Answer:
The charge of an atom is the number of protons minus the number of electrons.
A student has a sample of solid calcium. It is shiny and metallic looking. He squeezes a pipet of concentrated sulfuric acid onto the calcium. Bubbles are produced and the calcium appears to disappear. The test tube gets hot. What kind of change occurred?
Answer:
Physical change
Explanation:
There are two types of changes: physical change and chemical change. Physical change is defined as the change that changes the physical appearance of the substance and do not affcet the chemical composition of the substance whereas chemical change causes changes in the chemical composition of the susbstance.
The given example shows physical change because solid calcium undergoes sublimation. process in which a solid substance changes into gaseous phase directly without undergoing liquid phase.
Hence, the correct answer is "Physical change".
It's how many atoms are in two water molecules (H2O)?
Answer:
The chemical formula for water is H2O which means that every molecule of water has 2 atoms of hydrogen (H) and one atom of oxygen (O). Here comes the key part. From the Periodic Table of Elements, one sees that one mole of hydrogen atoms weighs 1 gram while one mole of oxygen atoms weighs 16 grams.
Explanation:
:)
The number of atoms present in two water molecules is 6 atoms. 4 hydrogen atoms and 2 oxygen atoms.
What are atoms?Atoms are the basic unit of a substance. An atom is made of a nucleus, protons, neutrons and electrons. Different atoms combines to form a molecule and molecules combines to form compounds.
Water has the formulas H₂O, thus one molecule of water contains 2 hydrogen and one oxygen. Therefore, two molecules of water that is (H₂O)₂ have 4 hydrogen and 2 oxygens thus, a total of 6 atoms.
Hence, the number of atoms present in two molecules of water is 6.
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Is 5O2 a Element or Compound?
what acts as a buffer for seawater ?
Answer:
The bicarbonate and carbonate ions.
Explanation:
Probably not he answer your looking for though. So, CO2.
Find the percent of oxygen in CaClO3)2 Show your work
8. What is Planck's law?
O F = hm
O F = MA
O E = hf
O E = mc (squared)
Answer:
O E = hf
Explanation:
How many grams are in 1.98 x 1024 formula units of NaCl?
Answer:
There are 2027.52 formula units of NaCl
Explanation:
plz mark me brainlest
Groups of specialized cells working together are called
Groups of specialized cells working together are called tissue
The volume of an unknown liquid is shown in the graduated cylinder. The mass of the liquid is 105 grams.
What is the density of the unknown liquid?
A 3500 g/mL
B .33 g/mL
C 3.0 g/mL
D 3.3 g/mL
Answer:
the answer is c
Explanation:
What happens to the tape at the closer markers compared to the markers that are further away?
Plz help!
Covalent bonding is referred to as “sharing” electrons. Is it really sharing? Why or why not?
Answer:
yes
Explanation:
because they will bond in order to gain more stability which is gained by forming a full electron shell
2. Which atom is larger, Na or Al? Explain why.
Answer:
Na
Explanation:
Because it has the highest protons and electrons(Atomic mass)
What would be the pH after mixing!!
during chemical reaction do atoms change into a new substance
true or false
Answer:
t
Explanation:
because for atoms to change they have to have some kind of chemical action to get new life
5. an atom that has lost or gained an electron and has become charged
A.ion
B. proton
C. ionic bond
D. compound
Answer:
It would be compound.
Explanation:
It is this way because if it adds another proton it becomes more positive that nuetral, and if you add an electron it just makes the atom more dense. That is why the answer is compound. Hope this helped :)
sexual reproduction helps to increase
a. the number of offspring
b. genetic variation
c. genetic mutations
Answer:
a. the number of offspring would be ur answer pls make me brainliest
A chemical equation is balanced if there are ______ ______ of each kind of ______________________ on both sides of the equation.
If each side of the equation has the same number of atoms of a given element, that element is balanced. If all elements are balanced, the equation is balanced. So your sentence should look like this:
A chemical equation is balanced if there are equal atoms of each kind of element on both sides of the equation.
what are the 3 subatomic particles of the atom? What are their corresponding charges and locations within the atom?
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom.
Explanation:
the negatively charged electrons can be found around the nucleus in an electron cloud.
TIME REMAINING
58:36
The electron configuration for Helium (He) is shown below.
1s2
Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?
Answer:
'*:*'
Explanation:
I know this looks weird, but
'= electron
*:* equals the nucleus, so 2 protons and 2 neutrons
and then '=electron
The main goal of science is to
Answer:
The goal of science is to learn how nature works by observing the natural and physical world, and to understand this world through research and experimentation.
Explanation:
Math and science skills
Please answer
1.
|Predict|
2.
|Use variables|
3.
|Plan and conduct investigations|
4.
Draw conclusions
5.
Hypothesize
6.
Measure
7.
Classify and order
8.
Record and display data
9.
|Use time and space relationships|
10.
