Answer:
A
Explanation:
Apex
Would you feel like a superhero if you could melt metal just by holding it? The element gallium is a solid at room temperature, but it will reach
its melting point and melt if you hold it in your hand. If you pour the liquid gallium into a container at room temperature, it will become solid
again. How do the melting point and the freezing point of gallium compare to each other?
O A The freezing point of gallium is higher than its melting point
O
B. The freezing point of gallium is lower than its melting point.
O
C. The freezing point of gallium equals its melting point.
OD
Both the freezing point and the melting point of gallium vary.
Answer:
C is your correct answer i blieve
The element gallium has equal freezing point and melting point owing to which on pouring liquid gallium in container it becomes a solid.
What is an element?An element 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.
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Alveolar air (a mixture of nitrogen, oxygen, and carbon dioxide) has a total pressure of 0.998 atm. If the partial pressure of oxygen gas is 0.198 atm and the partial pressure of nitrogen gas is 0.770 atm, what is the partial pressure of carbon dioxide in millimeters of mercury?
Answer:
22.8 mmHg
Explanation:
According to Dalton's law of partial pressures, the total pressure of a mixture of gases is obtained as the sum of the partial pressures if all the individual gases present in the mixture.
Since the total pressure of gases in the mixture is 0.998 atm, the partial pressure of carbon dioxide is;
PCO2 = [Ptotal - (PO2+ PN2)]
Hence;
PCO2 = [0.998 - (0.198 + 0.770)]
PCO2 = 0.03
Since
1 atm = 760 mmHg
0.03 atm = 0.03 × 760 /1
=22.8 mmHg
which feature is created on the exterior of a volcano when it errupts
Answer: Crater and lava flow
Explanation:
23. A 54-gram sample of an unknown material has a volume equal to 20 cm'. Based on its density,
could the sample be aluminum? Explain.
Answer:
The density of aluminum is 2.7 g/cm³. Thus given sample is aluminum.
Explanation:
Given data:
Mass of sample = 54 g
Volume of sample = 20 cm³
Density of sample = ?
Is the sample is aluminum = ?
Solution:
We will calculate the density from given mass and volume.
d = m/v
d = density
m = mass
v = volume
d = 54 g/ 20cm³
d = 2.7 g/cm³
From literature it is known that the density of aluminum is 2.7 g/cm³. Thus given sample is aluminum.
which of the following pairs would have
a the
larger size
K or k+ ?
Explain your
ur answer.
Answer: Here u go!
Explanation:
In other words, "K"^(+) has bigger effective nuclear charge than "Cl"^(-), which translates to a bigger net positive charge felt by the outermost electrons. This will compress the energy levels a bit and make the ionic radius smaller for the potassium cation. Therefore, the chloride anion will have the larger atomic radius.
Hope this helps ma dude!
What must be true if an atom is ionized?
Select one:
a. It must be radioactive
O b. It must have different numbers of protons and neutrons
O c. It must have an electron that has jumped to a higher energy
level
O d. It must have different numbers of protons and electrons
Answer:
I think it’s D.
Explanation:
An atom does not have a different amount of protons and electrons if there is no change... During ionisation you either lose or gain electrons, so when that happens (a change) it will have a different number.
The density of pure solid copper is
2.54 g/mL. What is the mass of 250 milliliters of the substance
Answer:
The answer is 508 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 2.54 × 200
We have the final answer as
508 gHope this helps you
Assume that an object has been placed in the pan of a triple beam balance. The
scales of the balance are shown below. What is the mass of the object?
Answer:
190.4 g
Explanation:
To obtain the mass of the object, we must be able to obtain the reading of the triple beam balance.
Thus, the reading of the balance can be obtained by simply adding the various values as indicated by the pointer in each scale.
This can be obtained as follow:
Scale 1 = 90 g
Scale 2 = 100 g
Scale 3 = 0.4 g
Reading of the balance = Scale 1 + Scale 2 + Scale 3
Reading of the balance = 90 + 100 + 0.4
Reading of the balance = 190.4 g
Thus, the mass of the object as indicated by the triple beam balance is 190.4 g.
how many carbon atoms are in C6H14N4O2
a.4
b.2
c.6
d.14
Answer:
6
Explanation:
Answer:
6
Explanation:
C6
Carbon 6
Ammonium nitrate (NH4NO3) is a common component of fertilizer because it is a great source of two nitrogen-containing ions that easily dissolve into water. A large batch of this liquid fertilizer is made by adding 2.13 pounds of ammonium nitrate to 26.00 gallons of water. What is the molarity of this solution? (Hint: 1 lb. = 454 g and 1 gal. = 3.79 L.)
Answer:
0.123 M
Explanation:
Molarity, which is molar concentration can be calculated by using the formula;
Molarity = number of moles (n) / Volume (V)
Number of moles of NH4NO3 can be calculated by using;
Mole = mass (M) / Molar mass (MM)
Since atomic mass of N= 14, H=1, O=16
Molar mass of NH4NO3 = 14 + 1(4) + 14 + 16(3)
= 14 + 4 + 14 + 48
= 80g/mol
1 pounds = 454g
2.13 pounds= 2.13 × 454 g
= 967.02g
Hence; mole of NH4NO3 = 967.02/80
= 12.09moles
Molarity of NH4NO3 in water (solution) = number of moles of NH4NO3 ÷ volume of water
1 gallon = 3.79Litres
26gallons = 26 × 3.79 litres
= 98.54 Litres
Therefore, Molarity = 12.09/98.54
Molarity of NH4NO3 solution = 0.1226
= 0.123M or mol/L
How are u supposed to tell how many neutrons and electrons an element has?? Pls help if u know the answer.
Answer:
Explanation:
The atomic number (number at the top) is the amount of protons and the amount of electrons. So if an element has an atomic number of 5, you know that it has 5 protons and 5 electrons. The atomic mass (number at the bottom) is the amount of protons and neutrons added together.
Make a suggestion on how you will deal with each problem.
Typically, water runs through the baseboard copper tubing and, therefore, fresh hot water is constantly running through the piping. However, consider a pipe where water was allowed to sit in the pipe. The hot water cools as it sits in the pipe. What is the temprature change, (ΔT), of the water if 210.0 g of water sat in the copper pipe from part A, releasing 3178 J of energy to the pipe? The specific heat of water is 4.184 (J/g)⋅∘C.
Answer:
-3.617 °C
Explanation:
Step 1: Given data
Mass of water (m): 210.0 g
Energy released in the form of heat (Q): -3178 J (the minus sign corresponds to energy being released)
Specific heat of water (c): 4.184 J/g.°C
Temperature change (ΔT): ?
Step 2: Calculate the temperature change
We will use the following expression.
Q = c × m × ΔT
-3178 J = 4.184 J/g.°C × 210.0 g × ΔT
ΔT = -3.617 °C
Earth is approximately 149,600,000 kilometers away from the sun. How would this distance be expressed in scientific notation?
Answer:
bo
Explanation:
I dont know nothing cuz am that smart and yes am cool wait I have to wait 67 seconds am not done answering you questions I will be back in a few....
23. A 54-gram sample of an unknown material has a volume equal to 20 cm'. Based on its density,
could the sample be aluminum? Explain.
Answer:
The given sample is aluminum.
Explanation:
Given data:
Mass of unknown sample = 54 g
Volume of given sample = 20cm³
Is sample is Al = ?
Solution:
In order to solve this problem we must know the density of Al from literature.
density of Al = 2.7 g/cm³
Now we will calculate the density of given unknown sample.
d = m/v
d = 54 g/ 20cm³
d = 2.7 g/cm³
Thus given sample is aluminum.
PLEZ HELP ANSWER. IM STUCK!
d. 3
Explanation:
because the valence electrons on O is 3
An engineer has created a new design for the pipe systems in homes. In this design, pipes are joined together with flexible connectors that will protect against movement of the pipes. This new pipe system can be used for water, gas, and sewer lines. The engineer's design is most likely intended to lessen the impacts of which of the
Answer:
earthquakes
Explanation:
What is the mass of an object if it produces a 20 N force with a 4m/s/s
acceleration?
Answer:
The answer is 5 kgExplanation:
To find the mass given the force and acceleration we use the formula
[tex]mass = \frac{force}{acceleration} \\ [/tex]
From the question
force = 20 N
acceleration = 4 m/s²
We have
[tex]mass = \frac{20}{4} \\ [/tex]
We have the final answer as
5 kgHope this helps you
1. What are physical and chemical properties of metals, nonmetals, and metalloids?
What filters out liquid waste?
stomach
esophagus
kidneys
Answer:
kidneys
Explanation:
Lithium (Li) and oxygen (O) are both in period 2. They both have _____.
the same number of protons
two electron shells
the same number of electrons
similar properties
Answer:
So Lithium (Li) and Oxygen (O) are both have two electron shells
Explanation:
Answer:
Lithium (Li) and oxygen (O) both have two electron shells.
Explanation:
Answered correct on my test.
Also I'm aware you asked this around 4 months ago although I still wanted to answer so those who may need an answer in the future can reflect on this response and get the correct answer they deserve. Thanks! Happy New Year everyone. <3
Put the substance in a 25 mL beaker.
Click the beaker to get a closer look.
Now, observe and record the following:
- state of matter:
- appearance and texture:
- crystalline structure:
Answer:
1.) Liquid
2.) Powder
3.) No ( Not A Solid)
Explanation:
When substance put in a 25 mL beaker. than state of matter will be solid , appearance and texture will be powdered and crystalline structure will be powdered.
What is state of matter?A state of matter was one of many different shapes that matter can take. In daily life, four states of matter were visible: solid, liquid, gas, but also plasma.
What is crystalline structure?
The organized configuration of atoms, ions, and even molecules in such a crystalline material is usually referred to as crystalline structure.
Therefore,
state of matter = solidappearance and texture = powderedcrystalline structure = not solidTo know more about state of matter.
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A positively charged object is placed a short distance from a negatively charged object.
What would happen to the objects if the distance between them doubled?
The objects would -
A)attract each other and the force would decrease
B)repel each other and the force would decrease
C)attract each other and the force would increase
D)repel each other and the force would increase
Answer: attract eachother and the force would decrease
Explanation:
Which person has the most potential energy
Answer:
b
Explanation:
What are the fundamental units of mass, length, and temperature in the
metric system? *
Answer:
Kg, meters or centimeters, Celcius
fog forms when a water vapor changes to the___ state of matter?
Answer:
Gas
Explanation:
Li, Rb, F, and I
Which one would have the highest Electronegativity? Why?
Answer:
F
Explanation:
has 7 valence electrons , it really want to hog another electron to reach an octet.
therefore it has a highest electronegativity
Which characteristics of Earth’s surface can be determined by using a topographic map?
Explanation:
Contours allow the elevation and form of the cliffs, the thickness of the floor of the sea and the thickness of the slopes to be illustrated. Topographic maps of the USGS also display several other types of geographical characteristics, including highways , railroads, rivers , streams, lakes, borders, names of places or features, hills, and much more.
all matter has ____. A.mass B.weight C.color D.volume btw it is multiple choice. please help
Answer: mass
Explanation:
Please help this is due tomorrow, I will give brainliest
Answer:
both are chemical changes
Answer: both are chemical changes
Explanation:
