Answer:
Loses
Explanation:
liquid changes into solid, heat is released. The energy released upon freezing, known as the enthalpy of fusion, is a latent heat, and is exactly the same as the energy required to melt the same amount of the solid.
Answer:
Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. For a solid to change to a liquid, matter must absorb energy from its surroundings.
Explanation:
Political considerations played a great role in the decision for the United States to enter the Space
Race.
True
False
True
The Cold War & tensions with Russia led to the great Space Race. Getting into space was a goal of the US as well as Russia and whomever got into space would be considered superior in the world's perspective
How much force is required to accelerate a 12 kg mass at 5 m/s2?
Answer:
The answer is 60 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 12 × 5
We have the final answer as
60 NHope this helps you
Use the information given to calculate the average atomic mass of element Z. Z- 56 is 70% abundant and Z-59 is 30% abundant.
Answer:
56.9 amu
Explanation:
Depending on the number of isotopes an element has, the Average atomic mass of isotopes of an element can be calculated using:
(atomic mass of isotope1 × decimal abundance of isotope1) + (atomic mass of isotope2 × decimal abundance of isotope2)
According to this question, two isotopes of element Z were given
- Isotope Z- 56 with atomic mass 56 is 70% abundance. This means that its decimal abundance is 0.70
- Isotope Z- 59 with atomic mass 59 is 30% abundance. This means that its decimal abundance is 0.30
Therefore, average atomic mass of element Z is:
= (56 × 0.70) + (59 × 0.30)
= (39.2) + (17.7)
= 56.9
How to do ionic equations
Answer:
Write the ionic equation by breaking all the soluble ionic compounds into their respective ions. Each ion should be shown with its charge and an to show that it is present in solution. Use coefficients to show the number of each ion present.
Explanation:
Hope this helps and I hope you have a wonderful day! Spread the love!
What would be the pH after mixing!!
When you mix copper and tin, you make bronze. No chemical reaction occurs.
What is bronze?
O A. An element
B. A compound
O C. An alloy
O D. A molecule
SUBMIT
Answer:
C. Alloy
Explanation:
Bronze is an alloy because the creations of alloys are not chemical reactions. An alloy is made when a metal is combined with another metal or a nonmetal.
Define Each Piece of the Microscope
Describe What Each Microscope Lens Does
Describe How The Microscope Magnification Lens Works
1) Body tube (Head): The body tube connects the eyepiece to the objective lenses. Arm: The arm connects the body tube to the base of the microscope. Coarse adjustment: Brings the specimen into general focus. Fine adjustment: Fine tunes the focus and increases the detail of the specimen.
2)Microscopes are made up of lenses for magnification, each with their own magnification powers. Depending on the type of lens, it will magnify the specimen according to its focal strength.
3)In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. ... The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x. (Microscopes usually come with a set of objective lenses that can be interchanged to vary the magnification.)
does anyone know how to do this??????
Answer:
you have to answer about what Emmy Noether was known for and how she accomplished her goal! For example Dr. Martin Luther King was known for his peaceful protests and his famous "I Have a Dream". He accomplished this goal by never giving up and sticking to his morals! I hope this helped!! ♡♡ (BTW love your profile picture)
How can charged objects interact without touching
What is the volume of a box that has a length of 5 cm a width of 7 cm and a height of 9 cm
Answer:
V = L × w × h
V = 5 × 7 × 9
V = 315 cm³
what is the basis of modern periodic table?
Explanation:
The periodic table is an arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations and recurring chemical properties.
The electronic structure of the atom X is : 2, 8, 1
A. In which group atom x is found:—————-
B. In which period atom x is found:—————
C. What is the name of atom x:———————-
Answer:
A. grou(I)
B. 3rd period
C. Sodium (Na)
Explanation:
it belongs to group (I) since it has one valence electron
it belongs to 3rd period since it has three energy levels
.What threatens the newly hatched chicks?
