Answers
Related Questions
How many reflector surfaces does a radio telescope have?
Answers
Answer:
I believe 2
Explanation:
Primary parabolic reflector and the sub reflector
Calculate the density of a piece of mass of metal. The rectangular piece of solid metal has the measures of 2.0 cm 3.0 cm in 2.0 is the unidentified
metal has a mass of 40
Answers
Answer:
Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)
Explanation:
volume = length × breath × height
let's take it as,
length = 2.0cm
breath = 3.0 cm
height = 2.0 cm
mass = 40 kg or g (since you didn't state the unit of the mass)
volume = ?
volume = length × breath × height
volume = (2 × 3 × 2)cm
volume = 12 cm³
Density = mass /volume
40kg or g/12cm³
Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
Answers
7.2 / 2.4 = 3 half-lives
(1/2)3 = 0.125 (the amount remaining after 3 half-lives)
100.0 g x 0.125 = 12.5 g remaining
Which of the following is a fossil fuel?
A. oil
B. Copper
C. aluminum
D. Cattle
Answers
Answer: oil
The answer is A, oil. Oil is one of the most popular fossil fuels. You probably did not know the answer was fossil fuels. The answer is oil.
Hope this helps you!
All matter has a distinct melting and boiling point that we can use to describe it. Look at these thermometers. They show the temperatures at which each type of matter change from solid to liquid to gas. Use these thermometers to answer the questions on this worksheet.Preview the document
Answers
Answer:
Química orgánica
Explanation:
Are carbon atoms a pure substance or a mixture?
Answers
Answer:
Substance
Explanation:
Answer: Substance
Explanation:Ex: Hydrogen gas is a pure substance, as it is made up of only Hydrogen atoms or molecules. Carbon, gold, & nitrogen are other elements (pure substances).
Which element will be more reactive - Mg (magnesium) OR Se (Selenium)? *
Answers
Answer:
magnesium
Explanation:
magnesium is in Group 2, in the periodic table. this means that it has 2 valence electrons. the less valence electrons an element or atom has, the more reactive. Selenium has 6 valence electrons. as a result, Mg is more reactive
What information does a radioactive element's half-life tell you about that element?
Answers
which object would require the most amount of energy, or force, to set it to motion?
a. school bus
b. refrigerator
c. microwave
d. houseplant
Answers
Explanation: a school bus is huge and heavy there for setting it in motion would take a lot of work
One particular snake, say a rattle snake or a cobra, doesn't always look the same. Describe three different ways a rattle snake or a cobra, or another snake of your choosing might appear depending on where it is and what it's doing. What makes the appearance of the snake different in each situation? How you would know in spite of the differences that it is a snake of a particular type?
Answers
Explanation:
Both cobras and rattlesnakes are dangerous snakes. Both snakes deliver fatal bites to humans. but their venoms are of different type.
Cobras are long slender snakes, they usua grow between 4 and 6 feet, although they are other species which grow up to 18 to 24 feet. a Cobra can be identified with its most common features 1.hood behind their heads.
While a rattle snakes gives a warning sign when approaching this sound is known as rattle.
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s
Answers
Answer:
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s?1,5625J
Which pattern(s) may be observed from the arrangement of elements in the periodic table? Select all that apply.
A. increasing number of protons
B. similarity in the number of their valence electrons
C. similarity in their physical and chemical properties
D. increasing relative abundance on Earth's surface
Answers
Answer:
A, B, C.
Explanation:
The periodic table exemplifies the number of protons for each element, the number of valence electrons for each element, and depending on the specifications and the complications of the periodic table (in other words the higher quality of a periodic table) will also commend upon you physical and chemical properties of each element and each group of which they belong to. Hopefully this helps.
The pattern(s) may be observed from the arrangement of elements in the periodic table -
A. increasing number of protonsB. similarity in the number of their valence electronsC. similarity in their physical and chemical propertiesThe periodic table has various types of patterns in their arrangement of elements.
As you move to the right, the atomic number increases, meaning the number of protons increases.The number of valence electrons decreases from left to right across each period.The number of valence electrons increases from top to bottom within each groupEach element within a group has similar physical or chemical properties because of its atom's outermost electron shellThus, the correct choices are - A, B, and C.
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Which is one precaution to take when working with heat and fire?
Do not use during experiments.
Keep flammables away.
Avoid touching face and eyes.
Do not mix chemicals unless told to do so.
Answers
1. What are physical and chemical properties of metals, nonmetals, and metalloids?
Answers
Have a good day!
Describe a few abiotic factors found within the taiga that limit its biodiversity.
Answers
Answer:
Some abiotic factors of the taiga are temperature, precipitation, soil, and sunlight.
Explanation:
emperature affects the taiga because the winter temperature range is -65*F to 30*F (-54*C to -1*C), while the temperature range in the summer is 20*F to 70*F (-7*C to 21*C)
Precipitation affects the taiga because there's some precipitation that falls [30-85 cm. (12-33 in.)].
Soil affects the taiga because there's some acidic and low-in-nutrients soil, and some fertile soil.
Sunlight affects the taiga because there are small amounts of it that reach the ground.
The taiga biome's abiotic components include temperature, sunshine, soil, air, water, etc. Cold arctic air predominates in the taiga environment. The taiga receives more light in the summer, which causes the days to be hotter.
What are abiotic components ?Abiotic elements, also known as abiotic factors, are non-living chemical and physical elements of the environment that have an impact on the health of living things and the operation of ecosystems. Biology as a whole is supported by abiotic causes and the phenomena that go along with them.
Biotic and abiotic components, such as rainfall, in that order. The taiga is the biggest biome on Earth's surface and features a diversity of migratory and resident creatures. It also has long, cold, and dry winters and short, warm, and moist summers.
The Taiga biome is restricted by four primary criteria. Fire, temperature, the quantity of nutrients in the soil, and sunshine are the four limiting elements. Because certain plants, like the Jack Pine, recover after fire, it is a limiting element in the Taiga biome.
Thus, The taiga biome's abiotic components include temperature, sunshine, soil, air, water, etc.
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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?
Answers
Formula of density is : p=m divide by v
P is density , v is volume and m is mass.
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
A scientist heats a 300-g sample of iron from 30°C to 50°C. How much heat did the iron absorb.
The specific heat capacity of iron is 0.45 J/gºC.
Оа
Oь
Ос
Od
3,000)
2,700)
202,500)
2,500)
Answers
Answer:
d
Explanation:educated guess
Samples of the air we breathe that were taken from different parts of the world have all been found to contain about 78% nitrogen, 2196
oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases. Based on this analysis, which is the correct classification for air?
Answers
Answer:
homogeneous mixture
Explanation:
The correct classification for air is a homogeneous mixture.
What is a Mixture?Material is referred to as a mixture when two or more chemicals combine without undergoing a chemical reaction.
Heterogeneous and homogeneous mixtures are the two types of mixtures.
While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components.
A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.
Mixtures are composed of two or more different substances that have not been chemically mixed. The following is a list of mixture properties.
Each of the components in a mixture retains its unique features.
Component separation is simple to carry out.
The component's relative weights vary.
The classification for air is 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases.
This classification for air has the properties of a homogeneous mixture.
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What is the volume of 3.0 grams of lead?
Answers
Answer:
it should be 0.01
Explanation:
how is dissolving different from melting
Answers
Answer:
Melting: one substance is involved and the liquid and solid are the same material.
To melt something heat is essential.
Dissolving: involves two materials;the resulting solution is a mixture of two substances.
The dissolved substance is still present in the solution even though it cannot be seen.
Explanation:
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Which factors are needed for organisms to live earth
Answers
Answer: sunlight, water, air, habitat, and food.
Explanation: we are all living organisms and we all have our five basic necessities for survival; sunlight, water, air, habitat, and food.
A bond between a nonmetal and a nonmetal is called a(n)
bond.
A. hydrogen
B. metallic
C. covalent
D. ionic
Answers
Answer:
answer: B
Explanation:
becaucse it is B
A bond between a nonmetal and a nonmetal is called a covalent bond. The correct answer is option C.
Covalent bonding occurs when two nonmetal atoms share one or more pairs of electrons in order to achieve a stable electron configuration.
This type of bond is characterized by the sharing of electrons between the atoms, rather than the transfer of electrons as in ionic bonding.
An example of a covalent bond between two nonmetals: The bond between two oxygen atoms in an [tex]\rm O_2[/tex] molecule. In this molecule, the two oxygen atoms share two pairs of electrons to form a stable covalent bond.
Therefore, option C. Covalent bond is a bond between a nonmetal and a nonmetal.
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Ionic compounds can conduct electricity in
Answers
Answer:
Solution and the liquid state
Explanation:
Edge2020
will someone help me, marked as brainiest
Answers
Answer:
C
Explanation:
Answer:
c.metal
Explanation: metal is able to carry heat
Curiosity is important in the progress of science because it
A. aids in the interpretation of data.
B. encourages new experimentation.
C. ensures the inclusion of different viewpoints.
D. allows a scientist to learn from others.
Answers
Answer:
B
Explanation:
because it makes you want to know what happens in an experiment
Answer:
B. encourages new experimentation.
Explanation:
right on EDGE 2021
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Which of the following is a physical blend of two or more substances with uniform composition? Select all that apply.
A. Homogeneous mixture
B. Heterogeneous mixture
C. Solution
D. Pure substance
Answers
Answer:
homogeneous mixture
Explanation:
A homogeneous mixture and Solution are the physical blend of two or more substances with uniform composition. Thus, options A and C are true.
What do you mean by Mixture?“Mixture is an act of combining two or more chemical substances that are not chemically linked.”
Types of mixtures –
There are two main types of mixture.
Homogeneous Mixture –
A Homogeneous Mixture is a mixture in which composition is uniform throughout the mixture, and it appears like a single substance.
Example – Air is a homogeneous mixture of gas etc.
Heterogeneous mixture –
A Heterogeneous mixture is a mixture in which composition is not uniform throughout the mixture.
Example – Vegetable soup is a heterogeneous mixture etc.
Solution –
A Solution is a homogeneous mixture of two or more solutes dissolved in a solvent.
Example – Solution of sugar in water etc.
Thus, a homogeneous mixture and solution are the physical blends of two or more substances with uniform composition. Thus, options A and C are true.
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why is the heating loop in the electric kettle at the bottom of the kettle?
Answers
Answer:
The heating element is near the bottom of the kettle because of the way it heats up the water. The water is heated through the flow of electricity meeting resistance in the form of the element.
Explanation:
Which part of scientific design occurs when an experiment is conducted by more than one scientist to determine the validity of results?
A. replication
B. research
C. trials
D. variables
Answers
Answer: c
Explanation:
i think the answer is c
Who uses petroleum and for what purpose?
Answers
Answer:
today, petroleum is mostly used as a source of energy, being rich in combustible carbon in the production of electricity or running some sorts of heat engines. ... Raw petroleum (also known as crude oil) is used in three major ways: Transportation, Electricity Generation, and Material Production.
Explanation:
hope it helps!!!!!!!!!!!!!!!!!!!!!!!!!!
We use petroleum to propel vehicles and to heat buildings
A sample of 4.0 mol of neon gas at a pressure of 2.5 atm is injected into a container at
25°C. What is the volume of the container?
Answers
Answer:
The volume of container is 39.14 L.
Explanation:
Given data:
Number of moles of neon = 4.0 mol
Pressure of gas = 2.5 atm
Temperature of gas = 25°C
Volume of container = ?
Solution:
we will use general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273 = 298 K
Now we will put the values in formula.
2.5 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K × 298 K
V = 97.86 atm.L /2.5 atm
V = 39.14 L
The volume of container is 39.14 L.