Answer:
173.2 C
Explanation:
have a good day
21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.
The standard enthalpy of fusion of NaCl is 0.52 kJ/g, that is, it takes 0.52 kJ of heat to melt 1 g of NaCl at its melting point. The heat required to melt 40 g of NaCl is:
[tex]40 g \times \frac{0.52kJ}{g} = 21 kJ[/tex]
21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.
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How much a material takes time to burn?
Need Variables for the Experiment
(a) Independent Variable:
(b) Dependent Variable:
(c) Constant Variable:
(a)- Time
(b)- Heat produced(i guess)
(c)- Material
this is what I think, hope it helps
HELP! PLZZ! NEED THIS DONE ASAP!
Answer:
B)
Explanation:
4. The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Whose personal story did you read (if you read several, pick your favorite)? What was the most interesting or eye-opening part of that person's story?
Explain the similarities and differences between combination, decomposition,
and replacement reactions.
HELP PLEASE POINTS++++++++++++++ IMA MAKE BRAINLIEST
A sample of iron has a volume of 12 mL. If the mass of this object is 94 g, what is the density of iron? Will it sink or float in water? *
Answer:
density = 7.83g/mL
It will sink in water.
Explanation:
D = mass/volume
94/12 = 7.83 g/mL
density of water is 1g/mL
Object is more dense than water, meaning it will sink.
I NEED HELP FAST
complex conversions between units may require using __________ conversion factor
Answer:
More than one
Explanation:
Answer:
More than one
Explanation:
Quizlet says so
The splitting of the nucleus of an atom to produce energy is called _____ ?
A. geothermal energy
B. nuclear fission
C. nuclear fusion
D. hydroelectric power
Answer:
Explanation:
B . Is the correct answer
A ____ is a region of strong magnetic activity on the photosphere the Sun.
(A) sunspot
(B) flare
(C) Coronal mass ejection
(D) Solar wind
In a system with 4 atoms and 1 lone pair, predict whether the lone pair will be in a B site or an A site? Explain.
Answer:
B
Explanation:
The compound corresponds to a molecule AX4E where A is the Central atom, X are the other atoms present and E is the lone pair of electrons.
The shape of this molecule is based on a trigonal bipyramid since the molecule contains five electron domains.
Since there are four bond pairs and one lone pair, the molecular geometry is see-saw with equatorial bond angle <120° and axial bond angle <90°.
For AX4E (five electron pairs), the lone pair should occupy an equatorial position instead of an axial position since the equatorial position has two neighboring electron pairs that are positioned at about 90° apart from each other and two other neighboring electron pairs that are positioned at 120° from each other. The axial position has 3 neighboring electron pairs positioned at 90° from each other and another neighboring electron pair positioned at 120°. Hence the equatorial position experiences lesser repulsion compared to the axial position.
Hence in the structure pictured in the question, position B is a preferred position for the lone pair instead of position A.
Which substances form a due to chemical reaction?
A.Mass
B.Products
C.Atoms
D.Reactants
Answer:
B. Products
Explanation:
trust me its right
PLEZ HELP QUICKLY!!!! ILL MARK BRAINLIEST
Option B, P and Cl
They form covalent bond
Filling up a balloon with hot air.
Physical or chemical
Answer:
Physical.
Explanation:
Nothing changes in a chemical state just adding hot air to a balloon.
I'm pretty sure this is classified as a chemical change.
What is the Albedo of Earth?
Group of answer choices
The energy that is absorbed into Earth.
The energy that is reflected back into space from Earth.
Just a cool word.
Minion talk for energy.
SCIENCE
6TH GRADE
BRAINLIEST!!
Answer: Earth's average albedo is about 0.3. In other words, about 30 percent of incoming solar radiation is reflected back into space and 70 percent is absorbed. A sensor aboard NASA's Terra satellite is now collecting detailed measurements of how much sunlight the earth's surface reflects back up into the atmosphere.
Explanation: ik im annoying thanks
pls help asap !! unsure how to do this
Find the number of moles of 49.0 grams of H3PO4
Given parameters:
Mass of H₃PO₄ = 49g
Unknown:
Number of moles = ?
Solution:
To find the number of moles of a given specie;
number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass = 3(1) + 31 + 4(16) = 98g/mol
Input the parameters and solve;
Number of moles = [tex]\frac{49}{98}[/tex] = 0.5mole
The number of moles is 0.5mole
Please help it’s due today, I will give brainliest
the two middle ones is the answer
A student wants to find the volume of a rock. the student starts with 25ml of water in their graduated cylinder that water level rises to 37ml. what is the volume of the rock?
Answer:
12 ml
Explanation:
the answer will be calculated by subtracting 37 ml from 25 ml so ,
37 - 25
= 12 ml
In the electron cloud model of the atom, what does the cloud represent?
Answer:
electrons/electron density
Explanation:
The branch of science that deals with electrons are called chemistry. An element consists of electrons, protons, and neutrons.
The correct answer to the question is electrons density.
What is an electron?The electron is a subatomic particle whose electric charge is negative one elementary charge. Electrons belong to the first generation of the lepton particle family and are generally thought to be elementary particles because they have no known components or substructure.In the cloud model, the electrons are revolving around the nucleus. In an atom when the electron's density is very high which represents a cloud.
Hence, the correct answer is electrons.
For more information about the electrons, refer to the link:-
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Identify the atom below.
The answer is He!
Hope this helps ya out
please help me im so lost!
Answer:
An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. ... The nucleus of an atom contains protons and neutrons.
Explanation:
i'm smart you are too in your own way.
This is not a multiple choice question
A bar of metal with a volume of 12.0 cm^3 has a mass of 136 g. What us the density of this metal?
Answer:
The answer is 11.33 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 136 g
volume = 12 cm³
We have
[tex]density = \frac{136}{12} = \frac{34}{3} \\ = 11.333333...[/tex]
We have the final answer as
11.33 g/cm³Hope this helps you
What type of weather is associated with a continental polar air mass?What is a front?
Answer:
I would guess that a polar air mask would be freezing, high winds type weather. I think that's right.
Answer:
Cool and dry
Explanation:
Exactly what it is on Edge
I know I am late to answer but for the points and for the people that need it
A type of matter formed by chemically joining two or more elements is known as a A compound B) solution c) colloid D suspension
Answer:
A) compund
Explanation:
Which is most likely a physical change? A. cutting a substance into four pieces or B. burning a substance into ash and smoke or C. reacting a substance chemically to form a new substance or D. combining a substance with water to make rust
Answer:
A. cutting a substance into four pieces
Explanation:
The others include burning, reacting, and rust which make up a chemical change.
Cutting a substance into four pieces indicates a physical change. The correct option is A.
What is physical change?Even before to and after a physical change, the material implicated is unique architectural the same.
Physical changes include texture, shape, heat, and the beginning of a change in the state of matter. The texture of a substance influences how it feels.
A physical change is simply a change in appearance. The situation has not changed since the change.
Physical change can be seen in the use of cutting paper, melting butter, dissolving salt in water, and breaking glass.
Chemical reaction takes place when bonds among molecules or atoms are broken or formed.
This implies that one material with a specific set of properties is transformed into another substance with a different set of properties.
Thus, the correct option is A.
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Photosynthesis occurs in
the mitochondria
chloroplast
Please help!! will give brainliest!! The temperature if the water to the nearest degree:__°C
Answer:
102 degrees, the intervals go by 2
Perform each of the following operations as indicated. Express your answers to the correct number of significant figures and unit.
1. 5 x 10–7 kg + 3 x 10–7 kg
2. 4 x 105 kg + 6 x 105 kg
3. 1.66 x 1019 kg + 2.30 x 1019 kg
4. 7.2 x 10–12 kg - 2.6 10–12 kg
5. 3.8 x 10–12 m2 - 1.90 x 10–11 m2
6. 2.26 x 10–18 m2 - 1.8 x 10–18 m2
How many centimeters are in 1 inch?
The metric system is used to measure the objects based on various parameters. A centimeter is a unit of length. One inch is equivalent to 2.54 cms.
What is the metric system?The Metric system is the system used to estimate the weight (mass), length, and capacity of the object and was first introduced in France by Gabriel Mouton, a mathematician, and an astronomer. The metric system measures length, mass, volume, time, etc.
The metric system of length use the SI unit of meter, other units used to measure the length are centimeter, kilometer, millimeter, inches, yard, mile, feet, etc.
Given,
Length = 1 inch
It is known that an inch is equivalent to 2.54 centimeters, hence, 1 cm = 2.54 cms.
Therefore, there are 2.54 centimeters in one inch of the object.
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