Use numbers
Answer:6
Explanation:
The maximum amount of statie friction between this chair
and the floor is 175 N.
Which action would cause the chair to move to the left?
A. Applying 100 N of force to the chair from the left
B. Applying 200 N of force to the chair from the left
O c. Applying 200 N of force to the chair from the right
O D. Applying 100 N of force to the chair from the right
Answer:
C
Explanation:
A p ex
Select the correct answer from each drop-down menu.
Why do some transition metals have multiple oxidation states?
Transition metals have multiple oxidation states because of their (a. completely filled b. partially filled c. empty) (s, p, d, or f) sublevel.
Answer:
because of energy difference between (n1)d and ns orbitals (sub levels) and involvement of both orbital in bond formation
Explaination:
the reason is that there is a difference in energy of orbitals of an atom of transition metal, so there (n1)d orbitals and there ns orbitals both make a bond and for this purpose they lose an electron that is why both sublevels shows different oxidation state.
Hope this helped you
Transition metals have multiple oxidation states because of their partially filled orbitals . Thus option b is correct.
What are transition metals?Transition metals are defined as essentially, a configuration attended by reactants during complex formation, as well as the reaction coordinates.
It can also be defined as a very short-lived atomic configuration at a reaction-energy diagram's local energy maximum.
Transition metals are best defined as an element with a partially filled d sub-shell on its atom or that can give rise to cations with an incomplete d sub-shell.
Transition state is defined as a chemical reaction is defined as a certain configuration along the reaction coordinate.
Oxidation state is defined as the total number of electrons that have been deleted or added to an element.
It can also be defined as an atom's charge if all of its links to other atoms were entirely ionic.
Thus, transition metals have multiple oxidation states because of their partially filled orbitals . Thus option b is correct.
To learn more about transition metals, refer to the link below:
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4. Which elements would have similar properties to potassium?
A. Lithium and Sodium
B. Bromine and Krypton
C. Calcium and Scandium
D. Cobalt and Rhodium
Answer:
The answer is A. Lithium and Sodium
A student found the mass of a brick: 50 grams. The volume was 10 cubic centimeters. If the student had 5 bricks, what would be the total density?
Answer:
The answer is 5 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
The mass of one brick is 50 g
the volume of one brick is 10 cm³
Since the student had 5 bricks
Total mass = 5 × 50 = 250 g
total volume = 5 × 10 = 50 cm³
So the total density is
[tex]density = \frac{250}{50} = \frac{25}{5} \\ [/tex]
We have the final answer as
5 g/cm³Hope this helps you
A hypothesis is ______ to explain a set of observations.
1 one possible way
2 the correct method
3 a factual statement
4 a set of data
Answer:
1
Explanation:
one possible way its just a theory of what the answer could be
Answer:
3-a factual statement
Explanation:
A hypothesis is a factual statement to explain a set of observations.
3.Zinc has an atomic number of 30 and a mass number of 65, how many neutrons does it have?
30
65
35
95
Answer:
35
Explanation:
Given parameters:
Atomic number of zinc = 30
Mass number of zinc = 65
Unknown
Number of neutrons = ?
Solution:
The mass number of an atom is the sum of its protons and neutrons;
Mass number = Protons + neutrons
Atomic number is the number of protons in an atom;
Atomic number = Protons
So;
Mass number = Atomic number + Neutrons
Neutrons = Mass number - Atomic number
Neutrons = 65 - 30 = 35
The number of neutrons in the atom is 35
This chart shows characteristics of three different types of atoms.
A 3-column table with one row titled valence electrons in three types of atoms. The first column labeled Atom X has entry 6 valence electrons. The second column labeled Atom Y has entry 2 valence electrons. The third column labeled Atom Z has entry 8 valence electrons.
Which statement is best supported by the information in the chart?
Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.
Answer is Atom X will accept electrons from Atom Y.
Atom X will accept electrons from Atom Y.
What is Chart?
The official 511 traveller information service for Maryland is CHART Web. Maryland 511 gives drivers dependable, up-to-date information about traffic, road closures, and weather-related traffic events and conditions.
When driving in Maryland, MD 511 assists drivers in getting to their destination in the safest and most effective way possible.
The term "chart" (sometimes referred to as "graph") refers to a graphical representation of data visualization in which "the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart".
Therefore, Atom X will accept electrons from Atom Y.
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in a hydraulic lift system, the output force is greater than the input force because
Answer:
In a hydraulic lift system, the output force is greater than the input force because the pressure acting on the output piston is greater than the pressure acting on the input piston.
Explanation:
Which characteristic of a substance is considered a chemical property?
its boiling point
its reactivity
its density
its conductivity
Answer:
Reactivity
Explanation:
a chemical reacting to another chemical is considered a Chemical property because chemicals react with other chemicals differently. Pls PLs give me brainliest
Answer:
reactivity
Explanation: