Answer:
15
Explanation:
Answer:
50 km/h
Explanation:
Since in half an hour it has gone 25km, double that (25 x 2) and you get your answer in km/h. Therefore, the train is going 50km/h.
For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf
overnight. The next morning, the students recorded observations about the metal and the solution in the box below.
Students' Observations
Exhibit
. The solution is lighter in color,
The volume of solution is the same.
• The metal strip is shiny above the surface of the solution
• The metal strip is not shiny below the surface of the solution.
• The metal strip below the surface of the solution has a dark
coat of flaky material
• When the metal strip is touched, the flaky material falls off.
Based on their observations, can the students correctly conclude that a chemical reaction occurred?
A. No, because the metal strip was still visible
B. Yes, because a new material of a different color formed on part of the metal strip
c. No, because the solution stayed blue
ble solution stayed the same
12 AM
Answer:
It is b
Explanation:
Yes, because a new material of a different color formed on part of the metal strip.
What is a Chemical reaction?When atoms establish or break chemical bonds, chemical processes take place. Reactants are substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction. Until the reactants are exhausted, some chemical reactions merely proceed in one direction. It is claimed that these responses are irreversible. Some responses are categorized as reversible. Reactions that are reversible can occur both forward and backward. Reactants change into products in a reversible reaction, but products can also change back into reactants. In actuality, both the forward response and its reverse will occur simultaneously. This oscillation lasts until a particular relative balance between reactants and products is attained a condition known as equilibrium. The forward and backward processes continue to occur at equilibrium, but there is no longer any change in the relative concentrations of products and reactants.
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Why are prefixes used in naming covalent compounds?
A. The prefixes identity the only way the atoms can combine.
B. The same atoms can combine in more than one ratio.
C. The atoms can have different numbers of valence electrons
D. Oxidation states of the atoms are identified with prefixes
Answer:
B
Explanation:
The same atoms can combine in more than one ratio.
The same atoms can combine in more than one ratio. Hence, option B is correct.
What is a covalent bond?A covalent bond shares one or more pairs of electrons between two atoms.
Covalent bonds are the bond between non-metals that are linked together by shared electrons. Covalent compounds are named with different prefixes to identify the number of atoms in the molecule.
Hence, option B is correct.
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can u help me with my science problems
Answer:
what is the question
Explanation:
what do you need help with
Which compound contains nitrogen with an oxidation number of +3?
Answer:
Nitrous Acid [tex]N_{2}O_{3}[/tex]
Nitrogen is in the +3 oxidation state in N2O3. Nitrous acid is a weak acid.
The compound contains nitrogen with an oxidation number of +3 is N₂O₃ and nitrous acid HNO₂. Nitrous acid is a weak acid.
What do you mean by oxidation state ?The term oxidation state is defined as the total number of electrons that an atom either gains or loses in order to produce a chemical bond with another atom. The oxidation state is also called as oxidation number.
The formula for calculating oxidation states would be : The Highest Oxidation State for a Transition metal = Number of Unpaired electrons + Two s-orbital electrons.
The compound contains nitrogen with an oxidation number of +3 is N₂O₃ because it can acquire three electrons to form a chemical bond and to complete its outermost orbit (octet).
Thus, The compound contains nitrogen with an oxidation number of +3 is N₂O₃ and nitrous acid HNO₂.
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What is a Physical reaction?
If you worked at a job for 9.00/hour, what type of correlation is the number of hours worked and your take-home pay?
Answer:
There is a linear correlation between the number of hours worked and take-home pay. And more exactly, a direct proportionality. [tex]C = 9\cdot t[/tex]
Explanation:
From statement we deduce that amount of hours worked ([tex]t[/tex]) (Independent variable, measured in hours) is directly proportional to take-home pay ([tex]C[/tex]) (dependent, measured in monetary units), since proportionality ratio is constant and, therefore, there exists a linear correlation between both variables. That is:
[tex]C \propto t[/tex]
[tex]C = k\cdot t[/tex] (Eq. 1)
Where [tex]k[/tex] is the proportionality ratio, measured in monetary units per hour. If we know that [tex]k = 9\,\frac{m.u.}{h}[/tex], then the resulting correlation is:
[tex]C = 9\cdot t[/tex]
There is a linear correlation between the number of hours worked and take-home pay.
which of the following lists contains only elements?
A ) air , water,oxygen
b) hydrogen, oxygen, brass
c) air , fire , water, earth
d) calcium, sulphur, carbon
(fill the blank)
The sex cells produced through meiosis each have ___.
A. half of the chromosome pairs from the original cell
B. a single chromosome from the original cell
C. pairs of chromosomes identical to the original cell
D. one chromosome from each pair in the original cell
Answer: A (Half of the chromosome pairs from the original cell
Explanation:
PLEASE ANSWER
A train travels 200 miles at an average speed of 50 miles per hour. How long does it take the train to travel this distance?
who Organized elements into four groups based on propertie
In order for radiation to transfer heat
Answer:
Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation. This is a type electromagnetic radiation
Answer:
Heat can be transmitted through empty space by thermal radiation often called infrared radiation
Explanation:
Brainliest???? Plzzz!!!
Calculate the density of an object using the following information: Mass = 50 grams and the initial water level is 30-ml in a graduated
cylinder, but rose to 40-ml after the object was dropped into it.
The density of an object = 5 g/ml
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Mass = 50 g
Volume of the object =
[tex]\tt 40-30=10~ml[/tex]
So the density :
[tex]\tt \rho=\dfrac{50}{10}\\\\\rho=\boxed{\bold{5~g/ml}}[/tex]
compare and contrast gymnosperms and angiosperms
(JSYK: this is technically biology)
Anyways, a gymnosperm is a plant (usually a tree) that has unprotected seeds, this means it bears no fruits and can include (but are not limited to) connifers, cycads, and the ginko. Angiosperms produce flowers to help fertilization and have protected seeds. They are also likely to produce fruits or vegetables.
Hope this helps, if not, comment down below please!!!
You will analyze four substances in this lab. Based on their chemical formulas and what you already know about covalent and ionic compounds, make a prediction for each compound.Cornstarch, a carbohydrate consisting of hydrogen, carbon, and oxygen
Answer:
Oil: covalent
Cornstarch: Covalent
Sodium chloride: Ionic
Sodium bicarbonate: Ionic
Explanation:
Covalent compounds are formed by sharing of electrons between non metals whereas ionic compounds are formed by transfer of electrons from metals to non metals.
1. Oil, which is built from the nonmetals hydrogen, carbon, and oxygen: forms a covalent compound by sharing of electrons between non metals hydrogen, carbon, and oxygen. Covalent compounds are insoluble in water.
2. Cornstarch, a carbohydrate consisting of hydrogen, carbon, and oxygen: forms a covalent compound by sharing of electrons between non metals hydrogen, carbon, and oxygen. Covalent compounds are insoluble in water.
3. Sodium chloride (table salt), whose formula is NaCl is formed by transfer of electrons from sodium to chlorine.Ionic compounds are soluble in water.
4. Sodium bicarbonate, whose formula is is formed by transfer of electrons from sodium to .Ionic compounds are soluble in water.
Answer:
Oil, which is built from the nonmetals hydrogen, carbon, and oxygen:
covalent
Cornstarch, a carbohydrate consisting of hydrogen, carbon, and oxygen:
covalent
Sodium chloride (table salt), whose formula is NaCl:
ionic
Sodium bicarbonate (sodium bicarbonate), whose formula is NaHCO3:
ionic
Explanation:
How many days will pass between a new moon and a full moon?
Answer:
30
Explanation:
im smart
Answer:
The longest duration between full moon to new moon (or new moon to full moon) lasts about 15 days and 14.5 hours, while the shortest duration between full moon to new moon (or new moon to full moon) lasts only about 13 days and 22.5 hours. New Moon appears higher on summer solstice than on winter solstice.
which sample is a pure substance?
a. a test tube of zinc oxide
b. a container of zinc and oxygen
c. a flask of pond water
d. a jar of soil
Answer:
The answer is A. Test Tube of zinc oxide
The solution starts with increased ________________
Answer:
Concentration
Explanation:
Answer:
concintracion
Explanation:
POSSIBLE POINTS: 26.67
Match the seasons for the Northern Hemisphere, Winter, Spring Summer, Fall to the different points on the diagram
Answer:
vv
Explanation:
Point A: Summer
Point B: Fall
Point C: Winter
Point D: Spring
Which of the following is not a gas in the Earth's atmosphere? A. oxygen B. carbon dioxide C. sulfur D.nitrogen 1
You are out on a hike, and you notice that the line of telephone wires you have been following along a slope is crooked. Two of the posts are much farther down slope then the others. What has likely occurred on this hillside?
Answer:
The awnser is creep
Explanation:
There don't appear to be any dial tone problems on the telephone caused by broken wires, connectors, wall jacks, or other network-interfering hardware.
What is hardware ?Hardware describes the physical parts of the computer or its delivery mechanisms for the software's written instructions to be stored and executed. The device's intangible component that enables user interaction with the hardware is called the software.
Software is referred to as "soft" because it is flexible, but hardware is referred to as "hard" because it is rigid in terms of modifications. Software often instructs hardware to carry out any command.
Since a smartphone is fundamentally a small computer, it has several parts in common with computers, such as processors and memory. It's critical to balance your demands on this hardware because these components are continuously improved in new phone generations.
Thus, It doesn't seem that any broken wires, connectors, wall jacks, or other network-interfering gear are the root of any dial tone issues on the hardware.
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¿Qué podría pasar si la fuerza fuerte no existiera?
Answer:
andariamos flotando
Explanation:
I need help what is the Find the value of x
Answer:
45 degrees
Explanation:
as you can see, the box in the corner states that both the angles together are 90 degrees, and half of that is 45. 90/2=45
what is extremely lightweight and exists in a cloud orbiting the nucleus
Answer:
atomic particles
Explanation:
electrons are extremely lightweight and exist in a cloud orbiting the nucleus period the electron cloud has a radius 10,000 times greater than the nucleus according to the Los Alamos national laboratory.
FIRST TO ANSWER CORRECTLY GETS BRAINLIEST!
Answer:
Quito is the one..
HELP ASAP WILL MARK BRAINLIST The diagram below shows what happens during the formation of a compound. The diagram shows two substances joining together to form a third substance.
Which of these substances is a compound?
Group of answer choices
C
A
B
Both B and C
Answer:
C is the answer..
The equation is showing how it is formed, so the answer is on the other side of the equal sign.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, diagram C shows the final compound.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The diagram below shows what happens during the formation of a compound. The diagram shows two substances joining together to form a third substance. Diagram C shows the final compound.
Therefore, diagram C shows the final compound.
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What are the different parts of a comet?
Answer:
the nucleus, the coma, the ion tail, and the dust tail
Explanation:
A comet is made up of four visible parts: the nucleus, the coma, the ion tail, and the dust tail. The nucleus is a solid body typically a few kilometres in diameter and made up of a mixture of volatile ices (predominantly water ice) and silicate and organic dust particles.
6. How is energy transferred to the earth?I
Answer:
Energy is transferred between the earths surface and atmosphere.Energy move place to place
Look for other families of ions in the table that follow a pattern similar to that of the polyatomic chlorine ions. Then complete the statement to describe what you find. Select the correct answer from each drop-down menu. Families of ions that contain hydrogen pattern similar to that of the polyatomic chlorine ions. then complete the statement to describe what you find
Answer: Families of ions that contain NITROGEN, SULFUR, and CARBON follow a pattern similar to that of the polyatomic chlorine ions.
Explanation: Plato
Answer:
Answer: Families of ions that contain NITROGEN, SULFUR, and CARBON follow a pattern similar to that of the polyatomic chlorine ions.
Explanation: Plato
Solids are usually: equal in density to other phases more dense than liquids less dense than gases
Answer:
more dense than liquids
Explanation:
state two advantages of parallel over series connection in table form?
Advantages of parallel combination over series combination are:
1) In parallel combination each appliance gets the full voltage.
2) If one appliance is switched on/of others are not affected.
3) The parallel circuit divide the current through the appliances. Each appliance gets proper current depending on its resistance.
4) In a parallel combination it is very easy to connect or disconnect a new appliance without affecting the working of other appliances.
choose what you like!
Note that there are also some disadvantages to using parallel connections over series connections, such as increased complexity in wiring and the need for additional safety measures when working with high voltage circuits. The choice between series and parallel connections depends on the specific requirements of the circuit and the devices being used.