Answer:
Physical change
Explanation:
The only change is in the shape, or length in this case, of the object. So its chemical makeup is still the same, it's still grass.
Mowing the lawn is considered a physical change. A physical change is a change in the physical properties of a substance or material without altering its chemical composition.
A physical change is a transformation that alters the physical properties of a substance, such as size, shape, or phase, without changing its chemical composition. In the case of mowing the lawn, the grass is physically cut into smaller pieces, but the individual grass blades themselves remain chemically unchanged.
When you run a lawnmower over a lawn, the sharp blades of the mower cut through the grass, trimming it to a desired height. This action changes the appearance and size of the grass, but it does not alter the identity or chemical composition of the grass. The grass blades are still composed of the same materials, such as cellulose and other organic compounds.
When you mow the lawn, you are cutting the grass blades into smaller pieces, but the grass itself remains the same chemically. The process of mowing only affects the physical appearance and size of the grass, not its fundamental composition.
Therefore, mowing the lawn is considered a physical change.
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Which is the best practice recommended in the safety video to mix and acid or a base with a solvent?
Answer:
Never pour water into acid but acid into water
Explanation:
If water is poured into extremely concentrated acid/bases, the rate of volatility and exothermic reaction is too rapid and might cause a chemical eruption, leading to acid burns.
Safety precautions hence dictate the reverse is practiced.
I believe this is a clear answer.
What gives the color and shape characteristics to flames in a fire?
Answer:
Different ions of different elements (usually metals) make a flame burn with a characteristic color when introduced into the reaction zone; the different colors are caused by the different quantized energy levels of the electrons in the different atoms.
Please help me fast, i don't understand it.
Oleophilic materials would not be used for ?
Answer:
An oleophilic material is an entity which exhibits a higher affinity for oil than other solvents. The non-polar nature and ability to form cluster-like structures called micelles are the characteristic properties of oleophilic materials.
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What is 6.9 x 10^-3 in standard form?
Answer:
0.0069
Explanation:
When converting between scientific notation try to remember that moving the decimal place to the left is positve and to the right is negative
Since you are changing from scientific to standard you will need to move to the left from the decimal point, making your answer 0.0069
what is the mass of 975 mL of mercury? Its density is 13.5 g/mL
Answer:
72.22 g
Explanation:
975 mL Mercury× 13.5 g/mL = 72.22 g
What is the elixir of life
Answer:
The elixir of life, also known as elixir of immortality and sometimes equated with the name philosopher's stone, is a potion that supposedly grants the drinker eternal life and/or eternal youth. This elixir was also said to cure all diseases.
Question 6
1 pts
A scientist is studying a homogeneous solid with a consistent and ordered arrangement in
the lab. Which specialty is the scientist most likely working in?
Answer:
He is probably studying Geomorphology.
Explanation:
Geology is the science that studies the composition, structure, dynamics, and history of planet Earth, the processes by which it has evolved including everything that has to do with its natural resources and with this the processes that affect the surface, and therefore, the environment.
Geomorphology is a branch of geosciences, more specifically geography and geology. One of his most interesting models explains the ways in which the earth's surface is the result of a consistent dynamic balance.
3 facts about the core
Answer:
The inner core is a hot, dense ball of (mostly) iron. It has a radius of about 1,220 kilometers (758 miles). Temperature in the inner core is about 5,200° Celsius (9,392° Fahrenheit). The pressure is nearly 3.6 million atmosphere (atm).
Explanation:
In recent research, strontium ions have been used for bone regeneration within humans as a calcium replacement. Based on your knowledge of periodic information, explain why is strontium a good substitute for calcium instead of other elements on the periodic table. [Hint: think about the way elements are organized based on their common characteristics] *
Answer:
Strontium, as opposed to other elements on the periodic table (with the exception of others in the same group/column i.e., the vertical direction), is a good substitute for Calcium because they are in the same group.
Explanation:
This is because elements of the same group behave similarly and have similar properties. This is due to the fact that elements of the same group (in the vertical direction) have the same number of valence electrons.
What is the maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen?
Answer:
2
Explanation:
Oxygen has 6 electrons in its valence shell. Since an atom can have a maximum of 8 electrons in the valence shell, oxygen has 2 empty spots in its valence. This means that oxygen can make 2 single covalent bonds.
The maximum number of covalent bonds that an oxygen atom with atomic number 8 can make with hydrogen is: 2.
Valency can be defined as a measure of the combining power of a chemical element with other atoms to form a molecule or chemical compound. Typically, valency is measured by the amount of hydrogen atoms that a chemical element can combine with or displace to form a molecule or chemical compound.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others.
From the periodic table, we know that an oxygen atom has an atomic number of eight (8). Thus, oxygen has six (6) electrons in its valence shell and two (2) empty shells to form a covalent bond with hydrogen.
Generally, the maximum number of electrons an atom can hold in its valence shell is eight (8) and since oxygen has has six (6) electrons in its valence shell; it ultimately implies that the maximum number of covalent bonds that an oxygen atom with atomic number of eight (8) can make with hydrogen is two (2) covalent bonds.
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If you find the mass of a sample to be 42.1 g and the actual mass is 42.0 g. What wold be the percent error
Answer:
0.24%
Explanation:
The following data were obtained from the question:
Measured value = 42.1 g
Actual value = 42 g
Percentage error =?
Percentage error can be obtained by using the following formula:
Percentage error = |Measured value – Actual value | / Actual value × 100
With the above formula, we can obtain the percentage error as follow:
Measured value = 42.1 g
Actual value = 42 g
Percentage error =?
Percentage error = |42.1 – 42| / 42 × 100
Percentage error = 0.1/42 × 100
Percentage error = 10/42
Percentage error = 0.24%
Therefore, the percentage error is 0.24%
Identity which statement is true:
A. Isotopes of the same element have the same atomic number and mass number, but a different
number of neutrons.
B. Isotopes of the same element have the same mass number and different atomic numbers.
C. Isotopes of the same element have the same atomic number and different mass numbers.
D. Isotopes of the same element have the same number of neutrons and a different number of protons.
Isotopes of the same element have the same atomic number and different mass numbers. Hence, option C is correct.
What are Isotopes?Isotopes are defined as chemical species which have the same number of protons but differ in the number of neutrons.
It can also be said that they are the chemical species of the same element which have the same atomic number but have different mass numbers.
For Example, C12 and C14 are the isotopes of carbon elements, which have the same atomic number but a different mass numbers.
Hence, option C is correct.
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What is the relationship between the sequence of DNA’s subcomponents and the properties of DNA? 1. The amino acid sequence along a segment of DNA determines the three-dimensional shape of the protein that will be produced. 2. The deoxyribose sequence in a DNA molecule determines the complementary molecule that will form double stranded DNA. 3. The nitrogenous base sequence along a segment of DNA determines the amino acid sequence that will be produced. 4. The sequence of enzymes in a DNA molecule determines the direction in which DNA will be transcribed into mRNA.
Answer:
3.
Explanation:
There are four nitrogenous bases in a DNA including guanine (G), adenine (A), cytosine (C) and Thymine (T) and together they form the nitrogenous base sequence arranged in a specific order of three letters such as GAC and TAG to form a genetic code.
These nitrogenous base sequences forming genetic code are amino acid specific and determine the amino acid sequence in DNA. for example: CTT determines leucine and GTT determines valine.
Hence, the correct option is "3".
2. Name a tool that is good for measuring the volume of a liquid accurately.
3. Name a tool that is good for estimating the volume of a liquid.
4. What tool would you use to measure the dimensions of a bedroom?
Answer:
[See Below]
Explanation:
✦ A beaker of liquid would measure the volume of a liquid.
✦ A graduated cylinder is good for estimating the volume of a liquid.
✦ You'd most likely use a tape measure to measure the wall length and width.
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What is the frequency of individuals with doctorates who work in the field of physical science? 0-1,000 1,000-2,000 2,000-3,000 3,000-4,000
Answer: The answer is option B
1,000-2,000
Explanation:
How many grams are there in 1.45 kg?
Answer:
1.45 kg
Explanation:
common sense ok
Answer:
1450 grams are in 1.45 kilograms
If the size, mass, and arrangement of atoms affect the density of a substance. How might these factors work together to cause a substance to have a low density?
Answer: The size, mass, and arrangement of atoms affect the density of a substance. How might these factors work together to cause a substance to have a high density? A substance with smaller more massive atoms that are close together is going to have a higher density.
Explanation:
What is the correct representation of 702.0 g in scientific notation?
A. 7.02 x 103g
B. 70.20 x 101 g
C. 7.020 x 102 g
D. 70.20 x 102 g
(answer fast !!)
Answer:
C. 7.020 x 10^2 g
Explanation:
To convert to scientific notation, move the decimal until there is only one digit greater than 1 and less than 10 before the decimal. In this case, the 7. (Depending on the conversion, you will either move the decimal to the left or right. In this question, you will need to move it left. When you move the decimal left, you inherently think you are moving it in the negative direction, but your final answer will be a positive exponent. The opposite is true for movement in the right direction, leaving a negative exponent in your final answer.)
Then, count the number of places that you moved the decimal from the original number (in this case, you moved it 2 decimal places to the left).
Because you moved the decimal 2 places to the left (-), when you write it in scientific notation, you want to annotate the exponent as the opposite, (+), so that you do not lose the equivalence of the original number (in this case, state it as 10^2 as in choice C).
Note: Once you do your conversion, you can plug it into your calculator and press "=" to verify that you did not change the number in doing your conversion.
Taking into account the definition of Scientific notation, the correct representation of 702.0 g in scientific notation is option C. 7.020×10² g.
First of all, scientific notation is a quick way to represent a number using powers of base 10. This notation is used to be able to express very large or very small numbers very easily.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number. n = a whole number, which is called an exponent or an order of magnitude. Represents the number of times the point decimal is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.In this case, to write the number 702.0 in scientific notation, the following steps are performed:
The decimal point is moved to the left as many spaces until it reaches the right of the first digit. This number will be the value of a in the previous expression. Then a = 7.020 The base 10 is written with the exponent equal to the number of spaces that the decimal point moves. This is a positive number because the decimal point is shifted to the left, and it will have a value of n = 2.So, the correct representation of 702.0 g in scientific notation is option C. 7.020×10² g.
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10 pts
A student fills a graduated cylinder with water to a volume of 22.4mL. After adding a
metal sample, the volume of the water rises to 26.2 mL. What is the volume of the
metal sample?
3.8 ml
0 22.4 mL
0 26.2 mL
O 48.6 mL
Answer:
3.8
Explanation:
True or False: PERIODS on the periodic table run up and down.
Answer:
True
Explanation:
I guessed XD But I also used Google and that's what I got
Which statement accurately describes humidity?
O Humidity is a measure of dew in the air.
O Colder air promotes more evaporation.
O Cold air holds more moisture than warm air.
O Humidity refers to the amount of water vapor in the air.
Humidity refers to the amount of water vapor in the air accurately describes it.
What is Water vapor?This can be defined as the gaseous phase of water as a result of heating in the atmosphere.
The amount of the water vapor in air is what is referred to as humidity which makes option D the most appropriate choice.
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wafting the air above a chemical is one way to it directly
Answer:
Explanation:
All it takes is a momentary lapse in concentration. When you are in the laboratory and take a direct sniff of the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs.
Which of the following properly describes the movement of atoms as they represent the states of matter? Atoms making liquids have less attraction than solids, but more than gases Atoms making liquids have less attraction than solids, but more than gases The atoms making liquids are closer together than atoms making solids. The atoms making liquids are closer together than atoms making solids. The atoms that make solids do not move at all which is why they keep their shape. The atoms that make solids do not move at all which is why they keep their shape. Atoms making gases have the least amount of kinetic energy while solids have the most.
Answer:
Atoms making liquids have less attraction than solids, but more than gases
Explanation:
The attraction between atoms in different molecules in a solid is very strong due to strong intermolecular forces present in a solid. However, such intermolecular forces are weaker in liquids than in solids.
This implies that the solid has higher intermolecular forces of attraction compared to gases and liquids. Based on the negligible degree of intermolecular forces between them, a gas has the weakest intermolecular forces hence the atom has very minimal interaction between them.
Fill in the blanks with the correct word. During diffusion, molecules move from areas of concentration to areas of Diffusion does not require to move molecules. concentration. Previous Activity
TRY A LITTLE -_-
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Answer:
1) higher
2) lower
1) energy
Explanation:
hope this helps you.
I would really like a brainliest :D
thank you and have a nice day.
Answer:
1) higher
2) lower
1) energy
Explanation:
i need help with these three
At 20 degrees Celsius the density of mercury is 13.6 g/cm cubed. What is the mass of 50.0 ml of mercury at 20 degrees Celsius?
The value of mass is 680 g.
Density:-
It is defined as mass per unit volume.
Given:-
[tex]Density=13.6\ g/cm^{3} \\Volume=50\ mL[/tex]
Calculate mass as follows:-
[tex]Density=Mass/Volume\\13.6\ g/cm^{3} = Mass/50.0\ mL\\Mass=13.6\ g/cm^{3} \times50.0\ mL[/tex]
Relationship used:-
[tex]1\ cm^{3} =1\ mL[/tex]
[tex]Mass=680\ g[/tex]
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what are the trends of group 1 metals on the periodic table as the metals go down?
Answer:
The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.
Explanation:
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what claim is being made?
Answer:
D
Explanation:
because it's saying the diet soda has more calories then regular soda it's like someone claimed you of doing something you didn't do and they don't know that
ln what ways are solid- solid mixture categorized
Answer:
homogeneous mixture