Answer:
rats. that's all i know of Just about everything except the mother hen if they are natural hatch. Even when you incubate them there are threats. The healthy chicks will mob the weak ones, the older chicks (even by a day) will pick on the younger ones. Temperature extremes will threaten them as they need warm, humid conditions with gradual drops in surrounding temps in the brooder box. Early disease is sometimes a problem and all chicks should be started on medicated chick feed for the first few weeks to prevent several digestive diseases. Even the water dispenser can be a threat as newly hatched chicks will immerse themselves in an open water container so care should be taken to supply water in a self feeding covered dish.
Explanation:
Answer:
im pretty sure its just rats and the mother hen if the chick isn't healthy
Explanation:
determine the density of a liquid if 75 mL of the liquid have a mass of 63 g
Answer:
The answer is 0.84 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 63 g
volume = 75 mL
We have
[tex]density = \frac{63}{75} = \frac{21}{25} \\ [/tex]
We have the final answer as
0.84 g/mLHope this helps you
(PLS HELP will mark brainliest!) Compare and contrast the alkali metals and the alkaline earth metals. Discuss their physical and chemical properties, their magnetic properties, and their electron configurations.
Answer:
I have a picture from my excerpt that basically answers all of that!
Hope it helps!
Explanation:
The attachment
The alkali metals and alkaline earth metals has different physical and chemical properties due to difference in their valence electrons.
Comparison of physical and chemical properties of alkali metals and the alkaline earth metals. Alkali Metals Alkaline earth metals·Electronic [Noble gas]ns1 [Noble gas]ns2
configuration
·Reactivity Comparatively more reactive Comparatively less
reactive
·Hardness Soft and can be cut by sharp Comparatively harder
knife
·Valency One valence electron Two valence electron
·Ionic charge +1 +2
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1. In part 1, you collected data about how the amount of sugar affects the amount of gas produced. Analyze those data and draw a conclusion. (16 points) a. What gas inflated the balloons? (2 points)
Answer:
carbohydrate is an essential biomolecule so the affect of suger fluctuates when enzyme consumes the substrates of glucose molecules
the human eye has three types of cones cells. damage to any one of the types of cone cells doesn't cause total blindness because of the
A. presence of rod cells
B. other two functional Cone cells
C. presence of optic nerves
they have rod cells - this helps them be able to see colors through a spectrrum located in the retina
Explain how your answer to CTQ 6 is consistent with your answer to CTQ 5.
Answer:
up 1
Explanation:
How many moles (of molecules or formula units) are in each sample?
A) 32.66 g CF2Cl2
B) 24.2 kg Fe (NO3) 2
C) 0.5912 g C8H18
D) 104 kg CaO
Express all answers to 4 sig figs
Answer:
A = 1.627 ×10²³ molecules of CF₂Cl₂.
B = 809.4 ×10²³ molecules of Fe(NO₃)₂.
C = 0.03117 ×10²³ molecules of C₈H₁₈.
D= 1116 ×10²³ molecules of CaO.
Explanation:
A)
Given data:
Mass of CF₂Cl₂ = 32.66 g
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 32.66 g/ 120.9 g/mol
Number of moles = 0.2701 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
0.2701 mol×6.022×10²³ molecules / 1mol = 1.627 ×10²³ molecules of CF₂Cl₂.
B) Given data:
Mass of Fe(NO₃)₂ = 24.2 Kg (24.2×1000 = 24200 g)
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 24200 g/ 180 g/mol
Number of moles = 134.4 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
134.4 mol×6.022×10²³ molecules / 1mol =809.4 ×10²³ molecules of Fe(NO₃)₂.
C) Given data:
Mass of C₈H₁₈= 0.5912 g
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 0.5912 g/ 114.22 g/mol
Number of moles = 0.005176 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
0.005176 mol×6.022×10²³ molecules / 1mol =0.03117 ×10²³ molecules of C₈H₁₈.
D) Given data:
Mass of CaO = 104 Kg (104×1000 = 104,000 g)
Number of moles = ?
Number of molecules = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 104,000 g/ 56.1 g/mol
Number of moles = 1854 mol
Number of molecules:
1 mole = 6.022×10²³ molecules
1854 mol×6.022×10²³ molecules / 1mol = 1116 ×10²³ molecules of CaO.
1. Which family of elements is most likely to lose electrons?
2. Which family of elements is most likely to gain electrons?
Answer:
Elements that are metals tend to lose electrons and become positively charged ions called cations.
Elements that are nonmetals tend to gain electrons and become negatively charged ions called anions.
Hope it helps:)
Metal are the family of elements which is most likely to lose electrons. Non metals are the family of elements which is most likely to gain electrons.
What is element?The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.
118 known elements are present. A study is being done to create element 120.1. The periodic table will have to be modified to include element 120 after it has been created and validated. Metal are the family of elements which is most likely to lose electrons.
Therefore, metal are the family of elements which is most likely to lose electrons.
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Explain the law of conservation of mass.
Answer:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.
Explanation:
Your answer should be- that in a chemical reaction mass is neither created nor destroyed.
Explanation:
Is that good?
A hypothesis is ______ to explain a set of observations.
1 one possible way
2 the correct method
3 a factual statement
4 a set of data
Answer:
1
Explanation:
one possible way its just a theory of what the answer could be
Answer:
3-a factual statement
Explanation:
A hypothesis is a factual statement to explain a set of observations.
i need help ' please
Answer:
s orbitals - spherical shape
p orbitals - dumbbell shape
d orbitals- dxy, dyz , dzx -double dumbbell
- dx²-y²- double dumbbell (along axis)
-dz² -dumbbell with electron cloud
( along the axis)
therefore here the answer is 2s and 3s
What does a subscript indicate in a chemical formula?
A. The number of atoms of that element in the molecule
B. The number of bonds that element forms in the molecule
C. The position in the molecule that element occupies
D. The atomic number of the element in the molecule
Answer:
The number of atoms of that element in the molecule
Explanation:
You're welcome
The density of a material is a/an
I WILL GIVE YOU BRAINLIEST!!!
which sentence uses emitting correctly
A after emitting his mistake, Charlie vowed to make things better.
B Charlie should be emitting an apology.
C Charlie heard birds emitting a very strange sound.
D the emitting sound of an early moring birds woke charlie.
Answer:
its either A or C
Explanation:
Q) which sentence uses emitting correctly ?
Answer :(c) Charlie heard birds emitting a very strange sound .Explanation :
Emitting means ' to give off ' , since birds are giving off a strange sound , we say " Charlie heard birds emitting a very strange sound " .
One of the pieces of evidence supporting energy quantization was the line spectra of elements. Why does this demonstrate energy quantization?
a) Photons are packets of energy that act both as a particle and a wave.
b) The spectra is continuous and shows emission at all wavelengths.
c) There are sharp emission lines demonstrating discrete energy levels.
d) All compounds emit light in the ultraviolet and visible regions specifically.
Answer:
c) There are sharp emission lines demonstrating discrete energy levels.
Explanation:
When an element emits energy in the form of radiation, it produces a spectrum of colors on a photographic plate. This spectrum can either be continuous or discrete. In continuous spectrum the spectrum continues without any discrimination between two regions. This represents the continuous emission of radiation, and thus the continuous emission of energy without any break.
On the other hand, the line spectrum consists of discrete and sharp lines, which shows the emission of radiation in a certain amount in a certain time, with a break between emission. Hence, the line spectra supports the quantization of energy.
The correct option is:
c) There are sharp emission lines demonstrating discrete energy levels.
i'll mark brainliest if you can answer this quick and correctly only correct cause i don't accept bad answers or i'll report you if i get a bad grade
'
What is the charge of protons?
Answer:
protons naturally have the charge of +1
Answer:Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms
Explanation:
A sample has a PH of 4, and another sample has a PH of 9. Which sub is the base? How many times basic is it??
Answer:
the first one
Explanation:
the first one is the base because it has a lower PH