Answer:299,800,000
Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.
Which of the following is the symbol for an element?
Co2
Ch4
C
H2o
6 How many moles are in a 321 g sample of magnesium?
F 13.2 mol Mg
G 13.4 mol Mg
H 13.6 mol Mg
J 13.8 mol Mg
Answer:
13.4mol of Mg
Explanation:
Given parameters:
Mass of magnesium = 321g
Unknown:
Number of moles = ?
Solution:
The number of moles of a substance is given as;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Mg = 24g/mol
Insert the parameters and solve;
Number of moles = [tex]\frac{321}{24}[/tex] = 13.4mol of Mg
Why is the number of electrons or charge of each ion useful information when predicting the products in replacement reactions?
"The number of electrons / charge of each ion tells about the property of the rection either it is single replacement reaction or double replacement reaction."
What is replacement reaction?
Replacement reactions are extremely significant chemistry phenomena. They are employed in a variety of fields. For example, it can employ electroplating, that is reliant on replacement reaction, to keep iron objects from rusting.
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select a paragraph that best explain several ways to identify a chemical change through observiation alone?
A. a chemical change occurs when the composition of a substance is changed. chemical change requires the breaking of forming of chemical bonds during a chemical change. The result in arranging of atoms in substances to form the product of the chemical reaction which becomes brand new molecules. These new molecules cannot be easily research it back to their original state
B. sometimes it is difficult to tell if a chemical reaction has taken place. To help determine whether there has been a reaction, chemists consider a few basic indicators. These include a change in temperature, a change in color or the development of an odor.the formation of a participate or the formation of a gas may also indicate a chemical reaction
C. in a chemical alteration a temperature change occurs as a result of a breaking or formation of a chemical bond. When the chemical bonds of the reactants are broken sometimes excesses energy is released. These can cause he choose to be discharged leading to an increase in temperature . burning wood is an example of a reaction that releases at Energy as heat. A chemical cold pack in a first-aid kit in is an example of chemical reaction that absorbs heat energy rather than releasing it.this result in Cooling.
D. a chemical reaction may also release a gas for example a mix of a vinegar and baking soda will immediately start bubbling and foaming.the bubbles are a release of carbon dioxide gas a product of a chemical reaction between these two households substances
Answer:
ITS A OR B
Explanation:
Which substance in the table below will heat up the fastest? water helium diamond or glass
Answer:
Helium will heat up the fastest
Explanation:
do ionic, covalent and metallic bonds form molecular or ionic compounds? HELP PLEASE I WILL MARK BRAINLIEST
Answer:
Ionic compounds contains ionic bond
Like NaCl
Molecular compounds contains covalent bond like H2O
And metals contains metalic bond like in copper
Explanation:
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Which group has the greatest metallic character?
Answer:
Group 1 metals or the alkali metals
Explanation:
The group 1 elements are all metals except for hydrogen, the first element in the group. Group 1 metals have one valence electron in their outermost shell. The metallic character increases as one goes down the group.
The metallic character of an element is determined by how readily it loses electrons. Elements that lose electrons most easily have the greatest metallic character. Group 1 metals have the greatest metallic character due to the ease with which they donate or lose their one valence electron. As the atomic radius increases on going down the group, their metallic character increases. Also, due to screening effect of the inner electrons on the valence electron from the positive nuclear charge of the nucleus, metallic property increases on going down the group.
how many Nitrogen are in 2AlN
Why do the electron clouds around a central atom stay as far apart as possible?
Electron pairs around a central atom arrange themselves so that they can be as far apart as possible from each other. The repulsion between negatively charged electrons pairs in bonds or as lone pairs causes them to spread apart as much as possible
Explanation:
WORTH 20 POINTS PLZZZ HELP WILL GIVE BRANLIEST PLZZZ
A toaster transforms P energy into Q energy.
What do P and Q most likely represent?
P represents electrical energy, Q represents thermal energy
P represents thermal energy, Q represents electrical energy
P represents chemical energy, Q represents radiant energy
P represents radiant energy, Q represents chemical energy
Answer: P represents electrical energy, Q represents thermal energy.
Explanation: The toaster takes electrical energy from the electrical socket through wires and converts that into thermal energy that heats up/toasts the bread.
Answer:
P represents electrical energy, Q represents thermal energy
Explanation:
I am sorry if I get this wrong, but when I put it in the sentence - A toaster transforms electrical energy into thermal energy - it made sense to me, so I think that is the answer. I am sorry if this does not help.
