Answer:
mirrors do not have a color, many people believe they are green because they reflect the most green light back into our eyes.
7. Which diagram best represents the relative locations of the structures in the list below? A-chromosome B-nucleus C-cell D-gene can anyone help mesc
the genes are located within the chromosomes. the chromosomes are inside the nucleus .the nucleus is inside the cell, therefore the correct diagram in B
What do you notice about the density of the sinking objects?
Answer:
if its less Dense than water it will float, if it's more Dense, than water it will sink. if an object weighs more than the same amount of water then it will sink but if it weighs less it will float
Explanation:
select the correct answer
Democritus was a Greek philosopher living from c. 460 B.C. to c. 370 B.C. He wrote several suppositions on the properties of matter.
Which of the following statements most closely describes Democritus's ideas about matter?
A.
All matter is composed of tiny particles that can vary in shape, size, and weight.
B.
All matter is composed of tiny particles that either have a positive or a negative charge.
C.
Solid matter is composed of square-shaped particles and liquid matter is composed of flat particles.
D.
Solid matter is composed of atoms and liquid matter is composed of elements.
How many significant figures do the following numbers have?
7.
36,004
8.
10.040
9.
0.03460
10.
2.804
11.
4000
12.
13.04 x 104
Answer:
7. 5
8. 4 or 5
9. 3 or 4
10. 4
11. 1 or 2 or 3 or 4
12. 6
Explanation:
7. 5
8. 4 (excluding the 0) or 5 (including the 0)
9. 3 (excluding the 0 at the back) or 4 (including the 0 at the back)
10. 4
11. 1 or 2 or 3 or 4 (according to the number or 0s included)
12. 13.04 × 104 = 1356.16
ans: 6
A student makes the following hypothesis: If the amount of sugar increases then the candy
bar will taste sweeter. Which is the independent variable?
Answer: sugar
Explanation:
Harley was late to physical science class and missed the beginning of the
notes, including the title. These are the notes she took:
-Makes up everything
-Can be solid, liquid, or gas
-Has mass and takes up space
-Is made up of atoms, or tiny particles that are the smallest unit of matter
What would be the best title for her notes?
matter
weight
mass
atoms
Calculate the energy of light that has a frequency of 8.8 * 10^16 s-1.
Answer:
Option C. 5.8×10¯¹⁷ J
Explanation:
The following data were obtained from the question:
Frequency (f) = 8.8×10¹⁶ s¯¹
Thus, we can obtain the energy of the light by using the following formula:
E = hf
Where E is the energy.
h is the Planck's constant.
f is the frequency.
Frequency (f) = 8.8×10¹⁶ s¯¹
Planck's constant = 6.63×10¯³⁴ Js
Energy (E) =..?
E = hf
E = 6.63×10¯³⁴ × 8.8×10¹⁶
E = 5.8×10¯¹⁷ J
Therefore, the energy of the light is 5.8×10¯¹⁷ J.
For many years scientists thought that dinosaurs rapidly replaced their ancestors. New information shows that dinosaurs and their non-dinosaur ancestors may have
existed together for tens of millions of years. Which evidence MOST likely made it possible to support the idea that dinosaurs and their ancestors coexisted for
millions of years?
A. Fewer fossils were found of amphibians than of dinosaurs.
B. More fossils found were of larger organisms than of dinosaurs,
C. Herbivore bones were found in each rock layer.
D. Bones of three different species were found in the same rock layer
Answer:
The evidence that is most likely to support the idea that dinosaurs and their ancestors could have coexisted for millions of years is bones of three different species were found in the same rock layer (option D).
Explanation:
Fossils have been the strongest evidence of the existence of extinct species in the remote past. The discovery of some species and their possible ancestors in the same layer of rocks confirms the possibility of the coexistence of evolutionary forms of the same species, for a great period of time.
Once the fossils have been found, paleontologists use molecular genetic techniques to identify the fossils and their relationship with others found in the same place.
The approach suggests that it is not necessary for a species to become extinct in order for its evolutionary descendant to appear, considering coexistence for thousands or even millions of years.
The other options do not provide solid evidence to support this approach.
A. Fewer fossils were found of amphibians than of dinosaurs, which does not specify an evolutionary relationship.
B. More fossils found were of larger organisms than of dinosaurs, which is not true, because species descended from dinosaurs tend to be smaller.
C. Herbivore bones were found in each rock layer, not related to the approach.
Explain three conditions under which magma can form.
Answer:
Magma is formed by both wet and dry melting processes. By melting different parts of the layers of the earth, basaltic, rhyolitic and andesitic magma will be formed. Wet and Dry Melting In order for magma to form, wet or dry melting of rocks or minerals must occur.
Explanation:
I got it from google!
