Answer:
19 protons, 19 electrons, and 3 neutrons
Explanation:
the atomic number is 19 so the protons are the same, 19, and the electrons are the same as the proton, because protons are positive and electrons are negative so they have to balance out and the neutrons ➗ mass number by the atomic number.
Which definition is correct?
a physical change creates a new substance because bonds are broken or formed
a physical change can happen without changing any characteristics of the substance
a chemical change occurs when the substance remains the same but the shape, or other physical characteristics change
a chemical change produces a new substance by breaking and forming new bonds
Answer:
last one is correct
Explanation:
bcoz when a reaction takes place there is the formation of new products with the help of old one .
plzz help meee!
Noah rides his bike 16 kilometers in 2 hours. What is his average speed?
Question 9 options:
A)
8 miles per hour
B)
8 kilometers per hour
C)
32 meters per hour
FIRST TO ANSWER GETS BRAINLIEST
Please hurry this assignment has to be turned in by 11:59
1. Terms in Science are Greek or Latin words
2. Terms in Science are derived from Greek or Latin words
Why?
Answer:
Terms in science are derived from greek and latin words because precise meaning and precise use of words is crucial in all forms of scientific communication, it helps to be able to make new medical terms from Latin and Greek roots whose meanings do not alter over time
Explanation:
The photo shows an animal called a water flea. Which level of organization is it an example of?
A. Organism
B. Organ system
C. Cell
D. Tissue
Answer:
A. organism i think
Answer:
the answer it's A Organism
:
I did the test
Which scientist's atomic model is most recent?
A. Dalton's
B. Rutherford's
O c. Thomson's
D. Bohr's
Answer:
D. Bohr's
Explanation:
I just did the test, and got it right! Hope this helps.
It was Niels Bohr who discovered the modern atomic model. This model revealed the revolution of electrons and determination of energy levels and momentum of electrons. Hence, option D is correct.
What was atomic model?Various atomic models discussed about the structure and electronic properties of atom. It was Dalton who found that atom is indivisible and combination of atoms make a compound.
Later J.J . Thomson discovered electrons the subatomic particles. But this model does not found the orbitals for electrons and energy levels. Rutherford proposed then the nuclear model of atom.
Nuclear model of atom described that the nucleus contains the positively charged particles protons and the negatively charged particles electrons are revolving around the nucleus.
Later Bohr explained the revolution of electrons around the nucleus with the aid of quantum mechanics and he found that the electrons revolves through a circular paths of fixed energy. By this model momentum and energy of electrons can be calculated.
Hence, Bohr's model is most recent.
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PLEASE ANSWER THIS I AM DOING SCIENCE AND IT SUCKS
WHICH ONE IS A SCIENTIFIC PROBLEM
The fingerlings grown in 5% saline solution will grow
faster than the fingerlings grown in 10% saline solution.
What is the growth rate of the fingerlings in 5% saline
and 10% saline solutions?
Put the levels of organization in order with 1 being the largest and most complex and 7 being the smallest and most specific.
Question 3 options:
ORDER
CLASS
KINGDOM
SPECIES
PHYLUM
GENUS
FAMILY
DOMAIN
When citric acid reacts with baking soda, a salt, water and a gas are produced. What is the name of the gas?
a) carbon dioxide
b) oxygen
c) sodium citrate
d) water vapor
Answer:
The answer is A
Explanation:
Hey Guys... I need help again...
Having freckles (F) is dominant over not having freckles (f). A parent with freckles is crossed with a parent without freckles. The Punnett square shows the possible genotypes of the offspring.
What is the genotype of each square?
A: FF Ff ff
B: FF Ff ff
C: FF Ff ff
D: FF Ff ff
Answer:
A: Ff
B: ff
C: Ff
D: ff
Explanation:
You basically look at the box it's asking for, let's use A as an example. On the top where the A column is there's F, so that's one of the thingys I forgot what they're called. Next look at the row of A, and there's f. Put the 2 together and you get Ff. Reminder that any uppercase ones come first.
Explain why plants need sunlight?
A.) Plants need sunlight to create food such as sugars and starches.
B.) Sunlight is used to allow plants perform photosynthesis at night.
C.) Sunlight is used to help release waste produce such as oxygen in plants.
D.) Plants need sunlight to help capture carbon dioxide to create sugars and starches.
Answer:
D
Explanation:
They make their own food by combining a gas called carbon dioxide, which they get from the air, with water from the soil. ... To power the process, the plant uses the energy of sunlight. A green pigment in the leaves called chlorophyll traps the Sun's energy
Which elements have 8 valence electrons?
Answer:
Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon (Ne), argon (Ar), and krypton (Kr).
What do you understand by Biological nitrogen fixation? PLEASE ANSWER RN
Answer: Because it is the principal source of the nitrogen in the soil, nitrogen that plants need to grow, nitrogen fixation is one of the most important biochemical processes on Earth. Nitrogen within living organisms is eventually decomposed and converted to atmospheric nitrogen.
Answer: Nitrogen fixation is a process by which molecular nitrogen in the air is converted into ammonia or related nitrogenous compounds in soil.
Explanation:
did you know you have to answer 1000 questions to be able to message someone?
Answer: i didnt know that
Explanation:
Answer: Yes this is in fact true
Explanation:
Is a comet found between Mars and Jupiter
This is a Yes or No question
Thank you, Subject is science
Answer:
yes there is a comet
Explanation:
Please i really need help
Answer:
in my opinion the answer is A
Brainliest answer please im not wasting my points for no reason please this is the last one and then im done please thank you
What do the solid lines on the topographic map represent?
