Answer:
picture?
Explanation:
which statement describes redis experiment which helped disprove spontaneous generation?
Answer:
it is A i just got it right
Explanation:
Potassium, K, had 19 protons, 20 protons, 19 electrons. What is the charge of the atom’s nucleus.
HELP
Answer:
+ 19
Explanation:
The following data were obtained from the question:
Proton = 19
Neutron = 20
Electron = 19
Charge on nucleus =.?
From a background understanding of the structure of an atom, the nucleus of an atom contains protons and neutrons with the proton being positively charged and the neutron is neutral while the electrons being negatively charged revolve around the nucleus.
From the above question, we understood that the potassium atom has 19 protons which are all positively charged. This simply means that the nucleus has a charge of + 19 since the neutrons are neutral.
HELPPPP!
can we manufacture water? why or why not
Answer:
No because water needs to have no salt
Explanation:
All elements on the periodic table are________
Answer:
Explanation:
arranged in order of increasing.
how many bonds are broken in 2O2
Answer:
c5mvmifvidvj8dvj9r kf9,g
What is the mass of an atom with 7 protons, and 7 neutrons?
Answer:
Explanation:
Nitrogen has an atomic number of 7 (Z=7) because it has 7 protons in its nucleus. Some nitrogen atoms have an atomic mass number of 15 (A=15). A is the number of neutrons plus protons in the nucleus. However, we already know that there are 7 protons.
plz mark as brainliest
What is density????????????????
Answer:
Density is the mass per unit volume
Explanation:
Density is defined as mass divided by volume: where "p" is the density, "m" is the mass, and "V" is the volume.
HELP PLEASE!!
Calculate the mass in grams of an object whose volume is 67.8 mL and whose density is 7.25 g/mL
Answer:
The mass of the object would be 491.55g/mL. Hope this helped! :)
Explanation:
D= 7.25g/mL M=D•V
V= 67.8mL
M=7.25g/mL•67.8mL
M= 491.55g
Ex of physical Properties
describe the trend in viscosity of hydrocarbon fuels
Answer:
Hydrocarbons are the chemical compound that contain the elements carbon and hydrogen only.
They are compounds that are obtained from the fossil fuel crude oil by a process called fractional distillation.
How does a scientist test their hypothesis?
Answer:
Conducting experiments and using the scientific method.
Explanation:
Scientists (and other people) test hypotheses by conducting experiments. The purpose of an experiment is to determine whether observations of the real world agree with or conflict with the predictions derived from a hypothesis. If they agree, confidence in the hypothesis increases; otherwise, it decreases.
Explain how NOTHING is ZERO, but ZERO is more than NOTHING?
Answer:
Nothing can be zero, but zero isn't nothing. If someone asks you if you have money and you say "I've got nothing!" when you actually don't have a cent, then you have zero money. However, zero is a number, so it itself is something, therefore more than nothing. So technically, you do have something.
When zero is on a number line, you could classify it as nothing, but it is the number between 1 and -1. Hypothetically speaking, if you took the zero away, wouldn't the number line be the same?
Zero isn't positive or negative. The number zero on a graph, or in a coordinate can tell you where something is. Zero can be a word to describe if something is existent, or non-existent.
Okay, my brain hurts.
Which of the following is a single replacement reaction?
( a. Ba(OH)2 + H2SO4 → BaSO4 + 2H2O
( b. 2Mg + O2 → 2MgO
(c. H2O+ CO2 → H2CO3
(d. Zn + H2SO4 → ZnSO4 + H2
Answer:
D.
Explanation:
A. is double replacement. Ex. AX + BY -> AY + BX
B. is synthesis Ex. A + B -> AB
C. is synthesis
D. is Single replacement -> A + BX -> Ax + B
- Study definitions and examples of these and that will help.
When zinc react with sulfuric acid, then zinc sulphate is formed. Zn + H₂SO₄ → ZnSO₄ + H₂ this reaction is replacement reaction.
What is replacement reaction ?One element in a molecule is replaced by another in a chemical reaction known as a single-displacement reaction, sometimes referred to as a single replacement reaction or exchange reaction.
One element in a compound is switched out for another in a single replacement reaction. In a double-replacement process, the anions or cations of two ionic compounds are switched. In a double-replacement reaction known as a precipitation, a solid precipitate is one of the products.
One ingredient replaces another comparable element in a compound in a single-replacement reaction.
Thus, option D is correct.
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Look at the picture. Assume that all of these substances are in different containers. In all of
these substances, atoms have combined to form
ions
elements
molecules
mixtures
Answer:
Elements?
Explanation:
Im not sure but I think its elements because carbon dioxide is, and the others sound like it too
When salt is placed on ice the ice melts. explain why?
