Answer:
Number of Significant Figures: 7
Explanation:
The Significant Figures are 9 7 4 9 0 0 0. Remember: the first zeros don't count!
RESPONSES MUST BE WRITTEN IN YOUR ANSWER PACKET RESPONSES MUST BE WRITTEN IN YOUR ANSWER PACKETESSAY QUESTION:Answer your essay question in space below 20ptsHow are the key elements of scientific thinking used in the following scenario?(Use 3+ specific examples)While you are heating water in an electric kettle, you notice it fails to boil water. Thinking that some part of the kettle (coil or cord etc.) is malfunctioning, you notice there is no change in the water temperature. Assuming you forgot to plug the kettle in, you check and discover it is plugged into the wall (outlet). You then take the kettle to a different room and try plugging it into a different outlet – you find the kettle works. You conclude that there is no power in the kitchen. Coming back to the kitchen, you turn on the light and find that nothing happens.
Answer:
i mzxd vsdfvdsfbdfdf
Explanation:
Answer:
i dont get it
Explanation:
Explain why ammonia is a gas at room temperature
Answer:
Originally Answered: Why is ammonia in gas form at room temperature? That is because ammonia's boiling point is -33.34 Celsius or -28 Fahrenheit. The average household temperature is about 28 to 32 Celsius depending where you live but wherever it is, it is definitely above the boiling point of ammonia.GOOD LESSONS ♡
Jan was told by her mother to clean a kettle which had a heavy deposit of limescale. Her friends suggested the following products that could be used to achieve this: Zippo, Wham Bam, Scale Away and Blorox. Jan found that Scale Away successfully removed the limescale deposit while the others did not. Propose a hypothesis to explain the above observation?
Answer:
what happened when they removed the limescale?
Explanation:
What is the potential energy of a 2 kg rock sitting at the top of a 10 meter high cliff?
Answer:
im sorry im bored can we talk
Explanation:
lol
√2a-3 =
√a+ 7 solve
Answer:
[tex] \huge100(3 + 2\sqrt{2} )[/tex]
is the right answer.
Which lists the waves in order of wavelength, from longest to shortest?
A) X-rays, infrared, radio waves
B) infrared, visible light, gamma rays
C) ultraviolet, microwaves, visible light
D) radio waves, gamma rays, visible light
Answer:
B
Explanation:
gamma rays have the shortest wave length
Infrared, visible light and gamma rays are lists of the waves in order of wavelength, from longest to shortest. Hence, option B is correct.
What is wavelength?Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.
Hence, option B is correct.
Learn more about wavelength here:
https://brainly.com/question/4112024
#SPJ2
what is an example of a composite material
Answer:
Reinforced concrete and masonry.
Composite wood such as plywood.
Reinforced plastics, such as fibre-reinforced polymer or fiberglass.
Ceramic matrix composites (composite ceramic and metal matrices)
Metal matrix composites.
Explanation: These are some composite this should help
What is the mass of 2.2 moles of Beryllium chloride
Answer:
the mass of 2.2 moles of Beryllium chloride is
Explanation:
175.8200004 gram
QuesLIVII 2 PUNILS)
Explain the difference between ionic, polar covalent and nonpolar covalent bonds and how
electrons are used in the bond. Use the table below to identify the bond present in the 5
molecules. Show your calculations of the electronegativity difference between elements to
support the identified bond.
Element
Carbon
Nitrogen Sodium Chlorine Magnesium Fluorine Hydrogen
(N)
(Mg) (F) (H)
(Na)
(CI)
Electronegativity
2.5
Value
3.0
0.9
3.0
1.2
4.0
2.1
a) MgCl2
b) F2
c) NaCl
Sign Out
Answer:
See explanation
Explanation:
An ionic bond involves the transfer of electrons from one atom to another. Typically, ionic bond occurs between a metal and a non metal such as between Na and Cl.
A polar covalent bond occurs between two elements having a significant difference in elctronegativity. As a result of this, the shared electron pair is closer to the more electronegative atom thereby making the molecule polar.
A covalent bond involves the sharing of electrons between two atoms that are very close in electronegativity values. The shared electron pair is located at an equidistant position from the nucleus of the both bonding atoms.
For MgCl2, the electronegativity difference is 3.0 - 1.2 = 1.8, the bond is ionic
For F2, the electronegativity difference is 4.0 -4.0 = 0, it is a pure covalent bond.
For NaCl, the electronegativity difference is 3.0 - 0.9 = 2.1, the bond is ionic
what happens when washing soda is exposed to the atmosphere
Answer:
they lose their water
Explanation:
When exposed to air washing soda crystals lose their water of crystallisation and become amorphous. ∴ The phenomenon is called efflorescence.
the _ of an element is the average mass of an element naturally occurring atom, or isotopes,taking into account the _ of each isotopes
Answer:
the atomic mass of an element is the average mass of an element naturally occurring atom, or isotopes, taking into account the percentage of each isotopes
Explanation:
The atomic mass of an element is obtained by obtaining the relative abundances (in percentages) of naturally occurring atoms and the masses of the isotopes. The atomic mass can also be defined as the sum of the protons and the neutrons in the nucleus of an element.
In the periodic table, the atomic mass is indicated below the symbol of each of the elements and is usually in the decimal form.
please answerrrrrrrrrrrrrrrrrrrrrrrrr
Answer: I'm in no way like an expert but I've heard water goes from an elevated area to a lower area. So it should be arrows that start at a more elevated to less elevated. Like white to brown, and orange to yellow, and stuff like that. I hope that helped? Anyway, have a lovely day!
Explanation:
The force that keeps the planets in orbit is________.
Question options:
mass
gravity
friction
kinetics
Answer:
The force that keeps the planets in orbit is gravity.
Question 5(Multiple Choice Worth 5 points)
Two samples of water, 10 grams and 50 grams, are in separate cups. Which of the following properties is different for the two?
O Boiling point
O Color
O Density
O Volume
Answer:
Density
Explanation:
Answer: the answer is density
Explanation:
What is the vapor pressure at 35°C of a solution made by dissolving 44.6 g of sucrose, C12H22O11, in 62.3 g of water? The vapor pressure of pure water at 35°C is 42.2 torr.
Answer:
The correct answer is 40.861 torr.
Explanation:
Based on the given information, the weight of the solute (sucrose) given is 44.6 grams, the weight of the solvent, that is, water given is 62.3 grams, and 42.2 torr is the vapor pressure of pure water.
Now the molecular weight of sucrose is 342 grams per mole, and the molecular weight of water is 18 grams per mole.
The mole fraction of solute will be,
Mole fraction of solute = Weight of solute/Molecular weight of the solute/Weight of the solvent/molecular weight of the solvent + Weight of the solute/Molecular weight of the solute
= 44.6 grams/342 grams per mole/62.3 grams/18 grams per mole + 44.6 grams/342 grams per mole
= 0.1304/3.461 + 0.1304
= 0.0363
Now using relative lowering of vapor pressure,
Vapor pressure of pure water-Vapor pressure of solution/Vapor pressure of pure water = Mole fraction of solute
42.4 torr - PS/42.4 torr = 0.0363
Ps = 42.4 -1.5395
Ps = 40.861 torr
Hence, the vapor pressure of the solution is 40.861.
What forms when two atoms combine?
Answer: A molecule is formed when two or more atoms combine together.
Hope this helps!
why one has higher mass and why?
0.5 mole of coz or 16g of sog
so2 has mass of 16gm and co2 has mass
of 22gm. Thus co2 has more mass.
Explanation given in the image.
Hope it helps!
15. A substance that has a melting point of 1074 K
conducts electricity when dissolved in water, but
does not conduct electricity in the solid phase. The
substance is most likely
A) an ionic solid
C) a metallic solid
B) a network solid
D) a molecular solid
Answer:
Ionic solid.
Explanation:
Ionic solid dissociated into free ions capable of conducting electricity in aqueous solution. Ionic solids are also characterised by high melting point due to strong ionic bonds. No free ions or electrons to conduct electricity in solid form.
The substance conducts electricity when dissolved in water, but does not conduct electricity in the solid phase and will be most likely an ionic solid. Therefore, option (A) is correct.
What are ionic solids?Ionic solids can be described as made of lattices of alternating ions. They are not close-packed structures because they like ions would have to touch. Ionic solids are commonly insulators because electrons are tightly held to the ions. They have high melting points due to strong ionic bonds
Due to the strong attractive forces between ions in ionic solids, they have high melting and boiling points. An ionic compound can conduct electricity in water and when it is melted.
In solution, the ions of the ionic solids are free to move and can conduct an electrical charge. The molten state also gives freedom of movement for the ions to conduct while Ionic solids are good insulators.
The ions in the solid cannot move due to the strong attractive forces between oppositely charged ions and, therefore, they do not conduct electricity well.
Learn more about ionic solids, here:
https://brainly.com/question/11205219
#SPJ6
Find the empirical formula of a
compound which contains 80% carbon
hydrogen by mass
and 20%
Answer:
Element
%
Atomic weight
Percentage at weight
Simple ratio
C
80
12
H
20
1
Hence, empirical formula of hydrocarbon .
Hope it will help you......when light mass nuclei combine to form a heavier more stable nucleus this is called
Answer:
Nuclear fusion
Explanation:
Science
In an experiment, the independent variable __________. (WILL MAKE BRAINLIEST)
A.
always influences the dependent variable
B.
is the same for all groups in an experiment
C.
is influenced by the dependent variable
D.
is manipulated or varied by researchers
Thanks to anyone who helps! :)
Answer:
D
Explanation:
Independent variables (IV): These are the factors or conditions that you manipulate in an experiment. Your hypothesis is that this variable causes a direct effect on the dependent variable. Dependent variables (DV): These are the factor that you observe or measure.
help !! Im not sure how to do this
SHOW WORK
A football field is 120.0 yards long, how long is a football field in inches?
Answer:
4320 inches
Explanation:
---
How is electrical energy produced??
Answer:
Most electricity is generated with steam turbines using fossil fuels, nuclear, biomass, geothermal, and solar thermal energy. Other major electricity generation technologies include gas turbines, hydro turbines, wind turbines, and solar photovoltaics.
Explanation:
i hope this give you a bit more help
What is the molarity of a solution made by dissolving .75mol of NaCl in 3.0L of solution?
How many molecules are in 7.5*10^19 particles of Fe2O3?
Answer:
7.5 × 10¹⁹ molecules Fe₂O₃
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
7.5 × 10¹⁹ particles Fe₂O₃
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]7.5 \cdot 10^{19} \ particles \ Fe_2O_3(\frac{6.022 \cdot 10^{23} \ molecules \ Fe_2O_3}{6.022 \cdot 10^{23} \ particles \ Fe_2O_3} )[/tex] = 7.5 × 10¹⁹ molecules Fe₂O₃
Use the image to answer the question
Cassie is working on an investigation for science. She mixes a yellow liquid and a solid chemical in a flask. Which answer best describes her results?
A.
A physical change occurred because the substances kept their properties.
B.
A physical change occurred because the liquid turned yellow.
C.
A chemical change occurred because a gas was formed from a chemical reaction.
D.
A chemical change occurred because the liquid was boiled.
PLEASE HURRY
Answer:
C. A chemical change occurred because a gas was formed from a chemical reaction
Answer:
B A physical change occurred because the liquid turned yellow.
What is the mass of sodium (Na) in 50 grams of table salt (NaCl)? Show
your work.
a light particle has the wavelength of 426.2 nm. what is the wavelength in meters
Answer:
0.0000004262m
Explanation:
i just looked up a converter.
3) Which element is the 2s orbital closest to the nucleus?
A) Te
B) Se
C) O
D) Po
E)S