Answer:
it may cause temperature increases in or pressure decreases on mantle rock, when water is added to rock. decreasing pressure and adding fluids
Explanation:
the figure shown has two parallel lines cut by a transversal
Comparing Science and Pseudoscience
Which are examples of science rather than pseudoscience? Check all that apply.
People can get rid of hiccups by holding their breath.
The US surgeon general's 1964 report declared that smoking cigarettes was linked to cancer
Going outside with wet hair will cause a person to catch a cold
The average global temperature of the Earth has increased by almost two degrees in the last century.
People should not swim right after eating because they could develop severe muscle cramps and drown.
Answer:
The US surgeon general's 1964 report declared that smoking cigarettes was linked to cancer .
The average global temperature of the Earth has increased by almost two degrees in the last century.
Explanation:
Science and pseudoscience differs in terms of scientific methods involved in any study. Science deals with the practices and beliefs that undergo a method of scientific study. Pseudoscience is the term associated with the ideas and beliefs that tend to be scientific in nature but they fail in their execution of following the scientific methods.
From the given options, two of them are the examples of science and not pseudoscience.
why does algae grow in a lake
Answer:
Light Exposure and Water Movement. Along with food, algae require the right amount of light to thrive. ... Filamentous algae will typically grow around the shoreline of a pond or lake because this is where the shallower water is.L
Hope that helps :)
Answer:
algae will typically grow around the shoreline of a pond or lake because this is where the shallower water is.
Explanation:
What do you look at to tell the reactivity of an atom?
Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
Explanation:
I hope this helped!
30 points please help fast !!!Gold has a density of 19.3 g/cm^3, and a volume of 17.78 cm x 9.21 cm x 4.45 cm. What is the mass of 3 gold bars ?
Answer:
17.76 cm x 9.21 cm x 4.45 cm = 727.9 cc. Calculate the weight of the gold bar using the density of gold, which is: 19.3 g/cc. Use the density ...
A mbxture of iron and sulfur can be separated by attracting the Iron particles with a magnet. If the iron and sulfur mixture is heated strongly, iron (II) sulfide forms, which is no longer magnetic and cannot be separated by
physical methods. What is Iron (II) sulfide?
A heterogeneous mixture
B. compound
C. homogeneous mixture
D. element
Answer:
C. homogeneous mixture
1. How many cm are equal to 1.45 m?
2. How many kg are equal to 325 g?
3. How many mL are equal to .0024 L?
4. How many km are equal to 1.55 x 104 m?
5. How many mm are equal to 4.75 x 10-2 m?
6. How many cg are equal to 0.459 kg?
7. How many km are equal to 5,995 dm?
8. How many mg are equal to 450 g?
9. How many mm are equal to 0.003 dm?
10. How many ML are equal to 4.567 x 104 mL?
Explanation:
(1) 1 m = 100 cm
1.45 m = 100 × 1.45 cm = 145 cm
(2) 1 kg = 1000 g
325 g = 0.325 kg
(3) 1 L = 1000 mL
0.0024 L= 2.4 mL
(4) 1 km = 1000 m
[tex]1.55\times 10^4\ m=1.55\times 10^4\times 0.001=15.5\ km[/tex]
(5) 1 mm = 0.001 m
[tex]4.75\times 10^{-2}\ m=4.75\times 10^{-2}\times 1000\ mm\\\\=47.5\ mm[/tex]
(6) 1 kg = 100000 cg
0.459 kg = 45900 cg
(7) 1 dm = 10⁻⁴ dm
5,995 dm = 5,995 × 10⁻⁴ km
(8) 1 g = 1000 mg
450 g = 450000 mg
(9) 1 dm = 100 m
0.003 dm = 0.3 mm
(10) 1 mL = 0.001 l
4.567 × 10⁴ mL = 45.67 L
PLEASE HELP!!!
What is the mass number of the most abundant isotope of gallium, atomic number 31?
Answer:
69Ga=68.925580(3),71Ga=70.9247005(3)
In a sample of a solid the particles are
A.
not moving.
B.
vibrating about a fixed position.
C.
sliding past each other.
D.
moving independently around the container.
Which element can join with other elements to form covalent bonds? beryllium (Be) carbon (C) cesium (Cs) iron (Fe)
Answer:
Carbon (C)
Explanation:
Carbon is the only nonmetal there and covalent bonds happen between two nonmetal atoms
The element can join with other elements to form covalent bonds is carbon atom.
What is covalent bond?Covalent bonds are those bonds which are formed by the sharing of electrons between two atoms and electronegativity difference between given atoms should be less.
So mostly covalent bonds are generally formed between the carbon and hydrogen atom by the sharing.
Beryllium, cesium and iron are metals which will form any compound by the donation of electron in the cationic form.Hence carbon will form covalent bond.
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HELP ITS DUE IN 10 MIN How long will it take an object to move 100 meters if the object is traveling with an average
speed of 13 meter per second? (Answer to the nearest 100th decimal with units)
Answer:
Would it be 7.69 seconds?
