Answer:
false
Explanation:
Answer:
False
Explanation:
It is false as the particles of gases keep moving. They have very weak molecular bonds. They are so weak that they can move freely anywhere and in any direction. Even if you trap some gases and a closed bottle, they keep moving. We can't measure what the shape is or what the volume is. Therefore, it is false.
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A solid is held in shape by strong forces.
Ok thanks for the valuble info.
5. Why are the noble gases such as helium (He) and neon (Ne) grouped
together in the periodic table?
A They are nonreactive gases.
B. They are highly reactive metallic solids.
C. They are dangerous gases when combined with water.
D. They are liquid at room temperature and have high boiling points.
Pues
Answer:
A. They are nonreactive gases
How are oxidation states of transition metals indicated in the names of metal
compounds?
A. Prefixes are used to indicate oxidation states.
B. Group numbers are used to indicate oxidation states.
C. Roman numerals are used to indicate oxidation states.
D. Subscripts are used to indicate oxidation states.
Answer:
The anser is c
Roman numerals are used to indicate oxidation states. Hence, option C is correct.
What is the oxidation state?An oxidation state is a number given to the atom of an element when participating in a chemical reaction.
Roman numerals are used to indicate oxidation states of transition metals.
The names for transition metal compounds often have roman numerals in them, because the roman numerals indicate the charge on the transition metal. But the oxidation state of Cu in CuO is +2, and the oxidation state of Cu in [tex]Cu_2O[/tex] is +1. Name metal first and charge and transition metal with a roman numeral.
The transition metals may form more than one ion, thus it is needed to be specified which particular ion we are talking about. This is indicated by assigning a Roman numeral after the metal. The Roman numeral denotes the charge and the oxidation state of the transition metal ion.
[tex]Fe^{2+}[/tex] would be named iron (II) and [tex]Fe^{3+}[/tex] would be named iron (III).
Hence, option C is correct.
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which is an example of electromagnetic energy?
a. roller coaster
b. batteries
c. green plants
d. radio waves
d. cause it is a part of energy
Answer radio waves said the person above me wait AYO HEAR ME OUT-
what is more reactive Na ( sodium) or As ( arsenic )?
Answer:
Arsenic would be more reactive.
Explanation:
Electronegativity (tendency of an atom to attract a bonding pair of electrons) increases as you move up and to the right of the periodic table.
Elements further to the right of the table have more valence electrons, meaning they are closer to creating the full ring (8 electrons) and therefore are more reactive.
Arsenic is more further up and to the right than Sodium.
Iron (Fe) reacts
with oxygen gas (O2) to form rust (Fe2O3). Balance the equation below
by writing in the coefficients to ensure that the same number of each
kind of atom appears on both sides of the equation.
Answer:
The balanced equation is given below:
4Fe + 3O2 —> 2Fe2O3
Explanation:
Fe + O2 —> Fe2O3
The above equation can be balance by doing the following:
Fe + O2 —> Fe2O3
There are 2 atoms of O on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of O2 and 2 in front of Fe2O3 as shown below:
Fe + 3O2 —> 2Fe2O3
There are 4 atoms of Fe on the right side and 1 atom on the left side. It can be balance by putting 4 in front of Fe as follow:
4Fe + 3O2 —> 2Fe2O3
Thus, the equation is balanced
Please Answer Correctly
If correct I will mark brainliest
This is fill in the blank, not multiple choice.
QUESTION:
r is measured from the ____ of an object.
Explanation: The radius of an object is found from the center of the object to the perimeter. Radius can be any number, but it is the measurement from the center to the perimeter.
Green light has a frequency of 6.01 x 10^14 Hz. What is the wavelength? (Round to the nearest hundredth) *
Answer:
4.99 x 10⁻⁷ meters or 499 nanometers
Explanation:
Use the formula:
λ = c/ν, where λ = wavelength, c = the speed of light (it's constant, 2.998 x 10⁸ m/s), and ν = frequency
λ = (2.998 x 10⁸ m/s)/(6.01 x 10¹⁴ 1/s)
λ = 4.98835 x 10⁻⁷
Round to nearest hundreth and you get 4.99 x 10⁻⁷ meters, or 499 nanometers.
What is the value of index fossils to the fossil record?
3. How many atoms of hydrogen do 3.575 mol of hydrogen sulfide contain?
Answer:
4.3043x10^24
Explanation:
Atoms(H) = (3.575 mol H2S/1)(2 mol H/1mol H2S)(6.02x10^23/1molH)
Simple stoicheometry problem. Sorry for taking so long, took Chem sophomore year, its been a while
How do atoms combine to make different types of matter ?why? (Help ASAP)
Olaf the snowman has a mass of 38 kg, and a body temperature of -4.2 degrees Celsius. He took a sip of hot coffee with a volume of 15 mL and a temperature of 80.0 degrees Celsius. The coffee turned into ice and eventually become a part of Olaf. Determine the final temperature of Olaf.
Answer:
84.2 degrees
Explanation:
Olaf the snowman has an heat capacity of ice while the coffee can be
assumed to have the same heat capacity of water.
The final temperature of ice is approximately -4.08 °CReasons:
The heat lost by the coffee = The heat gained by Olaf...(1)
ΔQ = m₁·c₁·(T₃ - T₁) = m₂·c₂·(T₂ - T₃)
Mass of the snowman, m₁ = 38 kg
Initial temperature of the snowman, T₁ = -4.2°C
Volume of coffee, V = 15 mL = 0.000015 m³
Initial temperature of the coffee = 80.0 °C
Specific heat capacity of the snowman, c₁ = 2.097 J/(g·°C)
Specific heat capacity of the coffee, c₂ = 4.187 J/(g·°C)
Latent heat of fusion of the coffee into ice = 334 J/g
Density of the ice, ρ₂ = 997 kg/m³
Solution:
Mass of the coffee, m₂ = 0.000015 m³ × 997 kg/m³ = 0.014955 kg = 14.955 grams
Heat given to convert the coffee to ice = 334 J/g × 14.955 g = 4,994.97 J
Heat given to cool the coffee to 0°C = 14.955×4.187×80.0 = 5009.3268
Heat given to cool the coffee to 0°C = 5,009.3268 J
Heat given to reduce the temperature of the coffee turned to ice is
presented as follows;
Heat to cool frozen coffee = 14.955 × 2.108 × T₃ = 31.52514·T₃
Heat gained by Olaf = m₁·c₁·(T₃ - T₁) = 38,000× 2.097 × (T₃ - (-4.2))
Which from equation (1) gives
4,994.97 + 5009.3268 + 31.52514·T₃ = 38,000× 2.097 × (T₃ - (-4.2))
Solving with a graphing calculator, gives;
T₃ ≈ -4.08 °C
The final temperature of Olaf, T₃ ≈ -4.08 °C
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There are several differences between chemical and physical changes. Which process is a sign of a chemical change? A. Rotting potato gives all of bad smell
B. Melting block of ice leaves a large puddle
C. A cloud quickly changes shape when blown by wind
D. A plaster statue breaks when it falls into the floor. PLEASE HELP
Answer:
A. a rotten potato gives all of bad smell
Explanation:
B,C,D are all physical changes because we can reverse them back.we can cool the water back to make ice. if the wind passes again we can randomly get the same cloud shape in c. and in d we can make that statue again. but in A can we reverse the rotting process ? ( the enzyme reaction) no we cant because it is a chemical reaction it gives a bad smell because of the chemical changes occuring in it.
hope this helps
Element X reacts with chlorine to form an ionic compound that has the formula XCl₂. To which group on the Periodic Table could element X belong?
Answer:
Group 2 is the correct answer.
Explanation:
Chlorine has a charge -1. It means that X is +2 so that the formula is XCl2.
Which substance may lower air temperatures after a volcanic eruption? lava O sulfur dioxide O carbon dioxide O water vapor
The sulfur di-oxide may lower ais temperature after a volcanic eruption through volcano.
What is volcanic eruption?A volcanic eruption occurs when a volcano releases lava and gas, sometimes explosively. A 'glowing avalanche,' which occurs when newly erupted lava slides down the flanks of a volcano, is the most deadly sort of eruption.
What is volcano?A volcano is a crack in a planetary-mass object's crust that permits hot lava, volcanic ash, including gases to escape from just a magma chamber under the surface, such as Earth.
Volcanoes release a variety of gases along with particles into the atmosphere when they erupt. Because they reflect sunlight away from the earth, some of them, like ash and sulfur dioxide, have just a cooling effect. Others, such as CO2, contribute to global warming by increasing the greenhouse effect.
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What part of the earth are the plate tectonics on?
lithosphere
outer core
asthenosphere
inner core
Which of the following is a correct formula unit of an ionic compound?
-Al2F3
-Ca2O
-Ca(OH)2
-KCl2
Answer:
[tex]Ca(OH)2[/tex]Ca(OH)2Explanation:
Ca(OH)₂ is the correct chemical formula unit of an ionic compound.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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What is the balance of this reaction=1N2+3H2=2NH3
N2 + 3 H2 = 2 NH3
Reaction type: synthesis
The ____ energy of an object increases with its height.
Thermal
Chemical potential
Gravitational Potential
kinetic
Answer:
chemichal potential
Explanation:
Answer:
Gravitational Potential
Help! I am in a hurry! Will get brainliest if correct!
