Answer:
A compound can not be physically separated
Explanation:
A compound is a chemical substance that comprises of atoms of more than one element i.e. two or more elements are chemically combined to form a compound. However, as stated in this question, compounds are referred to as pure substances.
This reason is attributed to the fact that a compound cannot be physically separated i.e. the constituents of a compound cannot be separated using physical changes or methods. This is because the atoms of the constituent elements are combined or joined together by chemical bonds.
Answer:
Even though a compound can be made of two or more types of atoms, it is still a pure substance because the compound can be isolated, like salt or water.
Explanation:
The size of the gray circle represents atomic radius, or
the size of an atom. Which area of the periodic table
has elements with the largest atomic radius?
Answer: Here u go
Explanation:
Atomic radii varies in a predictable way across the periodic table. The atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
A 15 % salt (NaCl)solution is made with 750.0 grams of solution. What is the mass of sodium chloride used to make the solution?
Does changing the number of neutrons change the identity of the element you have built?
Answer:if u change the number of neutrons u will .get an isotope of the same element.
Explanation: neutron can make an atom radioactive
What is the relationship between ionization energy and
electronegativity based on these cards?
Answer: here u go
Explanation:
The ionization energy can be thought of as a kind of counter property to electronegativity in the sense that a low ionization energy implies that an element readily gives electrons to a reaction, while a high electronegativity implies that an element strongly seeks to take electrons in a reaction.
Answer: Ionization energy is the energy required to remove an electron from a neutral atom in its gaseous phase.
Explanation: Conceptually, ionization energy is the opposite of electronegativity. The lower this energy is, the more readily the atom becomes a cation.
Selena breaks a piece off the end of a stick she found and notes that’s a physical change has occurred which of the following properties of the remaining piece of the stick has changed
In Ionic compounds the charges of the cation and anion should cancel out.
True
False
Choose ALL the answers that apply.
The stomach____
receives food from the esophagus
absorbs extra water
breaks down food
mixes, mashes, and churns food
absorbs digested nutrients
Answer: absorbs food, breaks down food
Answer:
Breaks down food, mixes mashes, and churns food.
Explanation:
These are the correct answers because the stomach does those functions. The small intestine is responsible for absorbing digested nutrients. The pharynx food from the esophogus.
why does a liquid take the shape but not the volume of its container
Answer:
The attraction between the particles in a liquid keeps the volume of the liquid constant. The movement of the particles causes the liquid to be variable in shape. Liquids will flow and fill the lowest portion of a container, taking on the shape of the container but not changing in volume.
The Mass of the mineral is 9.6 grams . The mineral is placed in a graduated cylinder containing 8.0 ml of water . The water rises to 16.0 ml of water. What is the Density of the mineral ?
Answer:
1.2 g/ ml
Explanation:
The volume of the mineral = increase in volume of the water whuich is 16 - 8 = 8mls.
Therefore the mineral's density = 9.6 / 8
= 1.2 g/ ml answer
Which of the following contains the GREATEST number of atoms of argon gas?
20.0 g of Ar
5.0 L of Ar at STP
6.02 x 10^23 atoms of Ar
0.75 moles of Ar
What causes the change within every twenty four hours from day to night on Earth?
A)
Earth's rotation on its axis
the tilt of Earth on its axis
Tarth's revolution around the sun
the distance from Larth to the Sun
Tamashenomena on the top of the sun that appear as dark spots compar
Please answer
Answer:
Earth's rotation.
Explanation:
Most of the options are obviously incorrect, with the exception of tilt. However, tilt is the cause of seasons, not days.
Answer: Earth's rotation on its axis
Explanation:
name two metals which are malleable or ductile
Answer:
Copper and Silver are both malleable and ductile
A hypothetical element has two main isotopes with mass numbers of 59 and 62. If 73.00% of the isotopes have a mass number of 59 amu, what atomic weight should be listed on the periodic table for this element? Answer in units of amu.
since 73% of the isotope is given, take 100%-73% to get the remaining % of the isotopes which is going to be 27%.
hence,
atomic weight= (73×59) + (27×62)
=4307+1302
=5609 amu
what types of cells did Matthias Schleiden study?... HELP PLZ!!!
Answer:
plants or The Cell Theory
Explanation:
FAST I NEED THIS TO STUDY MY QUIZ IS TOMORROW!!!!
How is an atom’s atomic number related to its number of protons? To its number of electrons?
Answer:
The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number has the symbol Z.
Explanation:
make me as brain liest
Answer:Here u go!
Explanation:
The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.
Hope this helps
which of these elements is most likely to be magnesium the most metallic of all samples?
