BRAINLIEST.what's the agriculture
Answer:
the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.
Explanation:
Mark me as brainiliest
Answer:
Agriculture is a practice of farming, including cultivation of the soil for growing crops and the rearing of animals to provide food,wool and others.
Hope it helps !The three most common phases of matter are _______.
Answer:
solids, liquids, gases
(d) Calculate the relative molecular mass of ammonium sulphate (NH4)2SO4.5H2O
[A, O= 16.0; H= 1.0; C= 12.0; N= 14.0; S= 32.1]
Answer:
222.1
Explanation:
(14+4*1)*2+32.1+16*4+(2*1+16)*5=222.1
Calculate the mass of 1 molecule of water
with step
Molecular Mass of water:-
[tex]\\ \sf\longmapsto H_2O[/tex]
[tex]\\ \sf\longmapsto 2(1u)+16u[/tex]
[tex]\\ \sf\longmapsto 2u+16u[/tex]
[tex]\\ \sf\longmapsto 18u[/tex]
[tex]\\ \sf\longmapsto 18g[/tex]
1mole of water weighs 18g
We know
[tex]\\ \sf\longmapsto 1mol=6.023\times 10^23molecules[/tex]
Mass of one molecule:-
[tex]\\ \sf\longmapsto \dfrac{18}{6.023\times 10^23}[/tex]
[tex]\\ \sf\longmapsto 2.98\times 10^24g[/tex]
Did they scientist believe in God
Answer:
some of them not believe in God
what is an example of density? pls helppp
Answer:
sruff that has to do wuth vikun=
Explanation:
good job
Can someone plz help me answer this question
Answer:
10 ml
Explanation:
The graduated cylinder contains 19 ml of water before the silver pellet is placed inside. Afterwards, the graduated cylinder measures 29 ml of water. Therefore the pellet displaced 10 ml of water. ( 29ml - 19ml = 10ml )
How many atoms? H_____, O_____, Fe_____ Total atoms? _____ 3Fe(oh)2
Answer:
H = 6
O = 6
Fe = 3
Total atoms = 15
Explanation:
3Fe (OH)2
Fe = 1×3
O= 2× 3 = 6
H= 2× 3 = 6
Total atoms = 6+6+3=15
I hope I helped you^_^
Which statement best describes the light that will cause emission of electrons from a given metal through the photoelectric effect?
light with a low enough intensity
light with a high enough frequency
light with a high enough intensity
light with a low enough frequency
Answer:
b
Explanation:
edge 2021
The best describes the light that will cause emission of electrons from a given metal through the photoelectric effect is " light with a high enough frequency. "
What is photoelectric effect?When electromagnetic radiation, like light, strikes a substance, the photoelectric effect would be the generation of electrons.
What is electrons?The smallest atom-forming particle is an electron, which has negatively charged.
The photoelectric effect would be a phenomenon where electrically charged particles were released from or contained within a substance as electromagnetic radiation will be absorbed. The effect is often referred to as the emission of electrons from such a metal plate when light strikes it.
Therefore, the correct answer will be option (B).
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