Explanation:
What do the nitrogen-fixing bacteria in
the soil/roots of plants convert the
nitrogen gas to? Select all that apply.
Nitrite
Ammonia
Ammonium
Nitrate
Nitrate compounds is the answer
Which statements accurately describe volume? Check all that apply. Volume is a physical property of an object. Volume is measured using a balance. The volume of a solid changes with the shape of the container. One unit of volume is the milliliter. Liquids and solids have constant volumes.
Answer:
- Volume is a physical property of an object.
- One unit of volume is the milliliter.
- Liquids and solids have constant volumes.
Explanation:
Statement that are true about volume are;
Volume is a physical property of an object.One unit of volume is the milliliter.Solids have constant volumes.What is volume?volume can be regarded as a 3-dimensional space enclosed by a boundary or occupied by an object.
Therefore, Volume is a physical property of an objec and One unit of volume is the milliliter.
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In a neutral aluminum atom with atomic number 13, how many
protons, neutrons and electrons are there?
Answer:
atomic number=proton=electron= 13
neutrons= 14
Process for the extracting o acting oxygen and from iron oxide containing ores
Answer:
Smelting reduction employs two units: in the first, iron ore is heated and reduced by gases exiting from the second unit, which is a smelter-gasifier supplied with coal and oxygen. The partially reduced ore is then smelted in the second unit, and liquid iron is produced.
The average atomic mass of copper is 63.55 amu. If the only two isotopes of copper have masses of 62.94 amu and 64.93 amu, what are the percentages of each?
Please show work!!!
Explanation:
Let relative ratio of one isotope (62.94 u) be X
Then, relative ratio of other isotope (64.93) will be (1 - X)
Now,
(62.94)x + (64.93)(1 - x) = 63.55
1.99x = 1.38
X = 0.69
Relative Abundance :
(62.94 u) isotope = 69 %
(64.93 u) isotope = 31 %
2. Match each diagram with its correct description. Diagrams will be used once.
.
O
A
B
с
D
E
Pure Element - only one type of atom present.
Mixture of two elements – two types of uncombined atoms present.
Pure compound - only one type of compound present.
Mixture of two compounds - two types of compounds present.
Mixture of a compound and an element.
Answer:
1.C
2.E
3.B
4.A
5.D
Explanation:
C- Pure element - one type of atom present
E- Mixture of two elements - two types of uncombined atoms present
B- Pure compound - only one type of compound present
A - Mixture of two compounds - two types of compounds present
D- Mixture of a compound and an element
The images represent;
Pure elementMixture of two elementsPure compoundMixture of two compoundsMixture of a compoundIn image C, there is only one kind of uncombined representation, this corresponds to a pure element
Image E has two uncombined representations which corresponds to a mixture of two elements
Image B consists of only one type of combined representation. This corresponds to a pure compound.
Image A shows two kinds of combined representations. This corresponds to a mixture of two compounds.
Image D consists of some combined representations and some uncombined representations. This corresponds to a mixture of a compound and an element.
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a) How are physical and social systems alike?
b) How are they different?
Answer:
no
Explanation:
physical is human touch for example. while social is taking and hanging out or just talking on the phone.
HURRY!! 30 points!!
In the process of photosynthesis, plants use carbon dioxide, water, and energy to form carbohydrates and oxygen Which of the following best explains how plants follow the Law of Conservation of Mass
The reaction uses energy to produce a product without energy
A gas (carbon dioxide) and a liquid (water) use energy to produce a solid (carbohydrates).
The amount of each element that begins photosynthesis equals the amount of each element that is produced
The amount of carbohydrates at the beginning of photosynthesis equals the amount of oxygen that is produced
Answer:
The amount of each element that begins photosynthesis equals the amount of each element that is produced
Explanation:
Photosynthetic reaction is the combination of water and carbon dioxide with the aid of light energy to form glucose and oxygen. The amount of reactants are equal to the amount of product in this reaction. Hence, option C is correct.
What is synthesis?Photosynthesis is a biochemical process by which water and carbon dioxide combines to form energy and oxygen with the aid of light energy. The green pigment chlorophyll a photoactive substance absorbs sufficient heat energy for this process.
According to mass conservation law, mass can neither be created nor be destroyed. Thus, in a chemical reaction, the total mass of the reactants will be equal to the total mass of products.
The photosynthetic reaction is written as follows:
[tex]\rm 6CO_{2} + 6H_{2}O \rightarrow C_{6}H_{2}O_{2} + 6O_{2}[/tex]
It is clear from this balanced reaction that, all the elements in each side are equal in number and thus no mass is lost or gained and thus, obeys mass conservation law. Hence, option C is correct.
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chemical property
a characteristic of a substance that is observable only
when the substance ___ with another substance
Answer:
Characteristic of a substance that Cannot be observed without altering the identity of the substance.
Explanation:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.
