Answer:
D.Mixture
Explanation:
When Salt dissolves in water a homogeneous mixture is formed, because the different components are mixed evenly within the substance.
Dribbling a basketball harder into the floor makes it bounce higher is an example of what newton's law?
How is the temperature scale different than a typical thermometer?
A student collected a 1.28 g sample of Magnesium. How many atoms of Mg are in his sample?
A student did an experiment that called for 1.24 x 1024 molecules of CaO. What is the mass of her reactant?
A student reacted 0.0405 g of glucose (C6H12O6). How many molecules of glucose did he react?
A digital camera stores images as
A.
digital information.
B.
light.
C.
analog images.
D.
all of these
Answer: A) digital information.
Data is stored in binary fashion as 1s and 0s. If you string enough of them together, you can convey many forms of messages. If you send a message to some kind of storage medium (such as a hard drive or flash drive), then you can retrieve that message at a later date. In effect, you're sending a message to yourself, more or less. By "message", I mean the information about each pixel color that forms the entire image.
In contrast, an analog camera or film camera stores images on film that is to be processed at a later time. Though something like polaroid cameras develop the image fairly quickly without need of a darkroom. Both analog and digital methods involve the use of light to capture the image, and this is true about our eyes needing light as well just to see in general. However, light itself isn't used as a storage method.
Many organisms on Earth exhibit similar ____________.
Question 1 options:
time
single-celled
characteristics
nonliving
Answer:
characteristics
Explanation:
i promise becasue i am a teacher so i hope you like it
Need help asap!
1. Given that the electronegativity of sulfur (S) is 2.5 and that of silicon (Si) is 1.8, which of the following best describes the chemical bonding in silicon monosulfide (SiS)?
A. ionic: transfer of electrons from silicon to sulfur
B. nonpolar covalent: equal sharing of electrons between silicon and sulfur
C. polar covalent: electrons shared between silicon and sulfur but attracted more to the sulfur
D. polar covalent: electrons shared between silicon and sulfur but attracted more to the silicon
2. Which of the following is a molecular compound?
A. Mg3N2
B. NH3
C. AlCl3
D. LiBr
3. Potassium (K) reacts with a certain nonmetallic element (Z) to form a compound with the general formula KZ; where element Z is a diatomic gas at room temperature. What is element Z?
A. Oxygen
B. Fluorine
C. Nitrogen
D. Hydrogen
Answer: 1. C. polar covalent: electrons shared between silicon and sulfur but attracted more to the sulfur
2. B) [tex]NH_3[/tex]
3. B) Fluorine
Explanation:
1. A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms.
Electronegativity difference = electronegativity of sulphur- electronegativity of silicon = 2.5 -1.8 = 0.7
Thus as electronegativity difference is less than 1.7 , the cond is polar covalent and as electronegativity of sulphur is more , the electrons will be more towards sulphur.
2. A molecular compound is usually composed of two or more nonmetal elements. Example: [tex]NH_3[/tex]
Ionic compound is formed by the transfer of electrons from metals to non metals. Example: [tex]Mg_3N_2[/tex] , [tex]AlCl_3[/tex] and [tex]LiBr[/tex]
3. For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here K is having an oxidation state of +1 and as the compound formed is KZ, the oxidation state of non metallic element Z should be -1. Thus the element Z is flourine which exists as diatomic gas [tex]F_2[/tex]
Jill graphs the speed of a model train that is travelling at a speed of 15 kilometers per hour. Which graph shows the speed of the model train?
Answer:c
Explanation:
What is creating our Earth's Magnetic field?
1) Our Earth's iron liquid outer core rotating around the solid inner core
2) Our Earth having a stationary inner core
3) Our Earth having rocky center
4) All of the above
Answer:
1) Our Earth's iron liquid outer core rotating around the solid inner core
Explanation:
The earth's magnetic field or the geomagnetic field is produced as a result of the earth's iron liquid outer core rotating around the solid inner core.
This produces the earth's magnetic field.
The earth's core is made up of solid and liquid region. Only the densest elements are found within this region. So, the core is made up of metals which are mainly iron and nickel. The outer core is liquid or molten iron and the inner core is solid. The molten iron and nickel in the outer core moves around the inner core and generates the currents which induces a magnetic field round the earth.What is MnF3 + AL ? If anyone would
Be so kind
ammonium phosphate is an important ingredient in many solid fertilizers. It can be made by reacting aqueous phosphoric acid with liquid ammonia. Calculate the moles of ammonium phosphate produced by the reaction of 2.4 mol of ammonia. Be sure your answer has a unit symbol, if necessary, and round it to significant digits.
Answer:
0.57 moles (NH4)3PO4 (2 sig. figs.)
Explanation:
To quote, J.R.
"Note: liquid ammonia (NH3) is actually aqueous ammonium hydroxide (NH4OH) because NH3 + H2O -> NH4OH.
H3PO4(aq) + 3NH4OH(aq) ==> (NH4)3PO4 + 3H2O
Assuming that H3PO4 is not limiting, i.e. it is present in excess
1.7 mol NH4OH x 1 mole (NH4)3PO4/3 moles NH4OH = 0.567 moles = 0.57 moles (NH4)3PO4 (2 sig. figs.)"
Analysis of an unknown substance indicates that it is a brittle solid. It acts as an electrical insulator (does not conduct) as a solid but conducts electricity when melted. Which of the following substances would have these characteristics?
a. HCl
b. Al
c. KBr
d. SiF4
e. I2
Answer:
KBr
Explanation:
A metal has a very high melting point. Aluminum is a metal.
Ionic solids do not conduct electricity in the solid state. However, when the solids are melted, they conduct electricity.
KBr is an ionic substance, it can only conduct electricity in molten form because the ions are locked up in the solid.
Sulfur dioxide, SO2, is used in wine as an antioxidant, slowing the oxidation of ethanol
to ethanoic acid. To determine the SO2 content of a wine sample, sodium hydroxide
and sulfuric acid were added to ensure that all sulfur was present as SO2. A 20.00 mL
aliquot was then titrated against standardised iodine solution, using starch indicator.
Reaction occurred according to the equation:
SO2(aq) + 2H2O(l) + 12(aq) → 4H+ (aq) + 21- (aq) + SO42- (aq)
The end point was reached with 15.62 mL of 0.00501 M iodine solution. The
concentration (in M) of SO2 in the wine was ...
A)6.2 x 10-3
B)7.8 x 10-3
C)3.9 x 10-3
D)5.0 x 10-3
The concentration (in M) of SO₂ in the wine : c. 3.9 x 10⁻³
Further explanationGiven
Reaction
SO2(aq) + 2H2O(l) + I2(aq) → 4H+ (aq) + 21- (aq) + SO42- (aq)
Required
The concentration (in M) of SO2
Solution
Titration ⇒ mol SO₂ = mol iodine(I)
mol iodine :
=15.62 ml x 0.00501 M
=0.078256 mlmol
From equation, mol ratio of of SO₂ : I₂ = 1 : 1, so mol SO₂=0.078256
The concentration of SO₂(in 20 ml sample) :
M = n/V
M = 0.078256 mlmol/20 ml
M = 0.0039128
M = 3.9 x 10⁻³
What is true about atomic radius trends on the periodic table?
A. Atomic radius decreases along periods and decreases down groups.
B. Atomic radius decreases along periods and increases down groups.
C. Atomic radius increases along periods and decreases down groups.
D. Atomic radius increases along periods and increases down groups.
It is not b
Answer:
D
Explanation:
Just took the test, Hope this helps!
Answer:
B. Atomic radius decreases along periods and increases down groups.
Explanation:
It decreases in period because of addition of proton effective nuclear charge increase and atomic radius decreases.
Atomic radius increases in group because of addition of shells
use scientific notation to solve
Which chemical equation is unbalanced?
C + O2 Right arrow. CO2
Sr + O2 Right arrow. 2SrO
6H2 + 3O2 Right arrow. 6H2O
H2 + H2 + O2 Right arrow. H2O + H2O
Answer:
Sr + 02 Right arrow.2Sr0
Answer:
b
Explanation:
An idea based on observations with no experimental evidence is a:
Measure that affects the thermal energy of matter but not it's temperature.
Answer: mass
Explanation:
What is the kinetic energy of a ball when it stops moving?
Question 2 options:
3
2
1
Answer:0
Explanation:
What is the frequency of a photon that has a wavelength of 6.58 x 10-8m?
Answer:
6 x 10 (power to the 15) H2
Answer:
i dont know the answer but you could search up photon calculator, hope this helps (im very sorry i couldnt help but i havent learned about that yet, im in 9th grade)
Which of the following is NOT a factor in how much voltage is produced by a
generator?
How fast the magnet in the generator is moving through the coiled wire
How many amps are run through the electromagnet of the generator
How strong the magnet in the generator actually is
How many times the wire is coiled in the generator....
Answer:
How fast the magnet in the generator is moving through the coiled wire
Explanation:
Another name for an electric generator is the electric motor. It is a device that is used to convert mechanical energy into electrical energy.
It comprises of a rectangular coil of insulated wire called armature which rotates about a fixed axis. Powerful magnets provides the required magnetic field. A commutator made of split ring copper and two carbon brushes are attached to it.
The voltage produced by the electric motor depends on;
i) The strength of the magnetic field.
ii) The number of turns of the coil
iii) The current across the armature
8. How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?
A) 0.8452
B) 1.183
C) 6.022 x 1023
D) 8.648 x 1023
E) 3.134 x 1025
Answer:
B) 1.183
Explanation:
To convert from grams (mass) to moles, we need to divide by the atomic mass (amu)..
The amu of [tex]CO_{2}[/tex] is 44.008
52.06/44.08 = 1.182966733
This can be rounded to 1.1830 moles of CO2
1.183 moles of carbon dioxide are there in 52.06 g of carbon dioxide.
Explanation:
Moles of substance are defined ratio of the given mass of the substance to the molar mass of the substance.Given :
The 52.06 grams of carbon dioxide.
To find :
The moles of carbon dioxide.
Solution:
The mass of carbon dioxide = 52.06 g
The molar mass of carbon dioxide = 44.01 g/mol
The moles of carbon dioxide:
[tex]=\frac{52.06 g}{44.01 g/mol}=1.183 mol[/tex]
1.183 moles of carbon dioxide are there in 52.06 g of carbon dioxide.
Learn more about the number of moles here:
brainly.com/question/16192776?referrer=searchResults
brainly.com/question/2293228?referrer=searchResults
Identify which element is the least malleable: potassium, calcium, scandium, or titanium
__HgO __Hg + __O2 what is the reaction
Answer:
2HgO <---- 2Hg + O2
Explanation:
Red blood cells are constantly being produced in your body. Another body system cooperates with the cardiovascular system in the production of these cells. What is this system and how does it cooperate?
HELPPP PLEASE
Calculate the mass of beryllium (Be) needed to completely react with 18.9 g nitrogen gas (N2) to produce Bez N2, which is the only product of the reaction.
A. 6.19
B. 12.29
C. 18.29
D. 36.69
Answer:
Mass = 18.29 g
Explanation:
Given data:
Mass of beryllium needed = ?
Mass of nitrogen = 18.9 g
Solution:
Chemical equation:
3Be + N₂ → Be₃N₂
Number of moles of nitrogen:
Number of moles = mass/molar mass
Molar mass of nitrogen = 28 g/mol
Number of moles = 18.9 g/ 28 g/mol
Number of moles = 0.675 mol
Now we will compare the moles of nitrogen and Be.
N₂ : Be
1 : 3
0.675 : 3/1×0.675 = 2.03 mol
Mass of Be:
Mass = number of moles × molar mass
Mass = 2.03 mol × 9.01 g/mol
Mass = 18.29 g
Which statement best describes the polarity of SF 4 CI 2?
Always polar , always non polar or depending on the arrangement of outer atoms ?
Answer:
use common sense!........
What type of weather typically results from a low pressure system?
I need help!!!!
Answer:
Storms and hurricanes can be formed with low pressure. It always results into unsettled weather.
Explanation:
Hope this helps!
PLZ HELP IT BEING TIMED!!!!!! PLZ ANSWER!!!!!
Answer:
YIKES. a bit late. Answers include 1, 2, 3
Explanation:
What is the correct name of CUCIO2
Chemistry
Answer:
Copper(II) Chlorite = Cu(ClO2)
Explanation:
how you write the compound is very important as well
A parallel circuit contains four identical lamps. The current through the energy source is 4 A. The total resistance of the circuit is 10 Ω. What is the voltage across the energy source and across each lamp
Answer:
a parallel circuit has two or more paths for current to flow through voltage is the same across each component of the parallel circuit the sum of the current through each path is equal to the total current that follows from the source another definition is in a parallel circuit all components are connected across each other formally exactly two sets of electricity common points a branch in a parallel circuit in a path of electricity current formed by one of the load component