Answer:
0.844 mol Na
Explanation:
19.4 g Na x (1 mol Na/22.99 g Na) = 0.844 g Na
What is the reason developed nations are more likely to consider solutions to environmental problems than less developed nations?
Answer:
most developed nations.....
Explanation:
have more people and more resources to fix problems
If you run a 100-meter race in 20 seconds, what is your average speed during the race?
Answer:
5 m/s
Explanation:
5 meters per second
100 total meters in 20 seconds
100/20
5
5 meters per second
What is the density of a substance that has a mass of 90 g and a volume of 18 cm3?
Answer:
[tex]\boxed{\tt d=5g/cm^3}[/tex]
Explanation:
The density of a substance can be found using the following formula.
[tex]d=\frac{m}{v}[/tex]
where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume.
The mass of this substance is 90 grams and the volume is 18 cubic centimeters.
[tex]m= 90 g \\v= 18 cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{90 g}{18 cm^3}[/tex]
Divide 90 grams by 18 cubic centimeters.
[tex]d=5 g/cm^3[/tex]
The density of the substance is 5 grams per cubic centimeter.
Which best explains why their traits are similar to their parent's traits? Choose the answer that best matches your thinking. (Acquired = to obtain or get) *
A. They inherited their traits from their parents.
B. Their traits are acquired, not inherited
C. Their traits are both acquired and inherited.
D. Their traits are neither inherited nor acquired; they come from nature.
Answer: A
Explanation:
Describe two ways that electrons form chemical bonds between atoms.
HELPPP PLEASEEEE
Answer: one way is that the atom will share an electron. Sorry i only know 1 way
Explanation: for example, if Cl with 7 electrons wants to bond with Ar, that has a conplete set of 8 electrons, then Ar will share its electron to fill in the space of the missing electron in Cl.
*JUST AN EXAMPLE. IM NOT SAYING CL AND AR DO FORM A BOND.
Answer:
ionic bonds and convalent bond
Explanation:
by taking the electrons it means convalent bond
but if you're borrowing the electrons it mean ionic bond
Is malleability an extensive physical property or an intensive physical property? Explain your answer
15. Convert 24 mi/hr to ft/min
Na-23 has 12 neutrons. What is its atomic number?
O A. 11
O B. 12
O c. 23
O D. 34
Answer: D
Explanation:
Convert 16 years to days?
Answer:
16 years = 5840
Explanation:
multiply the time value by 365
A chemistry student’s height is measured at 68.5 inches. How tall is the student in cm?
mm, does anyone know this?
The density of ice is 0.917 g/cm3. How much volume does 52.3 g of ice occupy? Show your work.
Answer:
The answer is
57.0 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} [/tex]
From the question
mass of ice = 52.3 g
density = 0.917 g/cm³
The volume is
[tex]volume = \frac{52.3}{0.917} \\ = 57.0338058[/tex]
We have the final answer as
57.0 mLHope this helps you
Which civilization linked Venus with motherhood and childbirth, and realized it was one object rather than two?
A. Aztecs
B. Mayans
C. Babylonians
D. Ojibwe
Answer:
The correct options is;
C. Babylonians
Explanation:
The Babylonians showed to have had knowledge that the Evening Star, which is the appearance of the planet Venus in the west, after sunset and the Morning Star which is the bright, white object that can be seen early in the morning in the Eastern sky are one and the same object as indicated in the middle of the seventeenth century BCE compiled Venus tablet of Ammisaduga.
READING CHECK
7. What is the difference between a compound and a mixture?
ker notes
Which best describes the trends in electronegativity on the periodic table?
Electronegativity increases up and to the right.
Electronegativity increases down and to the left.
Electronegativity decreases up and to the left.
Electronegativity decreases down and to the right.
Answer:
A. Electronegativity increases up and to the right.
Explanation:
edge 2021
Electronegativity increases up and to the right. Hence, option A is correct.
What is a periodic table?The periodic table is a tabular arrangement of the chemical elements organized with an increasing atomic number.
Electronegativity is a chemical property that explains the trend of an atom to attract a shared pair of electrons towards itself. As you move from left to right across the periodic table, electronegativity increases, and as you move down the table electronegativity decreases.
Hence, option A is correct.
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Write this number in scientific notation: 0.000467
Answer:
467× 10^-6 or 467 × ten to the power of negative six - hope this helps
can someone plss help me asap !!
which metal has a soluble carbonate, chloride and sulfate ?
a. copper
b. potassium
c. zinc
d. barium
What is the smallest division on this balance? 0.1 g 0.01 g 0.001 g 1 g
Answer:0.001g
Explanation:
the number with the most zeros at the beginning is always the smallest
I need help on this please
Answer: C
Explanation: I just did it
The Periodic Table is arranged according to?
the number of electrons that each element has.
the boiling point of the elements.
the reactivity of the elements.
the number of protons each element has.
Answer:
The number of protons each element has.
Explanation:
The periodic table is arranged by atomic number, which is the number of protons in the nucleus of each element.
Answer:
The number of protons each element has.
Explanation:
The number of protons each element has is also known as the atomic number. Elements are arranged from left to right and top to bottom in order of increasing atomic number. The order generally coincides with increasing atomic mass. The rows are called periods.
Can someone help me please
Answer:
unicellular means having one cell and multicellular means having many cell
example of unicellular organism are euglena,amoeba and paramecium
example of multicellular are man,mushroom and
dog
Explanation:
hope it helps you
What is a variable? A. Something that must be kept constant in an experiment. B. A value or characteristic that can take different values. C. A statement that explains a phenomena and can be tested. D. An educated guess used in an experiment.
Answer:
The answer is B, a value or characteristic that can take different values
Explanation:
ex.) 1s + 3
s is the variable
Variables are the varying or unchangeable data or factors in an experimental design. It can be defined as a characteristic that can have different values. Thus, option B is correct.
What is the meaning of variables?Variables are experimental characteristics that may be consistent or can be changeable. In an experimental design, the variables are used to analyze the cause and effect.
The variables of an experiment can be dependent, independent, or controlled. The varying factors in an experiment to analyze are called independent variables.
The factors that depend and respond to the effect of the independent variables are called dependent variables. These all values are contrasted to the control group with a fixed value.
Therefore, in option B, the variables are the characteristics with the same or different values.
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A cylinder container is filled with air. It’s radius is 6.00cm and it’s height is 3.50cm. What is the volume of air inside? (Use 3.14 for TT) Hurry Guys!!!
Answer:
396 mL
Explanation:
the measure of the number of units, such as atoms, molecules, or ions of which all matter is made
Answer:
Particles of matter.
Explanation:
In science, matter can be defined as anything that has mass and occupies space. Therefore, any physical object that is found on planet Earth is typically composed of matter.
Matter are known to be made up of atoms and as a result has the property of existing in states. The three (3) classical states of matter are;
1. Gas: is the state of matter in which the physical substance has no definite shape or volume and as a result fills all available space. Also, gases are easily compressible and can flow. Examples of gases are hydrogen, oxygen, argon, nitrogen etc.
2. Solid: is the state of matter in which the physical substance has a definite shape and fixed volume but not compressible. Examples of solids are pen, screwdriver, television, car etc.
3. Liquid: is the state of matter in which the physical substance can be poured and it takes the shape of its container. Also, liquids generally have a definite volume. Examples of liquids are urine, water, milk, blood etc.
Particles of matter can be defined as the measure of the number of units, such as atoms, molecules, or ions of which all matter is made. These particles of matter are typically tiny, minute or incredibly small and as such can not be seen with the naked eye. Also, the particles of matter are usually in a continual state of motion and are primarily held together by a bond energy.
Additionally, the four (4) properties that are peculiar to matter are: flow, volume, shape and compressibility.
Use the drop-down menu to complete the sentence.
When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n)
.
Answer:
compound :)
Explanation:
Atoms are said to be the smallest unit of substances of a chemical nature. One carbon atom combined with two oxygen atoms results in the formation of a compound. Thus, option B is correct.
What is a compound?A compound is defined as a substance that is made of more than one element and molecules that are different or the same in nature. They get linked together through a chemical bond.
Carbon and oxygen are two different elements that react chemically to form a covalent form between them. As a result, a compound called carbon dioxide is formed.
On the other hand, an element is a pure form of the atom, and isotopes are atoms with identical atomic numbers and different atomic masses. Ions are said to be atoms with charges on them.
Therefore, option B. carbon dioxide is a compound.
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Your question is incomplete, but most probably your full question was, When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n) A.) Element. B.) Compound. C.) Isotope. D.) Ion.
even tho im an expert on brainly i still need help bc science isn't my thing HELP PLS
Where in an equation for photosynthesis does carbon dioxide belong?
on the left side, because it is a product
on the right side, because it is a product
on the right side, because it is a reactant
on the left side, because it is a reactant
Answer:
(d) on the left side ,because it is a reactant.
Answer:
(D) On the left side, because it is a reactant.
Define an endothermic reaction
Why can a container never be half full of air
PLEASE HELP I WILL HIVE YOU BRAINLYEST
8. Develop a relationship in the form of a single sentence or equation) that can predict the charge based on the number
and types of particle.
Answer:
Charge of an ionic element = Number of protons (p) - Number of electrons (e)
Explanation:
Atoms of elements are made up of three subatomic particles viz: neutron, proton and electron. The proton is the subatomic particle that carries the positive charge (+) while the electron is the subatomic particle that carries the negative charge (-).
The atom of any element is NEUTRAL when the number of protons in its nucleus is equal to the number of electrons surrounding its nucleus. However, an ion (charged atom) arises when there is a difference in the number of protons and electrons in an atom.
The equation to determine the charge an ion will carry is: NUMBER OF PROTONS (p) - NUMBER OF ELECTRONS (e).
This equation shows that an ion will be:
- positively charged if the number of protons is > number of electrons.
- negatively charged if the number of protons is < number of electrons.
I need all the help that i can get
Answer:
A.ns .is d ok I think it was very much helpful to you