Argue the importance of chemistry to the field of materials science.
(short answer)
Explanation:
Chemistry, however, plays the primary role in materials science because it provides information about the structure and composition of materials. Materials scientists study the structures and chemical properties of various materials to develop new products or enhance existing ones.
Answer:
the other person is right.
Explanation:
PLEASE HELP.
how many grams of K2SO4 are in 1.18x10^24 atoms?
Answer:
Mass = 331.17 g
Explanation:
Given data:
Mass in gram = ?
Number of atoms of K₂SO₄ = 1.18 × 10²⁴ atoms
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
1.18 × 10²⁴ atoms × 1 mol / 6.022 × 10²³ atoms
0.19× 10¹ mol
1.9 mol
Mass of K₂SO₄:
Mass = number of moles × molar mass
Mass = 1.9 mol × 174.3 g/mol
Mass = 331.17 g
Given the reaction: 4Al + 302 --> 2AI2O3
How many moles of Aluminum oxide do you have if you have 6 moles of AI?
A
6: moles
B: 2 moles
C: 3 moles
D: 12 moles
Answer:
B: 2 moles
Explanation:
that my answer I got i think its correct
In which phase is the moon when in the position shown in the diagram?
A) First-Quarter Moon
B) Full Moon
C) Last-Quarter Moon
D) New Moon
a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice. is what? (its ice something) idk the other word:(
Answer: Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice.
describe the motion of the particals in liquid bromine and bromine gas
The motion of particle of bromine in liquid is less as compared to the gaseous phase.
What is Entropy?Entropy is defined as the motion of particle how randomly a particle move.
Entropy is also defined as the no. of particle per unit surface area.
In liquid phase, the number of particle per unit surface area is greater. The particle are closer with each other through the intermolecular force of attraction. Due to which randomness of particle decreases. Hence motion of particles decreases.
In gaseous phase, the number of particle per unit surface area is lesser. The particle are less closer with each other and have less intermolecular force of attraction. Due to which randomness of particle increases. Hence, motion of particles increases.
Thus, we concluded that the motion of particle of bromine in liquid is less as compared to the gaseous phase.
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Why is oxygen heavier than air?
Answer:
Oxygen is denser
Explanation:
Oxygen is denser than both air and nitrogen, at all temperatures and pressures, but only slightly. Since they don't separate from each other, we generally don't worry which is lighter or heavier. The difference in the density of nitrogen and oxygen gas comes from their molecular weight, which is small (4 g/mol)
Answer:
Oxygen is denser than air.
Explanation:
This is because oxygen gas comes from its molecular weight. Also air is mainly made up of nitrogen and nitrogen is lighter than oxygen.
The density of liquid Z is 0.9327 g/mL. A student masses a cup with a sample of liquid Z in it and finds the mass to be 50.7 g. The mass of the cup alone is 15.92 g. What is the volume of liquid Z in the cup? (Volume = mass/density)
Answer:
Try doing this: 50.7/.9327 for the answer.
What occurs to the kinetic energy when the mass moving object is doubled?
Answer:
Kinetic energy increases.
Explanation:
Kinetic energy is energy you get from moving. The equation for KE depends on mass as well as velocity. If you increase one of these factors, KE will increase too.
What product is formed when benzene is treated with the following organic halide in the presence of alcl3? click the draw structure button to launch the drawing utility.
Cumene is the end result of the reaction between benzene and 2-chloropropane when aluminum chloride is present.
Alkylation serves as an example of replacing the "alkyl group on the aromatic ring." In the alkylation reaction, the term "alkyl halides" is important. The "Lewis acid" suggested an alkylation catalyst.
Cumene is produced when the benzene molecule interacts with 2-chloropropane in the presence of aluminum chloride. By losing chlorine, the 2-chloropropane combines with aluminum chloride to produce a carbocation. Cumene is produced by further attacking benzene and protonating it.
Below is an attachment showing the cumene generation reaction.
Cumene is the end result of the reaction between benzene and 2-chloropropane when aluminum chloride is present.
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pls i need #2 !!!!!!!!!!
Answer:
answer c aka it is cheaper than other elements
Answer:
because it's cheap and not hard to purify
Solid strontium chromate, SrCrO4, dissolves into its respective ions at 25°C. Suppose that in a particular solution,
[Sr2+] = 6.0x10-3 M.
Find the value of Ksp.
A. 3.6 x 10-5
B. 6.0x10-3
C. 3.6 x 10-2
D. 7.7x10-2
Answer:
I think it's d but I'm not positive
Answer:
A
Explanation:
Can you help give examples of elements, compounds, and mixtures? My friend is having trouble with it.
Answer:
Elements are all the subtances on the periodic table. Compound are elements that are fused by chemical means like potassium chloride. Mixture are elements that are not chemically fused but just in a sense mixed together.
How many moles of water would you have if you had 3x10^24 molecules of
water? (round to the nearest whole number) *
Your answer
Which elements from the periodic table are the least reactive?
A noble gases
B transition metals
C lanthanides
Dmetalloids
Answer:
Noble games are the least reactive because their outer shells are already full with 8 electrons.
Which element does not like to bond with other atoms?
1 - sodium
2 - chlorine
3 - carbon
4 - xenon
Answer:
Xenon
Explanation:
The reason is because, Xenon is a part of a Group on the periodic table called Noble Gases. This means that it has 8 electrons on its outer shell, making it very hard to get a reaction out of it.
Which of the following is an example of a covalent compound?
Answer:
CCI2
Explanation:
You shoot a beam of 4.5 eV light at a metal surface and notice that electrons are being
released from the metal. What will happen if you then increase the intensity of the 4.5
eV light?
O The metal will bend and warp.
O Nothing, the energy of the light is the same.
O More electrons would be released.
Photons would come off at higher speeds.
If you then increase the intensity of the 4.5 eV light, you will notice that the photons would come off at higher speeds.
What is intensity of light?
Light intensity refers to the strength or amount of light produced by a specific lamp source.
Intensity of light measures of the wavelength-weighted power emitted by a light source.
Mathematically, the intensity of light source is given as;
I = P/A
where;
P is the power of the incident light (photon energy per second )A is the unit areaIncreasing the light intensity (photon energy per second per unit area) increases the rate at which electrons leave the metal, and the electrons have more kinetic energy.
Thus, if you then increase the intensity of the 4.5 eV light, you will notice that the photons would come off at higher speeds.
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Which of the following is considered a compound?
1) N2
2) Na
3) BF3
40 points.
9. Key Concept How do measurements relate to
experimental science?
10. Key Concept How are accuracy and precision
evaluated?
11. Key Concept Why must a given measurement
always be reported to the correct number of significant figures?
12. Key Concept How does the precision of a calculated answer compare to the precision of the
measurements used to obtain it?
13. A technician experimentally determined the
boiling point of octane to be 124.1°C. The actual
boiling point of octane is 125.7°C. Calculate the
error and the percent error.
14. Determine the number of significant figures in
each of the following.
a. 11 soccer players
b. 0.070 020 meter
c. 10,800 meters
d. 5.00 cubic meters
15. Solve the following and express each answer in
scientific notation and to the correct number of
significant figures.
a. (5.3 104) (1.3 104)
b. (7.2 104) (1.8 103)
c. 104 103 106
d. (9.12 101) (4.7 102)
e. (5.4 104) (3.5 109)
9. Making correct measurements is fundamental to the experimental sciences.
10. Accuracy is the measured value compared
to the correct values. Precision is comparing more than one measurement.
11. The significant figures in a calculated
answer often depend on the number of
significant figures of the measurements
used in the calculation.
12. A calculated answer cannot be more precise than the least precise measurement
used in the calculation.
13. error = –1.6°C; percent error = 1.3%
14. a. unlimited
b. 5
c. 3
d. 3
15. a. 6.6 × 104
b. 4.0 × 10–7 c. 107
d. 8.65 × 10–1
e. 1.9 × 1014
Answer: number 9 is: Measurements are fundamental to experimental science. Number 10 is: To evaluate the accuracy of a measurement, the measured value must be compared to the correct value. To evaluate the precision of a measurement, you must compare the values of two or more repeated measurements. Number 11 is: Measurements must always be reported to the correct number of significant figures because calculated answers often depend on the number of significant figures in the values used in the calculation. Number 12 is: Usually a calculated answer cannot be more precise than the least precise measurement from which it was calculated. Number 13 is: 125.7−124.1=1.6 125.7 − 124.1 = 1.6 degrees Celsius. Number 14 is: a. 11 soccer players- 2 SF b. 0.070 020 meter- 5 SF c. 10,800 meters- 5 SF
d. 5.00 cubic meters- 1 SF.
Number 15 is: A)
Number of significant figures = 2
B)
Number of significant figures = 2
C).
Number of significant figures = 1
D).
Number of significant figures = 3
E).
Number of significant figures = 3
Explanation: