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2 years ago

Which of the following statements is true?

Chemistry

2 answers:

german2 years ago

8 0

Answer: Solids have a fixed mass, volume, and shape.

Explanation: Solids are the substances which have fixed shape, fixed volume and mass due to its close packed structure.

Dalton explained that all the elements are made up of small indivisible particle known as Atoms but after some time this was proved wrong as atoms is not indivisble, it conatins sub atomic particle like electrons, protons, neutrons etc.

Plasmas are considered as the fourth state of matter which contains equal quantity of positive ions and negative electrons.

The number of protons are equal to the number of electrons. The sum of number of protons and neutrons make the atomic mass quantity.

Alexandra [31]2 years ago

4 0

Solids have a mixed mass, volume, and shape.

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You've made the hypothesis that the higher the density of a rock, the higher the temperature at which will melt, because a dense

Vlad [161]

The independent variable is the one we are changing in the experiment. As we change it, the dependent variable might also change.

C. the density of the rock because we are changing the density of the rock and seeing how all other variables change with regards to the density.

7 0

3 years ago

Read 2 more answers

CH4 + O2 → CO2 + H2O

Scilla [17]

Answer:

9.8 × 10²⁴ molecules H₂O

General Formulas and Concepts:

Atomic Structure

Reading a Periodic Table
Moles
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Organic

Naming carbons

Stoichiometry

Analyzing reaction rxn
Using Dimensional Analysis

Explanation:

Step 1: Define

[RxN - Unbalanced] CH₄ + O₂ → CO₂ + H₂O

[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O

[Given] 130 g CH₄

Step 2: Identify Conversions

Avogadro's Number

[RxN] 1 mol CH₄ → 2 mol H₂O

[PT] Molar Mass of C: 12.01 g/mol

[PT] Molar Mass of H: 1.01 g/mol

Molar Mass of CH₄: 12.01 + 4(1.01) = 16.05 g/mol

Step 3: Stoichiometry

[DA] Set up conversion: $\displaystyle 130 \ g \ CH_4(\frac{1 \ mol \ CH_4}{16.05 \ g \ CH_4})(\frac{2 \ mol \ H_2O}{1 \ mol \ CH_4})(\frac{6.022 \cdot 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O})$
[DA] Divide/Multiply [Cancel out units]: $\displaystyle 9.75526 \cdot 10^{24} \ molecules \ H_2O$

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

9.75526 × 10²⁴ molecules H₂O ≈ 9.8 × 10²⁴ molecules H₂O

8 0

2 years ago

What is physical weathering? (1 point)

steposvetlana [31]

Answer:

well physical weathering is the process of a element or acts of water rock or other items that take its toll on items

Explanation:

so i would,WITH CONFIDENCE C.

5 0

2 years ago

Read 2 more answers

The chemical formula for oxygen difluoride is O2F true or false?

Dahasolnce [82]

Answer:

false

Explanation:

5 0

3 years ago

Read 2 more answers

The experimental group is the group that is left alone during the experiment

Paladinen [302]

Answer:

The given statement is false.

Explanation:

A common method of experimentation that is used to collect data on hypotheses of end up causing-effect is a contrast between two groups.
One community, the experimental group, is receiving medication for having any result. Some other group becomes left exposed, the control group, whether creating a different treatment.

4 0

3 years ago