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natka813 [3]
3 years ago
10

Question 1 of 7

Chemistry
2 answers:
Nata [24]3 years ago
8 0

Answer:

b

Explanation:

nlexa [21]3 years ago
3 0

Answer:

Explanation:B ice melting is a phiyscal change and the mass of the substance remains the same

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The energy of a gamma ray photon whose frequency is 5.02 x 1020 Hz?
vichka [17]

Answer:

The energy of photon is 33.28×10⁻¹⁴  J

Explanation:

Given data:

Frequency of photon = 5.02×10²⁰ Hz

Energy of photon = ?

Solution:

E = h.f

h = planc'ks constant = 6.63×10⁻³⁴ Js

by putting values,

E =  6.63×10⁻³⁴ Js × 5.02×10²⁰ Hz

        Hz = s⁻¹

E = 33.28×10⁻¹⁴  J

The energy of photon is 33.28×10⁻¹⁴  J.

4 0
3 years ago
Ms. Block's students are studying chemical reactions as well as the law of conservation of matter. A classic reaction occurs whe
goblinko [34]

The answer is; C

Conservation of matter in a reaction means that the mass of matter in the products is equal to the mass of the reactants. Energy/matter cannot be created or destroyed but converted from one form to another.

An expanding balloon with the increased evolution of gas is a good visible practical sign in the experiment on the conservation of matter in the reaction. As the magnesium disappears with an increased input of hydrochloric acid, the balloon gets bigger showing that more hydrogen is evolved from the reaction;

2HCL + Mg  MgCl2 + H2  


4 0
3 years ago
Read 2 more answers
In micelles: Question options: A) non-polar ends form hydrophilic interactions with water. B) polar ends form hydrophobic intera
AnnyKZ [126]

Answer:

E

Explanation:

A miscelle has a an ionic head which is hydrophillic and interacts effectively with water, helping the miscelle to dissolve. The tail is hydrophobic, it dissolve the grease or stain and removes it from the fabric. The hydrophobic tail extends outside the water, while the hydrophillic head extends into the water. This enables the cleansing action of soap

4 0
3 years ago
Where in your cells does cellular respiration occur?
Tamiku [17]

Answer:

Mitochondria

Explanation:

The enzymatic reactions of the cellular respiration begin in the cytoplasm, but most of the reactions occur in the mitochondria.

8 0
3 years ago
Read 2 more answers
Matter is anything that has mass and takes up space. Which units of measurement can you use to describe these two properties?
Sindrei [870]

Answer is: D. kilograms and cubic millimeters .

Kilogram (symbol: kg) is the base unit of mass (anything that has mass in this question) in the International System of Units and cubic millimeter (symbol: mm³) is volume measurement unit (takes up space).

Second (symbol: s) is the base unit of time in the International System of Units and kilometer (symbol: km) is a unit of length in the metric system.

Gram (symbol: g) is a metric system unit of mass, but millimeter (abbreviated: mm) is an unit of distance in the metric system.

Yard (abbreviation: yd) is an unit of length and liter (symbol: l) is metric unit of capacity.

5 0
4 years ago
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