Answer:
B
Explanation:
Just did it on usa test prep
The element which is most likely to be magnesium is the element with the electronic configuration same as magnesium.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
Learn more about element,here:
https://brainly.com/question/14347616
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At the top of a hlgh mountaln, the welght of an object Is:
O the same as that at sea level
O less than at sea level
Ogreater than at sea level
Which of the following configurations would form a bent molecule?
A. A molecule with three bound atoms and no lone electron pairs
B. A molecule with two bound atoms and no lone electron pairs
C. A molecule with one bound atom and two lone electron pairs
D. A molecule with two bound atoms and one lone electron pair
Answer:
D
Explanation:
Apex
Answer: D
Explanation:
A P E X ( I just clicked it and it’s right)
The ___ has many functions; one is to regulate growth.
Growth hormon somatotropin
1. An atom has 57 neutrons and 42 protons. How many electrons will this atom have if it
neutral?
57
44
42
40
Answer:
42
Explanation:
Because the proton number or atomic number is equal to electron number.
Answer:
42
In order for it to be neutral there must be the same amount of protons and neutrons
Have a nice day! :)
PLZ HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Reactivity
Explanation:
Luster. Ductile, and Malleabillity are all physical.
A roller skater has a mass of 75 kg and accelerates at 1.5 m/s 2 squared. What is the net force acting on her?
Answer:
The answer is 112.5 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 75 kg
acceleration = 1.5 m/s²
We have
mass = 75 × 1.5
We have the final answer as
112.5 NHope this helps you
HELP!!!!PLEASE which to terms describe how waves the them blue light are different from waves of bright red light? A. Higher amplitude B. Lower amplitude C. Longer wavelength D. Shorter wavelength choose two answers
Answer:
shorter wavelength and lower ampiltude
Explanation:
i just did this question
Answer:
B and D
Explanation:
I just took the test and got it correct ;)
Which of the following is measured in Newtons?
Mass
Acceleration
Weight
Momentum
Answer:
Mass is measured in kg
Acceleration is measured in m/s^2
Weight is measured in Newtons
Momentum is measured in kg/m^2
Which statements describe functions of the backbone? Check all that apply.
o It supports the body's weight.
O It helps to break down food.
It surrounds and protects the brain.
It replaces the spinal cord in vertebrates.
O It allows for flexibility and movement.
It helps regulates water balance.
The answer is it supports body weight and it allows flexibility and movement
Answer:
A and E
Explanation:
Backbone is the part of skeletal system and is made of 26 vertebrae in total. The backbone and bones of lower limbs together serve to support the body's weight. Backbone surrounds and protects the spinal cord. Since the vertebrae of backbone are joints together by synovial joints, it allows the flexibility and movement of organisms.
Answer:
flexibility and movement
Burning is a type of_________reaction.
O replacement
O decomposition
O synthesis
O combustion
Answer:
Combustion
Explanation:
Happy Halloween!
HELP ME ASAP PLEASE IDK THIS
Answer:
cExplanation:
Which statement describes an unanticipated impact of a technological
advance?
O A. Birds known as starlings were introduced to North America from
Europe and have since competed with native species for
resources.
O B. A laser system developed by NASA to help spaceships dock with
space stations was later adapted to help doctors perform eye
surgery.
O C. Used glass can be recycled as an additive to concrete, which gives
structures made of concrete more strength and better thermal
insulating properties.
O D. A network of undersea cables was constructed to provide Internet
connections between continents that are faster and more reliable
than other transmission methods.
Answer: D A laser system............
Explanation:
Answer:
O B. A laser system developed by NASA to help spaceships dock with
space stations was later adapted to help doctors perform eye
surgery.
Explanation:
How many moles of NH3 can be produced from 3.76 moles of nitrogen
in the following reaction:
N2 (g) + 3 H2 (g) → 2 NH; (g)
The number of moles of NH₃ obtained from the reaction is 7.52 moles
The balanced equation is given below:
N₂ + 3H₂ —> 2NH₃From the balanced equation above,
1 mole of N₂ reacted to produce 2 moles of NH₃.
Finally, we shall the number of mole of NH₃ produced by the reaction of 3.76 moles of N₂. This can be obtained as follow:
From the balanced equation above,
1 mole of N₂ reacted to produce 2 moles of NH₃.
Therefore,
3.76 moles of N₂ will react to produce = 3.76 × 2 = 7.52 moles of NH₃.
Thus, 7.52 moles of NH₃ were obtained from the reaction.
Learn more: https://brainly.com/question/9945440
When does the placenta begin to form?
Answer:
By week 12, the placenta is formed and ready to take over nourishment for the baby. However, it continues to grow throughout your pregnancy. It's considered mature by 34 weeks.
Explanation:
