I am an element in period 4 with 7 valence electrons.
Answer:
The elements in this family are fluorine, chlorine, bromine, iodine, and astatine. Halogens have 7 valence electrons, which explains why they are the most active non-metals.
Explanation:
Answer:
Selenium
Explanation:
Does the following statement describe revolution or rotation?
When it is daytime in one area of the world it is nighttime on the opposite side of the world,
A)Rotation
B)Revolution
Answer:
this describes rotation
Explanation:
rotation means spinning on an axis, revolution means going in a circle around an object. a year would be a revolution and a day would be a rotation.
HELPPPPPPPPPPP HELPPPPP HELP
Answer:
calcium chloride and water
Explanation:
the reaction absorbed energy which means endothermic
heat alwais moves from ____ to _____.
Answer: left to right
Explanation:
Jamal's class is observing how different substances are affected by physical and chemical changes. What evidence might indicate that a chemical
change has occurred? Choose the three correct answers.
A. release of heat
B. change in temperature
С. color change
D. new smell
The change in color might indicating the formation of a new product. Hence, the color change indicates a chemical change.
What is chemical change ?A chemical change involves the breaking/ making or both of chemical bonds. Chemical changes results in formation of new products that have different properties and structure from the initial substances.
A physical change include change in size, shape, state etc. All phase changes such as melting, boiling, freezing are physical changes. Evolution or absorption of heat, conductivity, solubility etc are physical changes.
A change in color indicates that a new product with different color is formed in the system. Therefore, option c color change indicates a chemical change.
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Find a periodic table and look for the atomic mass of sodium, Na. What is it?
Answer:
Atomic mass: 22.989769 u
Explanation:
Please help me I don’t understand
The movement of broken down pieces of rock from one place to another is called
A. Deposition
B. Erosion
C. Weathering
D. Sediment
Answer:
The answer I believe is B. Erosion
Explanation:
Just sounds better than all the other choices.
Answer:
erosion b
Explanation:
it breaks down the rocks i remembered this in 4th grade :)
Please help I will give brainliest
Answer:
Explanation:
c. - vaccine
b. - immunity
d. - phagocyte
f. - b cell
e. - t cells
a. active immunity
revolver features several firing chambers located within...
Answer:
What are the characteristics of a revolver?
Explanation:
The revolver features several firing chambers located within a revolving cylinder. The cylinder rotates as the revolver is fired, lining up each bullet mechanically.
Something that is made out of natural resources for human use is called
Answer: Man Made Resources?
Explanation: Its when humans create their own things.
How many moles of a gas sample are in a 5.0 L container at 373 K and 203 kPa?
0.33 mole
0.66 mole
1.11 moles
3.05 moles
Answer:0.33
I'm not sure tho
Answer:
0.33
I just took the test.
Which of the following best describes the Earth's movement around the sun?
A)The Earth is closer to the sun in Summer than in Winter.
B)The Earth moves in a circular pattern around the Moon
C)The Earth's axis moves back and forth, resulting in different seasons
D)The Earth moves in an elliptical orbit around the sun
Answer:
D)The Earth moves in an elliptical orbit around the sun
The statement earth moves in an elliptical orbit around the sun best describes the movement of earth around the sun.
What is earth?Earth is the third planet of the solar system and the only astronomical object known to support life.
What is an elliptical orbit?When an object moves around another object in an oval shaped path, it is known to be revolving in an elliptical orbit.The orbit is elliptical because of Newton's law of gravity.The planets in the solar system orbit the sun in elliptical orbits. Many satellites orbit the Earth in elliptical orbits as does the moon.The movement of the earth around the sun in a fixed path or orbit is called Revolution. The axis of the earth which is an imaginary line, makes an angle of 66½° with its orbital plane.
Hence, option D is the correct answer.
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True or false; when something heats up, New energy is created, and when something cool down, Energy is destroyed.
Answer:
This is false.
Explanation:
This statement directly opposes the first law of thermodynamics which states that energy can neither be created nor destroyed, but can transfer from one source to another.
The general oxidation of a metal ( M ) by a copper ion ( Cu2+ ) is M(s)+Cu2+(aq)⟶M2+(aq)+Cu(s) All the listed metals can be oxidized by Cu2+ ions but the reactions will occur at different rates. Arrange the metals based on how quickly each oxidation by Cu2+ ions should occur.
Answer:
Ba, Ca, Mn, Ni
Explanation:
The sum of the atomic masses for any compound is the compound’s:
Empirical mass
Compound mass
Atomic mass
Molar mass
What is the total amount of heat energy, in
joules, absorbed by 25.0 grams of water when the
temperature of the water increases from 24.0°C to
36.0°C?
Answer:
0.84
Explanation:
total heat energy =mass ×specific heat capacity (4.2kJ)×temp change
mass=25g convert to kg to get 0.025
specific heat capacity is 4.2
temp change=36.0-24.0=8.0
q = mC∆T
m=25.0
c=24.0
ΔT=36.0
25.0 * 24.0 * 36.0 = 21,600 jules
The equation q = MC ∆ T, where m is the sample mass, c is the specific heat, and ΔT is the temperature change, can be used to determine the amount of heat acquired or lost by a sample (q).
How can you figure out how much energy was consumed?
This is simple to perform; to calculate the amount of heat absorbed, multiply the substance's heat capacity by its mass and the temperature change.
The specific heat capacity of a substance is the amount of energy needed to raise the temperature of 1 gram of that substance by 1 degree Celsius. With a value of 4.18 J/g/°C, water has one of the highest heat capacities.
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a train is climbing a gradual hill. the weight of the train creates a downhill force of 150,000 newtons. friction creates an additional force of 25,000 newtons acting in the same direction (downhill). how much force does the train's engine need to create so the train is going uphill at a constant speed?
Answer:
25000 is the answer
Explanation:
The answer is 25000 hope this helps you
25,000N is the total force, the train's engine need to create so the train is going uphill at a constant speed.
What is force?A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it can be a push or perhaps a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force (formerly P).
The net force exerted on an object approximately equal to the rate where its momentum varies over time, according to the original formulation of Newton's second law.
The force by the train weight Fw= 150,000N
The force creates by the friction Ff=25,000N
total force =Fw + Ff
= 150,000N+25,000N
= 25,000N
Therefore, 25,000N is the total force.
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Why is nuclear energy considered a nonrenewable resource?
Nuclear radiation does not run out.
It comes from radiation from the sun.
Uranium ore is replaced on a geologic timescale.
Uranium replenishes more quickly than it is being used.
Answer:
You could classify nuclear energy as nonrenewable because uranium and similar fuel sources are finite. On the other hand, some people consider nuclear energy renewable because the element thorium and other new technologies may provide infinite fuel needed to power nuclear reactors.
Does the following compound contain a polyatomic ion? Na2SO4
Yes
No
Omg please help me im doing so well in science i have a 100 and this if for a grade and i really need t o kkeep that 100
Answer:
b
Explanation:
This means that it takes more energy or heat to increase water's temperature than it does for most other substances. The specific heat of water is greater than that of dry soil, therefore water both absorbs and releases heat more slowly than land.
For the following elements (Group 1A), Li, Na, K, Rb), which atom is larger overall?
Answer:
The smallest atom you have listed would be lithium (Li).
Explanation:
Lithium is the third smallest atom listed on the periodic table of the elements. It has an atomic number of three, meaning it has three protons in it's nucleus.
Atom size (Atomic radius) increases from UP to DOWN in the same COLUMN(group) of the periodic table. For example, in the first group, the Atomic radius trend from smallest to greatest is: H (smallest) -- Li -- Na -- K -- Rb -- Cs -- Fr (greatest).
Reason is, the increasing energy level (increases from n=1 to n=7) causes the shielding effect increase dramatically. And since the size of atom is mostly consist of electrons, more energy level is filled, the larger the atom will be.)
However, in the same ROW from left to right, the atomic size decreases as the number increases. For example, Li #3, is larger than Flourine (F) with an atomic number 9 because they are on the same ROW.
The pressure and temperature of N² and gas drops from 303kPa at 300K to 202²kPa at -73°C. If the initial volume is 2L, find the new volume.
Answer:
Gjvb
Explanation:
Using the combined gas law equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (kPa)
P2 = final pressure (kPa)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to this question;
T1 = 300K
T2 = -73 + 273 = 200K
P1 = 303kPa
P2 = 202kPa
V1 = 2L
V2 = ?
Using the above formula:
303 × 2/300 = 202 × V2/200
606/300 = 202V2/200
Cross multiply;
606 × 200 = 300 × 202V2
121200 = 60600V2
V2 = 121200/60600
V2 = 2L
The new volume is 2L
PLEASE HELP ME RNNNN!!! A specific characteristic, such as blue eyes, is known as a *
Answer:
A trait is a specific characteristic of an organism. Traits can be determined by genes or the environment, or more commonly by interactions between them. The genetic contribution to a trait is called the genotype.
Explanation:
if not then its a feature,
You're invited to a hot tub party! Being the science geek that you are, you decide to calculate the amount of mL in the 650.0 gallon hot tub!
Answer:
cool but can we have a little bit bigger
Explanation:
Write the formula: carbon hexabromide
Answer: C2Br6
Explanation:
PLEASE HELP!!!
How many grams of water could be vaporized (boiled) with 4590 Joules of heat?
Answer:
6
Explanation:
LAB REPORT
Lab: Charles law
I don’t know how to do this someone pls help I’m so behind I’m crying
Answer:
The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius
Explanation:
pls help 6th grade science
_____ is responsible for bringing gravity into modern science.
Isaac Newton
Galileo Galilei
Albert Einstein