Answer:
3
Explanation:
Independent variable
What is this please help
Answer:
I think the answer is A. I am only 50% sure I am correct, but hope it helps!
Explanation:
How many moles are in 35.0g of sodium (Na).
Answer:
2.5 I don't have a explanation
10.8 1.0
Electronegativity difference of Mg and O:
yes
no
Answer:
2.3 / yes
Explanation:
edg 2020
Answer: 2.3 and yes
Explanation:
Which type of energy produces almost no waste or pollution?
A: burning coal
B: nuclear energy
C: solar energy
Answer:
B: nuclear energy.
Explanation:
It is emission-free and it saves 2.4 billion tons of carbon emissions per year. Also, the level of hazard of nuclear waste does decrease during the time.
Hope that helps!
__________ occurs when a gas changes directly into a solid without going through a liquid phase. *
sublimation
vaporization
condensation
deposition
Answer:
Deposition
Explanation:
Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.
Please help i don’t know what to say
Answer:
Explanation:
Groundwater spread over the years
Which of the following are properties of ionic compounds?
A. hard solids with high melting and boiling points.
B. soft and good conductors of electricity.
C. both A and B
D. good conductors of electricity, but only when dissolved in water
Answer:a and d
Explanation:
The properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.
What are Ionic solids?Ionic solids are made up of ions joined together by ionic bonds. "Ionic bonding" is a type of chemical bond between a positive and a negatively charged ion where the transfer of electrons occurs.
They are too hard, and the ionic solids’ melting point is usually too high due to powerful forces between the anions and cations.
They are known as electrical insulators when they are in a solid-state. Apart from this, the molten salts do behave with electricity since the ions are not closed in the lattice.
Therefore, the properties of ionic compounds are hard solids with high melting and boiling points and good conductors of electricity, but only when dissolved in water and the correct options are option A and D.
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Copper sulfate, when it is dissolved in water, has a blue color. When steel wool is mixed with a copper sulfate solution, the steel wool disappears, a brownish solid forms, and the color of the solution changes from blue to green.
Choose one answer that gives the best evidence that a chemical reaction took place.
A. The color change from blue to green happens in nature.
B. The disappearance of the steel wool shows that a new substance has formed.
C. The solid precipitate is a waste product in the reaction.
D. Energy is lost in this reaction like all other reactions.
Which answer did you choose? Explain your reasoning.
Answer:
A. The color change from blue to green happens in nature.
Explanation:
The color change is an indicator of a chemical reaction that has occurred. Although color changes are not necessarily good diagnostic tool to measure if a chemical reaction has occurred or not.
In this reaction, color changes is quite an effective tool Chemical changes usually involves the formation of a new product from the chemical reaction. Also, the steps are not easily reversible.For this reaction, color change is the most appropriate signal for a chemical change.The evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
The electrochemical series is arrangement of elements in order of decreasing reactivity. It is important to note that the elements that are high up in the electrochemical series can displace the elements that are lower in the series from their aqueous solution.
Steel contains iron which lies above copper in the electrochemical series hence a chemical change occurs when steel dissolves in the copper solution.
Hence, the evidence that shows that a chemical reaction has taken place is the disappearance of the steel wool shows that a new substance has formed.
Learn more: https://brainly.com/question/8646601
The type of response when a plant moves away from the stimulus
Answer:
A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism. Plants also exhibit phototropism, or growing toward a light source. This response is controlled by a plant growth hormone called auxin.
Explanation:
state the volume of SO2 and O2 at RTP that would produce 180cm3 of SO3
Answer:
(180 cm^3 SO3) x (2 mol SO2 / 2 mol SO3) = 180 cm^3 SO2
(180 cm^3 SO3) x (1 mol O2 / 2 mol SO3) = 90 cm^3 O2
we need to use the table to provide the answer, help ;-;
a. The symbol [tex]\tt _{11}^{23}Na[/tex], [tex]\tt _{18}^{40}Ar[/tex], [tex]\tt _{15}^{31}P^{3-}[/tex], [tex]\tt _{13}^{27}Al^{3+}[/tex]
b. Isotope of Na
Further explanationAtomic number=number of protons=number of electrons(neutral atom)
Number of neutrons=mass number-atomic number
Mass number=protons+neutrons
B. atomic number=11, mass number=11+12=23⇒Sodium
[tex]\tt _{11}^{23}Na[/tex]
C. atomic number=18, mass number=18+22=40⇒Argon
[tex]\tt _{18}^{40}Ar[/tex]
D. atomic number=15, mass number=15+16=31, charge -3(electron-proton)⇒Phosphor
[tex]\tt _{15}^{31}P^{3-}[/tex]
E. atomic number=13, mass number=13+14=27, charge +3(proton-electron)⇒Aluminium
[tex]\tt _{13}^{27}Al^{3+}[/tex]
Isotope=the same atomic mass, different neutron(mass number)
So the atom⇒isotope of Sodium(Na)
!PLEASE HELP ASAP!
Ammonium chloride reacts with calcium oxide to produce ammonia, calcium chloride, and water. If 7.4 grams of ammonia are produced, how many grams of calcium chloride are also
produced?
Answer:
Mass of calcium chloride produced = 24.14 g
Explanation:
Given data:
Mass of ammonia produced = 7.4 g
Mass of calcium chloride produced = ?
Solution:
Chemical equation:
2NH₄Cl + CaO → 2NH₃ + H₂O + CaCl₂
Number of moles of ammonia produced:
Number of moles = mass/molar mass
Number of moles = 7.4 g/ 17 g/mol
Number of moles = 0.435 mol
Now we will compare the moles of ammonia and calcium chloride.
NH₃ : CaCl₂
2 : 1
0.435 : 1/2×0.435 = 0.2175 mol
Mass of calcium chloride produced:
Mass = number of moles × molar mass
Mass = 0.2175 mol ×110.98 g/mol
Mass = 24.14 g
Substance A is tested to see if it is an acid or a base. A piece of iron is placed
in substance A and the iron starts to wear away over time (corrosive).
Substance A has a sour taste, and will produce a burning/tingling feeling
when touched with a bare hand. Is Substance A an acid or a base?
Answer:
[tex]\huge\boxed{\sf Acid}[/tex]
Explanation:
An acid has the following properties:
=> Is corrosive to Iron and reacts with it.
=> Has a sour taste.
=> Produces a burning sensation when touched.
So, Substance A is an acid.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807Which type of animal can breed on their own but have undergone physiological or behavioral changes due to captivity?
O Undomesticated animals
O Domesticated animals
O Semi-domesticated animals
O Tamed wild animals
Ethanol is a:
A. substance
B. heterogeneous mixture
C. homogenous mixture
Answer: i think it is A
Explanation:
hope this helps!
which other metal can substitute (in place of) iron explain you answer.. Aluminum, copper or iron?
Answer+Explanation:
Titanium ( in place of iron)
Titanium could be an excellent replacement for iron when it comes to tensile strength versus weight. It would be the first choice as a building material metal and building skeletons/bridges would use titanium instead of iron.
Magnesium alloys (in place of aluminum)
Magnesium alloys potentially met the present demands for lighter and reliable construction. With comparable specific stiffness, higher specific strength and energy absorption magnesium alloys have the potential to replace steel and aluminum alloys.
aluminum (in place of copper)
Most non-copper metal cabling is aluminum, and it is often used in areas where copper is not a likely alternative. However, it is used more now as a replacement than it has ever been. It is cheaper than copper, and its relative density allows for more cable to be made from a ton of aluminum than a ton of copper.
hope it helps you
A compound composed of only C and H contains 79.88 % C by mass. What is its empirical formula?
C a CH 3
Ob.CH 2
Oc CH 4
0 0 CH
Оe. Сэн
Answer:
a. CH3
Hope this helps.
Yo I need help with 1 and 2
Answer:
1-
A) H2O B) HCO3-
2-
A) NH3 B) SO3-2
Explanation:
The Top Thrill Dragster, a rollercoaster at Cedar Point in Ohio, soars through the air at 176ft/sec. How fast is this in mph?
The rollercoaster has a speed of 176 ft/sec. This can be converted to miles per hour. The speed is equivalent to 120 mph.
What is speed ?Speed is a physical quantity measuring the distance travelled by an object per unit time. Speed is a scalar quantity. The rate of speed is called velocity.
The speed can be expressed in different units. such as m/s, km/h, ft./s miles per hour etc. These units can be interconverted using specific relations.
One ft/s = 0.682 mph
then, 176 ft./s = 0.682 × 176 = 120 mph.
Therefore, the speed of the roller coaster is 120 mph.
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25 pointss How do the plates and mantle interact at each type of plate boundary?
Answer:
what that girl said lol
Answer:
honestly.. idk lol
Explanation:
why is iron important constructing bridges and houses?
What is the relationship between plastic and gasoline?
Answer:
Explanation:
Both plastic and gasoline are products of pretroleum
A wave with a higher frequency has a longer wavelength
TRUE
FALSE
Answer:
FalseA wave with a higher frequency have a shorter wavelength, the higher the sound it, the closer the arcs of the wavelength are, the faster the sound is, the shorter they are.
According to scied.ucar.edu ~ "The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength. Light waves have very, very short wavelengths."
Hope this helps
Explanation:
May I have brainliest please? :)
A wave with a higher frequency has a longer wavelength is a false.
Relation of frequency, energy and wavelengthA wave with a higher frequency has a longer wavelength is a false statement because shorter wavelength have higher frequency and also higher energy.
We know that longer wavelength of a wave having shorter frequency and shorter energy while on the other hand, the shorter wavelength of a wave having higher frequency and higher energy so we can conclude that the statement is false.
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The source of alpha particles in a smoke detector is the
The source of alpha particles in a smoke detector is the Americium.
Calculate the energy and frequency of red light having a wavelength of 6.55 x 10⁻7m.
Answer:
E = 3.035× 10-¹⁹J = 1.9eV
f = 4.58 × 10¹⁴Hz
Explanation:
wavelength = 6.55 × 10-⁷m
c = 3 × 10⁸m/s
f = ?
E = ?
a) f = c/wavelength
f = 3 × 10⁸/6.55 × 10-⁷
f = 4.58 × 10¹⁴Hz
b) E = hc/wavelength
E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷
E = 3.035 × 10-¹⁹J
1ev = 1.6 × 10-¹⁹J
Therefore E = 3.035/1.6 = 1.9eV
Which has a lower freezing point oxygen or ethanol
Answer:
Oxygen
Explanation:
i REALLY think it is
How can you separate sand, sugar and gravel
Answer:
Grating
Explanation:
I think you need to grate it
Answer: The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separate
Explanation:
What is a covalent bond?
50mL of ethanol (density=0.79 g/mL) is dissolved by 400 mL of water. What is the concentration of ethanol in this solution?
The concentration of ethanol in this solution : 2.14 M
Further explanationMolarity is a way to express the density of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\tt \large{\boxed{\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
Where
M = Molarity
n = Number of moles of solute
V = Volume of solution
Ethanol(C₂H₅OH) MW =46,06844 g/mol[
mass of solute (Ethanol)[tex]\tt 50\times 0.79=39.5~g[/tex]
mol of Ethanol[tex]\tt \dfrac{39.5}{46.06844}=0.8574[/tex]
molarity[tex]\tt \dfrac{0.8574}{0.4}=2.14~M[/tex]
**WHOEVER SOLVES THIS GETS A LOT OF POINTS
***Look at img below
Answer:
what
Explanation:
I cant see your question yet
Answer:
the question really said :