Answer:
They are helpers of the world who find out about the natural world and try to explain what they have observed.
Explanation:
In mid-summer, a family assembled a patio set for their deck. Most of the assembling
was done by placing metal screws into plastic holes. The furniture was stable
throughout the summer. However, when the weather turned cold in the late fall, the
family noticed that the chairs and table became wobbly. Which statement best
explains what happened?
1. Plastic has greater thermal expansion than metal does.
2. Both plastic and metal contract when warm and expand when cold.
3. The metal screws contracted more than the plastic did when they became cold.
4. The metal screws contracted less than the plastic did when they became cold
Answer:
The metal screws contracted more than the plastic did when they became cold.
Explanation:
The metal screws contracted more than the plastic did when they became cold. Thus option 3 is correct.
What is metal?Metal is defined as a class of substances distinguished by high electrical and thermal conductivity, as well as malleability, ductility, and high light reflectivity.
It can also be defined as a material having a high electrical conductivity, luster, and malleability that rapidly loses electrons to produce positive ions (cations).
Metals are classified based on their place on the Periodic Table.
Plastic is defined as a diverse spectrum of synthetic or semi-synthetic materials containing polymers as a primary component.
Thus, the metal screws contracted more than the plastic did when they became cold. Thus option 3 is correct.
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Mineral A can scratch Mineral B, but Mineral B cannot scratch Mineral A. Mineral C can scratch Mineral A. Which of the following is true?
A.Mineral C is softer than Mineral A.
B.Mineral A is softer than Mineral B.
C.Mineral C is harder than Mineral B.
D.Mineral A is harder than Mineral C.
the answer is B
Explanation:
mineral c is harder than B because A can scratch B and C can scratch A
Answer:
B.Mineral A is softer than Mineral B.
Explanation:
Nijar did an experiment to test a hypothesis that baking soda is just as effective a cleaner as bleach. He found this not to be true because more bacteria grew on surfaces cleaned with baking soda. Was there any benefit to Nijar's failed experiment?
A. Yes, all the lab equipment can be used again.
B. No, Najar did not discover which product is the better cleaner.
C. No, Nijar wasted his time testing this hypothesis.
D. Yes, Nijar's findings contributed to scientific knowledge.
Answer:
b no
Explanation:
What is height? Give an example.
IT WILL STALK YOU IN THE WOODS AT NIGHT...
when a person strikes a match, potential energy in the match is transformed into which types of energy?
Answer:
the answer is thermal and radiant
What is the density of an object if the mass is 240 g and the volume is 12 mL?
Answer:
20
Explanation:
Because 240÷12=20 m÷v=d
The object's density is given with the help of the mass of the object and with the volume. The density of the object weighing 240 gm with a volume of 12 mL is 20 g/mL.
What is density?The density of an object is the volume of the solution displaced by the mass of the object. It is given by the ratio of the mass to the volume of the object and the solution displaced.
Density is an important measurement formula that is used in fluid dynamics to determine buoyancy.
The density of the object is given as,
Density (D) = Mass ÷ Volume
Given,
Mass = 240 gm
Volume = 12mL
Substituting values in the above formula the density will be calculated as:
Density (D) = 240 gm ÷ 12 mL
D = 20 gm/mL
Therefore, the density of the 240 gm object will be 20 gm/mL.
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WHAT IS A ELECTROLYTE?THIS IS FOR MY PRESENTATION
Answer:
Explanation:
substance (as an acid or salt) that when dissolved (as in water) conducts an electric current.
Answer:
An electrolyte is a compound which produces ions when dissolved in a solution such as water. These ions have either a positive or negative electrical charge, which is why we refer to these compounds as electro-lytes
1. Antarctica is a frozen land, so cold and icy that no trees can grow there. Yet scientists have discovered fossils(remains preserved in rock) of ancient trees in Antarctica
What do you think this means
Answer:
This means that Antarctica once had a warmer climate.
Explanation:
Trees usually grow in warm climates, and Antarctica has little to no plant life.
What happens to an atom's overall charge if it loses or gains electrons?
Explain why metals react with non-metals
Answer:
A metal reacts with a non-metal to transfer electrons from the metal to the non-metal to complete their valance shell.
Explanation:
PLS HELP ASAP!!!!! IM TIMED!!!!!
1. compound
2. element
3. element
4. compound
5. compound
6. element
7. compound
8 element
PLEASE HELP ASAP
How do you think heating or cooling could be used to remove pollutant gases from a factory's exhaust before that smoke leaves the smokestack? What would happen to the pollutants?
Answer:
it will pollute things around it, because of the gas from the factory it s more likely to be pollanted same with the smoke as well!
Explanation:
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
Answer:
10.81, Boron
Explanation:
I love the explanation Khan Academy gives.
The average atomic mass of the element is 10.811 u.
What is Average Atomic Mass ?
The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element.
Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.
Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
Hence, differ in relative atomic mass but not in chemical properties; in particular, a bform of an element.
Therefore, The average atomic mass of the element is 10.811 u.
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what type of organic compound is produced in the photosynthesis
Answer:
glucose is produced as a sort of food for the plant
Can someone please help me finish this all?
I will give brainliest and a heart to the best answer!
Answer:2-liver because it doesnt belong to digestive system
3-esophagus because it doesnt belong to the circulatory system
4-heart because it doesnt belong to the nervous system
5-skull because it doesnt belong to the endocrine system
Explanation:
if an element is in period 5 what do we know about the electron configuration?
Answer: Number of energy shells
Explanation:
Periods = no. of shells
Groups = no. of electrons in outer shells
How many molecules are in 28 g of CO2 ?
Answer:
0.636 molecules or using significant figures, the answer is 0.64 molecules of CO2
Explanation:
Or 44 g/ mol of CO2
Explain how the type of an atom is defined?
How the type of an atom is defined is
An Atom is defined by how many Protons and Neutrons in its nucleus and electrons in its energy levels
From the question we are told that
How the type of an atom is defined
Generally
It is important to note that atoms are defined strictly by its Embodiment which are its electron protons and Neutrons
An Atom is defined by how many Protons and Neutrons in its nucleus and electrons in its energy levels
Therefore
An Atom is defined by how many Protons and Neutrons in its nucleus and electrons in its energy levels
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What would happen if you tried to break down a sample of sulfur?
Answer:
You can't actually break down pure sulfur because it is a element but with peroxide it would break down but only very slowly.
Explanation:
Sulfur forms different compounds with metals and non-metals also.When a sulfur sample is breakdown, there occurs a chemical change and the decomposed products such as sulphided forms.
What is sulfur?Sulfur is 16th element in the periodic table. It is a non metal and classified into the 16th group called oxygen family. Other group members of sulfur are thus, oxygen, tellurium, polonium and selenium.
Sulfur forms mostly covalent compounds by sharing its electrons with non-metals such as hydrogen, oxygen, nitrogen and some ionic compounds with metals such as iron, cobalt, nickel etc.
When a chemical change occurs, there will be a bond making or bond breaking and results in the formation of new products or the decomposition of the initial product into its constituents.
Sulfur produce a foul smell and when a sulfur sample is broken, it will form odour full sulphide ions or sulphates. For example in the case of metal sulphides, if broken the broken parts cannot be distinguished from the initial if it is chemically tested.
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Calculate the mass, in kilograms, of an object that occupies 0.253 dm3 and has a density of 4.14 g/cm3.
Answer:
m = 1.047 kg
Explanation:
Volume occupied by the object, V = 0.253 dm³
1 dm³ = 1000 cm³
0.253 dm³ = 253 cm³
Density of the object, d = 4.14 g/cm³
We need to find the mass of the object. Mass per unit volume is called density of an object.
[tex]d=\dfrac{m}{V}\\\\m=d\times V\\\\m=4.14 \ g/cm^3\times 253\ cm^3\\\\m=1047.42\ g[/tex]
or
m = 1.047 kg
So, the mass of the object is 1.047 kg.
When liquids are poured in a graduated cylinder the liquid will stick to the sides and create a curved line
called a
drop line
liquid line
meniscus
millimeter
Answer:
A. meniscus
Explanation:
read the point on the graduated scale that coincides with the bottom of the curved surface of the liquid. The curved surface of the liquid is called the meniscus.
how many moles of water are in 0.340 g of water?
Answer: 0.018 recurring?
Explanation:
moles = mass/mr
H20 = 2 + 16 = 18
0.340/18 = 0.018
Key Stage 3 Science - Chemistry
Question 1 of 50
What is the scientific term for the mixture formed by a solvent and a solute?
Enter your answer
Explanation:
A solution is homogenous mixture consisting of solute dissolving into a solvent.The solute is a substance that is being dissolved , while the solvent is the dissolving medium.
Answer:its called a solution
What identifies an atom as iron atom?
Answer:
Explanation:
An atom is composed of three particles -- protons, neutrons and electrons. The number of protons is the defining characteristic of an element, and this number also tells you how many electrons are present in a neutral atom. Therefore, iron -- with an atomic number of 26 -- has 26 protons and electrons.
If you go from the Earth to the Moon, will your MASS change?
Answer:
No matter if you are on Earth, the moon or just chilling in space, your mass does not change. But your weight depends on the gravity force; you would weigh less on the moon than on Earth, and in space you would weigh almost nothing at all.
Answer:
Your mass doesn't change on other planets, but the gravity and size of those planets affect how much you weigh. So, your weight depends upon the gravity of the planet and your weight keeps changing based on planet gravity. Mass is both a property of a physical body and a measure of its resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.
Explanation:
I am smart...Calibri is the superior font and green is the superior highlighter.
How many Electrons, Neutrons & Protons do
Sodium-12
Sodium-20
Nitrogen-15
Nitrogen-20 have?
Answer:
sodium
protons:11
neutrons:12
electrons:11
nitrogen
protons:7
neutrons:7
electrons:7
What Element am I?
I have 6 Valence Electrons.
I am in the third row.
My atomic mass is less than Selenium , but it is more than Oxygen. I need the answer ASAP
Answer:
The correct answer is - sulfur.
Explanation:
In the periodic table, there are 18 groups and 7 rows or periods arranged according to their atomic number or electronic configuration. In the question, it is mentioned that the desired element atomic mass is less than the atomic mass of the selenium which is 78.96, and more than oxygen which is 15.99 with 6 electron valence and present in the third row.
As it has 6 valency of electron it must be in the 16 group of the table that comprises the 6 valency and as it is located in the 3rd row it must be sulfur that also has an atomic mass between selenium and oxygen.
Is a salad a example of heterogeneous mixture?
Answer: Yes
Explanation: A heterogeneous mixture is a mixture that is different thoroughly.
Answer:
Yes!
Explanation:
A heterogeneous mixture does not have a uniform composition, unlike a homogeneous mixture. This means the mixture can easily be separated (by physical means). A salad has many different components such as lettuce, tomatoes, etc. that are easily distinguishable, making it heterogeneous.
I’ll give more points cuz like why not?
Answer:Are these free points
Explanation: because if so I want them
If a gas sample occupies 455 mL at 25°C and 744 torr, what will its volume be at STP?
Answer: It can be written as: V = nRT/P. "P" is pressure, "V" is volume, n is the number of moles of a gas, "R" is the molar gas constant and "T" is temperature. Record the molar gas constant "R". R = 8.314472 J/mole x K.
Explanation: That the answer
