what is molecular formula of silicon dioxide by criss cross method
Answer:
SiO2
Explanation:
4 2
Si \ / O
/ \
=>Si2O4
Cancelling 2 and 4
=>SiO2
Answer:
SiO2
Explanation:
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A certain atom has a nucleus containing six protons and eight neutrons and has six electrons orbiting the nucleus. This atom is a form of the element — ¡silicon ¡carbon ¡magnesium ¡calcium
Answer:
Carbon
Explanation:
The way to identify an element is by looking at the number of protons the atom has. Every element has its own atomic number. This atom has 6 protons. If you look at the periodic table, you can see that the atom with the atomic number of 6 is carbon.
As the atom has six protons in it's nucleus, the atom is a form of element of carbon.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Which is more important in a chemical formula, the symbol or the subscript or both?
Answer:
The symbol is more important in a chemical formula
Explanation:
Express in scientific notation.
1.24 x 10^6/
6.2 x 10^-3
Answer:
1.24*10^6=1.24*1000000=1240000
6.2*10^-3=6.2*0.001=0.0062
Explanation:
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If an ice cube has a mass of 25 grams and it melts, what would the mass of the liquid water be?
Answer:25grams
Explanation: the mass stays the same even when it changes form
If a reaction occurs and there were 10 g of Ca
reacting with 20 grams of water, and 5 grams of H2
was produced, how much Ca(OH)2 was produced?
Show your work.
Ca + H2O - Ca(OH)2 + H2
Answer:
18.52g
Explanation:
(relative atomic masses: H = 1.01, O = 16.00, Ca = 40.08)
Equation (balanced):
Ca + 2H2O -> Ca(OH)2 +H2
First, calculate the number of moles of 10g calcium
No. of moles of Ca = 10/40.08 = 0.25 mol
Then, calculate the number of moles of 20g water
No of moles of H2O = 1.11 mol
According to the balanced equation, 1 mole of calcium reacts with 2 moles of H2O completely. Therefore, H2O is in excess.
So, 1 mole of calcium reacts with water to form 1 mole of Ca(OH)2 (according to the mole ratio shown in the balanced equation)
Therefore, 0.25 mol of Ca(OH)2 is produced.
Mass of Ca(OH)2 produced = no. of moles x molar mass = 0.25 x (40.08 + 16 + 16 + 1.01 + 1.01) = 18.52g
Good luck!
is a freezing point a phusical or chemical property
Answer:
Both extensive and intensive properties are physical properties, which means they can be measured without changing the substance's chemical identity. For example, the freezing point of a substance is a physical property: when water freezes, it's still water (H2O)—it's just in a different physical state.
Explanation:
1. A rectangular block of aluminum metal has a mass of 2540 g. The block of
aluminum has dimensions equal to 9.4 cm, 8.7 cm and 11.5 cm. From the data
provided, what is the density of aluminum?
Answer:
Hey there!
Density=Mass/Volume
Volume: 9.4x8.7x11.5
Volume: 940.47 cm^3
Density of aluminum
2540/940.47, or 2.7 grams/cm^3
Let me know if this helps :)
Which event occurs during high tide? Al of Earth's ocean levels rise. The moon's orbit is closer to Earth The moon's gravity causes Earth's crust and water to bulge. Earth's crust and water are being pulled in opposite directions by the Sun and moon.
Answer: B. the moon's orbit is closer to the earth.
Explanation: I took the test
Answer:
B The moon’s orbit is closer to Earth.
Explanation:
I took the test on Edge :)
Which chemistry studies non carbon based structures?
O Biochemistry
Analytical Chemistry
O Inorganic Chemistry
Organic Chemistry
Answer:
Inorganic chemistry
Explanation:
Meaning: Inorganic chemistry studies substances that do not contain carbon; therefore, it studies non carbon based structure.
Answer:
Inorganic chemistry
Explanation:
Inorganic chemistry studies the chemical compounds in non-living things, things that do not contain carbon
Organic chemistry covers things that do contain carbon.
Bombardier beetles inject boiling hydrogen peroxide, or H2O2, into the victims. It then decomposes into hydrogen and oxygen gas. How many grams of oxygen can be produced if 0.128 grams of hydrogen peroxide are decomposed?
Answer:
0.12 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
H2O2 —> H2 + O2
Next, we shall determine the mass of H2O2 that decomposed and the mass of O2 produced from the balanced equation. This is illustrated below:
Molar mass of H2O2 = (2×1) + (16×2)
= 2 + 32
= 34 g/mol
Mass of H2O2 from the balanced equation = 1 × 34 = 34 g.
Molar mass of O2 = 16×2 = 32 g/mol
Mass of O2 from the balanced equation = 1 × 32 = 32 g
Summary:
From the balanced equation above,
34 g of H2O2 decomposed to produce 32 g of O2.
Finally, we shall determine the mass of O2 produced from the decomposition of 0.128 g of H2O2. This can be obtained as follow:
From the balanced equation above,
34 g of H2O2 decomposed to produce 32 g of O2.
Therefore, 0.128 g of H2O2 will decompose to produce = (0.128×32)/34 = 0.12 g of O2.
Therefore, 0.12 g of O2 was produced.
A car travels at a speed of 80.0 miles/hour. What
is the speed of the car in meters/second (m/s)?
Answer: 1.3
Explanation: 80 divided by 60 is 1.33333333333
In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. Which human illness did Spallanzani's work eventually shed light on? intestinal ulcers mouth ulcers stomach ulcers skin ulcers
Stomach ulcers, I've read it online and I take the test
In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. The human illness which Spallanzani's work eventually shed light on Stomach ulcers.
What is pH ?
pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14.
What is Gastric acid ?Gastric acid is also called gastric juice or stomach acid it is made up of water, enzymes, hydrochloric acid, electrolytes. The pH of gastric acid is between 1 and 3 that means it is acidic is nature.
Thus from the above conclusion we can say that In the 18th century, Italian biologist Lazzaro Spallanzani designed an experiment supporting the hypothesis that gastric juices are partly responsible for digesting food. The human illness which Spallanzani's work eventually shed light on Stomach ulcers.
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when plants and animals die and decay, they become? answers useless ,fertilizer ,harmless, bluish-black
Answer:fertilizer
Explanation:
Which of the following releases matter? A.engaging a car exhaust system B.picking up iron filings with a magnet C.turbines spinning in a power plant D.turning on an electric hot plate
Engaging a car exhaust system releases matter.
WHAT IS MATTER?
Matter is any substance that posseses weight and occupies an amount of space. Going by this definition, almost everything in our environment can be referred to as matter.Matter, in chemistry terms, can include elements, compounds, molecules, solids, gases etc. However, radiations, light emissions, heat cannot be regarded as matter.WHAT ACTIVITIES RELEASE MATTER?
According to this question, engaging a car exhaust system releases matter into the atmosphere in form of carbon monoxide (CO).N.B: Other activities like picking up iron filings with a magnet (magnetic field), turbines spinning in a power plant, and turning on an electric hot plate (heat) do not release matter.
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Allie rode her bike for 396 minutes. How many hours did she ride?
A block of aluminium occupies a volume of 11.1 mL and weighs 43 g. What is it's density? Give answer with one decimal.
Answer:
Density = 3.9 g/ mLExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass = 43 g
volume = 11.1 mL
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{43}{11.1} \\ = 3.873873...[/tex]
We have the final answer as
Density = 3.9 g/ mL to one decimal place
Hope this helps you
True or False ... In a chemical change, a new
substance is formed.
uestion 3 (1 point)
1. Calculate the density of a liquid that has mass of 14.0g and volume of 18.0 cm? Will this liquid float on
top of water or will it sink? (Density of water is 1.0 g/mL)
I
formula for density of liquid = mass ÷ vol
= 14.0 g ÷ 18.0 cm³
= 0.77778 g/cm³ ( 5sf)
= 0.778 g/cm³ ( 3sf )
18.0 cm³ is the same as 18.0 ml
Therefore, the liquid will float on water as the water is denser than the liquid.
18.0 cm³ is equivalent to 18.0 ml, in light of the fact that water is denser than liquid, the liquid will float on it.
What is the density of a liquid?Density is defined as d = M/V, where M stands for mass and V for volume. The unit of density that is most frequently used is grams per cubic centimeter.
The formula for liquid density is mass divided by volume.
= 14.0 g ÷ 18.0 cm³
= 0.77778 g/cm³
= 0.778 g/cm³
The same procedure used to determine a solid's density is used to determine a liquid's density. Calculate the fluid's mass, then its volume, then divide mass by volume.
To determine the fluid's mass, weigh the fluid in the container, pour it out, weigh the empty container, and then subtract the empty container's mass from the mass of the filled container.
Therefore, in light of the fact that water is denser than liquid, the liquid will float on it.
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Rank the nonmetals in each set from most reactive (1) to least reactive (3).
Neon:
Selenium:
Fluorine:
Answer:
Neon: 3
Selenium: 2
Fluorine: 1
Explanation: The periodic trend of reactivity depends on whether the elements are metals or nonmetals.
Answer:
Neon:
3
Selenium:
2
Fluorine:
1
Explanation:
Just got them correct on Edge.
BRAIBLIEST BRAINLIEST BRAINLIEST BRAINLIEST BRAINLIEST BRAINLIEST BRAINLIEST BRAINLIEST BRAINLIEST BRAINLIEST
please answer quickly thank you
Answer:
13
Explanation:
Answer:
it is 13
Explanation:
Isabella wants to determine the mass of a metal block what is the SI unit for mass
Answer:
Kilogarm
Explanation:
Just took a test on this!
How fast can wind speeds get inside a tornado?
Answer:
Over 200 mph
Explanation:
I took the k12 quiz and looked at a weather website and it said tht was the answer
What is the mass of a 500.00 mL sample of seawater with a density of 1.025 g/mL?
Answer:
Mass of seawater = 512.5 gram
Explanation:
Given:
Volume of seawater = 500 ml
Density of seawater = 1.025 g/ml
Find:
Mass of seawater
Computation:
Mass of seawater = Volume of seawater × Density of seawater
Mass of seawater = 500 × 1.025
Mass of seawater = 512.5 gram
The scientific method is "flexible". What does that mean? Why is that
important and necessary?
Answer:
we can reach the same conclusions by applying different experimental and observational procedures
Explanation:
The scientific method is a process that can be summarized in the following steps: 1-to raise a question, 2-to make a hypothesis, 3-to obtain data from observations and/or experiments, and finally, 4-to obtain conclusions that enable to confirm (or reject) the hypothesis. The scientific method is flexible because it is not necessary to follow 'stringent' guidelines in order to reach the same conclusions. In consequence, the predictions derived from such results can be tested again to determine the veracity of the results.
What must happen for a natural resource to become a synthetic material?(1 point) It needs to go through a chemical reaction. It needs to be pounded very thin. It needs to be dried out. It needs to go through a phase change.
Answer:
It needs to go through a chemical reaction
Explanation:
Natural resources undergoes chemical reaction to become synthetic materials.
Natural material undergoes several chemical changes to chnage the characterstics of the resources into synthetic material.
Some examples of synthetic materials are medicines, plastics, and new fuels which are extracted from trees or plants, natural fibers, and petroleum.
Hence, the correct option is "It needs to go through a chemical reaction".
Answer:
It needs to go through a chemical reaction.
How you could use the scientific method to learn whether water really does take longer to boil if you are watching it.
Answer:
What you need is a thermometer and a clock.
Explanation:
Which question cannot be answered by science? (4 points)
a
Why do rainbows appear after rain storms?
b
Which plants grow in the desert?
c
Why should endangered animals be protected?
d
What is the hardest element on Earth?
Answer:
C
Explanation:
The option C question has not a specific answer related to pure science.
The question cannot be answered by science is Why should endangered animals be protected? . Option C is correct.
What are endangered animals?An endangered species or the animals or plants which are at the risk of the extinction is a type of organism or animal or plant that is threatened by extinction.
Species of some animals and plants become endangered for two main reasons first one is loss of habitat or living due to destruction of forest and loss of genetic variation due to some evolution. An species is a type of organism or plant or animal that is threatened by extinction.
Therefore, question cannot be answered by science is Why should endangered animals be protected? . Option C is correct.
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The public is not yet able to purchase cars powered by hydrogen fuel cells because engineers have to determine how the cars perform based on which scenario? on racetracks in real-world conditions in flooded environments on closed courses
A(on racetracks
B(in real-world conditions
C(in flooded environments
D(on closed courses
Answer:
It’s B just did it
Explanation:
Answer:
B.
Explanation: i just tookthe quiz ya welcome.
Look at the four chemical reactions. Reaction 1: 2H2 + O2 → 2H2O Reaction 2: 2NaCl → 2Na + Cl2 Reaction 3: CaO + H2O → Ca(OH)2 Reaction 4: 4Fe + 3O2 → 2Fe2O3 Which statement identifies the reaction that is different from the rest and explains correctly why it is different? (1 point) Reaction 2, because a single reactant is decomposed Reaction 1, because two reactants have decomposed Reaction 2, because a single ion is replaced in a compound Reaction 1, because two ions have interchanged their positions
Answer:
Reaction 2, because a single reactant is decomposed
Explanation:
It's the only one where the product was decomposed while the others became one. I took the quiz and it was correct.