Explanation:
When salt is added to ice, salt first dissolves in the film of liquid water that is always present on the surface, thereby lowering the ice's freezing point
please mark as brainliest ,I really need it
To get a 4 suggest a way to improve the accuracy or precision of the finding
.
25 PTS!
11. The metric prefix for 1/1000 is:
a) centi
b) milli
c) micro
d) kilo
You are measuring the effects of salt on water's ability to freeze. To one of your water samples, you add sodium chloride (NaCl, or salt). In this solution, which part is the solvent?
Question 8 options:
Water
NaCl
Both
Neither
Answer:
water
water is the worlds best solvent cause it can melt many different things also it is called the "Universal Solvent"
Using the periodic table, complete the table to describe each atom. Type in your answers
A
B
C
D
E
F
Answer:
A. 20 B.40 C. Ca D. 10 E. 9 F. F
Explanation:
Answer:
A.) 20
B.) 40
C.) Ca
D.) 10
E.) 9
F.) F
Explanation:
just did it on edge 2020 & got it correct....
why do atoms combine
Explanation:
Atoms form chemical bonds with other atoms when there's an electrostatic attraction between them. This attraction results from the properties and characteristics of the atoms' outermost electrons, which are known as valence electrons.
In the reaction BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq), what phases are the reactants in before the reaction?
Question 4 options:
A)
BaCl2 is a liquid, and Na2SO4 is a gas.
B)
BaCl2 is a solid, and Na2SO4 is in aqueous solution.
C)
Both reactants are gases.
D)
Both reactants are in aqueous solution.
Answer:
D. both are stated to be in aqueous solutions by the (aq)
Explanation:
I really need help with this before 5:10
Show your work
Your big brother has been brageing about how he can bench press 4.000 grams at the gym. Sounds impressive.
but you know better. Use your skills to find how many pounds of weight he is actually pressing.
( I got you fam. )
Answer ( assuming that your brother is doing 4,000 grams and not 4 grams ) :
around 8 pound's
Explanation:
1 gram = around 0.002 gram's
4,000 x 0.002 = 8
8 pound's :-)
What is the term for a ratio of equivalent measurements that can be used to change a value from one until into another
Answer:conversion factor
Explanation:
how do I solve for V1 in this equation
Answer:
[tex]V_{1} = \frac{P_{2}V_{2}T_{1}}{P_{1}T_{2}}[/tex]Explanation:
[tex]\frac{P_{1} V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]
First of all cross multiply
That's
[tex]P_{1}V_{1}T_{2} = P_{2}V_{2}T_{1}[/tex]
Next divide both sides by [tex]P_{1}T_{2}[/tex] in order to isolate [tex]V_{1}[/tex]
We have
[tex]\frac{P_{1}V_{1}T_{2}}{P_{1}T_{2}} = \frac{P_{2}V_{2}T_{1}}{P_{1}T_{2}}[/tex]
We have the final answer as
[tex]V_{1} = \frac{P_{2}V_{2}T_{1}}{P_{1}T_{2}}[/tex]
Hope this helps you
Question 8 Multiple Choice Worth 1 points)
(01 03 LC)
How is volume calculated given mass and density?
Sum of mass and density
O Mass divided by density
Mass multiplied by density
O Difference of mass and density
A what is the answer and
Anwser theses questions please (extra points!)
Rank the nonmetals in each set from most reactive (1) to least reactive (3). bromine chlorine iodine
Answer:
1. Chlorine 2. Bromine 3. Iodine
Explanation:
Answer:
Bromine: 2 Chlorine: 1 Iodine: 3
Explanation:
What is the mass of 42.0 mL of a liquid with a density of 1.65 g/mL?
Answer:
The answer is
69.30 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 42 mL
density = 1.65 g/mL
The mass is
mass = 1.65 × 42
We have the final answer as
69.3 gHope this helps you
pls help!! What volume is represented by each small tick mark? (look at attachment)
The mark represents a volume of 25ml.
What is a measuring cylinder?A Measuring cylinder, a graduated cylinder, a cylinder measuring, or a mixing cylinder is a part of various laboratory materials that are used for the measurement of the volume of liquids, chemicals, or solutions during laboratory work.
Graduated cylinders have more precise and accurate measurements than the common volumetric flasks and beakers used in the laboratory. These are of various volumes ranging from small to big.
These graduated cylinders are also used for the determination of displacement. It is a measurement of the change in a volume of water when some additional materials are added to it.
This means that a graduated cylinder can be used for the determination of solid materials by taking the difference between the initial volume of water and the new volume of water.
Therefore, in this case, the mark represents a volume of 25ml.
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What volume is equivalent to 14,000 mm cubed
Answer:
14mL
Explanation:
1mL = 1cm^3, 1000mm^3 = 1000cm^3