A. changes in rock types
B. lines of equal pressure
C. lines of equal elevation
D. changes in vegetation
Answer: I think it’s C
Explanation:
What do cells need to get energy from food?
A. Carbon dioxide
B. Oxygen
C. ammonia
D. Vitamin C
Answer:
I believe the answer is B oxygen
Explanation:
would be awesome if you could give me brainliest!
Nancy dumps a mixture of salt, iron filings, and wood shavings into a beaker of water and stirs for 60 seconds. Predict the appearance after she stops stirring and allows the mixture to settle.
Answer:
When the mixture settles, there will be no visible salt, but she will see the iron shavings at the bottom of the beaker and the woodchips floating.
Explanation:
The salt will dissolve, the iron shavings will sink and the wood chips will float because they're less dense.
What is a change in matter that results in a change in its identity and properties? *
Answer:
Chemical change
Explanation:
20 points and very easy-
Match the following with the letters and numbers below:
1. Energy of an objects position above the ground
2. Stored in the bonds of atoms and molecules
3. Stores in the nucleus of an atom
4. Energy of vibrating molecules
5. Movement of objects used to do work
6. Created by vibrations in electric and magnetic fields
A. Heat
B. Mechanical energy
C. Nuclear energy
D. Chemical energy
E. Light
F. Gravitational energy
Thank you in advance!! Please hurry!
(04.01 MC) 20 POINTS!!!!!!!!!!!!!!
Greg wrote the following steps in the formation of sedimentary rocks.
Step 1: Weathering of rocks forms sediments
Step 2: Sediments are heated
Step 3: Sediments are deposited
Step 4: Compaction and cementation forms rocks
Which step contains an error?
Select one:
a. Step 1
b. Step 2
c. Step 3
d. Step 4
Helium is a "special" element in Group 18 because it does not have 8 valence electrons. Why doesn't helium have 8 valence electrons like all the other elements in group 18?
C IS THE ANSWER BECAUSE HELIUM HAS JUST 2 ATOMS
Helium is an element which belongs to a family called noble gas.
Among the noble gas element, helium is the only member with two (2) electrons.
Helium is a s-block element. S-block can only accommodate a maximum of 2 electrons. The two (2) electrons that helium has complete its outermost shell as seen from its electronic configuration below:
He (2) => 1s²Since the outermost shell of helium is completely filled, it is thus included in the noble gas family (i.e group 18).
Other members of the this group include: Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn)
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Is a comet between Mars and Jupiter?
What is a comet?
What is a asteroid? Not an asteroid belt
:D...........
.............
Answer:
Yes, there are comets between Mars and Jupiter.
Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun.
Asteroids are small, rocky objects that orbit the Sun.
NASCAR fans love race day when they get a chance to cheer their favorite team! If a driver was able to travel 600 miles in 3 hours, what is her average speed? Be sure to use the correct formula (s=d/t)
Question 8 options:
A)
1800 mph
B)
200 mph
C)
300 mph
200 mi/hr
Step-by-step explanation:
s= d/t 600 miles/3 hrs = 200 miles/hr
BTW I Love NASCAR
This photo shows a kind of reproduction. Which of the following describes this type of reproduction?
A. Two parents are required to produce this offspring.
B. Each offspring has a different combination of genes.
C. The offspring have identical genes.
D. Parents make reproductive cells with only half of their genes.
A. Two parents are required to produce this offspring.
Which best protects animal species that are endangered due to overhunting?
laws
increased biodiversity
poaching
captive breeding
Answer:
i believe the correct answer is d.) the correct answer is captive breeding but if its not im sorry
Answer:
captive breeding
Explanation:
The imagine below shows an atom arrangement.
Why is it considered a mixture?
a) it’s composed of 1 kind of atom
b) it’s a physical combination of two or more different substances
c) it’s composed of 2 or more types of elements that are chemically combined.
Rocks around mid-ocean ridges teach scientists about
A. how wide abyssal plains are
B. how earthquakes happen
C. changes in the earth's crust
Will give brainlest
Answer:
I think is C
Explanation:
PLEASE MARK ME AS BRAINLIEST
Thermal energy “flows” from warmer areas to colder areas. Heat is a measure of this flow.
True or False
Answer:
True
Explanation:
Throughout the universe, it's natural for energy to flow from one place to another. And unless people interfere, thermal energy — or heat — naturally flows in one direction only: from hot toward cold. Heat moves naturally by any of three means. The processes are known as conduction, convection and radiation.
The statement, "Thermal energy “flows” from warmer areas to colder areas. Heat is a measure of this flow" is true.
What is thermal energy?The energy created by heat is referred to as thermal energy. It is created when a body's temperature rises. As a result, the molecules, and atoms start to sprint, move quickly, or crash into one another.
When a substance's temperature rises, heat, a type of energy, is created. Temperature, thermal energy, and heat all relate to one another. Heat always moves from a hot body to a cold body.
The heat or thermal energy in the body increases as the temperature rises, causing the movement of the atoms to accelerate and the atoms to collide. Heat is a variable of thermal energy.
Thus, the statement is true.
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300 g of requires 30000 J of thermal energy to raise the temperature from 25 °C to 85 °C, what is the heat capacity of water? ANSWER ASAP PLEASE
According to the concept of specific heat capacity, the heat capacity of water is 1666.67 J/Kg°C.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
Substitution of values in the above equation, c=30000/0.3×(85-25)
c=1666.67 J/kg°C
Thus, the heat capacity of water is 1666.67 J/Kg°C.
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