Answer:
nonmetel
Explanation:
Answer:
Its a non-metal
Explanation:
Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gaseous, liquids or solids.
1.Light waves (shown) are an example of what type of wave? (Lesson 4.03)
Question 1 options:
longitudinal wave
transverse wave
surface wave
-----------------------------------------------------------------------------------------------
2. During an earthquake, energy that has built up in the earth's crust is released by waves traveling through which type of medium? (Lesson 4.02)
Question 2 options:
the water
the ground
the air
a vacuum
--------------------------------------------------------------------------------
3.Sound, earthquakes, and waves in water are mechanical waves because they require a physical _______to transport energy. (Lesson 4.02)
Question 3 options:
electromagnetic field
disturbance
medium
location
-------------------------------------------------------------------------
The words that complete the blanks are;
1) transverse waves
2) the ground
3) medium
What is a wave?We know that a wave is simply the kind of disturbance that moves along a medium and in the process there is a transfer of energy from one point to another. There are various kinds of waves and the classification of the waves is based on the amount of energy that is transferred in each case.
1) We know that in the case of the light waves, the direction of the wave is perpendicular to the motion of the particle that causes the wave as such we can all it a transverse wave.
2) We know that a wave must always involve an energy that is travelling and in this case, the energy is travelling through the land and this is the ground.
3) We know that the mechanical waves must have to move through a medium of propagation. As such, mechanical waves must move through a medium.
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If 24 g rams of ozone, 03, was collected how many moles were collected?
Hey there!
Molar mass of O3 = 47.9982 g/mol
therefore:
1 mole O₃ --------------------- 47.9982 g
moles O₃ ---------------------- 24 g
moles O₃ = 24 x 1 / 47.9982
moles O₃ = 24 / 47.9982
moles O₃ = 0.500 moles
Hope this helps!
3. Which element is a nonmetal? *
1 point
Nitrogen (N)
Iron (Fe)
Titanium (Ti)
Potassium (K)
I have the coldest temperature of the atmosphere. Who am I?
Answer:
Jack Frost of course!!!!!!!
which object can electrically polarized
Answer:Static electricity works because objects which are otherwise "neutral" (in other words, objects with no net charge) can be polarized. An electric field, like one caused by a nearby charged object, can cause the charges inside of a neutral object — the protons and electrons — to move around a tiny bit.
Explanation:
A divalent metal oxide contains 60 % of metal. What is atomic weight of metal ?
Atomic weight of metal : 24
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements
Divalent metal oxide=XO
MW O = 16
MW XO₂ = X+16
[tex]\tt \%mass=\dfrac{Ar~X}{X+16}\times 100\%\\\\0.6=\dfrac{X}{X+16}\\\\0.6(X+16)=X\\\\0.6X+9.6=X\\\\0.4X=9.6\rightarrow X=24[/tex]
Question 2: Which of the following is NOT true about streams?
A. A large stream is called a river
B. All streams flow into the ocean
C. Tributaries are smaller streams
D. All streams flow downslope
Question 3: Which of the following statements is NOT part of the water cycle?
A. Water falls precipitation back to earth
B. Water soaks into the ground
C. Water evaporates from bodies to water on earth
D. Water dissolves minerals from rocks it flows over
Question 4: Which statement best describes a stream with a steep gradient?
A. It flows slowly,producing a wide valley
B. It flows slowly producing a V-shaped valley
C. It flows rapidly producing a V-Shaped valley
D. it flows rapidly producing a wide valley
Answer:
q 3 c q 2 d
Explanation:
What is the advantage of having valves in the
veins? What is the advantage of having valves in the veins
Which of the following is true about mixtures and compounds?
OA. A mixture contains different substances that are not chemically combined with one another.
OB. A compound forms when different substances chemically combine to form a new substance.
OC. Mixtures and compounds are both made of two or more different substances.
OD. all of these
Answer:
All of the above
Explanation:
what is the density of aluminum if you have a piece of aluminum that is 10.5cm x 10.5cm x 0.1cm and has a mass of 29.8 grams?
Answer:
2.7g/cm³
Explanation:
Given parameters:
Dimension of the aluminum = 10.5cm x 10.5cm x 0.1cm
Mass of the aluminum = 29.8g
Unknown:
Density = ?
Solution:
Density of a substance is its mass per unit volume;
Mathematically;
Density = [tex]\frac{mass}{volume}[/tex]
Volume of the aluminum = 10.5cm x 10.5cm x 0.1cm = 11.025cm³
So, insert the parameters and solve;
Density = [tex]\frac{29.8}{11.025}[/tex] = 2.7g/cm³